H11A1

Overview

The H11A1 is a single-channel optocoupler featuring an infrared LED and a phototransistor with base output, housed in a 6-pin PDIP package. It provides 5000Vrms isolation voltage. The device operates within a temperature range of -40°C to 100°C. Key electrical parameters include a maximum forward voltage of 1.2V, a minimum current transfer ratio of 50% at 10mA input current, and rise/fall times of 2.8µs and 4.5µs respectively. It supports AC input applications and complies with UL1577 standards.

Feature Summary

• Phototransistor output with accessible base terminal for enhanced control
• High isolation voltage rating of 5000Vrms for safety
• Wide operating temperature range suitable for industrial environments

Applications

• Industrial control systems requiring galvanic isolation
• AC line sensing circuits
• General-purpose signal isolation in electronic equipment

Procurement Notes

Verify the manufacturer source carefully as multiple vendors produce this component. Confirm the specific isolation voltage rating (5000Vrms vs 7500Vrms variants) matches your design requirements. Check for RoHS compliance status if required by your project specifications. Ensure the package type corresponds exactly to your PCB footprint needs.

Selection Notes

Select this component when a base-connected phototransistor is needed for faster switching or linear operation compared to standard outputs. Consider the 5000Vrms isolation limit against your system's transient voltage requirements. Evaluate the 100°C maximum junction temperature against your thermal management strategy. Compare current transfer ratio specifications with other available optocouplers for adequate drive margin.

Part Context

The H11A1 belongs to the general-purpose optocoupler family, widely used for basic isolation tasks. It differs from higher-speed or logic-output variants by its analog-friendly phototransistor structure. This part serves as a cost-effective solution for non-critical isolation where moderate speed is acceptable. It is often cross-referenced with similar DIP-6 packages from other manufacturers.

Replacement Considerations

H11AA1M is a related variant with different isolation ratings. Verify pinout compatibility before substitution. Other generic DIP-6 optocouplers may require verification of CTR and isolation voltage equivalence.