LM317MBSTT3G Positive Regulator for Antminer S21 T21 S19j Pro+
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LM317MBSTT3G 500mA Adjustable Positive Voltage Regulator | Antminer S21 / T21 / S19j Pro+ Repair
The LM317MBSTT3G is a 500mA adjustable positive voltage regulator with output voltage configurable anywhere from 1.2V to 37V via external feedback resistors. Used on Antminer S21, T21, and S19j Pro+ hashboards for auxiliary-rail generation — the position where 500mA capability and tight regulation matter for ASIC sub-rail bias.
Headline specs: output current exceeds 500mA, output voltage 1.2-37V, internal thermal overload protection, internal short-circuit current limiting, output transistor safe-area compensation, floating operation for high-voltage applications, lead-free package.
When to Replace the LM317MBSTT3G
- Auxiliary rail dead on S21 / T21 / S19j Pro+ hashboard.
- Output drooping under load — regulator can't sustain 500mA spec.
- Repeated thermal-shutdown trips — internal protection responding to chip degradation.
- Visible damage — burnt or cracked package.
LM317MBSTT3G Specifications
| Feature | Specification |
|---|---|
| Type | Adjustable Positive Linear Voltage Regulator |
| Output Current | Exceeds 500mA |
| Output Voltage Range | 1.2V to 37V |
| Thermal Protection | Internal thermal overload protection |
| Short-Circuit Protection | Internal current limiting |
| Safe Area Compensation | Output transistor SOA built-in |
| Operation Mode | Floating (high-voltage capable) |
| Compliance | Lead-free, RoHS |
| Application | Antminer S21 / T21 / S19j Pro+ hashboard auxiliary rail |
FAQ — LM317MBSTT3G Regulator
Q: How do I set the output voltage?
A: Standard LM317 feedback divider — VOUT = 1.25V × (1 + R2/R1). Match the original board's resistor values to recover the target rail voltage.
Q: 500mA vs 1.5A LM317 variants — substitution?
A: The LM317M family is 500mA. LM317T = 1.5A. Higher-current substitutes typically have different pinout and package — verify before swapping.
Q: Rework profile?
A: Most LM317MBSTT3G variants ship in SOT-223 SMD. Hot air at 320°C with flux paste; the exposed tab must reflow with the PCB thermal pad for proper heat dissipation.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.
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Antminer S21 / T21 / S19j Pro+ repair benches stocking LM317MBSTT3G regulators in volume? Email contact@lys-sz.com for tape-and-reel pricing. Worldwide shipping from our Shenzhen warehouse.
Buying in bulk for a mining farm or repair shop?
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