| PartNumber | BULB49DT4 | BULB39D-1 | BULB128-1 |
| Description | Bipolar Transistors - BJT Hi Vltg Fast Swtchng NPN Pwr Transistor | Bipolar Transistors - BJT HI VLTG FAST SWITCH NPN PWR TRANSISTOR | TRANS NPN 400V 4A I2PAK |
| Manufacturer | STMicroelectronics | STMicroelectronics | ST |
| Product Category | Bipolar Transistors - BJT | Bipolar Transistors - BJT | Transistors (BJT) - Single |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | D2PAK-3 | D2PAK-3 | - |
| Transistor Polarity | NPN | NPN | - |
| Configuration | Single | Single | - |
| Collector Emitter Voltage VCEO Max | 450 V | 450 V | - |
| Collector Base Voltage VCBO | 850 V | 800 V | - |
| Emitter Base Voltage VEBO | 10 V | 9 V | - |
| Maximum DC Collector Current | 5 A | 4 A | - |
| Minimum Operating Temperature | - 65 C | - 65 C | - |
| Maximum Operating Temperature | + 150 C | + 150 C | - |
| Series | BULB49D | BULB39 | - |
| Height | 4.6 mm (Max) | 4.6 mm | - |
| Length | 10.4 mm (Max) | 10.4 mm | - |
| Packaging | Reel | Tube | - |
| Width | 9.35 mm (Max) | 9.35 mm | - |
| Brand | STMicroelectronics | STMicroelectronics | - |
| Pd Power Dissipation | 80000 mW | 70000 mW | - |
| Product Type | BJTs - Bipolar Transistors | BJTs - Bipolar Transistors | - |
| Factory Pack Quantity | 1000 | 1000 | - |
| Subcategory | Transistors | Transistors | - |
| Unit Weight | 0.070548 oz | 0.079014 oz | - |
| Continuous Collector Current | - | 4 A | - |