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onsemi MJD32T4
- Part No.:
- MJD32T4
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD32T4.pdf
- Description:
- TRANS PNP 40V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,591
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Product details
Overview
MJD32T4 from onsemi is a PNP complementary power transistor in DPAK (TO-252) surface-mount package, rated for 40 VCEO, 3 A continuous collector current, and 15 W total power dissipation at TC = 25 °C. It serves as a low-speed switching and general-purpose amplifier device in automotive and industrial power control circuits, with AEC-Q101 qualification and Pb-free RoHS compliance.
For engineers reviewing the MJD32T4 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical ratings, thermal performance data, package dimensions, junction-to-case thermal resistance (8.3 °C/W), and validated alternative transistors for amplifier and switching designs requiring stable gain (hFE ≥ 10 at IC = 3 A), low VCE(sat) (≤1.2 V), and automotive-grade reliability.
Technical Context
The MJD32T4 is a silicon planar epitaxial PNP bipolar junction transistor optimized for linear amplification and low-frequency switching. Its DC current gain (hFE) ranges from 10 to 50 at IC = 3 A and VCE = 4 V, with a maximum fT of 3 MHz under specified test conditions. The device features a dual-collector configuration (pins 2 and 4 tied internally), enabling higher current handling without external paralleling.
Thermal design is constrained by RθJC = 8.3 °C/W and RθJA = 80 °C/W on FR-4 board with minimum recommended copper pad (165 mm², 1 oz Cu). It supports operation across −65 °C to +150 °C junction temperature range and meets UL 94 V−0 flammability rating at 0.125 in thickness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown in open-base condition; defines upper rail limit in switching applications. |
| IC (continuous) | 3.0 A - Continuous collector current capability; sets maximum steady-state load drive capacity with adequate heatsinking. |
| PD @ TC = 25 °C | 15 W - Total power dissipation limit when case temperature is maintained at 25 °C; requires thermal interface to heatsink. |
| hFE (IC = 3 A) | 10–50 - DC current gain range at full-rated current; determines required base drive for saturation in switching mode. |
| VCE(sat) (IC = 3 A, IB = 375 mA) | ≤1.2 V - Saturation voltage drop; directly impacts conduction loss and thermal rise in high-current switch applications. |
| RθJC | 8.3 °C/W - Junction-to-case thermal resistance; enables accurate calculation of junction temperature rise above heatsink temperature. |
| AEC-Q101 | Qualified - Certified for automotive electronics use; includes stress testing for temperature cycling, HTRB, and ESD (HBM Class 3B). |
Pinout & Package
DPAK (TO-252) surface-mount package, Case 369C, 4-pin outline with pins 2 and 4 internally connected to collector. Requires minimum 165 mm² copper pad (1 oz) for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; accepts base current to bias transistor into active or saturation region; requires current-limiting resistor in most driver circuits. |
| 2 | Collector | Main high-side current path; electrically tied to pin 4; connects to load return or supply rail depending on circuit topology. |
| 3 | Emiter | Common emitter node; typically connected to ground or positive rail in PNP high-side switch configurations. |
| 4 | Collector | Redundant collector terminal; must be connected to same net as pin 2 to maintain rated current and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Lead-formed for SMT in tape-and-reel | "T4" suffix denotes 2,500-unit tape-and-reel packaging optimized for automated pick-and-place assembly. |
| AEC-Q101 qualified | Validated for automotive under-hood and body-control modules; includes PPAP documentation support. |
| Dual-collector configuration | Pins 2 and 4 both connect to collector; reduces current density per bond wire and improves thermal distribution. |
| UL 94 V−0 epoxy | Flame-retardant encapsulation suitable for safety-critical industrial and transportation equipment. |
| Pb-free and RoHS compliant | Meets global environmental regulations; compatible with lead-free reflow soldering profiles up to 260 °C peak. |
Applications
| Automotive Lighting Control | Industrial DC Motor Driver |
|---|---|
Use Scenario: Driving high-current LED headlamp arrays or incandescent bulbs in vehicle lighting modules. IC Role / Device Role / Timing Role: PNP high-side switch controlling 12 V/2 A loads with PWM dimming at ≤1 kHz. Use Value: Low VCE(sat) minimizes heat generation during sustained ON state; AEC-Q101 ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Controlling direction and speed of brushed DC motors in HVAC actuators and seat adjusters. IC Role / Device Role / Timing Role: Complementary PNP switch in H-bridge half-bridge stage, paired with NPN MJD31T4. Use Value: Matched hFE and VCE(sat) with MJD31 series enables balanced drive strength and thermal behavior in bidirectional motor control. |
| Linear Voltage Regulator Pass Element | Power Supply OR-ing Circuit |
Use Scenario: Serving as pass transistor in adjustable linear regulators delivering up to 2.5 A at 5–12 V output. IC Role / Device Role / Timing Role: Series-pass element operating in active region; dissipates excess input-output voltage as heat. Use Value: 15 W power rating and 8.3 °C/W RθJC allow stable operation with modest heatsinking at full load. |
Use Scenario: Enabling redundant power inputs in telecom and industrial power supplies using discrete OR-ing diode replacement. IC Role / Device Role / Timing Role: PNP-based ideal diode controller front-end switch managing two 12 V inputs. Use Value: Low VBE(on) (≤1.8 V) and predictable hFE simplify base-drive design for low-loss reverse-current blocking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD32CT4G | Higher VCEO = 100 V; otherwise identical pinout, package, and gain characteristics. | Suitable for 24 V or 48 V systems where higher breakdown margin is required; not drop-in in 12 V-only designs due to cost and gain trade-offs. | Select MJD32CT4G only if system max VCE exceeds 40 V; otherwise MJD32T4 offers optimal cost/performance balance. |
| BD240C | TO-126 package (through-hole); VCEO = 100 V; hFE min = 40 at IC = 1.5 A; no AEC-Q101 qualification. | Used in legacy industrial PCBs with through-hole assembly; lacks automotive qualification and surface-mount compatibility. | Choose BD240C only for repair or non-automotive through-hole designs; MJD32T4 is superior for new SMT and automotive projects. |
Compared with MJD32CT4G and BD240C, the MJD32T4 provides the best combination of automotive qualification, DPAK surface-mount compatibility, and optimized 40 V/3 A performance for cost-sensitive, high-volume automotive and industrial switching applications.
