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

onsemi MJD42C

Name: MJD42C
Brand: onsemi
SKU: MJD42C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD42C

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MJD42C.pdf

Description:: TRANS PNP 100V 6A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJD42C from onsemi is a PNP silicon power transistor in DPAK (TO-252) package, rated for 100 V_CEO, 6 A continuous collector current, and 20 W power dissipation at T_C = 25°C, designed for low-speed switching and general-purpose amplifier applications in automotive and industrial power stages.

For engineers reviewing the MJD42C datasheet, pinout, applications, or equivalent options, key selection considerations include its AEC-Q101 qualification, complementary pairing with MJD41C, thermal resistance of 6.25°C/W (junction-to-case), and suitability for linear regulators, relay drivers, and DC motor control where robust PNP switching with 1.5 V_CE(sat) at 6 A is required.

Technical Context

The MJD42C operates as a medium-power PNP bipolar junction transistor with DC current gain (h_FE) ranging from 15 to 75 at I_C = 0.3–3 A, V_CE = 4 V. Its safe operating area (SOA) is defined up to 100 V and 6 A under DC conditions, with second-breakdown-limited pulse capability per Figure 12.

Thermal performance is characterized by R_JC = 6.25°C/W and R_JA = 71.4°C/W (on minimum recommended PCB pad), supporting surface-mount thermal management in compact power modules. It exhibits f_T = 3 MHz and h_fe ≥ 20 at 1 kHz, confirming suitability for audio-frequency amplification and slow-switching (<100 kHz) power control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - Maximum collector-emitter voltage before breakdown; enables use in 48 V and 72 V DC bus systems with margin.
I_C (continuous)	6 A - Sustained collector current rating; supports load switching up to ~72 W at 12 V with appropriate heatsinking.
P_D @ T_C = 25°C	20 W - Total power dissipation limit when case temperature is maintained at 25°C; requires thermal interface design.
V_CE(sat)	≤1.5 V @ I_C = 6 A, I_B = 600 mA - Low saturation voltage reduces conduction loss in high-current PNP emitter-follower or switch configurations.
h_FE	15–75 - Wide DC current gain range across operating current; allows flexible base drive design for varying load conditions.
R_JC	6.25 °C/W - Junction-to-case thermal resistance; defines minimum heatsink requirement for thermal stability at full power.
f_T	3 MHz - Transition frequency; confirms usable bandwidth for audio amplifiers and PWM frequencies below 100 kHz.

Pinout & Package

DPAK (TO-252-3) plastic surface-mount package, case 369C, with exposed drain tab (pin 2 and 4) electrically connected to collector; 6.10 mm × 6.54 mm footprint, 2.28 mm height, 2.29 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on.
2	Collector	Main current-carrying terminal tied to high-side rail in common-emitter configuration; thermally coupled to exposed tab.
3	Emitter	Reference terminal for base drive and load return; typically connected to positive supply in high-side switch topologies.
4	Collector	Second collector connection for enhanced current handling and thermal conduction; must be soldered to PCB copper pour.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM Class 3B); supports PPAP-compliant production.
Pb-free & RoHS compliant	Meets global environmental compliance requirements without lead-based solder compatibility compromises.
UL 94 V-0 epoxy	Flame-retardant encapsulation suitable for safety-critical industrial enclosures and transportation equipment.
Complementary to MJD41C	Enables balanced push-pull output stages with matched voltage/current ratings and thermal profiles.
Surface-mount optimized	Lead-formed DPAK variant supports automated assembly and high-density PCB layouts without through-hole drilling.

Applications

Linear Voltage Regulator	DC Motor Driver
Use Scenario: Medium-power series pass element in adjustable 3–24 V linear regulators delivering up to 5 A. IC Role / Device Role / Timing Role: PNP pass transistor controlling output voltage via base-emitter bias; operates in active region for precise regulation. Use Value: Low V_CE(sat) minimizes dropout voltage; high h_FE reduces base drive burden; AEC-Q101 rating supports automotive infotainment power supplies.	Use Scenario: High-side driver for brushed DC motors in HVAC actuators and seat positioners (12–24 V, ≤5 A). IC Role / Device Role / Timing Role: PNP switch enabling ground-referenced PWM control with emitter-follower topology. Use Value: 100 V_CEO withstands inductive kickback; 6 A rating handles stall currents; DPAK thermal performance sustains intermittent duty cycles.
Relay Driver Circuit	Power Supply OR-ing
Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial PLC I/O modules and building automation panels. IC Role / Device Role / Timing Role: Saturated PNP switch providing >100 mA coil current with minimal base drive overhead. Use Value: Guaranteed h_FE ≥15 ensures reliable turn-on with microcontroller GPIO; UL 94 V-0 housing meets panel fire safety standards.	Use Scenario: Diode-replacement OR-ing in redundant 12 V power supplies for telecom shelf controllers and network switches. IC Role / Device Role / Timing Role: PNP configured as active OR-ing switch to reduce forward voltage drop versus Schottky diodes. Use Value: V_CE(sat) ≤1.5 V cuts conduction loss by >50% vs. 0.4 V Schottky at 5 A; thermal derating supports continuous operation at 40°C ambient.

Linear Voltage Regulator

DC Motor Driver

Use Scenario: Medium-power series pass element in adjustable 3–24 V linear regulators delivering up to 5 A.

IC Role / Device Role / Timing Role: PNP pass transistor controlling output voltage via base-emitter bias; operates in active region for precise regulation.

Use Value: Low V_CE(sat) minimizes dropout voltage; high h_FE reduces base drive burden; AEC-Q101 rating supports automotive infotainment power supplies.

