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onsemi MR4027P
- Part No.:
- MR4027P
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
MR4027P.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:9,900
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Product details
Overview
MR4027P from ON Semiconductor is an automotive-grade transient voltage suppressor diode with reverse avalanche capability, rated for 20–27 V breakdown, 40 A average forward current, and 500 A non-repetitive surge current; designed for centralized protection in alternator circuits and load-dump transient suppression.
For engineers reviewing the MR4027P datasheet, pinout, applications, or equivalent options, key selection criteria include its 200°C max junction temperature, 0.4°C/W thermal resistance, 1.1 V forward voltage at 100 A, 16 V reverse leakage limit, and case-193A button-can package with cathode-to-cup polarity.
Technical Context
This device operates bidirectionally: as a standard rectifier in forward bias (VF ≤ 1.1 V @ 100 A), and as a clamping TVS in reverse avalanche mode (V(BR) = 20–27 V @ 100 mA). Its 200°C TJ rating and low RθJC enable high-power automotive mounting on heat sinks.
Breakdown voltage increases with temperature (0.095%/°C), while forward voltage decreases (−2 mV/°C), supporting stable performance across −40°C to +200°C ambient operation in alternator and battery-line protection systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 20–27 V @ 100 mA - defines clamping threshold for load-dump transients |
| Average Forward Current | 40 A @ TC = 185°C - supports continuous rectification in high-current alternator output paths |
| Non-Repetitive Surge Current | 500 A @ 50 Hz half-wave - withstands single-event load-dump pulses per ISO 7637-2 |
| Thermal Resistance | 0.4 °C/W junction-to-case - enables direct heatsink mounting without thermal derating penalties |
| Max Junction Temperature | 200°C - allows operation under hood temperatures exceeding 150°C ambient |
| Reverse Leakage | ≤1.0 A @ 16 V, 25°C - ensures low standby power loss in always-on vehicle systems |
Pinout & Package
MR4027P uses the CASE 193A button-can package with cathode connected to the metal cup (P-suffix designation). The device has two terminals: cathode (cup) and anode (center lead).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Metal Cup) | Clamping Node / Heat Sink Interface | Provides low-inductance path to ground during avalanche; serves as primary thermal conduction surface |
| Anode (Center Lead) | Input / Line Terminal | Connects to alternator output or battery line; carries full forward and surge current |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Avalanche Capability | Enables bidirectional transient suppression without external circuitry - eliminates need for back-to-back diode stacks |
| 200°C Maximum Junction Temperature | Supports placement near high-heat sources (e.g., engine bay, alternator housing) without thermal shutdown |
| 0.4°C/W Thermal Resistance | Permits direct mounting to chassis or heatsink with minimal thermal interface material - reduces system-level cooling cost |
| 500 A IFSM Rating | Meets ISO 7637-2 Pulse 5a (load dump) requirements without series fusing or derating |
Applications
| Alternator Output Protection | Battery Line Transient Suppression |
|---|---|
Use Scenario: Installed between alternator output and main vehicle battery to absorb ISO 7637-2 load-dump pulses up to 120 V. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor operating in reverse avalanche mode during overvoltage events. Use Value: Clamps peak voltage to ≤27 V, protecting downstream ECUs, infotainment, and lighting modules from destructive energy. | Use Scenario: Placed at battery input of body control module (BCM) to suppress switching transients from solenoid loads. IC Role / Device Role / Timing Role: High-energy clamping diode absorbing repetitive 100–500 A surges with <100 ns response time. Use Value: Prevents latch-up and gate oxide damage in 5 V/3.3 V power rails by limiting dv/dt and peak voltage excursion. |
| Centralized Power Distribution Unit | Engine Control Unit (ECU) Input Protection |
Use Scenario: Mounted on main fuse box PCB to protect multiple downstream branches from shared alternator transients. IC Role / Device Role / Timing Role: Centralized TVS element sharing thermal mass across multiple protected lines via common heatsink. Use Value: Reduces BOM count vs. discrete TVS per branch while maintaining 500 A single-pulse capability and 200°C reliability. | Use Scenario: Integrated into ECU power entry stage to guard against reverse-battery connection and load-dump coupling. IC Role / Device Role / Timing Role: Dual-function rectifier/TVS providing forward conduction during normal operation and reverse clamping during faults. Use Value: Eliminates need for separate reverse-polarity protection diode and TVS, saving board space and assembly cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppressor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH6004D | 400 V VR, 60 A IF, no specified avalanche rating - optimized for fast recovery, not clamping | Lacks reverse avalanche capability; unsuitable for load-dump suppression | Select only for pure rectification where clamping is handled separately |
| SMCJ24A | 24 V VBR, 1500 W peak power, DO-214AB package - lower surge current (100 A Ipp), higher capacitance | Surface-mount, lower thermal mass - limited to low-energy transients and PCB-only mounting | Prefer for space-constrained modules where heatsinking is impractical |
Compared with STTH6004D and SMCJ24A, MR4027P uniquely combines 500 A surge handling, 200°C junction rating, and reverse avalanche clamping in a thermally robust button-can package - making it the only option qualified for centralized alternator-side protection in modern 12 V automotive architectures.
