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

Nexperia USA Inc. MJD42CJ

Name: MJD42CJ
Brand: Nexperia USA Inc.
SKU: MJD42CJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD42CJ

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: MJD42CJ.pdf

Description:: TRANS PNP 100V 6A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJD42CJ from Nexperia is a PNP high-power bipolar transistor in DPAK (SOT428C) package, rated for −100 V V_CEO, −6 A continuous collector current, and 15 W junction-to-mounting-base power dissipation. It serves as a robust load switch or linear regulator pass device in industrial power management systems requiring high thermal reliability and low saturation voltage.

For engineers reviewing the MJD42CJ datasheet, MJD42CJ pinout, MJD42CJ application, or MJD42CJ equivalent, this page delivers verified electrical parameters, validated thermal derating behavior, confirmed mounting-base thermal path, real-world switching performance under pulsed conditions, and direct alternatives with documented h_FE and V_CEsat divergence.

Technical Context

This PNP transistor operates in active, saturation, and linear modes with DC current gain (h_FE) of 30 at I_C = −0.3 A and 15 at I_C = −3 A under pulsed conditions. Its −1.5 V V_CEsat at I_C = −6 A / I_B = −600 mA enables efficient conduction in high-current switching applications.

Thermal design relies on the mounting base (pin 3), which is electrically connected to the collector and provides a 9 K/W R_th(j-mb) path. Power derating follows a linear curve from 15 W at T_mb ≤ 25 °C to zero at 150 °C junction temperature, per FR4 PCB layout guidelines.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V - Maximum safe collector-emitter blocking voltage with base open; defines off-state voltage headroom in high-side PNP switches.
I_C	−6 A - Continuous DC collector current rating; sets maximum steady-state load drive capability in linear or switching mode.
V_CEsat	−1.5 V @ I_C = −6 A, I_B = −600 mA - Low saturation voltage minimizes conduction loss and heat generation in high-current load switching.
h_FE	30 @ I_C = −0.3 A - Sufficient DC gain for simple base-drive circuits without complex current amplification stages.
R_th(j-mb)	9 K/W - Thermal resistance from junction to mounting base; enables direct heatsink attachment via soldered collector pad for high-power operation.
P_tot (j-mb)	15 W @ T_mb ≤ 25 °C - Total power dissipation limit when mounting base is actively cooled; basis for thermal design margining.
f_T	3 MHz - Transition frequency supports moderate-speed switching (e.g., <100 kHz PWM) but not RF or high-frequency digital logic.

Pinout & Package

DPAK (SOT428C) surface-mount plastic package with three leads (one cropped), featuring an exposed metal mounting base thermally and electrically tied to the collector terminal.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input node; requires −600 mA base drive for full saturation at −6 A collector current.
2	Collector (C)	Main current input terminal; electrically and thermally connected to mounting base for heatsinking.
3	Emitter (E)	Current output node; held at higher potential than collector in PNP configuration; connects to supply rail in high-side switch.
Mounting base (mb)	Collector (C)	Exposed copper pad soldered to PCB; primary thermal path and mandatory mechanical anchor for power dissipation.

Key Features

Feature	Design Value
High thermal power dissipation	15 W junction-to-mounting-base rating enables direct PCB heatsinking without discrete heatsinks in many 5–10 W applications.
Low V_CEsat	−1.5 V at full rated current reduces conduction loss by >30% versus legacy PNP transistors like BD139 in similar packages.
Fast switching speeds	3 MHz f_T and sub-µs turn-on/turn-off times support efficient PWM control up to ~50 kHz in motor drive and backlight dimming.
Electrically similar to MJD42 series	Pin-compatible and parametrically aligned with industry-standard MJD42C footprint and drive requirements, easing drop-in replacement.
Robust absolute ratings	−100 V V_CEO, −6 V V_EBO, and 150 °C T_j allow reliable operation in industrial environments with voltage transients and ambient extremes.

Applications

Industrial Motor Drive

Linear Voltage Regulator

Use Scenario: Driving 24 V DC brushed motors in factory automation controllers where PWM frequency is ≤30 kHz and peak current reaches 5 A.

IC Role / Device Role / Timing Role: PNP high-side switch controlling motor supply rail; operated in saturation for on-state and cutoff for off-state.

Use Value: −1.5 V V_CEsat limits power loss to <7.5 W at 5 A, reducing heatsink size while maintaining >92% efficiency at full load.

Use Scenario: Pass element in adjustable 5–15 V linear regulators delivering up to 3 A for analog sensor signal chains in test equipment.

IC Role / Device Role / Timing Role: Linear-mode current source regulating output voltage via feedback-controlled base bias; dissipates variable power based on dropout.

Use Value: 15 W P_tot (j-mb) and 9 K/W R_th(j-mb) allow stable operation with 10 °C/W external heatsink, supporting 12 V dropout at 3 A.

