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| Part Number | BF421-BP | BF421-AP |
| Manufacturer | Micro Commercial Co | Micro Commercial Co |
| Series | - | - |
| Package/Case | TO-226-3, TO-92-3 (TO-226AA) | TO-226-3, TO-92-3 (TO-226AA) Formed Leads |
| Packaging | Bulk | Tape & Box (TB) |
| Product Status | Obsolete | Obsolete |
| Transistor Type | PNP | PNP |
| Current - Collector (Ic) (Max) | 100 mA | 100 mA |
| Voltage - Collector Emitter Breakdown (Max) | 300 V | 300 V |
| Vce Saturation (Max) @ Ib, Ic | 600mV @ 5mA, 30mA | 600mV @ 5mA, 30mA |
| Current - Collector Cutoff (Max) | 10nA (ICBO) | 10nA (ICBO) |
| DC Current Gain (hFE) (Min) @ Ic, Vce | 50 @ 25mA, 20V | 50 @ 25mA, 20V |
| Power - Max | 830 mW | 830 mW |
| Frequency - Transition | 60MHz | 60MHz |
| Operating Temperature | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) |
| Grade | - | - |
| Qualification | - | - |
| Mounting Type | Through Hole | Through Hole |
| Supplier Device Package | TO-92 | TO-92 |
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