1458 | Optocoupler Datasheet

When the phototransistor turns off, the inductive coil inside the relay will collapse, producing a high-voltage back-EMF spike. Always place a flyback diode (such as a standard ) in parallel with the relay coil to protect Pin 5 ( VCEOcap V sub cap C cap E cap O end-sub ) from exceeding its 30V limit.

Among the sea of component numbers, "1458" appears frequently in search queries and parts lists. However, there is a critical distinction to make immediately: This confusion is common. Therefore, this article serves two purposes:

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Always refer to the manufacturer's official documentation for exact electrical characteristics, absolute maximum ratings, and temperature derating curves. Next Steps for Your Project 1458 optocoupler datasheet

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) accurately using Ohm's Law. Driving the LED too hard can degrade its lifespan, while under-driving it may cause unreliable switching. Final Thoughts

Features a Silicon NPN Phototransistor. When the infrared light strikes the base-collector junction of this phototransistor, it generates a current, allowing electrical conduction across the output terminals. When the phototransistor turns off, the inductive coil

Protecting sensitive digital controllers from high-voltage noise in industrial machinery.

Key identifying characteristics of this family include:

: For high-speed digital isolation, these are the most critical specs. However, there is a critical distinction to make

: Commonly available in a compact SOP-8 or SOIC package style. Pin Configuration (Standard SOP-8) While pinouts can vary by manufacturer, the typically follows this configuration: Input Pins : Dedicated to the LED power supply and ground.

Logic signal output pin (Typically Open-Collector or Logic Gate) VEcap V sub cap E No connection or enable function (variant dependent) Pin 8 VCCcap V sub cap C cap C end-sub Positive supply voltage for output circuit bias Note: Datasheets recommend placing a