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onsemi NJL0281DG
- Part No.:
- NJL0281DG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-264-5
- Datasheet:
-
NJL0281DG.pdf
- Description:
- TRANS NPN 260V 15A TO-264
- Quantity:
- Payment:
- Shipping:
Inventory:132
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Product details
Overview
NJL0281DG from onsemi is a complementary NPN bipolar power transistor with integrated thermal tracking diode, designed for high-fidelity audio amplifier output stages. It delivers 15 A continuous collector current, 260 V collector-emitter voltage, 180 W power dissipation at TC = 25 °C, and features instant thermal bias tracking to eliminate equilibrium lag in Class AB amplifier bias networks.
For engineers reviewing the NJL0281DG datasheet, pinout, applications, or equivalent options, this device is selected for precision thermal-coupled biasing in high-power discrete audio amplifiers where dynamic temperature response and bias stability directly impact distortion performance and long-term reliability.
Technical Context
The NJL0281DG integrates a matched monolithic diode thermally coupled to the transistor die, enabling real-time junction temperature feedback for bias control circuits. Its TO-264 package provides low 0.694 °C/W junction-to-case thermal resistance and supports high safe operating area (SOA) up to 260 V and 15 A DC.
This device operates as a high-voltage, high-current NPN output switch with hFE = 75–150 (IC = 0.5–3 A), fT = 30 MHz, VCE(sat) ≤ 1.0 V (IC = 5 A, IB = 0.5 A), and Cob ≤ 400 pF - parameters optimized for linear audio applications rather than switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 260 V - Supports rail voltages up to ±130 V in push-pull amplifier topologies without breakdown. |
| IC (continuous) | 15 A - Enables high-output-power audio stages delivering >300 W into 4 Ω loads with proper heatsinking. |
| PD @ TC = 25 °C | 180 W - Requires robust thermal management but allows sustained high-current operation in Class AB designs. |
| RJC | 0.694 °C/W - Enables efficient heat transfer to external heatsink, critical for maintaining stable bias under dynamic thermal load. |
| fT | 30 MHz - Ensures adequate gain-bandwidth for full-audio-spectrum linearity without high-frequency roll-off in driver stages. |
| hFE | 75–150 - Provides predictable current amplification across 0.5–3 A range, simplifying emitter-degeneration and feedback network design. |
| VCE(sat) | ≤1.0 V @ IC = 5 A - Minimizes conduction loss and localized heating during peak output current events. |
Pinout & Package
Package: TO-264 (Case 340AA, Style 1), 5-lead thermally enhanced power package with isolated mounting hole and integral thermal pad. Pb-free (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input for bipolar current amplification; requires external bias network with matched NJL0302DG PNP pair. |
| 2 | Emitter | Main current return path; electrically tied to thermal substrate in TO-264 for low-inductance grounding in high-current paths. |
| 3 | Collector | High-current output node; connected to positive rail in common-emitter output stage configurations. |
| 4 | Anode | Integrated thermal sensing diode anode; used in bias servo loops to track transistor junction temperature in real time. |
| 5 | Cathode | Integrated thermal sensing diode cathode; completes monolithic diode path for temperature-dependent voltage reference generation. |
Key Features
| Feature | Design Value |
|---|---|
| Thermally matched bias diode | Monolithic integration ensures <±1 °C thermal tracking between transistor junction and diode, eliminating manual bias trimming. |
| Instant thermal bias tracking | Removes 10–60 second thermal equilibrium delay typical in discrete bias networks, preserving transient fidelity in music reproduction. |
| High SOA (260 V / 15 A) | Supports ruggedized audio output stages that withstand reactive speaker loads and clipping without secondary breakdown. |
| Absolute thermal integrity | Guarantees stable hFE and VBE over −65 °C to +150 °C junction range, preventing thermal runaway in sealed enclosures. |
| Pb-free TO-264 package | Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow profiles and industrial assembly processes. |
Applications
| Home Audio Amplifiers | Professional PA Systems |
|---|---|
Use Scenario: High-power stereo amplifiers delivering 200–500 W per channel into 4–8 Ω loudspeakers in residential environments. IC Role / Device Role / Timing Role: NPN output transistor in complementary Class AB push-pull stage, paired with NJL0302DG. Use Value: ThermalTrak diode enables zero-adjustment factory calibration and eliminates drift-induced crossover distortion over ambient temperature swings. |
Use Scenario: Rack-mounted power amplifiers for theater sound reinforcement, stadium line arrays, and distributed PA systems. IC Role / Device Role / Timing Role: Primary output switching element handling sustained 10–20 A peak currents with high-voltage swing capability. Use Value: 260 V VCEO and high SOA prevent failure during short-duration transients caused by cable faults or speaker impedance dips. |
| Studio Monitor Power Stages | High-End AV Receivers |
Use Scenario: Bi-amplified near-field studio monitors requiring ultra-low THD+N and wide dynamic range. IC Role / Device Role / Timing Role: Final gain stage transistor with direct-coupled bias network leveraging integrated thermal diode. Use Value: Instant thermal tracking preserves harmonic accuracy during rapid program material transitions (e.g., drum transients), reducing intermodulation distortion. |
Use Scenario: Multi-channel home theater receivers integrating 5.1/7.1 analog power amplification in compact chassis. IC Role / Device Role / Timing Role: Output device in thermally dense multi-transistor banks per channel, mounted on shared heatsink. Use Value: Matched thermal response across all channels ensures consistent bias point shift during warm-up, avoiding channel imbalance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SC5200 | No integrated thermal diode; separate bias diode required; VCEO = 230 V; hFE = 80–160; RJC = 0.83 °C/W. | Suitable for cost-sensitive audio amps where manual bias adjustment is acceptable; lacks real-time thermal tracking. | Select when thermal servo loop complexity must be minimized and thermal drift tolerance is >±5 mV/°C. |
| MJE15030G | Lower VCEO = 200 V; same TO-264 package; includes thermal diode but not monolithically matched; RJC = 0.75 °C/W. | Used in mid-power pro-audio modules (<200 W/channel); requires external compensation for thermal lag. | Select when operating rail voltages remain ≤±100 V and legacy board layouts constrain footprint reuse. |
Compared with 2SC5200 and MJE15030G, NJL0281DG uniquely combines monolithic thermal matching, 260 V rating, and 180 W dissipation in a single TO-264 package-enabling bias-stable, high-power audio output stages without external thermal compensation components or iterative trim adjustments.
