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onsemi NJL4302DG
- Part No.:
- NJL4302DG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-264-5
- Datasheet:
-
NJL4302DG.pdf
- Description:
- TRANS PNP 350V 15A TO-264
- Quantity:
- Payment:
- Shipping:
Inventory:9,339
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Product details
Overview
NJL4302DG from onsemi is a PNP bipolar power transistor with integrated thermal tracking diode, designed for high-fidelity audio amplifier output stages. It delivers 15 A continuous collector current, 350 V VCEO, 230 W power dissipation at TC = 25°C, and features thermally matched bias diode for instant thermal bias tracking in push-pull configurations.
For engineers reviewing the NJL4302DG datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) at 100 ms–1 s pulse widths, VCE(sat) ≤ 1.0 V at IC = 8 A/IB = 0.8 A, hFE ≥ 40 at IC = 8 A, and TO-264 package thermal resistance RθJC = 0.54°C/W.
Technical Context
The NJL4302DG operates as a complementary PNP counterpart to the NPN NJL4281D in ThermalTrak™ audio output pairs. Its integrated monolithic diode shares identical thermal mass and junction temperature response with the transistor die, enabling real-time bias compensation without external thermal sensors or manual trimming.
This architecture eliminates thermal equilibrium lag during dynamic signal transients and maintains stable quiescent current across ambient and junction temperature shifts - critical for Class AB amplifier designs requiring low crossover distortion and long-term DC offset stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 350 V - Supports rail voltages up to ±175 V in high-power audio amplifiers |
| IC (cont.) | 15 A - Enables >500 W RMS output into 4 Ω loads with proper heatsinking |
| PD @ TC=25°C | 230 W - Requires low-thermal-resistance mounting (e.g., <0.2°C/W heatsink + interface) |
| RθJC | 0.54°C/W - Enables precise junction temperature estimation from case measurement |
| hFE @ IC=8 A | ≥40 - Ensures sufficient base drive margin for linear operation at high current |
| VCE(sat) @ IC/IB=10 | ≤1.0 V - Limits conduction loss to <8 W at 8 A, improving thermal efficiency |
| fT | 35 MHz - Supports full-audio-band gain stability with adequate phase margin |
Pinout & Package
Package: TO-264 (Case 340AA), 5-lead, Pb-free, isolated metal tab. Mounting hole ∅P = 3.00–3.51 mm; thermal pad defined by D (25.58–26.59 mm) × E (19.30–20.29 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-active bias; requires current-limited drive due to IB(max) = 1.5 A |
| 2 | Emitter | High-current return path; electrically tied to metal tab (isolated per datasheet) |
| 3 | Collector | Main power output node; connected to heatsink via isolated tab |
| 4 | Anode | Integrated thermal tracking diode anode - used for bias voltage generation |
| 5 | Cathode | Integrated thermal tracking diode cathode - referenced to emitter for matched ΔVBE |
Key Features
| Feature | Design Value |
|---|---|
| Thermally matched bias diode | Monolithic integration ensures <±0.5°C thermal tracking error between transistor and diode junctions |
| Instant thermal bias tracking | Eliminates 10–60 second warm-up drift in quiescent current during amplifier startup |
| High SOA (100 ms, 100 V) | Supports safe switching into reactive speaker loads without secondary breakdown |
| Absolute thermal integrity | Enables stable DC bias over −65°C to +150°C junction range without recalibration |
| Pb-free TO-264 package | Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow profiles |
Applications
| Home Audio Amplifiers | Professional PA Systems |
|---|---|
Use Scenario: Dual-rail Class AB output stage in 200–1000 W stereo receivers driving 4–8 Ω loudspeakers. IC Role / Device Role / Timing Role: PNP output switch in complementary pair with NJL4281DG; provides negative half-cycle current sourcing. Use Value: Maintains <±5 mV DC offset drift over 30-minute warm-up, reducing audible thump and protecting tweeters. | Use Scenario: High-reliability output module in touring-grade powered mixers and line arrays. IC Role / Device Role / Timing Role: Primary PNP output device in paralleled configurations for >2 kW per channel applications. Use Value: Survives repeated 100 ms current surges up to 30 A without SOA violation, ensuring concert-grade uptime. |
| Theater Sound Systems | Studio Monitor Power Stages |
Use Scenario: Distributed multi-channel amplification in cinema auditoriums with long cable runs and reactive impedance. IC Role / Device Role / Timing Role: Output transistor handling low-frequency transients (20–120 Hz) with minimal thermal runaway risk. Use Value: Delivers consistent damping factor >200 across 20–200 Hz band due to stable hFE and VCE(sat) under thermal stress. | Use Scenario: Precision near-field monitor power amplifier requiring ultra-low distortion at 1–3 W idle power. IC Role / Device Role / Timing Role: Bias-stabilized output device operating in Class AB with <10 mA quiescent current. Use Value: Achieves THD+N <0.002% at 1 kHz/10 W via real-time thermal compensation of VBE drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power audio PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD47 | No integrated thermal diode; hFE min = 30 at IC = 8 A; RθJC = 1.0°C/W | Requires external thermal sensor and bias adjustment circuitry; lower SOA at t > 10 ms | Use where cost sensitivity outweighs thermal stability requirements and PCB space allows discrete bias network. |
| 2SA1943 | TO-3P package; VCEO = 230 V; PD = 150 W; no monolithic diode | Limited to ≤±115 V rails; higher thermal resistance increases junction temperature uncertainty | Select when legacy design compatibility or availability of TO-3P sockets is mandatory; verify SOA derating at 100 V. |
Compared with MJD47 and 2SA1943, the NJL4302DG provides superior thermal bias stability without external components, enables higher rail voltage operation (±175 V), and delivers 53% greater power dissipation capability - directly translating to higher output headroom and reduced heatsink size in new audio amplifier designs.
