OSG65R069HS 700V 159A MOSFET for ASIC Miner Power Supply Unit

OSG65R069HS 700V / 159A MOSFET | High-Voltage Power Transistor Replacement for ASIC Miner Power Supply Unit Repair

The OSG65R069HS is a 700V / 159A N-channel MOSFET built around the charge-balancing super-junction architecture — used in the primary switching stage of ASIC miner power supplies. Direct drop-in replacement when an original device fails: restores stable power delivery and clears the dead-PSU / overcurrent-trip symptoms that come from a degraded high-voltage primary switch. Designed to withstand powerful avalanche events, which is what kills ordinary MOSFETs in mining PSU primary-side service.

The charge-balancing method delivers low on-resistance (Rds(on)) and low gate charge (Qg) together — historically a trade-off, super-junction breaks it. Result: minimal conduction losses at sustained high current, fast switching with low switching losses, and peak switching performance across the broad operating envelope mining PSUs see. Suitable for high-power-density applications including computer batteries, LED lighting, telecom power, server power, EV chargers, and solar / UPS systems beyond crypto mining.

When to Replace the OSG65R069HS

• PSU primary stage dead — high-voltage MOSFET failed short or open, no switching action on the primary side.
• Overcurrent trip on PSU startup — short across drain-source pulling the primary controller into protection.
• Excessive heating at the MOSFET location — degraded Rds(on), conduction loss rising above safe envelope.
• Visible burn or thermal damage on the package — direct replacement, swap any paralleled MOSFETs on the same leg.
• Preventive PSU refurbishment — replace primary-stage MOSFETs alongside electrolytics during a complete rebuild.

OSG65R069HS MOSFET Specifications

FAQ — OSG65R069HS MOSFET

Q: Why does charge-balancing super-junction matter for mining PSU duty?
A: Traditional MOSFETs trade off between Rds(on) (conduction loss) and Qg (switching loss) — lower one, the other rises. Charge-balancing super-junction breaks the trade-off, delivering both low Rds(on) and low Qg. Result: the part stays efficient both at static load (low conduction loss) and at high switching frequency (low switching loss) — exactly the duty profile of an ASIC PSU primary stage.

Q: How do I diagnose a failed OSG65R069HS in-circuit?
A: Diode-test drain-source with the gate grounded — a healthy N-channel reads infinite drain-source resistance. Short across drain-source confirms a dead part. Visual inspection catches the obvious burn cases. Note: the part operates at 400V+ in the primary stage — discharge bulk capacitors before probing.

Q: Should I replace all paralleled MOSFETs on the affected leg?
A: For best long-term reliability replace all paralleled MOSFETs on the affected leg — the surviving parts have absorbed thermal stress from the failure event and have shortened service life.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Tube and tray quantities are stocked.

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Repair shops stocking OSG65R069HS MOSFETs by the tray? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.