BJT vs MOSFET - When to Use What
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Most comparisons miss the real point.
👉 It comes down to how you control current:
- BJT → Current-controlled
- MOSFET → Voltage-controlled
This difference defines everything.
⚡ Quick Selection Table
| Scenario | Use BJT | Use MOSFET |
|---|---|---|
| Analog (audio, amplification) | ✅ | ❌ |
| High-speed switching (PWM) | ❌ | ✅ |
| MCU control (3.3V/5V) | ⚠️ Needs base current | ✅ Easy |
| High current / power | ❌ Inefficient | ✅ Efficient |
| Simple low-cost circuits | ✅ | ⚠️ |
🔥 Fast Decision Rule
- Amplifier → BJT
- Switch (motor, LED, SMPS) → MOSFET
- MCU GPIO → MOSFET (logic-level)
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