MJE15034 Equivalent & Substitute Parts

Part Overview

The MJE15034 is an NPN bipolar junction transistor manufactured by onsemi, rated for 350 V collector-emitter breakdown voltage and 4 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The MJE15034 is suitable for general-purpose switching and amplification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	350 V
Current - Collector (Ic) (Max)	4 A
Power - Max	2 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	10 @ 2A, 5V
Frequency - Transition	30MHz
Operating Temperature	-65°C ~ 150°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the MJE15034 are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalent (Identical Electrical Specifications): Parts that maintain all critical electrical parameters including collector-emitter breakdown voltage (350 V), maximum collector current (4 A), power dissipation (2 W), and saturation voltage characteristics. These parts are pin-compatible and require no circuit modifications.

Similar Substitutes (Enhanced or Comparable Ratings): Parts that exceed one or more electrical parameters while maintaining the same TO-220-3 package and through-hole mounting configuration. These substitutes provide equal or superior performance in voltage rating, current capacity, or power dissipation. Substitution is valid when the application circuit does not depend on the lower specifications of the original part.

The following parameters determine substitution validity:

Transistor Type: NPN (mandatory match)
Package / Case: TO-220-3 (mandatory match)
Mounting Type: Through Hole (mandatory match)
Voltage - Collector Emitter Breakdown (Max): Equal or greater than 350 V
Current - Collector (Ic) (Max): Equal or greater than 4 A
Power - Max: Equal or greater than 2 W

Parameter Comparison

Part Number	Manufacturer	Vce Breakdown (V)	Ic Max (A)	Power Max (W)	Vce Sat (Max)	hFE Min @ Ic, Vce	Package	Product Status
MJE15034	onsemi	350	4	2	500mV @ 100mA, 1A	10 @ 2A, 5V	TO-220-3	Obsolete
MJE15034G	onsemi	350	4	2	500mV @ 100mA, 1A	10 @ 2A, 5V	TO-220-3	Active
BUL38D	STMicroelectronics	450	5	80	1.1V @ 750mA, 3A	10 @ 10mA, 5V	TO-220-3	Active
BUL49D	STMicroelectronics	450	5	80	1.2V @ 800mA, 4A	4 @ 7A, 10V	TO-220-3	Active
BUL742C	STMicroelectronics	400	4	70	1.5V @ 1A, 3.5A	25 @ 800mA, 3V	TO-220-3	Active
ST13005	STMicroelectronics	400	4	75	1V @ 1A, 4A	8 @ 2A, 5V	TO-220-3	Active
TSC742CZ C0G	Taiwan Semiconductor Corporation	420	5	70	1.5V @ 1A, 3.5A	48 @ 100mA, 5V	TO-220-3	Active

Engineering Selection Recommendations

MJE15034G (onsemi): This part is the direct equivalent replacement for the MJE15034. It maintains identical electrical specifications and is manufactured by the same supplier. MJE15034G is classified as Active product status and is RoHS3 compliant, making it the preferred choice for new designs and production continuity. This part is available in tube packaging and provides the most straightforward substitution path with zero circuit modifications required.

BUL742C (STMicroelectronics): This substitute provides equivalent collector current (4 A) and slightly elevated voltage rating (400 V vs. 350 V). Power dissipation is significantly enhanced (70 W vs. 2 W), providing superior thermal performance. BUL742C is RoHS3 compliant and Active product status. This part is suitable for applications where the original 2 W power rating is marginal or where enhanced thermal headroom is beneficial.

ST13005 (STMicroelectronics): This substitute matches the collector current rating (4 A) and provides elevated voltage rating (400 V vs. 350 V) with enhanced power dissipation (75 W vs. 2 W). ST13005 is RoHS3 compliant and Active product status. This part is applicable in designs requiring improved thermal performance or where circuit margins are critical.

BUL38D and BUL49D (STMicroelectronics): These substitutes provide enhanced current capacity (5 A vs. 4 A) and voltage rating (450 V vs. 350 V) with significantly higher power dissipation (80 W vs. 2 W). Both are RoHS3 compliant and Active product status. These parts are suitable for applications requiring higher current handling or where design margins must accommodate future performance upgrades.

TSC742CZ C0G (Taiwan Semiconductor Corporation): This substitute provides enhanced current capacity (5 A vs. 4 A) and voltage rating (420 V vs. 350 V) with power dissipation of 70 W. TSC742CZ C0G is RoHS3 compliant and Active product status. This part is applicable where current capacity must exceed the original specification.

Frequently Asked Questions (FAQ)

Q: Can MJE15034G be used as a direct replacement for MJE15034?

A: Yes. MJE15034G is the direct equivalent with identical electrical specifications, package configuration, and pin assignment. No circuit modifications are required. MJE15034G is the recommended replacement due to its Active product status and RoHS3 compliance.

Q: What is the primary difference between MJE15034 and MJE15034G?

A: The primary difference is product status and packaging. MJE15034 is classified as Obsolete, while MJE15034G is Active. MJE15034G is supplied in tube packaging and is RoHS3 compliant. Electrical specifications are identical.

Q: Can BUL742C or ST13005 be used in place of MJE15034?

A: Yes, with circuit verification. Both parts maintain the 4 A collector current rating and provide enhanced voltage rating (400 V vs. 350 V) and power dissipation (70-75 W vs. 2 W). These substitutes are suitable when the application does not depend on the lower power rating of the original part. Circuit simulation or testing is recommended to confirm performance in the specific application.

Q: What is the advantage of using BUL38D or BUL49D over MJE15034?

A: BUL38D and BUL49D provide enhanced current capacity (5 A vs. 4 A), higher voltage rating (450 V vs. 350 V), and significantly greater power dissipation (80 W vs. 2 W). These parts are suitable for applications requiring higher current handling or where thermal performance is critical. Pin configuration remains compatible with TO-220-3 mounting.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (MJE15034G, BUL38D, BUL49D, BUL742C, ST13005, and TSC742CZ C0G) are RoHS3 compliant. The original MJE15034 is RoHS non-compliant.

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

A: All substitute parts operate within the temperature range of -65°C to 150°C (TJ), matching the original MJE15034 specification.

Q: Are all substitute parts available in TO-220-3 package?

A: Yes. All substitute parts are packaged in TO-220-3 configuration with through-hole mounting, ensuring mechanical compatibility with the original MJE15034 footprint.

Q: Which substitute part provides the closest electrical match to MJE15034?

A: MJE15034G provides the closest electrical match with identical specifications across all parameters. This part is the recommended direct replacement.

Q: Can TSC742CZ C0G be used in high-reliability applications?

A: TSC742CZ C0G is RoHS3 compliant and Active product status. However, it carries Moisture Sensitivity Level (MSL) 3 (168 Hours), compared to MSL 1 (Unlimited) for onsemi and most STMicroelectronics alternatives. Applications with stringent moisture sensitivity requirements should consider parts with lower MSL ratings.

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