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| Part Number | 2N4391 | 2N4391UB | 2N4391UB/TR | 2N4391UBC/TR | 2N4391UBC |
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Series | - | - | - | * | - |
| Package/Case | - | - | - | - | 3-SMD, No Lead |
| Packaging | Bulk | Bulk | Tape & Reel (TR) | Tape & Reel (TR) | Bulk |
| Product Status | Active | Active | Active | Active | Active |
| FET Type | N-Channel | - | - | - | N-Channel |
| Voltage - Breakdown (V(BR)GSS) | 40 V | - | - | - | - |
| Drain to Source Voltage (Vdss) | - | - | - | - | - |
| Current - Drain (Idss) @ Vds (Vgs=0) | 50 mA @ 20 V | - | - | - | - |
| Current Drain (Id) - Max | - | - | - | - | - |
| Voltage - Cutoff (VGS off) @ Id | 4 V @ 1 nA | - | - | - | - |
| Input Capacitance (Ciss) (Max) @ Vds | 14pF @ 20V | - | - | - | - |
| Resistance - RDS(On) | 30 Ohms | - | - | - | - |
| Power - Max | 1.8 W | - | - | - | - |
| Operating Temperature | -55°C ~ 125°C (TJ) | - | - | - | - |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
| Mounting Type | Through Hole | - | - | - | Surface Mount |
| Supplier Device Package | TO-18 | - | - | - | UBC |
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