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Microchip Technology MPLAD36KP400A
- Part No.:
- MPLAD36KP400A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP400A.pdf
- Description:
- TVS DIODE 400VWM 644VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,810
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Product details
Overview
MPLAD36KP400A 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, clamps transients to ≤644 V at 50 A, and features a 400 V reverse standoff voltage (VWM) with 444–492 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MPLAD36KP400A datasheet, MPLAD36KP400A pinout, MPLAD36KP400A application, or MPLAD36KP400A equivalent, key selection criteria include its 400 V VWM rating, 644 V max clamping voltage at IPP, low thermal resistance (RθJC = 1.0 °C/W), RoHS-compliant e3 plating, and suitability for secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance up to Class 5.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode on the metal base (package bottom), enabling direct thermal coupling to PCB copper or heatsinks. Its void-free UL94V-0 epoxy package and optimized pad layout minimize thermal resistance (RθJA = 50 °C/W on FR4), supporting high-repetition surges at ≤0.05% duty factor.
It is characterized for 10/1000 μs waveform compliance, with clamping response <100 ps and tested to 1000 A surge current. Standby leakage (ID) is ≤10 μA at 400 V, and temperature coefficient of V(BR) is +56 mV/°C - critical for stable operation across –55°C to +150°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - enables single-device protection against severe lightning-induced transients per DO-160F Waveform 4/5A and IEC 61000-4-5. |
| Reverse Standoff Voltage (VWM) | 400 V - maximum continuous DC or peak AC voltage the device blocks without clamping; selected to exceed system operating voltage. |
| Clamping Voltage (VC) | 644 V @ 50 A - maximum voltage seen by protected circuit during specified surge; defines safe overvoltage margin for downstream components. |
| Breakdown Voltage (V(BR)) | 444–492 V @ 5 mA - ensures reliable turn-on before VC is reached; tight tolerance supports predictable protection threshold. |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - allows efficient heat transfer to heatsink or large copper pour, sustaining repeated surges without thermal runaway. |
| Standby Leakage Current | ≤10 μA @ 400 V - negligible power loss in standby, critical for battery-backed or low-quiescent systems. |
| Operating Temperature Range | –55°C to +150°C - validated for under-hood automotive, avionics, and industrial environments with wide thermal cycling. |
Pinout & Package
Package: PLAD (Plastic Low-profile Anode-down) surface-mount package with metal base cathode terminal; dimensions 12.32 × 10.54 × 5.08 mm (L × W × H); weight ~1.7–2.0 g; RoHS-compliant matte-tin plating (e3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Surface Pads) | Current entry point during forward conduction | Connected to protected line; low-inductance dual-pad layout minimizes voltage overshoot during fast transients. |
| Cathode (Metal Base) | Current exit point; primary thermal path | Directly soldered to PCB ground plane or heatsink; serves as both electrical return and thermal interface - requires full-surface mounting. |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer lot traceability | Enables full process traceability for aerospace and defense programs requiring MIL-PRF-19500 upscreening options. |
| RTCA DO-160F Section 22 compliance | Validated for multi-stroke lightning testing - essential for aircraft power distribution and avionics interface protection. |
| IEC 61000-4-5 Class 5 support (42 Ω) | Meets highest severity secondary lightning immunity for long-distance wiring in industrial control cabinets and vehicle ECUs. |
| Moisture Sensitivity Level 1 | No dry pack or baking required prior to reflow - simplifies manufacturing and reduces assembly cost and risk. |
| AEC-Q101 qualification | Qualified for automotive under-hood applications including alternator load dump and battery reverse polarity protection. |
Applications
| Aircraft Power Distribution | Automotive Alternator Protection |
|---|---|
Use Scenario: Protecting 28 V DC bus in commercial aircraft auxiliary power units from induced lightning transients per DO-160F Section 22. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed at bus input to limit voltage excursions to <644 V during multi-stroke events. Use Value: Enables compliance with FAA airworthiness requirements while eliminating need for redundant protection stages. | Use Scenario: Safeguarding engine control unit inputs during 12 V automotive load dump events (ISO 7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Primary surge clamp on battery feed line, activated within <100 ps to suppress 120 V/400 ms transients. Use Value: Prevents latch-up or damage to MCU I/O and power management ICs without derating for ambient temperature extremes. |
| Industrial Motor Drive Inputs | Railway Signaling Interface |
Use Scenario: Protecting 400 V DC link monitoring circuits in variable-frequency drives from switching-induced RFI and EFT bursts. IC Role / Device Role / Timing Role: High-power TVS placed across isolated voltage sense inputs to absorb coupled transients without compromising measurement accuracy. Use Value: Maintains signal integrity during 4 kV EFT (IEC 61000-4-4) and prevents false trip conditions in safety-critical motion control. | Use Scenario: Securing 24 V DC trackside signaling interfaces against induced surges from nearby lightning strikes on rail infrastructure. IC Role / Device Role / Timing Role: Secondary lightning protector per IEC 61000-4-5 (42 Ω, Class 5), mounted at field cable entry point. Use Value: Extends mean time between failures (MTBF) of signaling relays and optocouplers in harsh outdoor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ400A | Lower PPP (600 W), smaller SMB package, RθJC ≈ 35 °C/W, VWM = 400 V, VC = 644 V @ 50 A | Not suitable for DO-160F multi-stroke or IEC 61000-4-5 Class 5; limited to single-event surges in consumer/industrial equipment. | Select when cost and board space constrain design, and surge energy is <10% of MPLAD36KP400A capability. |
| SMCJ400A | PPP = 1500 W, SMC package, RθJC ≈ 12 °C/W, same VWM/VC specs but lower surge endurance and no AEC-Q101 or DO-160 qualification. | Lacks flight-certified reliability data and upscreening options; used in non-safety-critical industrial controls. | Choose for legacy designs where footprint compatibility with SMC is required and qualification traceability is not mandated. |
Compared with SMBJ400A and SMCJ400A, the MPLAD36KP400A provides 24× and 24× higher peak pulse power respectively, certified thermal performance for sustained surge duty, and full aerospace-grade qualification - making it the only option for DO-160F Section 22 and IEC 61000-4-5 Class 5 deployments.
