MJF47 Equivalent & Substitute Parts

Part Overview

The MJF47 is an NPN bipolar junction transistor (BJT) manufactured by onsemi, rated for 250 V collector-emitter breakdown voltage and 1 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, indicating it has been discontinued by the manufacturer. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	250 V
Current - Collector (Ic) (Max)	1 A
Power - Max	2 W
Frequency - Transition	10 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 300mA, 10V
Vce Saturation (Max) @ Ib, Ic	1V @ 200mA, 1A
Current - Collector Cutoff (Max)	200µA
Operating Temperature Range	-65°C to 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Full Pack

Substitute Part Grouping Explanation

Substitution of the MJF47 is determined by electrical and mechanical parameter equivalence. The critical parameters that define substitutability are:

Transistor Type: NPN configuration
Voltage Rating: 250 V collector-emitter breakdown voltage
Current Rating: 1 A maximum collector current
Power Dissipation: 2 W maximum
Frequency Response: 10 MHz transition frequency
DC Current Gain: 30 (minimum) at specified conditions
Saturation Characteristics: 1 V maximum at rated conditions
Package: TO-220-3 through-hole configuration

Substitute parts must match all electrical specifications and maintain the same physical package to ensure direct replacement without circuit board modification or redesign.

Parameter Comparison

Parameter	MJF47	MJF47G
Manufacturer	onsemi	onsemi
Transistor Type	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	250 V	250 V
Current - Collector (Ic) (Max)	1 A	1 A
Power - Max	2 W	2 W
Frequency - Transition	10 MHz	10 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 300mA, 10V	30 @ 300mA, 10V
Vce Saturation (Max) @ Ib, Ic	1V @ 200mA, 1A	1V @ 200mA, 1A
Current - Collector Cutoff (Max)	200µA	200µA
Operating Temperature Range	-65°C to 150°C (TJ)	-65°C 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

The MJF47G is a direct electrical and mechanical equivalent to the MJF47. Both devices share identical electrical specifications across all rated parameters, including voltage, current, power dissipation, frequency response, and thermal operating range. Both utilize the TO-220-3 through-hole package, enabling direct board-level substitution without layout modifications.

The primary distinction between these parts is product status and regulatory compliance. The MJF47 is classified as obsolete and carries RoHS non-compliant status, while the MJF47G maintains active product status and achieves ROHS3 compliance. For new designs or applications requiring regulatory compliance with modern environmental standards, the MJF47G is the appropriate selection. For legacy system maintenance where the original MJF47 specification must be preserved, the MJF47G provides full functional equivalence while offering improved compliance posture.

Frequently Asked Questions (FAQ)

Q: Can the MJF47G be used as a direct replacement for the MJF47?

A: Yes. The MJF47G is electrically and mechanically equivalent to the MJF47. All electrical parameters, including voltage rating, current rating, power dissipation, frequency response, and thermal characteristics, are identical. The TO-220-3 package is identical, permitting direct substitution without circuit board modification.

Q: What is the primary difference between the MJF47 and MJF47G?

A: The MJF47 is classified as obsolete with RoHS non-compliant status. The MJF47G is an active product that achieves ROHS3 compliance. Electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: Both parts use the TO-220-3 through-hole package. The MJF47 is supplied in standard packaging, while the MJF47G is supplied in tube packaging. This difference does not affect electrical performance or board-level compatibility.

Q: What parameters must match for a part to be considered a substitute for the MJF47?

A: A substitute must match the following parameters: NPN transistor type, 250 V collector-emitter breakdown voltage, 1 A maximum collector current, 2 W maximum power dissipation, 10 MHz transition frequency, 30 minimum DC current gain at specified conditions, 1 V maximum saturation voltage at rated conditions, and TO-220-3 through-hole package configuration.

Q: Is the MJF47G suitable for new product designs?

A: Yes. The MJF47G is an active product with ROHS3 compliance, making it suitable for new designs. It provides full electrical equivalence to the MJF47 while meeting current regulatory requirements.

Q: Can the MJF47 and MJF47G be used interchangeably in existing circuits?

A: Yes. Both devices are electrically and mechanically identical, permitting interchangeable use in existing circuit designs without modification.

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