Use Scenario: High-side driver for brushed DC motors in HVAC actuators and seat positioners (12–24 V, ≤5 A).

IC Role / Device Role / Timing Role: PNP switch enabling ground-referenced PWM control with emitter-follower topology.

Use Value: 100 V_CEO withstands inductive kickback; 6 A rating handles stall currents; DPAK thermal performance sustains intermittent duty cycles.

Relay Driver Circuit

Power Supply OR-ing

Use Scenario: Driving 12 V/24 V electromagnetic relays in industrial PLC I/O modules and building automation panels.

IC Role / Device Role / Timing Role: Saturated PNP switch providing >100 mA coil current with minimal base drive overhead.

Use Value: Guaranteed h_FE ≥15 ensures reliable turn-on with microcontroller GPIO; UL 94 V-0 housing meets panel fire safety standards.

Use Scenario: Diode-replacement OR-ing in redundant 12 V power supplies for telecom shelf controllers and network switches.

IC Role / Device Role / Timing Role: PNP configured as active OR-ing switch to reduce forward voltage drop versus Schottky diodes.

Use Value: V_CE(sat) ≤1.5 V cuts conduction loss by >50% vs. 0.4 V Schottky at 5 A; thermal derating supports continuous operation at 40°C ambient.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP16PF06	PNP MOSFET (not BJT); V_DSS = 60 V, I_D = 16 A; gate-driven, no base current needed.	Higher efficiency at high frequency due to zero gate current; unsuitable for linear-mode operation.	Select when switching speed >100 kHz is required and linear regulation is not needed.
MJD42CT4G	Same die and specs; differs only in tape-and-reel packaging (2500 pcs/reel vs. rail-packaged MJD42C).	No functional difference; identical electrical, thermal, and mechanical behavior.	Choose MJD42CT4G for automated SMT line compatibility; MJD42C for prototyping or low-volume manual assembly.

Compared with STP16PF06 and MJD42CT4G, the MJD42C offers proven BJT linearity for analog control, lower gate-drive complexity than MOSFET alternatives, and direct compatibility with legacy TIP42-based designs-making it optimal for cost-sensitive, medium-speed, high-reliability PNP switching where thermal margin and automotive qualification are critical.

Availability

MJD42C is available at Aetrix Electronics and suitable for automotive body control modules, industrial relay drivers, and linear regulator designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for MJD42C 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MJD42C belongs to onsemi's complementary power transistor family engineered for rugged, surface-mount power control in automotive and industrial environments where reliability, thermal robustness, and regulatory compliance are mandatory.

FAQ

What is the maximum continuous collector current rating for the MJD42C?

The MJD42C has a maximum continuous collector current (I_C) rating of 6 A at T_C = 25°C. This rating assumes proper PCB thermal management using the minimum recommended copper pad area. At higher case temperatures, current must be derated per the 0.16 W/°C slope specified in the datasheet. The MJD42C maintains this rating across its full operating junction temperature range of −65°C to +150°C.

Is the MJD42C suitable for automotive applications?

Yes, the MJD42C is AEC-Q101 qualified and PPAP capable, with the NJV prefix variant (e.g., NJVMJD42CT4G*) explicitly designated for automotive use. It meets stringent reliability requirements including temperature cycling, high-temperature reverse bias, and human-body-model ESD (Class 3B). Its UL 94 V-0 epoxy and Pb-free construction further support compliance with automotive safety and environmental standards.

What package type does the MJD42C use, and how is it mounted?

The MJD42C uses the DPAK (TO-252-3) surface-mount package, case 369C, with dimensions 6.10 mm × 6.54 mm × 2.28 mm. It features an exposed collector tab (pins 2 and 4) that must be soldered directly to a large PCB copper pour for effective heat transfer. The device is lead-formed for tape-and-reel or rail packaging and is compatible with standard reflow soldering profiles for Pb-free assembly.

How does the MJD42C compare to the TIP42 transistor series?

The MJD42C is electrically similar to the TIP42 series but optimized for surface-mount applications. Both share comparable V_CEO = 100 V, I_C = 6 A, and P_D = 65 W (TIP42) vs. 20 W (MJD42C at T_C). The MJD42C's lower power rating reflects its DPAK thermal limits, while its smaller footprint, AEC-Q101 qualification, and Pb-free compliance make it preferable for modern automotive and space-constrained industrial designs over through-hole TIP42 variants.

What is the typical DC current gain (h_FE) of the MJD42C across its operating range?

The MJD42C specifies h_FE = 30–75 at I_C = 0.3 A and V_CE = 4 V, and h_FE = 15–75 at I_C = 3 A and V_CE = 4 V. This wide gain range accommodates diverse base drive strategies-from low-current bias networks to high-current saturated switching. Gain remains stable across the full −65°C to +150°C junction temperature range, supporting consistent performance in harsh thermal environments.

MJD42C Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

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):: 50µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 15 @ 3A, 4V

Power - Max:: 1.75 W

Frequency - Transition:: 3MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD42C FAQ

1.How can I place an order for MJD42C through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD42C 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 MJD42C reliable?

The price and inventory of MJD42C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD42C is usually 5 days.

3.What payment methods are accepted for MJD42C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD42C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD42C?

MJD42C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD42C 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 MJD42C?

For technical support, including MJD42C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD42C requirements.

6.How does Aetrix verify that MJD42C is sourced from the original manufacturer or authorized distributors?

All MJD42C 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 MJD42C meets industry standards.

7.What is the process for return or replacement of MJD42C?

All MJD42C units undergo pre-shipment inspection (PSI). If there is an issue with MJD42C, 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 MJD42C part is unused and in its original packaging.

Return procedure for MJD42C:

1.Submit a request within 90 days.

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

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