Availability
NJL0281DG is available at Aetrix Electronics and suitable for high-end consumer audio products, professional PA systems, and studio monitor power stages requiring stable component supply and long-term design continuity.
Supply support for NJL0281DG 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, cloud, and IoT applications.
The ThermalTrak family-including NJL0281DG-is engineered specifically for high-fidelity linear audio amplifier output stages, where precise thermal coupling between transistor and bias diode eliminates manual calibration and improves long-term bias stability.
FAQ
What is the primary function of the integrated diode in NJL0281DG?
The integrated diode in NJL0281DG is a monolithically fabricated thermal sensor diode matched to the transistor's junction temperature. It provides real-time voltage feedback proportional to absolute temperature, enabling bias servo circuits to dynamically adjust base current and maintain stable quiescent current in audio output stages without manual trimming or thermal lag.
Is NJL0281DG pin-compatible with NJL0302DG?
No-NJL0281DG (NPN) and NJL0302DG (PNP) are complementary devices intended for use together in push-pull output stages, but they are not pin-compatible. NJL0281DG has Base–Emitter–Collector–Anode–Cathode pinout (1–2–3–4–5), while NJL0302DG uses the same TO-264 package but assigns pins differently to match PNP polarity and thermal diode orientation.
Can NJL0281DG replace standard power transistors like 2N3055 in audio amplifiers?
NJL0281DG can replace legacy devices such as 2N3055 in high-performance audio designs, but only with circuit modifications: its integrated thermal diode requires connection to a bias servo amplifier, and its higher VCEO (260 V vs. 60 V) and hFE range demand updated base drive and feedback network design. Direct drop-in replacement is not supported.
What does the "G" suffix signify in NJL0281DG?
"G" denotes a Pb-free (lead-free) version of the NJL0281DG, compliant with RoHS Directive 2011/65/EU. It uses matte tin plating on leads and Pb-free solder-compatible internal construction, validated for reflow profiles up to 260 °C peak temperature per JEDEC J-STD-020.
Does NJL0281DG require external heatsinking, and what is the minimum thermal resistance needed?
Yes-NJL0281DG requires external heatsinking due to its 180 W power dissipation rating. To maintain TJ ≤ 150 °C at maximum PD, the total thermal resistance (RJC + RCS + RSA) must be ≤ 0.83 °C/W. With RJC = 0.694 °C/W, heatsink thermal resistance (RSA) must be ≤ 0.136 °C/W when interface resistance (RCS) is minimized using proper thermal compound and mounting pressure.
NJL0281DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-264-5
- Packaging:
- Tube
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 15 A
- Voltage - Collector Emitter Breakdown (Max):
- 260 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 500mA, 5A
- Current - Collector Cutoff (Max):
- 10µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 75 @ 3A, 5V
- Power - Max:
- 180 W
- Frequency - Transition:
- 30MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-264
NJL0281DG FAQ
1.How can I place an order for NJL0281DG through Aetrix?
Please submit a Request for Quotation (RFQ) for NJL0281DG 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 NJL0281DG reliable?
The price and inventory of NJL0281DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NJL0281DG is usually 5 days.
3.What payment methods are accepted for NJL0281DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NJL0281DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NJL0281DG?
NJL0281DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NJL0281DG 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 NJL0281DG?
For technical support, including NJL0281DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NJL0281DG requirements.
6.How does Aetrix verify that NJL0281DG is sourced from the original manufacturer or authorized distributors?
All NJL0281DG 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 NJL0281DG meets industry standards.
7.What is the process for return or replacement of NJL0281DG?
All NJL0281DG units undergo pre-shipment inspection (PSI). If there is an issue with NJL0281DG, 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 NJL0281DG part is unused and in its original packaging.
Return procedure for NJL0281DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NJL0281DG Tags
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