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

onsemi MJK32CTWG

Name: MJK32CTWG
Brand: onsemi
SKU: MJK32CTWG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJK32CTWG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SOT-1023, 4-LFPAK

Datasheet:: MJK32CTWG.pdf

Description:: TRANS PNP 100V 3A LFPAK4

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJK32CTWG from onsemi is a PNP bipolar junction transistor rated for −100 V V_CEO, −3 A continuous collector current, and optimized for automotive power switching in airbag deployment, powertrain control units, and instrument clusters. It uses an LFPAK4 (5 × 6 mm) package with R_θJC = 2.4 °C/W and is AEC−Q101 qualified.

For engineers reviewing the MJK32CTWG datasheet, pinout, applications, or equivalent options, key selection criteria include its −100 V breakdown voltage, −3 A DC current capability, low V_CE(sat) ≤ −1.2 V at −3 A/−0.375 A drive, AEC−Q101 qualification, and LFPAK4 thermal performance in space-constrained automotive modules.

Technical Context

This PNP transistor operates as a high-voltage, medium-current switch in linear and saturated modes. Its h_FE ranges from 10 to 60 at −1 A and −3 A respectively, supporting robust base-driven switching in safety-critical automotive subsystems.

Designed for surface-mount use on FR4 with a 6 cm², 2 oz. Cu collector pad, it delivers 2.7 W total power dissipation at T_A = 25°C and exhibits f_T = 3 MHz - sufficient for DC–low-frequency switching up to ~100 kHz with stable gain.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V - Withstands reverse collector-emitter voltage up to 100 V in blocking state, suitable for 42 V automotive systems with transient margin.
I_C (cont.)	−3 A - Supports sustained load currents up to 3 A in power regulators and solenoid drivers without derating at 25°C ambient.
V_CE(sat)	≤ −1.2 V @ −3 A/−0.375 A - Minimizes conduction loss and heat generation in high-duty-cycle switching applications.
R_θJC	2.4 °C/W - Enables efficient heat transfer from die to PCB copper pad, critical for thermal reliability in sealed automotive enclosures.
h_FE	10–60 - Provides predictable base current scaling across operating range, simplifying gate driver design for discrete BJT control stages.
f_T	3 MHz - Supports stable amplification and switching up to ~100 kHz, appropriate for PWM-controlled DC-DC converters and motor commutation.

Pinout & Package

Package: LFPAK4 (Case 760AB), 5 × 6 mm surface-mount, 4-terminal configuration with exposed drain pad (pin 4) for thermal and electrical connection.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Main current exit path; connected to system ground or low-side return in high-side switch configurations.
2	Base	Control input requiring −0.375 A drive for full saturation at −3 A collector current.
3	Collector	High-voltage input node; handles −100 V potential and carries switched load current to emitter.
4	Exposed Pad (Drain)	Thermally and electrically tied to collector; must be soldered to ≥6 cm² 2 oz. Cu pad for rated R_θJC and power handling.

Key Features

Feature	Design Value
AEC−Q101 qualified	Validated for automotive underhood environments including temperature cycling, humidity, and mechanical shock per JESD22 standards.
LFPAK4 thermal performance	2.4 °C/W junction-to-case resistance enables 2.7 W operation on standard FR4 - 3× better than TO-220 equivalents at same footprint.
Pb-free, halogen-free, RoHS compliant	Meets global environmental compliance requirements for automotive OEM supply chains without compromising solderability or long-term reliability.
Complementary NPN pairing	Direct counterpart MJK31C allows matched push-pull or H-bridge designs with consistent thermal and switching characteristics.

