ZTL431BFTA Shunt Voltage Reference IC Adjustable 2.5V 100 mA SOT-23-3
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ZTL431BFTA Shunt Voltage Reference IC | Adjustable 2.5V-20V / 100mA Reference for Whatsminer PSU and Control Board Feedback Loop Repair
The ZTL431BFTA is a shunt-based adjustable voltage reference IC used on Whatsminer power supply feedback loops and control board regulation circuits. Provides the stable voltage reference that the PSU's primary controller compares its output against — when this part degrades or fails, the PSU output drifts, oscillates, or refuses to start because the regulation loop loses its anchor. Drop-in replacement restores feedback-loop stability and brings the PSU back to spec.
Adjustable output range from 2.5V to 20V with a 100mA cathode current capability, in compact SOT-23-3 surface-mount package. The shunt architecture (compatible with the TL431-family pin layout) makes it a drop-in for the original part on most Whatsminer PSU boards. Temperature stability and low reference drift are the key parameters for PSU regulation — degraded references cause slow output drift that's hard to diagnose without a scope.
When to Replace the ZTL431BFTA
- PSU output voltage drifts over time — feedback reference degraded, regulation loop slowly losing accuracy.
- PSU output oscillates under load — reference noise rising, regulation loop unstable.
- PSU refuses to start with no obvious cause — reference dead, controller can't establish the regulated output.
- Visible burn or damage on the SOT-23-3 package — direct replacement.
- Preventive PSU refurbishment — replace alongside electrolytics during a complete rebuild on used Whatsminer PSU units.
ZTL431BFTA Shunt Voltage Reference Specifications
| Parameter | Specification |
|---|---|
| Part Number | ZTL431BFTA |
| Function | Adjustable shunt voltage reference |
| Output Voltage Range | 2.5V to 20V (adjustable) |
| Cathode Current | Up to 100mA |
| Architecture | Shunt reference (TL431-family pin layout) |
| Package | SOT-23-3 (SMD) |
| Mounting | Surface mount reflow |
| Category | Integrated Circuits (ICs) → Power Management (PMIC) → Voltage Reference |
| Typical Use | Whatsminer PSU feedback loop, control board regulation circuit |
| Condition | Brand New |
FAQ — ZTL431BFTA Voltage Reference
Q: Is the ZTL431BFTA interchangeable with the TL431?
A: Same shunt-reference architecture and pin layout — they're functionally interchangeable for most applications. The ZTL431B variant offers tighter initial accuracy and lower drift, useful for sensitive PSU feedback loops. For drop-in replacement on a Whatsminer board that specifies the ZTL431B, use the matching part.
Q: How do I set the output voltage?
A: Standard TL431-family topology — a resistor divider between the cathode and anode sets the regulated output. Vout = 2.5V × (1 + R1/R2). The 2.5V internal reference is the typical value; verify against your specific board's existing divider before substituting.
Q: How do I diagnose a degraded reference in-circuit?
A: Probe the reference output with a multimeter against ground — should read the expected setpoint within ±1%. Significant drift or noise indicates degradation. Replace the part and verify the PSU output returns to spec.
Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Reel and tape quantities are stocked.
Related products
Repair shops stocking ZTL431BFTA references by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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