SI4835DY P-Channel MOSFET 30 V 8.8A 1W Surface Mount 8-SOIC
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SI4835DY P-Channel MOSFET | 30V / 8.8A Replacement Transistor in 8-SOIC for ASIC Cryptominer PSU and Load-Switch Repair
The SI4835DY is a P-Channel MOSFET in 8-SOIC surface-mount package built around PowerTrench technology — designed for power-sourcing and high-side switching positions on ASIC cryptominer power supplies and control boards. Drop-in replacement when the original device fails: restores stable power delivery and clears the symptoms (dead rail, undervoltage faults, controller can't drive the high side) that come with a degraded P-channel switch.
Rated for 30V max drain-source voltage (Vds) and 8.8A continuous drain current (Id at 25°C). The 20mΩ maximum on-resistance at 8.8A / 10V Vgs minimises conduction loss; the 27nC gate charge at 10V gives fast switching with low gate-drive losses. ±25V gate-source voltage provides flexibility for high-side drive without external clamps. Standard 8-SOIC footprint matches the OEM pad layout on most modern miner PCBs.
When to Replace the SI4835DY
- Dead high-side rail on a control board or PSU — P-channel MOSFET failed open, downstream load gets no power.
- Excessive heating at the SI4835DY location — degraded Rds(on), conduction loss has risen above safe envelope.
- Visible burn or thermal damage on the 8-SOIC package — direct replacement, swap parallel parts on the same leg if any.
- Overcurrent trip on startup — short across drain-source pulling the upstream rail into protection.
- Preventive board refurbishment — refresh power-stage MOSFETs alongside electrolytics during a complete rebuild.
SI4835DY P-Channel MOSFET Specifications
| Parameter | Specification |
|---|---|
| Part Number | SI4835DY |
| Type | P-Channel MOSFET (PowerTrench) |
| Drain-Source Voltage (Vds) | 30V |
| Continuous Drain Current (Id @ 25°C) | 8.8A |
| On-Resistance (Rds(on) max) | 20mΩ @ 8.8A / Vgs=10V |
| Gate Charge (Qg) | 27nC @ 10V |
| Gate-Source Voltage (Vgs max) | ±25V |
| Package | 8-SOIC (SMD) |
| Power Dissipation (Pd) | 1W |
| Mounting | Surface mount reflow |
| Typical Use | ASIC cryptominer PSU, high-side load switch, power management |
FAQ — SI4835DY MOSFET
Q: Can I substitute an N-channel MOSFET for a P-channel?
A: No — P-channel and N-channel devices switch with opposite gate polarity. Substituting the wrong type either won't work or destroys the part on power-up. Match P-channel for P-channel positions.
Q: How do I diagnose a failed SI4835DY in-circuit?
A: Diode-test drain-source with the gate grounded — a healthy P-channel reads infinite. Short = failed. Visual inspection catches burn cases. For deeper analysis, lift one pin and measure threshold voltage and Rds(on) on a bench supply.
Q: Is there a higher-current substitute in the same footprint?
A: Several 8-SOIC P-channel MOSFETs offer higher current envelopes — verify the substitute matches gate threshold, Rds(on) target, and Vds rating before swapping at volume.
Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Reel and tube quantities are stocked.
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Repair shops stocking SI4835DY MOSFETs by the reel? 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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