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STMicroelectronics MJD32C
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- Part No.:
- MJD32C
- Manufacturer:
- STMicroelectronics
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD32C.pdf
- Description:
- TRANS PNP 100V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
MJD32C from STMicroelectronics is a low-voltage PNP power transistor in DPAK (TO-252) surface-mount package, rated for -100 V VCEO, -3 A continuous collector current, and 15 W total dissipation at TC = 25 °C; it delivers high DC current gain (hFE = 25–50 at IC = -1 A) and low saturation voltage (VCE(sat) = -1.2 V at IC = -3 A, IB = -375 mA), used in linear regulators and switching power supplies.
For engineers reviewing the MJD32C datasheet, MJD32C pinout, MJD32C application, or MJD32C equivalent, this page provides verified electrical ratings, thermal resistance data (RthJC = 8.3 °C/W), safe operating area curves, and complementary NPN pairing with MJD31C - all critical for bipolar power stage design and thermal layout validation.
Technical Context
The MJD32C employs planar "base island" technology to achieve high hFE and low VCE(sat), enabling efficient operation in both linear and switching modes. Its -100 V VCEO and -50 µA ICEO support robust blocking in medium-voltage DC-DC stages.
Designed for surface-mount assembly in tape-and-reel format, it features a thermally enhanced DPAK package with exposed collector tab (Pin 3) for direct PCB heat sinking, and RthJPCB = 50 °C/W on 1 in², 2 oz Cu FR-4 - key for compact power board thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -100 V - supports operation in 48 V and 60 V DC bus systems with margin |
| IC (cont.) | -3 A - enables medium-power load switching up to ~30 W at 10 V drop |
| VCE(sat) | -1.2 V @ IC = -3 A - reduces conduction loss by >30% vs. standard PNP transistors |
| hFE | 25–50 @ IC = -1 A - ensures stable base drive sizing for predictable turn-on |
| RthJC | 8.3 °C/W - allows direct heatsink mounting to sustain 15 W dissipation below 125 °C junction rise |
| TJ(max) | 150 °C - compatible with industrial ambient (85 °C) and derated PCB layouts |
Pinout & Package
Package: DPAK (TO-252), surface-mount, thermally optimized with exposed collector tab (Pin 3) for PCB copper pour attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Connected to higher potential rail in PNP switch; requires low-inductance trace for fast turn-off |
| 2 (Base) | Control input | Driven with negative current relative to emitter; typical IB = -375 mA for full saturation |
| 3 (Collector / Tab) | Main current path & thermal interface | Electrically connected to collector; must be soldered to large copper area for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| High hFE (25–50) | Reduces required base drive current, easing driver IC selection and reducing gate resistor power loss |
| Low VCE(sat) (-1.2 V) | Lowers conduction losses in series-pass and switching applications, improving efficiency at 3 A loads |
| DPAK thermal performance (RthJC = 8.3 °C/W) | Enables direct heatsinking without external clip, simplifying mechanical integration in space-constrained designs |
| Complementary pairing with MJD31C | Supports push-pull and H-bridge topologies with matched voltage/current ratings and thermal profiles |
Applications
| Linear Voltage Regulator | DC-DC Switching Converter |
|---|---|
Use Scenario: Medium-current series pass element in adjustable 5–24 V linear regulators. IC Role / Device Role: PNP pass transistor controlling output voltage via emitter-follower configuration. Use Value: Low VCE(sat) minimizes dropout voltage and thermal stress under 2 A load conditions. | Use Scenario: High-side switch in non-synchronous buck or flyback converter primary side. IC Role / Device Role: PNP-controlled main switching device driving transformer or inductor. Use Value: -100 V rating and fast resistive switching times enable reliable operation at 48 V input rails. |
| Motor Driver Half-Bridge | Industrial Relay Driver |
Use Scenario: Upper leg of discrete half-bridge for 12–24 V brushed DC motor control. IC Role / Device Role: High-side PNP switch complementing NPN low-side (e.g., MJD31C). Use Value: Matched VCEO/IC and thermal behavior with MJD31C simplifies gate timing and thermal layout symmetry. | Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules. IC Role / Device Role: Load-switching transistor driving 24 V DC coils or solenoids. Use Value: -50 µA ICEO ensures minimal leakage-induced false triggering in high-impedance control circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD32C-1 (ON Semiconductor) | VCEO = -100 V, IC = -3 A, but hFE min = 20 (vs. 25) and RthJC = 9.0 °C/W | Slightly lower gain and thermal performance; acceptable where base drive margin exists | Select when sourcing diversification is required and minor derating is acceptable |