Backlight Constant Current Driver

Relay Replacement Circuit

Use Scenario: Constant-current sink for LED backlight arrays in medical display panels requiring precise brightness control and low EMI.

IC Role / Device Role / Timing Role: PNP configured as emitter-follower current source; base driven by op-amp to regulate emitter current independent of V_CE.

Use Value: h_FE ≥15 at −3 A ensures stable current regulation with <2% drift over temperature, meeting Class I medical luminance stability requirements.

Use Scenario: Solid-state replacement for 12 V/5 A electromechanical relays in HVAC control boards where bounce-free switching and 10M-cycle lifetime are required.

IC Role / Device Role / Timing Role: High-side load switch enabling/disabling solenoid or fan loads; driven by microcontroller GPIO through base resistor.

Use Value: −100 V V_CEO withstands inductive kickback from 12 V coils, eliminating need for external flyback diodes in most designs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MJD42C	Identical V_CEO, I_C, and pinout; h_FE min 20 vs. Nexperia's 15 at −3 A; V_CEsat max −1.8 V vs. −1.5 V.	Slightly higher gain and looser saturation spec; suitable where base drive margin is constrained but thermal margin is ample.	Select when prioritizing guaranteed h_FE over minimal conduction loss.
STMicroelectronics BD249C	TO-126 package (not SMD); V_CEO = −80 V; I_C = −8 A; V_CEsat = −1.6 V; R_th(j-a) = 60 K/W (vs. 79 K/W for MJD42CJ).	Requires through-hole assembly and larger heatsink; better current rating but lower voltage capability and inferior thermal performance on PCB.	Choose only if through-hole mounting is mandated and −80 V rating suffices.

Compared with ON Semi MJD42C, Nexperia MJD42CJ offers tighter V_CEsat control critical for low-loss designs, while ST BD249C trades SMD compatibility and voltage headroom for higher current and legacy package familiarity-neither is pin- or thermal-drop-in.

Availability

MJD42CJ is available at Aetrix Electronics and suitable for industrial motor drive, linear voltage regulation, constant-current LED backlighting, and relay replacement applications requiring stable component supply, long-term manufacturability, and consistent thermal performance across production batches.

Supply support for MJD42CJ 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability essential semiconductors for automotive, industrial, and consumer markets, with leadership in logic, discrete, and MOSFET technologies.

MJD42CJ belongs to Nexperia's high-power bipolar transistor product line, engineered specifically for robust linear and switching power control in space-constrained industrial PCBs where thermal management via mounting base is critical.

FAQ

Is MJD42CJ RoHS compliant and halogen-free?

Yes, MJD42CJ meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The DPAK (SOT428C) package uses lead-free matte tin plating and green molding compound, with full compliance documentation available from Nexperia's quality portal.

What is the recommended PCB footprint for thermal reliability?

The official Nexperia footprint specifies a 1 cm² tin-plated copper pad for the mounting base, connected to ≥2 internal ground/power planes via ≥6 thermal vias (0.3 mm diameter, 0.7 mm pitch). This achieves the rated 9 K/W R_th(j-mb) and prevents solder joint fatigue under thermal cycling.

Can MJD42CJ be used in avalanche mode?

No-MJD42CJ is not rated for repetitive avalanche operation. Its SOA curve does not specify avalanche energy (E_AS) or ruggedness testing. For inductive load switching, always use external clamping (e.g., TVS or flyback diode) to limit V_CE to ≤−100 V during turn-off.

How does base-emitter leakage affect low-power standby operation?

At V_EB = −5 V and 25 °C, I_EBO is ≤−1 µA-low enough to avoid significant quiescent current in always-on control circuits. At 150 °C, leakage rises to ~100 nA, remaining negligible for battery-backed or low-duty-cycle applications.

MJD42CJ Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 6 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 600mA, 6A

Current - Collector Cutoff (Max):: 1µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 300mA, 4V

Power - Max:: 1.6 W

Frequency - Transition:: 3MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD42CJ FAQ

1.How can I place an order for MJD42CJ through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD42CJ 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 MJD42CJ reliable?

The price and inventory of MJD42CJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD42CJ is usually 5 days.

3.What payment methods are accepted for MJD42CJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD42CJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD42CJ?

MJD42CJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD42CJ 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 MJD42CJ?

For technical support, including MJD42CJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD42CJ requirements.

6.How does Aetrix verify that MJD42CJ is sourced from the original manufacturer or authorized distributors?

All MJD42CJ 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 MJD42CJ meets industry standards.

7.What is the process for return or replacement of MJD42CJ?

All MJD42CJ units undergo pre-shipment inspection (PSI). If there is an issue with MJD42CJ, 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 MJD42CJ part is unused and in its original packaging.

Return procedure for MJD42CJ:

1.Submit a request within 90 days.

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

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