A1458 Optocoupler Datasheet [portable] May 2026

The A1458 optocoupler is a workhorse in the electronics industry, offering a perfect balance of isolation voltage and switching reliability. Whether you are building a DIY home automation system or a professional industrial controller, understanding the specs in the A1458 datasheet ensures your circuit remains safe and efficient.

Why choose the A1458 over a standard transistor? Here are the most common use cases:

Used in the feedback loop to regulate output voltage while keeping the high-voltage AC side isolated from the DC output. a1458 optocoupler datasheet

By converting the electrical signal to light and back again, the A1458 ensures that there is no physical connection between the input and output. This prevents "ground loops" and protects low-voltage microcontrollers (like an Arduino or STM32) from high-voltage transients. Key Specifications (Datasheet Summary)

): Typically 2,500 to 5,000 Vrms. This is the "survival" rating for the gap between input and output. The A1458 optocoupler is a workhorse in the

In environments with heavy machinery, electromagnetic interference (EMI) can ruin data signals. The A1458 "cleans" the signal by transmitting it via light.

In the world of electronics, protecting sensitive control circuits from high-voltage spikes is a top priority. One of the most reliable ways to achieve this isolation is through an optocoupler. While many engineers are familiar with the standard 4N25 or PC817 series, the (often part of the HCPL-1458 or similar proprietary series) is a specialized component designed for specific industrial and signal-processing tasks. Here are the most common use cases: Used

VCE(sat)cap V sub cap C cap E open paren s a t close paren end-sub ): 0.1V to 0.4V, ensuring efficient switching. 3. Isolation Characteristics Isolation Voltage ( VISOcap V sub cap I cap S cap O end-sub