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Microchip Technology MPLAD18KP11A
- Part No.:
- MPLAD18KP11A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP11A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,978
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Product details
Overview
MPLAD18KP11A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 11 V reverse standoff voltage (VWM), clamps to ≤18.2 V at 989 A peak current, and exhibits <100 ps response time. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for aircraft avionics.
For engineers reviewing the MPLAD18KP11A datasheet, MPLAD18KP11A pinout, MPLAD18KP11A application, or MPLAD18KP11A equivalent, key selection criteria include its 11 V VWM rating, 12.2–13.5 V breakdown range, 18.2 V max clamping voltage at 989 A, thermal resistance of 0.7 °C/W junction-to-case, and compliance with IEC 61000-4-5 (Class 1–5, 42 Ω source) and DO-160F Waveform 4.
Technical Context
The MPLAD18KP11A employs an avalanche diode structure optimized for low clamping ratio and minimal thermal resistance. Its metal-base package enables direct heatsinking, supporting sustained multi-stroke surge events per RTCA DO-160 Section 22. The device operates within –55 °C to +150 °C junction temperature range and maintains stable breakdown voltage with ±10 mV/°C temperature coefficient.
It is rated for 100% surge testing per lot, with 3σ screening on standby current (ID ≤10 μA @ 11 V), and supports both FR4 PCB mounting (RθJA = 50 °C/W) and heatsink-integrated thermal management (RθJC = 0.7 °C/W). Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains lightning-level surges without failure in aircraft and automotive load-dump scenarios |
| Reverse Standoff Voltage (VWM) | 11 V - maximum continuous operating voltage before conduction begins; matches 12 V nominal bus systems |
| Breakdown Voltage (V(BR)) | 12.2–13.5 V @ I(BR) - ensures reliable turn-on margin above VWM while avoiding false triggering |
| Max Clamping Voltage (VC) | 18.2 V @ 989 A - limits downstream voltage stress to safe levels for 15 V-rated ICs and controllers |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to heatsink or copper pour, critical for repeated surge duty cycles |
| Response Time | <100 ps - provides sub-nanosecond protection against fast-rising ESD and RFI-induced transients |
| Steady-State Power Dissipation | 2.5 W @ TA = 25°C - defines continuous bias capability during non-surge conditions |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode termination. Void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; polarity marked - cathode is the metal base (bottom side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top-side lead) | Transient current entry point | Connected to protected line (e.g., 12 V rail); conducts surge current toward cathode during overvoltage |
| Cathode (Metal base) | Transient current return path / heatsink interface | Electrically and thermally connected to ground plane or heatsink; serves dual role in clamping and thermal management |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device secondary lightning protection per IEC 61000-4-5 Class 1–5 (42 Ω source) without parallel staging |
| Low-profile PLAD package with metal base | Reduces thermal resistance to 0.7 °C/W and allows direct PCB heatsinking - eliminates need for discrete thermal pads or clips |
| AEC-Q101 qualification & lot traceability | Supports automotive under-hood applications requiring zero-defect reliability and full wafer/assembly lot tracking |
| RTCA DO-160F Waveform 4 Level 4 compliance | Validated for pin-injection transients (6.4/69 μs) in airborne equipment - meets FAA/EASA certification requirements |
| Moisture Sensitivity Level 1 | Eliminates baking and dry-pack handling - reduces manufacturing cost and avoids moisture-related popcorning during reflow |
Applications
| Aircraft Avionics Power Input | Automotive 12 V Load Dump Protection |
|---|---|
Use Scenario: Protecting flight control computers and sensor interfaces from induced lightning transients on 28 V DC distribution buses. IC Role / Device Role / Timing Role: Primary secondary surge clamp at board-level input filter stage, placed upstream of DC/DC converters and LDOs. Use Value: Meets RTCA DO-160 Section 22 multi-stroke lightning standard with no derating up to 150 °C case temperature. |
Use Scenario: Safeguarding infotainment ECUs and ADAS modules during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS placed across battery input rails to clamp 120 V/400 ms transients to ≤18.2 V. Use Value: Withstands ≥1000 surge cycles at 989 A without parameter shift - exceeds OEM lifetime requirements. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: Suppressing switching transients generated by IGBT inverters feeding AC motors in factory automation systems. IC Role / Device Role / Timing Role: High-power TVS mounted directly on copper busbar to absorb commutation spikes before reaching gate drivers. Use Value: 0.7 °C/W RθJC enables direct thermal coupling to busbar - maintains clamping performance across 10,000+ surge events. |
Use Scenario: Securing 110 V DC signaling power inputs in trackside cabinets exposed to induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Secondary protection element after gas discharge tube (GDT), limiting let-through voltage to safe levels for PLC I/O circuits. Use Value: Complies with EN 50121-4 for railway EMC; clamps 4 kV/2 Ω IEC 61000-4-5 surges to <20 V within 100 ps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ11A | Lower PPP rating (400 W), smaller SMC package, RθJA = 40 °C/W, no AEC-Q101 or DO-160 qualification | Suitable for consumer-grade 12 V systems only; not rated for multi-stroke lightning or automotive under-hood use | Select when cost and board space constrain design, and surge energy remains below 1 kA/10/1000 μs |
| Vishay V18MLA1103NH | MLA varistor-based; 18 kW rating but higher clamping (≈25 V), slower response (>1 ns), no defined VWM or V(BR) | Better for high-current, low-frequency surges (e.g., AC mains); less precise for DC bus clamping where voltage margin is tight | Prefer for hybrid AC/DC protection where clamping precision is secondary to energy absorption capacity |
Compared with SMAJ11A and V18MLA1103NH, the MPLAD18KP11A uniquely combines aerospace-grade qualification, nanosecond response, tightly specified VWM/V(BR)/VC parameters, and metal-base thermal performance - making it the only choice for safety-critical 12 V DC systems requiring repeatable, low-clamp, high-reliability surge suppression.
