Introduction
When you are designing an energy meter, thermostat, or industrial measurement device that requires a reliable LCD segment driver, you have likely encountered two popular part numbers: the TM1621B from Titan Micro Electronics (天微电子) and the HT1621B from Holtek Semiconductor. Both ICs serve the same fundamental purpose — driving LCD displays with RAM-mapping architecture and serial interfaces — yet procurement professionals and hardware engineers need to understand the practical differences before placing a volume order.
Overseas buyers from India, Southeast Asia, the Middle East, and Europe frequently search for TM1621B vs HT1621B comparisons because these two chips are pin-compatible and functionally equivalent in most applications. However, supply chain stability, unit pricing, datasheet availability, and local technical support vary significantly between the two manufacturers. This guide compares both LCD driver ICs from a purchasing perspective so you can make a confident sourcing decision.
Product Overview
TM1621B — Titan Micro Electronics
The TM1621B is a RAM-mapping LCD segment driver IC manufactured by Titan Micro Electronics (天微电子), a leading Chinese semiconductor company specializing in display driver solutions. The TM1621B supports 32 segments × 4 commons (32×4) or 32 segments × 8 commons (32×8) LCD configurations, making it suitable for a wide range of display densities in metering and control applications.
The IC communicates via a 4-wire serial interface (CS, RD, WR, DATA) and includes an internal RC oscillator, which reduces external component count. It is available in SSOP48 and LQFP44 packages, giving engineers flexibility depending on PCB space and assembly requirements. Operating voltage ranges from 2.4V to 5.5V, covering both battery-powered and mains-powered systems.
HT1621B — Holtek Semiconductor
The HT1621B is Holtek’s established LCD driver IC with similar architecture and functionality. It also supports 32×4 LCD segment driving with RAM-mapping and a serial interface. Holtek is a well-known Taiwan-based semiconductor manufacturer, and the HT1621B has been widely adopted in energy meters, white goods, and industrial displays for many years.
Like the TM1621B, the HT1621B operates from 2.4V to 5.5V and includes an internal oscillator. It is commonly available in SSOP48 and LQFP44 packages. Because Holtek has a longer international presence, the HT1621B is sometimes the default choice for engineers who are not aware of equivalent alternatives from mainland Chinese suppliers.
Technical Specifications
| Parameter | TM1621B (Titan Micro) | HT1621B (Holtek) |
|---|---|---|
| Manufacturer | Titan Micro Electronics (天微电子) | Holtek Semiconductor |
| Display Configuration | 32 × 4 or 32 × 8 segments | 32 × 4 segments |
| Interface Type | 4-wire serial (CS, RD, WR, DATA) | 4-wire serial (CS, RD, WR, DATA) |
| Operating Voltage | 2.4V – 5.5V | 2.4V – 5.5V |
| Internal Oscillator | Yes (RC oscillator built-in) | Yes (RC oscillator built-in) |
| Package Options | SSOP48, LQFP44 | SSOP48, LQFP44 |
| RAM Mapping | Yes | Yes |
| Bias Configuration | 1/2, 1/3 bias selectable | 1/2, 1/3 bias selectable |
| Power Consumption | Ultra-low power design | Low power design |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C |
From a pure technical standpoint, the TM1621B and HT1621B are nearly identical. Both offer the same display capacity, voltage range, package options, and bias settings. The TM1621B does offer an extended 32×8 mode in some variants, which can be advantageous if your design requires higher segment counts without upgrading to a larger driver IC.
Applications
Both the TM1621B and HT1621B are used in applications where static or multiplexed LCD displays need reliable segment driving with minimal microcontroller overhead. Common commercial applications include:
- Energy Meters: Single-phase and three-phase electricity meters for residential and industrial use, particularly in India, Southeast Asia, and the Middle East where cost-sensitive designs dominate.
- Thermostats and HVAC Controllers: Room temperature controllers, central air conditioning panels, and smart home climate systems requiring clear 7-segment or custom LCD readouts.
- Measurement Instruments: Digital multimeters, power analyzers, panel meters, and process control displays that need stable LCD contrast across temperature variations.
- White Goods: Washing machines, refrigerators, and microwave oven control panels using segment LCDs instead of more expensive graphical displays.
- Industrial Control Panels: PLC HMI modules, status indicators, and equipment monitoring displays in factory automation environments.
