20PCS NE555 / NE555P / NE555N DIP-8 Precision Timer IC for Oscillator and Programming

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

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