MJF2955 Equivalent & Substitute Parts

Part Overview

The MJF2955 is a PNP bipolar junction transistor (BJT) rated for 90 V collector-emitter breakdown voltage and 10 A maximum collector current. Housed in a TO-220-3 Full Pack through-hole package, this device is designed for general-purpose switching and amplification applications requiring moderate power dissipation up to 2 W.

The MJF2955 carries an obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production builds, repairs, and system upgrades.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	10	A
Voltage - Collector Emitter Breakdown (Max)	90	V
Vce Saturation (Max) @ Ib, Ic	2.5V @ 3.3A, 10A	V
Current - Collector Cutoff (Max)	1	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	20 @ 4A, 4V	—
Power - Max	2	W
Frequency - Transition	2	MHz
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-220-3 Full Pack	—

Substitute Part Grouping Explanation

Substitution of the MJF2955 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Criteria:

Transistor polarity: PNP
Maximum collector current: 10 A
Maximum collector-emitter breakdown voltage: 90 V
Saturation voltage characteristics: 2.5 V @ 3.3 A, 10 A
Collector cutoff current: 1 µA maximum
DC current gain (hFE): minimum 20 @ 4 A, 4 V
Maximum power dissipation: 2 W
Transition frequency: 2 MHz

Mechanical Criteria:

Package type: TO-220-3 Full Pack
Mounting method: Through Hole

The MJF2955G meets all specified electrical and mechanical parameters and qualifies as a direct substitute. The primary distinction between the MJF2955 and MJF2955G is product status and compliance certification, not functional performance.

Parameter Comparison

Parameter	MJF2955	MJF2955G	Match
Transistor Type	PNP	PNP	✓
Current - Collector (Ic) (Max)	10 A	10 A	✓
Voltage - Collector Emitter Breakdown (Max)	90 V	90 V	✓
Vce Saturation (Max) @ Ib, Ic	2.5V @ 3.3A, 10A	2.5V @ 3.3A, 10A	✓
Current - Collector Cutoff (Max)	1 µA	1 µA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	20 @ 4A, 4V	20 @ 4A, 4V	✓
Power - Max	2 W	2 W	✓
Frequency - Transition	2 MHz	2 MHz	✓
Operating Temperature Range	-55 to 150°C (TJ)	-55 to 150°C (TJ)	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack	✓
Product Status	Obsolete	Active	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

MJF2955G is the direct functional equivalent of the MJF2955. All electrical parameters, mechanical specifications, and thermal characteristics are identical.

Product Status Consideration: The MJF2955 is classified as obsolete, while the MJF2955G maintains active product status. For new designs and ongoing production, MJF2955G is the appropriate selection to ensure long-term component availability.

Compliance Consideration: The MJF2955G is ROHS3 compliant, whereas the MJF2955 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements mandating RoHS compliance, MJF2955G is the required choice.

Packaging Consideration: Both parts are supplied in TO-220-3 Full Pack through-hole packages. The MJF2955G is supplied in tube packaging, while the MJF2955 packaging format is not specified. This distinction does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can MJF2955G be used as a direct replacement for MJF2955 in existing designs?

A: Yes. The MJF2955G is electrically and mechanically identical to the MJF2955. All electrical parameters, including collector current, breakdown voltage, saturation characteristics, and frequency response, are equivalent. The TO-220-3 Full Pack through-hole package is identical. No circuit modifications are required.

Q: What is the primary reason to transition from MJF2955 to MJF2955G?

A: The MJF2955 is obsolete, creating supply chain risk. The MJF2955G is an active product with confirmed availability. Additionally, MJF2955G is ROHS3 compliant, meeting modern regulatory requirements.

Q: Are there any thermal or performance differences between MJF2955 and MJF2955G?

A: No. Both devices operate across the same temperature range (-55°C to 150°C junction temperature) and dissipate identical maximum power (2 W). Thermal performance is equivalent.

Q: Does the packaging format (tube vs. other) affect electrical performance?

A: No. Packaging format affects only handling, storage, and logistics. Electrical and mechanical specifications remain unchanged. The TO-220-3 Full Pack through-hole configuration is identical for both parts.

Q: What parameters must match for a part to substitute for MJF2955?

A: A substitute must match all of the following: PNP polarity, 10 A maximum collector current, 90 V breakdown voltage, 2.5 V saturation voltage at specified conditions, 1 µA cutoff current, 20 minimum hFE at specified conditions, 2 W maximum power, 2 MHz transition frequency, -55°C to 150°C operating range, and TO-220-3 Full Pack through-hole package.

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