The N-Channel JFET Switch 2N4391-2N4393/PN4391-PN4393/SST4391-SST4393 is a N-Channel JFET Switch produced by Toshiba. Its features are rds(on)<300 Ohms (2N4391), ID(OFF)<100pA, and it can switch ±10VAC with ±15V supplies.
The 2N4391 family are N‑Channel JFET switches offered in TO‑18, TO‑92, and SOT‑23 packages. Features include low on‑resistance (<300 Ω for 2N4391), low off‑state leakage (<100 pA), and the ability to switch +10 VAC with +15 V supplies.
The datasheet lists absolute maximum ratings such as -40 V gate‑source voltage, storage temperature from -65 °C to +200 °C, and power dissipation up to 1.8 W (TO‑18). Electrical characteristics, including drain‑source on‑voltage (0.4 V) and various capacitances, are provided for design reference.
| On‑Resistance (rds(on)) | <300 Ω (2N4391) |
|---|---|
| Gate‑Source Voltage | -40 V |
| Drain‑Source ON Voltage | 0.4 V |
| Power Dissipation (TO‑18) | 1.8 W |
| Storage Temperature Range | -65 °C to +200 °C |
| Operating Temperature Range | -55 °C to +200 °C |
The maximum gate‑source (or gate‑drain) voltage is -40 V.
The drain‑source on‑state voltage is 0.4 V.
The devices can be stored from -65 °C up to +200 °C.