NE556 Dual Timer IC (DIP)

Overview

The NE556 Dual Timer IC (DIP) integrates two independent NE555 timer circuits into one compact package. It is a reliable, space-saving solution for generating precise time delays, pulse-width modulation (PWM) signals, and stable square wave oscillations. Each timer operates independently while sharing a common power supply, making the device ideal for projects that require dual-timer functionality without increasing board footprint.

Key Features

• Dual NE555 timer circuits in one IC
• Operates in monostable and astable modes
• Adjustable time delays and PWM duty cycle
• Wide operating voltage: 4.5 V to 16 V
• High output current drive for driving LEDs, relays, and small motors
• DIP package for easy prototyping on breadboards and PCBs
• Stable performance across temperature variations

Technical Specifications

• Timer type: Dual NE555 equivalents
• Package: Dual In-line Package (DIP)
• Supply voltage: 4.5 V to 16 V
• Operating modes: Monostable (one-shot), Astable (oscillator)
• Output: TTL/CMOS compatible drive with high source/sink current capability
• Typical applications: timing, PWM, oscillators, tone generation

Typical Applications

• LED flashers and sequential light controllers
• PWM control for motor speed and dimming
• Frequency generators and tone generation circuits
• Time delay relays and one-shot timer circuits
• Educational circuits, prototyping, and industrial control

How to Use the NE556

Each timer in the NE556 can be configured independently. Common setups include:

• Astable mode for continuous square wave generation: use two resistors and a capacitor to set frequency and duty cycle.
• Monostable mode for single pulse generation: trigger input with a capacitor and resistor to set pulse width.
• PWM applications: vary control voltage or resistor values to adjust duty cycle for motor speed or LED brightness control.

Design Tips

• Bypass the supply rails with a 0.01 uF to 0.1 uF capacitor close to the IC to improve stability.
• Use timing capacitors with low leakage for accurate long time constants.
• Keep output traces short when driving inductive loads and add flyback protection for motors and relays.

Package and Prototyping

The DIP package makes the NE556 ideal for breadboard experimentation and easy insertion into standard PCBs. Its pinout mirrors two standard NE555 timers, simplifying upgrades from single-timer designs to dual-timer implementations.

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