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

onsemi NJVBUB323ZT4G

Name: NJVBUB323ZT4G
Brand: onsemi
SKU: NJVBUB323ZT4G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NJVBUB323ZT4G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: NJVBUB323ZT4G.pdf

Description:: TRANS NPN DARL 350V 10A D2PAK

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Product details

Overview

NJVBUB323ZT4G from onsemi is an NPN silicon power Darlington transistor with integrated active zener clamping, rated for 350 V_CEO, 10 A continuous collector current, and 150 W power dissipation in D2PAK package. It is designed for unclamped inductive switching in automotive electronic ignition systems, industrial motor control, and switching regulators requiring robust avalanche energy handling.

For engineers reviewing the NJVBUB323ZT4G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage window (350–450 V), tested repetitive clamp energy (200 mJ), SOA compliance at full temperature range (−40°C to +125°C), and AEC−Q101 qualification for automotive use.

Technical Context

The NJVBUB323ZT4G implements a planar monolithic Darlington structure with built-in active zener clamping circuitry that triggers at 350–450 V to prevent reverse-bias operating limit conditions during inductive turn-off. Its IC = f(VCE) curve exhibits a distinct shape due to coordinated avalanche diode and high-voltage driving circuit activation.

It guarantees operation within Forward Bias Safe Operating Area (FBSOA) across all conditions, with 100% live-circuit energy testing per Figure 2 (IC = 7.0 A, L = 8.0 mH, R_BE = 100 Ω) and thermal resistance R_JC = 1.0 °C/W enabling high-power pulse handling without derating at case temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	350 Vdc - Maximum sustaining voltage before breakdown under open-base condition; defines safe blocking capability in ignition and regulator applications.
I_C Continuous	10 Adc - Sustained collector current rating at T_C = 25°C; supports high-current motor drive and load switching without forced cooling.
V_CLAMP	350–450 Vdc - Guaranteed clamping window over −40°C to +125°C; ensures consistent overvoltage protection across automotive temperature extremes.
W_CLAMP	200 mJ - Repetitive non-destructive energy dissipated at turn-off (IC = 7.0 A, L = 8.0 mH); validated 100% in live ignition circuit per datasheet Figure 2.
R_JC	1.0 °C/W - Junction-to-case thermal resistance; enables direct heatsink mounting with minimal thermal interface resistance for high-power pulses.
h_FE	150–3400 - DC current gain range at I_C = 5–6.5 A and V_CE = 1.5–4.6 V; supports low-base-drive designs in high-gain switching configurations.
V_CE(sat)	1.6–2.1 Vdc - Saturation voltage at I_C = 8–10 A and I_B = 0.1–0.25 A; determines conduction loss and thermal rise in on-state operation.

Pinout & Package

D2PAK (TO-263-3L) package, Case 418B-04, surface-mount with exposed thermal pad. Pin configuration: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, Pin 4 = Collector (dual-collector configuration for current sharing and thermal distribution).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Base	Control input for Darlington pair; requires ≥100 mA peak drive for full saturation at 10 A collector current.
Pin 2	Collector	Main high-voltage current path; electrically tied to Pin 4 for parallel conduction and improved thermal spreading.
Pin 3	Emitter	Power return node; referenced for base drive and clamping circuit ground; must be low-inductance layout for fast switching.
Pin 4	Collector	Second collector terminal, internally connected to Pin 2; used for symmetric PCB layout and enhanced thermal coupling to heatsink.

Key Features

Feature	Design Value
Integrated active zener clamp	Eliminates need for external snubber networks in ignition coils and relay drivers, reducing BOM count and board space.
Tight clamping voltage window	350–450 V guaranteed over −40°C to +125°C ensures predictable turn-off stress in automotive environments without derating.
100% live-circuit energy test	Each unit verified at 200 mJ (IC = 7.0 A, L = 8.0 mH) in production, guaranteeing reliability in real-world inductive switching events.
AEC−Q101 qualified	Validated for automotive under-hood applications including engine control modules and transmission solenoid drivers.
FBSOA compliance	Guaranteed safe operation across entire voltage/current envelope without second-breakdown risk, even at elevated junction temperatures.

