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

onsemi MJE15029

Name: MJE15029
Brand: onsemi
SKU: MJE15029
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE15029

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: MJE15029.pdf

Description:: TRANS PNP 120V 8A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:3,750

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Product details

Overview

MJE15029 from onsemi is a complementary PNP silicon power transistor in TO-220 package, rated for 120 V_CEO, 8 A continuous collector current, and 50 W total device dissipation at T_C = 25°C. It delivers high current gain–bandwidth product (f_T = 30 MHz) and is engineered for high-frequency driver stages in audio amplifier output circuits.

For engineers reviewing the MJE15029 datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, 120 V_CEO rating, TO-220 thermal performance (R_JC = 2.5°C/W), DC current gain linearity across 0.1–3 A, and safe operating area compliance up to 150°C junction temperature.

Technical Context

The MJE15029 operates as a linear PNP bipolar junction transistor with fixed emitter-base and collector-base junctions optimized for Class AB audio output stage biasing and signal amplification. Its f_T of 30 MHz enables stable operation into the upper audio band without phase inversion or gain collapse.

Thermal design relies on direct case-to-heatsink conduction via the TO-220 metal tab (pin 2 and 4 are collector-connected), with R_JA = 62.5°C/W limiting ambient-rated dissipation to 2.0 W unless actively cooled. Second breakdown limits define safe pulse operation under reactive loads per Figure 3.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	120 Vdc - Maximum collector-emitter voltage before avalanche under open-base conditions; defines rail voltage headroom in push-pull amplifier designs.
I_C (continuous)	8.0 Adc - Continuous collector current capability at T_C = 25°C; sets minimum heatsink sizing for sustained audio output power.
P_D @ T_C = 25°C	50 W - Total device dissipation limit when case temperature is maintained at 25°C; requires mechanical mounting to heatsink with thermal interface material.
f_T	30 MHz - Current gain–bandwidth product at I_C = 500 mAdc, V_CE = 10 Vdc; ensures flat small-signal response through 20 kHz with margin for stability compensation.
h_FE (min)	40 - Minimum DC current gain at I_C = 0.1 A, V_CE = 2.0 Vdc; supports predictable base drive requirements in driver transistor pairs.
R_JC	2.5°C/W - Junction-to-case thermal resistance; determines temperature rise from die to heatsink interface under steady-state power dissipation.
V_CE(sat)	0.5 Vdc max - Collector-emitter saturation voltage at I_C = 1.0 A, I_B = 0.1 A; defines conduction loss and thermal load in switching or quasi-saturated operation.

Pinout & Package

Package: TO-220-3 (Case 221A, Style 1), with metal tab electrically connected to collector (pins 2 and 4). Pin 1 is base, pin 3 is emitter.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased injection; requires current-limited drive to maintain h_FE linearity and avoid second breakdown.
2 & 4	Collector	High-current output node tied to metal tab; must be electrically isolated from heatsink unless circuit topology permits common-collector grounding.
3	Emitter	Reference terminal for output stage; connects to load or complementary NPN emitter in push-pull configuration.

Key Features

Feature	Design Value
High f_T (30 MHz)	Enables wideband audio driver operation without gain roll-off or phase shift-induced instability in feedback loops.
TO-220 thermal performance (R_JC = 2.5°C/W)	Supports compact heatsink integration in consumer and pro-audio amplifiers where board space and thermal mass are constrained.
Complementary pairing with MJE15028	Ensures matched V_CEO, h_FE, and SOA characteristics for symmetrical Class AB output stages with minimal crossover distortion.
Pb-free and RoHS-compliant packaging	Meets global environmental compliance requirements for industrial and commercial audio equipment without requalification.

Applications

Hi-Fi Audio Amplifier Output Stage	Professional Power Amplifier Driver
Use Scenario: Final push-pull output stage in discrete 50–100 W stereo amplifiers driving 4–8 Ω loudspeakers. IC Role / Device Role / Timing Role: PNP power transistor delivering negative half-cycle current while paired with MJE15028 (NPN) for positive half-cycle. Use Value: 120 V_CEO and 8 A I_C support ±40 V rails and dynamic peak currents >10 A into low-Z loads without SOA violation.	Use Scenario: Driver stage preceding MOSFET or bipolar output transistors in touring-grade 500+ W power amplifiers. IC Role / Device Role / Timing Role: High-fidelity current buffer amplifying pre-driver signals with minimal phase lag and harmonic distortion. Use Value: 30 MHz f_T preserves transient response integrity and damping factor control up to 20 kHz, critical for accurate low-frequency reproduction.
Studio Monitor Power Section	Active Crossover Amplifier
Use Scenario: Bi-amplified near-field studio monitors requiring clean, low-noise power delivery to tweeter and woofer sections. IC Role / Device Role / Timing Role: Discrete PNP switch/driver in active filter-coupled output paths with precise DC offset control. Use Value: Tight h_FE min/max spread (40–200) and low V_CE(sat) (<0.5 V) minimize thermal drift and inter-channel imbalance over temperature.	Use Scenario: High-slew-rate amplifier in analog active crossovers splitting full-range signals into band-limited channels for multi-driver systems. IC Role / Device Role / Timing Role: Linear gain block maintaining amplitude and phase coherence between frequency bands during real-time signal processing. Use Value: DC current gain linearity across 0.1–3 A ensures consistent transfer function regardless of program material dynamics or RMS level.

Hi-Fi Audio Amplifier Output Stage

Professional Power Amplifier Driver

Use Scenario: Final push-pull output stage in discrete 50–100 W stereo amplifiers driving 4–8 Ω loudspeakers.

IC Role / Device Role / Timing Role: PNP power transistor delivering negative half-cycle current while paired with MJE15028 (NPN) for positive half-cycle.

