IC Phoenix logo

Home ›  P  › P27 > PN4391

PN4391 from

Fast Delivery, Competitive Price @IC-phoenix

If you need more electronic components or better pricing, we welcome any inquiry.

PN4391

Manufacturer: SILICONIX, FSC

N-Channel JFET Switch

Partnumber Manufacturer Quantity Availability
PN4391 SILICONIX, FSC 18170 In Stock

Description and Introduction

N-Channel JFET Switch **Introduction to the PN4391 Electronic Component**  

The PN4391 is a widely used N-channel JFET (Junction Field-Effect Transistor) designed for low-power switching and amplification applications. Known for its high input impedance and low noise characteristics, it is commonly employed in signal processing, analog switching, and voltage-controlled resistor circuits.  

This component operates effectively in a range of electronic systems, including audio amplifiers, sensor interfaces, and communication devices. Its ability to function with minimal power consumption makes it suitable for battery-operated and energy-efficient designs. The PN4391 features a depletion-mode operation, meaning it conducts current when no gate voltage is applied, and requires a negative bias to turn off.  

Key specifications include a low gate leakage current, a moderate drain-source voltage rating, and a fast switching response. Engineers and hobbyists favor the PN4391 for its reliability and ease of integration into various circuit configurations.  

When selecting a JFET for precision applications, the PN4391 remains a practical choice due to its consistent performance and compatibility with standard electronic designs. Proper handling and circuit design considerations, such as gate protection and biasing, ensure optimal functionality.

Application Scenarios & Design Considerations

N-Channel JFET Switch

Alternative Part Number

  • 2N4391 --: Same JFET family with nearly identical N-channel junction FET characteristics and pinout, widely available and a direct functional substitute.
  • J111 --: N-channel JFET with comparable switching and amplifier characteristics, commonly used as a replacement in similar circuits.
  • BF256B --: N-channel JFET with similar low-noise, high-input-impedance behavior suitable for small-signal applications.
  • 2N4391 --: Same JFET family with identical N-channel junction FET characteristics and pinout, widely available and a direct functional drop-in.
  • J111 --: N-channel JFET with similar switching and amplifier characteristics; a common, low-cost substitute when exact PN4391 specs are not critical.
  • BF245A --: General-purpose N-channel JFET suitable for small-signal amplification and switching, offering comparable behavior for many PN4391 applications.
  • 2N4391 --: Same JFET family with nearly identical N-channel depletion-mode specs (Vgs(off), Idss, rds(on)); direct functional drop-in in most circuits.
  • J111 --: N-channel JFET switch with comparable on-resistance and switching behavior; widely available and often used where PN4391 switching JFETs are specified.
  • BF245A --: General-purpose N-channel JFET with similar low-noise small-signal characteristics; suitable substitute in many amplifier and switching applications with minor bias adjustment.

Request Quotation

For immediate assistance, call us at +86 533 2716050 or email [email protected]

Part Number Quantity Target Price($USD) Email Contact Person
We offer highly competitive channel pricing. Get in touch for details.

Specializes in hard-to-find components chips