2N5639RLRAG Equivalent & Substitute Parts

Part Overview

The 2N5639RLRAG is an N-Channel JFET transistor rated for 35 V breakdown voltage and 310 mW power dissipation in a Through Hole TO-92 package. This component is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates across a temperature range of -65°C to 150°C and is suitable for applications requiring low-noise signal switching and amplification in analog circuits.

Substiute Parts

2N5639RLRAG

onsemiIn Stock: 12022N5639RLRAG Datasheet

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BF256B

onsemiIn Stock: 39931BF256B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N5639RLRAG is determined by the following critical parameters:

• Device Type: N-Channel JFET technology
• Voltage Rating: Drain to Source Voltage (Vdss) of 30 V minimum
• Current Capability: Drain current (Idss) of 25 mA or greater
• Package Compatibility: Through Hole TO-92-3 (TO-226) form factor
• Power Dissipation: 310 mW or greater thermal capability
• Operating Temperature Range: -65°C to 150°C or equivalent

The BF256B meets these substitution criteria as an N-Channel JFET in TO-92-3 packaging with compatible voltage and current ratings, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The BF256B is the designated substitute for the 2N5639RLRAG based on the following factors:

• Product Status: The 2N5639RLRAG is Obsolete. The BF256B is Active and currently manufactured, ensuring supply chain availability and long-term support.
• Package Compatibility: Both components use the TO-92-3 Through Hole package, enabling direct physical replacement without PCB redesign.
• Electrical Compatibility: Both are N-Channel JFETs with 30 V Vdss rating and TO-92-3 packaging, meeting the core substitution criteria.
• Compliance: Both components are REACH Unaffected and classified under EAR99, maintaining regulatory compliance for export and use.
• Moisture Sensitivity: Both components have MSL 1 (Unlimited), indicating no moisture-related handling restrictions.

The BF256B provides functional equivalence for applications where the 2N5639RLRAG is no longer available, with the understanding that the lower Idss rating (13 mA vs. 25 mA) may require circuit evaluation in current-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the BF256B directly replace the 2N5639RLRAG without circuit modification?

A: The BF256B is pin-compatible and functionally equivalent in TO-92-3 packaging. However, the BF256B has a lower Idss rating (13 mA vs. 25 mA). Circuit evaluation is necessary to confirm suitability for applications dependent on higher drain current specifications.

Q: What is the primary reason for substitution?

A: The 2N5639RLRAG is Obsolete. The BF256B is an Active product with equivalent electrical characteristics and identical packaging, providing supply continuity.

Q: Are there any compliance or regulatory differences between these parts?

A: Both components are REACH Unaffected and classified as EAR99. No regulatory barriers exist to substitution. Both have MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What parameters must match for successful substitution?

A: Critical matching parameters are device type (N-Channel JFET), Vdss rating (30 V), package form factor (TO-92-3), and operating temperature range. The BF256B meets all these criteria.

Q: Are there any known limitations when using the BF256B as a substitute?

A: The BF256B has a lower maximum Idss specification (13 mA) compared to the 2N5639RLRAG (25 mA). Applications requiring the full 25 mA drain current capability should be evaluated to confirm the BF256B meets performance requirements.