NE555P Precision Timer IC by Texas Instruments. DIP-8 package. 4.5-16V supply, 200mA output. Do NOT exceed 16V -- will damage the IC.
Two modes: Monostable (one-shot timer) and Astable (free-running oscillator). Timing set by external resistors and capacitors -- microseconds to hours. TTL compatible at 5V. Active-low reset pin.
Key Specs:
• Supply: 4.5V to 16V
• Output Current: ±200mA max
• Timing Accuracy: 1% (monostable)
• Temp Range: 0°C to 70°C
• Package: DIP-8 (0.1" pitch, breadboard compatible)
Setup: Tie RESET (pin 4) to VCC if unused. Bypass CONT (pin 5) to GND with 10nF cap. Add 100nF bypass cap between VCC and GND. Use flyback diode when driving relays or motors.
Genuine TI part. Ships from USA. Fast free US shipping, hassle-free returns, responsive support.
NE555P Precision Timer IC – Texas Instruments 555 Timer – DIP-8 Through-Hole Package
The NE555P is Texas Instruments' classic precision timer IC in a breadboard-friendly DIP-8 package. One of the most popular integrated circuits ever made, the 555 generates accurate time delays or free-running oscillations using just a few external resistors and capacitors. It operates from 4.5 V to 16 V and can sink or source up to 200 mA -- enough to directly drive LEDs, small relays, buzzers, and TTL logic.
⚠️ Important: Do not exceed 16 V on the supply pin (VCC). Always tie the RESET pin (pin 4) to VCC if not used, and bypass the CONT pin (pin 5) with a 10 nF capacitor to ground for stable operation.
⚡ Key Features
- Two Operating Modes: Monostable (one-shot timer) and astable (free-running oscillator)
- Wide Supply Range: 4.5 V to 16 V
- High Output Current: Sinks or sources up to 200 mA
- Flexible Timing: Microseconds to hours, set by external R and C values
- Adjustable Duty Cycle: Independent control of high and low output times
- TTL Compatible: Output directly drives TTL logic at 5 V
- Supply-Independent Timing: Accuracy determined by external components, not supply voltage
- Active-Low Reset: Dedicated RESET pin overrides all other inputs
📐 Specifications
| Manufacturer |
Texas Instruments (TI) |
| Part Number |
NE555P |
| Package |
PDIP-8 (DIP-8 through-hole) |
| Supply Voltage (VCC) |
4.5 V to 16 V |
| Output Current (Sink/Source) |
±200 mA max |
| Timing Range |
Microseconds to hours |
| Timing Accuracy |
1% monostable / 2.25% astable (typical) |
| Temperature Coefficient |
50 ppm/°C (typical, monostable) |
| Supply Current (No Load) |
3–6 mA at 5 V / 10–15 mA at 15 V |
| Output Rise/Fall Time |
100–300 ns (typical) |
| Operating Temperature |
0°C to 70°C |
| Package Dimensions |
Approx. 9.81 × 6.35 mm (0.39 × 0.25 inches) |
📦 What's in the Box
- NE555P Precision Timer IC (DIP-8) -- quantity per selected option
💡 Note: These are genuine, factory-sourced TI (Texas Instruments) NE555P devices.
🔌 Compatible With
- Arduino, Raspberry Pi, and other microcontroller platforms (as external timer/oscillator)
- Standard solderless breadboards and perfboard (0.1" / 2.54 mm pitch)
- TTL and CMOS logic circuits (at appropriate supply voltages)
- Any 4.5 V to 16 V DC power supply
🎯 Typical Applications
- LED flasher / blinker circuits
- Tone generator and buzzer driver
- Pulse-width modulation (PWM) for motor speed or LED brightness control
- Switch debounce circuits
- Timed relay driver
- Missing pulse detector
- Frequency divider
- Precision timing for sensor interfaces
🔧 How It Works
- Monostable Mode (One-Shot): A trigger pulse on pin 2 causes the output to go high for a time set by one resistor and one capacitor. Pulse width = 1.1 × R × C.
- Astable Mode (Oscillator): The timer self-triggers continuously, producing a square wave. Frequency and duty cycle are set by two resistors and one capacitor. Frequency = 1.44 / ((RA + 2RB) × C).
🚀 Quick Setup
- Insert the NE555P into your breadboard with pin 1 (GND) at the bottom-left (notch/dot facing up)
- Connect pin 8 (VCC) to your power supply (4.5–16 V) and pin 1 (GND) to ground
- Tie pin 4 (RESET) directly to VCC
- Connect a 10 nF ceramic capacitor from pin 5 (CONT) to ground
- Wire your timing resistors and capacitor for monostable or astable mode
💡 Tip: Always place a 100 nF (0.1 µF) ceramic bypass capacitor as close as possible between VCC (pin 8) and GND (pin 1) to decouple the power supply and prevent erratic behavior.
⚠️ Important Notes
- Do not exceed 16 V on VCC -- exceeding this can permanently damage the IC
- Input voltages on CONT, RESET, THRES, and TRIG must not exceed VCC
- When driving inductive loads (relays, motors), always use a flyback diode (e.g., 1N4148 or 1N4007) to protect the IC
- The NE555P draws several milliamps of quiescent current -- for battery-powered applications, consider the CMOS version (TLC555 or ICM7555)
- Follow standard ESD handling precautions -- avoid touching the pins directly
- Verify pin 1 orientation before applying power -- inserting the chip backwards can destroy it
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