Almost every enquiry we receive for a Titan Micro part contains a second question. It is not “do you have TM1637 in stock” but “do you have TM1637, or something that does the same job”. The buyer is under production pressure, and the replacement question decides whether the line stops or keeps running.
This guide is for the person who has to answer that question in writing: a sourcing manager comparing quotations, a procurement engineer told to find a second source, or a design engineer asked to approve a substitute before a purchase order is raised. It covers what actually replaces what in the Titan Micro display driver range, where a substitution is safe, and the specific places where a swap passes incoming inspection and then fails three months into production.
Why buyers search for a Titan Micro IC alternative
There are four distinct reasons a buyer ends up on this page, and they need different answers. Treating them as one problem is how a wrong part gets ordered.
- Supply interruption. The distributor who supplied the last three reels no longer has stock, or has moved to a different line. The question is availability, not technology. The answer is usually another package of the same device, or the same device from a different stock position.
- Price pressure. The current unit price no longer fits the BOM after a cost-down review. The buyer wants a lower price at the same performance, and is open to a functionally equivalent part.
- Design mismatch. The original part was specified before the MCU rail changed to 3.3 V, or before someone added buttons to the front panel. Here the “alternative” is a correction, not a compromise — and forcing the original part is the expensive choice.
- Obsolete or hard-to-buy line. The design was built around a part that no longer comes through normal channels consistently. The buyer needs a stable replacement for a product that will stay in production for several more years.
Only the third and fourth cases normally justify changing the part number on the BOM. The first two are almost always solved inside the existing design, which is cheaper, faster and carries no firmware risk. We say that to buyers directly, because a supplier who suggests a substitution for every availability problem is optimising for their own invoice, not the buyer’s programme.
Two kinds of alternative: which one you actually need
The word “alternative” hides two different exercises. Getting them mixed up is the single most common cause of a wrong order in this product family.
| What you are asking | What it means technically | What it costs you |
|---|---|---|
| “I need this model, but from a supplier who has stock.” | Same part number, same package. Supply question only. | Nothing. No design or firmware change. This is the case we resolve most often. |
| “I need a different Titan Micro part that does this job.” | Same-brand functional alternative — e.g. moving display-plus-keys duty from TM1637 to TM1650. | A PCB revision. Firmware changes because the register set changes. |
| “I need to replace a non-Titan part in my BOM with a Titan Micro part.” | Cross-brand substitution — e.g. an HT or MAX part replaced by the TM equivalent. | Protocol and driver rewrite. Package change. Full re-validation. |
| “I need something pin-for-pin identical that I can drop in today.” | A true drop-in. This exists only within a deliberately pin-compatible pair, and must be verified against the current datasheet revision. | Little or nothing — but only after the pinout is checked in writing. |
If your answer is in row one, you do not need a replacement guide at all. Send us the part number, the package and the quantity, and we will confirm stock. Everything below is for rows two, three and four.
Product overview: the Titan Micro display driver range
Newfly Electronics supplies the Titan Micro (天微电子) display driver portfolio across three functional families. Understanding the family split comes before any substitution decision, because a part from the wrong family cannot be made to work by changing a resistor.
- LED segment drivers — TM1637, TM1640, TM1650, TM1616, TM1668, TM1628, TM1638. These drive multiplexed LED segment and dot displays. Some include key-scan inputs; some are display-only.
- LCD segment drivers — TM1621B, TM1621C, TM1621D. These drive LCD glass with RAM-mapped output. They are not interchangeable with anything in the LED family at any voltage or in any package.
- Specialty series — TM1804, TM1812, TM1814, the TM512 series and TM7711. These are addressable LED drivers and data-converter parts, not display segment drivers, and they are outside the scope of this guide. Confirm the current datasheet revision with us before committing a PCB to one of them.
The practical point: the most frequent mis-order in this portfolio is an LCD driver bought to drive an LED display, or the reverse. Both parts are 28-pin plastic packages, both are sold as “display drivers”, and neither will do the other’s job.
Each model in the two display families has its own sourcing page here, with package options, stock position and pricing on request: TM1637, TM1640, TM1650, TM1628, TM1621B, TM1638, TM1668 and TM1616. For buyers who do not yet know which model they need, start with the LED driver IC selection guide instead of this page.
