1458 Optocoupler Datasheet Guide

| Parameter | Symbol | Typical Value | Unit | Conditions | |-----------|--------|---------------|------|------------| | Forward Current (IF) | IF | 20 | mA | IF = 20 mA, VF = 1.2 V | | Forward Voltage (VF) | VF | 1.2 | V | IF = 20 mA | | Collector‑Emitter Voltage (VCE) | VCE | 80 | V | IC = 0 mA | | Collector Current (IC) | IC | 50 | mA | VCE = 80 V | | CTR (Current Transfer Ratio) | CTR | 100 % ± 20 % | % | IF = 20 mA, VCE = 5 V | | Rise Time (tr) | tr | 3 | µs | IF = 20 mA | | Fall Time (tf) | tf | 3 | µs | IF = 20 mA | | Isolation Voltage | VISO | 5000 | Vrms | 1 min, 60 Hz | | Operating Temperature Range | TOP | –40 to +85 | °C | – | | Storage Temperature Range | TS | –55 to +150 | °C | – |

Subject: Identification and Technical Analysis of the "1458" Component in Optocoupler Contexts Date: October 26, 2023 Status: Identification Required

Imagine you found a scrap optocoupler labeled "1458" (maybe a counterfeit or house number). How do you test it?

You need: A multimeter, a 5V power supply, a 330-ohm resistor, a 10k resistor, and an LED. 1458 optocoupler datasheet

Procedure:

If this works, your "1458 optocoupler" behaves exactly like a 4N35.

The 1458 optocoupler is a robust component essential for noise reduction and safety in circuit design. By understanding the datasheet parameters—specifically Forward Voltage, CTR, and Isolation Voltage—you can safely implement it in your designs to bridge the gap between low-power logic and high-power peripherals. | Parameter | Symbol | Typical Value |

Just remember to double-check that you haven't accidentally picked up a 1458 Op-Amp!

Have you used this component in a project? Are you having trouble identifying a specific marking? Drop a comment below with a photo or description!

Since no "1458 optocoupler" exists, we analyze the widely available 4N35 from Vishay or ON Semiconductor. Subject: Identification and Technical Analysis of the "1458"

Assuming your "1458" component is a standard 4-pin DIP package (the most common form factor for simple switching), the pinout is as follows:

Looking from the top (with the notch/dot facing up):

Note: If your chip has 6 pins (like a 4N35), Pins 3, 4, 5, and 6 correspond to the Base, Collector, and Emitter. Always check the physical datasheet if possible.