1458 Optocoupler Datasheet _top_ -
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Standard optocouplers like the 4N35 are slow (µs range). They cannot pass high-speed data (e.g., I²C at 400 kHz or SPI at 10 MHz). For high speed, use dedicated logic optocouplers (e.g., 6N137).
): Operates within a range of , making it compatible with standard TTL and CMOS logic levels.
: Protecting microcontrollers from high-voltage spikes and ground loops. 1458 optocoupler datasheet
High CMR indicates that the device can successfully reject transient noise spikes between the input and output grounds without triggering false outputs. 5. Typical Application Circuits Circuit 1: Microcontroller Interfacing (Logic Isolation)
35 ns (typical) at 10 kHz, making it suitable for high-data-rate communication. Output Type:
Providing isolated feedback in switching power supplies. : Standard optocouplers like the 4N35 are slow (µs range)
Non-connected (NC) pins or secondary grounds depending on specific packaging sub-variants.
Datasheets for the HCPL-1458 typically highlight its ability to operate at high speeds with minimal power requirements.
This comprehensive guide breaks down the essential technical details found in a standard 1458 optocoupler datasheet, detailing its internal architecture, electrical characteristics, pinout configuration, and practical application circuits. 1. What is the 1458 Optocoupler? ): Operates within a range of , making
When a forward current flows through the input LED, it emits infrared light. This light spans the internal isolation gap and strikes the base-collector junction of the adjacent phototransistor. The photons generate electron-hole pairs, inducing a base current that switches the transistor into a conductive state. Because the connection is purely optical, there is no electrical path between the input and output terminals. Pin Configuration and Package Styles
Before diving into the datasheet, let's quickly cover what an optocoupler (also known as an opto-isolator) is. An optocoupler is a component that allows two isolated circuits to communicate with each other through light. It consists of an LED (light-emitting diode) and a photodetector (such as a phototransistor or photodiode) separated by a dielectric material.
A 3.3V GPIO cannot drive a 24V industrial PLC input. Use an optocoupler:
The 4N35 works, but only if I_F is properly chosen. The non-existent "1458 optocoupler" would require the same analysis.