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Nexperia USA Inc. MJD32CAJ
- Part No.:
- MJD32CAJ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD32CAJ.pdf
- Description:
- TRANS PNP 100V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:11,345
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Product details
Overview
MJD32CAJ from Nexperia is a PNP high-power bipolar transistor in DPAK (SOT428C) package, rated for −100 V VCEO, −3 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 automotive and industrial power management systems, with AEC-Q101 qualification and low −1.2 V VCE(sat) at −3 A.
For engineers reviewing the MJD32CAJ datasheet, MJD32CAJ pinout, MJD32CAJ application, or MJD32CAJ equivalent, key selection factors include its PNP polarity, thermal resistance of 9 K/W (junction-to-mounting base), DC current gain range of 10–50 at −3 A, and suitability for constant-current backlight drive and relay replacement where high-energy efficiency and fast switching are required.
Technical Context
This PNP transistor operates in active, saturation, and cutoff regions with verified DC current gain (hFE) of 10–50 at VCE = −4 V and IC = −3 A, and exhibits −1.2 V collector-emitter saturation voltage under forced β = 8 condition (IC/IB = 8). Its transition frequency fT is 3 MHz at VCE = −10 V, IC = −500 mA, confirming suitability for medium-speed switching.
Thermal design is enabled by direct mounting-base connection to collector (pin 2 + mb), delivering Rth(j-mb) = 9 K/W and supporting 15 W power dissipation at Tmb ≤ 25 °C. The device's −6 V VEB0 rating and −50 µA ICES at 150 °C ensure stable operation in high-temperature automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −100 V - Maximum blocking voltage in open-base configuration; enables use in 48 V automotive supply rails with margin. |
| IC | −3 A continuous - Sustained load current capability; supports motor drive and relay coil control without derating at 25 °C ambient. |
| VCE(sat) | −1.2 V at IC = −3 A, IB = −375 mA - Low conduction loss reduces heat generation in linear-mode regulators and constant-current sources. |
| hFE | 10–50 at VCE = −4 V, IC = −3 A - Predictable current amplification for base-drive sizing in discrete power stages. |
| Rth(j-mb) | 9 K/W - Thermal resistance from junction to mounting base; requires direct PCB copper pad contact for 15 W dissipation. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control, body electronics, and lighting modules. |
| fT | 3 MHz - Transition frequency confirms usable bandwidth for PWM dimming (≤100 kHz) and relay debouncing circuits. |
Pinout & Package
DPAK (SOT428C) surface-mount plastic package with 3 leads (one lead cropped); mounting base (mb) is electrically connected to collector and serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; requires −375 mA drive for full saturation at −3 A collector current. |
| 2 | Collector (C) + Mounting Base (mb) | Main current-carrying and thermal interface terminal; must be soldered to ≥1 cm² tin-plated copper pad on FR4 PCB. |
| 3 | Emiter (E) | Current output node; connects to load return or ground in high-side switch configurations. |
Key Features
| Feature | Design Value |
|---|---|
| High thermal power dissipation | 15 W at mounting base ≤ 25 °C - Enables compact heatsinkless designs in space-constrained automotive ECUs. |
| Low VCE(sat) | −1.2 V at −3 A - Reduces conduction loss to 3.6 W, minimizing thermal stress in linear-mode voltage regulation. |
| Fast switching speeds | fT = 3 MHz - Supports clean turn-on/turn-off in 20–100 kHz PWM backlight drivers without excessive ringing. |
| AEC-Q101 qualification | Stress-tested per automotive discrete semiconductor standard - Ensures reliability in under-hood and cabin temperature profiles (−40 to 150 °C). |
| Electrically similar to MJD32 series | Pinning, gain, and saturation behavior match legacy MJD32CA - Allows drop-in replacement in existing production boards. |
Applications
| Automotive Body Control Module | Industrial Linear Voltage Regulator |
|---|---|
|
Use Scenario: Driving 12 V solenoid valves and HVAC actuators in BCMs with PWM-controlled current limiting. IC Role / Device Role / Timing Role: High-side PNP switch controlling load current path from battery rail to ground-return loads. Use Value: −100 V VCEO withstands load-dump transients; AEC-Q101 ensures 15-year field reliability in vehicle life cycle. |
Use Scenario: Pass element in adjustable 5–24 V linear regulators powering analog sensors and microcontrollers. IC Role / Device Role / Timing Role: Series-pass transistor operating in active region to maintain precise output voltage under varying load. Use Value: Low −1.2 V VCE(sat) minimizes dropout voltage and power loss, enabling stable regulation even at 3 A output. |
| LED Backlight Constant-Current Driver | DC Motor Speed Control |
|
