Texas Instruments
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The 555 timer: astable oscillator, monostable one-shot or pulse generator from one RC network. In production since 1972.
| Part number | NE555 |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Integrated Circuits › Timers & Oscillators |
| Package | DIP-8 |
| Pins | 8 |
NE555 pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | GND | ground | Ground |
| 2 | TRIG | input | Trigger — fires when below 1/3 VCC |
| 3 | OUT | output | Output, 200mA |
| 4 | RESET | input | Active-low reset — tie to VCC if unused |
| 5 | CTRL | analog | Control voltage — 10nF to ground if unused |
| 6 | THRES | input | Threshold — ends the cycle above 2/3 VCC |
| 7 | DISCH | oc | Discharge for the timing capacitor |
| 8 | VCC | power | Supply, 4.5–16V |
Schematic symbol and footprint
Schematic symbol
Footprint: DIP-8 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.