| PN3565 (Central Semiconductor) | VCEO = -60 V, IC = -2 A, TO-92 package - lower voltage/current, no thermal tab | Not suitable for >48 V or >2 A applications; limited to low-power signal-level switching | Only for legacy replacements in non-demanding, low-power circuits with existing TO-92 footprint |
Compared with MJD32C, the MJD32C-1 offers near-equivalent specs with modest thermal and gain trade-offs, while PN3565 is a downgraded alternative limited to lower voltage/current and lacks thermal capability - making MJD32C the optimal choice for industrial-grade 48 V power stages requiring reliability and thermal headroom.
Availability
MJD32C is available at Aetrix Electronics and suitable for linear regulators, DC-DC converters, and motor driver half-bridges requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for MJD32C 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, designing and manufacturing microcontrollers, power transistors, analog ICs, and MEMS sensors for industrial, automotive, and consumer markets.
The MJD32C belongs to ST's general-purpose bipolar power transistor family, engineered for high-reliability linear and switching applications where thermal robustness, gain consistency, and complementary NPN pairing are essential.
FAQ
What is the maximum safe operating temperature for MJD32C?
The MJD32C has a maximum junction temperature (TJ) of 150 °C. To maintain reliability, ensure case temperature stays ≤125 °C under full 15 W dissipation, using the specified RthJC = 8.3 °C/W and adequate PCB copper area or external heatsink per the DPAK footprint guidelines.
Can MJD32C be used in parallel configurations?
Yes, but only with careful thermal and current-sharing design: match hFE bins, use individual base resistors, and ensure identical PCB copper thermal paths. The "base island" structure improves gain uniformity, but VBE(on) variation (-1.8 V typ.) still requires emitter ballasting resistors for stable parallel operation above 5 A.
Is MJD32C pin-compatible with MJD31C?
No - MJD32C (PNP) and MJD31C (NPN) share identical DPAK package dimensions and pinout (Emitter/Base/Collector), but their polarity and biasing requirements differ fundamentally; they are complementary, not interchangeable. Circuit redesign is required when swapping between them.
Does MJD32C require a heatsink in typical applications?
A dedicated heatsink is not mandatory if PCB thermal design meets ST's DPAK layout recommendations: ≥1 in² of 2 oz copper connected to Pin 3 (collector tab). Under 3 A continuous load at 10 V VCE, junction temperature rise remains within limits without additional heatsinking - verified via RthJPCB = 50 °C/W data.
MJD32C 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:
- Obsolete
- 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
MJD32C FAQ
1.How can I place an order for MJD32C through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD32C 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 MJD32C reliable?
The price and inventory of MJD32C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD32C is usually 5 days.
3.What payment methods are accepted for MJD32C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD32C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD32C?
MJD32C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD32C 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 MJD32C?
For technical support, including MJD32C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD32C requirements.
6.How does Aetrix verify that MJD32C is sourced from the original manufacturer or authorized distributors?
All MJD32C 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 MJD32C meets industry standards.
7.What is the process for return or replacement of MJD32C?
All MJD32C units undergo pre-shipment inspection (PSI). If there is an issue with MJD32C, 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 MJD32C part is unused and in its original packaging.
Return procedure for MJD32C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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