2N4070 Equivalent & Substitute Parts

Part Overview

The 2N4070 is an NPN bipolar junction transistor (BJT) manufactured by Microchip Technology, designed for power switching and amplification applications. This device features a maximum collector current of 10 A, collector-emitter breakdown voltage of 100 V, and maximum power dissipation of 65 W in a Through Hole TO-3 package. The part maintains Active product status with 1033 units in current inventory. Substitution becomes necessary when the 2N4070 reaches end-of-life, when alternative electrical characteristics better suit application requirements, or when packaging or compliance specifications differ from design constraints.

Substiute Parts

2N4070

Microchip TechnologyIn Stock: 10872N4070 Datasheet

Current PartRFQ

2N3442 PBFREE

Central Semiconductor CorpIn Stock: 10012N3442 PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N4070 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor Type: Must be NPN configuration
• Current - Collector (Ic) (Max): Substitute must support minimum 10 A
• Voltage - Collector Emitter Breakdown (Max): Substitute must support minimum 100 V
• Power - Max: Substitute must support minimum 65 W
• Operating Temperature Range: Substitute must cover -65°C to 200°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Must be Through Hole
• Package / Case: Must be TO-204AA or TO-3

The 2N3442 PBFREE qualifies as a substitute because it meets or exceeds all electrical parameters (10 A collector current, 140 V breakdown voltage, 117 W power rating) and maintains identical mechanical specifications (Through Hole mounting, TO-3 package). The substitute part operates within the required temperature range and shares the same ECCN and HTSUS classifications.

Parameter Comparison

Engineering Selection Recommendations

2N4070 (Primary Selection)

The 2N4070 remains the preferred component for new designs and ongoing production. This part maintains Active product status with established supply availability (1033 units in stock). The device is manufactured by Microchip Technology, a major semiconductor supplier with established quality and reliability standards. The 2N4070 carries REACH Unaffected status and EAR99 export classification, suitable for standard commercial applications.

2N3442 PBFREE (Substitute Selection)

The 2N3442 PBFREE qualifies as a direct electrical and mechanical substitute. This part exceeds the electrical performance envelope of the 2N4070 with higher breakdown voltage (140 V versus 100 V) and greater power dissipation capability (117 W versus 65 W). The 2N3442 PBFREE achieves ROHS3 compliance, providing enhanced environmental and regulatory alignment for applications requiring lead-free components. However, the 2N3442 PBFREE carries Obsolete product status, indicating limited long-term availability. This part is suitable for replacement applications or legacy system maintenance where supply of the original 2N4070 is constrained.

Selection Criteria Summary:

• Use 2N4070 for new designs and applications requiring long-term supply continuity
• Use 2N3442 PBFREE for replacement or retrofit applications where the 2N4070 is unavailable
• Both parts share identical mechanical interfaces and thermal operating ranges
• The 2N3442 PBFREE provides superior electrical headroom for applications operating near maximum ratings

Frequently Asked Questions (FAQ)

Q: Can the 2N3442 PBFREE directly replace the 2N4070 in existing circuits?

A: Yes. Both transistors are NPN BJTs with identical collector current ratings (10 A), matching Through Hole TO-3 package configurations, and overlapping operating temperature ranges (-65°C to 200°C). The 2N3442 PBFREE exceeds the electrical specifications of the 2N4070 (140 V breakdown versus 100 V, 117 W power versus 65 W), making it electrically compatible for direct substitution. Pin-to-pin compatibility is maintained in the TO-3 package.

Q: What is the difference in product status between these parts?

A: The 2N4070 maintains Active status, indicating current production and established supply channels. The 2N3442 PBFREE carries Obsolete status, meaning the manufacturer has discontinued production. Active parts are preferred for new designs; Obsolete parts are suitable for replacement or maintenance applications where the primary part is unavailable.

Q: Are there compliance or environmental differences between these parts?

A: The 2N3442 PBFREE achieves ROHS3 compliance and carries a Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture sensitivity constraints. The 2N4070 specifications do not include explicit RoHS or MSL data in the provided parameters. Both parts share identical REACH Unaffected status and EAR99 export classification.

Q: What packaging differences exist between these parts?

A: The 2N4070 is supplied in Bulk packaging, while the 2N3442 PBFREE is supplied in Tube packaging. Both parts use the TO-3 package case style for the actual component. Packaging type affects handling, storage, and quantity per container but does not affect electrical or mechanical compatibility.

Q: Which part should be selected for new circuit designs?

A: The 2N4070 is the recommended selection for new designs. This part maintains Active product status with established supply availability and manufacturer support. The 2N3442 PBFREE should be reserved for replacement or retrofit applications where the 2N4070 becomes unavailable.

Q: Are there performance differences in switching speed or frequency response?

A: The 2N3442 PBFREE specifies a transition frequency of 80 kHz. The 2N4070 does not include transition frequency data in the provided specifications. For applications requiring specific frequency response characteristics, the 2N3442 PBFREE provides documented switching performance at 80 kHz.

Q: What is the thermal operating range for both parts?

A: Both the 2N4070 and 2N3442 PBFREE operate across an identical junction temperature range of -65°C to 200°C (TJ). This range supports applications in industrial, automotive, and high-temperature environments without thermal derating between the two parts.