Availability
MJD32T4 is available at Aetrix Electronics and suitable for automotive lighting control, industrial DC motor drivers, linear voltage regulator pass elements, and power supply OR-ing circuits requiring stable component supply, AEC-Q101 compliance, and surface-mount manufacturability.
Supply support for MJD32T4 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MJD32T4 belongs to onsemi's complementary power transistor family designed specifically for robust, cost-effective amplifier and low-speed switching applications in automotive and industrial environments where reliability and thermal performance are critical.
FAQ
What is the maximum continuous collector current rating for the MJD32T4?
The MJD32T4 is rated for 3.0 A continuous collector current (IC) at TC = 25 °C. This rating assumes proper heatsinking and adherence to the derating curve - power dissipation must be reduced by 0.12 W/°C above 25 °C case temperature. At ambient conditions without heatsinking, the usable current is limited by RθJA = 80 °C/W and the 1.56 W ambient-rated power limit.
Is the MJD32T4 pin-compatible with the TIP32 series?
The MJD32T4 is electrically similar to the TIP32 series but not pin-compatible. While both are PNP power transistors, the MJD32T4 uses a DPAK (TO-252) 4-pin surface-mount package with pins 2 and 4 tied to collector, whereas TIP32 devices use TO-220 through-hole packages with 3 distinct leads. Direct PCB replacement requires layout revision and thermal redesign.
Does the MJD32T4 require a heatsink in typical automotive applications?
Yes - the MJD32T4 requires a heatsink when dissipating more than ~1.5 W continuously. Its RθJA = 80 °C/W on standard FR-4 limits junction temperature rise significantly without copper thermal relief. For example, at 3 A and VCE(sat) = 1.2 V (3.6 W dissipation), a heatsink lowering RθCA to ≤10 °C/W is necessary to keep TJ below 150 °C at 85 °C ambient.
What does the "NJV" prefix in NJVMJD32T4G* indicate?
"NJV" denotes an onsemi manufacturing variant meeting automotive-specific requirements: unique site and process control, AEC-Q101 qualification, and PPAP capability. The NJVMJD32T4G* part number is functionally identical to MJD32T4 but intended for automotive Tier-1 suppliers requiring strict change control, traceability, and audit-ready documentation.
Can the MJD32T4 be used in parallel with another MJD32T4 for higher current handling?
No - the MJD32T4 is not characterized or recommended for parallel operation. Its hFE variation (10–50) and thermal coupling limitations make current sharing unpredictable. For >3 A applications, use a single higher-rated device (e.g., MJD32CT4G for 100 V systems) or implement active current-balancing circuitry, which adds complexity and cost beyond the benefit of paralleling.
MJD32T4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 40 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:
- 3MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD32T4 FAQ
1.How can I place an order for MJD32T4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD32T4 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 MJD32T4 reliable?
The price and inventory of MJD32T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD32T4 is usually 5 days.
3.What payment methods are accepted for MJD32T4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD32T4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD32T4?
MJD32T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD32T4 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 MJD32T4?
For technical support, including MJD32T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD32T4 requirements.
6.How does Aetrix verify that MJD32T4 is sourced from the original manufacturer or authorized distributors?
All MJD32T4 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 MJD32T4 meets industry standards.
7.What is the process for return or replacement of MJD32T4?
All MJD32T4 units undergo pre-shipment inspection (PSI). If there is an issue with MJD32T4, 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 MJD32T4 part is unused and in its original packaging.
Return procedure for MJD32T4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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