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Microchip Technology MPLAD18KP24A
- Part No.:
- MPLAD18KP24A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,753
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Product details
Overview
MPLAD18KP24A 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 ≤38.9 V under 463 A peak current, and features a 24 V reverse standoff voltage (VWM) with 26.7–29.5 V breakdown range. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22 and secondary surge suppression per IEC 61000-4-5.
For engineers reviewing the MPLAD18KP24A datasheet, MPLAD18KP24A pinout, MPLAD18KP24A application, or MPLAD18KP24A equivalent, key selection criteria include its 24 V VWM rating, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, MIL-PRF-19500 upscreening capability, and verified compliance with AEC-Q101 reliability testing.
Technical Context
The MPLAD18KP24A employs a silicon avalanche diode structure optimized for fast response (<5 ns clamping time) and high cumulative stroke endurance. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under multi-pulse lightning transients per RTCA DO-160F Waveform 4 and 5A.
It operates as a unidirectional clamping device with cathode on the metal base (bottom side), requiring correct PCB pad layout per RF01215 Rev B for optimal thermal dissipation and mechanical reliability. Standby leakage is limited to 10 μA at 24 V, and temperature coefficient of V(BR) is +27 mV/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or peak AC voltage the device blocks without conduction |
| V(BR) min/max | 26.7–29.5 V @ I(BR) - Ensures reliable avalanche initiation above operating voltage with margin |
| VC @ IPP | ≤38.9 V @ 463 A - Clamping voltage limits downstream circuit stress during 10/1000 μs surges |
| PPP | 18,000 W @ 10/1000 μs - Enables single-device protection against severe lightning-induced transients |
| RθJC | 0.7 °C/W - Allows efficient heat transfer to external heatsink, critical for multi-stroke duty cycles |
| ID @ VWM | 10 μA max - Ultra-low leakage preserves system standby power integrity |
| Polarity | Unidirectional - Requires correct orientation; cathode on metal base for thermal and electrical reference |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode termination. Dimensions: 12.32 × 10.54 × 5.33 mm (L × W × H), weight ≈1 g. Void-free UL94V-0 epoxy body; matte-tin (e3) RoHS-compliant plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top side) | Positive terminal for forward-biased operation | Connected to protected line; must be routed with low-inductance trace for fast transient response |
| Cathode (metal base) | Reference/return path and thermal interface | Soldered directly to copper pour or heatsink; serves as both electrical return and primary thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Supports single-device compliance with RTCA DO-160 Section 22 Level 4/5 lightning tests without parallel staging |
| 0.7 °C/W RθJC | Enables >70 W steady-state dissipation when mounted on 100°C heatsink-critical for automotive load dump recovery |
| AEC-Q101 qualified | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| MIL-PRF-19500 upscreening option | Available with M, MA, MX, or MXL reliability levels for aerospace programs requiring lot traceability and burn-in |
| IPC/JEDEC J-STD-020B Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints-reduces manufacturing handling overhead |
Applications
| Aircraft Lightning Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting avionics power inputs against multi-stroke lightning transients per RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs). IC Role / Device Role / Timing Role: Primary clamping TVS placed at board-level entry point, with cathode thermally anchored to chassis ground plane. Use Value: Achieves Level 5 protection up to 130 V VWM variants; MPLAD18KP24A supports 24 V systems such as flight control sensors and communication buses. | Use Scenario: Safeguarding 24 V truck/trailer electronic control units (ECUs) during alternator load dump events (ISO 7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Unidirectional surge clamp across battery rail, absorbing up to 18 kW for <100 ms duration without failure. Use Value: Eliminates need for series fusing or derated designs-enables robust 24 V ECU operation in commercial vehicle platforms. |
| Industrial DC Power Input Protection | Secondary Surge Protection per IEC 61000-4-5 |
