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| PartNumber | BUL128D-B | BUL128-K | BUL128 |
| Description | Bipolar Transistors - BJT HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR | Motor / Motion / Ignition Controllers & Drivers HI VLTG FAST SWITCH NPN PWR TRANSISTOR | TRANS NPN 400V 4A TO-220 |
| Manufacturer | STMicroelectronics | STMicroelectronics | - |
| Product Category | Bipolar Transistors - BJT | Motor / Motion / Ignition Controllers & Drivers | - |
| RoHS | Y | Y | - |
| Mounting Style | Through Hole | Through Hole | - |
| Package / Case | TO-220-3 | TO-220-3 | - |
| Transistor Polarity | NPN | - | - |
| Configuration | Single | - | - |
| Collector Emitter Voltage VCEO Max | 400 V | - | - |
| Collector Base Voltage VCBO | 700 V | - | - |
| Emitter Base Voltage VEBO | 9 V | - | - |
| Maximum DC Collector Current | 4 A | - | - |
| Minimum Operating Temperature | - 65 C | - | - |
| Maximum Operating Temperature | + 150 C | - | - |
| Series | BUL128D-B | BUL128 | - |
| Height | 15.75 mm | - | - |
| Length | 10.4 mm | - | - |
| Packaging | Tube | Bulk | - |
| Width | 4.6 mm | - | - |
| Brand | STMicroelectronics | STMicroelectronics | - |
| Pd Power Dissipation | 70000 mW | - | - |
| Product Type | BJTs - Bipolar Transistors | Motor / Motion / Ignition Controllers & Drivers | - |
| Factory Pack Quantity | 1000 | 250 | - |
| Subcategory | Transistors | PMIC - Power Management ICs | - |
| Unit Weight | 0.211644 oz | 0.211644 oz | - |