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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi MJE15034

Name: MJE15034
Brand: onsemi
SKU: MJE15034
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE15034

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: MJE15034.pdf

Description:: TRANS NPN 350V 4A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJE15034 from onsemi is an NPN silicon power transistor in a TO−220 package, rated for 350 V_CEO, 4.0 A continuous collector current, and 50 W power dissipation at T_C = 25°C. It delivers f_T = 30 MHz bandwidth and h_FE ≥ 100 at I_C = 0.1 A, designed specifically as a high-frequency driver stage in audio amplifier output circuits.

For engineers reviewing the MJE15034 datasheet, pinout, applications, or equivalent options, key selection criteria include its 350 V breakdown rating, TO−220 thermal performance (R_JC = 2.5°C/W), DC current gain vs. load current profile, safe operating area under pulsed conditions, and Pb-free RoHS-compliant packaging.

Technical Context

The MJE15034 operates as a linear-mode NPN bipolar junction transistor with complementary pairing to the PNP MJE15035. Its design emphasizes high-voltage capability (V_CEO = V_CB = 350 V) and stable gain-bandwidth performance (f_T = 30 MHz at I_C = 500 mA, V_CE = 10 V) across −65°C to +150°C junction temperature range.

Thermal management is defined by R_JC = 2.5°C/W and R_JA = 62.5°C/W, supporting operation in forced-air or heatsink-mounted audio power stages. The device exhibits V_CE(sat) ≤ 0.5 V at I_C = 1.0 A / I_B = 0.1 A and V_BE(on) ≤ 1.0 V under same conditions, enabling efficient Class AB driver operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	350 Vdc - Supports rail voltages up to ±175 V in push-pull audio output stages without breakdown.
I_C (continuous)	4.0 Adc - Enables 50–100 W audio amplifier output drive before thermal derating applies.
P_D @ T_C = 25°C	50 W - Requires mechanical mounting to heatsink; derates 0.40 W/°C above 25°C case temperature.
f_T	30 MHz - Ensures adequate gain margin and phase stability in wideband audio driver feedback loops.
h_FE min	100 @ I_C = 0.1 A - Provides predictable base drive requirements for low-distortion Class AB bias networks.
R_JC	2.5°C/W - Enables direct thermal path from die to heatsink, critical for sustained high-power audio operation.

Pinout & Package

Package: TO−220−3 (Case 221A, Style 1), 10.10 × 15.12 × 4.45 mm, 2.54 mm pin pitch, Pb-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring current-driven bias; typical I_B ≤ 1.0 Adc max per datasheet absolute rating.
2	Collector	Main high-voltage, high-current output terminal; electrically connected to tab and pin 4.
3	Emiter	Low-impedance return path; used for emitter degeneration or current sensing in amplifier designs.
4	Collector	Second collector connection - internally tied to pin 2; provides redundant thermal and current path to heatsink tab.

Key Features

Feature	Design Value
High-voltage rating	V_CEO = V_CB = 350 V enables use in ±150 V rail audio amplifiers without snubbing or derating.
TO−220 thermal performance	R_JC = 2.5°C/W allows >40 W continuous dissipation with modest heatsinking (e.g., 10°C/W sink).
Gain-bandwidth product	f_T = 30 MHz ensures stable closed-loop response in multi-stage audio drivers up to 20 kHz.
Pb-free & RoHS compliance	Meets global environmental regulations; UL 94 V−0 epoxy housing supports safety-critical audio equipment.

Applications

High-Fidelity Audio Amplifiers	Professional Audio Power Stages
Use Scenario: Final output driver in discrete Class AB or Class G audio amplifiers delivering 50–150 W into 4–8 Ω loads. IC Role / Device Role / Timing Role: NPN power switching element in complementary push-pull pair, handling high-voltage swing and peak current transients. Use Value: 350 V rating avoids clipping at ±120 V rails; 4.0 A I_C supports 100 W peaks; f_T = 30 MHz preserves transient fidelity.	Use Scenario: Driver stage in touring-grade powered loudspeakers requiring rugged, thermally stable output devices. IC Role / Device Role / Timing Role: High-current, high-voltage linear amplifier transistor mounted directly to extruded aluminum heatsink. Use Value: R_JC = 2.5°C/W enables reliable operation at 60 W continuous; TO−220 mechanical robustness withstands vibration and thermal cycling.
Industrial Motor Drive Pre-Driver	Test Equipment Power Output
Use Scenario: Medium-power gate/base driver for IGBTs or MOSFETs in servo amplifier front-end stages. IC Role / Device Role / Timing Role: Linear current amplifier translating low-level control signals into high-current base/gate drive pulses. Use Value: h_FE ≥ 100 at 0.1 A ensures precise current mirroring; V_CEO = 350 V accommodates flyback energy in inductive loads.	Use Scenario: Programmable DC power supply output stage delivering 0–100 V / 0–3 A with analog regulation. IC Role / Device Role / Timing Role: Series pass transistor operating in linear mode with active thermal foldback protection. Use Value: 50 W P_D at T_C = 25°C supports 30 W continuous output; ESD-rated (HBM 3B) improves reliability during bench handling.

High-Fidelity Audio Amplifiers

Professional Audio Power Stages

Use Scenario: Final output driver in discrete Class AB or Class G audio amplifiers delivering 50–150 W into 4–8 Ω loads.

IC Role / Device Role / Timing Role: NPN power switching element in complementary push-pull pair, handling high-voltage swing and peak current transients.

Use Value: 350 V rating avoids clipping at ±120 V rails; 4.0 A I_C supports 100 W peaks; f_T = 30 MHz preserves transient fidelity.

Use Scenario: Driver stage in touring-grade powered loudspeakers requiring rugged, thermally stable output devices.

IC Role / Device Role / Timing Role: High-current, high-voltage linear amplifier transistor mounted directly to extruded aluminum heatsink.

Use Value: R_JC = 2.5°C/W enables reliable operation at 60 W continuous; TO−220 mechanical robustness withstands vibration and thermal cycling.

Industrial Motor Drive Pre-Driver

Test Equipment Power Output

Use Scenario: Medium-power gate/base driver for IGBTs or MOSFETs in servo amplifier front-end stages.

IC Role / Device Role / Timing Role: Linear current amplifier translating low-level control signals into high-current base/gate drive pulses.

Use Value: h_FE ≥ 100 at 0.1 A ensures precise current mirroring; V_CEO = 350 V accommodates flyback energy in inductive loads.

Use Scenario: Programmable DC power supply output stage delivering 0–100 V / 0–3 A with analog regulation.

IC Role / Device Role / Timing Role: Series pass transistor operating in linear mode with active thermal foldback protection.

Use Value: 50 W P_D at T_C = 25°C supports 30 W continuous output; ESD-rated (HBM 3B) improves reliability during bench handling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-voltage power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15032	Lower V_CEO = 250 V; identical TO−220 package and pinout; f_T = 25 MHz.	Suitable only for ≤ ±125 V rail systems; reduced SOA at high voltage.	Select when cost sensitivity outweighs 350 V headroom requirement and thermal margin is sufficient.
BDW83C	V_CEO = 100 V; higher I_C = 12 A; different pinout (Emitter−Base−Collector); R_JC = 1.5°C/W.	Optimized for lower-voltage, higher-current motor drives-not drop-in for audio rail applications.	Choose only if redesigning layout for lower-voltage, higher-current operation and improved thermal resistance is prioritized.

Compared with MJE15034, MJE15032 offers cost savings but sacrifices 100 V of voltage headroom critical for high-rail audio, while BDW83C trades voltage capability for current capacity and requires PCB rework due to non-compatible pinout and lower V_CEO.

Availability

MJE15034 is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, professional audio power stages, and industrial motor drive pre-driver circuits requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MJE15034 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in power management, analog, sensor, and discrete components for automotive, industrial, and consumer markets.

The MJE15034 belongs to onsemi's complementary silicon plastic power transistor family, engineered for high-frequency linearity and rugged thermal performance in audio and industrial linear amplifier applications.

FAQ

What is the maximum safe collector-emitter voltage for MJE15034?

The MJE15034 has a guaranteed minimum V_CEO(sus) of 350 Vdc under test condition I_C = 10 mA, I_B = 0. Exceeding this voltage risks avalanche breakdown and permanent damage. Derating is recommended for reliability in repetitive pulse or high-temperature operation; consult Figure 2 (SOA) for time-limited surge limits.

Does MJE15034 require a heatsink in normal operation?

Yes - the MJE15034 must be mounted to a heatsink in all continuous-power applications. At T_A = 25°C, its ambient-rated P_D is only 2.0 W; full 50 W dissipation is only achievable at T_C = 25°C via direct case-to-heatsink conduction. R_JA = 62.5°C/W confirms mandatory heatsinking for >1 W operation.

Is MJE15034 pin-compatible with MJE15035?

No - MJE15034 (NPN) and MJE15035 (PNP) share identical TO−220−3 package dimensions and pin numbering (Style 1), but their internal polarity and electrical behavior differ. They are complementary devices intended for push-pull pairing, not interchangeable replacements. Swapping them will cause circuit failure.

What is the typical DC current gain of MJE15034 at 2 A collector current?

Per the datasheet's Figure 4 and Electrical Characteristics table, h_FE is specified as min 50 at I_C = 1.0 A, V_CE = 5.0 V, and drops to approximately 10 at I_C = 2.0 A under same conditions. This steep gain roll-off informs base drive design - e.g., ≥200 mA I_B needed for 2 A I_C saturation.

Can MJE15034 be used in switching power supplies?

The MJE15034 is optimized for linear-mode audio amplification, not hard-switching SMPS. Its relatively slow storage time (not specified in datasheet) and lack of optimized switching parameters (e.g., t_on/t_off, Q_g) make it unsuitable for >20 kHz PWM. Use dedicated switching transistors like MJD122 or modern MOSFETs instead.

MJE15034 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 350 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 10 @ 2A, 5V

Power - Max:: 2 W

Frequency - Transition:: 30MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

MJE15034 FAQ

1.How can I place an order for MJE15034 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE15034 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MJE15034 reliable?

The price and inventory of MJE15034 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE15034 is usually 5 days.

3.What payment methods are accepted for MJE15034?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE15034 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE15034?

MJE15034 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE15034 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MJE15034?

For technical support, including MJE15034 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE15034 requirements.

6.How does Aetrix verify that MJE15034 is sourced from the original manufacturer or authorized distributors?

All MJE15034 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MJE15034 meets industry standards.

7.What is the process for return or replacement of MJE15034?

All MJE15034 units undergo pre-shipment inspection (PSI). If there is an issue with MJE15034, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MJE15034 part is unused and in its original packaging.

Return procedure for MJE15034:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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