Applications

Airbag Deployment Circuit	Powertrain Control Unit (PCU)
Use Scenario: High-reliability triggering of pyrotechnic squibs during crash events, requiring fail-safe turn-on within microseconds. IC Role / Device Role / Timing Role: PNP switch controlling primary squib current path; biased into saturation by microcontroller GPIO via current-limiting resistor. Use Value: −100 V V_CEO withstands battery transients; −1.2 V V_CE(sat) minimizes energy loss during critical 1–2 ms pulse, preserving squib integrity.	Use Scenario: Driving fuel injector solenoids or throttle actuator coils in 12 V/42 V hybrid architectures. IC Role / Device Role / Timing Role: High-side switch managing coil energization/de-energization cycles synchronized to engine timing signals. Use Value: AEC−Q101 qualification ensures operation across −40°C to +150°C; 2.4 °C/W R_θJC sustains repetitive 10–50 Hz switching without thermal runaway.
Instrument Cluster Backlight Driver	DC-DC Converter Primary Switch
Use Scenario: Regulating LED backlight current in digital dashboards with variable brightness and EMI constraints. IC Role / Device Role / Timing Role: Linear or PWM-controlled current sink for white LED strings, operating in active region or saturation depending on dimming mode. Use Value: h_FE stability (10–60) over −1 A to −3 A enables precise analog current regulation; LFPAK4 footprint reduces board area vs. TO-252.	Use Scenario: High-efficiency buck converter stage converting 48 V battery to 12 V for auxiliary systems in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Synchronous rectifier or main switching transistor in non-isolated step-down topology, driven by dedicated gate controller. Use Value: 3 MHz f_T supports clean square-wave switching at 100 kHz; −3 A I_C rating accommodates peak inductor current in 150 W output designs.

Airbag Deployment Circuit

Powertrain Control Unit (PCU)

Use Scenario: High-reliability triggering of pyrotechnic squibs during crash events, requiring fail-safe turn-on within microseconds.

IC Role / Device Role / Timing Role: PNP switch controlling primary squib current path; biased into saturation by microcontroller GPIO via current-limiting resistor.

Use Value: −100 V V_CEO withstands battery transients; −1.2 V V_CE(sat) minimizes energy loss during critical 1–2 ms pulse, preserving squib integrity.

Use Scenario: Driving fuel injector solenoids or throttle actuator coils in 12 V/42 V hybrid architectures.

IC Role / Device Role / Timing Role: High-side switch managing coil energization/de-energization cycles synchronized to engine timing signals.

Use Value: AEC−Q101 qualification ensures operation across −40°C to +150°C; 2.4 °C/W R_θJC sustains repetitive 10–50 Hz switching without thermal runaway.

Instrument Cluster Backlight Driver

DC-DC Converter Primary Switch

Use Scenario: Regulating LED backlight current in digital dashboards with variable brightness and EMI constraints.

IC Role / Device Role / Timing Role: Linear or PWM-controlled current sink for white LED strings, operating in active region or saturation depending on dimming mode.

Use Value: h_FE stability (10–60) over −1 A to −3 A enables precise analog current regulation; LFPAK4 footprint reduces board area vs. TO-252.

Use Scenario: High-efficiency buck converter stage converting 48 V battery to 12 V for auxiliary systems in mild-hybrid vehicles.

IC Role / Device Role / Timing Role: Synchronous rectifier or main switching transistor in non-isolated step-down topology, driven by dedicated gate controller.

Use Value: 3 MHz f_T supports clean square-wave switching at 100 kHz; −3 A I_C rating accommodates peak inductor current in 150 W output designs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP10P6F6	−60 V V_CEO, −10 A I_C, TO-220 package, higher R_θJA (60 °C/W)	Higher current but lower voltage rating; unsuitable for 42 V+ transient environments	Select only if system max V_CE stays below 60 V and thermal mass permits TO-220 mounting.
MJD32C	−100 V V_CEO, −3 A I_C, TO-252 package, R_θJC = 3.5 °C/W, no AEC−Q101 certification	Same voltage/current specs but lacks automotive qualification and has inferior thermal resistance	Acceptable for industrial non-automotive use where AEC−Q101 and LFPAK4 thermal density are not required.

Compared with STP10P6F6 and MJD32C, the MJK32CTWG uniquely combines AEC−Q101 qualification, −100 V rating, and 2.4 °C/W thermal resistance in a 5 × 6 mm footprint - making it the only option qualified for safety-critical automotive switching where space, reliability, and transient immunity are jointly constrained.

