The unique hermetic sealing and high-gain characteristics of the HCPL-1458 make it suitable for specialized environments:
However, many manufacturers (especially in the relay and industrial control sectors) produce optocouplers housed in "1458" style packages, or use markings similar to date codes (like "Week 14 of 1958") that can be mistaken for part numbers. 1458 optocoupler datasheet
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|------------|-----|-----|-----|------| | Forward voltage | ( V_F ) | ( I_F = 20 mA ) | 1.0 | 1.2 | 1.4 | V | | Reverse current | ( I_R ) | ( V_R = 6 V ) | - | 0.01 | 10 | µA | | Capacitance | ( C_t ) | ( V_R = 0, f = 1 MHz ) | - | 30 | - | pF | The unique hermetic sealing and high-gain characteristics of
: Protecting microcontrollers from high-voltage spikes and ground loops. STMicroelectronics The HCPL-1458 is typically housed in an
(often colloquially called the A1458) manufactured by Avago (now Broadcom). STMicroelectronics
The HCPL-1458 is typically housed in an or DIP-8 package. While specific internal diagrams vary by variant, a standard high-speed 8-pin optocoupler often follows this general layout: