| PartNumber | BF256B | BF256A | BF256AG |
| Description | JFET N-Channel Transistor | JFET | JFET SS JFET NCH 30V |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | JFET | JFET | JFET |
| RoHS | Y | N | Y |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Package / Case | TO-92 | TO-92 | TO-92 |
| Transistor Polarity | N-Channel | N-Channel | N-Channel |
| Configuration | Single | Single | Single |
| Vgs Gate Source Breakdown Voltage | - 30 V | - 30 V | 30 V |
| Drain Source Current at Vgs=0 | 1.5 mA to 7 mA | - | - |
| Pd Power Dissipation | 350 mW | 350 mW | 360 mW |
| Series | BF256B | - | - |
| Packaging | Bulk | - | - |
| Type | JFET | JFET | JFET |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | ON Semiconductor |
| Forward Transconductance Min | 0.0045 S | 0.0045 S | - |
| Factory Pack Quantity | 10000 | - | - |
| Unit Weight | 0.007055 oz | 0.007090 oz | 0.016000 oz |
| Id Continuous Drain Current | - | 3 mA | - |
| Vds Drain Source Breakdown Voltage | - | - | 30 V |
| Gate Source Cutoff Voltage | - | - | - 7.5 V |