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

onsemi MJE15028

Name: MJE15028
Brand: onsemi
SKU: MJE15028
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE15028

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: MJE15028.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJE15028 from onsemi is an NPN silicon power transistor in a 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 30 MHz current gain–bandwidth product (f_T) and is engineered for high-frequency driver stages in audio amplifier output circuits.

For engineers reviewing the MJE15028 datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO = 120 V, I_C = 8 A, f_T = 30 MHz, R_JC = 2.5 °C/W, and TO-220 case 221A mechanical outline with verified pin configuration.

Technical Context

The MJE15028 operates as a linear NPN bipolar junction transistor optimized for Class AB audio output stage drivers. Its DC current gain (h_FE) maintains ≥40 at I_C = 0.1 A and ≥20 at I_C = 4.0 A under V_CE = 2.0 V, supporting stable biasing across signal swing. The device exhibits low V_CE(sat) ≤ 0.5 V at I_C = 1.0 A / I_B = 0.1 A and V_BE(on) ≤ 1.0 V at same conditions.

Thermal design is enabled by R_JC = 2.5 °C/W and R_JA = 62.5 °C/W, with safe operating area (SOA) defined up to second breakdown limits at T_C = 25°C. Transient thermal response supports pulsed operation with duty cycles ≤10% and peak junction temperature capped at 150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	120 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines rail voltage headroom in amplifier output stages.
I_C (continuous)	8.0 A - Continuous collector current rating at T_C = 25°C; sets maximum sustained output current capability.
P_D (T_C = 25°C)	50 W - Total device power dissipation limit at case temperature 25°C; determines heatsink sizing baseline.
f_T	30 MHz - Current gain–bandwidth product at I_C = 500 mA, V_CE = 10 V; ensures adequate small-signal gain at audio frequencies up to 20 kHz with margin.
R_JC	2.5 °C/W - Junction-to-case thermal resistance; enables direct calculation of ΔT_J−C = P_D × R_JC for thermal interface design.
h_FE (min)	40 @ I_C = 0.1 A - Minimum DC current gain at low current; ensures reliable turn-on and bias stability in driver networks.
V_CE(sat)	≤0.5 V @ I_C/I_B = 10 - Saturation voltage defining conduction loss and thermal load during active switching in quasi-linear operation.

Pinout & Package

Package: TO-220, Case 221A, Style 1 - 3-pin plastic power package with metal tab (collector-connected), 10.10 × 15.12 × 4.45 mm footprint, 2.54 mm pin pitch, lead-free (G suffix).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased BJT operation; requires current-limited drive due to h_FE-dependent base current demand.
2 & 4	Collector	High-current output node electrically tied to metal tab; must be isolated from heatsink unless circuit ground reference permits.
3	Emiter	Emitter output node; forms common-emitter configuration with collector and base; referenced to system ground or negative rail in typical audio output topologies.

Key Features

Feature	Design Value
High f_T bandwidth	30 MHz - Enables faithful reproduction of fast transients and wide audio bandwidth without gain roll-off in driver stages.
Robust SOA	Second-breakdown-limited safe operating area up to 120 V / 8 A at T_C = 25°C - Supports reliable operation under reactive speaker loads and clipping conditions.
Low thermal resistance	R_JC = 2.5 °C/W - Reduces junction temperature rise per watt, improving reliability and enabling higher power density in compact amplifiers.
Pb-free & RoHS compliant	G-suffix package - Meets global environmental compliance requirements for industrial and consumer audio equipment manufacturing.
Linear gain linearity	h_FE variation ≤2× from 0.1 A to 3 A - Minimizes harmonic distortion in Class AB output stages by maintaining consistent current amplification across signal swing.

