Is AiP1637 pin-compatible with TM1637?

Yes. Both use the same SOP-20 pin assignment: GND on pin 1, segment/key-scan outputs on pins 2–9, digit outputs on pins 10–15, VDD on 16, DIO on 17, CLK on 18 and key inputs K1–K2 on 19–20.

Does the TM1637 Arduino library work with AiP1637?

The two chips use the same two-wire command structure, so TM1637 libraries are the usual starting point. Verify command codes and timing with the AiP1637 datasheet and test with samples.

Can AiP1637 run at 3.3 V?

The AiP1637 datasheet (2026-09-B2) specifies a 3.0–5.5 V logic supply. LED brightness at 3.3 V depends on the LED forward voltage.

Comparison guide · updated 27 October 2026

TM1637 vs AiP1637: pin-compatible 4/6-digit LED driver alternative

AiP1637 from I-CORE is a pin-compatible alternative to the Titan Micro TM1637 LED driver: same SOP-20 pinout, 8×6 common-anode display, 8×2 key scan and 2-wire interface, with a wider 3.0–5.5 V supply.

The TM1637 from Titan Micro is the LED driver behind countless 4-digit and 6-digit 7-segment modules, appliance panels and Arduino projects. I-CORE (Wuxi I-CORE Electronics) makes a functional equivalent, the AiP1637, in the same SOP-20 package and pinout. This page compares the two from their datasheets so you can decide whether AiP1637 can go on your BOM.

AIP1637 — stock & specs AIP1637 datasheet (PDF)Free sample

Side-by-side comparison

Parameter	TM1637	AIP1637 (I-CORE)
Display	8 segments × 6 digits, common anode	8 segments × 6 grids, common anode
Key scan	8 × 2	8 × 2
Interface	2-wire serial (CLK, DIO)	2-wire serial (CLK, DIO)
Brightness	8 levels (PWM)	8 levels
Supply voltage	4.5–5.5 V	3.0–5.5 V
Operating temperature	−40 to +85 °C	−40 to +85 °C
Packages	SOP-20, DIP-20	SOP-20, DIP-20
Pinout (SOP-20)	1 GND, 2–9 SEG1–8/KS1–8, 10–15 GRID6–1, 16 VDD, 17 DIO, 18 CLK, 19–20 K1–K2	Same

Can I drop AiP1637 into a TM1637 board?

In most designs, yes: the SOP-20 pinout, display organisation, key matrix and two-wire protocol (start / stop / ACK framing, 8-bit commands) match. The AiP1637 datasheet also specifies operation down to 3.0 V, which is useful for 3.3 V modules. As with any second source, run your board and firmware with samples before switching production.

Firmware

Code written for TM1637 — including the common Arduino TM1637Display library — is the usual starting point. Check the command codes, maximum clock rate and key-read timing against the AiP1637 datasheet, especially if your driver bit-bangs the bus close to its timing limits.

Typical applications

Induction cookers, microwave ovens, small appliance panels, clocks and 4-digit or 6-digit 7-segment display modules.

FAQ

Is AiP1637 pin-compatible with TM1637?: Yes. Both use the same SOP-20 pin assignment: GND on pin 1, segment/key-scan outputs on pins 2–9, digit outputs on pins 10–15, VDD on 16, DIO on 17, CLK on 18 and key inputs K1–K2 on 19–20.
Does the TM1637 Arduino library work with AiP1637?: The two chips use the same two-wire command structure, so TM1637 libraries are the usual starting point. Verify command codes and timing with the AiP1637 datasheet and test with samples.
Can AiP1637 run at 3.3 V?: The AiP1637 datasheet (2026-09-B2) specifies a 3.0–5.5 V logic supply. LED brightness at 3.3 V depends on the LED forward voltage.

Sources

I-CORE AiP1637 English datasheet, revision 2026-09-B2
Titan Micro TM1637 listing on LCSC (C20001): supply 4.5–5.5 V, −40 to +85 °C, 8 × 6 configuration

Figures are from the documents listed; always confirm against the latest datasheets before design-in. TM1637 is a part number of its respective owner and is shown for cross-reference only.