Technical specifications: replacement candidate reference
The table below is the reference we use internally when a buyer asks what can replace what. Use it as a filter, not as a datasheet. Where a figure depends on the current datasheet revision, we say so rather than print a number you cannot rely on.
| Model | Function | Display capacity | Interface | Key scan | Voltage | Package |
|---|---|---|---|---|---|---|
| TM1637 | LED display driver | 6 digits × 8 segments | 2-wire serial | Yes — small key matrix | 5 V | SOP20 / DIP20 |
| TM1640 | LED display driver | 16 digits × 8 segments (128 dots) | 2-wire serial | No | 5 V | SOP28 / SSOP28 |
| TM1650 | LED display driver | 4 digits (8-seg or 7-seg) | 2-wire serial | Yes — key matrix | 2.8–5.5 V | SOP16 / DIP16 |
| TM1616 | LED display driver | Compact segmented display | 2-wire serial | No | 2.8–5.5 V | SOP16 / DIP16 |
| TM1668 | LED display driver | Compact segmented display | 3-wire serial | Yes | 3.3–5.5 V | SOP24 / SSOP24 |
| TM1628 | LED display driver | 10-seg × 7-bit to 13-seg × 4-bit | 3-wire serial | Yes — 10 × 2 | 5 V | SOP28 |
| TM1638 | LED display driver | 8 digits × 10 segments | 3-wire serial | Yes — 24 keys | 5 V | SOP28 |
| TM1621B | LCD segment driver | RAM-mapped segment/common output | 4-wire serial | No | Confirm current revision | SSOP48 / LQFP44 |
| TM1621C | LCD segment driver | RAM-mapped segment/common output | 4-wire serial | No | Confirm current revision | SOP28 |
| TM1621D | LCD segment driver | RAM-mapped segment/common output | 4-wire serial | No | Confirm current revision | QSOP24 |
Voltage windows, drive current and multiplex ratios should be re-confirmed against the current Titan Micro datasheet revision before a design freeze. We send the datasheet revision with every quotation so that your approval is based on the document you will actually build to, not on a second-hand summary.
Applications: where the replacement decision is actually made
Substitution requests cluster around a small number of end products. Knowing which one applies to you tells us which constraints matter before you send an enquiry.
- Small appliance front panels — induction cookers, rice cookers, microwave ovens, water heaters. Typically 4 to 8 digits plus 3 to 8 buttons, so the decision point is key-scan count and panel depth rather than raw display size. Buyers in Vietnam, Thailand and Malaysia working on local-brand appliances hit this case most often.
- White goods control panels — washing machines and air conditioners. Larger digit counts and a ten-key matrix on a 5 V rail. This is where TM1628 and TM1638 sit, and where a substitution to a smaller part fails on key count rather than on display.
- Digital clocks, timers and counters — the classic four-digit, 5 V, no-key application. TM1637 and TM1616 both fit; the board footprint decides between them.
- Energy meters and thermostats — LCD glass, long product life. TM1621B, TM1621C and TM1621D are the only family that applies. Buyers in India running meter programmes ask for these more than for any other part, and the question is almost always package, not function.
- Instrument panels, LED dot matrix and prototyping boards — measurement equipment, controller front panels, 8 × 8 matrices, and Arduino-class development boards. Two limits dominate here: TM1640’s 128-dot ceiling per device, and on development boards the availability of a working driver library, which matters more than the datasheet.
The replacement map: which part covers which job
Work down this list until one line matches your design. The right-hand column is the only answer that matters.
| Your requirement | Primary Titan Micro part | Alternative to consider | What decides between them |
|---|---|---|---|
| 4 to 6 digits, 5 V rail, buttons on the panel | TM1637 | TM1650 | Rail voltage and pin count. TM1650 runs 2.8–5.5 V in SOP16 but drives fewer digits. |
| 4 digits, 3.3 V or a 5 V rail that may move to 3.3 V | TM1650 | TM1616 | Buttons. TM1616 is display-only; if the panel has keys it cannot be used. |
| 4 digits, display only, tight board space | TM1616 | TM1650 | SOP16 either way. Choose TM1616 for the leaner part, TM1650 if keys may be added later. |
| Dot matrix or a long 16-digit display | TM1640 | None in this family | Nothing else in the range reaches 128 dots, and TM1640 has no key scan. |
| Compact 3-wire panel with display and keys | TM1668 | TM1628 | Digit count and package. TM1668 is SOP24; TM1628 is SOP28 with more drive capacity. |
| Appliance panel, 10-key matrix, larger digit count | TM1628 | TM1638 | Key count and scan matrix. TM1638 supports more keys; TM1628 supports more segment combinations. |
| LCD glass, meters and thermostats | TM1621B | TM1621C / TM1621D | Package only. SSOP48 / LQFP44, or the narrower SOP28 and QSOP24 versions. |
For the same-brand pairs, four detailed comparisons cover the decision in full: TM1637 vs TM1650, TM1616 vs TM1650, TM1668 vs TM1628 and TM1637 vs TM1638 vs TM1650. If your decision sits in the appliance panel group — TM1628 against TM1638 — read TM1628 vs HT1628 as well, because the function classes in that pair are not identical and the comparison matters before substitution.
