2N3442G Equivalent & Substitute Parts

Part Overview

The 2N3442G is an NPN bipolar junction transistor manufactured by onsemi, rated for 140 V collector-emitter breakdown voltage and 10 A maximum collector current in a TO-204 (TO-3) through-hole package. This device is classified as obsolete, indicating discontinued production and limited availability. Equivalent and substitute parts are necessary to maintain design continuity and ensure component procurement for applications requiring NPN power transistor functionality within specified electrical and thermal parameters.

Substiute Parts

2N3442G

onsemiIn Stock: 19292N3442G Datasheet

Current PartRFQ

MJ15015G

onsemiIn Stock: 200524MJ15015G Datasheet

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2N3442

Microchip TechnologyIn Stock: 8702N3442 Datasheet

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JANTX2N3442

Microchip TechnologyIn Stock: 1351JANTX2N3442 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N3442G is determined by electrical parameter compatibility within the following criteria:

Primary Substitution Parameters:

• Transistor type (NPN)
• Collector-emitter breakdown voltage rating (minimum 140 V for direct substitution)
• Maximum collector current (minimum 10 A for direct substitution)
• DC current gain (hFE) at specified operating points
• Saturation voltage characteristics
• Through-hole mounting in TO-204 (TO-3) package

Substitution Logic: Parts are grouped as equivalent when they maintain the same transistor type, meet or exceed voltage and current ratings, and are housed in compatible through-hole packages. Parts with lower voltage or current ratings are classified as restricted substitutes and require application-level verification. Parts with higher ratings and improved specifications are classified as direct substitutes when electrical characteristics remain within acceptable operating margins.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Preferred):

The 2N3442 (Microchip Technology) and JANTX2N3442 (Microchip Technology) are direct electrical equivalents to the 2N3442G. Both parts maintain identical voltage and current ratings (140 V, 10 A), matching DC current gain specifications (20 @ 3A, 4V), and are housed in compatible TO-204 (TO-3) packages. The JANTX2N3442 variant includes military-grade qualification per MIL-PRF-19500/307, providing enhanced reliability for applications requiring military or aerospace standards. Both Microchip variants are in active production status, ensuring long-term availability.

Restricted Substitute (Voltage Derating Required):

The MJ15015G (onsemi) operates at a reduced collector-emitter breakdown voltage of 120 V compared to the 2N3442G specification of 140 V. This 20 V reduction requires application-level assessment to confirm compatibility with circuit maximum voltage conditions. The MJ15015G provides enhanced current handling (15 A versus 10 A) and power dissipation (180 W versus 117 W), making it suitable for applications where voltage derating is acceptable and higher current capacity is beneficial. The MJ15015G is in active production status with ROHS3 compliance.

Compliance Considerations:

The 2N3442G and MJ15015G (onsemi) are ROHS3 compliant. The 2N3442 and JANTX2N3442 (Microchip) are RoHS non-compliant. Selection between compliant and non-compliant variants depends on end-product regulatory requirements. All four parts are REACH unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the MJ15015G directly replace the 2N3442G in all applications?

A: The MJ15015G is electrically compatible for applications where the collector-emitter voltage does not exceed 120 V. The 2N3442G is rated to 140 V. Applications operating at voltages between 120 V and 140 V require circuit redesign or voltage derating analysis. The MJ15015G provides superior current and power handling, making it suitable for applications within its voltage specification.

Q: What is the difference between the 2N3442 and JANTX2N3442?

A: Both parts are manufactured by Microchip Technology with identical electrical specifications (140 V, 10 A, 20 hFE @ 3A, 4V). The JANTX2N3442 is qualified to military standard MIL-PRF-19500/307 and supplied in bulk packaging, whereas the 2N3442 is a commercial-grade variant. The JANTX2N3442 is specified for applications requiring military-grade reliability and traceability.

Q: Are all substitute parts available in the same TO-3 package?

A: Yes. All four parts (2N3442G, MJ15015G, 2N3442, and JANTX2N3442) are housed in TO-204 (TO-3) through-hole packages with identical mechanical footprints, enabling direct physical substitution without PCB redesign.

Q: What is the impact of the lower saturation voltage in the Microchip variants?

A: The 2N3442 and JANTX2N3442 exhibit lower saturation voltage (1 V @ 300mA, 3A) compared to the 2N3442G (5 V @ 2A, 10A). Lower saturation voltage reduces power dissipation in saturated switching applications, improving efficiency. This characteristic makes the Microchip variants advantageous for high-frequency switching circuits where saturation losses are critical.

Q: Which substitute part offers the best long-term availability?

A: The MJ15015G (onsemi) and 2N3442 (Microchip) are both in active production status with substantial inventory levels (200,500 and 812 units respectively). Both parts are suitable for long-term design commitments. The JANTX2N3442 is also active with 1,271 units in stock and military qualification for specialized applications.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. The 2N3442G and MJ15015G are ROHS3 compliant. The 2N3442 and JANTX2N3442 are RoHS non-compliant. Product selection must align with end-product regulatory requirements and customer specifications regarding hazardous substance restrictions.