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Microchip Technology MPLAD36KP70A
- Part No.:
- MPLAD36KP70A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP70A.pdf
- Description:
- TVS DIODE 70VWM 113VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,941
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Product details
Overview
MPLAD36KP70A 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 at ≤113 V under 319 A peak impulse current, and features a 70 V reverse standoff voltage (VWM) with 77.8–86.0 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MPLAD36KP70A datasheet, MPLAD36KP70A pinout, MPLAD36KP70A application, or MPLAD36KP70A equivalent, this device is selected for primary or secondary lightning protection where low thermal resistance, high reliability traceability, and RoHS-compliant SMT mounting are critical - especially in avionics power distribution, vehicle ECU input stages, and industrial DC bus interfaces.
Technical Context
The MPLAD36KP70A uses silicon avalanche diode technology in a void-free thermosetting epoxy package with metal base cathode termination. Its junction-to-case thermal resistance is 1.0 °C/W, enabling efficient heat transfer to PCB copper pads or heatsinks under repetitive surge conditions up to 0.05% duty factor.
It operates as a clamping-type protector: below 70 V it presents <10 μA standby current; above breakdown (77.8–86.0 V), it rapidly transitions to low-impedance conduction, limiting transient voltage to ≤113 V at 319 A. It complies with IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances) and RTCA/DO-160F Waveform 4 (Level 4/5) and Waveform 5A (Level 4/5) pin injection standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains single or multi-stroke lightning surges without failure when mounted per recommended pad layout |
| Reverse Standoff Voltage (VWM) | 70 V - maximum continuous DC or peak AC voltage the device blocks during normal operation without leakage |
| Breakdown Voltage (V(BR)) | 77.8–86.0 V @ 5 mA - precise voltage threshold at which avalanche conduction initiates, defining turn-on consistency |
| Max Clamping Voltage (VC) | ≤113 V @ 319 A - limits transient voltage seen by downstream circuitry, protecting 75–100 V-rated components |
| Peak Pulse Current (IPP) | 319 A @ 10/1000 μs - quantifies maximum surge current the device safely diverts while maintaining clamping performance |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables direct thermal coupling to PCB ground plane or heatsink, critical for repetitive surge handling |
| Standby Current (ID) | ≤10 μA @ 70 V - ensures negligible power loss and signal integrity impact in standby or low-power modes |
Pinout & Package
Package: PLAD (Plastic Leaded Anode Down) - surface-mount, low-profile thermoset epoxy case with exposed metal cathode base (pin 1). Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ~1.7–2.0 g. Moisture sensitivity level: IPC/JEDEC J-STD-020B Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top side metallization) | Transient current entry point | Connected to protected line (e.g., +24 V rail); current flows into anode during positive transients |
| Cathode (metal base underside) | Transient current return path & thermal interface | Must be soldered to large copper pour or heatsink; serves as both electrical return and primary thermal dissipation surface |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW peak pulse rating | Enables single-device protection against severe lightning-induced surges per RTCA DO-160 Section 22, eliminating need for cascaded TVS stages |
| 1.0 °C/W RθJC | Allows >90% of surge energy to be conducted directly into PCB copper, reducing localized heating and improving multi-pulse endurance |
| AEC-Q101 qualification | Validates robustness for automotive under-hood applications including engine control units and battery management inputs |
| Wafer and assembly lot traceability | Supports full supply chain auditability and failure analysis for aerospace and defense programs requiring MIL-PRF-19500 upscreening options |
| RoHS-compliant (e3 plating) | Meets global environmental compliance without sacrificing solderability or long-term intermetallic stability in high-reliability assemblies |
Applications
| Aerospace Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
|
Use Scenario: Protection of 28 V DC main bus in commercial aircraft avionics bays against induced lightning transients per DO-160F Section 22. IC Role / Device Role / Timing Role: Primary clamping element placed at bus entry point, shunting surge energy to chassis ground before reaching downstream converters and FPGAs. Use Value: Withstands ≥50 multi-stroke lightning events at 319 A without parameter shift, ensuring system-level DO-160 compliance without derating or redundancy. |
Use Scenario: Input protection for 12 V/24 V power pins on engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO regulator input to clamp transients above 70 V while passing nominal voltage. Use Value: Clamps 120 V/200 ms load dump spikes to ≤113 V, preventing overvoltage damage to 75 V-rated input capacitors and PMICs. |
| Industrial DC Motor Drive Inputs | Railway Signaling Interface |
|
Use Scenario: Surge suppression on 48 V DC control lines feeding brushless motor drives in factory automation systems. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy from IEC 61000-4-5 42 Ω source impedance surges. Use Value: Limits clamped voltage to 113 V during 4 kV/2 kA surges, safeguarding 100 V-rated gate drivers and isolated communication ICs. |
Use Scenario: Protection of 72 V DC signaling lines in European railway signaling cabinets subject to EN 50121-3-2 conducted surge stress. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MPLAD36KP70CA) used for symmetric line-to-line protection; unidirectional MPLAD36KP70A applied for line-to-ground on powered rails. Use Value: Achieves Class 4 immunity per IEC 61000-4-5 (2 Ω source) with ≤113 V clamping, preserving signal integrity across optocoupled isolation barriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | Lower PPP (600 W), smaller SMB package, 1.5x higher RθJA (50 °C/W vs. 1.0 °C/W), no AEC-Q101 or DO-160 qualification | Suitable only for low-energy ESD/EFT; cannot meet multi-stroke lightning or load dump requirements | Select only for cost-sensitive consumer electronics with sub-100 A surge exposure. |
| SMCJ70A | Higher PPP (1500 W), larger SMC package, RθJC ≈ 2.5 °C/W, AEC-Q101 qualified but not DO-160 tested | Acceptable for automotive load dump if peak current ≤100 A; insufficient for DO-160 Section 22 multi-stroke validation | Choose when board space allows SMC footprint and DO-160 compliance is not required. |
Compared with SMBJ70A and SMCJ70A, the MPLAD36KP70A provides 24× and 24× higher peak pulse power respectively, coupled with 2.5× and 1.5× lower thermal resistance - making it the only option capable of certified multi-stroke lightning protection in space-constrained SMT layouts.