Cross-brand alternatives: TM against HT, MAX and equivalent series
A large share of substitution requests come from buyers whose existing BOM carries a non-Titan part and who want a second source. This is a different exercise from swapping within the Titan range, and it is worth being explicit about how we can help.
We supply the Titan Micro side of every pair below. We do not stock Holtek or Maxim product. What this page can do for you is help you decide whether a Titan Micro part can replace the part you already use, and what that substitution requires. If you need the Titan Micro part to be replaced by a part from another brand, we will tell you so plainly rather than quote something we cannot supply.
| Titan Micro part | Commonly compared part | Bus difference | What changes if you substitute |
|---|---|---|---|
| TM1637 | TM1650 (same brand) | Both 2-wire serial | Package changes from SOP20 to SOP16, and the rail window widens to 2.8–5.5 V. PCB revision and firmware revision both required. |
| TM1640 | MAX7219 | 2-wire serial against SPI | A protocol rewrite, and drive capacity per device changes. Not a drop-in in either direction. Re-design, not substitution. |
| TM1650 | HT16K33 | 2-wire serial against I²C | Different bus and different driver library. Common in hobby and prototype work, rarely justified in a production programme without a firmware budget. |
| TM1628 | HT1628 | Both 3-wire in the usual configuration | The two are frequently confused because both appear in appliance panels and the function classes are not identical. Verify pinout and function class in writing before committing. Our detailed comparison covers this pair. |
| TM1638 | MAX7219 plus a separate key-scan device | 3-wire serial against SPI | Architecture change: one device with integrated key scan against two devices. Board area and firmware both move. |
| TM1621B | HT1621B | 4-wire serial, both | The closest genuine replacement class in this portfolio. Pin-compatible operation, with firmware and driver revision check. This is the substitution most often done successfully. |
| TM1621C / TM1621D | HT1621B | 4-wire serial, both | Same function class in a different footprint — SOP28 or QSOP24 against the wider SSOP48 and LQFP44 bodies. Package-driven selection. |
| TM1668 | TM1628 | Both 3-wire serial | Internal alternative. SOP24 against SOP28, with a different drive capacity. Choose on digit count and board space. |
| TM1616 | TM1650 | Both 2-wire serial | Internal alternative. Display-only against display plus key scan, in the same 16-pin family. |
One number is worth remembering out of that table, because it is the one buyers get wrong: the same pin count does not mean the same pinout, and the same pinout does not mean the same protocol. TM1650 and TM1616 both sit in SOP16. TM1628, TM1638 and TM1621C all sit in SOP28 — and two of those are LED drivers while the third is an LCD driver. A substitution approved on package alone is a substitution approved on the wrong criterion.
Three of those pairs are analysed in detail elsewhere on this site, and they are worth reading before you commit to a cross-brand change: TM1621B vs HT1621B, TM1650 vs HT16K33 and TM1640 vs MAX7219. For the wider brand question, the Titan Micro vs HT series comparison covers both the LED and the LCD families side by side.
Titan Micro display driver substitution: where it does not belong
Specification tables tell you what a part can do. Design failures come from what it cannot do. Before you commit a Titan Micro display driver substitution to a production board, check these cases — if any of them applies to your design, this is the wrong part and we will say so.
- your MCU bus runs at 3.3 V and the candidate part is TM1637, TM1640, TM1628 or TM1638 — these are 5 V devices. Do not substitute one in as a level translator, and do not accept a level-shifting workaround to keep a cheaper part on the board. Use TM1650 or TM1616 (2.8–5.5 V), or TM1668 (3.3–5.5 V).
- your display is LCD glass and the candidate is any TM16xx LED driver — nothing in the LED family drives LCD glass, in any package, at any voltage. Only TM1621B, TM1621C and TM1621D apply. This is the most common mis-order in the range.
- you are approving the substitution on pin count alone — the same package size does not mean the same pinout. TM1650 and TM1616 both sit in SOP16; TM1628, TM1638 and TM1621C all sit in SOP28, and two of those are LED drivers while the third is an LCD driver. Ask for the pin assignment in writing.
