Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi NJL1302D

Name: NJL1302D
Brand: onsemi
SKU: NJL1302D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: NJL1302D

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-264-5

Datasheet:: NJL1302D.pdf

Description:: TRANS PNP 260V 15A TO-264

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,643

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

NJL1302D from onsemi is a PNP bipolar power transistor in the ThermalTrak family, designed for precision bias tracking in high-fidelity audio amplifier output stages. It delivers 15 A continuous collector current, 260 V V_CEO, 200 W power dissipation at T_C = 25 °C, and features an integrated thermally matched bias diode for real-time junction temperature compensation.

For engineers reviewing the NJL1302D datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (TO-264, 5-lead), confirmed thermal resistance (R_θJC = 0.625 °C/W), safe operating area curves, and validated alternatives for complementary audio power stage design.

Technical Context

The NJL1302D operates as a PNP complement to the NJL3281D NPN device in push-pull audio output stages, with matched thermal characteristics enabling instantaneous bias tracking without external trimmers. Its 5-lead TO-264 package integrates emitter, collector, base, and two discrete diode terminals (anode/cathode) for direct thermal coupling to the output transistor die.

It supports high SOA operation up to 260 V and 15 A with f_T = 30 MHz, Cob ≤ 600 pF, and V_CE(sat) ≤ 3 V at I_C = 10 A / I_B = 1 A - enabling stable Class AB operation under dynamic thermal load without thermal runaway.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	260 Vdc - Enables use in high-voltage audio rails up to ±120 V supply systems.
I_C (continuous)	15 Adc - Supports high-power output stages delivering ≥200 W into 4 Ω loads.
P_D @ T_C = 25 °C	200 W - Requires heatsink with R_θCA ≤ 0.625 °C/W for full-rated operation.
R_θJC	0.625 °C/W - Confirmed thermal path from junction to case enables precise thermal feedback loop design.
f_T	30 MHz - Ensures sufficient gain-bandwidth for stable wideband audio amplification up to 20 kHz.
h_FE @ I_C = 5 A	75–150 - Provides predictable current gain across mid-power operating range for bias network sizing.
V_CE(sat)	≤3 V @ I_C = 10 A / I_B = 1 A - Limits conduction loss and thermal stress during peak output current.

Pinout & Package

Package: TO-264 (Case 340AA), 5-lead, Pb-free (G-suffix), with integrated thermal pad and dual diode terminals for bias tracking.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Primary control terminal for base current injection; referenced to emitter for standard PNP biasing.
2	Emiter	Common emitter node for output stage; connects to negative rail in Class AB topology.
3	Collector	High-current output node; ties to speaker load and positive rail via complementary NPN device.
4	Anode	Thermal sense diode anode; electrically isolated but thermally coupled to transistor junction.
5	Cathode	Thermal sense diode cathode; used with external bias network to track junction temperature in real time.

Key Features

Feature	Design Value
Thermally matched bias diode	Integrated monolithic diode with identical thermal coefficient to transistor junction, eliminating thermal lag in bias networks.
Instant thermal bias tracking	Enables zero-adjustment Class AB operation by dynamically compensating for V_BE drift during signal transients.
High SOA (Safe Operating Area)	Rated for 260 V × 15 A with secondary breakdown protection - supports robust operation under reactive speaker loads.
Absolute thermal integrity	Guaranteed ΔT < 1 °C between diode and transistor junctions under all operating conditions per design validation.
Pb-free TO-264 package	RoHS-compliant construction with thermal pad optimized for mechanical mounting and heat transfer to heatsink.

Applications

Home Amplifiers	Home Receivers
Use Scenario: High-fidelity stereo power amplifiers delivering 100–300 W per channel into 4–8 Ω speakers. IC Role / Device Role / Timing Role: PNP output transistor in complementary pair with NJL3281D, providing negative half-cycle current delivery with real-time thermal bias correction. Use Value: Eliminates need for manual bias adjustment during warm-up and prevents thermal runaway during sustained bass passages.	Use Scenario: Multi-channel AV receivers integrating analog power amplification for front, center, and surround channels. IC Role / Device Role / Timing Role: Output stage transistor in each channel's discrete amplifier module, leveraging ThermalTrak diode terminals for per-channel bias stability. Use Value: Maintains consistent channel balance and low THD+N (<0.05%) across temperature and power levels without trimming components.
Professional Audio Amplifiers	Theater Sound Systems
Use Scenario: Rack-mounted 2U/3U power amplifiers rated for 500–2000 W into low-Z loads (2–4 Ω) in live sound environments. IC Role / Device Role / Timing Role: Primary PNP switching element in high-current output stage, paired with NJL3281D and driven by discrete driver transistors. Use Value: Sustains full-rated output without thermal shutdown during long-duration program material (e.g., EDM, orchestral peaks).	Use Scenario: Distributed line-array amplifiers powering large-format cinema screens and immersive Dolby Atmos speaker arrays. IC Role / Device Role / Timing Role: High-reliability output transistor in redundant amplifier modules, where thermal tracking ensures fail-safe bias stability across ambient shifts (15–45 °C). Use Value: Extends mean time between failures (MTBF) by >3× vs. conventional bias schemes due to elimination of thermal equilibrium lag.

Home Amplifiers

Home Receivers

Use Scenario: High-fidelity stereo power amplifiers delivering 100–300 W per channel into 4–8 Ω speakers.

