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Nexperia USA Inc. MJD2873-QJ
- Part No.:
- MJD2873-QJ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD2873-QJ.pdf
- Description:
- TRANS NPN 50V 2A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:7,370
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Product details
Overview
MJD2873-QJ from Nexperia is a 50 V, 2 A NPN high-power bipolar transistor in DPAK (SOT428C) package, designed for automotive-grade load switching and linear-mode voltage regulation. It delivers low VCE(sat) of 0.3 V at IC = 1 A, DC current gain (hFE) of 40–360, and is qualified to AEC-Q101 for under-hood power management applications.
For engineers reviewing the MJD2873-QJ datasheet, MJD2873-QJ pinout, MJD2873-QJ application, or MJD2873-QJ equivalent, this page provides verified thermal resistance (Rth(j-mb) = 9 K/W), peak collector current (ICM = 3 A), junction temperature limit (Tj = 150 °C), and mounting-base-connected collector configuration critical for PCB layout and thermal design.
Technical Context
This NPN transistor operates in active, saturation, and linear modes with base-controlled current amplification. Its low VBE(sat) (≤1.2 V at IC/IB = 20) and fast switching enable efficient on/off control in relay-replacement circuits, while its 15 W junction-to-mounting-base power dissipation supports thermally constrained automotive modules.
The device features electrically similar characteristics to legacy MJD2873 series but adds AEC-Q101 qualification and optimized thermal performance via direct collector-to-mounting-base connection. Its hFE variation across temperature (−55 °C to 150 °C) and pulse-tested parameters ensure robustness in motor drive and constant-current backlighting where ambient extremes occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum allowable collector-emitter voltage with base open; defines safe operating voltage ceiling in 12 V/24 V automotive systems. |
| IC | 2 A continuous - Sustained collector current rating; enables direct driving of medium-power solenoids, fans, or LED strings without external heatsinking. |
| VCE(sat) | 0.3 V max at IC = 1 A - Low saturation voltage minimizes conduction loss and self-heating during switch-on state. |
| hFE | 40–360 - DC current gain range at pulsed conditions; determines required base drive current for reliable saturation across temperature. |
| Rth(j-mb) | 9 K/W - Thermal resistance from junction to mounting base; enables accurate thermal modeling when soldered to copper pad per IPC-7351B footprint. |
| Ptot (j-mb) | 15 W - Total power dissipation capability with mounting base heat sinking; supports linear regulator operation up to ~7.5 W at Tamb = 105 °C. |
| fT | 65 MHz - Transition frequency at VCE = 10 V, IC = 100 mA; confirms suitability for moderate-speed switching (e.g., PWM dimming up to ~500 kHz). |
Pinout & Package
Package: DPAK (SOT428C), surface-mounted plastic package with 3 leads (lead 1 cropped), featuring an exposed metal mounting base electrically connected to the collector terminal for enhanced thermal transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control input; requires ≥50 mA base current to saturate at IC = 2 A (hFE min = 40). |
| 2 | Collector (C) | Main current path input; internally bonded to mounting base (mb) for low-inductance, high-current routing and thermal conduction. |
| 3 | Emiter (E) | Current return path; common reference for load-side grounding in low-side switch configurations. |
| mb | Mounting Base | Electrically tied to collector; must be soldered to ≥1 cm² tin-plated copper pad on FR4 PCB for rated 15 W dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Stress-tested for automotive reliability including temperature cycling, HTRB, and ESD; suitable for engine control, body electronics, and ADAS power stages. |
| Low VCE(sat) | 0.3 V max ensures ≤0.3 W conduction loss at 1 A, reducing thermal load in space-constrained modules like seat control units. |
| High Ptot (j-mb) | 15 W junction-to-mounting-base dissipation enables use as linear pass element in 5 V/2 A regulators without external heatsink. |
| Fast switching | Typical fT = 65 MHz supports clean turn-on/turn-off in PWM-driven motor and backlight applications up to 200 kHz. |
| Thermally optimized DPAK | SOT428C outline includes 6.73 mm × 10.40 mm exposed collector pad; achieves Rth(j-mb) = 9 K/W in free air-critical for under-dash modules. |
Applications
| Automotive Load Switch | Linear Voltage Regulator |
|---|---|
|
Use Scenario: Controlling 12 V cabin lighting or HVAC actuators in vehicles with ambient temperatures up to 105 °C. IC Role / Device Role / Timing Role: NPN power switch operating in saturation mode, driven by microcontroller GPIO with base resistor network. Use Value: Low VCE(sat) (0.3 V) limits power loss to <0.3 W at 1 A, eliminating need for heatsink in compact junction boxes. |
Use Scenario: Providing stable 5 V supply to infotainment sensors where LDO dropout and noise sensitivity are concerns. IC Role / Device Role / Timing Role: Pass transistor in emitter-follower configuration with feedback op-amp controlling base voltage. Use Value: High hFE (up to 360) reduces base drive current demand, improving regulator efficiency and thermal margin at full 2 A load. |
| Constant-Current Backlight Drive | Motor Drive Interface |
|