Both ICs are fully capable in these roles. The real differentiator for purchasing managers is not the silicon itself — it is the supply chain reliability, unit cost, and distributor support behind each part number.
TM1621B vs HT1621B — Detailed Comparison
| Comparison Factor | TM1621B | HT1621B | Winner for Buyers |
|---|---|---|---|
| Pin Compatibility | Fully pin-compatible with HT1621B | Industry standard footprint | Tie — direct drop-in replacement |
| Code Compatibility | Same command set and register map | Original reference design | Tie — no firmware changes needed |
| Unit Price (1K+ qty) | Lower China supply chain pricing | Higher due to brand premium | TM1621B — better margin |
| Stock Availability | Stable China factory output | Subject to Taiwan fab allocation | TM1621B — shorter lead times |
| MOQ Flexibility | Small quantity supported (hundreds) | Often 1K+ or distributor MOQ | TM1621B — better for prototypes |
| Export Lead Time | 3–7 days from China stock | 2–4 weeks via Taiwan channels | TM1621B — faster delivery |
| Distributor Support | Direct factory relationship possible | Multi-tier distribution common | TM1621B — closer to source |
| Technical Documentation | Complete Chinese + English datasheets | English datasheets widely available | Tie — both well documented |
| Brand Recognition | Growing in Asia, Middle East, Africa | Established global brand | HT1621B — but TM1621B catching up |
| Long-term Supply Stability | Strong domestic China demand ensures production | Stable but allocation risk during shortages | TM1621B — resilient supply |
Key Takeaways for Purchasing Managers
1. Drop-in Replacement: The TM1621B is electrically and pin-compatible with the HT1621B. If you have an existing HT1621B design, you can qualify the TM1621B without PCB redesign or firmware changes. This makes the TM1621B an excellent second-source strategy to reduce supply chain risk.
2. Cost Advantage: Because Titan Micro is a mainland Chinese manufacturer with direct wafer sourcing and high-volume domestic demand, the TM1621B typically carries a lower unit price than the HT1621B when sourced through a competent distributor. For projects with tight BOM targets — common in India, Vietnam, and Thailand — this cost gap matters.
3. Faster Procurement: China-based stock and direct export capability mean TM1621B orders can ship within days rather than weeks. If your production line is waiting on LCD driver ICs, the shorter lead time of the TM1621B can prevent costly line stoppages.
4. Supply Resilience: During global semiconductor shortages, Taiwan and international brands often allocate volume to tier-one customers first. Chinese domestic manufacturers like Titan Micro maintained more consistent output for standard display driver ICs because their fabs serve massive local appliance and meter markets.
Buying Guide — How to Source LCD Driver ICs Reliably
Whether you choose the TM1621B or the HT1621B, follow these procurement best practices to avoid counterfeit parts, stock shortages, and quality issues:
Verify Original Manufacturer Source: Insist on traceable supply chain documentation. For the TM1621B, request factory COA (Certificate of Analysis) or original reel labels from Titan Micro. Counterfeit LCD drivers are rare but not impossible, especially for high-volume commodity parts.
Check Date Codes and Packaging: Authentic Titan Micro ICs use standard embossed marking with clear date codes and lot numbers. Vacuum-sealed antistatic packaging with humidity indicator cards is standard for genuine parts.
Request Datasheet and Application Notes: A reliable supplier provides the complete English datasheet, timing diagrams, and reference schematics. If a distributor cannot produce technical documentation, that is a red flag.
Evaluate Export Experience: Not every China-based chip trader understands international shipping, customs documentation, and Incoterms. Choose a supplier with proven export experience to India, Southeast Asia, the Middle East, or your specific region.
MOQ and Sample Policy: For prototype validation, you should be able to order sample quantities (10–50 pieces) without excessive minimum order requirements. Once qualified, negotiate volume pricing for 1K, 5K, and 10K+ quantities.
Technical Support Availability: LCD driver timing, bias settings, and contrast tuning can require engineering support. A distributor with in-house technical capability can help you optimize display performance and reduce development time.
Why Choose Newfly Electronics as Your Titan Micro IC Supplier
At Newfly Electronics, we specialize in the distribution of Titan Micro (天微电子) display driver ICs to overseas markets. Our direct factory relationships and China supply chain expertise give you tangible advantages over sourcing through generic trading companies or international distributors with multiple markup layers.
