HT1621B

The HT1621B is a 128-segment LCD driver with built-in display RAM, commonly used in low-power applications like digital displays, meters, and small appliances.
### Key Features:
- 128 segments (32×4 or 16×8 configurations)
- Built-in 256kHz RC oscillator (no external crystal needed)
- 3-wire serial interface (compatible with microcontrollers)
- Low power consumption (supports 1/2, 1/3 bias LCD driving)
- Wide voltage range (2.4V–5.2V)
### Applications:
- Digital clocks, thermostats, scales, and small LCD panels
It simplifies LCD control by handling segment driving internally, reducing MCU workload. Commands and data are sent via CS, WR, and DATA pins.
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The HT1621B is a LCD driver IC. Equivalent alternatives include:
- Sitronix ST1621B
- Holtek HT1622 (similar, with slight differences)
- Nuvoton N79E814 (MCU with built-in LCD driver)
- TI MSP430 with LCD modules (for programmable solutions)
These chips offer similar functionality for segment LCD control. Always check datasheets for pin compatibility and features.

The HT1621B is manufactured by Holtek Semiconductor Inc., a Taiwan-based company specializing in integrated circuits (ICs).
Holtek is a leading microcontroller (MCU) and IC design house, known for its LCD drivers, MCUs, and mixed-signal solutions. Founded in 1983, it serves industries like consumer electronics, home appliances, and industrial applications. The HT1621B is a memory-mapped LCD driver, commonly used in devices requiring segment displays.
Holtek emphasizes cost-effective, low-power solutions and has a strong presence in Asia and global markets.

The HT1621B is a versatile LCD driver IC commonly used in:
1. Consumer Electronics – Appliances (microwaves, washing machines), calculators, and digital clocks.
2. Industrial Controls – Instrument panels, meters, and automation displays.
3. Automotive – Dashboard displays and control panels.
4. Medical Devices – Portable monitors and diagnostic equipment.
5. Home Automation – Smart thermostats and security systems.
It supports multiple LCD segments (up to 128), features low power consumption, and integrates well with microcontrollers, making it ideal for cost-effective, segment-based display solutions.

The HT1621B is commonly available in SOP-48 (Small Outline Package) and DIP-48 (Dual In-line Package) types. These packages support easy integration into LCD driver circuits, with SOP-48 being more compact for surface-mount applications, while DIP-48 suits through-hole PCB designs. Both provide reliable connectivity for segment and common outputs in display modules.