# NE555P

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

NE555P from Texas Instruments, in a DIP-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). Connect to the negative supply rail. |
| 2 | TRIG | input | Trigger input. The output is set high and the timing interval starts when this input falls below 1/3 of VCC. |
| 3 | OUT | output | Timer output. Drives high (near VCC) or low (near GND); can source/sink up to ~200 mA. |
| 4 | RESET | input | Active-low reset. When pulled below ~0.7 V, forces OUT low and resets the timing cycle. Tie to VCC when not used. |
| 5 | CONT | input | Control voltage. Provides access to the internal 2/3 VCC reference divider; allows external modulation of thresholds. Typically bypassed with a 10 nF capacitor to GND. |
| 6 | THRES | input | Threshold input. When this input rises above 2/3 of VCC, the output is set low and the discharge transistor turns on. |
| 7 | DISCH | output | Discharge. Open-collector output that provides a discharge path for the external timing capacitor when OUT is low. |
| 8 | VCC | power_in | Positive supply voltage. Operating range 4.5 V to 16 V (NE555). |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `NE555PP`
- `NE555PD`
- `NE555PDR`
- `NE555PDGK`
- `NE555PDGKR`
- `NE555PPS`
- `NE555PPSR`

## CAD (KiCad official)

- Symbol: `NE555P`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `ne555p-etched.step` / `ne555p-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ne555p.step` / `ne555p.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/ne555) (40 pp, sha256 `b7b62a877fd591a6`, 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](docs/ne555p-datasheet.pdf)