TM1624 from TM Shenzhen Titan Micro Elec, in a SOIC-24-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	DIN	bidirectional	Serial data input (DIO). Data is shifted in LSB-first on the rising edge of CLK; data is output on the falling edge (chip supports read-back, hence bidirectional).
2	CLK	input	Serial clock input. Data is read on rising edges; output data is driven on falling edges. Ignored while STB is high.
3	STB	input	Chip-select / strobe. A rising or falling edge initializes the serial interface; the first byte after STB goes low is treated as a command. Driving STB high aborts the current transaction and forces CLK to be ignored.
4	VDD	power_in	Logic supply, 5 V ±10%.
5	SEG1	output	Segment output 1, P-channel open-drain. Connects to the anode of a common-cathode LED segment (must never be tied to a cathode).
6	SEG2	output	Segment output 2, P-channel open-drain LED-anode driver.
7	SEG3	output	Segment output 3, P-channel open-drain LED-anode driver.
8	SEG4	output	Segment output 4, P-channel open-drain LED-anode driver.
9	SEG5	output	Segment output 5, P-channel open-drain LED-anode driver.
10	SEG6	output	Segment output 6, P-channel open-drain LED-anode driver.
11	SEG7	output	Segment output 7, P-channel open-drain LED-anode driver.
12	SEG8	output	Segment output 8, P-channel open-drain LED-anode driver.
13	SEG9	output	Segment output 9, P-channel open-drain LED-anode driver.
14	SEG10	output	Segment output 10, P-channel open-drain LED-anode driver.
15	SEG11	output	Segment output 11, P-channel open-drain LED-anode driver.
16	SEG12/GRID7	output	Muxed segment/grid output. Acts as SEG12 (P-channel open-drain anode driver) in modes with fewer digits, and as GRID7 (N-channel open-drain cathode/common driver) in the 7-digit x 11-segment mode.
17	SEG13/GRID6	output	Muxed segment/grid output. Acts as SEG13 in 4-5 digit modes and as GRID6 (N-channel open-drain) in 6- and 7-digit modes.
18	SEG14/GRID5	output	Muxed segment/grid output. Acts as SEG14 in 4-digit mode and as GRID5 (N-channel open-drain) in 5-, 6- and 7-digit modes.
19	GND	power_in	Logic ground. Tie to system ground; both GND pins (19 and 22) must be connected.
20	GRID4	output	Digit/grid output 4, N-channel open-drain. Connects to the common cathode of digit 4 (must never be tied to an anode).
21	GRID3	output	Digit/grid output 3, N-channel open-drain common-cathode driver.
22	GND	power_in	Logic ground. Second GND pin; tie together with pin 19 to system ground.
23	GRID2	output	Digit/grid output 2, N-channel open-drain common-cathode driver.
24	GRID1	output	Digit/grid output 1, N-channel open-drain common-cathode driver.

Key specifications

Parameter	Value
Manufacturer	TM Shenzhen Titan Micro Elec
Package	SOIC-24-300mil
Category	LED-drv
Pins	24

CAD (KiCad official)

Symbol: TM1624
Footprint: Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm
3D model: SOIC-24-300mil (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: TM Shenzhen Titan Micro Elec datasheet (16 pp, sha256 a5933d29cc33f603, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF