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Microchip Technology MPLAD36KP45A
- Part No.:
- MPLAD36KP45A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP45A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,011
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Product details
Overview
MPLAD36KP45A 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 45 V reverse standoff voltage (VWM), clamps transients to ≤72.7 V at 496 A, and operates across –55°C to +150°C junction temperature.
For engineers reviewing the MPLAD36KP45A datasheet, MPLAD36KP45A pinout, MPLAD36KP45A application, or MPLAD36KP45A equivalent, key selection criteria include its DO-160 Section 22 multi-stroke lightning compliance, IEC 61000-4-5 Class 4/5 secondary lightning capability with 42 Ω source impedance, and suitability for high-reliability board-level ESD/EFT/RFI suppression where thermal resistance (RθJC = 1.0 °C/W) and low-profile mounting are critical.
Technical Context
This TVS diode uses silicon avalanche technology to provide fast-response clamping (<5 ns response time) against high-energy transients including lightning-induced surges, load dump events, and switching spikes. Its metal-base package enables direct thermal coupling to PCB copper or heatsinks, supporting sustained energy dissipation under repetitive 0.05% duty cycle impulses.
The device meets AEC-Q101 stress testing requirements and supports optional MIL-PRF-19500 upscreening (MX/MXL levels). Polarity is defined by cathode on the metal base - critical for correct PCB layout - and it complies with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous operating voltage before clamping begins; sets minimum system bus rating compatibility. |
| V(BR) min/max | 50.0–55.3 V - Breakdown occurs within this range at 5 mA; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 72.7 V max at 496 A - Clamping voltage during full-rated 10/1000 μs surge; defines worst-case overvoltage seen by protected circuitry. |
| PPP | 36,000 W - Peak pulse power handling at 10/1000 μs waveform; validates robustness against lightning and load dump events. |
| RθJC | 1.0 °C/W - Junction-to-case thermal resistance; enables accurate thermal design when mounted on heatsink or thick copper pour. |
| ID @ VWM | 10 μA max - Standby leakage current at rated standoff; negligible power loss in always-on protection schemes. |
| αV(BR) | 51 mV/°C - Temperature coefficient of breakdown voltage; allows precise derating over –55°C to +150°C operating range. |
Pinout & Package
Package: PLAD (Plastic Low-Profile Anvil Design), void-free UL94V-0 epoxy body with metal base cathode termination; dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H); weight: ~1.7–2.0 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface pad) | Transient current entry point | Soldered to protected line (e.g., 45 V rail); must be routed with low-inductance trace to minimize overshoot. |
| Cathode (metal base) | Clamping return path | Must be connected directly to large copper area or heatsink; serves as primary thermal conduction path and ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| DO-160 Section 22 compliance | Validated for multi-stroke lightning immunity in aircraft avionics - eliminates need for external test validation. |
| IEC 61000-4-5 Class 4/5 support | Withstands 42 Ω source impedance surges up to 4 kV (Class 5 short-distance), enabling single-device secondary protection. |
| Low RθJC (1.0 °C/W) | Enables >70% higher steady-state power dissipation vs. standard SMD TVS when thermally anchored - reduces thermal runaway risk. |
| AEC-Q101 qualified | Guarantees reliability under automotive temperature cycling, mechanical shock, and humidity exposure - suitable for under-hood ECUs. |
| RoHS-compliant e3 plating | Tin-lead alternative eliminated; matte-tin terminations ensure solderability per MIL-STD-750 Method 2026 without lead contamination concerns. |
Applications
| Aerospace Power Distribution | Automotive Engine Control Unit |
|---|---|
Use Scenario: Protection of 28 V DC distribution buses in commercial aircraft against RTCA DO-160F Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) pin-injection transients. IC Role / Device Role / Timing Role: Primary transient clamp on main power feed; responds in <5 ns to limit overvoltage to <73 V during multi-stroke lightning events. Use Value: Enables compliance with DO-160F Level 4/5 without additional filtering stages - reduces BOM count and board space. | Use Scenario: Load dump suppression on 12 V engine control module inputs exposed to ISO 7637-2 Pulse 5a (100 V, 400 ms) and induced RFI from ignition coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECU input; clamps 36 kW surges while maintaining <10 μA leakage at 45 V nominal. Use Value: Survives repeated 125°C ambient operation with no derating required - extends field life beyond 15-year vehicle service intervals. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Protection of 48 V DC bus in variable-frequency drives against IGBT switching transients and regenerative energy spikes. IC Role / Device Role / Timing Role: Parallel-mounted TVS on DC link capacitor terminals; absorbs 10/1000 μs surges up to 496 A with <72.7 V clamping. Use Value: Prevents MOSFET gate oxide damage during fault conditions - eliminates need for costly active crowbar circuits. | Use Scenario: Secondary surge protection for 45 V signaling lines in EN 50121-4-compliant railway trackside electronics subjected to indirect lightning coupling. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MPLAD36KP45CA) used here; clamps both polarities to <72.7 V with 42 Ω source impedance per IEC 61000-4-5 Class 4. Use Value: Meets EN 50121-4 Level 4 immunity without external varistors - simplifies CE marking documentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A | 600 W PPP rating (vs. 36,000 W); 70 V VC @ 32.4 A; TO-263 package with RθJC = 3.5 °C/W | Limited to low-energy ESD/EFT; unsuitable for DO-160 lightning or load dump | Select only for cost-sensitive consumer-grade designs with sub-1 kA surge exposure. |
| SMCJ45A | 1500 W PPP rating; 70 V VC @ 139 A; larger SMC package; RθJC = 2.0 °C/W | Supports moderate automotive transients but fails DO-160 multi-stroke and IEC 61000-4-5 Class 5 | Use where space permits and thermal performance > PLAD but < MPLAD36KP45A is acceptable. |
Compared with SMBJ45A and SMCJ45A, the MPLAD36KP45A provides 24× and 24× higher peak pulse power respectively, enabling single-device compliance with aviation and heavy-duty industrial surge standards - eliminating cascaded protection stages and reducing system-level validation effort.
Availability
MPLAD36KP45A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive engine control units, and industrial motor drive DC bus protection requiring stable component supply across extended production lifecycles.
Supply support for MPLAD36KP45A 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, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.
The MPLAD series was developed specifically for high-power, surface-mount transient suppression in safety-critical platforms where thermal management, multi-stroke endurance, and qualification to DO-160 and AEC-Q101 are mandatory.
FAQ
What is the maximum clamping voltage of the MPLAD36KP45A under full-rated surge conditions?
The MPLAD36KP45A has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 496 A under 10/1000 μs waveform conditions. This value is measured at the device terminals and represents the worst-case overvoltage imposed on downstream circuitry during a full-energy transient event. The clamping performance is guaranteed across the full operating temperature range and is validated per AEC-Q101 stress testing protocols.
Does the MPLAD36KP45A require a heatsink for reliable operation?
The MPLAD36KP45A does not require an external heatsink for single-event surge suppression, but its metal base must be soldered to a minimum 100 mm² copper pour (2 oz. thickness) to achieve the specified RθJC of 1.0 °C/W. For repetitive surge applications with >0.05% duty cycle, thermal simulation using the 1.0 °C/W metric and ambient temperature data is recommended. The device's low thermal resistance enables effective heat spreading into the PCB itself.
Is the MPLAD36KP45A compliant with RoHS and REACH regulations?
Yes, the MPLAD36KP45A is RoHS compliant (e3 marking) with annealed matte-tin plating meeting MIL-STD-750 Method 2026 solderability requirements. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits. Full REACH SVHC declaration is available upon request from Aetrix Electronics' technical support team, referencing the exact lot code and revision RF01216 Rev B.
Can the MPLAD36KP45A be used in bidirectional protection configurations?
No - the MPLAD36KP45A is unidirectional only. For bidirectional protection at 45 V standoff, the correct variant is MPLAD36KP45CA (CA suffix). The CA version uses symmetrical internal construction to clamp both positive and negative transients to ≤72.7 V, whereas the 'A' suffix denotes cathode-on-base unidirectional polarity. Using MPLAD36KP45A in AC or bipolar signal paths will result in forward conduction and failure.
What is the moisture sensitivity level (MSL) of the MPLAD36KP45A and does it require dry pack storage?
The MPLAD36KP45A is rated MSL Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and does not require dry pack storage or baking prior to reflow soldering. This is enabled by its void-free transfer-molded UL94V-0 epoxy body and hermetic-like moisture barrier properties. Standard FR4 PCB assembly processes at 260°C peak temperature (10 s) are fully supported without preconditioning.
MPLAD36KP45A 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 496A
- 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
MPLAD36KP45A FAQ
1.How can I place an order for MPLAD36KP45A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP45A 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 MPLAD36KP45A reliable?
The price and inventory of MPLAD36KP45A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP45A is usually 5 days.
3.What payment methods are accepted for MPLAD36KP45A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP45A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP45A?
MPLAD36KP45A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP45A 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 MPLAD36KP45A?
For technical support, including MPLAD36KP45A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP45A requirements.
6.How does Aetrix verify that MPLAD36KP45A is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP45A 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 MPLAD36KP45A meets industry standards.
7.What is the process for return or replacement of MPLAD36KP45A?
All MPLAD36KP45A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP45A, 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 MPLAD36KP45A part is unused and in its original packaging.
Return procedure for MPLAD36KP45A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP45A Tags
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