Datasheet — 1458 Optocoupler

), which reduces the power consumption of the driving circuit. Hermetic Packaging : Typically housed in an SOP-8 hermetically sealed package

The PC1458 is an optically coupled isolator consisting of a Gallium Arsenide (GaAs) infrared emitting diode (IRED) optically coupled to a silicon phototransistor detector. It is housed in a standard 4-pin DIP (Dual In-line Package).

The HCPL-1458 series is frequently used in industrial and high-reliability sectors:

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).

Range: Can typically operate across a broad spectrum of supply voltages, enhancing design flexibility.

A competent datasheet analysis must cover six mandatory sections:

By default, Pin 6 (the base) is left disconnected. However, standard phototransistors suffer from storage time delays because charges get trapped in the base region. To achieve faster turn-off times ( tofft sub o f f end-sub Connect a between Pin 6 (Base) and Pin 4 (Emitter).

3.0V to 5.5V, offering flexibility for both 3.3V and 5V logic systems. Propagation Delay:

: Provides high isolation voltage, typically around 5300 Vrms , and high common-mode transient immunity (CMR) of 50 kV/µs .

Connect a current-limiting resistor to the (Pin 1) to set the correct input current from your microcontroller. Connect the Cathode (Pin 2) to your input ground. Connect VCCcap V sub cap C cap C end-sub

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