2N3819 Equivalent & Substitute Parts

Part Overview

The 2N3819 is an RF MOSFET JFET N-Channel transistor manufactured by onsemi, housed in a TO-92 (TO-226-3) through-hole package. This device is rated for 25 V operation with a maximum current rating of 100 mA and is designed for RF applications. The 2N3819 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

2N3819

onsemiIn Stock: 19912N3819 Datasheet

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MMBF5484

onsemiIn Stock: 19348MMBF5484 Datasheet

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2N3819

NTE Electronics, IncIn Stock: 20212N3819 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N3819 is determined by the following critical parameters:

Technology & Configuration: All substitute parts must be N-Channel JFET devices to maintain functional equivalence in RF circuit applications.

Voltage Rating: Substitute parts must have a rated voltage of 25 V or higher to ensure safe operation within the original design envelope.

Mounting Type & Package: Substitutes are grouped into two categories based on mounting requirements:

• Through-Hole Substitutes: Maintain the same physical form factor for direct board-level replacement
• Surface-Mount Substitutes: Require PCB redesign but offer alternative sourcing options

Current Rating: The 100 mA current rating of the 2N3819 establishes a minimum threshold for substitute selection. Parts with lower current ratings are not suitable for applications requiring the full current capacity.

Product Status & Compliance: Active product status and RoHS compliance are secondary selection criteria, applicable when design constraints permit component modernization.

Parameter Comparison

Engineering Selection Recommendations

Through-Hole Direct Replacement: The 2N3819 manufactured by NTE Electronics, Inc. provides a through-hole substitute with identical package configuration (TO-92-3). Both the onsemi and NTE versions maintain the same 25 V voltage rating and through-hole mounting type, enabling direct PCB substitution without layout modification. The NTE variant carries active product status, ensuring continued availability. Both versions remain RoHS non-compliant, maintaining consistency with legacy design requirements.

Surface-Mount Alternative: The MMBF5484 offers an active, ROHS3-compliant alternative for designs permitting surface-mount technology. This device maintains N-Channel JFET configuration and 25 V voltage rating. However, the MMBF5484 current rating of 5 mA is significantly lower than the 2N3819's 100 mA specification. Surface-mount substitution requires PCB redesign and is suitable only for applications where the reduced current capacity does not compromise circuit performance.

Compliance Considerations: When RoHS compliance is a design requirement, the MMBF5484 is the only substitute meeting ROHS3 standards. Conversely, when legacy RoHS non-compliant designs must be maintained, the NTE Electronics 2N3819 provides the most direct path to continued procurement.

Frequently Asked Questions (FAQ)

Q: Can the MMBF5484 directly replace the 2N3819 on the same PCB?

A: No. The MMBF5484 uses SOT-23-3 surface-mount packaging, while the 2N3819 uses TO-92-3 through-hole packaging. Direct board-level substitution requires the NTE Electronics 2N3819, which maintains identical through-hole package geometry.

Q: Is the MMBF5484 suitable for all 2N3819 applications?

A: The MMBF5484 is suitable only for applications where the maximum current requirement does not exceed 5 mA. The 2N3819 supports 100 mA operation. Applications requiring the full 100 mA current capacity must use the through-hole 2N3819 variants.

Q: What is the difference between the onsemi and NTE Electronics 2N3819 versions?

A: Both versions are N-Channel JFET devices in TO-92-3 packages with 25 V ratings. The primary difference is manufacturer and product status: onsemi's version is obsolete, while NTE Electronics' version is active. The NTE variant ensures ongoing availability for procurement.

Q: Does the MMBF5484 offer any advantages over the 2N3819?

A: The MMBF5484 provides ROHS3 compliance, active product status, and specified RF performance parameters (400 MHz frequency, 4 dB noise figure). These advantages apply only to designs where surface-mount technology and reduced current capacity are acceptable.

Q: Are there any voltage or configuration differences between the substitute parts?

A: All three parts (onsemi 2N3819, NTE 2N3819, and MMBF5484) share identical voltage ratings (25 V) and N-Channel JFET configuration. Voltage and configuration compatibility is confirmed across all substitutes.

Q: What packaging considerations apply when selecting a substitute?

A: Through-hole applications must use either the onsemi or NTE Electronics 2N3819 to maintain existing PCB layouts. Surface-mount designs can incorporate the MMBF5484, but this requires PCB redesign and verification that the 5 mA current rating meets application requirements.