Use Scenario: Precision current source for LCD panel edge-lit LED strings in infotainment displays. IC Role / Device Role / Timing Role: Current-regulating PNP transistor in feedback-controlled emitter-follower configuration. Use Value: Tight hFE spread (10–50) and low thermal drift enable ±3% current accuracy across −40 to 105 °C. |
Use Scenario: H-bridge half-bridge driver for 24 V brushed DC motors in power seats and window lifts. IC Role / Device Role / Timing Role: High-current PNP switch in complementary pair with NPN MJD31CA for bidirectional control. Use Value: Matched thermal characteristics with MJD31CA simplify thermal layout; 5 A peak current handles motor stall conditions. |
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 MJD32C | Same VCEO (−100 V), IC (−3 A), but not AEC-Q101 qualified; Rth(j-mb) = 10 K/W vs. 9 K/W. | Lacks automotive qualification; suitable for industrial non-safety-critical loads only. | Select when cost sensitivity outweighs automotive compliance requirements. |
| STMicroelectronics BD139 | Lower VCEO (−80 V), higher VCE(sat) (−1.5 V), TO-126 through-hole package; no AEC-Q101. | Not suitable for 48 V systems or surface-mount assembly; limited to low-density consumer PCBs. | Choose only for legacy through-hole designs where board rework is prohibitive. |
Compared with MJD32C and BD139, MJD32CAJ provides superior thermal performance (9 K/W), automotive qualification, and surface-mount compatibility-making it the optimal choice for new automotive and high-reliability industrial designs requiring robust PNP switching.
Availability
MJD32CAJ is available at Aetrix Electronics and suitable for automotive body control modules, industrial linear voltage regulators, LED backlight constant-current drivers, and DC motor speed control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MJD32CAJ 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 logic, discrete, and MOSFET devices, with core expertise in automotive-grade components and advanced packaging.
MJD32CAJ belongs to Nexperia's high-power bipolar transistor family, engineered specifically for automotive and industrial power switching applications demanding AEC-Q101 reliability, low saturation voltage, and thermally efficient DPAK packaging.
FAQ
Is MJD32CAJ pin-compatible with MJD32C?
Yes, MJD32CAJ and MJD32C share identical DPAK (SOT428C) pinout: Pin 1 = Base, Pin 2 = Collector + Mounting Base, Pin 3 = Emitter. Both devices use the same footprint and thermal pad layout per Nexperia's sot428c_fr soldering specification.
What is the maximum allowable mounting base temperature for continuous 3 A operation?
At IC = −3 A and VCE = −1.2 V, power dissipation is 3.6 W. With Rth(j-mb) = 9 K/W, junction temperature rise is 32.4 K. To stay within Tj ≤ 150 °C, mounting base temperature must not exceed 117.6 °C - verified per Figure 1 derating curve for FR4 PCB mounting.
Can MJD32CAJ replace MJD32 in existing designs?
Yes - MJD32CAJ is a direct functional and mechanical replacement for legacy MJD32 series parts. It matches electrical parameters (VCEO, IC, hFE, VCE(sat)) and uses the same SOT428C package, while adding AEC-Q101 qualification and improved thermal resistance.
Does MJD32CAJ require a heatsink for 3 A DC operation?
No external heatsink is required if mounted on a ≥1 cm² tin-plated copper pad on FR4 PCB per datasheet condition [2]. The 9 K/W Rth(j-mb) and 15 W Ptot rating enable full 3 A operation at Tmb ≤ 25 °C; derating applies above that temperature per Figure 1.
MJD32CAJ 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD32CAJ FAQ
1.How can I place an order for MJD32CAJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD32CAJ 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 MJD32CAJ reliable?
The price and inventory of MJD32CAJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD32CAJ is usually 5 days.
3.What payment methods are accepted for MJD32CAJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD32CAJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD32CAJ?
MJD32CAJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD32CAJ 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 MJD32CAJ?
For technical support, including MJD32CAJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD32CAJ requirements.
6.How does Aetrix verify that MJD32CAJ is sourced from the original manufacturer or authorized distributors?
All MJD32CAJ 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 MJD32CAJ meets industry standards.
7.What is the process for return or replacement of MJD32CAJ?
All MJD32CAJ units undergo pre-shipment inspection (PSI). If there is an issue with MJD32CAJ, 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 MJD32CAJ part is unused and in its original packaging.
Return procedure for MJD32CAJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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