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| Part Number | STD840DN40 |
| Datasheet | STD840DN40 datasheet |
| Description | TRANS 2NPN 400V 4A 8DIP |
| Manufacturer | STMicroelectronics |
| Series | - |
| Part Status | Obsolete |
| Transistor Type | 2 NPN (Dual) |
| Current - Collector (Ic) (Max) | 4A |
| Voltage - Collector Emitter Breakdown (Max) | 400V |
| Vce Saturation (Max) @ Ib, Ic | 1V @ 400mA, 2A |
| Current - Collector Cutoff (Max) | 250µA |
| DC Current Gain (hFE) (Min) @ Ic, Vce | 8 @ 2A, 5V |
| Power - Max | 3W |
| Frequency - Transition | - |
| Operating Temperature | 150°C (TJ) |
| Mounting Type | Through Hole |
| Package / Case | 8-DIP (0.300", 7.62mm) |
| Supplier Device Package | 8-DIP |