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Microchip Technology MPLAD36KP78A/TR
- Part No.:
- MPLAD36KP78A/TR
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP78A/TR.pdf
- Description:
- SURFACE MOUNT 36,000 WATT, TVS,
- Quantity:
- Payment:
- Shipping:
Inventory:7,576
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Product details
Overview
MPLAD36KP78A/TR from Microsemi (now Microchip) is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 36,000 W peak pulse power at 10/1000 μs, clamps transients to ≤126 V at 286 A, and features a 78 V working standoff voltage with <100 ps response time. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MPLAD36KP78A/TR datasheet, MPLAD36KP78A/TR pinout, MPLAD36KP78A/TR application, or MPLAD36KP78A/TR equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 1.0 °C/W), IEC 61000-4-5 Class 4/5 compliance, and RoHS-compliant surface-mount integration are critical.
Technical Context
This TVS operates in avalanche breakdown mode with a specified breakdown voltage range of 86.7–95.8 V at 5 mA test current and exhibits a temperature coefficient of ≤95 mV/°C. Its metal-base PLAD package enables direct thermal coupling to heatsinks, supporting continuous power dissipation up to 504 W at 100 °C case temperature.
The device achieves sub-100 ps turn-on latency in unidirectional configuration and maintains clamping voltage ≤126 V under 286 A peak impulse current (10/1000 μs). Standby leakage remains ≤10 µA at 78 V standoff, ensuring minimal system loading during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 36,000 W at 10/1000 μs - sustains full lightning-level surges without failure |
| Working Standoff Voltage (VWM) | 78 V - matches nominal 72 V DC bus systems with 8% margin for ripple and tolerance |
| Clamping Voltage (VC) | ≤126 V at IPP = 286 A - limits downstream component stress during worst-case transients |
| Breakdown Voltage (VBR) | 86.7–95.8 V at IBR = 5 mA - ensures reliable conduction onset above operating voltage |
| Thermal Resistance (RθJC) | 1.0 °C/W - enables efficient heat transfer to external heatsink for sustained surge duty cycles |
| Response Time | <100 ps - activates before sensitive electronics experience overvoltage damage |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
The MPLAD36KP78A/TR uses the PLAD surface-mount package: void-free UL94V-0 epoxy body with metal base acting as cathode terminal; total weight 1.7–2.0 g; RoHS-compliant matte-tin plating on terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and high-current return node; must be soldered to thermal pad per Figure 7 |
| Top Surface Marking Area | Anode | Electrically connected to molded top surface; routed via PCB trace to protected line |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW Surge Rating | Enables single-device protection against RTCA DO-160G Waveform 4 (6.4/69 μs) Level 4/5 in aircraft avionics |
| Low RθJC = 1.0 °C/W | Supports >500 W steady-state dissipation when mounted on copper heatsink, extending surge endurance |
| AEC-Q101 Qualification | Validates robustness across -55 °C to +150 °C junction temperature range for automotive engine control units |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for standard SMT reflow |
| Traceable Wafer & Assembly Lots | Enables full lot-level failure analysis and supply chain transparency for defense/aerospace programs |
Applications
| Aircraft DC Power Distribution | Automotive 48 V Mild Hybrid Bus |
|---|---|
Use Scenario: Protection of 28 V aircraft bus against lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping device on main power feed, activated within <100 ps to limit voltage to ≤126 V. Use Value: Meets multi-stroke lightning standard without derating or parallel devices due to 36 kW rating and low RθJC. |
Use Scenario: Load dump suppression on 48 V battery rail in mild hybrid vehicles per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between alternator output and ECU input to clamp 120 V spikes. Use Value: Clamps at 126 V while handling 286 A peak current-exceeds ISO 7637-2 requirement of 200 A at 120 V. |
| Industrial Motor Drive DC Link | Railway Signaling Power Supply |
Use Scenario: Secondary surge protection on 75–85 V DC link of variable-frequency drives exposed to switching transients. IC Role / Device Role / Timing Role: Fast-response TVS shunting inductive kickback energy away from IGBT gate drivers and controllers. Use Value: Sub-100 ps response prevents gate oxide damage; 78 V VWM aligns with 80 V nominal rail with 2.5% margin. |
Use Scenario: IEC 61000-4-5 Class 4 protection on 72 V signaling power supplies in EN 50121-3-2 compliant railway systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary input stage, clamping 42 Ω source impedance surges to ≤126 V. Use Value: Certified for Class 4 with 42 Ω source per datasheet Table 4 - eliminates need for external series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A | Lower 600 W peak power; SMA package; RθJC ≈ 45 °C/W | Not suitable for RTCA DO-160 multi-stroke or IEC 61000-4-5 Class 4/5 | Select only for cost-sensitive, low-energy consumer applications with <100 A surge exposure |
| SMCJ78A | 3,000 W peak power; SMC package; RθJC ≈ 12 °C/W; same VWM/VC specs | Meets IEC 61000-4-5 Class 3 but not Class 4/5 or DO-160G Level 4/5 | Use where space allows larger SMC footprint and 36 kW rating is unnecessary |
Compared with SMBJ78A and SMCJ78A, the MPLAD36KP78A/TR delivers 12× and 12× higher peak power respectively, enabling single-device compliance with aviation and heavy-duty industrial surge standards that require verified multi-stroke endurance and sub-100 ps response.
