SBT20L100CT TO-220AB Low VF Schottky Diode 20A 100V for Bitmain APW12
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SBT20L100CT TO-220AB Super Barrier Rectifier | 20A / 100V Low-VF Schottky Diode Replacement for Bitmain APW12 Power Supply Repair
The SBT20L100CT is a Super Barrier Rectifier (SBR) in TO-220AB through-hole package — used in the secondary rectification stage of the Bitmain APW12 power supply. Drop-in replacement when the original Schottky rectifier fails: restores stable output and clears the dead-rail, output-ripple, or hard-fault PSU symptoms that come from a degraded secondary-side diode. SBR technology refines the conventional Schottky topology — lower forward voltage drop than legacy Schottkys, better high-temperature stability, and stronger surge handling.
Rated for 100V maximum recurrent peak reverse voltage (VRRM), 70V RMS, and 20A maximum average forward rectified current (10A per diode) in the dual-diode TO-220AB common-cathode package. 180A peak forward surge current (IFSM at 8.3ms single half-sine) survives the startup inrush and fault-recovery events that destroy lower-spec parts. 15°C/W typical thermal resistance (RθJC) with the -40°C to +150°C operating junction temperature range matches the thermal envelope of a heatsink-mounted APW12 rectifier.
When to Replace the SBT20L100CT
- APW12 dead output after a fault event — secondary rectifier failed short or open.
- Excessive ripple on the output rail — degraded rectifier letting AC ripple through.
- Visible burn or thermal damage on the diode package — direct replacement.
- Excessive heat on the rectifier heatsink at normal load — VF rising on a degrading part.
- Preventive PSU refurbishment — refresh the secondary rectifier alongside electrolytics during a complete APW12 rebuild.
SBT20L100CT Specifications
| Parameter | Specification |
|---|---|
| Part Number | SBT20L100CT |
| Type | Super Barrier Rectifier (SBR — refined Schottky) |
| Package | TO-220AB (through-hole, common-cathode dual) |
| Max Recurrent Peak Reverse Voltage (VRRM) | 100V |
| Max RMS Voltage (VRMS) | 70V |
| Max Average Forward Rectified Current (IF(AV)) | 20A per device (10A per diode) |
| Peak Forward Surge Current (IFSM) | 180A @ 8.3ms single half sine-wave |
| Typical Thermal Resistance (RθJC) | 15°C/W |
| Forward Voltage Drop (VF) | Ultra low (SBR architecture) |
| Operating Junction / Storage Temperature | -40°C to +150°C |
| Typical Use | Bitmain APW12 secondary rectification stage |
FAQ — SBT20L100CT Super Barrier Rectifier
Q: What's the difference between a Super Barrier Rectifier (SBR) and a standard Schottky?
A: SBR refines the conventional Schottky topology to deliver lower forward voltage drop (VF) at the same current rating, better high-temperature stability, and stronger surge survival. Net result for PSU rectification: less heat dissipated in the part, lower thermal stress on adjacent components, longer service life.
Q: How do I diagnose a failed SBT20L100CT in-circuit?
A: Diode-test the part with the PSU unplugged and bulk capacitors discharged — should read forward voltage on one direction, infinite reverse. Short on either direction = failed. Visual inspection catches the obvious burn cases. Note: the part operates at hundreds of volts in service — discharge bulk caps before probing.
Q: Can I substitute a higher-current Schottky if this part is out of stock?
A: Any TO-220AB Schottky or SBR with 20A+ rating and 100V+ VRRM can substitute mechanically. Verify forward voltage drop is similar — much higher VF means more heat and potential premature failure.
Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Tube quantities are stocked.
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Repair shops stocking SBT20L100CT rectifiers by the tube? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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