Availability
MPLAD18KP11A is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECU power inputs, and industrial motor drive DC bus protection requiring stable component supply across extended product lifecycles.
Supply support for MPLAD18KP11A 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and power solutions for aerospace, defense, and industrial markets.
The MPLAD18KP11A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load-dump protection in mission-critical platforms where thermal stability, parameter consistency, and regulatory compliance are non-negotiable.
FAQ
What is the maximum clamping voltage of the MPLAD18KP11A at its rated peak pulse current?
The MPLAD18KP11A has a maximum clamping voltage (VC) of 18.2 V at 989 A peak pulse current under 10/1000 μs waveform conditions. This value is guaranteed across temperature and ensures downstream 15 V-rated components remain within safe operating limits during surge events. The MPLAD18KP11A achieves this with low dynamic impedance and optimized junction layout.
Is the MPLAD18KP11A qualified for automotive under-hood applications?
Yes, the MPLAD18KP11A is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C junction temperature. Its metal-base PLAD package provides robust thermal performance in high-ambient environments, and its 100% lot surge testing ensures reliability in automotive load-dump and ISO 7637-2 Pulse 5a scenarios. The MPLAD18KP11A is explicitly referenced in Microsemi's automotive compliance documentation.
Does the MPLAD18KP11A meet RTCA DO-160F lightning protection requirements?
Yes, the MPLAD18KP11A is certified for RTCA DO-160F Section 22 multi-stroke lightning testing and supports Waveform 4 (6.4/69 μs) Level 4 pin injection protection. It is listed among qualified parts for aircraft power input stages, with validated performance up to 150 °C case temperature. The MPLAD18KP11A's low response time (<100 ps) and stable clamping make it suitable for avionics-grade surge suppression.
What is the thermal resistance from junction to case for the MPLAD18KP11A, and why does it matter?
The MPLAD18KP11A has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. This low value enables efficient heat transfer from the silicon die to the metal base, allowing direct mounting to heatsinks or large copper pours. In high-duty-cycle surge applications - such as repetitive lightning strikes or frequent load dumps - this thermal path prevents junction overheating and parameter drift, ensuring consistent clamping performance across the MPLAD18KP11A's operational lifetime.
How does the MPLAD18KP11A differ from bidirectional variants like MPLAD18KP11CA?
The MPLAD18KP11A is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V positive rail to ground), offering lower leakage and tighter V(BR) tolerance. The MPLAD18KP11CA is bidirectional, suited for AC or floating signal lines, with symmetrical clamping in both directions but slightly higher ID and broader V(BR) spread. The MPLAD18KP11A's cathode is the metal base - a key layout consideration absent in CA variants.
MPLAD18KP11A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 989A
- Power - Peak Pulse:
- 18000W (18kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PLAD
MPLAD18KP11A FAQ
1.How can I place an order for MPLAD18KP11A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP11A 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 MPLAD18KP11A reliable?
The price and inventory of MPLAD18KP11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP11A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP11A?
MPLAD18KP11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP11A 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 MPLAD18KP11A?
For technical support, including MPLAD18KP11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP11A requirements.
6.How does Aetrix verify that MPLAD18KP11A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP11A 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 MPLAD18KP11A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP11A?
All MPLAD18KP11A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP11A, 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 MPLAD18KP11A part is unused and in its original packaging.
Return procedure for MPLAD18KP11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP11A Tags
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