DIO7910A08ST5 KAD3B 0.8V LDO for Antminer HS3 S19Kpro S19XP S21 T21 Hashboard
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DIO7910A08ST5 KAD3B 0.8V LDO – Hashboard Repair for Antminer S19XP, S21 & T21
The DIO7910A08ST5 (silk-screen marking KAD3B) is a high-precision 0.8V CMOS LDO regulator in a SOT23-5 package, used on the hashboards of the Antminer HS3, S19K Pro, S19XP, S21 and T21. It delivers up to 300mA with a dropout of just 170 mV and ±1 % output accuracy, providing the clean sub-1 V rail that the ASIC chips require for stable hashing. New original component.
Why This LDO Fails on Hashboards
Each LDO on the hashboard powers the core voltage rail for a group of ASIC chips. Sustained high current draw and elevated board temperatures gradually stress the device, and a transient overvoltage or short on the output can destroy it instantly. A failed LDO causes its chip group to lose the 0.8 V rail — those chips stop responding and the board reports reduced or zero hash rate. The 75 dB PSRR at 1 kHz ensures that power supply ripple does not propagate to the sensitive ASIC core voltage, which is why a generic regulator is not a suitable substitute.
Replacement Procedure
Remove the hashboard and locate the failed LDO near the affected chip group — the SOT23-5 package measures roughly 2.9 × 1.6 mm and is marked KAD3B. Verify failure by measuring the output pin: it should read 0.8 V under bias; an absent or out-of-range reading confirms the fault. Desolder with hot air at 300–330 °C, clean pads with flux and solder wick, place the new DIO7910A08ST5 with pin 1 aligned, and reflow. Confirm 0.8 V on the output, reinstall and verify full chip detection.
DIO7910A08ST5 LDO Specifications
| Parameter | Value |
|---|---|
| Part Number | DIO7910A08ST5 |
| Marking | KAD3B |
| Output Voltage | 0.8 V (±1 %) |
| Max Output Current | 300 mA |
| Input Voltage | 1.6 V – 5.5 V |
| Dropout Voltage | 170 mV @ 300 mA |
| PSRR | 75 dB @ 1 kHz |
| Quiescent Current | 25 µA typical |
| Package | SOT23-5 |
| Condition | New (original) |
Related Antminer Hashboard LDOs & Regulators
- DIO7910A12ST5 KAF 1.2V LDO – Antminer S19XP Hashboard
- LM317MDCYR Adjustable Regulator – Antminer S21 / T21
- 47µF 50V SMD Capacitor – Antminer S19 / S21 / T21 Hashboard
- Universal Hashboard Test Fixture – Antminer S19 / S21 / T21
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