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20PCS NE555 / NE555P / NE555N DIP-8 Precision Timer IC for Oscillator and Programming
20PCS NE555 / NE555P / NE555N DIP-8 Precision Timer IC for Oscillator and Programming
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NE555 / NE555P / NE555N DIP-8 Precision Timer IC — 20PCS, Oscillator & Timing Circuits
The NE555 is the world’s most widely used timer IC, providing precise timing, oscillation, and pulse generation in a standard DIP-8 package. This 20-piece pack of NE555 / NE555P / NE555N ICs covers all three standard operating modes — astable (oscillator), monostable (one-shot timer), and bistable (flip-flop) — making it the essential building block for timing circuits, PWM generators, LED flashers, tone generators, and countless other analogue and mixed-signal applications.
Technical Specifications
| Parameter | Value |
|---|---|
| IC Type | NE555 / NE555P / NE555N (equivalent) |
| Package | DIP-8 (through-hole) |
| Supply Voltage | 4.5V – 16V DC |
| Output Current | 200mA source / sink |
| Timing Accuracy | ±1% (temperature stable) |
| Frequency Range | DC to 500kHz (astable mode) |
| Operating Temperature | 0°C to +70°C (NE grade) |
| Operating Modes | Astable, Monostable, Bistable |
| Trigger Input | Active low (triggers below 1/3 VCC) |
| Reset Input | Active low (overrides all modes) |
| Pack Quantity | 20PCS |
| Certification | RoHS |
Operating Mode Reference
| Mode | Configuration | Output | Use Case |
|---|---|---|---|
| Astable | R1, R2, C between pins | Continuous square wave | Oscillator, LED flasher, PWM, tone generator |
| Monostable | R, C + trigger input | Single pulse on trigger | Debounce, delay timer, one-shot pulse |
| Bistable | Set/Reset inputs | Latched high/low | SR flip-flop, memory element |
Astable Frequency Formula
f = 1.44 / ((R1 + 2×R2) × C)
Duty cycle = (R1 + R2) / (R1 + 2×R2) × 100%
Monostable Pulse Width Formula
t = 1.1 × R × C (seconds, with R in ohms and C in farads)
Typical Applications
- LED Flasher: Astable oscillator driving an LED at 1–10Hz for indicator, alarm, and decorative lighting applications
- PWM Motor Speed Control: Astable NE555 generating a variable duty cycle PWM signal for DC motor speed control via MOSFET or BJT driver
- Tone Generator: Astable oscillator in the audio frequency range (20Hz–20kHz) driving a piezo buzzer or speaker for alarm and notification tones
- Switch Debounce: Monostable timer providing a clean, debounced output pulse from a noisy mechanical switch or button input
- Delay Timer: Monostable timer providing a precise time delay (milliseconds to hours) for relay activation, power sequencing, and timed shutoff circuits
- Missing Pulse Detector: Monostable timer reset by an input pulse — output goes high if the input pulse is missing for longer than the timeout period
- Voltage-Controlled Oscillator: Control oscillator frequency via the CV (control voltage) pin for simple VCO and modulation applications
FAQ
Q: What is the difference between NE555, NE555P, and NE555N?
A: These are equivalent parts from different manufacturers — NE555 (Texas Instruments original), NE555P (TI DIP-8 suffix), NE555N (Philips/NXP designation). All are electrically identical and pin-compatible.
Q: Can the NE555 directly drive a relay?
A: Yes. The NE555 output can source or sink up to 200mA, sufficient to drive a 5V or 12V relay coil directly (with a flyback diode across the relay coil to protect the IC from back-EMF).
Package Contents
- 20 × NE555 / NE555P / NE555N DIP-8 precision timer IC
