A1458 Optocoupler Datasheet Jun 2026

Ensures that TTL/CMOS logic signals are not disrupted by ground loops or noise.

Features a logic gate output, making it directly compatible with TTL and CMOS systems.

The A1458 is most commonly found in a or an SMD equivalent. Pin 1: Anode (LED Input) Pin 2: Cathode (LED Input) Pin 3: Emitter (Phototransistor Output) Pin 4: Collector (Phototransistor Output)

Safety Warning: Always verify the specifications in the official manufacturer datasheet before finalizing your design. * Electrical Isolation Warning: The isolation barrier in the A1458 is designed for functional and basic isolation. Do not rely solely on this component for primary side to secondary side separation in medical life-support systems. * a1458 optocoupler datasheet

This is the ratio of output current to input current. For the A1458, this is generally between 50% and 600%, categorized into different "ranks" (e.g., Rank L, Rank A). Pinout Configuration

The (widely documented in component catalogs as the HCPL-1458 or HCPL-A1458 ) is a high-speed, high-performance logic gate optoisolator manufactured by Broadcom (formerly Avago Technologies). Engineered primarily for high-speed signal isolation in rugged industrial or low-voltage systems, this component leverages a hermetically sealed architecture to deliver excellent common-mode transient immunity and stable high-data-rate throughput.

Rin=Vin−VFIFcap R sub i n end-sub equals the fraction with numerator cap V sub i n end-sub minus cap V sub cap F and denominator cap I sub cap F end-fraction Ensures that TTL/CMOS logic signals are not disrupted

While the A1458 excels in high-speed and high-CMR, designers may consider alternatives based on specific needs: Part Number Key Strength HCPL-A1458 1 Ch High Speed Highest CMR (50 kV/μs) & Fast Speed (8 ns) Go to product viewer dialog for this item. 1 Ch High Speed Common alternative in TSR output designs Go to product viewer dialog for this item. 1 Ch High Speed Similar, but widely used in motor drive feedback

The separates high-voltage input lines from low-voltage outputs using an internal short optical path. An AlGaAs infrared light-emitting diode (LED) converts electrical inputs to optical signals, which cross an internal insulating layer to strike an integrated, high-gain photodetector gate. Pin Number Description / Functional Role Pin 1 No Internal Connection (Maintains Creepage Distance) Pin 2 Positive Input for the Transmitting LED Pin 3 Negative Input for the Transmitting LED Pin 4 No Internal Connection Pin 5 Ground Reference for the Output Stage Pin 6 VOUTcap V sub cap O cap U cap T end-sub Open-Collector/Logic Gate Signal Output Pin 7 No Connection or Enable (Package Variant Dependent) Pin 8 VCCcap V sub cap C cap C end-sub

Top-Down View (DIP-8 / SOP-8) +--- ---+ Anode | 1 8 | VCC (Supply Voltage) Cathode | 2 7 | No Connection (NC) NC | 3 6 | VO (Signal Output) NC | 4 5 | GND (Ground Connection) +-------+ Pin 1: Anode (LED Input) Pin 2: Cathode

The isolation barrier is the primary reason to use the A1458. The datasheet provides the following isolation parameters:

Example order code: A1458-B (CTR rank B)

The (often referred to as A1458 ) is a high-speed, single-channel logic gate optocoupler manufactured by Broadcom (formerly Avago). It is designed to bridge the gap between high-speed digital circuits while providing excellent electrical isolation. ⚡ Key Specifications

The is a testament to the idea that simple components can solve complex problems. By understanding the parameters in its datasheet—specifically the isolation voltage and CTR—you can design robust circuits that stand up to high voltages and electrical noise.