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| PartNumber | 2N4858 | 2N4858A | 2N4858UB |
| Description | JFET JFET N-Channel -30V 1.8W 10mW 50mA | JFET Leaded JFET General Purpose | JFET JFETs |
| Manufacturer | InterFET | Central Semiconductor | Microchip |
| Product Category | JFET | JFET | JFET |
| RoHS | Y | Y | N |
| Technology | Si | Si | - |
| Mounting Style | Through Hole | Through Hole | - |
| Package / Case | TO-18-3 | TO-18 | - |
| Transistor Polarity | N-Channel | N-Channel | - |
| Configuration | Single | Single | - |
| Vds Drain Source Breakdown Voltage | 15 V | 40 V | - |
| Vgs Gate Source Breakdown Voltage | - 40 V | 20 V | - |
| Drain Source Current at Vgs=0 | 80 mA | 8 mA to 80 mA | - |
| Id Continuous Drain Current | 500 pA | 5 mA | - |
| Rds On Drain Source Resistance | 60 Ohms | 60 Ohms | - |
| Pd Power Dissipation | 1.8 W | 360 mW | - |
| Series | 2N485 | 2N4858 | - |
| Packaging | Bulk | Bulk | Waffle |
| Type | JFET | JFET | JFET |
| Brand | InterFET | Central Semiconductor | Microchip / Microsemi |
| Gate Source Cutoff Voltage | - 4 V | 800 mV to 4 V | - |
| Factory Pack Quantity | 1 | 2000 | 1 |
| Minimum Operating Temperature | - | - 65 C | - |
| Maximum Operating Temperature | - | + 200 C | - |
| Maximum Drain Gate Voltage | - | 40 V | - |
| Part # Aliases | - | 2N4858A BK | - |
| Unit Weight | - | 0.011020 oz | - |