Applications

Automotive Electronic Ignition	Industrial Motor Control
Use Scenario: Driving primary winding of distributorless ignition coils in gasoline engines, where inductive kickback exceeds 300 V during spark generation. IC Role / Device Role / Timing Role: High-voltage switch with integrated clamping; replaces discrete transistor + external Zener + TVS stack. Use Value: Eliminates external clamping components while delivering 200 mJ repetitive energy handling, reducing system cost and improving long-term reliability under thermal cycling.	Use Scenario: Controlling brushed DC motors in factory automation systems, where back-EMF spikes occur during rapid deceleration or direction reversal. IC Role / Device Role / Timing Role: Power stage switch with self-protecting clamping; handles inductive transients without gate driver isolation or external suppression. Use Value: Enables compact, single-device motor driver design with guaranteed FBSOA operation up to +125°C ambient, reducing heatsink requirements.
Switching Regulator Output Stage	High-Voltage Relay Driver
Use Scenario: Primary-side switch in offline flyback or forward converters operating at 265 VAC input, where leakage inductance causes voltage overshoot during MOSFET turn-off. IC Role / Device Role / Timing Role: Clamped Darlington switch replacing MOSFET+clamp diode; provides higher current gain and lower gate drive complexity than high-voltage MOSFETs. Use Value: Reduces component count and improves efficiency at high duty cycles by minimizing V_CE(sat) vs. R_DS(on) trade-offs in 350 V-class topologies.	Use Scenario: Driving high-current electromagnetic relays in HVAC control panels, where coil de-energization generates >400 V transients. IC Role / Device Role / Timing Role: Solid-state replacement for mechanical relay contacts; provides zero-contact bounce, precise timing, and built-in transient suppression. Use Value: Extends relay lifetime and eliminates contact arcing failures, with clamping action preserving downstream logic-level controller integrity.

Automotive Electronic Ignition

Industrial Motor Control

Use Scenario: Driving primary winding of distributorless ignition coils in gasoline engines, where inductive kickback exceeds 300 V during spark generation.

IC Role / Device Role / Timing Role: High-voltage switch with integrated clamping; replaces discrete transistor + external Zener + TVS stack.

Use Value: Eliminates external clamping components while delivering 200 mJ repetitive energy handling, reducing system cost and improving long-term reliability under thermal cycling.

Use Scenario: Controlling brushed DC motors in factory automation systems, where back-EMF spikes occur during rapid deceleration or direction reversal.

IC Role / Device Role / Timing Role: Power stage switch with self-protecting clamping; handles inductive transients without gate driver isolation or external suppression.

Use Value: Enables compact, single-device motor driver design with guaranteed FBSOA operation up to +125°C ambient, reducing heatsink requirements.

Switching Regulator Output Stage

High-Voltage Relay Driver

Use Scenario: Primary-side switch in offline flyback or forward converters operating at 265 VAC input, where leakage inductance causes voltage overshoot during MOSFET turn-off.

IC Role / Device Role / Timing Role: Clamped Darlington switch replacing MOSFET+clamp diode; provides higher current gain and lower gate drive complexity than high-voltage MOSFETs.

Use Value: Reduces component count and improves efficiency at high duty cycles by minimizing V_CE(sat) vs. R_DS(on) trade-offs in 350 V-class topologies.

Use Scenario: Driving high-current electromagnetic relays in HVAC control panels, where coil de-energization generates >400 V transients.

IC Role / Device Role / Timing Role: Solid-state replacement for mechanical relay contacts; provides zero-contact bounce, precise timing, and built-in transient suppression.

Use Value: Extends relay lifetime and eliminates contact arcing failures, with clamping action preserving downstream logic-level controller integrity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage Darlington switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU931T	Higher V_CEO (1000 V), lower I_C (8 A), no integrated clamp; requires external Zener network.	Suitable for higher-voltage SMPS but lacks NJVBUB323ZT4G's tested 200 mJ clamp energy and AEC−Q101 qualification.	Select BU931T only when >450 V blocking is mandatory and external clamping is acceptable.
STGD10NB40LZ	400 V N-channel MOSFET with integrated freewheeling diode; no active clamping; R_DS(on) = 0.35 Ω typical.	Lower conduction loss at light loads but vulnerable to unclamped inductive spikes without external protection; not AEC−Q101 qualified.	Choose STGD10NB40LZ for efficiency-critical low-duty-cycle applications where external clamp design is feasible.

Compared with BU931T and STGD10NB40LZ, the NJVBUB323ZT4G uniquely combines AEC−Q101 qualification, guaranteed 350–450 V clamping, and 100% live-circuit 200 mJ energy validation-making it the only drop-in solution for automotive ignition and safety-critical industrial switching where external component reduction and production-tested ruggedness are mandatory.

