PN4092 JFET N-Channel Transistor Equivalent & Substitute Parts

Part Overview

The PN4092 is an N-Channel JFET transistor manufactured by onsemi, rated for 40V breakdown voltage with 625 mW power dissipation in a TO-92-3 through-hole package. The device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across voltage ratings, current characteristics, and thermal operating ranges while accommodating the through-hole TO-92 package form factor.

Substiute Parts

PN4092

onsemiIn Stock: 962PN4092 Datasheet

Current PartRFQ

PN4392 TO-92 3L ROHS

Linear Integrated Systems, Inc.In Stock: 1669PN4392 TO-92 3L ROHS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PN4092 is determined by strict equivalence across the following critical parameters:

• Voltage Rating: V(BR)GSS must equal 40V to ensure gate-source breakdown protection
• Package Type: TO-92-3 through-hole configuration required for mechanical and thermal compatibility
• FET Channel Type: N-Channel topology mandatory for circuit function
• Operating Temperature Range: Must support -55°C to 150°C (TJ) minimum
• Input Capacitance: 16 pF @ 20V specification for signal integrity
• Drain Current (Idss): 15 mA @ 20V baseline for current handling

The PN4392 qualifies as a substitute based on matching voltage rating (40V), package type (TO-92-3), channel type (N-Channel), and operating temperature range (-55°C to 150°C). Variations in power dissipation (350 mW vs. 625 mW) and on-state resistance (60 Ohms vs. 50 Ohms) represent acceptable derating within the substitute's electrical envelope for applications not requiring maximum power handling.

Parameter Comparison

Engineering Selection Recommendations

The PN4392 is qualified as a direct substitute for the PN4092 based on electrical parameter equivalence and active product status. Selection of the PN4392 is appropriate for applications where:

• Gate-source voltage protection at 40V is required
• Through-hole TO-92-3 package mounting is specified
• Operating temperature range of -55°C to 150°C is required
• Input capacitance of 16 pF @ 20V is acceptable

Design review is required for applications where the PN4092's 625 mW power rating is a critical specification, as the PN4392 is rated for 350 mW maximum dissipation. Similarly, circuits optimized for the PN4092's 50 Ohm on-state resistance should be evaluated against the PN4392's 60 Ohm specification to confirm performance margins remain acceptable.

The PN4392 carries RoHS3 compliance certification, supporting environmental and regulatory requirements for modern production environments.

Frequently Asked Questions (FAQ)

Q: Can the PN4392 replace the PN4092 in all applications?

A: The PN4392 qualifies as an electrical substitute based on matching voltage rating, package type, and operating temperature range. However, applications requiring the full 625 mW power dissipation capability or optimized for 50 Ohm on-state resistance should be evaluated individually. The PN4392's 350 mW rating and 60 Ohm resistance represent acceptable derating for most general-purpose JFET applications.

Q: What is the significance of the TO-92-3 package requirement?

A: The TO-92-3 package is a three-lead through-hole configuration with specific pin spacing and thermal characteristics. Both the PN4092 and PN4392 use this identical package, ensuring mechanical compatibility with existing PCB layouts and assembly processes without modification.

Q: Why is the PN4092 listed as obsolete?

A: Obsolete status indicates the PN4092 is no longer in active production by onsemi. The PN4392 maintains active production status, providing supply continuity and long-term availability for new designs and production support.

Q: Are there differences in gate-source breakdown voltage between these parts?

A: No. Both the PN4092 and PN4392 are rated for 40V V(BR)GSS, ensuring identical gate protection characteristics and circuit behavior in this critical parameter.

Q: How do the power dissipation ratings affect circuit design?

A: The PN4092 supports 625 mW continuous dissipation, while the PN4392 is rated for 350 mW. For low-power signal applications, this difference is typically not limiting. High-power switching or linear amplification circuits should verify that the PN4392's lower rating does not exceed thermal limits under worst-case operating conditions.