AO3423 ASFA ASTA P-Channel MOSFET for Whatsminer CB2 V8 Control Board
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AO3423 ASFA / ASTA P-Channel Enhancement Mode MOSFET | Trench Technology for Whatsminer CB2 V8 Control Board Repair
The AO3423 (silk markings ASFA / ASTA) is a P-channel enhancement mode MOSFET used on the Whatsminer CB2_V8 control board. Built with advanced trench technology for low RDS(on), low gate charge, and compatibility with low-voltage gate drive down to 2.5V VGS. Drop-in replacement when the original fails — common usage on the control board is for load-switching and PWM applications.
Headline specs: -20V VDS, -2A continuous ID at 25°C, 92mΩ max RDS(on) at 2A / 10V, 1.4V Vgs(th) max, 6.6nC gate charge at 4.5V. Operating temperature -55°C to +150°C junction. The low gate-drive voltage requirement makes it well-suited to direct microcontroller pin drive on the Whatsminer control board.
When to Replace the AO3423
- Load-switch dead on CB2_V8 board — gated rail not coming up despite control signal present.
- Drain-to-source short measured on the suspect device — dead-short failure mode.
- Excessive heat on the MOSFET under normal load — degraded RDS(on), thermal stress accelerating.
- Visible damage on the SOT-23 package — burnt, cracked, or discoloured after a fault event.
AO3423 Specifications
| Feature | Specification |
|---|---|
| Part Number | AO3423 (silk ASFA / ASTA) |
| FET Type | P-Channel Enhancement Mode |
| Technology | MOSFET (Metal Oxide) trench |
| Drain to Source Voltage (VDSS) | 20V |
| Continuous Drain (ID) @ 25°C | 2A (Ta) |
| Drive Voltage Range | 2.5V to 10V |
| RDS(on) Max | 92mΩ @ 2A, 10V |
| Vgs(th) Max | 1.4V @ 250µA |
| Gate Charge (Qg) Max | 6.6nC @ 4.5V |
| Vgs Max | ±12V |
| Input Capacitance (Ciss) Max | 620pF @ 10V |
| Power Dissipation Max | 1.4W (Ta) |
| Operating Temperature | -55°C to +150°C (TJ) |
| Compatible Control Board | Whatsminer CB2_V8 |
FAQ — AO3423 P-Channel MOSFET
Q: How do I identify the AO3423 on the board?
A: Silk markings "ASFA" or "ASTA" on the SOT-23 package — that's the abbreviated marking convention for AO3423. Different production batches may use either marking.
Q: P-channel vs N-channel substitution — does it matter?
A: Yes — completely different polarity. AO3423 is P-channel; substituting an N-channel device of the same VDS would short the gate circuit and likely destroy the surrounding driver. Always match channel type exactly.
Q: Rework profile?
A: SOT-23 small package — hot air at 320°C with flux paste, short dwell. Preheat the board to 100°C first to reduce thermal shock on adjacent passives.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities on AO3423 stock for CB2_V8 repair benches.
Related products
- Whatsminer CB2 V8 H3 Control Board (M20 / M21)
- Allwinner H3 CPU (Whatsminer CB2_V8 Control Board)
- H6 CV200-OS CPU (Whatsminer CB4 V10)
- Whatsminer CB4 V10 Control Board (M20-M32)
Whatsminer CB2_V8 control board repair benches stocking AO3423 in tape-and-reel volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
Buying in bulk for a mining farm or repair shop?
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