If the part physically has "A1458" printed on it:
This datasheet is for informational purposes. Verify specifications with original component supplier before design-in.
The HCPL-A1458 (also referred to as the A1458) is a high-speed, high-gain logic gate optocoupler manufactured by Broadcom (formerly Avago). It is designed for applications requiring precise signal isolation and high noise immunity, such as driving power transistors (IGBTs/MOSFETs) or managing high-speed digital communications. Key Specifications Typical Specification Data Rate Up to 50 MBd (high-speed logic performance) Propagation Delay 20 ns (typical); max delay typically around 8 ns to 35 ns Supply Voltage ( VCCcap V sub cap C cap C end-sub ) 3.0 V to 5.5 V (supports both 3.3V and 5V logic) Isolation Voltage 3750 Vrms to 5000 Vrms (depending on package/option) Output Type Open Collector (TTL compatible) Common Mode Rejection Min 15,000 V/µs (up to 50 kV/µs in some variants) Operating Temperature -40°C to +85°C (industrial grade) Common Applications
The A1458 is frequently used in environments with high electrical noise where safe isolation between low-voltage control signals and high-voltage power stages is critical:
Industrial Power: Used in solar and wind turbine inverters, motor drive inverters, and Variable Frequency Drives (VFDs).
Power Supplies: Acts as a bridge for feedback in Switch-Mode Power Supplies (SMPS) and Uninterruptible Power Supplies (UPS).
Communications: Provides ground isolation for high-speed digital logic (TTL/CMOS) and line receivers. Pin Configuration (SOP-8 Package)
While specific pinouts can vary by sub-model, a standard high-speed 8-pin optocoupler typically follows this structure: Pin 1 & 4: NC (No Connection) or specific bias pins. Pin 2: Anode (+) of the internal LED. Pin 3: Cathode (-) of the internal LED. Pin 5: GND (Ground). Pin 6: VOcap V sub cap O (Output voltage). Pin 7: VEcap V sub cap E (Enable) or NC. Pin 8: VCCcap V sub cap C cap C end-sub (Supply voltage). HCPL-1458/ A1458 - Broadcom - Price, Inventory & Datasheets a1458 optocoupler datasheet
The A1458 (HCPL-A1458) is a specialized high-speed optocoupler designed to provide galvanic isolation for IGBT and Power MOSFET gate driving in industrial motor drives and power supplies. Featuring an open-collector output, it offers 35 ns propagation delay and a robust operating range of -40°C to +100°C for high-noise environments. Technical specifications can be reviewed in the datasheet from Farnell. HCPL-A1458 | In Stock - utsource
The A1458 (also identified as the HCPL-1458 or HCPL-A1458) is a high-speed, high-gain optocoupler manufactured primarily by Avago Technologies (now Broadcom Limited). It is designed to provide high-speed signal isolation and is often used as a gate driver for power transistors like IGBTs and MOSFETs in industrial environments. Key Technical Specifications
The following characteristics are typical for the HCPL-A1458 series: Supply Voltage ( VCCcap V sub cap C cap C end-sub
): Typically 3.0V to 5.5V or 4.5V to 5.5V, offering flexibility for different logic levels.
Propagation Delay: Very low, often rated at approximately 35 ns to 45 ns, making it suitable for high-speed digital data rates up to 15 Mbps. Isolation Voltage ( Visocap V sub i s o end-sub
): High safety rating of 3750 Vrms to 5300 Vrms, ensuring protection between low-voltage control and high-voltage power stages.
Common Mode Transient Immunity (CMR): High noise immunity, typically 15 kV/µs to 50 kV/µs, essential for preventing false triggers in noisy industrial settings. If the part physically has "A1458" printed on it:
Input/Output: Features a GaAsP LED input and an integrated high-gain photodetector with an open collector output. Common Applications
Motor Drives: Used in industrial motor drive inverters for speed and torque control.
Renewable Energy: Integrated into solar and wind turbine inverters.
Power Supplies: Common in Switch-Mode Power Supplies (SMPS) to isolate control signals from high-voltage rails.
Microcontroller Interfacing: Protects sensitive MCUs from voltage spikes and noise while communicating with external hardware. Packaging Information
The device is widely available in surface-mount SOP-8 or SOIC-8 packages, as well as 8-pin DIP formats for through-hole mounting. Some high-reliability versions are hermetically sealed for use in aerospace or harsh industrial environments. HCPL-1458/ A1458 - Broadcom - Price, Inventory & Datasheets
Scenario: Isolating a 24V PLC output to a 3.3V microcontroller input. This datasheet is for informational purposes
Components:
Operation: When PLC output is high (24V), LED turns on, phototransistor conducts, output pin pulled low. When PLC output low, LED off, output pulled high by R2.
The isolation barrier is the primary reason to use the A1458. The datasheet provides the following isolation parameters:
| Parameter | Symbol | Conditions | Value | Unit | |-----------|--------|-------------|-------|------| | Isolation Voltage | V_ISO | Ta=25°C, 60Hz, 1 sec | 5,000 | Vrms | | Isolation Resistance | R_IO | V_IO = 500V | 10^12 (min) | Ω | | Isolation Capacitance | C_IO | V_IO = 0V, f=1MHz | 0.8 (typ) | pF |
Certifications: Many A1458 variants carry UL 1577, VDE 0884 (reinforced insulation), and CSA approvals. Always check the specific datasheet for regulatory marks if your design requires safety certification.
Page 3 of the official a1458 optocoupler datasheet usually contains a "Test Circuit" diagram. Here is the standard configuration for digital signal isolation:
Schematic Walkthrough: