MJD243T4 Equivalent & Substitute Parts

Part Overview

The MJD243T4 is an obsolete NPN power bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 4 A maximum collector current in a surface mount DPAK package. The device is classified as RoHS non-compliant and carries an obsolete product status. Due to its obsolete classification, equivalent and substitute parts are necessary for ongoing design support, production continuity, and compliance with current regulatory standards.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	4	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Power - Max	12.5	W
Frequency - Transition	40	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MJD243T4 is determined by strict equivalence in the following electrical and mechanical parameters:

Transistor Type: NPN configuration required
Voltage Rating: 100 V collector-emitter breakdown voltage (VCEO)
Current Rating: Minimum 4 A maximum collector current (Ic)
Package: DPAK surface mount form factor (TO-252-3, SC-63)
Operating Temperature: -65°C to 150°C junction temperature range
Frequency Performance: 40 MHz transition frequency or higher

Substitute parts must maintain compatibility across these core parameters to ensure functional equivalence in circuit applications. Parts that deviate from these specifications are classified as partial substitutes with application-dependent limitations.

Parameter Comparison

Parameter	MJD243T4	MJD243T4G	MJD31CT4
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	4 A	4 A	3 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V
Vce Saturation (Max)	300 mV @ 50 mA, 500 mA	600 mV @ 100 mA, 1 A	1.2 V @ 375 mA, 3 A
DC Current Gain (hFE) (Min)	40 @ 200 mA, 1 V	40 @ 200 mA, 1 V	10 @ 3 A, 4 V
Power - Max	12.5 W	1.4 W	15 W
Frequency - Transition	40 MHz	40 MHz	3 MHz
Operating Temperature	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)	-65 to 150 °C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Product Status	Obsolete	Active	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

MJD243T4G is the primary direct substitute for MJD243T4. Both devices maintain identical electrical specifications for collector current (4 A), collector-emitter breakdown voltage (100 V), DC current gain (40 @ 200 mA, 1 V), and transition frequency (40 MHz). MJD243T4G carries Active product status and ROHS3 compliance, providing regulatory advantage over the obsolete MJD243T4. The packaging and mounting type are identical (DPAK surface mount). MJD243T4G is suitable for direct replacement in applications where the original MJD243T4 was specified.

MJD31CT4 is a partial substitute with application-dependent limitations. While it maintains the 100 V voltage rating and DPAK package compatibility, the maximum collector current is reduced to 3 A (versus 4 A for MJD243T4), and the transition frequency is significantly lower at 3 MHz (versus 40 MHz). MJD31CT4 is suitable only for applications where the 3 A current rating and 3 MHz frequency performance are acceptable. This device is also classified as obsolete and RoHS non-compliant.

For new designs and production requiring regulatory compliance, MJD243T4G is the recommended selection. For legacy system maintenance where the original 4 A / 40 MHz performance envelope is required, MJD243T4G provides the only active, compliant alternative.

Frequently Asked Questions (FAQ)

Q: Can MJD243T4G be used as a direct replacement for MJD243T4?

A: Yes. MJD243T4G maintains identical electrical specifications across all critical parameters: 4 A collector current, 100 V breakdown voltage, 40 MHz transition frequency, and 40 minimum DC current gain. The DPAK surface mount package is identical. MJD243T4G is the direct equivalent.

Q: What is the primary difference between MJD243T4 and MJD243T4G?

A: The primary differences are product status and regulatory compliance. MJD243T4G is Active and ROHS3 compliant, while MJD243T4 is Obsolete and RoHS non-compliant. Electrical performance is equivalent.

Q: Can MJD31CT4 replace MJD243T4 in all applications?

A: No. MJD31CT4 has a reduced maximum collector current of 3 A (versus 4 A) and a significantly lower transition frequency of 3 MHz (versus 40 MHz). MJD31CT4 is suitable only for applications where these reduced specifications are acceptable.

Q: Are all substitute parts available in the same DPAK package?

A: Yes. MJD243T4, MJD243T4G, and MJD31CT4 are all supplied in the TO-252-3 DPAK (2 Leads + Tab) surface mount package, ensuring mechanical compatibility.

Q: What is the operating temperature range for these devices?

A: All three devices operate across the identical temperature range of -65°C to 150°C junction temperature (TJ).

Q: Which substitute part should be selected for new designs?

A: MJD243T4G is the recommended selection for new designs. It provides Active product status, ROHS3 compliance, and identical electrical performance to the original MJD243T4.

Q: Are there any saturation voltage differences between the substitute parts?

A: Yes. MJD243T4 exhibits 300 mV saturation voltage at 50 mA / 500 mA, MJD243T4G exhibits 600 mV at 100 mA / 1 A, and MJD31CT4 exhibits 1.2 V at 375 mA / 3 A. Applications sensitive to saturation voltage performance must account for these differences.

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