HLF555 — Precision Timer IC (NE555 Compatible) | DIP-8
Overview
The HLF555 is a high-precision bipolar timer IC designed for stable timing, oscillation,
modulation and control applications. Fully compatible with the industry-standard NE555, it includes
threshold & trigger comparators, an RS flip-flop and a high-current output stage suitable for monostable,
astable, PWM and PPM modes.
🔧 Ideal for: timing circuits, oscillators, PWM control, automation, LED drivers, and audio generators.
Why HLF555?
The HLF555 combines stable timing performance with excellent drift control, supporting timing intervals from microseconds
to hours using external RC components. With strong ±200 mA output, excellent temperature stability and industry-standard
NE555 pin compatibility, it fits perfectly into modern embedded systems, DIY projects, control circuits and PWM-based designs.
Key Advantages
- ⏱️ High Timing Accuracy — Reliable timing and stable pulse generation.
- 🔄 Multiple Modes — Monostable, astable, PWM, and pulse-position modulation.
- 🔋 4.5V–15V Operation — Works across hobby, industrial, and mixed-voltage circuits.
- ⚡ Strong Output Drive — ±200 mA capability to drive LEDs, buzzers and logic loads.
- 📦 DIP-8 & SOP-8 Packages — Perfect for prototype & production environments.
Technical Specifications
| Parameter | Value / Range | Notes |
|---|---|---|
| Operating Voltage | 4.5V – 15V | Recommended range |
| Max Frequency | 500 kHz+ | Supports high-speed oscillation |
| Output Current | ±200 mA | High drive capability |
| Timing Functions | Astable, Monostable, PWM, PPM | Versatile operation |
| Operating Temperature | −20°C to +70°C | General electronics |
Applications
⏱️ Timing & Delays
Accurate pulse generation using RC networks.
🔊 Audio Oscillation
Tone, beep, and sound generator circuits.
🌐 PWM Motor/LED Control
Brightness, speed, and power control.
📡 Pulse Position Modulation
Advanced modulation & signal shaping.
Design Tips
- Use precision resistors/capacitors for accurate timing intervals.
- Place decoupling capacitors (0.01µF–0.1µF) close to the IC.
- Use a transistor for driving relays or motors beyond current limits.
- Follow classic 555 formulas for predictable operation.
