A1458 Optocoupler Datasheet May 2026

CTR is the gain of an optocoupler: (I_C / I_F) * 100%. The A1458 offers multiple rank options:

| Rank | CTR Min (%) | CTR Max (%) | Conditions | |------|-------------|-------------|-------------| | A | 50 | 150 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | B | 80 | 240 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | C | 130 | 400 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | D | 200 | 600 | I_F = 5 mA, V_CE = 5V, Ta=25°C |

Selecting CTR rank: For digital logic interfaces (e.g., 5V to 3.3V), ranks A or B are sufficient. For analog applications or low I_F drive (e.g., 1 mA from a battery-powered MCU), ranks C or D provide higher sensitivity. a1458 optocoupler datasheet

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. CTR is the gain of an optocoupler: (I_C / I_F) * 100%

The A1458 is a general-purpose, single-channel optocoupler consisting of a Gallium Arsenide (GaAs) infrared emitting diode optically coupled to a silicon NPN phototransistor. It is packaged in a compact 4-pin DIP (Dual In-line Package) with surface-mount (SMD) option available.

The A1458 optocoupler datasheet often includes reference circuits. Here are two common ones. Before trusting the A1458 datasheet, perform this 30-second

Several sources provide the official PDF document: