TM1638 8-Digit LED Display & 16-Key Keypad Module (3-Wire)
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Prices updated: 12 Oct 2026
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About this product
A TM1638-based module with eight common-anode 7-segment digits with decimal points and a 2x8 matrix of 16 keys. It is driven over a 3-wire serial interface (STB, CLK, DIO), so the host microcontroller needs only three I/O pins and no separate scanning circuitry. Suited to counters, clocks and menu-driven projects.
Specifications
- Driver IC
- TM1638
- Display digits
- 8 (with decimal point)
- Display type
- Common anode 7-segment
- Keys
- 16 (2 x 8 matrix)
- Interface
- 3-wire (STB, CLK, DIO)
- Brightness levels
- 8
- Dimensions
- 68 x 68 mm
- Weight
- 34 g
Frequently asked questions
Do I need a separate scanning circuit or library to use it?
No external scanning circuit is needed because the TM1638 handles digit multiplexing and key scanning. A TM1638 library is commonly used on the microcontroller side to send commands over the STB, CLK and DIO lines.
What supply voltage does it need?
The listing does not state a supply voltage. TM1638 modules are commonly designed for 5 V logic, so confirm the rating printed on the board before connecting power.
