A1458 Optocoupler Datasheet

Why would you choose the A1458 for your next project? Here are three common scenarios:

Why choose the A1458 over alternatives?

| Model | CTR (%) | V_CEO (V) | t_on/t_off (μs) | Isolation (Vrms) | Best For | |-------|---------|-----------|-----------------|------------------|-----------| | A1458 | 50-600 | 80 | 5/4 | 5,000 | General purpose, wide CTR | | PC817 | 50-600 | 35 | 4/3 | 5,000 | SMPS feedback (lower V_CEO) | | 4N35 | 100 (min) | 30 | 10/10 | 5,000 | Hobbyist, older designs | | 6N137 | - (logic) | 7 | 0.075 | 5,000 | High-speed data (10 Mbps) |

Verdict: The A1458 competes directly with the PC817 but often offers a higher V_CEO (80V vs 35V), making it superior for 48V industrial systems or relay drivers.

The A1458 optocoupler datasheet often includes reference circuits. Here are two common ones.

high-speed, single-channel optocoupler (also known as the HCPL-A1458 ) manufactured by Avago/Agilent

. It is designed for applications requiring electrical isolation and high-speed signal transmission, such as industrial control and telecommunications. Key Technical Specifications The following parameters are typical for the Broadcom HCPL-1458 Speed & Performance : Up to 50 MBd (megabaud). Propagation Delay

: Typically 20 ns, with a maximum of 35 ns at specific frequencies. Common Mode Rejection (CMR) : Minimum 15,000 V/μs. Electrical Characteristics Supply Voltage ( cap V sub cap C cap C end-sub

: 3.0 V to 5.5 V, making it compatible with both 3.3V and 5V logic. Output Type : Open collector, supporting voltages up to 20 V. Isolation Voltage ( cap V sub cap I cap S cap O end-sub

: 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

: Contains a GaAsP LED that emits infrared light when current is applied. Output Side

: Features an integrated high-gain photo detector and a logic gate for high-speed switching. Common Applications Industrial Automation

: Used for logic ground isolation and signal transmission in harsh electrical environments. Power Supplies

: Acts as a feedback element in switched-mode power supplies (SMPS) to maintain isolation. Motor Drives a1458 optocoupler datasheet

: Provides isolation for power transistor gates (MOSFET/IGBT) to protect control circuitry from high-voltage spikes. Computing & Data

: Replaces pulse transformers and slow phototransistor isolators in TTL/CMOS logic interfaces. For full engineering details, you can download the HCPL-1458 Datasheet Broadcom product page Do not confuse this with the

, which is a dual operational amplifier (op-amp) and entirely different in function. STMicroelectronics schematic example of how to connect the A1458 to a microcontroller like an HCPL-A1458 | In Stock | Utsource

The component often referred to as the in the context of optocouplers is the , a high-speed, hermetically sealed device manufactured by (formerly Avago/Agilent). Key Technical Specifications

The HCPL-1458 is designed for high-performance signal isolation in demanding environments.

Optimized for high-speed operations with a propagation delay of approximately 35 ns at 10 kHz Voltage Range: Operates with a wide cap V sub cap C cap C end-sub 3.0V to 5.5V

, making it compatible with both low-voltage and standard digital systems. Isolation:

Features an integrated insulating layer to provide robust electrical isolation between input and output. Output Type: Typically features an open collector output

that is TTL compatible, allowing it to interface directly with microcontrollers and digital logic. Common packages include

, often hermetically sealed for high-reliability applications. Typical Applications

This optocoupler is frequently used to bridge sections of a system that operate at different voltage levels or to protect sensitive components from noise. Gate Drivers: Often used to drive power transistors like IGBTs and Power MOSFETs Microcontroller Interfacing:

Isolating low-voltage MCUs from high-voltage power stages to prevent damage from spikes. Industrial Systems:

Motor drive inverters, renewable energy systems (solar/wind inverters), and factory automation. Digital Isolation: Why would you choose the A1458 for your next project

Ground isolation for high-speed logic families like TTL, CMOS, and LSTTL. Potential Confusions Single Channel, High Speed Optocouplers Technical Data

The HCPL-A1458 (or A1458) optocoupler is a specialized high-speed optical isolation device engineered to provide robust galvanic isolation between low-voltage control signals and high-voltage power stages. It features an integrated driver designed to safely interface with power transistors such as IGBTs and power MOSFETs in demanding electrical environments.

