J109,126

Overview

The NXP J109,126 is an N-channel silicon junction field-effect transistor (JFET) housed in a TO-92 package. It serves as a symmetrical device with interchangeable drain and source connections. Key electrical parameters include a drain-source voltage of ±25 V and a gate-source cut-off voltage ranging from -2 V to -6 V. The typical drain current at zero gate voltage is 40 mA, while the maximum on-state resistance is 12 Ω. Total power dissipation reaches 400 mW up to 50 °C ambient temperature. Dynamic characteristics feature input capacitance values between 50 pF and 85 pF at 1 MHz.

Feature Summary

• High-speed switching capability for rapid signal processing
• Symmetrical design allowing interchangeable drain and source connections
• Low on-state resistance at zero gate voltage for efficient conduction

Applications

• Analog switches
• Choppers
• Commutators

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm the ordering suffix matches the required tolerance and packaging format. Ensure handling procedures protect the gate-source input from static discharge during transport. Cross-reference part numbers with current distributor catalogs to confirm availability status.

Selection Notes

Select this component based on specific gate-source cut-off voltage requirements within the -2 V to -6 V range. Evaluate the on-state resistance limit of 12 Ω against circuit impedance needs. Consider the 400 mW power dissipation rating relative to thermal management constraints. Verify compatibility with analog switching frequencies given the specified dynamic capacitance values.

Part Context

This device belongs to a family of N-channel silicon junction FETs that includes the J108 and J110 variants. These components share similar structural designs but differ in threshold voltage and on-resistance characteristics. The series provides options for various analog switching applications requiring low distortion and high speed.

Replacement Considerations

Direct substitutes may include other N-channel JFETs with comparable pinouts and electrical ratings. Verify that replacement devices meet the ±25 V breakdown voltage and 40 mA drain current specifications. Ensure the alternative component supports the TO-92 package form factor for mechanical compatibility.