However, based on common optocoupler naming conventions and visual similarities, here are the three most likely components you might be looking for, along with a summary of their datasheets:
The A1458 is a single-channel, phototransistor output optocoupler. It consists of an infrared light-emitting diode (LED) on the input side, optically coupled to an NPN silicon phototransistor on the output side. The coupling is achieved via a transparent insulating layer, typically providing isolation up to 5,000V RMS.
| Dimension | Min (mm) | Max (mm) | |-----------|----------|----------| | Length | 4.50 | 4.70 | | Width | 6.30 | 6.50 | | Height | 3.40 | 3.60 | | Lead pitch| 2.54 (nominal) |
The A1458 optocoupler 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.
Whether you are building a smart home switch or a power supply, the A1458 is a reliable, cost-effective component to keep in your parts bin.
Disclaimer: This blog post is for educational purposes. Always consult the official manufacturer datasheet for the specific A1458 variant you are using, as specifications can vary between brands.
The (commonly referred to as the HCPL-1458) is a high-speed, logic-gate optocoupler designed for isolation in high-performance digital and power systems . It is primarily manufactured by brands such as Broadcom/Avago (formerly Agilent) . Key Technical Specifications a1458 optocoupler datasheet
The A1458 is characterized by its high common-mode rejection and speed, making it suitable for noisy industrial environments .
Speed & Data Rate: Typically supports data rates up to 10–15 MBd .
Propagation Delay: Approximately 35–45 ns (typical), with a maximum of 8 ns for some high-speed variants .
Isolation Voltage: Rated for 3750 Vrms to 5300 Vrms depending on the specific variant and package .
Common Mode Rejection (CMR): Minimum of 15,000 V/µs (often reaching 50 kV/μs in newer models like the HCPL-1458) . Supply Voltage ( VCCcap V sub cap C cap C end-sub
): Operates between 3.0 V and 5.5 V, making it compatible with both 3.3V and 5V logic . However, based on common optocoupler naming conventions and
Output Type: 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)
While exact pinouts can vary by package style (e.g., 16-pin DIP versions also exist), the standard 8-pin configuration typically follows :
Input Side: Pins for Anode and Cathode of the internal GaAsP LED. Output Side: Pins for VCCcap V sub cap C cap C end-sub , Output ( VOcap V sub cap O ), and Ground ( GNDcap G cap N cap D Common Applications
Motor Control: High-speed gate driving for IGBTs and Power MOSFETs in industrial inverters .
Digital Isolation: Ground loop elimination and signal isolation for TTL/CMOS high-speed logic .
Switching Power Supplies: Feedback isolation in SMPS and DC-DC converters . Disclaimer: This blog post is for educational purposes
Telecommunications: Used for high-speed digital interface isolation and line receivers . Substitute & Cross-Reference Parts
If the A1458 is unavailable, the following components are common functional alternatives: 6N137: A widely available 10MBd high-speed optocoupler .
HCPL-4506 / HCPL-0700: Often used as direct logic-output substitutes .
H11L1: A logic-gate optocoupler featuring a Schmitt trigger output for enhanced noise immunity .
For detailed performance curves and thermal derating, you can download the full technical data from Farnell or Alldatasheet . Single Channel, High Speed Optocouplers Technical Data
Power Transistor Isolation. Feedback Element in. Switched Mode Power. Supplies. Replaces Pulse Transformers. • Replaces Slow. HCPL-A1458 | In Stock | Utsource
H11L1 | Brief Description: Logic-gate optocoupler with Schmitt trigger output, ideal for interfacing with low logic circuits. HCPL-1458/ A1458 | In Stock - utsource