Availability
MPLAD36KP78A/TR is available at Aetrix Electronics and suitable for aircraft power distribution, automotive 48 V systems, industrial motor drives, and railway signaling requiring stable component supply across extended product lifecycles.
Supply support for MPLAD36KP78A/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 (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and power solutions for aerospace, defense, and industrial markets.
The MPLAD36KP78A/TR belongs to Microsemi's high-power PLAD-series TVS family, engineered specifically for mission-critical surge protection where thermal performance, multi-stroke endurance, and aviation qualification are mandatory.
FAQ
What is the maximum clamping voltage of the MPLAD36KP78A/TR under rated surge conditions?
The MPLAD36KP78A/TR has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current of 286 A at the 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and is measured per JEDEC standards. The clamping performance directly protects downstream 100 V-rated components on 78 V nominal rails.
Is the MPLAD36KP78A/TR compatible with lead-free reflow processes?
Yes, the MPLAD36KP78A/TR supports lead-free reflow with a maximum solder temperature of 260 °C for 10 seconds, as specified in its absolute maximum ratings. Its RoHS-compliant matte-tin plating and UL94V-0 epoxy body ensure compatibility with IPC/JEDEC J-STD-020D.1 Level 1 moisture sensitivity-no baking or dry pack required prior to assembly.
Does the MPLAD36KP78A/TR meet RTCA DO-160G Section 22 lightning requirements?
Yes, the MPLAD36KP78A/TR is explicitly rated for RTCA DO-160G Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 and Level 5. Its 36,000 W rating, <100 ps response, and low thermal resistance enable repeated surge handling without degradation-validated per manufacturer test reports.
What is the thermal resistance from junction to case (RθJC) for the MPLAD36KP78A/TR?
The MPLAD36KP78A/TR has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, measured with the metal base fully soldered to a thermally optimized PCB pad. This value enables effective heat transfer to external heatsinks and supports 504 W continuous power dissipation at 100 °C case temperature-critical for high-duty-cycle surge environments.
How does the MPLAD36KP78A/TR differ from bidirectional variants like MPLAD36KP78CA/TR?
The MPLAD36KP78A/TR is unidirectional, conducting only in reverse bias above 86.7 V, while the CA-suffix variant is bidirectional with symmetrical clamping in both polarities. The unidirectional MPLAD36KP78A/TR offers lower capacitance and faster response (<100 ps vs. <5 ns), making it preferred for DC rail protection where polarity is fixed and speed is critical.
MPLAD36KP78A/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:
- 1
- Bidirectional Channels:
- -
- 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
MPLAD36KP78A/TR FAQ
1.How can I place an order for MPLAD36KP78A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP78A/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 MPLAD36KP78A/TR reliable?
The price and inventory of MPLAD36KP78A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP78A/TR is usually 5 days.
3.What payment methods are accepted for MPLAD36KP78A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP78A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP78A/TR?
MPLAD36KP78A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP78A/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 MPLAD36KP78A/TR?
For technical support, including MPLAD36KP78A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP78A/TR requirements.
6.How does Aetrix verify that MPLAD36KP78A/TR is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP78A/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 MPLAD36KP78A/TR meets industry standards.
7.What is the process for return or replacement of MPLAD36KP78A/TR?
All MPLAD36KP78A/TR units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP78A/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 MPLAD36KP78A/TR part is unused and in its original packaging.
Return procedure for MPLAD36KP78A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP78A/TR Tags
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