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onsemi MJD31CG
- Part No.:
- MJD31CG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD31CG.pdf
- Description:
- TRANS NPN 100V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:694
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Product details
Overview
MJD31CG from onsemi is an NPN silicon power transistor in DPAK (TO-252) package, rated for 100 VCEO, 3 A continuous collector current, and 15 W total power dissipation at TC = 25 °C. It delivers hFE ≥ 10 at IC = 3 A, VCE = 4 V, with VCE(sat) ≤ 1.2 V under same conditions - designed for general-purpose amplification and low-speed switching in automotive and industrial power stages.
For engineers reviewing the MJD31CG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, Pb-free compliance, and validated alternative options for amplifier biasing, relay drivers, and linear regulator pass elements.
Technical Context
The MJD31CG operates as a medium-power NPN bipolar junction transistor with complementary PNP pairing via MJD32CG. Its safe operating area supports single-pulse operation up to 3 A at 100 V with 1 ms pulse width, and it exhibits fT = 3 MHz at IC = 500 mA, VCE = 10 V - confirming suitability for audio-frequency amplification and DC-DC converter base drive.
Thermal design relies on RJC = 8.3 °C/W and RJA = 80 °C/W (FR-4, 165 mm², 1 oz Cu), enabling surface-mount mounting without heatsink for ≤1.56 W ambient-limited operation. The NJV prefix variant (NJVMJD31CG*) confirms AEC-Q101 qualification and PPAP capability for automotive control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Maximum collector-emitter voltage before breakdown; enables use in 48 V and 72 V industrial bus applications. |
| IC (continuous) | 3.0 A - Sustained collector current rating; supports relay coils, small solenoids, and linear regulator pass devices. |
| PD @ TC = 25 °C | 15 W - Power dissipation limit with case temperature controlled; requires thermal pad and copper pour for full utilization. |
| hFE | 10–50 - DC current gain range at IC = 3 A, VCE = 4 V; sufficient for direct TTL/CMOS base drive without external amplification. |
| VCE(sat) | ≤1.2 V @ IC = 3 A, IB = 375 mA - Low saturation voltage reduces conduction loss in switching applications. |
| fT | 3 MHz - Current-gain-bandwidth product; validates usability in audio preamp and low-frequency signal amplification. |
| RJA | 80 °C/W - Junction-to-ambient thermal resistance on standard FR-4 PCB; defines maximum ambient temperature for safe 1.56 W operation. |
Pinout & Package
DPAK (TO-252) surface-mount package with exposed drain tab (pin 2 and 4 tied to collector), 6.10 × 6.54 × 2.28 mm footprint, Pb-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input terminal; requires ≥375 mA base drive for full 3 A collector conduction. |
| 2 | Collector | Main high-current output node; electrically connected to pin 4 and thermal tab for heat sinking. |
| 3 | Emiter | Current return path; referenced to system ground in common-emitter configurations. |
| 4 | Collector | Second collector connection; shares same node as pin 2 and thermal pad for enhanced thermal and current handling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control modules and body electronics. |
| UL 94 V−0 epoxy | Flame-retardant encapsulation meets safety standards for industrial equipment enclosures. |
| Complementary pair with MJD32CG | Enables push-pull amplifier and H-bridge driver designs without cross-manufacturer compatibility concerns. |
| Pb-free and RoHS compliant | Fulfills global environmental compliance requirements for consumer, medical, and industrial end products. |
| Surface-mount lead-formed version | Optimized for automated assembly; no lead trimming required prior to reflow soldering. |
Applications
| Automotive Relay Driver | Linear Voltage Regulator Pass Element |
|---|---|
Use Scenario: Driving 12 V/24 V automotive relays in body control modules where PWM switching is not required. IC Role / Device Role / Timing Role: NPN switch controlling relay coil current with TTL-compatible base drive. Use Value: VCE(sat) ≤ 1.2 V minimizes coil power loss; 100 V rating accommodates load dump transients up to 87 V per ISO 7637-2. |
Use Scenario: Acting as series pass transistor in adjustable linear regulators delivering up to 3 A output current. IC Role / Device Role / Timing Role: Power transistor regulating output voltage by dissipating excess input-output differential. Use Value: 15 W power rating and 8.3 °C/W RJC enable stable operation with modest heatsinking at 5 V dropout and 3 A load. |
| Audio Power Amplifier Stage | Industrial Motor Starter Circuit |
Use Scenario: Output stage in Class-A/B audio amplifiers for public address systems and instrumentation. IC Role / Device Role / Timing Role: Medium-power NPN emitter-follower or common-emitter amplifier with fT = 3 MHz bandwidth. Use Value: hFE ≥ 10 at 3 A ensures predictable gain stability across temperature; low VBE(on) ≤ 1.8 V simplifies bias network design. |
Use Scenario: Controlling small AC induction motor start windings or DC brush motor armature current in HVAC actuators. IC Role / Device Role / Timing Role: Low-speed switching element enabling motor energization/de-energization on command. Use Value: 3 A continuous rating supports motors drawing ≤2.5 A startup current; SOA curve permits brief 5 A peak surges during stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BUJ302A | Same DPAK package, but VCEO = 60 V, IC = 4 A, hFE = 20–120 - higher current gain and lower voltage rating. | Preferred for 24 V systems requiring higher hFE and tighter gain binning; unsuitable for 48 V+ bus monitoring. | Select BUJ302A when gain consistency and 4 A surge tolerance outweigh 100 V requirement. |
| ON Semiconductor MJD31CRLG | Same die, identical specs, but supplied in 1800-unit tape-and-reel format - no electrical or thermal difference. | No functional difference; optimized for high-volume SMT production rather than prototyping or low-volume builds. | Choose MJD31CRLG for automated assembly lines; MJD31CG remains optimal for engineering samples and small-batch builds. |
Compared with BUJ302A, MJD31CG offers superior voltage margin for 48 V industrial buses but lower hFE spread; versus MJD31CRLG, it shares identical performance but differs only in packaging format and order quantity - making MJD31CG the preferred choice for design validation and low-volume deployment.
