My Inquiry
My Account
Nexperia USA Inc. MJD42C-QJ
- Part No.:
- MJD42C-QJ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD42C-QJ.pdf
- Description:
- TRANS PNP 100V 6A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MJD42C-QJ from Nexperia is a PNP high-power bipolar transistor in DPAK (SOT428C) package, rated for −100 V VCEO, −6 A continuous collector current, and 15 W junction-to-mounting-base power dissipation. It serves as a robust load switch or linear regulator pass device in automotive power management systems, delivering low −1.5 V VCE(sat) at −6 A/−600 mA drive and qualified to AEC-Q101.
For engineers reviewing the MJD42C-QJ datasheet, MJD42C-QJ pinout, MJD42C-QJ application, or MJD42C-QJ equivalent, this page provides verified electrical parameters, thermal derating curves, mounting-base thermal resistance (9 K/W), and automotive-grade reliability context - critical for high-current switching, relay replacement, and constant-current backlight driver designs.
Technical Context
This PNP bipolar transistor operates in active, saturation, and linear modes with DC current gain (hFE) of 15 min at −3 A and 30 min at −0.3 A under pulsed conditions. Its low −2 V VBE at −6 A enables efficient base drive with standard logic-level drivers.
Thermal design centers on the metal mounting base (pin 2, connected to collector), which provides 9 K/W junction-to-mounting-base resistance in free air and supports up to 15 W dissipation when properly heatsinked. Transient thermal impedance data confirms suitability for repetitive pulse loads with duty cycles ≤ 0.02.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −100 V: Maximum safe collector-emitter voltage with base open; defines breakdown margin in high-side switch or linear regulator applications. |
| IC | −6 A continuous: Rated DC collector current at Tmb ≤ 25 °C; sets maximum steady-state load capability without forced cooling. |
| VCE(sat) | −1.5 V max at IC = −6 A, IB = −600 mA: Low saturation voltage minimizes conduction loss and heat generation in switching mode. |
| hFE | 15 min at IC = −3 A: Ensures reliable base drive sizing for high-current switching without excessive base current overhead. |
| Rth(j-mb) | 9 K/W: Thermal resistance from junction to mounting base; enables direct heatsinking via PCB copper pad or mechanical heatsink attachment. |
| Ptot (Tmb ≤ 25 °C) | 15 W: Total power dissipation limit when mounting base temperature is maintained at or below 25 °C; governs thermal layout requirements. |
| AEC-Q101 Qualified | Qualified per Automotive Electronics Council stress test standard; supports deployment in engine control, body electronics, and ADAS power stages. |
Pinout & Package
Package: DPAK (SOT428C), surface-mounted plastic package with exposed metal mounting base (pin 2) electrically connected to the collector for thermal and electrical integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; accepts negative base current to turn on PNP device; requires current-limiting resistor in series with driving source. |
| 2 | Collector (C) / Mounting Base (mb) | Main high-current output terminal and thermally conductive interface; must be soldered to ≥1 cm² tin-plated copper pad for rated 15 W dissipation. |
| 3 | Emitter (E) | Power return path; connects to system ground or positive rail depending on circuit topology (e.g., high-side switch emitter to battery +). |
Key Features
| Feature | Design Value |
|---|---|
| High thermal power dissipation | 15 W junction-to-mounting-base rating enables compact, heatsink-free designs in automotive modules with adequate PCB copper area. |
| Low VCE(sat) | −1.5 V max at full −6 A load reduces conduction loss to <10 W, lowering thermal stress and improving system efficiency. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing - eliminates need for additional qualification effort in Tier-1 designs. |
| Fast switching speeds | Transition frequency fT ≥ 3 MHz and typical switching times support PWM frequencies up to ~100 kHz in motor drive and backlight dimming. |
| Electrically similar to MJD42 series | Drop-in compatibility with legacy MJD42C footprints and drive requirements simplifies upgrade paths in existing production boards. |
Applications
| Automotive Power Management | Linear Mode Voltage Regulator |
|---|---|
|
Use Scenario: Controlling 12 V/24 V auxiliary loads (e.g., HVAC actuators, lighting modules) in engine bay or cabin environments. IC Role / Device Role / Timing Role: High-side PNP switch with collector tied to battery and emitter feeding load; driven by microcontroller GPIO through base resistor. Use Value: −100 V rating provides margin against load-dump transients; AEC-Q101 qualification ensures reliability across −40 °C to +150 °C ambient. |
Use Scenario: Adjustable constant-voltage supply for analog sensors or infotainment subsystems requiring low-noise, ripple-free output. IC Role / Device Role / Timing Role: Pass transistor in series-regulator topology, dissipating excess voltage as heat while maintaining precise output setpoint. Use Value: 15 W thermal rating and 9 K/W Rth(j-mb) allow stable operation at >2 W dissipation using only PCB copper heatsinking. |
| Constant Current Backlight Drive | Relay Replacement |
|
Use Scenario: Driving LED strings in instrument clusters or center displays with precise current regulation independent of forward voltage variation. IC Role / Device Role / Timing Role: Current-sink element controlled by op-amp feedback loop; emitter grounded, collector connected to LED cathode. Use Value: hFE ≥ 15 at −3 A ensures stable closed-loop gain; low VCE(sat) minimizes headroom requirement and improves efficiency. |