IC Role / Device Role / Timing Role: PNP output transistor in complementary pair with NJL3281D, providing negative half-cycle current delivery with real-time thermal bias correction.

Use Value: Eliminates need for manual bias adjustment during warm-up and prevents thermal runaway during sustained bass passages.

Use Scenario: Multi-channel AV receivers integrating analog power amplification for front, center, and surround channels.

IC Role / Device Role / Timing Role: Output stage transistor in each channel's discrete amplifier module, leveraging ThermalTrak diode terminals for per-channel bias stability.

Use Value: Maintains consistent channel balance and low THD+N (<0.05%) across temperature and power levels without trimming components.

Professional Audio Amplifiers

Theater Sound Systems

Use Scenario: Rack-mounted 2U/3U power amplifiers rated for 500–2000 W into low-Z loads (2–4 Ω) in live sound environments.

IC Role / Device Role / Timing Role: Primary PNP switching element in high-current output stage, paired with NJL3281D and driven by discrete driver transistors.

Use Value: Sustains full-rated output without thermal shutdown during long-duration program material (e.g., EDM, orchestral peaks).

Use Scenario: Distributed line-array amplifiers powering large-format cinema screens and immersive Dolby Atmos speaker arrays.

IC Role / Device Role / Timing Role: High-reliability output transistor in redundant amplifier modules, where thermal tracking ensures fail-safe bias stability across ambient shifts (15–45 °C).

Use Value: Extends mean time between failures (MTBF) by >3× vs. conventional bias schemes due to elimination of thermal equilibrium lag.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15031	No integrated thermal diode; requires external matched diode and manual bias adjustment circuitry.	Suitable only for fixed-bias or servo-controlled designs; not drop-in for ThermalTrak-based layouts.	Select when redesigning legacy amplifiers without ThermalTrak architecture and cost sensitivity outweighs thermal stability requirements.
BDW84C	Lower V_CEO (120 V), lower f_T (4 MHz), no thermal diode; SOA limited to 100 W at 25 °C.	Restricted to low-voltage (<±60 V) consumer amplifiers; cannot replace NJL1302D in high-SOA or high-fidelity designs.	Choose only for cost-driven, low-power applications where thermal tracking is not required and voltage headroom is limited.

Compared with MJE15031 and BDW84C, the NJL1302D uniquely integrates a monolithic thermal diode with matched thermal response, enabling bias networks that eliminate both thermal lag and manual calibration - a capability neither alternative provides.

Availability

NJL1302D is available at Aetrix Electronics and suitable for high-end consumer audio products, professional audio amplifiers, and theater sound systems requiring stable component supply and traceable sourcing for production continuity.

Supply support for NJL1302D 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The ThermalTrak product line was engineered specifically for high-fidelity audio amplifier output stages, addressing thermal drift-induced distortion and reliability issues in discrete Class AB designs.

FAQ

Is NJL1302D still in active production?

No - the NJL1302D is officially discontinued per onsemi's February 2026 datasheet revision. However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle support including last-time buy planning and cross-reference guidance for ongoing production programs using NJL1302D.

What is the function of pins 4 and 5 on NJL1302D?

Pins 4 (Anode) and 5 (Cathode) form a monolithic silicon diode thermally coupled to the PNP transistor junction. In circuit, they replace external bias diodes by providing real-time V_BE temperature compensation - a core feature of the ThermalTrak architecture unique to NJL1302D and its NPN counterpart NJL3281D.

Can NJL1302D be used without its thermal diode terminals?

Yes - NJL1302D functions as a standard PNP power transistor with pins 1–3 (Base, Emitter, Collector). Pins 4 and 5 may be left unconnected, but doing so forfeits ThermalTrak's key benefit: automatic bias tracking. The device remains electrically functional but loses its defining thermal stabilization capability.

What is the maximum safe operating temperature for NJL1302D?

The NJL1302D has a specified junction temperature range of −65 °C to +150 °C. For reliable long-term operation, peak junction temperature should be limited to ≤135 °C under transient conditions and ≤125 °C under continuous DC load, per onsemi's SOA derating guidelines in the NJL1302D datasheet.

How does NJL1302D differ from standard PNP transistors like TIP2955?

Unlike TIP2955, the NJL1302D integrates a thermally matched diode (pins 4–5) for real-time bias tracking, offers higher f_T (30 MHz vs. 3 MHz), superior SOA (260 V × 15 A), and tighter h_FE consistency across current range - all optimized for high-fidelity audio rather than general-purpose switching.

NJL1302D 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):: 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

NJL1302D FAQ

1.How can I place an order for NJL1302D through Aetrix?

Please submit a Request for Quotation (RFQ) for NJL1302D 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 NJL1302D reliable?

The price and inventory of NJL1302D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NJL1302D is usually 5 days.

3.What payment methods are accepted for NJL1302D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NJL1302D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NJL1302D?

NJL1302D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NJL1302D 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 NJL1302D?

For technical support, including NJL1302D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NJL1302D requirements.

6.How does Aetrix verify that NJL1302D is sourced from the original manufacturer or authorized distributors?

All NJL1302D 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 NJL1302D meets industry standards.

7.What is the process for return or replacement of NJL1302D?

All NJL1302D units undergo pre-shipment inspection (PSI). If there is an issue with NJL1302D, 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 NJL1302D part is unused and in its original packaging.

Return procedure for NJL1302D:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…