- you need key scan and the candidate is TM1640 or TM1616 — both are display-only parts with no keyboard scan. This is the wrong substitute for the board. Move to TM1637, TM1650, TM1628, TM1638 or TM1668.
- you are replacing a Maxim, Holtek or other-brand part and expect the substitution to be firmware-compatible — the bus protocol and command structure differ. A protocol change is a firmware project, not a line change. Cost it as one before you sign the substitution off, and confirm the pin assignment in writing rather than assuming equivalence.
- you need a dot matrix larger than 128 dots on a single device — TM1640 tops out at 8 seg × 16 bit (128 dots). Beyond that, plan for multiple drivers on the bus rather than searching for a larger single part.
- you are substituting a specialty-series part (TM1804, TM1812, TM1814, TM512 series, TM7711) into a display-driver socket — these are not display segment drivers. Confirm the current datasheet revision with us before you commit a PCB — the addressing protocol and channel configuration are not interchangeable with the TM16xx display family.
- you need a like-for-like replacement for a part whose origin cannot be verified — we will not present an unverifiable lot as an equivalent substitute. If the only available stock has no traceable origin, that is a finding you need, not a substitution we can make.
Buying guide: how to evaluate a replacement before you commit
This sequence is the one we recommend to buyers, and it is the order in which a substitution should be signed off. Most failed substitutions skip step one or step two.
- Confirm the function family. LED segment driver, LCD segment driver, or dot matrix. A part from the wrong family cannot be substituted at any price. This single check eliminates the majority of wrong orders in this range.
- Confirm the package and, separately, the pinout. Ask for the pin assignment in writing, not the package name. Two devices in the same body can have a different pin map.
- Confirm the bus protocol. 2-wire, 3-wire and 4-wire serial parts use different command structures. A protocol change is a firmware project, not a line change, and it needs to be costed as one.
- Confirm the voltage window against your actual rail. A 5 V part on a 3.3 V bus is not a tuning problem. It is the wrong part. Do not accept a level-shifting workaround to keep a cheaper device in place unless the board has already been validated with it.
- Confirm key-scan capability. Display-only parts have no key-scan function. If the front panel has buttons, check the key matrix size against the device that will actually be fitted.
- Confirm drive capacity with headroom. Check digit and segment count against your display, not against the datasheet maximum. Boards that run at the limit of a device tend to show brightness variation in production.
- Get the datasheet revision for the exact part you are buying. Ask for it in writing, and note the revision on your approval. This is the single most effective protection against a substitution that drifts over time.
- Approve the replacement on samples from the same stock lot as production. A sample from a different lot proves nothing about the reel you will build from.
- Ask about second-order continuity. A replacement that is available this quarter and disappears next quarter has not solved the problem it was meant to solve.
- Ask for the date code and origin on the quotation. If it cannot be stated, that is the answer.
Steps one to nine are also the framework we apply to any supplier, not only to a part substitution. The supplier selection guide extends the same discipline to vendor vetting, and the Titan Micro sourcing guide covers the brand-specific version of the same problem.
Working with Newfly: the numbers
Buyers evaluating a supplier want the commercial parameters stated, not implied. Here is ours. Where a figure depends on your quantity, package or destination, we say so rather than publishing a number that will not hold.
| Item | What we commit to |
|---|---|
| Sample order | Sample and small-batch quantities are supported. Sample fee, freight terms and dispatch time are confirmed in writing with each quotation. |
| Minimum order | Flexible. We support partial-reel and small-batch quantities for first orders and scale with you. |
| Lead time | Confirmed in writing per order, against the quantity and destination you specify. |
| Inspection | Marking, packaging and date-code verification before dispatch. Tell us your acceptance criteria and we will align to them. |
| Defect claims | The defect resolution process is agreed in writing before the order, not after a problem appears. |
When we tell you not to buy
A supplier who accepts every enquiry without question is not screening anything. These are the situations where we will recommend against the purchase:
- The part you already use is in stock and validated, and you are substituting only to save a few cents per unit. The PCB revision, firmware change and re-validation cost more than the saving. We will say so rather than take the order.
- Your design needs a 5 V part on a 3.3 V bus and you have no level shifting. You do not need a cheaper substitute — you need TM1650 or TM1616. Substituting a different 5 V part does not fix the rail.
- You want a cross-reference part only available in the grey market, with no traceable origin and inconsistent date codes. We will describe the risk instead of quoting it as if it were normal stock.
- You are buying a full carton to hold speculative stock for a substitution that has not been validated on your own board yet. We will say so before you commit working capital.
