The LED's light output declines over time (LOP). To ensure a 10-year product life:
The isolation barrier is the primary reason to use the A1458. The datasheet provides the following isolation parameters: a1458 optocoupler datasheet
Operates efficiently with low forward currents, making it directly compatible with CMOS and TTL logic circuits. The LED's light output declines over time (LOP)
The A1458 is an optically coupled isolator consisting of a GaAsP LED and an integrated high-gain photodetector. It is designed for high-speed logic gate isolation and is commonly used in industrial and telecommunication environments to provide galvanic isolation while maintaining signal integrity. Specification Speed (Propagation Delay) 8 ns max (tPHL/tPLH) Isolation Voltage Supply Voltage (VCC) 3.0V to 5.5V Common Mode Rejection (CMR) 50 kV/µs minimum Current Consumption (ICC) 1.2 mA max (Low power) Operating Temperature -40°C to +105°C (Extended range) Package Types 8-Pin DIP, SOIC-8 / SOP-8 Core Features The A1458 is an optically coupled isolator consisting
Optocouplers have a "Rise Time" and "Fall Time." If you are sending high-speed PWM signals (above 10kHz), check the datasheet for the switching speed to ensure the signal doesn't become distorted.
The HCPL-A1458 is typically housed in a small, compact 8-pin DIP (Dual In-line Package) or SOIC (Small Outline Integrated Circuit) package, designed to optimize board space. Input LED side. Cathode: Input LED side. NC (No Connection): Often unused. NC (No Connection): Often unused. GND (Ground): Output detector side. VOUTcap V sub cap O cap U cap T end-sub (Output): Logic output. VEcap V sub cap E (Enable): Enables/Disables output. VCCcap V sub cap C cap C end-sub (Supply Voltage): Output detector side supply.
To ensure the best performance from the HCPL-A1458, designers should consider the following, as found in standard datasheet application notes: Always connect a ceramic capacitor close to the VCCcap V sub cap C cap C end-sub