555 timer is a low-cost programmable timer that has one-shot, astable and multivibrator functions. It is easy to use and widely used in various measurement and control circuits.
The NE555 family of monolithic timing circuits from Philips Semiconductors offers stable timing and oscillator functions. Depending on the variant (NE555, SA555, SE555, SE555C) the device can operate from 5 V to 18 V and supports both astable and monostable modes with adjustable duty cycle and TTL compatibility.
The datasheet lists absolute maximum ratings, detailed DC and AC electrical characteristics, typical performance curves, and example application circuits. It also includes ordering information for various package types such as DIP, SO, and hermetic ceramic packages.
| Supply voltage | NE555: +18 V, SA555: +16 V, SE555/SE555C: +18 V |
|---|---|
| Maximum allowable power dissipation | 600 mW |
| Operating temperature range | NE555: 0 °C to +70 °C; SA555: –40 °C to +85 °C; SE555/SE555C: –55 °C to +125 °C |
| Turn‑off time | < 2 µs |
| Maximum operating frequency | > 500 kHz |
NE555 operates up to +18 V, SA555 up to +16 V, and SE555/SE555C up to +18 V.
The turn‑off time is less than 2 µs.
The SE555 and SE555C can operate from –55 °C to +125 °C.