A structured overview of the device's technical specifications and applications is detailed below. 💡 High-Level Device Summary

The HCPL-A1458 stands out as an active isolation component, which distinguishes it from typical signal-transfer isolators (like the common PC817). Instead of simply transferring a digital state or analog level, this optocoupler utilizes a specialized logic or gate-drive output stage to ensure clean, high-speed switching of power devices. This mitigates the classic performance bottleneck where low-gain phototransistors degrade switching speed. 📋 Technical Specifications Outline

While exact parameters vary between specific production runs and packaging formats (such as the SOP-8 hermetic package), standard values outlined in the A1458 datasheets represent the following operating characteristics: Typical Value / Spec Context & Importance Supply Voltage ( VCCcap V sub cap C cap C end-sub ) Broad logic compatibility, safe for battery power. Propagation Delay High-speed response, preserving duty cycle control. Output Type Open Collector / Gate Driver Capable of sinking/sourcing current for power switches. Packaging Hermetically Sealed SOP-8 Extreme durability against environmental pollutants. Isolation Barrier Standard High-Voltage Protects microcontrollers from high power spikes.

Note: For the exact maximum current ratings and isolated withstand voltages (frequently ranging between

peak on similar parts), reference the official semiconductor foundry specifications to ensure safety compliance. ⚙️ Core Operational Principles

Optical Transmission Barrier: Digital logic transitions power an internal infrared LED. This emitted light crosses a physically isolated air gap or glass barrier inside the chip, completely preventing raw current from crossing between the input and output networks.

High-Speed Detection: Traditional optocouplers suffer from high base-collector capacitance in their phototransistors, slowing down switching. Devices like the HCPL-A1458 bypass this by utilizing a separate photodiode detector paired with integrated amplification, boosting speed up to 100 times.

Power Stage Actuation: The output delivers the hard logic drive required to charge and discharge the high-capacitance gates of high-power IGBTs and MOSFETs, translating logic commands directly into raw electrical control. 🌐 Typical Application Environments

The primary objective of implementing this component is safety and clean signal communication in high-noise, high-energy operations. It is widely applied in: Help me understanding how optocoupler works - #21 by westfw

(often listed as HCPL-A1458 ) is a high-speed, single-channel optocoupler designed for robust signal isolation in demanding industrial and power applications. Manufactured by brands like Avago (Broadcom)

, it is frequently used to bridge low-voltage control signals and high-voltage power stages, such as driving IGBTs or Power MOSFETs in motor control systems. Ovaga Technologies Key Specifications According to technical data from , the primary electrical characteristics include: : Supports high-speed communication up to Isolation Voltage : High safety rating of (standard) to (enhanced). Supply Voltage ( cap V sub cap C cap C end-sub : Wide operating range of 3.0 V to 5.5 V , making it compatible with both 3.3V and 5V logic. Propagation Delay : Highly responsive with typical delays around 35 ns to 45 ns Common Mode Transient Immunity (CMR) : Exceptional noise rejection, typically 15,000 V/µs 50,000 V/µs renewable energy systems (solar/wind inverters)

, ensuring signal integrity in electrically noisy environments. Output Type Open Collector , allowing for flexible logic level shifting. Core Features & Design Hermetic Sealing

: 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

—which reduces the drive power needed from the control circuit. TTL Compatibility

: The output is fully compatible with standard TTL and CMOS logic gates. Applications

Commonly integrated into high-reliability systems including: Inverter Circuits : Solar and wind turbine inverters. Motor Drives

: Controlling speed and torque in AC motors while protecting the controller. Switching Power Supplies : Serving as a feedback element to maintain isolation. Data Communication

: Isolated line receivers and high-speed logic ground isolation. Equivalent & Substitute Parts If the A1458 is unavailable,

and other distributors suggest the following substitutes based on similar performance profiles:

ONSEMI, DC Input Logic Gate Output Optocoupler, Surface Mount, 8-Pin Dip (5 Ct), 6N137SM A widely available high-speed single-channel optocoupler.

Broadcom HCPL-4503-300E Optocoupler, Transistor, 3.75Kv, Smdip-8 | Transistor Output Optocouplers Offers high common-mode rejection ( VISHAY DC Input Transistor Output Optocoupler

Very high-speed with a TTL compatible open-collector output.

ONSEMI, DC Input Logic Gate Output Optocoupler, Through Hole, 8-Pin Dip (5 Ct), FOD260L Optimized for high data rate systems. or a specific circuit schematic for integrating this into a motor driver project? HCPL-1458 AVAGO/AGILENT Optocoupler / Led / Infrared

The HCPL-1458 from AVAGO/AGILENT manufacturer is a IC Chips with Hermetically Sealed, Low IF, Wide VCC, High Gain Optocouplers. Veswin Electronics HCPL-1458 | Original stock,Price - Ovaga Technologies

You need to turn on a 24V relay using a 3.3V ESP32 or 5V Arduino. Direct connection is impossible. You use the A1458: