| PartNumber | BUT12TU | BUT12ATU | BUT12A |
| Description | Bipolar Transistors - BJT NPN Si Transistor | Bipolar Transistors - BJT NPN Si Transistor | TRANS NPN 450V 8A TO-220 |
| Manufacturer | ON Semiconductor | ON Semiconductor | - |
| Product Category | Bipolar Transistors - BJT | Bipolar Transistors - BJT | - |
| RoHS | Y | Y | - |
| Mounting Style | Through Hole | Through Hole | - |
| Package / Case | TO-220-3 | TO-220-3 | - |
| Transistor Polarity | NPN | NPN | - |
| Configuration | Single | Single | - |
| Collector Emitter Voltage VCEO Max | 400 V | 450 V | - |
| Collector Base Voltage VCBO | 850 V | 1 kV | - |
| Maximum DC Collector Current | 8 A | 8 A | - |
| Minimum Operating Temperature | - 65 C | - 65 C | - |
| Maximum Operating Temperature | + 150 C | + 150 C | - |
| Height | 9.4 mm (Max) | 9.4 mm (Max) | - |
| Length | 10.1 mm (Max) | 10.1 mm (Max) | - |
| Packaging | Tube | Tube | - |
| Width | 4.7 mm (Max) | 4.7 mm (Max) | - |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | - |
| Continuous Collector Current | 8 A | 8 A | - |
| Pd Power Dissipation | 100 W | 100 W | - |
| Product Type | BJTs - Bipolar Transistors | BJTs - Bipolar Transistors | - |
| Factory Pack Quantity | 50 | 50 | - |
| Subcategory | Transistors | Transistors | - |
| Unit Weight | 0.080072 oz | 0.080072 oz | - |
| Collector Emitter Saturation Voltage | - | 1.5 V | - |