MJD340T4G Equivalent & Substitute Parts

Part Overview

The MJD340T4G is an NPN bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is housed in a Surface Mount DPAK package and delivers 15 W maximum power dissipation with a 10 MHz transition frequency. The part is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level.

Equivalent and substitute parts are identified when design requirements permit operation within specified electrical and mechanical parameter ranges. Substitution becomes necessary when the primary part reaches end-of-life status, inventory constraints occur, or alternative sourcing is required while maintaining circuit functionality within defined operating conditions.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	15	W
Frequency - Transition	10	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 50mA, 10V	—
Current - Collector Cutoff (Max)	100	µA
Operating Temperature	-65 to 150	°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of NPN bipolar junction transistors is determined by electrical parameter compatibility within the application circuit. The primary criteria for substitution are:

Voltage Rating Compatibility: The substitute part must equal or exceed the maximum collector-emitter breakdown voltage of 300 V to ensure safe operation under peak voltage conditions.

Current Rating Compatibility: The substitute part must equal or exceed the maximum collector current of 500 mA to handle the circuit's peak current demands without exceeding device ratings.

Power Dissipation Compatibility: The substitute part must equal or exceed the maximum power rating of 15 W to accommodate thermal load without exceeding junction temperature limits.

Frequency Response Compatibility: The substitute part must equal or exceed the transition frequency of 10 MHz to maintain circuit performance in switching or amplification applications.

DC Current Gain Compatibility: The substitute part must provide sufficient DC current gain (hFE) to ensure proper biasing and signal amplification within the application circuit.

Package Compatibility: The substitute part must use the TO-252-3 DPAK surface mount package to ensure mechanical and thermal compatibility with the printed circuit board layout.

Compliance Compatibility: The substitute part must maintain ROHS3 compliance and unlimited moisture sensitivity level to meet regulatory and manufacturing requirements.

Substitute parts are categorized as parametric equivalents when all electrical parameters meet or exceed the main part specifications, or as similar alternatives when specific parameters exceed requirements but remain within acceptable application ranges.

Parameter Comparison

Part Number	Manufacturer	Vce Breakdown (V)	Ic Max (mA)	Power Max (W)	Frequency (MHz)	hFE Min	Package	Product Status
MJD340T4G	onsemi	300	500	15	10	30	TO-252-3 DPAK	Active
MJD340RLG	onsemi	300	500	15	10	30	TO-252-3 DPAK	Active
MJD340T4	STMicroelectronics	300	500	15	—	30	TO-252-3 DPAK	Active
MJD340-13	Diodes Incorporated	300	500	15	—	30	TO-252-3 DPAK	Active
FJD5553TM	onsemi	400	3000	1.25	—	30	TO-252-3 DPAK	Active
FJD5555TM	onsemi	400	5000	1.34	—	20	TO-252-3 DPAK	Active
KSC5402DTF	onsemi	525	2000	30	11	6	TO-252-3 DPAK	Last Time Buy
KSC5502DTM	onsemi	600	2000	50	11	4	TO-252-3 DPAK	Active
BULD741T4	STMicroelectronics	400	2500	30	—	25	TO-252-3 DPAK	Active
ZXT1053AKTC	Diodes Incorporated	75	5000	4	140	300	TO-252-3 DPAK	Active
ZXT690BKTC	Diodes Incorporated	45	3000	3.9	—	150	TO-252-3 DPAK	Active

Engineering Selection Recommendations

Parametric Equivalent Selection

MJD340RLG (onsemi) is a parametric equivalent to MJD340T4G, offering identical electrical specifications across all rated parameters. Both devices are manufactured by onsemi, maintain Active product status, and provide ROHS3 compliance. Selection between these parts depends on packaging format availability: MJD340T4G is supplied in Cut Tape (CT) & Digi-Reel format, while MJD340RLG is supplied in Tape & Reel (TR) format.

Direct Manufacturer Alternatives

MJD340T4 (STMicroelectronics) and MJD340-13 (Diodes Incorporated) provide direct electrical equivalence to MJD340T4G with identical voltage, current, power, and gain specifications. Both alternatives maintain Active product status and ROHS3 compliance. These parts are suitable for applications where multi-source qualification is required or when STMicroelectronics or Diodes Incorporated supply chain preference exists.

