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onsemi MJD127T4
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- Part No.:
- MJD127T4
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MJD127T4.pdf
- Description:
- TRANS PNP DARL 100V 8A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,033
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Product details
Overview
MJD127T4 from onsemi is a PNP complementary Darlington power transistor in DPAK surface-mount package, rated for 8 A continuous collector current, 100 V collector-emitter voltage, and 20 W power dissipation at TC = 25 °C. It features monolithic construction with built-in base-emitter shunt resistors, high DC current gain (hFE = 1000–12,000), and AEC-Q101 qualification for automotive-grade reliability in low-speed switching and general-purpose amplifier circuits.
For engineers reviewing the MJD127T4 datasheet, pinout, applications, or equivalent options, this device serves as a surface-mount replacement for legacy TIP125–TIP127 series transistors in motor drivers, relay drivers, and linear power supply pass elements-where high current gain, robust thermal performance (RJC = 6.25 °C/W), and Pb-free RoHS compliance are required.
Technical Context
The MJD127T4 integrates two PNP transistors in Darlington configuration with internal base-emitter shunt resistors, enabling simplified biasing and improved turn-off behavior. Its electrical characteristics are specified at TC = 25 °C and include VCE(sat) ≤ 4 V at IC = 8 A / IB = 80 mA and VBE(sat) ≤ 4.5 V under the same conditions.
Thermal design relies on junction-to-case conduction (RJC = 6.25 °C/W) and requires minimum recommended PCB pad area to achieve rated 20 W dissipation; at ambient mounting (TA = 25 °C), derated power drops to 1.75 W (RJA = 71.4 °C/W). Safe operating area (SOA) curves define second-breakdown and thermal limits across pulse widths from 1 ms to DC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 Vdc - Maximum blocking voltage between collector and emitter with base open; defines maximum supply rail compatibility in switching applications. |
| IC (continuous) | 8 Adc - Continuous collector current rating at TC = 25 °C; determines load-handling capability in DC motor or solenoid drivers. |
| PD @ TC = 25 °C | 20 W - Total power dissipation limit when mounted on thermally optimized PCB; requires heatsinking or forced-air cooling above ~3 W at ambient. |
| hFE (min/max) | 1000 / 12,000 - DC current gain range at IC = 4–8 A; enables low-base-drive-current operation in high-gain amplifier or switch stages. |
| VCE(sat) | ≤ 4 Vdc @ IC = 8 A, IB = 80 mA - Saturation voltage defining conduction loss; contributes ~32 W worst-case power loss if uncooled at full current. |
| RJC | 6.25 °C/W - Junction-to-case thermal resistance; dictates minimum heatsink interface requirement for thermal management below 150 °C junction temperature. |
| AEC-Q101 | Qualified - Meets stress-test requirements for automotive electronics; supports PPAP documentation for OEM production programs. |
Pinout & Package
DPAK-3 (Case 369C, Style 1) surface-mount package with 4-pin outline (pins 1–4); pins 2 and 4 are internally connected to collector, pin 1 is base, pin 3 is emitter. Requires minimum copper pad area per datasheet page 7 for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input terminal; accepts base current to drive Darlington pair; internal shunt resistor aids turn-off. |
| Pin 2 | Collector | Main high-current output node; electrically tied to Pin 4 for enhanced current handling and thermal path. |
| Pin 3 | Emiter | Power return path; connects to system ground or negative rail in high-side switch configurations. |
| Pin 4 | Collector | Second collector connection; paralleled with Pin 2 to reduce bond-wire resistance and improve thermal conduction to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington + shunt resistors | Eliminates external base pull-down components and improves switching consistency in relay/motor control. |
| hFE = 2500 (typ) @ IC = 4 A | Reduces required base drive current by >10× versus single bipolar transistors, easing microcontroller GPIO sourcing. |
| VCEO = 100 V, IC = 8 A | Supports 24–48 V industrial bus systems with margin for inductive kickback in solenoid and DC motor loads. |
| AEC-Q101 qualified & NJV prefix option | Enables direct use in automotive body control modules (BCM), seat/mirror actuators, and HVAC blower circuits. |
| Pb-free, Halogen-free, RoHS compliant | Meets global environmental compliance mandates without derating or process change for lead-free reflow assembly. |
Applications
| DC Motor Driver | Relay Driver Circuit |
|---|---|
|
Use Scenario: Driving 24 V, 5 A brushed DC motors in industrial automation conveyors. IC Role / Device Role / Timing Role: High-current PNP Darlington switch controlling motor direction via H-bridge half-bridge configuration. Use Value: Delivers 8 A peak current with <4 V saturation drop, minimizing heat generation and enabling compact heatsink design. |
Use Scenario: Replacing mechanical relays in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: Solid-state switch interfacing PLC microcontroller outputs to 12–48 V AC/DC loads (valves, indicators). Use Value: Eliminates contact wear and bounce; supports >1 million cycles with no moving parts and fast turn-on (<10 µs). |
| Linear Regulator Pass Element | Automotive Body Control Module |
|
Use Scenario: Adjustable 5–12 V linear regulator delivering up to 3 A for analog sensor subsystems. IC Role / Device Role / Timing Role: Series pass transistor regulating output voltage under feedback control from op-amp error amplifier. Use Value: High hFE reduces base drive burden on error amplifier; RJC = 6.25 °C/W enables stable operation with minimal heatsinking. |
