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onsemi MJL3281A
- Part No.:
- MJL3281A
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-264-3, TO-264AA
- Datasheet:
-
MJL3281A.pdf
- Description:
- TRANS NPN 260V 15A TO-264
- Quantity:
- Payment:
- Shipping:
Inventory:7,369
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Product details
Overview
MJL3281A from onsemi is an NPN silicon power bipolar transistor designed for high-fidelity audio amplifier output stages, featuring 260 VCEO, 15 A continuous collector current, 200 W total power dissipation at TC = 25°C, fT = 30 MHz, and RθJC = 0.625°C/W - enabling robust thermal management in Class AB push-pull configurations.
For engineers reviewing the MJL3281A datasheet, pinout, applications, or equivalent options, key selection considerations include safe operating area (SOA) integrity at high VCE/IC combinations, gain linearity across 50 mA–5 A, complementary matching with MJL1302A, and TO-264 package mounting compatibility with heatsink interfaces.
Technical Context
The MJL3281A operates as a linear-mode power switch in analog audio output stages, with DC current gain (hFE) maintained between 75–150 from 500 mA to 5 A at VCE = 5 V, supporting accurate signal reproduction without crossover distortion. Its high BVCEO and BVCBO (both 260 V) allow operation in high-rail amplifier designs up to ±100 V supply.
Second breakdown limits are specified at 4 A (VCE = 50 V, t = 1 s) and 1 A (VCE = 100 V, t = 1 s), defining non-repetitive pulse capability. Output capacitance (Cob ≤ 600 pF at VCB = 10 V) and fT = 30 MHz support wideband audio bandwidth without instability in properly compensated circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 260 Vdc - supports ±100 V rail amplifiers with margin against transient overvoltage |
| IC (continuous) | 15 Adc - delivers full output power in 100–200 W stereo channels |
| PD @ TC = 25°C | 200 W - requires low-thermal-resistance heatsinking (RθJC = 0.625°C/W) |
| fT | 30 MHz - ensures stable open-loop bandwidth beyond 100 kHz for feedback compensation |
| hFE @ IC = 5 A | 75 min - maintains predictable bias current and thermal tracking in parallel output arrays |
| VCE(sat) @ IC = 10 A | ≤3 Vdc - limits conduction loss to <30 W per device at full load |
| Cob | ≤600 pF @ VCB = 10 V - minimizes Miller effect in high-gain driver stages |
Pinout & Package
Package: TO-264 (Case 340G), isolated metal tab, screw-mount compatible, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Low-impedance control input requiring ~1 A drive for full 15 A output; connects to driver stage emitter follower |
| 2 | Collector | Main high-current output node; electrically connected to metal tab - must be insulated from heatsink unless common-collector topology used |
| 3 | Emitter | Reference terminal for output stage; ties to speaker ground or global power ground; carries full load current with minimal parasitic inductance |
Key Features
| Feature | Design Value |
|---|---|
| Exceptional SOA | Defined curves up to 100 V/10 A (1 s) - enables reliable operation under clipping and reactive load conditions |
| NPN/PNP gain matching | ±10% hFE match between MJL3281A and MJL1302A from 50 mA to 5 A - ensures symmetrical push-pull linearity |
| High BVCEO | 260 V - allows use in high-voltage discrete amplifiers without derating or series stacking |
| High fT | 30 MHz - preserves phase margin in multi-stage feedback loops with >1 MHz unity-gain bandwidth |
| Gain linearity | hFE variation <2:1 from 0.5 A to 5 A - reduces harmonic distortion in Class AB output stages |
Applications
| Home Audio Amplifiers | Professional PA Systems |
|---|---|
|
Use Scenario: Discrete Class AB output stage in 150 W/channel stereo receivers driving 4–8 Ω speakers with low THD+N. IC Role / Device Role / Timing Role: Primary power switching element delivering amplified audio current to loudspeaker load. Use Value: High SOA and gain linearity minimize intermodulation distortion during dynamic transients and bass-heavy program material. |
Use Scenario: Output device in 500 W+ mono block amplifiers for stadium sound reinforcement with reactive 4 Ω loads. IC Role / Device Role / Timing Role: High-current, high-voltage linear amplifier transistor handling peak currents >20 A in short bursts. Use Value: 260 V rating and second-breakdown immunity prevent failure during impedance dips and long-term reliability under thermal cycling. |
| Theater Sound Systems | Studio Monitor Amplifiers |
|
Use Scenario: Complementary pair (MJL3281A + MJL1302A) in bi-amplified cinema subwoofer channels with ±90 V rails. IC Role / Device Role / Timing Role: NPN half of symmetrical output stage delivering clean low-frequency power with tight thermal coupling. Use Value: 10% hFE matching ensures balanced current sharing and minimized even-order harmonic distortion. |
Use Scenario: High-fidelity reference amplifier output stage requiring <0.01% THD at full rated power into 6 Ω. IC Role / Device Role / Timing Role: Linear power transistor operating in active region with precise DC bias control and minimal thermal drift. Use Value: Low Cob and high fT preserve wide open-loop bandwidth for deep global negative feedback without oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SC5200 | Lower VCEO (230 V), higher hFE spread (50–150), same TO-3P package but non-isolated tab | Less margin in ±100 V rail systems; requires insulating hardware if collector-to-heatsink isolation needed | Select when cost sensitivity outweighs SOA margin and thermal isolation requirements |
| KSC5027 | Higher fT (40 MHz), lower PD (150 W), smaller TO-247 package with lower RθJC (0.83°C/W) | Better high-frequency response but reduced safe operating area above 50 V/5 A | Select for compact PCB layouts where thermal interface resistance dominates over junction-to-case resistance |
Compared with 2SC5200 and KSC5027, the MJL3281A provides superior safe operating area at high voltage–current combinations and guaranteed gain matching with its complementary PNP partner, making it preferred for high-end audio output stages demanding reliability and symmetry.