Availability
MPLAD36KP70A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU protection, and industrial DC motor drive inputs requiring stable component supply across extended production lifecycles.
Supply support for MPLAD36KP70A 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened solutions for aerospace, defense, and industrial markets.
The MPLAD36KP70A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load dump protection in safety-critical platforms where thermal performance, lot traceability, and regulatory compliance are non-negotiable.
FAQ
What is the maximum clamping voltage of the MPLAD36KP70A at its rated peak pulse current?
The MPLAD36KP70A has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 319 A 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 worst-case surge events. The MPLAD36KP70A maintains this clamping performance across its full operating temperature range when mounted per the specified pad layout.
Is the MPLAD36KP70A suitable for bidirectional transient protection?
No - the MPLAD36KP70A is a unidirectional TVS diode, with polarity marked by cathode on the metal base underside. For bidirectional protection, the functionally equivalent part is MPLAD36KP70CA (CA suffix denotes bidirectional construction). Using MPLAD36KP70A in bidirectional configurations risks forward conduction during negative transients and potential device failure. Always match polarity designation to system surge polarity requirements.
Does the MPLAD36KP70A require special PCB layout considerations?
Yes - the MPLAD36KP70A requires a dedicated thermal pad layout per the datasheet's "PAD LAYOUT" diagram (Ref. A = 11.94 mm, B = 5.85 mm). Its metal cathode base must connect to ≥250 mm² of internal or external copper pour to achieve the specified 1.0 °C/W junction-to-case thermal resistance. Narrow traces or insufficient copper will cause thermal runaway under repetitive surges. The MPLAD36KP70A also requires lead-free reflow profile compliance (peak 260 °C for 10 s).
What certifications does the MPLAD36KP70A hold beyond AEC-Q101?
In addition to AEC-Q101 qualification, the MPLAD36KP70A is verified to meet RTCA DO-160F Section 22 (lightning-induced transient susceptibility), IEC 61000-4-5 (surge immunity with 42 Ω, 12 Ω, and 2 Ω source impedances), and IEC 61000-4-2/4-4 (ESD and EFT). It is also moisture sensitivity Level 1 per J-STD-020B and RoHS-compliant (e3 marking). These certifications are documented in Microsemi's RF01216 Rev B datasheet and supporting MicroNotes.
Can the MPLAD36KP70A be used in parallel for higher current handling?
No - the MPLAD36KP70A is not characterized or recommended for parallel operation. Its avalanche breakdown voltage tolerance (77.8–86.0 V) introduces imbalance risk: the unit with lower V(BR) will conduct first and absorb disproportionate surge energy, leading to thermal runaway. For higher current needs, select a higher-voltage variant (e.g., MPLAD36KP100A) or use discrete current-sharing designs with matched devices and ballasting resistors - but such configurations require full system-level validation.
MPLAD36KP70A 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 319A
- 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
MPLAD36KP70A FAQ
1.How can I place an order for MPLAD36KP70A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP70A 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 MPLAD36KP70A reliable?
The price and inventory of MPLAD36KP70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP70A is usually 5 days.
3.What payment methods are accepted for MPLAD36KP70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP70A?
MPLAD36KP70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP70A 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 MPLAD36KP70A?
For technical support, including MPLAD36KP70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP70A requirements.
6.How does Aetrix verify that MPLAD36KP70A is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP70A 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 MPLAD36KP70A meets industry standards.
7.What is the process for return or replacement of MPLAD36KP70A?
All MPLAD36KP70A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP70A, 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 MPLAD36KP70A part is unused and in its original packaging.
Return procedure for MPLAD36KP70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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