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Rectangular silver AT power supply unit with cooling fan visible on one side

myVolts

myVolts 420W AT Power Supply for Liteon PS-5251-08

SKU CH-BYJP-ZZH9E

Replaces legacy Liteon PS-5251-08 units with a 420 W AT supply featuring 115/230 V input, reduced depth and full protection circuits

  • TypeAT
  • 420 W output powers demanding legacy builds
  • 115 V or 230 V input works worldwide
  • 9 inch depth fits tight vintage cases
  • 17 ms hold-up time rides out brownouts
  • Over-voltage and short-circuit protection guards components

Compatibility and Form Factor

This 420W AT power supply replaces the Liteon PS-5251-08 and part numbers 441390-001 and 440569-001. The reduced depth design measures 5.9 inches in height and 3.4 inches in width for increased compatibility. It is built for users restoring older legacy systems that require an AT type unit. Buyers needing ATX standard connectors or higher wattage for modern builds should look elsewhere.

Main Connector and Rail Layout

The unit provides a 20+4 pin main connector and operates on a single +12V rail rated at 16A. Combined +3.3V and +5V rails deliver 13A each, with auxiliary outputs at 1A, 2A and 8A respectively. This specific pin-out and rail distribution decides whether the PSU matches the original Dell Liteon wiring. Systems requiring multiple +12V rails or a pure 20-pin connector will not be compatible.

Protections, Efficiency and Acoustics

Over voltage, over current, over power and short circuit protection circuits guard connected components. The supplier highlights high efficiency with low noise and ripple from the cooling fan. Rise time is under 70ms and hold-up time reaches 17ms at nominal input voltage of 115 or 230V. The unit accepts 50/60Hz input frequency for worldwide mains compatibility.

Points forts

  • 420 W output powers demanding legacy builds
  • 115 V or 230 V input works worldwide
  • 9 inch depth fits tight vintage cases
  • 17 ms hold-up time rides out brownouts
  • Over-voltage and short-circuit protection guards components

Caractéristiques

TypeAT

Questions sur cet article

What does the 420 W rating mean once this PSU is installed?

The 420 W rating is the combined continuous power the unit can deliver across its +3.3 V, +5 V and +12 V rails.

What interface standard does the main connector follow, and what does it cap in practice?

The 20+4 Pin main connector follows the ATX specification, capping the motherboard power delivery to the limits of that 24-pin interface.

What physical clearance does the reduced-depth design need to fit or mount?

The unit measures 5.9 in height by 3.4 in width, so the case must provide at least that much clearance in the PSU bay.

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