Availability
MR4027P is available at Aetrix Electronics and suitable for automotive alternator protection, battery-line transient suppression, and centralized power distribution units requiring stable component supply across extended vehicle lifecycles.
Supply support for MR4027P 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
ON Semiconductor is a global semiconductor manufacturer specializing in automotive, industrial, and power solutions, with leadership in high-reliability discrete and analog components.
The MR4027P belongs to ON Semiconductor's automotive TVS diode product line, engineered specifically for ISO 7637-2 load-dump compliance and under-hood thermal resilience in 12 V vehicle electrical systems.
FAQ
What is the polarity configuration of MR4027P?
The MR4027P uses a P-suffix configuration, meaning the cathode is electrically connected to the metal cup (case), and the anode is the center lead. This design enables direct thermal coupling to a heatsink through the cathode terminal while maintaining correct polarity for reverse-biased clamping in automotive battery-line applications. Always verify orientation during PCB layout to avoid reverse mounting.
Does MR4027P meet ISO 7637-2 Pulse 5a requirements?
Yes, MR4027P meets ISO 7637-2 Pulse 5a (load dump) requirements due to its 500 A non-repetitive peak surge current rating and 20–27 V breakdown voltage range. When mounted with adequate thermal mass, it clamps the 120 V/400 ms pulse to safe levels for downstream electronics. Its 200°C junction rating ensures sustained operation during repeated test cycles without degradation.
Can MR4027P be used as a standard rectifier?
Yes, MR4027P functions as a standard rectifier in forward bias with 40 A average forward current capability at TC = 185°C and ≤1.1 V forward voltage at 100 A. Its low VF and high thermal tolerance make it suitable for alternator output rectification, but its primary design intent remains transient suppression - verify forward conduction losses in your specific thermal environment before using solely as a rectifier.
What is the thermal resistance of MR4027P, and how does it affect heatsink design?
MR4027P has a thermal resistance of 0.4°C/W from junction to case. This low value means that for every watt of power dissipated, the junction rises only 0.4°C above the case temperature. To maintain TJ ≤ 200°C at maximum surge, the heatsink must keep the case below ~120°C under worst-case ambient and airflow conditions. Use thermal interface material and ensure mechanical pressure for optimal contact.
Is MR4027P RoHS compliant and PPAP capable?
MR4027P is RoHS compliant per ON Semiconductor's published environmental documentation and qualifies for Production Part Approval Process (PPAP) Level 3 submission. It carries full automotive qualification per AEC-Q101, including HTGB, HTRB, and temperature cycling tests. Traceability data, material declarations, and test reports are available upon request for MR4027P procurement.
MR4027P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MR4027P FAQ
1.How can I place an order for MR4027P through Aetrix?
Please submit a Request for Quotation (RFQ) for MR4027P 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 MR4027P reliable?
The price and inventory of MR4027P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MR4027P is usually 5 days.
3.What payment methods are accepted for MR4027P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MR4027P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MR4027P?
MR4027P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MR4027P 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 MR4027P?
For technical support, including MR4027P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MR4027P requirements.
6.How does Aetrix verify that MR4027P is sourced from the original manufacturer or authorized distributors?
All MR4027P 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 MR4027P meets industry standards.
7.What is the process for return or replacement of MR4027P?
All MR4027P units undergo pre-shipment inspection (PSI). If there is an issue with MR4027P, 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 MR4027P part is unused and in its original packaging.
Return procedure for MR4027P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MR4027P Tags
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