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Microchip Technology MPLAD36KP43A
- Part No.:
- MPLAD36KP43A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,743
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Product details
Overview
MPLAD36KP43A 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 36 kW peak pulse power at 10/1000 μs, features a 43 V reverse standoff voltage (VWM), clamps to ≤69.4 V at 519 A peak pulse current, and operates across –55°C to +150°C junction temperature - deployed in lightning-prone avionics power rails and load-dump-protected vehicle ECUs.
For engineers reviewing the MPLAD36KP43A datasheet, MPLAD36KP43A pinout, MPLAD36KP43A application, or MPLAD36KP43A equivalent, this page provides verified electrical parameters, IEC 61000-4-5 and RTCA DO-160F waveform compliance data, thermal resistance values, polarity marking guidance, and direct alternatives validated for secondary lightning protection in safety-critical embedded systems.
Technical Context
The MPLAD36KP43A implements a silicon avalanche diode structure optimized for low clamping ratio and minimal thermal resistance (RθJC = 1.0 °C/W). Its unidirectional polarity places the cathode on the metal baseplate, enabling efficient heat sinking to PCB copper or external heatsinks.
It meets multi-stroke lightning immunity per RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 up to 300 V standoff variants - with MPLAD36KP43A specifically rated for 43 V VWM, 47.8–52.8 V V(BR), and 69.4 V VC @ 519 A, supporting secondary protection in 28 V and 42 V aircraft bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains single-stroke lightning surges without failure under defined thermal mounting conditions |
| Reverse Standoff Voltage (VWM) | 43 V - maximum continuous DC or RMS operating voltage before significant leakage begins |
| Breakdown Voltage (V(BR)) | 47.8–52.8 V @ 5 mA - ensures reliable avalanche conduction onset above system nominal voltage |
| Clamping Voltage (VC) | ≤69.4 V @ 519 A - limits downstream component stress during worst-case surge events |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables effective heat transfer to metal-core PCB or heatsink for repeated surge duty |
| Standby Current (ID) | ≤10 μA @ 43 V - negligible quiescent loading on protected 28/42 V supply rails |
| Operating Temperature Range | –55°C to +150°C - qualified for engine bay, avionics bay, and outdoor industrial environments |
Pinout & Package
Surface-mount PLAD package with metal baseplate cathode terminal and molded thermosetting epoxy body (UL94V-0). Cathode is the entire metal underside; anode is the top-side metallized pad. Requires recommended FR4 pad layout (A = 0.470", B = 0.230") for thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Baseplate (Bottom) | Cathode | Primary heat path and high-current return node; must be soldered to large copper pour or heatsink |
| Top Metallized Pad | Anode | Surge current entry point; connects to protected line (e.g., 28 V bus input) |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT construction | Enables placement on dense power-conversion PCBs without height interference; 0.495" max height |
| RTCA DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin-injection transients up to 43 V VWM - critical for aircraft data/power line hardening |
| IEC 61000-4-5 Class 4 support (42 Ω source) | Meets secondary lightning immunity for 43 V systems with 42 Ω impedance source - used in ground-support equipment interfaces |
| Moisture Sensitivity Level 1 | No dry-pack or bake-out required before reflow - reduces manufacturing overhead and avoids moisture-induced popcorning |
| AEC-Q101 qualified | Validated for automotive under-hood applications including alternator load dump and ISO 7637-2 pulse testing |
Applications
| Avionics Power Bus Protection | Automotive Alternator Load Dump |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses in commercial aircraft against induced lightning transients per DO-160F Section 22. IC Role / Device Role / Timing Role: Unidirectional TVS placed at bus entry point to clamp surges before they reach power converters and flight control modules. Use Value: Limits clamped voltage to ≤69.4 V during 519 A transients, preserving downstream 100 V-rated MOSFETs and gate drivers. | Use Scenario: Safeguarding engine control units (ECUs) and infotainment systems during alternator field-circuit interruption events. IC Role / Device Role / Timing Role: Primary surge suppression device on battery feed lines, absorbing up to 36 kW energy within 1 ms. Use Value: Withstands 1500 A forward surge (IFSM) and maintains <10 μA leakage at 43 V, ensuring no parasitic drain on vehicle battery. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: Secondary overvoltage protection on 48 V DC link rails of variable-frequency drives exposed to switching transients and EFT noise. IC Role / Device Role / Timing Role: Fast-response avalanche diode that activates within <100 ps to suppress dV/dt spikes from IGBT commutation. Use Value: Clamps 43 V rail to ≤69.4 V at 519 A, preventing gate oxide breakdown in 75 V-rated SiC drivers. | Use Scenario: Surge protection for 43 V signaling lines in European railway signaling cabinets subject to IEC 61000-4-5 Class 4 (42 Ω source). IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used in differential pair protection schemes with common-mode choke filtering. Use Value: Validated for 43 V standoff with 69.4 V clamping - matches EN 50121-3-2 requirements for trackside electronics immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | 600 W PPP rating, SMB package, RθJC ≈ 15 °C/W - lower power handling and higher thermal resistance | Not suitable for DO-160F multi-stroke lightning; limited to single-pulse IEC 61000-4-5 Class 2 | Select only for cost-sensitive, low-duty-cycle industrial sensors where 36 kW capability is unnecessary |
| SMCJ43A | 1500 W PPP, SMC package, RθJC ≈ 3.5 °C/W - 24× lower peak power than MPLAD36KP43A | Cannot meet RTCA DO-160F Section 22 Waveform 4 Level 4; insufficient for aircraft bus protection | Use where board space allows larger SMC footprint but full 36 kW rating is not required |
Compared with SMBJ43A and SMCJ43A, the MPLAD36KP43A delivers 60× and 24× higher peak pulse power respectively, with 15× and 3.5× lower junction-to-case thermal resistance - making it the only option qualified for multi-stroke lightning protection in certified avionics and high-reliability automotive power systems.
