| Equivalent | BLT81-SMD | |
| Type | Transistor Silicon NPN | |
| Case | SOT223 | |
| Manufacturer | NXP Semiconductors | |
| Polarity | NPN | |
| Maximum Collector Power Dissipation (Pc) | 2 W | |
| Maximum Collector-Base Voltage |Vcb| | 20 V | |
| Maximum Collector-Emitter Voltage |Vce| | 9.5 V | |
| Maximum Emitter-Base Voltage |Veb| | 2.5 V | |
| Maximum Collector Current |Ic max| | 0.5 A | |
| Max. Operating Junction Temperature (Tj) | 175 °C | |
| Collector Capacitance (Cc) | 2.7 pF | |
| Forward Current Transfer Ratio (hFE), MIN | 25 | |
| SKU | 85472 | |