GN1638
MI
Needs validationmedium risk
GN1638 is a similar SOP28 LED driver candidate for 5V designs after pinout review.
Best Alternatives to TM1628A
TM1628A replacement choices need careful review. No candidate here is proven pin-compatible from the provided fields.
AI replacement insight
Electrical riskmedium
Some candidates show 5V-only ranges.
Package riskmedium
Only GN1638 matches SOP28.
Firmware riskhigh
Command and display maps are unchecked.
Sourcing riskmedium
Lifecycle is incomplete for some parts.
Can it be replaced directly?
Direct replacement for TM1628A should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Check GN1638 first for 5V SOP28 designs, then verify pinout, command set, and key matrix.
Main risk
Pinout and scan-matrix compatibility are not proven.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | TM1628A | GN1638 | TM1629B | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP28, 28-pin | SOP28, 28-pin | SOP-32, 32-pin | SOP28, 28-pin / SOP-32, 32-pin — Mechanical name matches; TM1629B: Not board fit | |
| Pinout | Not provided | Not provided | 32-pin unknown | Not provided / 32-pin unknown — No pin map evidence; TM1629B: Pin count differs | |
| Voltage | 3V to 6V | 5V ±10% | 5V ±10% | 5V ±10% — Not shown for 3V; TM1629B: No 3V support shown | |
| Interface | CLK, STB, DIO | CLK, DIO, STB | CLK, STB, DIO | CLK, DIO, STB / CLK, STB, DIO — Same 3-wire signals; TM1629B: Same signal names | |
| Application | LED, 10x2 keys | 10x8 display, 8x3 keys | 14x8 display, 8x2 keys | 10x8 display, 8x3 keys / 14x8 display, 8x2 keys — Matrix differs; TM1629B: Matrix differs |
Application & sourcing insights
Questions & answers
Verified drop-in options for TM1628A are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.