Use Value: 120 V_CEO and 8 A I_C support ±40 V rails and dynamic peak currents >10 A into low-Z loads without SOA violation.

Use Scenario: Driver stage preceding MOSFET or bipolar output transistors in touring-grade 500+ W power amplifiers.

IC Role / Device Role / Timing Role: High-fidelity current buffer amplifying pre-driver signals with minimal phase lag and harmonic distortion.

Use Value: 30 MHz f_T preserves transient response integrity and damping factor control up to 20 kHz, critical for accurate low-frequency reproduction.

Studio Monitor Power Section

Active Crossover Amplifier

Use Scenario: Bi-amplified near-field studio monitors requiring clean, low-noise power delivery to tweeter and woofer sections.

IC Role / Device Role / Timing Role: Discrete PNP switch/driver in active filter-coupled output paths with precise DC offset control.

Use Value: Tight h_FE min/max spread (40–200) and low V_CE(sat) (<0.5 V) minimize thermal drift and inter-channel imbalance over temperature.

Use Scenario: High-slew-rate amplifier in analog active crossovers splitting full-range signals into band-limited channels for multi-driver systems.

IC Role / Device Role / Timing Role: Linear gain block maintaining amplitude and phase coherence between frequency bands during real-time signal processing.

Use Value: DC current gain linearity across 0.1–3 A ensures consistent transfer function regardless of program material dynamics or RMS level.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15031G	Higher V_CEO (150 V) and same TO-220 package; otherwise identical electrical specs and pinout.	Suitable for higher-voltage rails (>±45 V) where increased breakdown margin is required without layout change.	Select MJE15031G only if system rail voltage exceeds 120 V_CEO derating limits; otherwise MJE15029 offers optimal cost/performance balance.
BD139	Lower V_CEO (80 V), lower I_C (1.5 A), TO-126 package, no Pb-free option in standard grade.	Limited to low-power audio preamps or non-critical switching; unsuitable for high-fidelity output stages above 20 W.	BD139 is not a functional replacement for MJE15029 in power amplifier roles due to SOA and thermal limitations.

Compared with MJE15031G, the MJE15029 trades 30 V breakdown margin for tighter parameter binning and lower cost in 120 V rail systems; compared with BD139, it provides 5.3× higher current capability, 1.5× higher voltage rating, and TO-220 thermal robustness essential for sustained audio power delivery.

Availability

MJE15029 is available at Aetrix Electronics and suitable for hi-fi audio amplifiers, professional power amplifier drivers, and studio monitor power sections requiring stable component supply and long-term manufacturing continuity.

Supply support for MJE15029 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 energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.

The MJE15029 belongs to onsemi's complementary silicon power transistor family designed specifically for high-fidelity audio amplifier output stages, emphasizing linearity, thermal reliability, and SOA robustness in linear operation.

FAQ

What is the maximum collector-emitter voltage rating for the MJE15029?

The MJE15029 has a maximum collector-emitter voltage rating (V_CEO) of 120 Vdc under open-base conditions. This rating defines the absolute upper limit for voltage swing across the transistor in linear amplifier configurations and must be derated at elevated case temperatures per the datasheet's thermal curves. Exceeding this value risks avalanche breakdown and permanent device failure.

Is the MJE15029 pin-compatible with the MJE15028?

Yes, the MJE15029 is complementary and pin-compatible with the MJE15028 in TO-220 package (Style 1), sharing identical pinout: pin 1 = base, pins 2 & 4 = collector, pin 3 = emitter. However, polarity differs-MJE15029 is PNP while MJE15028 is NPN-so they are used in mirrored positions within push-pull output stages, not as direct drop-in replacements.

What is the thermal resistance from junction to case for the MJE15029?

The MJE15029 has a maximum junction-to-case thermal resistance (R_JC) of 2.5°C/W, measured from the silicon die to the metal tab (collector terminals). This value assumes proper mounting with thermal interface material and direct contact to a heatsink; actual thermal performance depends on mounting pressure, surface flatness, and interface quality.

Does the MJE15029 support high-frequency audio applications?

Yes, the MJE15029 supports high-frequency audio applications with a current gain–bandwidth product (f_T) of 30 MHz at I_C = 500 mAdc and V_CE = 10 Vdc. This ensures stable small-signal gain and phase response well beyond 20 kHz, making it suitable for wideband driver stages in both consumer and professional audio amplifiers.

What is the DC current gain range for the MJE15029 at different operating points?

The MJE15029 exhibits a minimum DC current gain (h_FE) of 40 at I_C = 0.1 A and V_CE = 2.0 Vdc, dropping to 20 at I_C = 4.0 A under the same conditions. Its h_FE linearity is specified as typical 2–3 across I_C = 0.1–3.0 A, enabling predictable base drive design in Class AB output stages without gain compression artifacts.

MJE15029 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 120 V

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

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 4A, 2V

Power - Max:: 50 W

Frequency - Transition:: 30MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

MJE15029 FAQ

1.How can I place an order for MJE15029 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE15029 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 MJE15029 reliable?

The price and inventory of MJE15029 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE15029 is usually 5 days.

3.What payment methods are accepted for MJE15029?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE15029 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE15029?

MJE15029 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE15029 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 MJE15029?

For technical support, including MJE15029 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE15029 requirements.

6.How does Aetrix verify that MJE15029 is sourced from the original manufacturer or authorized distributors?

All MJE15029 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 MJE15029 meets industry standards.

7.What is the process for return or replacement of MJE15029?

All MJE15029 units undergo pre-shipment inspection (PSI). If there is an issue with MJE15029, 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 MJE15029 part is unused and in its original packaging.

Return procedure for MJE15029:

1.Submit a request within 90 days.

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

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