Use Scenario: Solid-state replacement for electromechanical relays controlling fuel pumps, radiator fans, or window lift motors. IC Role / Device Role / Timing Role: High-current switching element handling inductive loads up to 6 A; includes flyback diode protection externally. Use Value: −10 A peak collector current rating accommodates relay coil inrush and motor startup surges without secondary overcurrent protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD42C | No AEC-Q101 qualification; identical electrical specs and package; lower screening cost. | Suitable for industrial or consumer applications where automotive qualification is not required. | Select when automotive reliability certification is unnecessary and cost sensitivity is higher. |
| STP16PF06 | PNP MOSFET (not BJT); VDSS = −60 V, ID = −16 A; gate-driven, no base current needed. | Better for high-frequency PWM due to voltage-mode control; less sensitive to temperature-induced gain drift. | Choose for >100 kHz switching or when minimizing base drive complexity outweighs conduction loss trade-off. |
Compared with MJD42C-QJ, MJD42C lacks automotive qualification but matches all electrical ratings, while STP16PF06 offers higher current and voltage-mode control at lower VDS(on) but requires different gate-drive design and has reduced voltage margin (−60 V vs −100 V).
Availability
MJD42C-QJ is available at Aetrix Electronics and suitable for automotive power management, linear voltage regulation, and constant-current backlight drive applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for MJD42C-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 essential semiconductors, delivering high-performance, reliable discrete, logic, and MOSFET devices for automotive, industrial, and consumer markets.
MJD42C-QJ belongs to Nexperia's AEC-Q101-qualified high-power bipolar transistor family, engineered specifically for robust, thermally efficient switching and linear regulation in harsh automotive environments.
FAQ
What is the maximum allowable mounting base temperature for continuous 6 A operation?
The datasheet specifies a maximum junction temperature of 150 °C and Rth(j-mb) = 9 K/W. For −6 A continuous operation with VCE(sat) ≈ −1.5 V, power dissipation is ~9 W. To stay within Tj ≤ 150 °C, Tmb must not exceed 150 − (9 × 9) = 69 °C. Therefore, sustained 6 A operation requires Tmb ≤ 69 °C.
Can MJD42C-QJ be used in parallel configurations for higher current?
Yes, but with strict matching and external emitter resistors. The device exhibits positive temperature coefficient for VCE(sat), supporting current sharing; however, hFE variation (15–30) and thermal coupling differences require individual 0.1 Ω emitter resistors and symmetrical PCB layout to ensure balanced current distribution up to ±15% mismatch.
Is the mounting base (pin 2) electrically isolated from other pins?
No - the mounting base is internally connected to the collector (pin 2). This is explicitly stated in the pinning table and package outline. Any heatsink or thermal pad contacting the base must be electrically isolated from other circuit nodes unless intentionally tied to the collector potential, as required by the application topology.
Does MJD42C-QJ support pulsed operation beyond its DC current rating?
Yes - the datasheet specifies ICM = −10 A for single pulses ≤ 1 ms. At 200 µs pulse width and 2% duty cycle, it supports −10 A peak current with junction temperature rise limited by transient thermal impedance (Zth(j-a) ≈ 15 K/W at 200 µs). Derating is required above 2% duty cycle per Figure 2.
MJD42C-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:
- PNP
- Current - Collector (Ic) (Max):
- 6 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 600mA, 6A
- Current - Collector Cutoff (Max):
- 1µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 30 @ 300mA, 4V
- Power - Max:
- 1.6 W
- Frequency - Transition:
- 3MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD42C-QJ FAQ
1.How can I place an order for MJD42C-QJ through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD42C-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 MJD42C-QJ reliable?
The price and inventory of MJD42C-QJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD42C-QJ is usually 5 days.
3.What payment methods are accepted for MJD42C-QJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD42C-QJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD42C-QJ?
MJD42C-QJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD42C-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 MJD42C-QJ?
For technical support, including MJD42C-QJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD42C-QJ requirements.
6.How does Aetrix verify that MJD42C-QJ is sourced from the original manufacturer or authorized distributors?
All MJD42C-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 MJD42C-QJ meets industry standards.
7.What is the process for return or replacement of MJD42C-QJ?
All MJD42C-QJ units undergo pre-shipment inspection (PSI). If there is an issue with MJD42C-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 MJD42C-QJ part is unused and in its original packaging.
Return procedure for MJD42C-QJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MJD42C-QJ Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
