| PartNumber | BD681STU | BD681S |
| Description | Darlington Transistors NPN Epitaxial Sil | Darlington Transistors NPN Epitaxial Sil |
| Manufacturer | ON Semiconductor | ON Semiconductor |
| Product Category | Darlington Transistors | Darlington Transistors |
| RoHS | Y | Y |
| Configuration | Single | Single |
| Transistor Polarity | NPN | NPN |
| Collector Emitter Voltage VCEO Max | 100 V | 100 V |
| Emitter Base Voltage VEBO | 5 V | 5 V |
| Collector Base Voltage VCBO | 100 V | 100 V |
| Maximum DC Collector Current | 4 A | 4 A |
| Maximum Collector Cut off Current | 200 uA | 200 uA |
| Pd Power Dissipation | 40 W | 40 W |
| Mounting Style | Through Hole | Through Hole |
| Package / Case | TO-126 | TO-126 |
| Maximum Operating Temperature | + 150 C | + 150 C |
| Series | BD681 | BD681 |
| Packaging | Tube | Bulk |
| Height | 11 mm | 11 mm |
| Length | 8 mm | 8 mm |
| Width | 3.25 mm | 3.25 mm |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild |
| Continuous Collector Current | 4 A | 4 A |
| DC Collector/Base Gain hfe Min | 750 | 750 |
| Product Type | Darlington Transistors | Darlington Transistors |
| Factory Pack Quantity | 1920 | 2000 |
| Subcategory | Transistors | Transistors |
| Part # Aliases | BD681STU_NL | BD681S_NL |
| Unit Weight | 0.026843 oz | 0.026843 oz |