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
VCE(sat)cap V sub cap C cap E open paren s a t close paren end-sub ): 0.1V to 0.4V, ensuring efficient switching. 3. Isolation Characteristics Isolation Voltage ( VISOcap V sub cap I cap S cap O end-sub
: Open Collector , allowing for flexible output voltage levels (up to 20V) and easy interfacing with TTL/CMOS logic . Pin Configuration (8-Pin DIP/SO-8)
Safely connecting a 3.3V/5V MCU to high-voltage industrial equipment. a1458 optocoupler datasheet
Electrical characteristics define how the optocoupler performs under normal working conditions ( Input Characteristics Test Conditions Forward Voltage VFcap V sub cap F Reverse Current IRcap I sub cap R Terminal Capacitance Ctcap C sub t Output Characteristics Test Conditions Collector Dark Current ICEOcap I sub cap C cap E cap O end-sub Collector-Emitter Breakdown BVCEOcap B cap V sub cap C cap E cap O end-sub Emitter-Collector Breakdown BVECOcap B cap V sub cap E cap C cap O end-sub Transfer Characteristics Test Conditions Current Transfer Ratio CTRcap C cap T cap R Saturation Voltage
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
Parameter / Feature | Standard A1458 | HCPL-1458 | HCNW1458 :--- | :--- | :--- | :--- | Approx. 100% | Higher than A1458 | Excellent (high gain) Response Speed | Slower (basic) | Faster than A1458 (high-speed logic output) | Very fast (high-speed) Isolation | Standard | Standard | Superior (high-voltage, extended creepage) Common Mode Transient Immunity | Good | Good | Excellent (up to 15kV/μs min) Number of Channels | Single-channel | Single-channel | Dual-channel Operating Temperature | -40°C to +100°C (Standard) | 0°C to 70°C (Guaranteed) | -40°C to +100°C (Wider range) Key Applications | General purpose (LED, relay control) | Switch-mode power supply feedback, digital signal isolation | High-speed data communication, motor drives, automotive The A1458 is an optoisolator featuring an input
) of just , making it an outstanding fit for power-conscious designs or battery-operated systems.
Optocouplers are essential components in modern electronics, providing electrical isolation between low-power control circuits and high-voltage power systems. Among the various options available to engineers, the (often associated with high-performance optoelectronic devices from manufacturers like Broadcom/Avago) stands out for its reliability and speed.
operating rails span from , natively accommodating 3.3V and 5V TTL/CMOS logic families without intermediate level-shifting. Pinout Configuration (SOP-8 / DIP-8) Isolation Characteristics Isolation Voltage ( VISOcap V sub
A good A1458 datasheet will show three standard applications:
If the A1458 is unavailable, the following components are common functional alternatives: : A widely available 10MBd high-speed optocoupler .
Searching for an "A1458 optocoupler datasheet" can sometimes lead to confusion, as the "A1458" marking appears on several different electronic components. A quick search might bring up a PNP transistor like the , which is used for general-purpose amplification and high-speed switching. However, for the vast majority of electronics engineers and hobbyists, the search for the "A1458 optocoupler datasheet" refers to a specific family of high-performance optocouplers manufactured by Avago Technologies (now a part of Broadcom). These are high-speed, logic-output optocouplers designed for robust electrical isolation in demanding digital systems.