MJD243 Equivalent & Substitute Parts

Part Overview

The MJD243 is an NPN bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 4 A maximum collector current. The device is housed in a Surface Mount DPAK package (TO-252-3) and operates across a temperature range of -65°C to 150°C. The MJD243 is classified as obsolete, necessitating identification of equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	4	A
Power - Max	1.4	W
Frequency - Transition	40	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 200mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 100mA, 1A	—
Operating Temperature Range	-65 to 150	°C
Package / Case	TO-252-3, DPAK	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the MJD243 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criterion is maintenance of the following parameters:

Transistor type: NPN configuration
Voltage rating: 100 V collector-emitter breakdown minimum
Current rating: 4 A collector current minimum
Package: TO-252-3 DPAK Surface Mount
Temperature range: -65°C to 150°C operating capability

Direct Equivalent Classification: Parts meeting all electrical and mechanical parameters without deviation.

Similar Classification: Parts with reduced electrical performance in specific parameters (current, power, or frequency) but maintaining voltage and package compatibility. These parts are suitable only for applications where the reduced specifications do not impact circuit function.

Parameter Comparison

Parameter	MJD243	MJD243G	MJD31CT4
Manufacturer	onsemi	onsemi	onsemi
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V
Current - Collector (Ic) (Max)	4 A	4 A	3 A
Power - Max	1.4 W	1.4 W	15 W
Frequency - Transition	40 MHz	40 MHz	3 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 200mA, 1V	40 @ 200mA, 1V	10 @ 3A, 4V
Vce Saturation (Max) @ Ib, Ic	600mV @ 100mA, 1A	600mV @ 100mA, 1A	1.2V @ 375mA, 3A
Operating Temperature Range	-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
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

MJD243G (Direct Equivalent - Recommended Primary Substitute)

The MJD243G is the direct electrical and mechanical equivalent of the MJD243. All electrical parameters, including collector current (4 A), voltage rating (100 V), power dissipation (1.4 W), transition frequency (40 MHz), and DC current gain specifications, are identical. The MJD243G is classified as Active product status, ensuring ongoing availability and supply chain continuity. The MJD243G carries ROHS3 compliance certification, meeting current regulatory requirements for new designs and production. The MJD243G is supplied in Tube packaging, suitable for automated assembly processes. This part is the direct replacement for the obsolete MJD243.

MJD31CT4 (Similar Classification - Application-Dependent Substitution)

The MJD31CT4 shares the same 100 V voltage rating and TO-252-3 DPAK package configuration as the MJD243. However, the MJD31CT4 exhibits reduced maximum collector current (3 A versus 4 A), lower transition frequency (3 MHz versus 40 MHz), and significantly higher power dissipation capability (15 W versus 1.4 W). The DC current gain is substantially lower (10 @ 3A, 4V versus 40 @ 200mA, 1V), and saturation voltage is elevated (1.2 V versus 600 mV). The MJD31CT4 is classified as Obsolete. Substitution with MJD31CT4 is limited to applications where collector current does not exceed 3 A and where the reduced transition frequency and altered gain characteristics do not compromise circuit performance. This part is not recommended as a primary substitute due to electrical parameter deviations and obsolete status.

Frequently Asked Questions (FAQ)

Q: Can MJD243G be used as a direct replacement for MJD243 in all applications?

A: Yes. The MJD243G maintains identical electrical specifications across all rated parameters: 4 A collector current, 100 V breakdown voltage, 1.4 W power dissipation, 40 MHz transition frequency, and DC current gain of 40 @ 200mA, 1V. The TO-252-3 DPAK package is mechanically identical. The MJD243G is the direct equivalent and primary substitute for the obsolete MJD243.

Q: What is the primary advantage of MJD243G over the original MJD243?

A: The MJD243G is classified as Active product status, ensuring continued availability and supply chain support. The MJD243G carries ROHS3 compliance certification, meeting current environmental and regulatory standards for new product designs and manufacturing. The original MJD243 is obsolete and RoHS non-compliant.

Q: Is MJD31CT4 a suitable substitute for MJD243?

A: MJD31CT4 is not recommended as a primary substitute. While both devices share the same 100 V voltage rating and DPAK package, the MJD31CT4 has reduced maximum collector current (3 A versus 4 A), significantly lower transition frequency (3 MHz versus 40 MHz), and substantially different DC current gain characteristics (10 @ 3A, 4V versus 40 @ 200mA, 1V). Substitution is limited to applications where these electrical deviations do not impact circuit function and where collector current remains below 3 A.

Q: Are there packaging differences between MJD243 and MJD243G?

A: Both MJD243 and MJD243G use the TO-252-3 DPAK Surface Mount package. The primary packaging difference is that MJD243G is supplied in Tube packaging, which is standard for automated assembly processes. This packaging format does not affect electrical performance or mechanical compatibility.

Q: What compliance certifications should be considered when selecting a substitute?

A: The MJD243G carries ROHS3 compliance certification, meeting current environmental regulations for new designs. The original MJD243 and MJD31CT4 are RoHS non-compliant. For applications subject to RoHS requirements, MJD243G is the appropriate selection. All three parts are REACH Unaffected and carry EAR99 ECCN classification.

Q: Can MJD243 be used in new product designs?

A: No. The MJD243 is classified as Obsolete and RoHS non-compliant. New product designs must utilize MJD243G, which is Active status and ROHS3 compliant. Using obsolete components in new designs creates supply chain risk and regulatory compliance issues.

Q: What is the operating temperature range for all substitute parts?

A: All three parts (MJD243, MJD243G, and MJD31CT4) operate across the identical temperature range of -65°C to 150°C junction temperature (TJ). Temperature performance is not a differentiating factor in substitution decisions.

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