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onsemi MJD31CT4
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- Part No.:
- MJD31CT4
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD31CT4.pdf
- Description:
- TRANS NPN 100V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,308
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Product details
Overview
MJD31CT4 from onsemi is an NPN silicon power transistor in DPAK (TO-252) surface-mount package, rated for 100 VCEO, 3 A continuous collector current, and 15 W total power dissipation at TC = 25 °C. It serves as a general-purpose amplifier and low-speed switching device in automotive, industrial, and power supply circuits requiring AEC-Q101 qualification and Pb-free compliance.
For engineers reviewing the MJD31CT4 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, complementary PNP pairing with MJD32CT4, and real-world design implications for linear regulation, relay driving, and motor control stages.
Technical Context
The MJD31CT4 operates as a medium-power bipolar junction transistor with DC current gain (hFE) of 10–50 at IC = 3 A and VCE = 4 V, and exhibits VCE(sat) ≤ 1.2 V under IC = 3 A / IB = 375 mA conditions. Its fT is 3 MHz, confirming suitability for audio-frequency amplification and <100 kHz switching.
Thermally, it features RθJC = 8.3 °C/W and RθJA = 80 °C/W when mounted on FR-4 with 165 mm² copper pad, enabling stable operation up to +150 °C junction temperature. The NJV prefix confirms AEC-Q101 qualification and PPAP capability for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Supports high-side switching in 48 V industrial systems and flyback snubber circuits without breakdown. |
| IC (continuous) | 3.0 A - Drives solenoids, small DC motors, or parallel LED strings with margin for transient surges. |
| PD @ TC = 25 °C | 15 W - Requires heatsinking above ~1.5 W ambient dissipation; derates 0.12 W/°C above 25 °C case temp. |
| hFE | 10–50 - Enables simple base-resistor biasing for linear regulators and Class-A amplifiers without feedback complexity. |
| VCE(sat) | ≤1.2 V @ IC/IB = 10 - Limits conduction loss to <3.6 W at full load, critical for thermally constrained PCB layouts. |
| fT | 3 MHz - Sufficient for audio preamplifier stages and PWM dimming at ≤100 kHz, but not RF or fast digital switching. |
| RθJC | 8.3 °C/W - Allows direct thermal coupling to copper pour or heatsink for >10 W sustained operation with <85 °C ΔT. |
Pinout & Package
DPAK (TO-252) package with exposed drain tab (pin 2 and 4 tied to collector), 6.10 × 6.54 × 2.28 mm footprint, Pb-free (G suffix), RoHS compliant, UL 94 V−0 rated epoxy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input requiring ≥375 mA drive for full saturation; base-emitter voltage ≤1.8 V at IC = 3 A. |
| 2 | Collector | Main high-current output node; electrically connected to pin 4; must be routed to thermal pad for heat dissipation. |
| 3 | Emiter | Current return path; common reference for base bias network and load grounding in low-side switch configurations. |
| 4 | Collector | Second collector terminal for enhanced thermal and current handling; soldered directly to PCB copper pour or heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control modules and body electronics. |
| DPAK tape-and-reel (2500 pcs) | Enables automated SMT placement with consistent orientation (pin 1 marked); eliminates manual lead forming. |
| Complementary pair with MJD32CT4 | Enables push-pull output stages and H-bridge drivers without cross-manufacturer matching effort. |
| UL 94 V−0 epoxy | Meets flammability requirements for industrial power supplies and safety-critical enclosures. |
| Electrically similar to TIP31C | Allows drop-in replacement in legacy designs using through-hole TIP31C, provided thermal and layout constraints are re-evaluated. |
Applications
| Automotive Relay Driver | Linear Voltage Regulator Pass Element |
|---|---|
|
Use Scenario: Driving 12 V/24 V automotive relays in body control modules where EMI immunity and long-term reliability are critical. IC Role / Device Role / Timing Role: Low-speed switching transistor operating in saturation mode with <100 µs turn-on/off times. Use Value: AEC-Q101 qualification ensures operation across −40 °C to +125 °C ambient, while VCEO = 100 V withstands load-dump transients up to 87 V. |
Use Scenario: Pass element in adjustable 3-terminal linear regulators delivering up to 2.5 A at 5–12 V outputs for infotainment subsystems. IC Role / Device Role / Timing Role: Linear-mode current amplifier controlled by error amplifier feedback loop. Use Value: hFE ≥10 at 3 A enables stable closed-loop regulation without external Darlington assist; RθJC = 8.3 °C/W supports heatsink-free operation below 1.2 W dissipation. |
| DC Motor Speed Control (Low-Frequency PWM) | Industrial Solenoid Actuator |
|
Use Scenario: Controlling brushed DC motors in HVAC dampers or factory automation actuators using 1–20 kHz PWM. IC Role / Device Role / Timing Role: Low-side switch modulating motor current with duty-cycle-controlled conduction. Use Value: VCE(sat) ≤1.2 V minimizes I²R losses during on-state; fT = 3 MHz ensures adequate gain margin at 20 kHz switching frequency. |
