A1458 Optocoupler Datasheet May 2026

In switch-mode power supplies (SMPS), the output voltage must be regulated. The A1458 can sit on the secondary (output) side and send a feedback signal to the primary (input) side controller to adjust the duty cycle, maintaining stable voltage without creating a ground loop.

The core of the A1458 optocoupler datasheet is the table of electrical characteristics measured at Ta = 25°C (unless otherwise noted).

Before trusting the A1458 datasheet, perform this 30-second test: a1458 optocoupler datasheet

If the output only drops to 1.5V, the A1458 has a damaged phototransistor or a false datasheet.

The A1458 optocoupler datasheet often includes reference circuits. Here are two common ones. In switch-mode power supplies (SMPS), the output voltage

Several sources provide the official PDF document:

Distributors:

| Parameter | Symbol | Min | Max | Unit | |----------------------------|--------|------|-------|-------| | Forward current (LED) | IF | - | 50 | mA | | Reverse voltage (LED) | VR | - | 6 | V | | Collector-emitter voltage | VCEO | - | 80 | V | | Emitter-collector voltage | VECO | - | 7 | V | | Collector current | IC | - | 50 | mA | | Total power dissipation | Ptot | - | 150 | mW | | Isolation voltage (1 min) | VISO | - | 5000 | Vrms | | Operating temperature | Topr | -55 | +110 | °C | | Storage temperature | Tstg | -55 | +125 | °C | If the output only drops to 1

The standard DIP-4 pinout is as follows:

Mechanical Note: The distance between the LED and phototransistor inside the A1458 is precisely controlled to ensure a CTR consistency of ±20% from batch to batch.

In industrial environments, long signal cables act as antennas, picking up noise. By converting the electrical signal to light and back to electricity, the A1458 filters out almost all electromagnetic interference (EMI), ensuring a clean signal reaches your logic board.

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In switch-mode power supplies (SMPS), the output voltage must be regulated. The A1458 can sit on the secondary (output) side and send a feedback signal to the primary (input) side controller to adjust the duty cycle, maintaining stable voltage without creating a ground loop.

The core of the A1458 optocoupler datasheet is the table of electrical characteristics measured at Ta = 25°C (unless otherwise noted).

Before trusting the A1458 datasheet, perform this 30-second test:

If the output only drops to 1.5V, the A1458 has a damaged phototransistor or a false datasheet.

The A1458 optocoupler datasheet often includes reference circuits. Here are two common ones.

Several sources provide the official PDF document:

Distributors:

| Parameter | Symbol | Min | Max | Unit | |----------------------------|--------|------|-------|-------| | Forward current (LED) | IF | - | 50 | mA | | Reverse voltage (LED) | VR | - | 6 | V | | Collector-emitter voltage | VCEO | - | 80 | V | | Emitter-collector voltage | VECO | - | 7 | V | | Collector current | IC | - | 50 | mA | | Total power dissipation | Ptot | - | 150 | mW | | Isolation voltage (1 min) | VISO | - | 5000 | Vrms | | Operating temperature | Topr | -55 | +110 | °C | | Storage temperature | Tstg | -55 | +125 | °C |

The standard DIP-4 pinout is as follows:

Mechanical Note: The distance between the LED and phototransistor inside the A1458 is precisely controlled to ensure a CTR consistency of ±20% from batch to batch.

In industrial environments, long signal cables act as antennas, picking up noise. By converting the electrical signal to light and back to electricity, the A1458 filters out almost all electromagnetic interference (EMI), ensuring a clean signal reaches your logic board.

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