Availability

MJK32CTWG is available at Aetrix Electronics and suitable for airbag deployment circuits, powertrain control units, and instrument cluster backlight drivers requiring stable component supply across automotive production lifecycles.

Supply support for MJK32CTWG 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 is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications, with leadership in power management and signal processing.

The MJK32CTWG belongs to onsemi's automotive-qualified discrete power transistor family, engineered specifically for high-reliability, thermally demanding switching in safety-critical vehicle subsystems.

FAQ

What is the maximum continuous collector current rating for the MJK32CTWG?

The MJK32CTWG is rated for −3 A continuous collector current at T_A = 25°C with proper PCB thermal management (6 cm², 2 oz. Cu pad). Derating is required above 25°C ambient per Figure 8 in the datasheet; at 100°C case temperature, usable current drops to approximately −1.5 A. This rating applies strictly to the MJK32CTWG in its specified LFPAK4 package.

Is the MJK32CTWG qualified for automotive applications?

Yes, the MJK32CTWG is AEC−Q101 qualified and PPAP capable, with NJV prefix indicating automotive-specific process controls and traceability. It meets stress testing requirements for temperature cycling, humidity, and mechanical shock per JESD22 standards - confirming suitability for airbag, powertrain, and instrument cluster use. The MJK32CTWG datasheet explicitly states this qualification.

What package type does the MJK32CTWG use, and why is it significant?

The MJK32CTWG uses the LFPAK4 (Case 760AB) package - a 5 × 6 mm surface-mount outline with an exposed collector pad. Its significance lies in R_θJC = 2.4 °C/W, enabling 2.7 W power dissipation on standard FR4 - nearly 3× better thermal performance than TO-252 equivalents. This makes the MJK32CTWG ideal for compact, high-power-density automotive modules where thermal headroom is limited.

Does the MJK32CTWG have a complementary NPN transistor?

Yes, the MJK32CTWG has a direct complementary NPN counterpart: the MJK31C. Both share identical LFPAK4 packaging, AEC−Q101 qualification, −100 V rating, and matched thermal and electrical characteristics - enabling balanced push-pull, H-bridge, or differential amplifier designs. This pairing is explicitly documented in the MJK32C/D datasheet under "Features".

What is the typical DC current gain (h_FE) of the MJK32CTWG at different operating points?

The MJK32CTWG exhibits h_FE = 25 (typical) at V_CE = −4 V and I_C = −1 A, and h_FE = 10 (minimum) at the same V_CE with I_C = −3 A. These values are confirmed in the Electrical Characteristics table on page 2 of the official datasheet. Designers must account for this gain compression at full load when sizing base drive for the MJK32CTWG.

MJK32CTWG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOT-1023, 4-LFPAK

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 3 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 1.2V @ 375mA, 3A

Current - Collector Cutoff (Max):: 50µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 25 @ 1A, 4V

Power - Max:: 2.7 W

Frequency - Transition:: 3MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: LFPAK4 (5x6)

MJK32CTWG FAQ

1.How can I place an order for MJK32CTWG through Aetrix?

Please submit a Request for Quotation (RFQ) for MJK32CTWG 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 MJK32CTWG reliable?

The price and inventory of MJK32CTWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJK32CTWG is usually 5 days.

3.What payment methods are accepted for MJK32CTWG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJK32CTWG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJK32CTWG?

MJK32CTWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJK32CTWG 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 MJK32CTWG?

For technical support, including MJK32CTWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJK32CTWG requirements.

6.How does Aetrix verify that MJK32CTWG is sourced from the original manufacturer or authorized distributors?

All MJK32CTWG 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 MJK32CTWG meets industry standards.

7.What is the process for return or replacement of MJK32CTWG?

All MJK32CTWG units undergo pre-shipment inspection (PSI). If there is an issue with MJK32CTWG, 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 MJK32CTWG part is unused and in its original packaging.

Return procedure for MJK32CTWG:

1.Submit a request within 90 days.

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

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