Availability
MJL3281A is available at Aetrix Electronics and suitable for home audio amplifiers, professional PA systems, theater sound systems, and studio monitor amplifiers requiring stable component supply and long-term production continuity.
Supply support for MJL3281A 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MJL3281A belongs to onsemi's complementary bipolar power transistor family engineered specifically for high-fidelity linear audio amplifier output stages, emphasizing SOA integrity, gain symmetry, and thermal robustness.
FAQ
What is the maximum continuous collector current rating for the MJL3281A?
The MJL3281A has a maximum continuous collector current (IC) rating of 15 A at case temperature TC = 25°C. This rating assumes adequate heatsinking to maintain junction temperature below 150°C. Derating is required above 25°C at 1.43 W/°C, and actual usable current depends on thermal interface resistance and ambient conditions. The MJL3281A must not exceed its SOA limits under pulsed or transient conditions.
Is the MJL3281A pin-compatible with the 2SC5200?
No, the MJL3281A is not pin-compatible with the 2SC5200. While both use 3-pin power packages, the MJL3281A uses TO-264 (Case 340G) with pinout Base–Collector–Emitter (1–2–3), whereas the 2SC5200 uses TO-3P with pinout Emitter–Base–Collector (1–2–3). Physical mounting, tab isolation, and thermal pad layout differ significantly - direct substitution requires PCB redesign.
Does the MJL3281A require a heatsink, and what thermal resistance is recommended?
Yes, the MJL3281A requires a heatsink due to its 200 W power dissipation capability and RθJC = 0.625°C/W. To maintain TJ ≤ 150°C at full power, total thermal resistance (RθJA) must be ≤ 0.83°C/W, meaning heatsink + interface resistance must be ≤ 0.205°C/W. Forced-air cooling or large finned extrusions are typically required for sustained 15 A operation.
How does the MJL3281A's gain matching with MJL1302A benefit audio amplifier design?
The MJL3281A and MJL1302A are characterized to have hFE within ±10% across 50 mA–5 A, ensuring matched current gain in complementary push-pull output stages. This minimizes crossover distortion, improves thermal tracking, and simplifies bias network design - directly contributing to lower THD and improved channel balance in high-end MJL3281A-based amplifiers.
Can the MJL3281A be used in switching power supplies?
The MJL3281A is not optimized for switching power supply applications. Its design emphasizes linear-mode performance: high SOA, gain linearity, and audio bandwidth - not fast turn-off, low storage time, or ruggedness under hard-switching conditions. Use in SMPS risks secondary breakdown, excessive switching losses, and unreliable commutation. Dedicated switching transistors like MJD127 or FJP13009 are more appropriate.
MJL3281A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-264-3, TO-264AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 15 A
- Voltage - Collector Emitter Breakdown (Max):
- 260 V
- Vce Saturation (Max) @ Ib, Ic:
- 3V @ 1A, 10A
- Current - Collector Cutoff (Max):
- 50µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 75 @ 5A, 5V
- Power - Max:
- 200 W
- Frequency - Transition:
- 30MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-264
MJL3281A FAQ
1.How can I place an order for MJL3281A through Aetrix?
Please submit a Request for Quotation (RFQ) for MJL3281A 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 MJL3281A reliable?
The price and inventory of MJL3281A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJL3281A is usually 5 days.
3.What payment methods are accepted for MJL3281A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJL3281A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJL3281A?
MJL3281A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJL3281A 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 MJL3281A?
For technical support, including MJL3281A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJL3281A requirements.
6.How does Aetrix verify that MJL3281A is sourced from the original manufacturer or authorized distributors?
All MJL3281A 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 MJL3281A meets industry standards.
7.What is the process for return or replacement of MJL3281A?
All MJL3281A units undergo pre-shipment inspection (PSI). If there is an issue with MJL3281A, 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 MJL3281A part is unused and in its original packaging.
Return procedure for MJL3281A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MJL3281A Tags
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MMBT3906LT1G
onsemi
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MMBT3906-7-F
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MMBT2222A-7-F
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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