MPF102G Equivalent & Substitute Parts

Part Overview

The MPF102G is an RF MOSFET JFET manufactured by onsemi, designed for RF applications in a TO-92 through-hole package. This device operates at a rated voltage of 25V with a maximum drain current of 20mA. The MPF102G is classified as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, package configuration, and thermal characteristics.

Substiute Parts

MPF102G

onsemiIn Stock: 879MPF102G Datasheet

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J109

onsemiIn Stock: 2350J109 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete MPF102G is based on the following critical parameters that must be maintained or exceeded in equivalent devices:

Electrical Compatibility Criteria:

• Technology: N-Channel JFET
• Voltage Rating: 25V minimum (V(BR)GSS or equivalent)
• Current Handling: Drain current capability at or above 20mA
• Package Configuration: TO-92-3 or TO-226-3 through-hole mounting

Regulatory & Environmental Criteria:

• REACH compliance status
• Moisture sensitivity classification
• RoHS compliance status (for new active parts)

The J109 substitute part meets all substitution criteria through identical N-Channel JFET technology, matching 25V voltage rating, superior current handling (40mA @ 15V), compatible TO-92-3 package, and active product status with full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The J109 is the direct substitute for the obsolete MPF102G based on the following engineering criteria:

Product Status Alignment: The J109 is an active product with full manufacturing support, whereas the MPF102G is obsolete. This transition is necessary for supply chain continuity and long-term component availability.

Electrical Equivalence: Both devices are N-Channel JFETs with identical 25V voltage ratings. The J109 provides superior current handling (40mA @ 15V versus 20mA specification), ensuring compatibility with existing circuit designs while offering enhanced performance margin.

Package Compatibility: Both parts utilize the TO-92-3 (TO-226-3) through-hole package, enabling direct mechanical and electrical substitution without PCB redesign.

Regulatory Compliance: The J109 maintains REACH Unaffected status consistent with the MPF102G and adds ROHS3 compliance, meeting current environmental and regulatory requirements for new production.

Thermal Performance: The J109 specifies a maximum power dissipation of 625mW with an operating temperature range of -55°C to 150°C, providing adequate thermal headroom for RF applications.

Frequently Asked Questions (FAQ)

Q: Can the J109 be used as a direct replacement for the MPF102G in existing designs?

A: Yes. The J109 is electrically and mechanically compatible with the MPF102G. Both devices are N-Channel JFETs with 25V ratings in identical TO-92-3 packages. The J109 provides equal or superior performance across all specified parameters.

Q: What are the key differences between the MPF102G and J109?

A: The primary difference is product status: the MPF102G is obsolete, while the J109 is active. The J109 offers higher drain current capability (40mA @ 15V versus 20mA), specified power dissipation (625mW), and RoHS3 compliance. Both maintain identical voltage ratings and package configurations.

Q: Are there any circuit modifications required when substituting the J109 for the MPF102G?

A: No circuit modifications are required. The J109 is a direct substitute with compatible pinout, voltage rating, and current handling. The enhanced specifications of the J109 ensure compatibility with existing circuit designs.

Q: What is the package configuration for both parts?

A: Both the MPF102G and J109 use the TO-92-3 (TO-226-3) through-hole package. This is a three-lead configuration suitable for through-hole PCB mounting.

Q: Does the J109 meet current environmental compliance standards?

A: Yes. The J109 is ROHS3 compliant and maintains REACH Unaffected status, meeting current environmental and regulatory requirements for electronic components.

Q: What is the operating temperature range for the J109?

A: The J109 operates across a temperature range of -55°C to 150°C (junction temperature), providing adequate thermal performance for RF applications across industrial and commercial operating conditions.

Q: Is the J109 available in the same packaging options as the MPF102G?

A: Yes. The J109 is supplied in the TO-92-3 package, identical to the MPF102G. Both parts are through-hole mounted devices suitable for conventional PCB assembly processes.