When a forward current (IF) is applied to the input LED (Anode to Cathode), it emits infrared light. This light crosses the isolation barrier and strikes the photodetector, which activates the output transistor, pulling the output voltage (VO) low. When the input current stops, the output transistor turns off, and the output is pulled high via an external pull-up resistor.
: Minimum immunity of 15 kV/µs to 50 kV/µs at high transient voltages, preventing spurious logic states in noisy environments. Operating Voltage ( VCCcap V sub cap C cap C end-sub
(often referred to by its full part number HCPL-A1458 ) is a high-speed logic gate optocoupler manufactured by Broadcom (formerly Avago/Agilent). Designed for high-performance industrial and digital logic isolation, it is frequently used to protect low-voltage microprocessors from high-voltage transients in electrically "noisy" environments. 1. Key Technical Specifications a1458 optocoupler datasheet
The A1458 optocoupler is a workhorse in the electronics industry, offering a perfect balance of isolation voltage and switching reliability. Whether you are building a DIY home automation system or a professional industrial controller, understanding the specs in the A1458 datasheet ensures your circuit remains safe and efficient.
Signal isolation for IGBT/MOSFET drivers. Switch Mode Power Supplies (SMPS): Feedback loop isolation. When a forward current (IF) is applied to
| Parameter | Symbol | Value | Unit | Condition/Note | | :--- | :--- | :--- | :--- | :--- | | | IF | 20 (Max) | mA | DC Input current | | Forward Voltage | VF | 1.3 (Typ) / 1.7 (Max) | V | IF = 10 mA | | Peak Transient Current | IF(trans) | 1 | A | Pulse width ≤ 1 µs | | Supply Voltage (Output) | VCC | 4.5 - 5.5 (Recommended) | V | -- | | Output Supply Voltage Range | VCC | 0 - 20 | V | Absolute Maximum rating | | Output Current | IO | 8 (Max) | mA | -- | | High Level Output Current | IOH | -0.4 to -8 | mA | -- | | Low Level Output Current | IOL | 8 | mA | -- | | Data Rate | -- | 50 (Max) | MBd | -- | | Propagation Delay (tPLH) | -- | 45 (Max) | ns | -- | | Propagation Delay (tPHL) | -- | 45 (Max) | ns | -- | | Current Transfer Ratio (CTR) | -- | 15% to 30% | % | -- | | Isolation Voltage (Withstand) | VISO | 5000 (Min) | Vrms | -- | | Common Mode Rejection (CMR) | | 15,000 (Min) | V/μs | For HCPL-1458 | | Operating Temperature | TA | -40 to +100 | °C | -- | | Storage Temperature | TSTG | -55 to +125 | °C | -- | | Lead Solder Temperature | -- | 260 | °C | For 10 sec (DIP package) |
) of depending on test configurations and sub-variants, enabling crisp high-frequency data transmission. Isolation Voltage Capacity ( VISOcap V sub cap I cap S cap O end-sub ): Rated up to 3,750 VRMScap V sub cap R cap M cap S end-sub VRMScap V sub cap R cap M cap S end-sub : Minimum immunity of 15 kV/µs to 50
Isolating low-voltage MCUs from high-voltage power stages to prevent damage from spikes. Industrial Systems:
Offers robust voltage isolation between the input and output stages (typically rated up to 2,500V RMS or higher depending on the specific package variant).
Optimized for digital signal transmission with minimal delay (35 ns at 10 kHz in some configurations).
Allowing a 3.3V or 5V MCU to trigger a 24V industrial relay or motor driver without risking a "blowback" of current.