1458 Optocoupler Datasheet Jun 2026

The serves as the blueprint for this device, detailing how it converts an electrical signal into light, and then back into an electrical signal, providing galvanic isolation between the input and output.

CTR = (I_C / I_F) × 100%

Without a real datasheet, we assume it is similar. The 4N35 is a DIP-6 optocoupler with a base pin (pin 6) for adjusting sensitivity. A generic 1458 (if DIP-4) would lack that base pin. 1458 optocoupler datasheet

Provides a high dielectric withstand voltage of 5300 Vrms , ensuring safety between input and output stages.

Acting as a feedback element to maintain regulation while keeping the primary and secondary sides electrically separate. The serves as the blueprint for this device,

Provides excellent immunity against fast voltage transients (noise), critical for motor drives and power supplies. Technical Specifications

When the 24V signal is HIGH, the LED turns on, the phototransistor conducts, pulling the microcontroller pin LOW (active low). When the signal is LOW, the phototransistor is off, and the pull-up resistor makes the microcontroller pin HIGH. A generic 1458 (if DIP-4) would lack that base pin

Sensor voltage = 24V. Optocoupler LED forward voltage (V_F) = 1.2V. Desired I_F = 15mA. R1 = (Vsupply - V_F) / I_F R1 = (24V - 1.2V) / 0.015A = 1520Ω → Use (standard value). Power = I²R = (0.015)² × 1500 = 0.337W → Use 0.5W resistor.

Measured in Vrms or Vdc. For household electronics, 3750Vrms is common. For medical or industrial, look for 5000Vrms. This is not a working voltage but a 1-second withstand rating.