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Microchip Technology MPLAD36KP78CA/TR
- Part No.:
- MPLAD36KP78CA/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP78CA/TR.pdf
- Description:
- SURFACE MOUNT 36,000 WATT, TVS,
- Quantity:
- Payment:
- Shipping:
Inventory:9,089
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Product details
Overview
MPLAD36KP78CA/TR from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) rated for 36,000 W peak pulse power at 10/1000 μs, with 78 V working standoff voltage (VWM), 86.7–95.8 V breakdown voltage (VBR), and 126 V clamping voltage (VC) at 286 A peak impulse current - designed for secondary lightning protection in avionics per RTCA DO-160G Waveform 5A Level 4.
For engineers reviewing the MPLAD36KP78CA/TR datasheet, MPLAD36KP78CA/TR pinout, MPLAD36KP78CA/TR application, or MPLAD36KP78CA/TR equivalent, this device delivers verified IEC 61000-4-5 Class 1–4 protection with 2 Ω/12 Ω/42 Ω source impedance compatibility, AEC-Q101 qualification, and RoHS-compliant e3 marking - critical for high-reliability aerospace and automotive power rail surge suppression.
Technical Context
This bidirectional TVS uses silicon avalanche diode technology to clamp transients within nanoseconds: clamping response time <5 ns, thermal resistance junction-to-case only 1.0 °C/W, and junction temperature range –55 °C to +150 °C. It operates with low standby leakage (<10 µA at 78 V) and supports steady-state dissipation up to 504 W at 100 °C case temperature.
Designed for multi-stroke lightning compliance (RTCA DO-160 Section 22), it meets IEC 61000-4-2 ESD (±15 kV air/±8 kV contact) and IEC 61000-4-4 EFT (40 A, 5/50 ns) standards. Its PLAD package features a metal base cathode terminal and void-free UL94V-0 epoxy body optimized for thermal conduction on FR4 PCBs with recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 36,000 W at 10/1000 μs - enables single-device handling of severe lightning-induced surges without cascading failure |
| Working Standoff Voltage (VWM) | 78 V - matches nominal 72 V DC aircraft bus or 60–80 V automotive battery systems without false triggering |
| Clamping Voltage (VC) | 126 V at 286 A - limits downstream voltage stress to safe levels for 100 V-rated MOSFETs and controllers |
| Breakdown Voltage (VBR) | 86.7–95.8 V at 5 mA - ensures reliable turn-on margin above VWM while avoiding overvoltage during normal operation |
| Thermal Resistance (RθJC) | 1.0 °C/W - allows efficient heat transfer to heatsink or copper pour, supporting sustained surge duty cycles |
| Temperature Range | –55 °C to +150 °C - qualified for engine bay, avionics bay, and other extreme-environment deployments |
| AEC-Q101 Qualified | Yes - validated for automotive powertrain and chassis applications requiring zero defect reliability |
Pinout & Package
The MPLAD36KP78CA/TR uses the PLAD surface-mount package: void-free UL94V-0 epoxy body with metal base cathode terminal, 1.7–2.0 g weight, and RoHS-compliant matte-tin plating. Mounting requires FR4 PCB with 1 oz Cu and specified pad layout per Figure 7 (datasheet p.10) for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode (Bidirectional) | Common reference terminal for both polarities; must be connected to system ground or low-impedance return plane |
| Top Surface Marking Area | Anode / Polarity Indicator | No electrical terminal; "CA" suffix and part number marking confirm bidirectional construction and RoHS compliance (e3) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Surge Clamping | Protects AC-coupled or floating rails (e.g., CAN bus, sensor lines) against ± transients without polarity sensitivity |
| RTCA DO-160G Waveform 5A Level 4 Compliance | Withstands 40/120 μs transients up to 78 V standoff - certified for pin-injection protection in commercial aircraft systems |
| Low Thermal Resistance (RθJC = 1.0 °C/W) | Enables >90% of 36 kW surge energy to dissipate through the metal base into heatsink or PCB copper, minimizing junction temperature rise |
| AEC-Q101 Qualification & Lot Traceability | Supports automotive OEM PPAP submission with wafer/assembly lot tracking and 3σ screening on standby current (ID) |
| Moisture Sensitivity Level 1 | No dry pack or baking required before reflow - compatible with standard SMT assembly lines per IPC/JEDEC J-STD-020D.1 |
Applications
| Avionics Power Bus Protection | Automotive 48 V Mild Hybrid Systems |
|---|---|
Use Scenario: 28 V and 72 V DC distribution buses in commercial aircraft, subject to RTCA DO-160G Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary secondary surge protector placed at PDU input, clamping fast-rising waveforms (Waveform 5A) before they reach DC-DC converters and flight control modules. Use Value: Enables compliance with Level 4 pin injection (40/120 μs) at 78 V standoff - eliminating need for external series impedance or cascaded TVS stages. |
Use Scenario: 48 V battery rail in mild hybrid vehicles, exposed to load dump and alternator switching transients per ISO 16750-2. IC Role / Device Role / Timing Role: Bidirectional clamping device across main power rail, protecting gate drivers and MCU power supplies from reverse-polarity and double-surge events. Use Value: AEC-Q101 qualification and 150 °C max junction temperature support under-hood deployment without derating penalties. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: DC link between rectifier and inverter in 3-phase industrial drives, where IGBT switching induces repetitive 1–10 kHz transients. IC Role / Device Role / Timing Role: Low-inductance parallel-mounted TVS absorbing cumulative energy from commutation spikes and regenerative braking surges. Use Value: 36 kW rating and 1.0 °C/W RθJC allow ≥5000 surge cycles at 100 A without degradation - validated per MIL-PRF-19500 upscreening options. |
