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

Nexperia USA Inc. MJD32CJ

Name: MJD32CJ
Brand: Nexperia USA Inc.
SKU: MJD32CJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD32CJ

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

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

Datasheet:: MJD32CJ.pdf

Description:: TRANS PNP 100V 3A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJD32CJ from Nexperia is a PNP high-power bipolar transistor in DPAK (SOT428C) package, rated for −100 V V_CEO, −3 A I_C, and 15 W P_tot (junction-to-mounting base), with low V_CEsat of −1.2 V at −3 A/−375 mA drive, used in linear-mode voltage regulators and motor drive circuits.

For engineers reviewing the MJD32CJ datasheet, MJD32CJ pinout, MJD32CJ application, or MJD32CJ equivalent, this page delivers verified electrical parameters, thermal resistance values (R_th(j-mb) = 9 K/W), DC current gain range (h_FE = 10–50), and mounting-base-connected collector configuration critical for thermal design and load-switch layout.

Technical Context

The MJD32CJ operates as a medium-power PNP switching and linear amplifier device, with base-emitter turn-on voltage of −1.8 V at −3 mA and transition frequency f_T of 3 MHz at −500 mA/−10 V. Its thermal design relies on direct mounting-base conduction, where the collector is internally bonded to the metal mounting base (Pin 2 + mb).

It supports fast switching due to low stored charge and exhibits stable h_FE across temperature (−55 °C to 150 °C), with typical V_CEsat ≤ −1.2 V under saturated drive (I_C/I_B = 8), enabling efficient operation in constant-current backlight drivers and relay-replacement circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V - Maximum reverse-biased collector-emitter voltage before breakdown; defines safe operating voltage headroom in high-side switch designs.
I_C	−3 A - Continuous DC collector current rating; sets maximum steady-state load current capability in linear regulators and motor drivers.
V_CEsat	−1.2 V @ I_C = −3 A, I_B = −375 mA - Low saturation voltage minimizes power loss and heat generation in on-state switching applications.
h_FE	10–50 @ V_CE = −4 V, I_C = −3 A - DC current gain range determines required base drive current for reliable saturation in power control circuits.
R_th(j-mb)	9 K/W - Thermal resistance from junction to mounting base; enables direct heatsink attachment for 15 W dissipation without PCB copper plane dependency.
f_T	3 MHz @ V_CE = −10 V, I_C = −500 mA - Transition frequency confirms suitability for low-to-moderate speed switching (e.g., <100 kHz PWM).

Pinout & Package

DPAK (SOT428C) surface-mount plastic package with exposed metal mounting base electrically connected to the collector terminal. Package dimensions: 6.47 mm × 4.45 mm × 2.55 mm (L × W × H), with 3 leads (lead 1 cropped per standard DPAK configuration).

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control input node; requires ≥375 mA sink current to saturate at −3 A collector load.
2	Collector (C)	Main power output node; internally bonded to mounting base (mb) for low-impedance thermal and electrical path to heatsink.
3	Emiter (E)	Power return node; connects to system ground or positive rail in high-side configurations.
mb	Mounting Base	Electrically tied to Pin 2 (collector); must be soldered to thermal pad for rated 15 W power dissipation.

Key Features

Feature	Design Value
High thermal power dissipation	15 W via mounting base (R_th(j-mb) = 9 K/W), enabling compact heatsink integration without large PCB copper areas.
Low V_CEsat	−1.2 V at full −3 A load reduces conduction loss to 3.6 W, improving efficiency in linear-mode regulators and constant-current drivers.
Fast switching speed	3 MHz f_T and low storage time support ≤100 kHz PWM operation in motor control and backlight dimming.
Electrically similar to MJD32 series	Pin-compatible and parameter-matched replacement for legacy MJD32C designs, ensuring drop-in compatibility in existing layouts.

Applications

Power Management

Load Switch

Use Scenario: High-side power switch in 24 V industrial control modules requiring >2 A continuous current and thermal robustness.

IC Role / Device Role / Timing Role: PNP transistor configured as emitter-follower high-side switch, controlled by microcontroller GPIO through base resistor network.

Use Value: −100 V V_CEO provides margin against inductive kickback; mounting-base thermal path sustains 15 W dissipation during overload conditions.

Use Scenario: Solid-state replacement for electromechanical relays in HVAC fan control units.

IC Role / Device Role / Timing Role: Main power switching element turning on/off 12–24 V DC loads up to 3 A, driven by optocoupler-isolated base signal.

Use Value: −1.2 V V_CEsat limits resistive heating during sustained on-state, eliminating coil wear and contact arcing failures.

Linear Mode Voltage Regulator

Constant Current Drive Backlighting

Use Scenario: Pass transistor in adjustable 5–15 V linear regulator supplying analog sensor circuitry.

IC Role / Device Role / Timing Role: Series pass element dissipating excess voltage between unregulated input and regulated output, biased in active region.

Use Value: Stable h_FE (10–50) across −55 °C to 150 °C ensures predictable base drive requirements over temperature; low V_CEsat not applicable but low V_BE (−1.8 V) simplifies bias design.

Use Scenario: Constant-current source for LED backlight strings in industrial HMIs with 12 V supply.

IC Role / Device Role / Timing Role: Current-regulating transistor in emitter-degenerated configuration, with sense resistor and op-amp feedback loop.

Use Value: Tight h_FE tolerance and low V_BE drift ensure ±3% current accuracy across operating temperature range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MJD32C	Identical V_CEO (−100 V), I_C (−3 A), and SOT428C package; h_FE min 20 vs. Nexperia's 10, slightly higher V_CEsat (−1.3 V).	Higher minimum h_FE eases base drive design in low-gain-critical circuits; otherwise functionally interchangeable in relay replacement and motor drive.	Select when guaranteed minimum current gain >20 is required for marginal drive conditions.
STMicroelectronics BD139	TO-126 package (not SMT), lower V_CEO (−80 V), same I_C (−1.5 A continuous, −3 A peak), no mounting base thermal path.	Requires through-hole PCB layout and external heatsink; unsuitable for space-constrained SMT designs or >1.5 A continuous loads.	Choose only for legacy through-hole systems where board rework is impractical and voltage stress remains <80 V.

Compared with ON Semi MJD32C and ST BD139, the Nexperia MJD32CJ offers superior thermal performance via mounting-base conduction (15 W vs. ~1.2 W for BD139), tighter V_CEsat control, and full SMT compatibility-making it optimal for modern high-density industrial power stages.

Availability

MJD32CJ is available at Aetrix Electronics and suitable for power management, load switching, and linear-mode voltage regulator applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEMs.

Supply support for MJD32CJ 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 leading Dutch semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, with global manufacturing and R&D centers focused on automotive-qualified and industrial-grade components.

The MJD32CJ belongs to Nexperia's high-power bipolar transistor product line, engineered for robust thermal performance and stable gain in industrial power control, motor drive, and solid-state relay replacement applications.

FAQ

What is the maximum continuous power dissipation for MJD32CJ under standard PCB mounting?

The MJD32CJ delivers 1.6 W total power dissipation when mounted on an FR4 PCB with single-sided copper and a 1 cm² tin-plated collector pad. This value assumes ambient temperature ≤25 °C and reflects convection-limited cooling-not the full 15 W capability enabled by direct mounting-base heatsinking.

Is the mounting base (mb) electrically isolated from the collector pin?

No-the mounting base is internally connected to Pin 2 (collector) and must be treated as a live high-current node. It is not insulated; therefore, mechanical isolation (e.g., mica washer) is required when attaching to grounded heatsinks to prevent short circuits.

Can MJD32CJ replace MJD31C in circuit designs?

No-MJD31C is the NPN complement to MJD32CJ and has opposite polarity, different pinout (emitter/base/collector sequence), and forward-biased characteristics. Swapping them would reverse current flow and likely cause circuit failure or damage.

What is the recommended base resistor value for switching a 3 A load at 5 V MCU logic level?

With V_BE ≈ −1.8 V and required I_B = −375 mA for saturation at I_C = −3 A, a 5 V MCU driving the base through a resistor needs R_B = (5 V − 1.8 V) / 0.375 A ≈ 8.5 Ω. Use a 8.2 Ω, 2 W resistor with adequate derating for reliability.

MJD32CJ 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):: 3 A

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

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

Current - Collector Cutoff (Max):: 1µA

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

Power - Max:: 1.6 W

Frequency - Transition:: 3MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD32CJ FAQ

1.How can I place an order for MJD32CJ through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD32CJ 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 MJD32CJ reliable?

The price and inventory of MJD32CJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD32CJ is usually 5 days.

3.What payment methods are accepted for MJD32CJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD32CJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD32CJ?

MJD32CJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD32CJ 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 MJD32CJ?

For technical support, including MJD32CJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD32CJ requirements.

6.How does Aetrix verify that MJD32CJ is sourced from the original manufacturer or authorized distributors?

All MJD32CJ 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 MJD32CJ meets industry standards.

7.What is the process for return or replacement of MJD32CJ?

All MJD32CJ units undergo pre-shipment inspection (PSI). If there is an issue with MJD32CJ, 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 MJD32CJ part is unused and in its original packaging.

Return procedure for MJD32CJ:

1.Submit a request within 90 days.

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

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