Higher Voltage Rating Alternatives

KSC5402DTF (onsemi) and KSC5502DTM (onsemi) provide elevated voltage ratings of 525 V and 600 V respectively, with increased power dissipation capabilities of 30 W and 50 W. These parts are suitable for applications requiring higher voltage headroom. KSC5402DTF carries Last Time Buy status and should not be selected for new designs. KSC5502DTM maintains Active status and is appropriate for new applications requiring enhanced voltage performance.

Higher Current Rating Alternatives

FJD5553TM (onsemi) and FJD5555TM (onsemi) provide elevated current ratings of 3 A and 5 A respectively, with 400 V voltage ratings. These parts are suitable for applications requiring higher current handling capacity. Both maintain Active product status and ROHS3 compliance.

Incompatible Alternatives

ZXT1053AKTC and ZXT690BKTC are not suitable substitutes for MJD340T4G. ZXT1053AKTC provides only 75 V voltage rating, insufficient for 300 V applications. ZXT690BKTC provides only 45 V voltage rating, unsuitable for the specified 300 V operating environment. These parts are listed for reference only and should not be selected as replacements.

Frequently Asked Questions (FAQ)

Q: Can MJD340RLG replace MJD340T4G in existing designs?

A: Yes. MJD340RLG is a parametric equivalent with identical electrical specifications. The primary difference is packaging format: MJD340T4G uses Cut Tape & Digi-Reel format while MJD340RLG uses Tape & Reel format. Both are surface mount DPAK packages with identical pinout and thermal characteristics.

Q: What is the difference between MJD340T4G and MJD340T4?

A: Both parts provide identical electrical performance with 300 V voltage rating, 500 mA current rating, 15 W power dissipation, and 30 minimum hFE. The primary difference is manufacturer: MJD340T4G is manufactured by onsemi while MJD340T4 is manufactured by STMicroelectronics. Both maintain Active product status and ROHS3 compliance.

Q: Can KSC5402DTF be used as a substitute for MJD340T4G?

A: KSC5402DTF exceeds MJD340T4G specifications in voltage (525 V vs 300 V) and power (30 W vs 15 W), making it electrically compatible for applications within the 300 V operating range. However, KSC5402DTF carries Last Time Buy status and should not be selected for new designs. Use KSC5502DTM instead for enhanced voltage performance in new applications.

Q: Are ZXT1053AKTC and ZXT690BKTC suitable replacements?

A: No. ZXT1053AKTC provides only 75 V voltage rating and ZXT690BKTC provides only 45 V voltage rating. Both are insufficient for applications requiring 300 V operation. These parts are not compatible with MJD340T4G and should not be selected as substitutes.

Q: What packaging formats are available for MJD340T4G equivalents?

A: All equivalent and substitute parts use the TO-252-3 DPAK surface mount package with identical pinout and thermal characteristics. Packaging format differences exist only in tape and reel configurations: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), or Cut Tape (CT) only. These format differences do not affect electrical performance or circuit compatibility.

Q: Can higher current rated parts like FJD5555TM replace MJD340T4G?

A: FJD5555TM provides 5 A current rating compared to MJD340T4G's 500 mA rating, making it electrically compatible for applications operating below 500 mA. However, FJD5555TM provides only 1.34 W power dissipation compared to MJD340T4G's 15 W rating. Selection depends on specific application requirements for current handling and thermal performance.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), matching MJD340T4G compliance status. All parts carry EAR99 ECCN classification and REACH Unaffected status. Compliance certifications are consistent across all Active status parts.

Q: How do I determine which substitute part is appropriate for my application?

A: Identify the maximum voltage, current, and power requirements of your circuit. Select a substitute part with ratings equal to or exceeding these requirements. Verify the part maintains Active product status and ROHS3 compliance. Confirm the TO-252-3 DPAK package is compatible with your PCB layout. Consult the specific part datasheet for detailed electrical characteristics and thermal performance curves.

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