Applications

High-Fidelity Audio Amplifiers	Professional Audio Power Modules
Use Scenario: Final output driver in discrete Class AB power amplifiers delivering 50–200 W into 4–8 Ω loudspeakers. IC Role / Device Role / Timing Role: NPN complementary driver transistor paired with MJE15029 (PNP) in push-pull output stage; handles positive half-cycle current delivery. Use Value: 120 V_CEO and 8 A rating support ±40 V rails with headroom for transient peaks; 30 MHz f_T preserves slew rate >20 V/μs.	Use Scenario: Output stage in rack-mount professional power amplifiers requiring long-term reliability under continuous high-power operation. IC Role / Device Role / Timing Role: High-current linear switch in thermally managed output modules; mounted on forced-air heatsinks with thermal shutdown monitoring. Use Value: R_JC = 2.5 °C/W enables <15°C junction rise at 30 W dissipation; SOA curve validated to 10 ms pulses for music program peaks.
Studio Monitor Driver Circuits	Active Crossover Amplifier Stages
Use Scenario: Midrange/tweeter driver in bi/tri-amped studio monitors where low distortion and fast settling are critical. IC Role / Device Role / Timing Role: Linear gain block in active filter-coupled output path; biased in Class A/AB for minimal crossover distortion. Use Value: h_FE ≥40 at low I_C ensures stable quiescent current control; V_CE(sat) ≤0.5 V minimizes idle-stage voltage drop and thermal drift.	Use Scenario: Output buffer in multi-way active loudspeaker crossovers handling band-limited signals up to 20 kHz. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate emitter-follower or common-emitter driver feeding passive or active filter networks. Use Value: 30 MHz f_T and linear h_FE ensure flat group delay and phase coherence across full audio band; TO-220 mechanical rigidity resists microphonics.

High-Fidelity Audio Amplifiers

Professional Audio Power Modules

Use Scenario: Final output driver in discrete Class AB power amplifiers delivering 50–200 W into 4–8 Ω loudspeakers.

IC Role / Device Role / Timing Role: NPN complementary driver transistor paired with MJE15029 (PNP) in push-pull output stage; handles positive half-cycle current delivery.

Use Value: 120 V_CEO and 8 A rating support ±40 V rails with headroom for transient peaks; 30 MHz f_T preserves slew rate >20 V/μs.

Use Scenario: Output stage in rack-mount professional power amplifiers requiring long-term reliability under continuous high-power operation.

IC Role / Device Role / Timing Role: High-current linear switch in thermally managed output modules; mounted on forced-air heatsinks with thermal shutdown monitoring.

Use Value: R_JC = 2.5 °C/W enables <15°C junction rise at 30 W dissipation; SOA curve validated to 10 ms pulses for music program peaks.

Studio Monitor Driver Circuits

Active Crossover Amplifier Stages

Use Scenario: Midrange/tweeter driver in bi/tri-amped studio monitors where low distortion and fast settling are critical.

IC Role / Device Role / Timing Role: Linear gain block in active filter-coupled output path; biased in Class A/AB for minimal crossover distortion.

Use Value: h_FE ≥40 at low I_C ensures stable quiescent current control; V_CE(sat) ≤0.5 V minimizes idle-stage voltage drop and thermal drift.

Use Scenario: Output buffer in multi-way active loudspeaker crossovers handling band-limited signals up to 20 kHz.

IC Role / Device Role / Timing Role: Low-noise, high-slew-rate emitter-follower or common-emitter driver feeding passive or active filter networks.

Use Value: 30 MHz f_T and linear h_FE ensure flat group delay and phase coherence across full audio band; TO-220 mechanical rigidity resists microphonics.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15030G	Higher V_CEO = 150 V; identical package, pinout, and f_T; h_FE min = 40 at same test conditions.	Supports higher supply rails (±50 V+); otherwise interchangeable in existing 120 V designs with margin.	Select MJE15030G when designing for >120 V rail systems or requiring extended voltage safety margin.
2SC5200	V_CEO = 230 V, I_C = 15 A, f_T = 30 MHz, TO-3P package; not pin-compatible; higher power and voltage ratings.	Requires PCB layout change and larger heatsink; used in >100 W high-end amplifiers where MJE15028 reaches thermal limits.	Choose 2SC5200 only when upgrading power capacity beyond 50 W continuous or needing >150 V headroom.

