# SA555P

**Texas Instruments** · Timers / Counters · DIP-8

SA555P from Texas Instruments, in a DIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference for the device; all voltages in the datasheet are referenced to GND. |
| 2 | TRIG | input | Timing start input; when TRIG is below 1/2 CONT the output is set high and the discharge pin is open. |
| 3 | OUT | output | High-current timer output; recommended output current is ±200 mA. |
| 4 | RESET | input | Active-low reset input that forces the output and discharge pin low; tie to VCC when unused to avoid false triggering. |
| 5 | CONT | bidirectional | Controls the comparator threshold, provides 2/3 × VCC at the pin, and allows a bypass capacitor to be connected. |
| 6 | THRES | input | Timing end input; when THRES > CONT the output and discharge pin are driven low. |
| 7 | DISCH | output | Open-collector output that discharges the timing capacitor, conducting to GND while the output is low. |
| 8 | VCC | power_in | Supply voltage input; the recommended range for SA555 is 4.5 V to 16 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | DIP-8 |
| Category | Clock/Timing |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `SA555P`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `sa555p-etched.step` / `sa555p-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sa555p.step` / `sa555p.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/se555) (40 pp, sha256 `7ce3a7a81c99394f`, retrieved 2026-10-08, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sa555p-datasheet.pdf)