Use Scenario: Energizing 24 V/1.5 A industrial solenoids in pneumatic valve manifolds requiring robust surge tolerance. IC Role / Device Role / Timing Role: High-current switch absorbing inductive kickback via external flyback diode. Use Value: ICM = 5 A peak rating handles solenoid turn-on surge; VCEO = 100 V prevents breakdown during 2× supply voltage flyback events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD31CRLG | Same die, identical specs, but supplied in 1800-piece tape-and-reel (not 2500); no NJV prefix. | Lacks AEC-Q101 qualification and PPAP support; suitable for non-automotive industrial use only. | Select MJD31CRLG only if automotive compliance is unnecessary and smaller reel size aligns with production planning. |
| TIP31C | Through-hole TO-220 package; same VCEO, IC, hFE, and VCE(sat); higher RθJA (65 °C/W vs. 80 °C/W). | Requires PCB through-holes and manual assembly; less suitable for high-density SMT lines. | Choose TIP31C only for prototyping or legacy repair where DPAK footprint is unavailable; verify thermal performance with new layout. |
Compared with MJD31CT4, MJD31CRLG offers identical electrical behavior but omits automotive qualification, while TIP31C provides functional equivalence in through-hole form-neither is pin-compatible, and both require layout or process changes.
Availability
MJD31CT4 is available at Aetrix Electronics and suitable for automotive relay drivers, linear regulator pass elements, and industrial solenoid actuators requiring stable component supply, AEC-Q101 traceability, and Pb-free compliance.
Supply support for MJD31CT4 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 MJD31CT4 belongs to onsemi's complementary power transistor family designed for rugged, cost-effective amplification and switching in automotive-grade and industrial power systems.
FAQ
What is the maximum junction temperature rating for MJD31CT4?
The MJD31CT4 has a specified operating junction temperature range of −65 °C to +150 °C. This allows reliable operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures, provided thermal design maintains TJ within limits using the published RθJC and RθJA values. Derating curves in the datasheet must be followed for sustained power dissipation.
Is MJD31CT4 pin-compatible with TIP31C?
No, MJD31CT4 is not pin-compatible with TIP31C. MJD31CT4 uses a DPAK (TO-252) 4-pin surface-mount package with pins 1=Base, 2=Collector, 3=Emitter, 4=Collector, whereas TIP31C uses a TO-220 through-hole package with pins 1=Base, 2=Collector, 3=Emitter. Physical layout, mounting method, and thermal interface differ fundamentally-direct replacement requires PCB redesign.
Does MJD31CT4 support high-frequency switching applications?
The MJD31CT4 has a current-gain-bandwidth product (fT) of 3 MHz, limiting its effective use to low-speed switching (<100 kHz) and audio-frequency amplification. It is not suitable for high-frequency SMPS, RF, or fast digital logic interfacing. For >500 kHz operation, consider MOSFETs or RF-optimized BJTs with higher fT ratings.
What does the "NJV" prefix in NJVMJD31CT4G* indicate?
"NJV" denotes a specific manufacturing site and control change configuration required for automotive and other high-reliability applications. It signifies AEC-Q101 qualification, PPAP capability, and enhanced traceability-including unique wafer lot and assembly location tracking. The asterisk in NJVMJD31CT4G* reflects internal ordering notation, not a functional variant of MJD31CT4.
Can MJD31CT4 be used in complementary symmetry amplifier stages?
Yes, MJD31CT4 (NPN) is explicitly designed to pair with MJD32CT4 (PNP) as a complementary power transistor set. Both share matched VCEO, IC, hFE, and thermal characteristics, enabling balanced push-pull output stages in audio amplifiers, motor drivers, and Class-B/AB linear circuits without gain or saturation mismatch.
MJD31CT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- 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:
- 3MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD31CT4 FAQ
1.How can I place an order for MJD31CT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD31CT4 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 MJD31CT4 reliable?
The price and inventory of MJD31CT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD31CT4 is usually 5 days.
3.What payment methods are accepted for MJD31CT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD31CT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD31CT4?
MJD31CT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD31CT4 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 MJD31CT4?
For technical support, including MJD31CT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD31CT4 requirements.
6.How does Aetrix verify that MJD31CT4 is sourced from the original manufacturer or authorized distributors?
All MJD31CT4 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 MJD31CT4 meets industry standards.
7.What is the process for return or replacement of MJD31CT4?
All MJD31CT4 units undergo pre-shipment inspection (PSI). If there is an issue with MJD31CT4, 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 MJD31CT4 part is unused and in its original packaging.
Return procedure for MJD31CT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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