Vishay LH1546AEF Optocoupler, Surface Mount, 4-Pin SMD, MOSFET Output, 1 Channel, 1.45V Forward Voltage LH1546AEF

The Vishay LH1546AEF optocoupler is a robust surface mount device with a 4-pin SMD package designed primarily for telecom and ground fault detection applications. Featuring a single-pole single-throw (SPST) normally open switch, it uses a gallium aluminum arsenide (GaAlAs) LED for input actuation and MOSFETs for the output switching stage. This solid-state relay effectively replaces traditional electromechanical relays offering higher reliability and longer life.

The device incorporates current limiting circuitry that provides protection against overvoltage conditions, enhancing its durability in demanding industrial environments. It is rated for a maximum forward voltage of 1.45 V and maximum input current of 50 mA, facilitating efficient control signals. The typical on-state resistance (RON) is approximately 28 ohms, ensuring low power dissipation during operation.

The isolation test voltage rate is rated at 3750 VRMS with a maximum isolation voltage of 5.3 kVrms, supporting high-voltage separation between input and output circuits. With typical rise and fall times of 0.2 ms and 0.05 ms respectively, the LH1546AEF supports fast switching required in telecom and instrumentation systems.

Operating reliably over a temperature range from -40°C up to 85°C, it complies with UL1577 standards and is suitable for industrial control, instrumentation, and general telecom switching applications. The product is supplied in tape and reel packaging optimized for automated surface mount assembly lines.

Single channel SPST normally open solid-state switch. GaAlAs LED input with MOSFET output for high reliability. Current limiting circuit for robust overvoltage protection. Isolation voltage up to 5.3 kVrms for safe electrical separation.

Low on-state resistance and fast switching times. Wide operating temperature range suitable for industrial use. Complies with UL1577 certification for safety and reliability. Delivered in tape & reel packaging for automated assembly.

Ideal replacement for electromechanical relays in telecom and instrumentation.

This Vishay optocoupler is an excellent choice for industrial, telecom, instrumentation, and control system applications requiring dependable solid-state relay switching. Browse more Vishay Optocouplers and related electronic components for robust system designs.