Use Scenario: Controlling window lift motors and mirror adjustment actuators in AEC-Q101-compliant vehicle platforms. IC Role / Device Role / Timing Role: Load switch in BCM power distribution network, driven by CAN/LIN microcontroller PWM outputs. Use Value: Qualified to AEC-Q101 with PPAP support ensures supply chain traceability and failure rate compliance for safety-critical functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD127G | DPAK package, 75-unit rail packaging vs. MJD127T4's 2500-unit tape-and-reel; identical electrical specs and thermal ratings. | Suitable for prototyping and low-volume builds; lacks reel logistics for SMT line integration. | Select MJD127G for bench validation; MJD127T4 for automated assembly and production ramp. |
| TIP127 | TO-220 through-hole package; same VCEO, IC, hFE ratings but higher RJA (~62.5 °C/W) and no AEC-Q101 qualification. | Limited to non-automotive, non-SMT designs where manual assembly or retrofitting legacy boards is required. | Choose TIP127 only when board layout prohibits surface-mount components or AEC-Q101 is not mandated. |
Compared with MJD127G and TIP127, the MJD127T4 provides production-ready tape-and-reel delivery, AEC-Q101 qualification, and optimized thermal performance for automated SMT manufacturing-making it the preferred choice for volume automotive and industrial applications requiring long-term supply stability and compliance assurance.
Availability
MJD127T4 is available at Aetrix Electronics and suitable for DC motor drivers, relay driver circuits, and linear regulator pass elements requiring stable component supply, automotive-grade qualification, and surface-mount manufacturability.
Supply support for MJD127T4 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 is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MJD127T4 belongs to onsemi's complementary Darlington power transistor family, designed specifically for robust, high-gain switching in space-constrained surface-mount power control applications-from automotive body electronics to industrial motion control.
FAQ
What is the maximum continuous collector current rating for MJD127T4?
The MJD127T4 is rated for 8 A continuous collector current at case temperature TC = 25 °C. This rating assumes proper PCB copper area per datasheet page 7 and derates linearly at 0.16 W/°C above 25 °C. At ambient mounting (TA = 25 °C), the continuous rating drops to 1.75 A due to higher thermal resistance (RJA = 71.4 °C/W). Always verify SOA curves in Figure 12 for pulsed operation.
Is MJD127T4 pin-compatible with TIP127?
No, MJD127T4 is not pin-compatible with TIP127. The MJD127T4 uses a DPAK-3 surface-mount package (pins 1–4: Base, Collector, Emitter, Collector), while TIP127 uses TO-220 through-hole packaging with different pinout (Emitter, Base, Collector). Though both are PNP Darlington transistors with identical electrical ratings, mechanical and soldering requirements differ significantly-requiring PCB redesign for substitution.
Does MJD127T4 have built-in base-emitter resistors?
Yes, the MJD127T4 features monolithic construction with built-in base-emitter shunt resistors. As confirmed in the datasheet Features section and Figure 13 schematic, these resistors provide automatic turn-off biasing, reducing external component count and improving switching consistency in relay and motor driver applications.
What is the safe operating area (SOA) limitation for MJD127T4 at 100 V?
At VCE = 100 V, the MJD127T4's SOA is limited by second breakdown to ≤ 0.1 A for DC operation (Figure 12). For 1 ms pulses, maximum current rises to ~1.5 A; for 10 ms, ~0.5 A. These limits assume TJ(pk) ≤ 150 °C and proper thermal management. Exceeding SOA risks irreversible device failure even if average power appears within rating.
Is MJD127T4 suitable for automotive applications?
Yes, the MJD127T4 is AEC-Q101 qualified and offered with NJV prefix (NJVMJD127T4G*) for automotive applications requiring PPAP documentation and controlled change management. Its construction, thermal performance, and qualification testing make it suitable for body control modules, seat/mirror actuators, and HVAC blower drivers in passenger vehicles and commercial platforms.
MJD127T4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 8 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 4V @ 80mA, 8A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 1000 @ 4A, 4V
- Power - Max:
- 1.75 W
- Frequency - Transition:
- 4MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MJD127T4 FAQ
1.How can I place an order for MJD127T4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MJD127T4 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 MJD127T4 reliable?
The price and inventory of MJD127T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD127T4 is usually 5 days.
3.What payment methods are accepted for MJD127T4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD127T4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJD127T4?
MJD127T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJD127T4 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 MJD127T4?
For technical support, including MJD127T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD127T4 requirements.
6.How does Aetrix verify that MJD127T4 is sourced from the original manufacturer or authorized distributors?
All MJD127T4 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 MJD127T4 meets industry standards.
7.What is the process for return or replacement of MJD127T4?
All MJD127T4 units undergo pre-shipment inspection (PSI). If there is an issue with MJD127T4, 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 MJD127T4 part is unused and in its original packaging.
Return procedure for MJD127T4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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