MJD243T4G Equivalent & Substitute Parts

Part Overview

The MJD243T4G is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This Surface Mount device in DPAK packaging delivers 4 A collector current at 100 V breakdown voltage with 1.4 W maximum power dissipation. The part is currently in Active product status with 20,030 units in stock. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	MJD243T4G	—
Manufacturer	onsemi	—
Transistor Type	NPN	—
Current - Collector (Ic) Max	4	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max)	600 mV @ 100 mA, 1 A	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min	40 @ 200 mA, 1 V	—
Power - Max	1.4	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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution eligibility for the MJD243T4G is determined by strict equivalence across the following critical parameters:

Parametric Equivalence Criteria:

Transistor Type: NPN
Current - Collector (Ic) Max: 4 A
Voltage - Collector Emitter Breakdown (Max): 100 V
Vce Saturation (Max): 600 mV @ 100 mA, 1 A
Current - Collector Cutoff (Max): 100 nA
DC Current Gain (hFE) Min: 40 @ 200 mA, 1 V
Power - Max: 1.4 W
Frequency - Transition: 40 MHz
Operating Temperature Range: -65°C to 150°C (TJ)
Mounting Type: Surface Mount
Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63

Substitute Categories:

Parametric Equivalent: NJVMJD243T4G differs only in packaging format (Tape & Reel vs. Cut Tape) and inventory source. All electrical and mechanical specifications are identical.

Similar Part (Limited Substitution): MJD31CT4 shares the same package and voltage rating but differs in collector current (3 A vs. 4 A), power dissipation (15 W vs. 1.4 W), transition frequency (3 MHz vs. 40 MHz), and product status (Obsolete). This part is not a direct substitute.

Parameter Comparison

Parameter	MJD243T4G	NJVMJD243T4G	MJD31CT4
Manufacturer	onsemi	onsemi	onsemi
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)	600 mV @ 100 mA, 1 A	600 mV @ 100 mA, 1 A	1.2 V @ 375 mA, 3 A
Current - Collector Cutoff (Max)	100 nA	100 nA	50 µA
DC Current Gain (hFE) Min	40 @ 200 mA, 1 V	40 @ 200 mA, 1 V	10 @ 3 A, 4 V
Power - Max	1.4 W	1.4 W	15 W
Frequency - Transition	40 MHz	40 MHz	3 MHz
Operating Temperature Range	-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
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Product Status	Active	Active	Obsolete
Inventory	20,030 Pcs	39,200 Pcs	17,029 Pcs

Engineering Selection Recommendations

Direct Substitution (Parametric Equivalent):

NJVMJD243T4G is a direct parametric equivalent to MJD243T4G. Both parts are manufactured by onsemi, share identical electrical specifications, and are housed in the same DPAK package. The only distinction is the packaging format: MJD243T4G is supplied in Cut Tape with Digi-Reel, while NJVMJD243T4G is supplied in Tape & Reel format. Both parts maintain Active product status and ROHS3 compliance. Selection between these two depends on assembly line requirements and packaging preferences.

Limited Substitution (Similar Part):

MJD31CT4 is not recommended as a direct substitute. Although it shares the same DPAK package and 100 V voltage rating, it differs significantly in collector current (3 A vs. 4 A), power dissipation (15 W vs. 1.4 W), transition frequency (3 MHz vs. 40 MHz), and DC current gain characteristics. Additionally, MJD31CT4 is marked as Obsolete and is not RoHS3 compliant. Use of this part is restricted to legacy applications where the lower current and frequency specifications are acceptable and RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can NJVMJD243T4G replace MJD243T4G in production?

A: Yes. NJVMJD243T4G is a parametric equivalent with identical electrical and mechanical specifications. The difference is packaging format only. If your assembly process accommodates Tape & Reel packaging, NJVMJD243T4G is a direct replacement.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) is supplied on individual tape segments suitable for manual or small-batch assembly. Tape & Reel (TR) is supplied on continuous reels optimized for high-volume automated pick-and-place assembly. Both formats contain the same component in the same DPAK package.

Q: Can MJD31CT4 be used instead of MJD243T4G?

A: No. MJD31CT4 has different electrical specifications: 3 A maximum collector current (vs. 4 A), 15 W power dissipation (vs. 1.4 W), and 3 MHz transition frequency (vs. 40 MHz). These differences make it unsuitable for applications designed for MJD243T4G. Additionally, MJD31CT4 is Obsolete and not RoHS3 compliant.

Q: Are both MJD243T4G and NJVMJD243T4G RoHS compliant?

A: Yes. Both parts are ROHS3 compliant and suitable for applications requiring RoHS certification.

Q: What is the moisture sensitivity level for these parts?

A: All three parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Which part should I select for new designs?

A: For new designs, select either MJD243T4G or NJVMJD243T4G based on your assembly packaging requirements. Both are Active products with full availability. Avoid MJD31CT4 for new designs due to its Obsolete status and different electrical specifications.

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