H11A1 Transistor Output Optocoupler IC DIP 6 Package

H11A1 Transistor Output Optocoupler IC DIP 6 Package 

The H11A1 is a phototransistor-based optocoupler designed to provide safe electrical isolation between low-voltage control circuits and high-voltage or noisy environments. It contains an infrared LED and an NPN phototransistor inside a 6-pin plastic DIP package.

The H11A1 belongs to the common H11Ax family (H11A1, A2, A3, A4), where the main difference is the CTR (Current Transfer Ratio). The H11A1 offers low CTR, making it useful for fast switching and logic signal isolation where high-speed performance is required.

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Key Features:

• Transistor Output – suitable for driving logic circuits, TTL/CMOS inputs, and low-power loads.
• High Isolation Voltage – typically 5000?Vrms input-to-output isolation.
• Fast Response Time – suitable for digital switching applications.
• DIP-6 Package – convenient for through-hole PCB mounting.
• Low Input Current – efficient and compatible with low-power control circuits.

Advantages

• Good for fast switching applications
• Provides robust electrical isolation
• Suitable for low-voltage digital circuitry
• Easy to interface with logic or microcontrollers
• Reliable and cost-effective
• Lower CTR ? less signal distortion ? more predictable output for logic applications

Applications

• Digital signal isolation
• Microcontroller input/output protection
• Low-frequency switching circuits
• Logic level shifting with isolation
• SMPS and power supply feedback circuits
• Industrial control systems
• Motor control and drive circuits
• AC mains detection (with external components)
• Relay and TRIAC driver isolation
• Noise isolation in sensitive circuits