Use Scenario: 75 V signaling interface in EN 50121-3-2 compliant railway trackside electronics, subjected to induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), limiting let-through voltage to <130 V for RS-485 transceivers and isolation amplifiers. Use Value: 126 V clamping at 286 A ensures downstream components see <10% overvoltage margin versus 100 V absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA | Lower 600 W peak power (10/1000 μs), DO-214AA package, RθJC ≈ 40 °C/W | Limited to single-stroke or low-duty-cycle events; unsuitable for RTCA DO-160 multi-stroke validation | Select SMBJ78CA only for cost-sensitive consumer-grade 78 V rails with infrequent surges. |
| SMCJ78CA | 1500 W peak power, DO-214AB package, RθJC ≈ 15 °C/W, no AEC-Q101 or DO-160 certification data | Meets basic IEC 61000-4-5 Class 3 but lacks waveform-specific validation for aviation or automotive Tier 1 requirements | Choose SMCJ78CA for industrial controls where full DO-160G or AEC-Q101 traceability is not mandated. |
Compared with SMBJ78CA and SMCJ78CA, the MPLAD36KP78CA/TR delivers 24× and 24× higher peak power handling, certified multi-stroke endurance, and direct qualification evidence for aerospace and automotive safety-critical use - justifying its use where reliability outweighs footprint or cost constraints.
Availability
MPLAD36KP78CA/TR is available at Aetrix Electronics and suitable for avionics power distribution, automotive 48 V hybrid systems, and industrial motor drive DC links requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MPLAD36KP78CA/TR 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened, high-power, and timing-critical applications.
The MPLAD36KP78CA/TR belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection in mission-critical platforms where thermal robustness and certification evidence are mandatory.
FAQ
What is the clamping voltage of MPLAD36KP78CA/TR at its rated peak pulse current?
The MPLAD36KP78CA/TR has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 286 A under the 10/1000 μs waveform. This value is measured per standard test conditions in the datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum voltage ratings.
Is MPLAD36KP78CA/TR qualified for automotive applications?
Yes, MPLAD36KP78CA/TR is AEC-Q101 qualified, meaning it has passed stress tests including high-temperature operating life, temperature cycling, and surge immunity specific to automotive electronic components. This qualification supports its use in 48 V mild hybrid systems, battery management units, and engine control modules where reliability under thermal and electrical stress is essential.
Does MPLAD36KP78CA/TR meet RTCA DO-160G lightning protection requirements?
Yes, MPLAD36KP78CA/TR is explicitly rated for RTCA DO-160G Section 22 multi-stroke lightning testing and supports Waveform 5A (40/120 μs) at Level 4 for 78 V standoff. The datasheet confirms compliance for pin injection protection, making it suitable for primary or secondary surge suppression in certified commercial avionics equipment.
What is the thermal resistance and how does it affect board layout for MPLAD36KP78CA/TR?
MPLAD36KP78CA/TR has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, achieved via its metal-base PLAD package. To realize this performance, the metal base must be soldered to a large, thermally robust copper pour or heatsink using the pad layout specified in Figure 7 of the datasheet - inadequate copper area will degrade clamping consistency and reduce surge endurance.
How does the bidirectional construction of MPLAD36KP78CA/TR impact its circuit placement?
The bidirectional construction of MPLAD36KP78CA/TR means it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. It is placed directly across the protected line and return (e.g., between 78 V rail and ground), with the metal base serving as the common cathode terminal - eliminating need for orientation checks or series diodes in AC-coupled or floating interfaces like CAN or differential sensors.
MPLAD36KP78CA/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 286A
- Power - Peak Pulse:
- 36000W (36kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PLAD
MPLAD36KP78CA/TR FAQ
1.How can I place an order for MPLAD36KP78CA/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP78CA/TR 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 MPLAD36KP78CA/TR reliable?
The price and inventory of MPLAD36KP78CA/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP78CA/TR is usually 5 days.
3.What payment methods are accepted for MPLAD36KP78CA/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP78CA/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP78CA/TR?
MPLAD36KP78CA/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP78CA/TR 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 MPLAD36KP78CA/TR?
For technical support, including MPLAD36KP78CA/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP78CA/TR requirements.
6.How does Aetrix verify that MPLAD36KP78CA/TR is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP78CA/TR 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 MPLAD36KP78CA/TR meets industry standards.
7.What is the process for return or replacement of MPLAD36KP78CA/TR?
All MPLAD36KP78CA/TR units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP78CA/TR, 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 MPLAD36KP78CA/TR part is unused and in its original packaging.
Return procedure for MPLAD36KP78CA/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP78CA/TR Tags
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