SE555P from Texas Instruments, in a PDIP-8. 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	GND	power_in	Ground reference (0 V) for the device. All voltages are measured with respect to this pin.
2	TRIG	input	Trigger input. The output goes high and the timing interval starts when this input falls below 1/3 VCC (the trigger threshold).
3	OUT	output	Timer output. Drives high (near VCC) during the timing interval and low (near GND) otherwise. Can source or sink up to 200 mA.
4	RESET	input	Active-low reset. When pulled below ~0.7 V, forces the output low and resets the timing cycle. Tie to VCC when unused.
5	CONT	input	Control voltage. Provides access to the internal 2/3 VCC reference; an external voltage or bypass capacitor (typ. 10 nF to GND) can alter timing or reject noise.
6	THRES	input	Threshold input. The timing interval ends when the voltage on this pin rises above 2/3 VCC (or the CONT voltage).
7	DISCH	output	Discharge. Open-collector output that goes low to discharge the external timing capacitor at the end of each timing interval.
8	VCC	power_in	Positive supply voltage. Operating range 4.5 V to 18 V for the SE555.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	PDIP-8
Category	RTC
Pins	8

Ordering variants

Same part, different packaging or reel option.

SE555PP

CAD (KiCad official)

Symbol: SE555P
Footprint: Package_DIP:DIP-8_W7.62mm
3D model: PDIP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`se555p.step`	271 KB	You want the bare part, or you mark your own boards.
`se555p-etched.step`	1.6 MB	You want the part with `SE555P` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 392 faces against 148 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Texas Instruments datasheet (37 pp, sha256 a3c494d783f9c61f, retrieved 2026-08-17, tier: lcsc)
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