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STR3A251D - Integrated AC/DC Converter IC

The STR3A251D from Sanken Electric is a high-performance 37W flyback AC/DC converter IC designed for isolated power supply applications. Featuring a 650V breakdown voltage and integrated switching elements, this converter delivers reliable power conversion with comprehensive protection features including over-current, over-voltage, over-temperature, and over-load safeguards.

Ideal for industrial, consumer electronics, and power supply designs requiring robust performance across extended temperature ranges (-40°C to 125°C). The 67kHz switching frequency and soft-start control ensure efficient, stable operation with minimal EMI.

Key Features

  • 37W output power with flyback topology
  • 650V breakdown voltage for high-voltage applications
  • Integrated internal switches for simplified design
  • Wide supply voltage range: 8.5V to 32V
  • 67kHz switching frequency with 75% duty cycle
  • Comprehensive fault protection (current limiting, OVP, OTP, OCP)
  • Soft-start control for reduced inrush current
  • Extended operating temperature: -40°C to 125°C
  • Through-hole 8-DIP package for easy assembly
  • RoHS compliant

Applications

  • Offline AC/DC power supplies
  • Industrial control systems
  • Consumer electronics power adapters
  • Auxiliary power modules
  • Isolated DC/DC converters

Documentation: Full datasheet and reference designs available for design-in support.

Compliance: RoHS compliant for environmental safety and regulatory requirements.

Product attributes Property Value
Manufacturer Sanken Electric USA Inc.
Product Series STR3A200
Packaging Tube |
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 650V
Topology Flyback
Voltage - Start Up 47 V
Voltage - Supply (Vcc/Vdd) 8.5V ~ 32V
Duty Cycle 75%
Frequency - Switching 67kHz
Power (Watts) 37 W
Fault Protection Current Limiting, Over Load, Over Temperature, Over Voltage
Control Features Soft Start
Operating Temperature -40°C ~ 125°C (TA)
Grade -
Qualification -
Mounting Type Through Hole
Package / Case 8-DIP (0.300", 7.62mm)
Supplier Device Package 8-DIP
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY