NE555 Timer IC DIP-8 — Monostable / Astable, 4.5–16V, 200mA Output, Arduino

NE555 Timer IC — The Universal Timer/Oscillator, DIP-8

The NE555 is the most iconic and widely used timer IC ever produced — over 1 billion units are manufactured annually, and it has been in continuous production since 1972. In a single 8-pin DIP package, the NE555 implements a precision timing circuit that can operate as a monostable (one-shot) timer, an astable (free-running) oscillator, or a bistable flip-flop, with timing adjustable from microseconds to hours using just a few resistors and a capacitor. Its 200mA output drive capability means it can directly drive LEDs, small relays, buzzers, and speaker elements without additional transistors.

Key Features

• Monostable, astable, and bistable modes — one IC, three operating modes
• Timing range: microseconds to hours — set by external R and C
• Output drive: sink or source up to 200mA — directly drives LEDs, relays, buzzers
• Supply voltage: 4.5–16V — works with 5V Arduino and 9V/12V supplies
• 5V logic compatible output levels at 5V supply
• Adjustable duty cycle in astable mode
• Temperature stable — 0.005% per °C drift
• DIP-8 package — breadboard and through-hole PCB compatible

Technical Specifications

Operating Voltage	4.5–16V
Supply Current	6–15mA
Output Current (sink/source)	±200mA
Max Frequency (astable)	~500kHz
Timing Accuracy	±1% (typical)
Temperature Drift	0.005% / °C
Package	DIP-8 (through-hole)
Manufacturer	Texas Instruments / STMicroelectronics / ON Semiconductor

Operating Modes

• Monostable (one-shot): Triggered by a pulse, outputs a single pulse of duration T = 1.1 × R × C. Used for debouncing, delay timers, and pulse stretching.
• Astable (oscillator): Free-running square wave output. Frequency f = 1.44 / ((R1 + 2×R2) × C). Used for LED flashers, tone generation, PWM, and clock signals.
• Bistable (flip-flop): Set/Reset latch using TRIGGER and RESET pins. Used for switch debouncing and latching circuits.

Typical Applications

• LED flasher and blinker circuits
• Tone and alarm generator (buzzer driver)
• PWM signal generation for motor speed control
• Delay timer for relay activation
• Missing pulse detector
• Switch debounce circuit
• Clock signal generator for digital circuits
• Arduino project timing and oscillator circuits

Package Contents

• 1 × NE555 Timer IC (DIP-8, through-hole)

NE555 Datasheet (Texas Instruments PDF)

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