Availability
MPLAD36KP400A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU protection, and industrial motor drive interface applications requiring stable component supply across extended product lifecycles.
Supply support for MPLAD36KP400A 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 MPLAD36KP400A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for mission-critical surge protection where multi-stroke lightning resilience, thermal robustness, and qualification traceability are mandatory.
FAQ
What is the clamping voltage of the MPLAD36KP400A at its rated peak pulse current?
The MPLAD36KP400A has a maximum clamping voltage (VC) of 644 V at 50 A peak pulse current under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 datasheet and defines the upper voltage limit imposed on protected circuitry during surge events. The MPLAD36KP400A maintains this clamping performance across its full operating temperature range.
Is the MPLAD36KP400A suitable for automotive under-hood applications?
Yes, the MPLAD36KP400A is AEC-Q101 qualified and rated for –55°C to +150°C junction temperature, making it suitable for under-hood automotive use. It is specifically designed to withstand alternator load dump transients and meets ISO 7637-2 Pulse 5 requirements. The MPLAD36KP400A's metal-base thermal path enables reliable operation when mounted on thermally enhanced PCBs or heatsinks.
Does the MPLAD36KP400A have bidirectional variants, and how do they differ?
No - the MPLAD36KP400A is unidirectional only. Bidirectional versions carry the "CA" suffix (e.g., MPLAD36KP400CA) and feature symmetrical clamping in both polarities. The MPLAD36KP400A's cathode is on the metal base, requiring correct orientation during placement; its unidirectional behavior makes it ideal for DC bus protection where polarity is fixed and reverse conduction must be blocked.
What is the thermal resistance from junction to case (RθJC) for the MPLAD36KP400A, and why does it matter?
The MPLAD36KP400A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, measured with the case controlled on a heatsink as specified. This low value enables rapid heat dissipation from the silicon die into the PCB copper or external heatsink, preventing thermal runaway during repetitive surge events. For the MPLAD36KP400A, this spec directly supports its 0.05% duty cycle rating and DO-160F multi-stroke compliance.
Can the MPLAD36KP400A be used for IEC 61000-4-5 Class 5 lightning protection?
Yes - the MPLAD36KP400A is explicitly listed for IEC 61000-4-5 Class 5 secondary lightning protection with 42 Ω source impedance in short-distance configurations. Its 36 kW PPP rating, low clamping voltage, and validated multi-stroke endurance make it appropriate for high-severity installations such as aircraft avionics bays and railway signaling cabinets. The MPLAD36KP400A's qualification is documented in RF01216 Rev B, Table on page 2.
MPLAD36KP400A 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):
- 400V
- Voltage - Breakdown (Min):
- 444V
- Voltage - Clamping (Max) @ Ipp:
- 644V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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
MPLAD36KP400A FAQ
1.How can I place an order for MPLAD36KP400A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP400A 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 MPLAD36KP400A reliable?
The price and inventory of MPLAD36KP400A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP400A is usually 5 days.
3.What payment methods are accepted for MPLAD36KP400A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP400A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP400A?
MPLAD36KP400A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP400A 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 MPLAD36KP400A?
For technical support, including MPLAD36KP400A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP400A requirements.
6.How does Aetrix verify that MPLAD36KP400A is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP400A 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 MPLAD36KP400A meets industry standards.
7.What is the process for return or replacement of MPLAD36KP400A?
All MPLAD36KP400A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP400A, 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 MPLAD36KP400A part is unused and in its original packaging.
Return procedure for MPLAD36KP400A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP400A Tags
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