Transistor Equivalent Finder Tool

Q: What if the current rating (IC or Id) is higher?

That's perfectly fine. A higher current rating means the replacement can handle more load, which gives you a safety margin. Just ensure it's equal to or greater than your original part to avoid overheating.

Q: Does the physical package and pinout matter?

Yes, very much. The replacement must physically fit on your circuit board (e.g., TO-92 for through-hole, SOT-23 for surface-mount). You must also verify the pinout matches, or you'll need to modify your layout.

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Or search by specifications

FET / MOSFET

N-Channel / P-Channel MOSFETs

BJT Transistor

NPN / PNP bipolar junction transistors

Type

Package

Manufacturer

Min V_DS (V)

Min I_D (A)

Max R_DS(ON) (mΩ)

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When to Choose BJT vs FET

BJT (Bipolar Junction Transistor)

Best for audio amplification, radio circuits, Arduino projects, LED drivers, and low-frequency switching. Current-controlled with high gain.

FET / MOSFET

Best for high-speed switching, motor control, power supplies, DC-DC converters, and high-frequency circuits. Voltage-controlled with low gate power draw.

Frequently Asked Questions

1. Do I need to match polarity (NPN vs PNP, N-Channel vs P-Channel)?

Yes, absolutely. They control current in opposite ways and cannot be swapped. Always replace an NPN with an NPN, and an N-Channel with an N-Channel.

2. Can I use a transistor with a higher voltage rating (VCEO or Vds)?

Yes. This is the maximum voltage the transistor can handle when off. A higher rating is safe and often recommended - never use a lower rating, as it will cause breakdown.

3. What if the current rating (IC or Id) is higher?

That's perfectly fine. A higher current rating gives you a safety margin. Just ensure it's equal to or greater than your original part - never lower, as it risks overheating and failure.

4. Does the physical package and pinout matter?

Yes, very much. The replacement must physically fit your board (e.g., TO-92 for through-hole, SOT-23 for surface-mount). Verify the pinout (Gate/Drain/Source order) or you'll need to modify your layout.