STR-W6251D, STR-W6252D, STR-W6253D, STR-W6253MD: PWM Off-line Switching Regulators

These parts are in production but have been determined to be not for new design. This classification indicates that sale of this device is currently restricted to existing customer applications. These devices should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.

The STR-W6200D series are current-mode PWM ICs that incorporate controller chips. These devices are manufactured using a proprietary high-voltage BCD process, and avalancheguaranteed MOSFETs. These elements allow power supply systems designs that are highly reliable and simple, with fewer peripheral components. These ICs also provide Auto-Burst mode operation, which lowers input power requirements at light loads, and improves efficiency over the entire load range and universal-input range.


Part Number fosc VDSS rDS(on) VIN POUT
kHz V Ω   W
STR-W6251D 67 650 3.95 Wide 30
230 VAC 45
STR-W6252D 2.8 Wide 40
230 VAC 60
STR-W6253D 1.9 Wide 60
230 VAC 90
STR-W6253MD 50 1.9 Wide 55
230 VAC 80
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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Overcurrent protection (OCP) with ac input voltage compensation function; no additional peripheral circuits required—minimizes dependency of OCP on ac input
  • Overload protection (OLP) with integrated timer reduces power stress (temperature rise) at overload condition, requires no peripheral components
  • Avalanche-guaranteed MOSFET improves device capability of withstanding excess surge voltage, providing a simple surge absorber circuit without breakdown voltage derating
  • Start-up circuit eliminates the need for a start-up resistor, and helps to reduce input power consumption
  • Bias Assist function improves start-up performance by selfbiasing the VCC pin, and allows a use of a small value VCC capacitor, resulting in improved response to overvoltage conditions
  • Very low current consumption in nonoperating (UVLO) state: ICC(off) = 5 µA (typical) at VCC = 13.8 V
  • Slope compensation circuit stabilizes operation, preventing interference from subharmonics
  • Leading Edge Blanking
  • Various protections:
    • Overcurrent Protection (OCP), pulse-by-pulse sensing
    • Overload Protection (OLP), auto restart after certain duration
    • External Latch Protection (ELP), latched
    • Overvoltage Protection (OVP), latched
    • Thermal Shut Down (TSD), latched
  • Externally-activated shut down protection (ELP) for emergency system shut down
  • Auto-Burst Standby function (pin < 0.1 W at zero output load condition)
  • TO-220 full-molded package with 6 pins

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Product Image Functional Block Diagram Package

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
STR-W6251D 6-lead TO-220 -20°C to 115°C Yes View Data Not for new design Contact your
local sales rep
Check Stock
STR-W6252D 6-lead TO-220 -20°C to 115°C Yes View Data Not for new design Contact your
local sales rep
Check Stock
STR-W6253D 6-lead TO-220 -20°C to 115°C Yes View Data Not for new design Contact your
local sales rep
Check Stock

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