| Equivalent | 2SD78 | |
| Type | Transistor Silicon NPN | |
| Case | TO39 | |
| Manufacturer | NEC | |
| Vbr CBO | 100 | |
| Vbr CEO | 80 | |
| Max. PD (W) | 15 | |
| Max. hFE | 160 | |
| Min hFE | 40 | |
| Ic Max. (A) | 2.0 | |
| @Ic (test) (A) | 500m | |
| Icbo Max. @Vcb Max. (A) | 1.0u | |
| Polarity | NPN | |
| R(sat) (Û) | 600m | |
| Derate Above 25°C | 100m | |
| Oper. Temp (°C) Max. | 175 | |
| @VCE (V) | 2.0 | |
| Pinout Equivalence Number | 3-12 | |
| Surface Mounted Yes/No | NO | |
| Maximum Collector Power Dissipation (Pc) | 1 W | |
| Maximum Collector-Base Voltage |Vcb| | 100 V | |
| Maximum Collector-Emitter Voltage |Vce| | 60 V | |
| Maximum Emitter-Base Voltage |Veb| | 12 V | |
| Maximum Collector Current |Ic max| | 2 A | |
| Max. Operating Junction Temperature (Tj) | 175 °C | |
| Forward Current Transfer Ratio (hFE), MIN | 40 | |
| SKU | 556403 | |