- Your procurement rules require a franchised-channel paper trail that only the manufacturer’s own authorised channel can issue. We are an export distributor, not the franchised channel. If franchised traceability is mandatory for that line, we are not your supplier for it.
- Your target price can only be met with a lot we cannot verify as original Titan Micro product. We will decline the order rather than ship an unverifiable lot as a replacement.
Why buyers source Titan Micro parts from Newfly Electronics
Newfly Electronics is a China-based export distributor for Titan Micro (天微电子) display driver ICs. Titan Micro itself does not operate a dedicated foreign trade desk, and its quotations to offshore buyers are set at volume levels that most medium-sized programmes cannot reach. That gap is the reason this business exists.
What we actually offer, stated without adjectives:
- China supply chain pricing. We buy in the domestic market and export, so a buyer ordering two reels receives the price logic that normally applies to cartons.
- Stock stability across the family. We hold and re-secure the models on this page continuously, so a second order does not restart the sourcing problem you came here to solve.
- Export execution. Documentation, packing and freight for India, Vietnam, Thailand, Malaysia, the Philippines, the Middle East, Europe and the USA are routine for us, not a special case.
- Technical support on substitution. Function class, package, pinout, protocol and voltage checks — the ten steps above — are handled by people who work with these parts daily and will tell you when the answer is no.
- Quantity flexibility. Small first orders and partial-reel quantities are normal business for us, not an exception we tolerate.
- Datasheet and revision support. We send the datasheet revision with every quotation, so your approval references the document your production line will build to.
If you are replacing a part rather than choosing one for a new design, the background on how we secure the range is on the Titan Micro IC distributor page, and the full model list for a mixed BOM sits on the Titan Micro IC product portfolio page. Buyers who have to justify the origin of a part internally usually start with where to buy original Titan Micro ICs and the channel comparison for buying online. For application-level selection once the substitution is settled, the application guide takes the same decision rules further.
For a replacement decision specifically, the most useful thing you can send us is three lines: the part you currently use, the part you are considering, and your rail voltage plus whether the panel has buttons. That is enough for us to tell you whether the substitution is safe before either of us spends time on pricing.
Frequently asked questions
What is the best alternative to TM1637? Within the Titan Micro range, TM1650 for a 4-digit panel on a 3.3 V rail with buttons, or TM1616 for a display-only panel in the same 16-pin body. Neither is a drop-in for TM1637 in SOP20; both need a PCB revision. If you simply need TM1637 with stock behind it, the correct alternative is another supplier, not another part.
Can TM1650 replace HT16K33 directly? No. They are functionally similar in that both drive LED displays with key-scan support, but they use different buses and different driver libraries. The substitution is realistic in prototype work and rarely justified in a production programme unless a firmware revision is already planned.
Is TM1621B a replacement for HT1621B? This is the closest genuine replacement class in the portfolio: same function, same 4-wire serial interface, same LCD segment-driving role. Confirm the pin assignment and the current datasheet revision in writing before you commit, and validate with samples drawn from the production lot.
Can I use a TM1621B to drive an LED display? No. TM1621B is an LCD segment driver. Nothing in the LED family replaces it and it replaces nothing in the LED family. This is the most common mis-order we see in this range.
Why does the same pin count not mean the same part? Because the pin count states how many legs the package has, not what each leg does. TM1650 and TM1616 share a 16-pin body. TM1628, TM1638 and TM1621C share a 28-pin body, and two of the three are LED drivers while the third drives LCD glass.
Are TM1668 and TM1628 interchangeable as replacements? They are related but not identical. Both use a 3-wire serial interface and both include key-scan support, but the packages and drive capacities differ. Choose on digit count, key count and available board space.
Do you supply the non-Titan alternative in a comparison? No. We supply Titan Micro parts. Where a comparison shows a Holtek or Maxim device, we are telling you how the Titan Micro part relates to it — not offering to sell you the other brand.
How do I know a replacement part is original Titan Micro product? Ask for the datasheet revision, the package designator and the date code in writing, then check the device marking against them on arrival. Order a sample from the stock lot your production order will draw from, and tell us your acceptance criteria before dispatch so inspection is aligned to them.
Request a Quotation
Send us the part number, the package and the quantity you need. We will reply with price, confirmed stock and lead time for the the replacement you are evaluating.
See also the TM1637 supplier page. See also the TM1650 supplier page. See also the TM1621B LCD driver supplier page. See also the TM1637 vs TM1650 comparison.
Contact Newfly Electronics
Email: sales@newflyelectronics.com
WhatsApp: +86 15112635657