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| PartNumber | BD678A | BD678AG | BD678AS |
| Description | Darlington Transistors PNP Power Darlington | Darlington Transistors 4A 60V Bipolar Power PNP | Darlington Transistors PNP Epitaxial Sil |
| Manufacturer | STMicroelectronics | ON Semiconductor | Fairchild Semiconductor |
| Product Category | Darlington Transistors | Darlington Transistors | Transistors (BJT) - Single, Pre-Biased |
| RoHS | Y | Y | - |
| Configuration | Single | Single | Single |
| Transistor Polarity | PNP | PNP | PNP |
| Collector Emitter Voltage VCEO Max | 60 V | 60 V | - |
| Emitter Base Voltage VEBO | 5 V | 5 V | - |
| Collector Base Voltage VCBO | 60 V | 60 V | - |
| Maximum DC Collector Current | 4 A | 4 A | 4 A |
| Maximum Collector Cut off Current | 200 uA | 200 uA | 200 uA |
| Pd Power Dissipation | 40 W | - | - |
| Mounting Style | SMD/SMT | Through Hole | Through Hole |
| Package / Case | SOT-32 | SOT-23 | - |
| Maximum Operating Temperature | + 150 C | + 150 C | + 150 C |
| Series | BD678A | BD678A | - |
| Height | 10.8 mm | 11.04 mm | - |
| Length | 7.8 mm | 7.74 mm | - |
| Width | 2.7 mm | 2.66 mm | - |
| Brand | STMicroelectronics | ON Semiconductor | - |
| Continuous Collector Current | 4 A | - | - 4 A |
| DC Collector/Base Gain hfe Min | 750 | 750 | - |
| Product Type | Darlington Transistors | Darlington Transistors | - |
| Factory Pack Quantity | 2000 | 500 | - |
| Subcategory | Transistors | Transistors | - |
| Minimum Operating Temperature | - | - 55 C | - |
| Packaging | - | Bulk | Bulk |
| Unit Weight | - | 0.000282 oz | 0.026843 oz |
| Part Aliases | - | - | BD678AS_NL |
| Package Case | - | - | TO-225AA, TO-126-3 |
| Mounting Type | - | - | Through Hole |
| Supplier Device Package | - | - | TO-126 |
| Power Max | - | - | 14W |
| Transistor Type | - | - | PNP - Darlington |
| Current Collector Ic Max | - | - | 4A |
| Voltage Collector Emitter Breakdown Max | - | - | 60V |
| DC Current Gain hFE Min Ic Vce | - | - | 750 @ 2A, 3V |
| Vce Saturation Max Ib Ic | - | - | 2.8V @ 40mA, 2A |
| Current Collector Cutoff Max | - | - | 500μA |
| Frequency Transition | - | - | - |
| Pd Power Dissipation | - | - | 14 W |
| Collector Emitter Voltage VCEO Max | - | - | 60 V |
| Collector Base Voltage VCBO | - | - | 60 V |
| Emitter Base Voltage VEBO | - | - | 5 V |
| DC Collector Base Gain hfe Min | - | - | 750 |