Compared with MJE15030G and 2SC5200, the MJE15028 offers optimal balance of voltage rating, thermal performance, and board-space efficiency for 50–80 W audio output stages using ±35–40 V rails, while maintaining proven reliability in decades of commercial amplifier designs.

Availability

MJE15028 is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, professional audio power modules, and studio monitor driver circuits requiring stable component supply and long-term production continuity.

Supply support for MJE15028 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.

The MJE15028 belongs to onsemi's complementary silicon power transistor family designed specifically for high-fidelity audio amplifier driver stages, emphasizing linearity, thermal robustness, and SOA integrity under dynamic reactive loads.

FAQ

What is the maximum collector-emitter voltage rating for the MJE15028?

The MJE15028 has a maximum collector-emitter voltage (V_CEO) rating of 120 Vdc under open-base conditions. This rating is confirmed in the Absolute Maximum Ratings table of the official onsemi datasheet (Rev. 8, December 2024) and defines the upper limit for DC voltage applied between collector and emitter before risk of avalanche breakdown. Exceeding this value may cause permanent device failure.

Is the MJE15028 pin-compatible with the MJE15030G?

Yes, the MJE15028 and MJE15030G share identical TO-220 package (Case 221A, Style 1), pin assignment (Pin 1 = Base, Pins 2 & 4 = Collector, Pin 3 = Emitter), and mechanical dimensions. Both are NPN transistors with matching pinout and mounting interface, allowing direct substitution in layouts designed for either part-though system-level voltage derating must account for the MJE15030G's higher 150 V_CEO rating.

What is the thermal resistance from junction to case (R_JC) for the MJE15028?

The MJE15028 has a maximum junction-to-case thermal resistance (R_JC) of 2.5 °C/W, as specified in the Thermal Characteristics section of the onsemi datasheet. This value is measured under standard mounting conditions with proper thermal interface material and is critical for calculating junction temperature rise (ΔT_J = P_D × R_JC) when designing heatsink solutions for the MJE15028 in high-power audio applications.

Does the MJE15028 meet RoHS requirements?

Yes, the MJE15028G variant is explicitly marked as Pb-free and RoHS compliant per the onsemi datasheet. The "G" suffix denotes lead-free packaging, and compliance is documented in the Features section and Ordering Information table. All MJE15028G units supplied by Aetrix Electronics conform to EU RoHS Directive 2011/65/EU and related amendments for restricted substances.

What is the minimum DC current gain (h_FE) of the MJE15028 at 4.0 A collector current?

The minimum DC current gain (h_FE) of the MJE15028 is 20 at I_C = 4.0 A, V_CE = 2.0 V, and T_C = 25°C, as stated in the Electrical Characteristics table. This parameter ensures predictable base drive requirements in high-current output stages and confirms the MJE15028 maintains usable gain even near its continuous current limit-critical for stable Class AB biasing in audio amplifier designs using the MJE15028.

MJE15028 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):: 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

MJE15028 FAQ

1.How can I place an order for MJE15028 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE15028 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 MJE15028 reliable?

The price and inventory of MJE15028 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE15028 is usually 5 days.

3.What payment methods are accepted for MJE15028?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE15028 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE15028?

MJE15028 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE15028 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 MJE15028?

For technical support, including MJE15028 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE15028 requirements.

6.How does Aetrix verify that MJE15028 is sourced from the original manufacturer or authorized distributors?

All MJE15028 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 MJE15028 meets industry standards.

7.What is the process for return or replacement of MJE15028?

All MJE15028 units undergo pre-shipment inspection (PSI). If there is an issue with MJE15028, 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 MJE15028 part is unused and in its original packaging.

Return procedure for MJE15028:

1.Submit a request within 90 days.

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

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