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NE555 DIP-8 Precision Timer IC — Monostable / Astable / PWM Oscillator (10-Pack)
NE555 DIP-8 Precision Timer IC Monostable / Astable / PWM Oscillator (10-Pack)
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NE555 DIP-8 Precision Timer IC — Monostable / Astable / PWM Oscillator (10-Pack)
The NE555 is the world’s most popular timer IC, with over one billion units sold annually. In a DIP-8 through-hole package, it operates from 4.5V to 16V and delivers a 200mA output capable of directly driving LEDs, relays, and small motors. Configurable in monostable (one-shot), astable (oscillator), or PWM modes with just a few external resistors and capacitors.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | NE555 / LM555 / SA555 |
| Package | DIP-8 |
| Supply Voltage | 4.5V – 16V DC |
| Output Current (Source/Sink) | 200mA |
| Timing Accuracy | ±1% (temperature stable) |
| Frequency Range | 0.1Hz – 500kHz |
| Trigger Threshold | 1/3 VCC |
| Reset Threshold | 2/3 VCC |
| Operating Temperature | 0°C to +70°C (NE555) / −55°C to +125°C (SE555) |
| Quantity | 10 pieces |
Operating Modes
| Mode | Function | Key Formula |
|---|---|---|
| Monostable | One-shot pulse on trigger | T = 1.1 × R × C |
| Astable | Free-running oscillator | f = 1.44 / ((R1+2×R2) × C) |
| PWM | Variable duty cycle output | Duty = R1/(R1+R2) × 100% |
Timing Component Calculator
| Target Frequency | R1 | R2 | C |
|---|---|---|---|
| 1Hz | 1kΩ | 72kΩ | 10μF |
| 1kHz | 1kΩ | 72kΩ | 10nF |
| 10kHz | 1kΩ | 6.2kΩ | 10nF |
| 100kHz | 1kΩ | 620Ω | 10nF |
Why Choose NE555?
- 200mA Output — Directly drives LEDs, small relays, buzzers, and DC motors without transistor buffer
- ±1% Timing Accuracy — Temperature-stable timing for reliable delay and oscillator circuits
- Wide Supply Range — 4.5V–16V covers 5V, 9V, and 12V systems
- Three Operating Modes — Monostable, astable, and PWM from a single IC
- Industry Classic — Extensive documentation, tutorials, and reference designs available
Typical Applications
- Time delay relay (monostable: trigger → fixed output pulse)
- LED flasher and blinker (astable oscillator)
- PWM motor speed controller (astable with variable duty cycle)
- Debounce circuit for mechanical switches
- Tone generator and alarm circuit
- Missing pulse detector (monostable reset by input pulses)
- Voltage-controlled oscillator (VCO) with control voltage on pin 5)
FAQ
Q: What is the difference between NE555, LM555, and SA555?
A: Electrically identical — NE555 (Texas Instruments/STMicro, 0–70°C), LM555 (National Semiconductor), SA555 (industrial grade, −40°C to +85°C). All are pin-compatible and interchangeable in most applications.
Q: Can NE555 generate audio tones?
A: Yes — in astable mode, set frequency to 20Hz–20kHz audio range. Connect output to speaker via 100μF capacitor. For variable pitch, use a potentiometer for R2.
Package Contents
- 10× NE555 DIP-8 Precision Timer IC