Availability

NJVBUB323ZT4G is available at Aetrix Electronics and suitable for automotive electronic ignition systems, industrial motor controllers, and switching regulator output stages requiring stable component supply and long-term lifecycle support.

Supply support for NJVBUB323ZT4G 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 NJVBUB323ZT4G belongs to onsemi's Autoprotected Darlington family, engineered specifically for ruggedized inductive switching in harsh environments-emphasizing integrated protection, AEC−Q101 compliance, and production-validated energy handling.

FAQ

What is the clamping voltage range of the NJVBUB323ZT4G and how is it guaranteed?

The NJVBUB323ZT4G has a guaranteed clamping voltage range of 350 V to 450 V across the full operating temperature range of −40°C to +125°C. This specification is validated per the Electrical Characteristics table and confirmed by 100% production testing using the live ignition circuit described in Figures 2 and 4 of the datasheet. The clamping behavior results from its integrated active zener network, not external components, ensuring consistent performance without calibration or tolerance stacking.

Is the NJVBUB323ZT4G suitable for automotive applications and what qualifications does it hold?

Yes, the NJVBUB323ZT4G is explicitly qualified to AEC−Q101 for automotive use and supports PPAP documentation. The "NJV" prefix denotes automotive-grade manufacturing controls, unique site traceability, and extended reliability testing. It is designed for under-hood applications such as electronic ignition modules and transmission solenoid drivers where operation at +125°C junction temperature and resistance to thermal cycling are required.

How does the NJVBUB323ZT4G handle inductive turn-off energy, and is this tested per unit?

Each NJVBUB323ZT4G undergoes 100% production testing for repetitive non-destructive clamping energy of 200 mJ, measured under standardized conditions (IC = 7.0 A, L = 8.0 mH, R_BE = 100 Ω). This live-circuit validation ensures every device meets the minimum energy rating without degradation, directly supporting reliability in ignition coil and motor control applications where unclamped inductive spikes are routine.

What is the thermal performance of the NJVBUB323ZT4G in the D2PAK package?

The NJVBUB323ZT4G in D2PAK (Case 418B-04) delivers R_JC = 1.0 °C/W, enabling efficient heat transfer from junction to heatsink. With 150 W total power dissipation at T_C = 25°C and 1.0 W/°C derating above that, it supports high-pulse-power operation when mounted on a properly sized heatsink. The dual-collector pin configuration (Pins 2 and 4) further enhances thermal spreading and current sharing.

Does the NJVBUB323ZT4G require external base drive components, and what are the recommended drive conditions?

The NJVBUB323ZT4G requires a base drive capable of delivering ≥100 mA peak current to achieve full saturation at 10 A collector current. At I_C = 8 A, V_BE(sat) is specified ≤2.2 V; at I_C = 10 A, it rises to ≤2.5 V. A low-impedance, low-inductance base path is essential-especially in fast-switching applications-to minimize storage time (t_si = 10–30 μs) and ensure reliable turn-off. No external base resistor is mandated, but drive circuit design must account for h_FE variation (150–3400) across temperature and current.

NJVBUB323ZT4G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 350 V

Vce Saturation (Max) @ Ib, Ic:: 1.7V @ 250mA, 10A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 500 @ 5A, 4.6V

Power - Max:: 150 W

Frequency - Transition:: 2MHz

Operating Temperature:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

NJVBUB323ZT4G FAQ

1.How can I place an order for NJVBUB323ZT4G through Aetrix?

Please submit a Request for Quotation (RFQ) for NJVBUB323ZT4G 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 NJVBUB323ZT4G reliable?

The price and inventory of NJVBUB323ZT4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NJVBUB323ZT4G is usually 5 days.

3.What payment methods are accepted for NJVBUB323ZT4G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NJVBUB323ZT4G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NJVBUB323ZT4G?

NJVBUB323ZT4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NJVBUB323ZT4G 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 NJVBUB323ZT4G?

For technical support, including NJVBUB323ZT4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NJVBUB323ZT4G requirements.

6.How does Aetrix verify that NJVBUB323ZT4G is sourced from the original manufacturer or authorized distributors?

All NJVBUB323ZT4G 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 NJVBUB323ZT4G meets industry standards.

7.What is the process for return or replacement of NJVBUB323ZT4G?

All NJVBUB323ZT4G units undergo pre-shipment inspection (PSI). If there is an issue with NJVBUB323ZT4G, 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 NJVBUB323ZT4G part is unused and in its original packaging.

Return procedure for NJVBUB323ZT4G:

1.Submit a request within 90 days.

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

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