MJD50 NPN Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The MJD50 is an NPN bipolar junction transistor (BJT) manufactured by onsemi, rated for 400 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface mount DPAK package. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical or superior electrical specifications are available from the same manufacturer in various packaging configurations.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	1	A
Power - Max	1.56	W
Frequency - Transition	10	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 300mA, 10V	—
Vce Saturation (Max) @ Ib, Ic	1V @ 200mA, 1A	—
Operating Temperature Range	-65 to 150	°C
Package / Case	TO-252-3, DPAK	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MJD50 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor type: NPN (polarity must match)
Voltage - Collector Emitter Breakdown (Max): 400 V (minimum requirement)
Current - Collector (Ic) (Max): 1 A (minimum requirement)
Power - Max: 1.56 W (minimum requirement)
DC Current Gain (hFE) (Min): 30 @ 300mA, 10V (minimum requirement)
Vce Saturation (Max): 1V @ 200mA, 1A (maximum allowable)
Frequency - Transition: 10 MHz (minimum requirement)
Operating Temperature Range: -65°C to 150°C (minimum requirement)

Mechanical Equivalence Criteria:

Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type: Surface Mount

Substitute parts must satisfy all electrical parameters at or above the specified minimums and maintain identical mechanical compatibility. Packaging format (tube, tape & reel, cut tape) does not affect electrical substitution but affects procurement and assembly processes.

Parameter Comparison

Parameter	MJD50	MJD50G	MJD50TF	MJD50T4G	NJVMJD50T4G
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	400 V	400 V	400 V
Current - Collector (Ic) (Max)	1 A	1 A	1 A	1 A	1 A
Power - Max	1.56 W	1.56 W	1.56 W	1.56 W	1.56 W
Frequency - Transition	10 MHz	10 MHz	10 MHz	10 MHz	10 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 300mA, 10V	30 @ 300mA, 10V	30 @ 300mA, 10V	30 @ 300mA, 10V	30 @ 300mA, 10V
Vce Saturation (Max) @ Ib, Ic	1V @ 200mA, 1A	1V @ 200mA, 1A	1V @ 200mA, 1A	1V @ 200mA, 1A	1V @ 200mA, 1A
Operating Temperature Range	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	—	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Electrical Substitutes (Identical Specifications):

MJD50G, MJD50TF, MJD50T4G, and NJVMJD50T4G are direct electrical equivalents to the MJD50, meeting all specified electrical and mechanical parameters. All substitute parts are classified as active products, ensuring long-term availability and supply chain continuity.

Compliance Advantage:

All substitute parts carry ROHS3 compliance certification, whereas the original MJD50 is RoHS non-compliant. Selection of any substitute part satisfies modern regulatory requirements for new designs and production.

Packaging Selection:

MJD50G (Tube): Suitable for manual assembly and small-volume applications
MJD50TF (Tape & Reel): Standard format for automated pick-and-place assembly
MJD50T4G (Cut Tape & Digi-Reel®): Flexible packaging for mixed-volume production
NJVMJD50T4G (Tape & Reel): Alternative tape & reel option with identical electrical specifications

Selection between packaging formats depends on assembly process requirements and procurement volume, not electrical performance.

Non-Equivalent Alternative:

MJE170G is listed as a similar part but does not qualify as a substitute. The MJE170G is a PNP transistor with fundamentally different electrical specifications (40 V breakdown voltage, 3 A collector current, through-hole TO-126 package). Polarity reversal and reduced voltage rating make this part unsuitable for direct replacement in NPN 400 V applications.

Frequently Asked Questions (FAQ)

Q: Can MJD50G, MJD50TF, MJD50T4G, and NJVMJD50T4G be used interchangeably in the same circuit?

A: Yes. All four parts are electrically identical and mechanically compatible in the same PCB footprint. Selection between them depends on procurement format and assembly process requirements, not circuit performance.

Q: What is the difference between the packaging formats offered?

A: Tube packaging is used for manual assembly and small quantities. Tape & Reel (TR) and Cut Tape (CT) formats are designed for automated assembly equipment. Digi-Reel® is a proprietary packaging option. All formats contain identical components; packaging choice affects logistics and assembly efficiency only.

Q: Why is the MJD50 obsolete if substitutes are available?

A: The MJD50 has been superseded by improved versions (MJD50G, MJD50TF, MJD50T4G, NJVMJD50T4G) that maintain identical electrical performance while offering RoHS3 compliance and active product status. Obsolescence reflects manufacturing transition, not functional inadequacy.

Q: Can MJE170G replace MJD50 in my application?

A: No. MJE170G is a PNP transistor with 40 V maximum breakdown voltage and 3 A collector current, fundamentally different from the NPN MJD50 with 400 V breakdown voltage and 1 A collector current. Polarity and voltage rating incompatibility prevent substitution.

Q: Are there any temperature range differences between substitute parts?

A: MJD50TF specifies a maximum operating temperature of 150°C (TJ) without a minimum, while MJD50, MJD50G, MJD50T4G, and NJVMJD50T4G specify -65°C to 150°C. For applications requiring full temperature range operation, MJD50G, MJD50T4G, or NJVMJD50T4G are preferred.

Q: What is the inventory status of substitute parts?

A: MJD50T4G has the highest inventory (22,639 pcs), followed by NJVMJD50T4G (17,800 pcs), MJD50TF (6,080 pcs), and MJD50G (3,700 pcs). Original MJD50 stock is limited (1,315 pcs) due to obsolete status.

Q: Do all substitute parts have the same RoHS compliance status?

A: Yes. MJD50G, MJD50TF, MJD50T4G, and NJVMJD50T4G are all ROHS3 compliant. The original MJD50 is RoHS non-compliant, making substitution necessary for applications subject to RoHS regulations.

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