Availability
MPLAD36KP43A is available at Aetrix Electronics and suitable for avionics power bus protection, automotive load dump mitigation, and industrial motor drive DC link safeguarding requiring stable component supply across extended production lifecycles.
Supply support for MPLAD36KP43A 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MPLAD36KP43A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection and automotive load dump compliance in safety-critical power systems.
FAQ
What is the clamping voltage of MPLAD36KP43A at its rated peak pulse current?
The MPLAD36KP43A has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 519 A under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees downstream circuit protection by limiting transient overvoltage exposure to safe levels for 75 V-rated components. The MPLAD36KP43A achieves this while maintaining low thermal resistance for repeatable performance.
Is MPLAD36KP43A RoHS compliant?
Yes, MPLAD36KP43A is RoHS compliant and marked with the "e3" suffix per Microsemi's nomenclature. Its terminals use annealed matte-tin plating, and the void-free thermosetting epoxy body meets UL94V-0 flammability requirements. The device undergoes 3σ lot norm screening on standby current and is moisture sensitivity level 1 - eliminating need for dry pack prior to reflow soldering.
How does MPLAD36KP43A differ from bidirectional versions like MPLAD36KP43CA?
MPLAD36KP43A is unidirectional with cathode on the metal baseplate, intended for DC line protection where polarity is fixed. MPLAD36KP43CA is bidirectional and symmetrical, enabling AC or differential signal line protection. The clamping behavior, VWM, and PPP rating are identical, but the CA variant lacks polarity marking and supports reverse-biased surge conduction - making MPLAD36KP43A unsuitable for AC-coupled interfaces unless paired with series blocking diodes.
Can MPLAD36KP43A be used in automotive applications per AEC-Q101?
Yes, MPLAD36KP43A is tested and qualified to AEC-Q101 for automotive applications. It withstands load dump pulses (ISO 7637-2) and ESD events (IEC 61000-4-2), with validated performance up to 1500 A forward surge current (IFSM). Its –55°C to +150°C operating range and robust thermal design make it suitable for under-hood ECUs, battery management systems, and ADAS power supplies where sustained reliability is mandatory.
What is the recommended PCB pad layout for MPLAD36KP43A?
The recommended pad layout for MPLAD36KP43A specifies a 0.470" × 0.230" rectangular top pad (anode) and full-surface metal baseplate soldering (cathode) to maximize thermal dissipation. Per Microsemi RF01216 Rev B, the metal base must contact ≥1 in² of 2-oz copper with thermal vias to inner ground planes. This layout ensures RθJA remains near 50 °C/W and prevents thermal runaway during repetitive 36 kW surges.
MPLAD36KP43A 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 519A
- Power - Peak Pulse:
- 36000W (36kW)
- 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
MPLAD36KP43A FAQ
1.How can I place an order for MPLAD36KP43A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP43A 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 MPLAD36KP43A reliable?
The price and inventory of MPLAD36KP43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP43A is usually 5 days.
3.What payment methods are accepted for MPLAD36KP43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP43A?
MPLAD36KP43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP43A 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 MPLAD36KP43A?
For technical support, including MPLAD36KP43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP43A requirements.
6.How does Aetrix verify that MPLAD36KP43A is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP43A 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 MPLAD36KP43A meets industry standards.
7.What is the process for return or replacement of MPLAD36KP43A?
All MPLAD36KP43A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP43A, 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 MPLAD36KP43A part is unused and in its original packaging.
Return procedure for MPLAD36KP43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP43A Tags
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