Use Scenario: Front-end protection for programmable logic controllers (PLCs) and motor drives powered from 24 V DC supplies exposed to long cable runs. IC Role / Device Role / Timing Role: First-line TVS on DIN-rail mounted power input stage, coordinated with upstream MOVs and downstream filtering. Use Value: Withstands repeated 42 Ω source impedance surges (IEC 61000-4-5 Class 4), extending field lifetime in factory automation environments. | Use Scenario: Secondary protection layer in telecom power shelves and base station power supplies subjected to induced surges. IC Role / Device Role / Timing Role: Fast-clamping device placed after primary GDT/MOV stage to limit let-through voltage to <40 V. Use Value: MPLAD18KP24A's 38.9 V clamping ensures safe operation of 24 V-rated DC-DC converters and FET gate drivers downstream. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-024 | Same 24 V VWM and 18 kW PPP rating, but TO-277 package with higher RθJA (60 °C/W) and no AEC-Q101 qualification | Not rated for RTCA DO-160F Level 5; limited to Class 3 IEC 61000-4-5 with 42 Ω source | Select when cost sensitivity outweighs aerospace qualification and thermal performance requirements |
| Vishay SMAJ24A | Lower 400 W PPP rating, SMA package, RθJC not specified; clamps at 38.9 V but only up to 11.6 A IPP | Only suitable for low-energy ESD/EFT (IEC 61000-4-2/4) - not for lightning or load dump | Select only for board-level ESD protection on signal lines, not power rail surge suppression |
Compared with SP1003-024 and SMAJ24A, the MPLAD18KP24A uniquely combines 18 kW surge capacity, AEC-Q101 and RTCA DO-160F compliance, and ultra-low thermal resistance-making it the only viable choice for mission-critical 24 V aerospace and heavy-duty automotive power protection.
Availability
MPLAD18KP24A is available at Aetrix Electronics and suitable for aircraft avionics, commercial vehicle ECUs, and industrial PLC power inputs requiring stable component supply across extended product lifecycles.
Supply support for MPLAD18KP24A 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 MPLAD18KP24A 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 qualification traceability are mandatory.
FAQ
What is the clamping voltage of the MPLAD18KP24A under maximum rated surge current?
The MPLAD18KP24A has a maximum clamping voltage (VC) of 38.9 V at its peak pulse current (IPP) of 463 A under 10/1000 μs waveform conditions. This value is guaranteed per the RF01215 Rev B datasheet and ensures downstream 24 V components remain within safe operating voltage margins during surge events.
Is the MPLAD18KP24A suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the MPLAD18KP24A is explicitly tested and qualified to AEC-Q101 standards as stated in the RF01215 Rev B datasheet. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge endurance-making it appropriate for under-hood and chassis-mounted 24 V automotive ECUs.
How is thermal management implemented for the MPLAD18KP24A in high-duty-cycle applications?
The MPLAD18KP24A uses its metal base as the cathode and primary thermal interface. With a junction-to-case thermal resistance of 0.7 °C/W, effective heat removal requires soldering the base directly to a large copper pour or external heatsink. The recommended pad layout in RF01215 Rev B must be followed to maintain thermal performance and mechanical reliability.
Does the MPLAD18KP24A meet RTCA DO-160F lightning protection requirements?
Yes, the MPLAD18KP24A is validated for RTCA DO-160F Section 22 lightning test levels: it supports Level 4 for Waveform 4 (6.4/69 μs) and Level 4 for Waveform 5A (40/120 μs) at 24 V standoff. Full Level 5 capability applies to variants up to MPLAD18KP130CA; MPLAD18KP24A meets Level 4 with margin.
What is the polarity configuration and mounting orientation for the MPLAD18KP24A?
The MPLAD18KP24A is unidirectional, with the cathode located on the metal base (bottom side) and the anode on the top surface. Correct orientation is essential: the metal base must be soldered to the system ground or heatsink, while the top anode connects to the protected line. Polarity marking is absent-orientation is defined by package geometry per RF01215 Rev B.
MPLAD18KP24A 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 463A
- 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
MPLAD18KP24A FAQ
1.How can I place an order for MPLAD18KP24A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP24A 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 MPLAD18KP24A reliable?
The price and inventory of MPLAD18KP24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP24A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP24A?
MPLAD18KP24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP24A 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 MPLAD18KP24A?
For technical support, including MPLAD18KP24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP24A requirements.
6.How does Aetrix verify that MPLAD18KP24A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP24A 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 MPLAD18KP24A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP24A?
All MPLAD18KP24A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP24A, 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 MPLAD18KP24A part is unused and in its original packaging.
Return procedure for MPLAD18KP24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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