Diodes DPC851 Photocouplers Offer 350V Isolation for Appliances and Power Systems
Compact 350V photocouplers from Diodes offer 5kV isolation, multiple package types, and certified performance for HVAC, power, and motor control.
Each part contains an infrared LED and a phototransistor, providing 5,000Vrms of isolation between input and output. That barrier helps protect low-voltage logic from transients or ground shifts on the high side. The minimum current transfer ratio (CTR) is 50%, and performance stays consistent between –55°C and +110°C, which covers most appliance and embedded environments.
The series comes in four package types:
- DIP-4 (DPC851D)
- Miniature DIP-4 (DPC851W)
- SL-4 Surface Mount (DPC851S)
- SLM-4 Miniature Surface Mount (DPC851L)
All versions are MSL-1 moisture rated and come in either tube or reel packaging depending on the form factor. Several models are also certified to VDE EN IEC 60747-5-5, and these are marked with a “-V” suffix. The full range is compliant with UL1577 and CQC 4943.1-2022 standards.
For switching applications, the DPC851’s low coupling capacitance of 0.6pF at 1MHz helps keep signals clean. That makes it a good fit for fast control loops, LED drivers, and other circuits where timing matters.
Applications include:
- AC and BLDC motor drives
- Fridges, washing machines, and HVAC systems
- LED lighting systems
- EV charging modules
- Server power and telecom equipment
- Programmable logic controllers
Summary
The DPC851 series offers engineers a compact, certified solution for isolated signal paths where high voltage, heat, and reliability are all key considerations.
Read the original announcement here.
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