: Many variants (like the Broadcom version) are hermetically sealed in SOP-8 packages to protect internal components from moisture and environmental contaminants, crucial for military or aerospace use. Low Power Requirement : Designed for low input forward current ( cap I sub cap F )—typically
: It provides critical electrical insulation (typically up to 3750Vrms to 5000Vrms depending on the specific package variation) to protect sensitive digital circuits from high-voltage spikes and noise.
The input circuit features a high-efficiency Gallium Arsenide (GaAs) Light Emitting Diode (LED). When a forward current ( IFcap I sub cap F
: 3750 Vrms to 5000 Vrms (depending on the specific package and testing standard). Environmental Operating Temperature : Ranges from -40°C to +85°C. Pinout and Package The A1458 is typically housed in an 8-pin SOP (Small Outline Package) DIP-8 package Input Side a1458 optocoupler datasheet
If you want, I can fetch the official manufacturer datasheet PDF and extract exact numeric curves and pin drawings for a specific A1458 part variant — tell me which manufacturer's A1458 you need (or I can search generally).
The A1458 is an 8-pin device, though typically only 6 pins are used for functional connections in single-channel mode. Pin Number Description No Connect (Not internally connected) 2 Input LED Anode 3 Input LED Cathode 4 No Connect (Not internally connected) 5 Detector Ground (0V) 6 VOcap V sub cap O Output Signal (Open Collector) 7 No Connect (Not internally connected) 8 VCCcap V sub cap C cap C end-sub Detector Supply Voltage ( 4. Key Specifications Maximum Propagation Delay: tPLHt sub cap P cap L cap H end-sub tPHLt sub cap P cap H cap L end-sub Common Mode Transient Immunity ( VCMcap V sub cap C cap M end-sub ): Supply Voltage ( VCCcap V sub cap C cap C end-sub ): Isolation Voltage ( VISOcap V sub cap I cap S cap O end-sub ): Input Current (Forward): Typically for proper switching. 5. Typical Applications
operating rails span from , natively accommodating 3.3V and 5V TTL/CMOS logic families without intermediate level-shifting. Pinout Configuration (SOP-8 / DIP-8) : Many variants (like the Broadcom version) are
Do not run any copper traces, power planes, or ground planes underneath the optocoupler body between the input (Pins 1-4) and output (Pins 5-8) sides. Maintain a minimum creepage and clearance distance of at least 7mm to 8mm. Use Bypass Capacitors: Always place a ceramic bypass capacitor between Pin 8 ( VCCcap V sub cap C cap C end-sub ) and Pin 5 ( GNDcap G cap N cap D
If the output only drops to 1.5V, the A1458 has a damaged phototransistor or a false datasheet.
The A1458 is an optoisolator featuring an input LED optically coupled to an integrated high-gain, high-speed photodetector. Unlike traditional phototransistor couplers, the A1458 utilizes a photodiode coupled to a high-gain linear amplifier, allowing for high-speed operation (up to When a forward current ( IFcap I sub
The HCPL-1458 is designed for high-performance signal isolation in demanding environments.
Red Flag: If the A1458 datasheet lacks a derating curve (power vs. ambient temperature), do not use it in high-reliability designs.