If you are trying to for a repair, I can help you: Find suppliers and check stock
: The PC817 is a very common, low-speed optocoupler. If you are designing for high-speed applications like digital audio or fast switching power supplies, the A1458 series is the superior choice. For simple on/off control (e.g., turning a light on/off), the PC817 is often sufficient and less expensive.
The result: a compact, inexpensive driver that met safety and performance goals — all because Mara treated the A1458 datasheet as more than a sheet of numbers. It became a design checklist: electrical limits, timing, thermal behavior, and safety constraints — the practical guidance that turned a part’s specifications into a working, dependable product. a1458 optocoupler datasheet
When purchasing, look for the specific ordering code (e.g., HCPL-1458-000E) to confirm package style and RoHS compliance. Key procurement details include:
To safely use the A1458, you must correctly calculate the input current-limiting resistor ( Rincap R sub i n end-sub ) and the output pull-up resistor ( Rpullcap R sub p u l l end-sub Step 1: Calculate the Input Resistor ( Rincap R sub i n end-sub If you are trying to for a repair,
: Reliable feedback path isolation in switch-mode power supplies (SMPS). Data Communication
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The (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
In long-distance data communication lines, ground potential differences between nodes can create massive ground loop currents. The result: a compact, inexpensive driver that met
In a standard 8-pin DIP or SOIC-8 package, the A1458 optocoupler typically follows this pin configuration: