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

STMicroelectronics MJD32CT4-A

Name: MJD32CT4-A
Brand: STMicroelectronics
SKU: MJD32CT4-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJD32CT4-A

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: MJD32CT4-A.pdf

Description:: TRANS PNP 100V 3A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJD32CT4-A from STMicroelectronics is an AEC-Q101-qualified surface-mount PNP power transistor in DPAK (TO-252) package, designed for linear and switching applications requiring high DC current gain (h_FE ≥ 25 at I_C = −1 A), low saturation voltage (V_CE(sat) ≤ −1.2 V at I_C = −3 A / I_B = −375 mA), and robust thermal performance (R_thJC = 8.3 °C/W). It serves as a complementary device to the NPN MJD31CT4-A in automotive power stages and industrial motor drivers.

For engineers reviewing the MJD32CT4-A datasheet, MJD32CT4-A pinout, MJD32CT4-A application, or MJD32CT4-A equivalent, this part supports design of high-reliability, low-V_CE(sat) PNP switching circuits in automotive body control modules, DC-DC converter output stages, and industrial relay drivers where junction temperature stability up to 150 °C and −100 V collector-emitter sustaining voltage are critical.

Technical Context

This planar silicon transistor uses a "base island" layout to achieve exceptional h_FE linearity and minimal V_CE(sat) across its −3 A continuous collector current range. Its −100 V V_CEO and −100 V V_CBO ratings support operation in 48 V and 24 V automotive systems with transient overvoltage margin.

The DPAK package enables direct heatsinking via the exposed collector tab (Pin 2/TAB), delivering 15 W total power dissipation at T_C = 25 °C. Thermal resistance from junction-to-case is fixed at 8.3 °C/W, making it suitable for thermally constrained PCB layouts with limited copper area.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V - Supports safe operation in 48 V automotive supply rails with ISO 7637-2 pulse immunity margin.
I_C (continuous)	−3 A - Enables direct drive of medium-power loads such as solenoids, fans, and LED arrays without external current boosting.
V_CE(sat)	≤ −1.2 V @ I_C = −3 A / I_B = −375 mA - Minimizes conduction loss and self-heating in high-duty-cycle switching.
h_FE	25–50 @ I_C = −1 to −3 A - Ensures stable base drive requirements across operating current range for predictable biasing.
R_thJC	8.3 °C/W - Allows precise junction temperature estimation when mounted on heatsinked PCB copper or metal-core board.
T_J max	150 °C - Qualified for under-hood automotive environments per AEC-Q101 stress test conditions.

Pinout & Package

Package: DPAK (TO-252), surface-mount, single-ended heat sinkable package with exposed collector tab (Pin 2/TAB). Dimensions conform to ST's SC07710_TAB mechanical outline (A = 2.2–2.4 mm, D = 6.0–6.2 mm, E = 6.4–6.6 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	Low-impedance control input; requires −375 mA base drive for full saturation at −3 A collector current.
2 (TAB/C)	Collector (exposed metal tab)	Primary heat path to PCB copper or heatsink; electrically connected to collector; must be isolated from other potentials.
3 (E)	Emitter	High-current return node; tied to system ground or positive rail depending on PNP configuration in high-side switch topology.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including temperature cycling, HTRB, and ESD testing per Rev G requirements.
Low V_CE(sat)	Reduces power loss by >30% vs. standard PNP transistors at −3 A, lowering thermal stress in compact enclosures.
High h_FE consistency	Typical gain spread of 25–50 across −1 A to −3 A ensures stable base resistor selection without trimming.
DPAK tape-and-reel packaging	2500-unit reels compatible with automated SMT placement; footprint matches JEDEC TO-252 standard for process scalability.

Applications

Automotive Body Control Module

Industrial DC-DC Converter Output Stage

Use Scenario: Driving 12 V/24 V solenoid valves and window lift motors in BCMs with PWM-controlled current limiting.

IC Role / Device Role / Timing Role: High-side PNP switch controlling load current path between battery rail and ground.

Use Value: −100 V V_CEO withstands load dump transients; low V_CE(sat) reduces thermal derating in sealed modules.

Use Scenario: Synchronous rectification or pre-regulator switching in isolated 48 V → 12 V buck converters.

IC Role / Device Role / Timing Role: Complementary PNP switch paired with NPN MJD31CT4-A in totem-pole output stage.

Use Value: Matched h_FE and V_CE(sat) enable balanced current sharing and reduced cross-conduction losses.

LED Driver for Commercial Lighting

Industrial Relay Driver Circuit

Use Scenario: Constant-current dimming of high-brightness LED strings in parking garage lighting fixtures.

IC Role / Device Role / Timing Role: Linear-mode current regulator with emitter-follower configuration and analog dimming input.

Use Value: High h_FE allows microamp-level control current; low V_CE(sat) preserves headroom for wide LED forward voltage range.

Use Scenario: Solid-state replacement of electromechanical relays in PLC I/O modules driving 24 V DC coils.

IC Role / Device Role / Timing Role: High-reliability, fast-turn-off PNP switch interfacing microcontroller GPIO to inductive load.

Use Value: −50 μA ICEO ensures zero leakage hold-off; 15 W power rating supports 100% duty cycle coil energization.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MJD32C	Same DPAK package, identical pinout, but not AEC-Q101 qualified; h_FE min = 20 (vs. 25), R_thJC = 9.0 °C/W.	Limited to industrial/non-automotive use; lower gain may require larger base drive circuitry.	Select when AEC-Q101 compliance is unnecessary and cost sensitivity outweighs thermal margin.
Diodes Incorporated DXT32C	Higher V_CEO = −120 V, but lower I_C = −2 A and higher V_CE(sat) = −1.5 V; R_thJC = 10.0 °C/W.	Better surge tolerance but reduced continuous current capability and efficiency in high-duty-cycle operation.	Prefer for overvoltage-prone environments where peak clamping matters more than conduction loss.

Compared with MJD32CT4-A, the ON Semi MJD32C trades automotive qualification and tighter gain for lower cost, while Diodes' DXT32C prioritizes voltage margin over thermal and conduction performance-making the ST part optimal for AEC-Q101-compliant, thermally constrained PNP switching.

Availability

MJD32CT4-A is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, and commercial LED driver designs requiring stable component supply, long-term lifecycle assurance, and traceable AEC-Q101-compliant sourcing.

Supply support for MJD32CT4-A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing and rigorous quality certification.

The MJD32CT4-A belongs to ST's automotive-grade power transistor product line, engineered specifically for high-reliability linear and switching functions in harsh-environment vehicle subsystems and industrial controls.

FAQ

Is MJD32CT4-A pin-compatible with MJD31CT4-A?

No - MJD32CT4-A is a PNP transistor while MJD31CT4-A is its NPN complement; they share identical DPAK package dimensions and pinout (B-C-E), but polarity reversal means they cannot substitute directly without circuit topology changes. Both use Pin 1 = Base, Pin 2 = Collector (TAB), Pin 3 = Emitter.

What is the maximum allowable PCB copper area for thermal performance?

ST specifies R_thJA = 50 °C/W when mounted on a standard 1 inch² (645 mm²) FR-4 PCB with 2-oz copper. Increasing copper area beyond this yields diminishing returns; for R_thJA < 40 °C/W, dedicated internal copper planes or external heatsinks are required per DS5315 Figure 2 derating curve.

Does MJD32CT4-A support pulsed operation beyond 3 A?

Yes - absolute maximum rating I_CM = −5 A applies for pulse durations ≤ 300 μs and duty cycle ≤ 2%, as verified in DS5315 Figure 1 Safe Operating Area. Continuous operation above −3 A risks thermal runaway due to gain degradation and increased V_CE(sat) at elevated T_J.

Can the collector tab (Pin 2) be electrically connected to PCB ground?

No - Pin 2 is the collector terminal and must remain at the same potential as the collector node in the circuit. Connecting it to ground would short the collector-emitter path. For thermal management, it must be soldered to a dedicated copper pour isolated from all other nets unless the collector node itself is grounded in the application topology.

MJD32CT4-A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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):: 50µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 10 @ 3A, 4V

Power - Max:: 15 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD32CT4-A FAQ

1.How can I place an order for MJD32CT4-A through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD32CT4-A 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 MJD32CT4-A reliable?

The price and inventory of MJD32CT4-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD32CT4-A is usually 5 days.

3.What payment methods are accepted for MJD32CT4-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD32CT4-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD32CT4-A?

MJD32CT4-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD32CT4-A 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 MJD32CT4-A?

For technical support, including MJD32CT4-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD32CT4-A requirements.

6.How does Aetrix verify that MJD32CT4-A is sourced from the original manufacturer or authorized distributors?

All MJD32CT4-A 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 MJD32CT4-A meets industry standards.

7.What is the process for return or replacement of MJD32CT4-A?

All MJD32CT4-A units undergo pre-shipment inspection (PSI). If there is an issue with MJD32CT4-A, 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 MJD32CT4-A part is unused and in its original packaging.

Return procedure for MJD32CT4-A:

1.Submit a request within 90 days.

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

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