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| PartNumber | BU931T | BU931P | BU931 |
| Description | Bipolar Transistors - BJT NPN Power Darlington | Darlington Transistors NPN Power Darlington | Darlington Transistors NPN Power Darlington |
| Manufacturer | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Product Category | Bipolar Transistors - BJT | Darlington Transistors | Darlington Transistors |
| RoHS | Y | Y | Y |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Package / Case | TO-220-3 | TO-247 | TO-3 |
| Transistor Polarity | NPN | NPN | NPN |
| Configuration | Single | Single | Single |
| Collector Emitter Voltage VCEO Max | 400 V | 400 V | 400 V |
| Emitter Base Voltage VEBO | 5 V | 5 V | 5 V |
| Collector Emitter Saturation Voltage | 1.8 V | - | - |
| Maximum DC Collector Current | 20 A | 15 A | 15 A |
| Minimum Operating Temperature | - 65 C | - | - |
| Maximum Operating Temperature | + 175 C | + 150 C | + 150 C |
| Series | BU931T | BU931P | BU931 |
| DC Current Gain hFE Max | 300 | - | - |
| Packaging | Tube | - | Bulk |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Continuous Collector Current | 10 A | 15 A | 15 A |
| DC Collector/Base Gain hfe Min | 300 | 300 | 300 |
| Pd Power Dissipation | 125 W | 135 W | 175 W |
| Product Type | BJTs - Bipolar Transistors | Darlington Transistors | Darlington Transistors |
| Qualification | AEC-Q101 | AEC-Q101 | - |
| Factory Pack Quantity | 1000 | 600 | 100 |
| Subcategory | Transistors | Transistors | Transistors |
| Unit Weight | 0.211644 oz | 0.162260 oz | 0.225789 oz |
| Height | - | 20.15 mm | 8.7 mm |
| Length | - | 15.75 mm | 39.5 mm |
| Width | - | 5.15 mm | 26.2 mm |