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NE555DR

Precision timer IC, 4.5-16V, ±200mA output, mono/astable, SOIC-8

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Manufacturer Part：

NE555DR

Package：

SOIC-8 (3.9 x 4.9 x 1.25mm)

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Description

Product Overview

The NE555DR from Texas Instruments is a precision single timer IC in an SOIC-8 package capable of producing accurate time delays or oscillation. In monostable mode, the timed interval is controlled by a single external resistor and capacitor network. In astable mode, the frequency and duty cycle are independently controlled with two external resistors and a single capacitor.

Key Specifications

Supply Voltage 4.5V to 16V (operating), up to 18V absolute max
Output Current ±200mA (sink or source)
Timing Range Microseconds to Hours
Trigger Threshold 1/3 VCC
Threshold Level 2/3 VCC
Supply Current (VCC=5V) 3mA typ.
Supply Current (VCC=15V) 10mA typ.
Initial Timing Error 1% typ. (monostable)
Temperature Coefficient 50 ppm/°C typ.
Output Rise Time 100ns typ.
Output Fall Time 100ns typ.
Package SOIC-8 (3.9 x 4.9mm)
Operating Temperature 0°C to +70°C

Features

  • Timing from microseconds to hours
  • Astable or monostable operation
  • Adjustable duty cycle
  • TTL-compatible output, can sink or source up to 200mA
  • Adjustable threshold and trigger levels via CONT pin
  • Active-low reset overrides all other inputs
  • Open-drain discharge transistor for timing capacitor
  • Wide supply voltage range: 4.5V to 16V

Applications

  • Precision timing and pulse generation
  • LED flashers and PWM controllers
  • Tone and frequency generation
  • Time delay circuits
  • RFID reader and biometric systems

The NE555DR from Texas Instruments is the industry-standard precision single timer in an SOIC-8 package. It can be configured for monostable (one-shot) or astable (free-running) operation, producing timing intervals from microseconds to hours. The output can sink or source up to 200mA and is TTL-compatible when operating from a 5V supply. The threshold and trigger levels are internally set at 2/3 and 1/3 of VCC respectively, but can be adjusted via the control voltage pin.

The NE555 contains two comparators, a set-reset flip-flop, a discharge transistor, and a resistive voltage divider network (three 5kΩ resistors creating 1/3 and 2/3 VCC references). In monostable mode, a falling edge on the TRIG pin (below 1/3 VCC) sets the flip-flop, driving the output high and turning off the discharge transistor, allowing the external timing capacitor to charge through the external resistor. When the capacitor voltage reaches 2/3 VCC (THRES pin), the flip-flop resets, the output goes low, and the discharge transistor turns on to rapidly discharge the capacitor. In astable mode, the capacitor charges and discharges between 1/3 and 2/3 VCC through two external resistors.

Pin Name Type Function
1 GND Power Ground reference
2 TRIG Input Trigger input (active below 1/3 VCC)
3 OUT Output Output (sink or source up to 200mA)
4 RESET Input Active-low reset (overrides all inputs)
5 CONT I/O Control voltage (adjusts threshold/trigger)
6 THRES Input Threshold input (active above 2/3 VCC)
7 DISCH Output Open-collector discharge transistor
8 VCC Power Supply voltage (4.5V to 16V)
  • Precision time-delay generation for industrial sequencing
  • LED flasher and strobe light circuits
  • PWM motor speed control with adjustable duty cycle
  • Tone and frequency generation for alarms and sirens
  • RFID and biometric system timing
Manufacturer Part Number Package Notes
TI NE555P PDIP-8 Through-hole version
TI SA555DR SOIC-8 Industrial temp (-40°C to +85°C)
TI LMC555CM SOIC-8 CMOS version, low power (100μA)
onsemi MC1455DR2G SOIC-8 Pin-compatible 555 timer
ST NE555D SOIC-8 Pin-compatible equivalent
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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