2N3442 Equivalent & Substitute Parts

Part Overview

The 2N3442 is an NPN bipolar junction transistor (BJT) rated for 140 V collector-emitter breakdown voltage and 10 A maximum collector current. Manufactured by onsemi in TO-204 (TO-3) through-hole package, this device is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	140	V
Current - Collector (Ic) (Max)	10	A
Power - Max	117	W
DC Current Gain (hFE) (Min) @ Ic, Vce	20 @ 3A, 4V	—
Frequency - Transition	80	MHz
Operating Temperature Range	-65 to 200	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-204AA, TO-3	—

Substitute Part Grouping Explanation

Substitution of the 2N3442 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN (must match)
Voltage - Collector Emitter Breakdown (Max): 140 V (must match or exceed)
Current - Collector (Ic) (Max): 10 A (must match or exceed)
DC Current Gain (hFE) (Min) @ Ic, Vce: 20 @ 3A, 4V (must meet or exceed)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (must match)
Package / Case: TO-204AA or TO-3 (must match)

Operational Compatibility Criteria:

Operating Temperature Range: Must support the required application temperature window

Substitute parts identified below satisfy all electrical and mechanical parameters required for direct replacement in applications designed for the 2N3442. Differences in power dissipation rating, saturation voltage characteristics, and transition frequency do not preclude substitution when the substitute part meets or exceeds the minimum electrical requirements.

Parameter Comparison

Parameter	2N3442 (onsemi)	2N3442 (Microchip)	JANTXV2N3442 (Microchip)
Manufacturer	onsemi	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	140 V	140 V	140 V
Current - Collector (Ic) (Max)	10 A	10 A	10 A
DC Current Gain (hFE) (Min) @ Ic, Vce	20 @ 3A, 4V	20 @ 3A, 4V	20 @ 3A, 4V
Operating Temperature Range	-65 to 200 °C (TJ)	-55 to 200 °C (TJ)	-55 to 200 °C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-204AA, TO-3	TO-204AA, TO-3	TO-204AA, TO-3
RoHS Status	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

2N3442 (Microchip Technology): This part is an active-status equivalent manufactured by Microchip Technology. It maintains identical electrical specifications for voltage, current, and DC current gain. The operating temperature range is narrower (-55 to 200 °C versus -65 to 200 °C), which may be a consideration for applications requiring extended low-temperature operation below -55 °C. This variant is suitable for general commercial and industrial applications.

JANTXV2N3442 (Microchip Technology): This part carries military-grade qualification under MIL-PRF-19500/370 and is manufactured by Microchip Technology. It meets all electrical and mechanical requirements of the original 2N3442. The military qualification and active product status make this variant appropriate for defense, aerospace, and high-reliability applications where component traceability and qualification documentation are required. The operating temperature range is -55 to 200 °C.

Both substitute parts are available from active manufacturers, ensuring long-term supply continuity compared to the obsolete onsemi 2N3442.

Frequently Asked Questions (FAQ)

Q: Can the Microchip 2N3442 directly replace the onsemi 2N3442?

A: Yes. Both parts are NPN transistors with identical voltage (140 V), current (10 A), and DC current gain (20 @ 3A, 4V) specifications. Both use TO-204AA/TO-3 through-hole packaging. The Microchip variant has a narrower operating temperature range (-55 to 200 °C versus -65 to 200 °C), which does not affect applications operating within -55 to 200 °C.

Q: What is the difference between the standard 2N3442 and JANTXV2N3442?

A: The JANTXV2N3442 is a military-qualified variant manufactured under MIL-PRF-19500/370. Both parts share identical electrical specifications and TO-3 packaging. The JANTXV designation indicates military-grade qualification and enhanced traceability documentation. Selection between the two depends on application requirements for military qualification and documentation.

Q: Are there any package compatibility issues when substituting these parts?

A: No. All three parts use the same TO-204AA/TO-3 through-hole package. Pin configuration and mechanical dimensions are identical, allowing direct socket replacement without PCB modification.

Q: Why is the onsemi 2N3442 listed as obsolete?

A: The onsemi 2N3442 has reached end-of-life status. Microchip Technology continues to manufacture equivalent parts under the same part number and military-qualified variants, ensuring design continuity and component availability.

Q: Does the lower power rating of the Microchip variants affect substitution?

A: The Microchip 2N3442 variants are rated at 6 W maximum power dissipation, compared to 117 W for the onsemi original. Substitution is valid when the application's actual power dissipation requirement does not exceed the substitute part's rating. Applications requiring sustained power dissipation above 6 W require thermal management review or alternative component selection.

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

A: All three parts are RoHS non-compliant and REACH Unaffected. The JANTXV2N3442 carries additional military qualification under MIL-PRF-19500/370. Selection should be based on application compliance requirements.

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