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Microchip Technology MPLAD18KP51A
- Part No.:
- MPLAD18KP51A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP51A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,994
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Product details
Overview
MPLAD18KP51A 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 18,000 W peak pulse power at 10/1000 μs, clamps at ≤82.4 V under 219 A peak impulse current, and features a 51 V reverse standoff voltage (VWM) with 56.7–62.7 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for waveform 4.
For engineers reviewing the MPLAD18KP51A datasheet, MPLAD18KP51A pinout, MPLAD18KP51A application, or MPLAD18KP51A equivalent, key selection criteria include its 51 V working voltage, sub-100 ns clamping response, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and qualification for lightning-level secondary protection per IEC 61000-4-5 with 42 Ω source impedance.
Technical Context
The MPLAD18KP51A employs a silicon avalanche diode structure optimized for fast transient suppression in high-reliability DC power rails. Its unidirectional polarity and metal-base cathode configuration enable low-inductance mounting directly to heatsinks, supporting thermal management under multi-stroke surge conditions.
It operates within –55 °C to +150 °C junction temperature range and is rated for 100% surge testing per lot. The device supports secondary lightning protection per IEC 61000-4-5 across Class 1–5 when used with 42 Ω source impedance, and meets ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) immunity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains full-rated lightning surge energy without degradation |
| Reverse Standoff Voltage (VWM) | 51 V - maximum continuous DC or peak AC voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 56.7–62.7 V @ I(BR) - defines guaranteed avalanche initiation threshold |
| Max Clamping Voltage (VC) | 82.4 V @ 219 A - limits downstream voltage stress during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct heatsink mounting for cumulative multi-stroke thermal management |
| Standby Current (ID) | 10 μA @ 51 V - ensures negligible leakage in standby power rails |
| Clamping Response Time | <100 ps - suppresses fast-rising transients before sensitive circuitry reacts |
Pinout & Package
Package: Surface-mount PLAD (Power Leadless Array Device), void-free UL94V-0 epoxy body with tin-lead or RoHS-compliant matte-tin plating; cathode terminal is the exposed metal base (bottom side); weight ≈1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface pad) | Transient current entry point | Connected to protected line; conducts surge current into cathode during avalanche |
| Cathode (metal base) | Transient current return path & thermal interface | Must be soldered to copper pour or heatsink for thermal dissipation and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge lifetime |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges up to 219 A at 25 °C without failure |
| IEC 61000-4-5 secondary lightning protection (42 Ω) | Rated for Class 1–5 protection in avionics and ground vehicle power distribution |
| Moisture Sensitivity Level 1 | No dry-pack or baking required prior to reflow - simplifies SMT assembly logistics |
| 3σ lot norm screening on ID | Ensures consistent low-leakage performance across production lots for critical standby applications |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC bus in commercial aircraft avionics bays subjected to DO-160F Section 22 multi-stroke lightning transients. IC Role / Device Role / Timing Role: Primary transient shunt element placed at power entry point of flight control modules. Use Value: Limits clamped voltage to ≤82.4 V, protecting downstream DC-DC converters and FPGAs rated for 100 V absolute max. | Use Scenario: 12 V/24 V battery-fed ECUs exposed to ISO 7637-2 load dump pulses up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at connector input to clamp surge before fuse and input filter. Use Value: Absorbs 18 kW peak energy without thermal runaway, enabling single-device protection without parallel stacking. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: 48–60 V DC link in variable-frequency drives where IGBT switching induces repetitive 1–10 kHz transients. IC Role / Device Role / Timing Role: Low-inductance TVS across bus rails to suppress commutation spikes and regenerative energy surges. Use Value: 0.7 °C/W RθJC allows direct PCB copper thermal coupling, sustaining >1000 surge events at 0.05% duty cycle. | Use Scenario: 72 V nominal signaling power supply in EN 50121-3-2 compliant railway control cabinets exposed to traction-induced surges. IC Role / Device Role / Timing Role: Secondary protection stage after MOV-based primary clamping, handling residual fast transients. Use Value: Meets IEC 61000-4-5 Class 4 with 42 Ω source, clamping below 85 V to preserve SELV isolation integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | 600 W PPP rating, 51 V VWM, DO-214AA package, RθJA = 40 °C/W (no case thermal path) | Limited to single-stroke or low-duty-cycle surges; unsuitable for DO-160F multi-stroke or IEC 61000-4-5 Class 4 | Select only for cost-sensitive consumer-grade 24 V systems with <50 A surge exposure. |
| SMCJ51A | 1500 W PPP, 51 V VWM, DO-214AB package, RθJA = 25 °C/W, no RθJC spec | Lacks junction-to-case thermal metric and AEC-Q101 qualification; not tested to RTCA DO-160F | Acceptable for industrial PLC I/O protection where multi-stroke endurance is not required. |
Compared with SMBJ51A and SMCJ51A, the MPLAD18KP51A provides 30× higher peak pulse power, a defined 0.7 °C/W thermal path for heatsink mounting, and formal qualification to aviation and automotive surge standards-making it the only option for mission-critical multi-stroke environments.