Competitive Pricing: Because we work directly with Titan Micro authorized channels and maintain volume inventory, we offer TM1621B pricing that undercuts typical international distributor quotes. This pricing advantage is especially significant for buyers in India, Malaysia, Thailand, Vietnam, and the Middle East who need cost-effective LCD driver solutions.
Stock Availability: We maintain ready stock of TM1621B in SSOP48 and LQFP44 packages. Small quantities ship within 24–48 hours. Volume orders are fulfilled within 3–7 days from our China warehouse.
Export and Logistics Support: We handle customs documentation, packing lists, and commercial invoices as standard practice. Whether you need DDP delivery to Mumbai, CPT to Ho Chi Minh City, or EXW Shenzhen, we accommodate your shipping terms.
Technical Support: Our team understands LCD driver timing, bias configuration, and microcontroller interfacing. If your engineering team needs application guidance for the TM1621B, we provide direct technical support — not just a sales quote.
Flexible Ordering: We support both small prototype quantities and large production volumes. Whether you need 100 pieces for a pilot run or 50,000 pieces for a meter manufacturing contract, we scale with your demand.
Related Titan Micro Products: We also stock TM1637 LED display driver ICs, TM1640 LED panel drivers, TM1650 appliance display drivers, and TM1628 control panel drivers. Consolidate your display driver purchasing with a single reliable supplier.
Contact us today for TM1621B pricing, datasheets, and availability:
- Email: sales@newflyelectronics.com
- WhatsApp: +86 15112635657
Frequently Asked Questions
Is TM1621B compatible with HT1621B?
Yes. The TM1621B is pin-to-pin and functionally compatible with the HT1621B. You can replace an HT1621B with a TM1621B in the same PCB design without changing firmware or hardware configuration. Both ICs use the same 4-wire serial interface protocol and register commands.
Where can I buy original TM1621B ICs?
You can buy original TM1621B LCD driver ICs from Newfly Electronics, a specialized Titan Micro distributor. We supply both SSOP48 and LQFP44 packages with factory traceability, competitive pricing, and fast international shipping. Contact us at sales@newflyelectronics.com or WhatsApp +86 15112635657 for a quotation.
What is the price difference between TM1621B and HT1621B?
The TM1621B typically costs less than the HT1621B when sourced through China-based distributors, mainly due to shorter supply chains and domestic manufacturing advantages. The exact price depends on order quantity, package type, and delivery terms. Request a quote from Newfly Electronics for current pricing.
Does Newfly Electronics provide the TM1621B datasheet?
Yes. We provide the complete English TM1621B datasheet, including electrical characteristics, timing diagrams, register descriptions, and application circuit examples. The datasheet is sent free of charge with your quotation or sample order.
What package types are available for TM1621B?
The TM1621B is available in SSOP48 (shrink small outline package, 48 pins) and LQFP44 (low-profile quad flat package, 44 pins). Both packages are RoHS compliant and suitable for surface-mount assembly. The SSOP48 is more common in energy meter designs, while the LQFP44 may be preferred for thermostats with space constraints.
Can I order small quantities of TM1621B for prototyping?
Yes. Newfly Electronics supports small-quantity orders starting from a few hundred pieces or less. We understand that prototyping and pilot production require flexible MOQs. Contact us with your quantity requirement and we will accommodate your project phase.
Is TM1621B suitable for energy meter applications?
Yes. The TM1621B is widely used in single-phase and three-phase energy meters across India, Southeast Asia, and the Middle East. Its 32×4 segment capacity, low power consumption, and wide operating voltage make it ideal for mains-powered and battery-backed meter displays.
Request Your TM1621B Quotation Today
If you are evaluating the TM1621B as a replacement for the HT1621B or need a reliable source for your new LCD display design, Newfly Electronics is ready to support your procurement.
We offer:
- Competitive pricing on original Titan Micro TM1621B ICs
- SSOP48 and LQFP44 packages in stock
- Fast export delivery to India, Southeast Asia, the Middle East, Europe, and the Americas
- Free datasheet and technical application support
- Flexible MOQs for prototypes and volume production
Get in touch now:
- Email: sales@newflyelectronics.com
- WhatsApp: +86 15112635657
Send us your target quantity, destination country, and preferred package type. We will reply with a detailed quotation including unit price, lead time, and shipping options within one business day.