Availability
NJL4302DG is available at Aetrix Electronics and suitable for home audio amplifiers, professional PA systems, and theater sound systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for NJL4302DG 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, cloud, and consumer markets.
The ThermalTrak™ transistor family, including NJL4302DG, was engineered specifically for high-end audio amplifier output stages where thermal-induced bias drift degrades fidelity - delivering monolithic thermal matching to eliminate manual calibration and improve production yield.
FAQ
What is the function of pins 4 and 5 on the NJL4302DG?
Pins 4 (Anode) and 5 (Cathode) form an integrated silicon diode monolithically fabricated on the same die as the PNP transistor. This diode tracks the transistor's junction temperature with <±0.5°C accuracy and is used in bias networks to dynamically adjust base-emitter voltage, eliminating thermal lag in NJL4302DG-based amplifier designs.
Does the NJL4302DG require external bias compensation components?
No - the NJL4302DG integrates a thermally matched diode that replaces external bias diodes or temperature sensors. When wired correctly (diode cathode to emitter, anode to bias network), it provides automatic VBE compensation, removing the need for manual trimmers or thermistors in the bias circuit of NJL4302DG amplifier stages.
What is the maximum safe operating area (SOA) limit for the NJL4302DG at 100 V and 100 ms?
Per Figure 14 in the official datasheet, the NJL4302DG supports up to 10 A at VCE = 100 V for 100 ms (non-repetitive). This SOA boundary ensures reliable operation into reactive speaker loads without secondary breakdown, a critical specification verified in NJL4302DG application circuits for professional audio.
Can the NJL4302DG be used as a direct replacement for the NJL4302D?
Yes - the NJL4302DG is the Pb-free version of NJL4302D, with identical electrical specifications, pinout, thermal performance, and mechanical dimensions. The "G" suffix denotes RoHS-compliant packaging; all design documentation, layout footprints, and thermal models for NJL4302D apply directly to NJL4302DG.
What is the typical VBE(on) of the NJL4302DG at IC = 8 A and TJ = 25°C?
According to Figure 8 in the datasheet, the typical VBE(on) of the NJL4302DG is 1.25 V at IC = 8 A and TJ = 25°C. This value decreases to ~1.05 V at TJ = 100°C, confirming predictable thermal coefficient behavior essential for stable bias design using NJL4302DG.
NJL4302DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-264-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 15 A
- Voltage - Collector Emitter Breakdown (Max):
- 350 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 800mA, 8A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 80 @ 5A, 5V
- Power - Max:
- 230 W
- Frequency - Transition:
- 35MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-264
NJL4302DG FAQ
1.How can I place an order for NJL4302DG through Aetrix?
Please submit a Request for Quotation (RFQ) for NJL4302DG 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 NJL4302DG reliable?
The price and inventory of NJL4302DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NJL4302DG is usually 5 days.
3.What payment methods are accepted for NJL4302DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NJL4302DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NJL4302DG?
NJL4302DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NJL4302DG 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 NJL4302DG?
For technical support, including NJL4302DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NJL4302DG requirements.
6.How does Aetrix verify that NJL4302DG is sourced from the original manufacturer or authorized distributors?
All NJL4302DG 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 NJL4302DG meets industry standards.
7.What is the process for return or replacement of NJL4302DG?
All NJL4302DG units undergo pre-shipment inspection (PSI). If there is an issue with NJL4302DG, 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 NJL4302DG part is unused and in its original packaging.
Return procedure for NJL4302DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NJL4302DG Tags
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MMBT3906-7-F
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MMBT2222A-7-F
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BC846BLT1G
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Nexperia USA Inc.
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MMBTA06LT1G
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