Availability
MPLAD18KP51A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive DC bus applications requiring stable component supply across extended product lifecycles.
Supply support for MPLAD18KP51A 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 MPLAD18KP51A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load-dump protection in safety-critical platforms where thermal robustness and standard compliance are mandatory.
FAQ
What is the clamping voltage of the MPLAD18KP51A at its rated peak pulse current?
The MPLAD18KP51A has a maximum clamping voltage (VC) of 82.4 V at 219 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that downstream circuitry sees no more than 82.4 V during worst-case surge events, ensuring compatibility with 100 V-rated components in the same power domain.
Is the MPLAD18KP51A suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the MPLAD18KP51A is fully qualified to AEC-Q101 Rev D for stress testing including HTGB, H3TRB, TC, and surge lifetime. It is explicitly listed in Microsemi's AEC-Q101 documentation and used in automotive ECUs for 12 V/24 V load dump protection where high-reliability transient suppression is mandated.
Does the MPLAD18KP51A have a defined thermal resistance from junction to case (RθJC)?
Yes, the MPLAD18KP51A specifies a junction-to-case thermal resistance of 0.7 °C/W. This parameter is critical for thermal design-it enables direct mounting of the metal base to an external heatsink or large copper plane, allowing sustained multi-stroke operation without thermal runaway, unlike standard SMD TVS diodes lacking a dedicated thermal path.
Can the MPLAD18KP51A be used for RTCA DO-160F Section 22 lightning protection?
Yes, the MPLAD18KP51A is validated for RTCA DO-160F Section 22 multi-stroke lightning testing. It meets Level 4 for pin injection (Waveform 4, 6.4/69 μs) and supports full Class 1–5 secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance-making it suitable for commercial aircraft power entry designs.
What is the polarity and marking convention for the MPLAD18KP51A?
The MPLAD18KP51A is unidirectional, with the cathode located on the exposed metal base (bottom side) and the anode on the top surface pad. Polarity is marked by a band on the top surface indicating the cathode end; however, due to the bottom-cathode construction, correct PCB layout requires routing the cathode pad to system ground or heatsink, while the anode connects to the protected line.
MPLAD18KP51A 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 219A
- Power - Peak Pulse:
- 18000W (18kW)
- 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
MPLAD18KP51A FAQ
1.How can I place an order for MPLAD18KP51A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP51A 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 MPLAD18KP51A reliable?
The price and inventory of MPLAD18KP51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP51A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP51A?
MPLAD18KP51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP51A 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 MPLAD18KP51A?
For technical support, including MPLAD18KP51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP51A requirements.
6.How does Aetrix verify that MPLAD18KP51A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP51A 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 MPLAD18KP51A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP51A?
All MPLAD18KP51A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP51A, 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 MPLAD18KP51A part is unused and in its original packaging.
Return procedure for MPLAD18KP51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP51A Tags
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