Use Scenario: Driving CCFL or high-brightness LED strings in instrument clusters requiring precise current regulation. IC Role / Device Role / Timing Role: Linear-mode current source with emitter degeneration resistor and op-amp current sense feedback. Use Value: Tight VBE consistency (±0.05 V typical) across temperature ensures ±3% current accuracy over −40 °C to +125 °C. |
Use Scenario: Replacing electromechanical relays in 24 V wiper or power window control modules. IC Role / Device Role / Timing Role: High-current, low-loss switch interfacing MCU PWM output to brushed DC motor winding. Use Value: 3 A peak collector current (ICM) handles motor inrush without derating; AEC-Q101 qualification ensures 15-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MJD2873T4G | Same VCEO (50 V), IC (2 A), and DPAK package; hFE min = 30 (vs. 40), Rth(j-mb) = 10.5 K/W (vs. 9 K/W). | Lacks AEC-Q101 qualification; not recommended for automotive safety-critical modules. | Select only for cost-sensitive industrial controls where automotive qualification is unnecessary. |
| STMicroelectronics BUW12A | Higher VCEO (100 V), same IC (2 A); TO-220 package (not SMT); Rth(j-c) = 3 K/W but requires mechanical heatsink. | Through-hole mounting increases PCB area; unsuitable for automated SMT assembly lines. | Choose only when higher voltage margin or legacy through-hole compatibility is mandatory. |
Compared with MJD2873-QJ, the MJD2873T4G trades AEC-Q101 compliance and thermal performance for lower cost, while BUW12A sacrifices SMT manufacturability and automotive qualification for higher voltage headroom and discrete heatsinking flexibility.
Availability
MJD2873-QJ is available at Aetrix Electronics and suitable for automotive load switching, linear voltage regulation, constant-current backlight drive, and motor interface applications requiring stable component supply and AEC-Q101 assurance.
Supply support for MJD2873-QJ 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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The MJD2873-QJ belongs to Nexperia's AEC-Q101-qualified high-power bipolar transistor family, engineered specifically for thermally demanding automotive power management functions including load switching and linear regulation.
FAQ
Is MJD2873-QJ pin-compatible with legacy MJD2873 variants?
Yes-MJD2873-QJ uses the identical DPAK (SOT428C) pinout: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter, with mounting base electrically connected to the collector. Electrical characteristics are aligned with the MJD2873 series, and the "-Q" suffix denotes AEC-Q101 qualification without pinout change.
What is the maximum continuous power dissipation on a standard FR4 PCB?
When mounted on a single-sided FR4 PCB with 70 µm copper and a 1 cm² tin-plated collector pad, MJD2873-QJ achieves 1.6 W total power dissipation (Ptot). This value drops linearly above 25 °C ambient per the derating curve in Figure 1, reaching ~0.8 W at 100 °C ambient.
Can MJD2873-QJ be used in linear regulator configurations?
Yes-its 15 W junction-to-mounting-base power rating, low VCE(sat), and stable hFE across temperature make it suitable as a pass transistor in adjustable linear regulators. Designers must ensure mounting base thermal coupling to ≥1 cm² copper and limit junction temperature to 150 °C using the provided Rth(j-mb) = 9 K/W.
Does MJD2873-QJ require a heatsink for 2 A continuous operation?
No external heatsink is required if the mounting base is soldered to a ≥1 cm² tin-plated copper pad on FR4. At 2 A and VCE = 0.3 V, power dissipation is 0.6 W-well within the 1.6 W ambient-rated limit. For linear-mode operation at higher VCE, thermal design must verify Tj ≤ 150 °C using Rth(j-mb) and pad thermal resistance.
MJD2873-QJ 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:
- NPN
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 50mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 500mA, 2V
- Power - Max:
- 1.6 W
- Frequency - Transition:
- 65MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD2873-QJ FAQ
1.How can I place an order for MJD2873-QJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD2873-QJ 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 MJD2873-QJ reliable?
The price and inventory of MJD2873-QJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD2873-QJ is usually 5 days.
3.What payment methods are accepted for MJD2873-QJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD2873-QJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD2873-QJ?
MJD2873-QJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD2873-QJ 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 MJD2873-QJ?
For technical support, including MJD2873-QJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD2873-QJ requirements.
6.How does Aetrix verify that MJD2873-QJ is sourced from the original manufacturer or authorized distributors?
All MJD2873-QJ 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 MJD2873-QJ meets industry standards.
7.What is the process for return or replacement of MJD2873-QJ?
All MJD2873-QJ units undergo pre-shipment inspection (PSI). If there is an issue with MJD2873-QJ, 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 MJD2873-QJ part is unused and in its original packaging.
Return procedure for MJD2873-QJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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