Availability
MJD31CG is available at Aetrix Electronics and suitable for automotive relay drivers, linear voltage regulator pass elements, audio amplifier stages, and industrial motor starter circuits requiring stable component supply, AEC-Q101 traceability, and Pb-free compliance.
Supply support for MJD31CG 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, cloud, and IoT applications.
The MJD31CG belongs to onsemi's complementary power transistor family, engineered for robust, cost-effective amplification and switching in harsh-environment applications where reliability, thermal performance, and automotive qualification are mandatory.
FAQ
What is the maximum junction temperature for the MJD31CG?
The MJD31CG has an operating junction temperature range of −65 °C to +150 °C. This wide range supports deployment in under-hood automotive environments and industrial enclosures with minimal forced cooling. Derating begins above 25 °C case temperature at 0.12 W/°C for case-limited operation and 0.012 W/°C for ambient-limited operation. Thermal design must respect both RJC = 8.3 °C/W and RJA = 80 °C/W limits to avoid exceeding 150 °C junction temperature under sustained load. The MJD31CG datasheet specifies these values on page 1 under Thermal Characteristics.
Is the MJD31CG pin-compatible with the TIP31C?
No, the MJD31CG is not pin-compatible with the TIP31C. While electrically similar per the datasheet, the MJD31CG uses a DPAK (TO-252) 4-pin surface-mount package with pins 1 (Base), 2 (Collector), 3 (Emitter), and 4 (Collector), whereas the TIP31C uses TO-220 with pins 1 (Emitter), 2 (Base), 3 (Collector). Layout redesign and footprint change are required. The MJD31CG's dual-collector configuration and thermal pad also differ fundamentally from TIP31C's through-hole mechanical mounting. Use MJD31CG only in new DPAK-based designs or with adapter boards.
Does the MJD31CG require a heatsink in typical applications?
The MJD31CG requires a heatsink only when operating near its 15 W case-limited power dissipation. At ambient-limited conditions (TA = 25 °C), its 1.56 W maximum dissipation allows operation without external heatsinking on standard FR-4 PCBs with adequate copper pour. However, for >1 W continuous dissipation, a thermal pad connected to ≥165 mm² of 1 oz copper is mandatory per datasheet Note 1. In automotive applications where ambient exceeds 85 °C, even 500 mW may necessitate supplemental copper or metal-core PCB layers. The MJD31CG thermal data is fully specified in the "Thermal Characteristics" table on page 1.
What does the "G" suffix in MJD31CG signify?
The "G" suffix in MJD31CG indicates Pb-free (lead-free) packaging and RoHS compliance, as confirmed in the datasheet's Ordering Information section (page 8) and Features list (page 1). It denotes that the device uses matte tin plating and halogen-free epoxy molding compound meeting JEDEC J-STD-020 moisture sensitivity level 1 and UL 94 V−0 flammability rating. The "G" does not indicate tape-and-reel packaging - that is denoted by "RLG" or "T4G" suffixes. All MJD31CG units shipped by Aetrix Electronics carry this Pb-free designation per onsemi's manufacturing standard.
Can the MJD31CG be used in complementary symmetry amplifier circuits?
Yes, the MJD31CG is explicitly designed for complementary symmetry amplifier circuits alongside its PNP counterpart, the MJD32CG. Both share identical DPAK package dimensions, thermal characteristics, and voltage/current ratings (MJD32CG: VCEO = 100 V, IC = −3 A), enabling matched thermal tracking and symmetrical clipping behavior. The datasheet states "MJD31 (NPN), MJD32 (PNP)" as a complementary pair on page 1 and confirms matching SOA curves on pages 5 and 7. For Class-B or AB audio output stages, using MJD31CG and MJD32CG together ensures consistent gain, saturation, and thermal response - critical for low-distortion performance.
MJD31CG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 1.56 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD31CG FAQ
1.How can I place an order for MJD31CG through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD31CG 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 MJD31CG reliable?
The price and inventory of MJD31CG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD31CG is usually 5 days.
3.What payment methods are accepted for MJD31CG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD31CG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD31CG?
MJD31CG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD31CG 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 MJD31CG?
For technical support, including MJD31CG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD31CG requirements.
6.How does Aetrix verify that MJD31CG is sourced from the original manufacturer or authorized distributors?
All MJD31CG 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 MJD31CG meets industry standards.
7.What is the process for return or replacement of MJD31CG?
All MJD31CG units undergo pre-shipment inspection (PSI). If there is an issue with MJD31CG, 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 MJD31CG part is unused and in its original packaging.
Return procedure for MJD31CG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MJD31CG Tags
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