The A1458 offers significant isolation, typically holding up to
For standard optocouplers like the A1458, the CTR can range anywhere from depending on the specific bin/grade.
Today, we are taking a deep dive into the datasheet of a specific workhorse in the industry: the . While often overshadowed by its famous cousin, the PC817, the A1458 holds its own as a reliable component for signal transmission and isolation.
What (3.3V, 5V) are you driving the input with? a1458 optocoupler datasheet
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
Rated at 5300 Vrms, protecting sensitive control logic from high-voltage spikes. Power Consumption: Low current draw, with ICCcap I sub cap C cap C end-sub maximum around 1.2 mA. Common Mode Rejection (CMR): Very high immunity to noise ( >50is greater than 50 🛠️ Typical Pin Configuration
If you are designing a circuit or replacing a component: The A1458 offers significant isolation, typically holding up
: 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
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 | Symbol | Min | Max | Unit | |----------------------------|--------|------|-------|-------| | Forward current (LED) | IF | - | 50 | mA | | Reverse voltage (LED) | VR | - | 6 | V | | Collector-emitter voltage | VCEO | - | 80 | V | | Emitter-collector voltage | VECO | - | 7 | V | | Collector current | IC | - | 50 | mA | | Total power dissipation | Ptot | - | 150 | mW | | Isolation voltage (1 min) | VISO | - | 5000 | Vrms | | Operating temperature | Topr | -55 | +110 | °C | | Storage temperature | Tstg | -55 | +125 | °C | What (3
Internally, the A1458 consists of:
Protecting sensitive microcontrollers from high-voltage transients in industrial control systems .
Safely connecting a 3.3V/5V MCU to high-voltage industrial equipment.
These are the "do not exceed" limits. Exceeding these will result in a fried component (and potentially a fried circuit).
Understanding the A1458 Optocoupler: A Comprehensive Datasheet and Application Guide