I have writing notes on my journey to learning to repair laptop motherboards. I have a damaged dell inspiron laptop and wrote about it in my note starting point to repair my Laptop. In the second note, Dell Inspiron Power Supply Revisted For Repair, I had carefully looked up the initial power supply line schematic which is on page 38. In that note I have listed all the components MOSFETs, capacitors, resistors used on that schematic.
Now I was wondering if I could simulate this power circuit diagram in proteus software which I am acquainted to. I could not find the FDV301N MOSFET in proteus library and so I searched for altenative to this FDV301N MOSFET. And below is the note.
The FDV301N-NL-GP is a small-signal N-channel MOSFET used in low-power switching and logic-level control applications. It is ideal for compact designs like laptops, due to its:
🔧 Key Specs of FDV301N:
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Type: N-channel MOSFET
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V<sub>DS</sub> max: 25 V
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I<sub>D</sub> max: ~220 mA
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R<sub>DS(on)</sub>: ~1.6 Ω @ V<sub>GS</sub> = 2.5 V
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Gate threshold: ~0.8–1.3 V (logic-level)
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Package: SOT-23
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Use: Load switching, logic interfacing, signal routing
🔁 Suitable Alternatives:
| Part Number | V<sub>DS</sub> | I<sub>D</sub> | R<sub>DS(on)</sub> | Notes |
|---|---|---|---|---|
| BS170 | 60 V | 500 mA | 1.2–5 Ω | Through-hole, higher voltage |
| 2N7002 | 60 V | 115 mA | ~2.5 Ω | Very common logic-level MOSFET |
| IRLML6344 | 30 V | 3.7 A | 0.045 Ω | Strong drive, better for higher loads |
| BSS138 | 50 V | 200 mA | ~3–5 Ω | Widely used SOT-23 logic-level MOSFET |
| PMV16XN | 30 V | 4.2 A | 0.055 Ω | Very low R<sub>DS(on)</sub>, suitable for higher switching |
| Si2302DS | 20 V | 2.8 A | 0.085 Ω | Popular, low R<sub>DS(on)</sub>, logic-level |
So I need a 220mA, 25V MOSFET. I searched in the proteus library for BS170 which I found and will be using alternative MOSFET for my laptop power supply simulation work. The BS170 is a through hole MOSFET but I don't have problem with that because I am just doing simulation.
Thats all.
