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Microchip Technology MPLAD18KP43AE3
- Part No.:
- MPLAD18KP43AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP43AE3.pdf
- Description:
- TVS DIODE 43VWM 69.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,662
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Product details
Overview
MPLAD18KP43AE3 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 ≤69.4 V under 260 A peak impulse current, and features a 43 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (47.8–52.8 V). It is RoHS-compliant (e3), qualified to AEC-Q101, and widely deployed in aircraft lightning protection per RTCA DO-160F Waveform 4 Level 4.
For engineers reviewing the MPLAD18KP43AE3 datasheet, MPLAD18KP43AE3 pinout, MPLAD18KP43AE3 application, or MPLAD18KP43AE3 equivalent, this device is selected for high-reliability secondary lightning protection, load dump suppression, and ESD/EFT hardening where low thermal resistance (RθJC = 0.7 °C/W), metal-base cathode thermal path, and IEC 61000-4-5 compliance at 2/12/42 Ω source impedances are critical.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector with avalanche breakdown behavior. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained energy dissipation under multi-stroke transients. The device meets RTCA DO-160F Section 22 lightning standards and IEC 61000-4-5 Class 1–5 surge immunity when configured with appropriate source impedance.
It exhibits a temperature coefficient of breakdown voltage (αV(BR)) of +49 mV/°C and maintains <100 ps response time from 0 V to V(BR) min. Standby leakage (ID) is ≤10 μA at 43 V, and forward clamping voltage is 2.0 V at 500 A - enabling robust protection without interfering with normal circuit operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without failure in single-event or low-duty-cycle multi-stroke scenarios |
| Reverse Standoff Voltage (VWM) | 43 V - maximum continuous DC or RMS operating voltage before clamping initiates; matches 36–48 V nominal bus systems |
| Breakdown Voltage (V(BR)) | 47.8–52.8 V @ I(BR) - tight 5% tolerance ensures predictable turn-on margin above VWM |
| Max Clamping Voltage (VC) | 69.4 V @ IPP = 260 A - defines worst-case protected-line voltage during surge; limits downstream component stress |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink, critical for repeated surge duty |
| Standby Leakage Current | ≤10 μA @ 43 V - negligible power loss and signal interference in standby or low-power modes |
| Response Time | <100 ps - sub-nanosecond turn-on ensures protection of fast-edge digital and RF circuits |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base acting as cathode terminal. Void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; weight ≈1 g; dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top-side lead) | Positive surge return path | Connected to protected line; carries full IPP during clamping; requires adequate trace width and thermal relief |
| Cathode (Metal base) | Ground reference / heat sink interface | Must be soldered to large copper pour or heatsink; serves dual role as electrical return and primary thermal path (RθJC = 0.7 °C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device protection against severe lightning-induced surges (RTCA DO-160F Level 4/5) and automotive load dump (ISO 7637-2) |
| Metal-base thermal architecture | Reduces junction-to-ambient thermal resistance by >85% vs. standard SMD TVS, allowing higher surge repetition rates without derating |
| AEC-Q101 qualification | Validates reliability for automotive under-hood applications including engine control units and battery management systems |
| IEC 61000-4-5 compliance (2/12/42 Ω) | Supports system-level surge immunity certification across Class 1–5 test levels without additional external components |
| RoHS-compliant e3 marking | Meets global environmental regulations; matte-tin plating ensures compatibility with Pb-free reflow profiles and long-term solderability |
Applications
| Aircraft Avionics Power Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC power inputs on flight-critical avionics modules subjected to lightning-induced transients per RTCA DO-160F Section 22. IC Role / Device Role / Timing Role: Primary clamping TVS placed at board edge to shunt surge energy directly to chassis ground via metal base. Use Value: Achieves Waveform 4 Level 4 compliance (6.4/69 μs) with no additional filtering, reducing BOM count and board space while maintaining <100 ps response. | Use Scenario: Safeguarding 12 V/24 V supply rails in engine control units exposed to ISO 7637-2 load dump pulses up to 120 V/400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS mounted between battery rail and ground plane, leveraging metal base for thermal coupling to aluminum housing. Use Value: Absorbs 18 kW peak energy without degradation, eliminating need for parallel TVS arrays and enabling compact, high-density ECU designs. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Interface |
Use Scenario: Protecting 48–60 V DC bus lines in variable-frequency drives from switching transients and induced RFI during IGBT commutation. IC Role / Device Role / Timing Role: High-power TVS placed across bus terminals to clamp voltage overshoots exceeding 1.5× nominal bus voltage. Use Value: Withstands 260 A peak impulse at 69.4 V clamping, preventing gate driver IC damage and ensuring uninterrupted motor operation during fault conditions. | Use Scenario: Hardening 72 V DC signaling interfaces in railway trackside electronics against EFT bursts (IEC 61000-4-4) and secondary lightning (IEC 61000-4-5 Class 3). IC Role / Device Role / Timing Role: Bidirectional-capable variant used in differential pair protection; unidirectional MPLAD18KP43AE3 applied to single-ended power input. Use Value: Delivers <10 μA leakage at 43 V standoff, preserving low-power sleep mode integrity while meeting EN 50121-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | 600 W PPP rating, SMA package, RθJA ≈ 40 °C/W, no metal-base thermal path | Limited to single-stroke or low-energy events; unsuitable for RTCA DO-160F multi-stroke or automotive load dump | Select only for cost-sensitive, low-surge industrial sensors where 18 kW capability is unnecessary |
| SMCJ43A | 1500 W PPP, SMC package, RθJC ≈ 2.5 °C/W, plastic case only | Cannot meet 18 kW requirement; lacks AEC-Q101 qualification and DO-160F certification data | Use only in non-automotive, non-aerospace applications with verified surge energy <1.5 kJ |
Compared with SMBJ43A and SMCJ43A, the MPLAD18KP43AE3 provides 30× higher peak pulse power, 3.5× lower junction-to-case thermal resistance, and formal qualification for aerospace lightning standards - making it irreplaceable in mission-critical surge environments where single-point failure is unacceptable.
Availability
MPLAD18KP43AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and certified surge performance.
Supply support for MPLAD18KP43AE3 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 solutions for aerospace, defense, and industrial markets.
The MPLAD series was developed specifically for high-energy transient suppression in safety-critical platforms, emphasizing thermal robustness, multi-stroke endurance, and regulatory compliance for DO-160, ISO 7637, and IEC 61000-4-x standards.
FAQ
What is the clamping voltage of MPLAD18KP43AE3 at its rated peak pulse current?
The MPLAD18KP43AE3 has a maximum clamping voltage (VC) of 69.4 V at 260 A peak pulse current (IPP), measured under 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during surge events and is guaranteed across the full operating temperature range. The MPLAD18KP43AE3 achieves this clamping performance while maintaining sub-100 ps response time and low thermal resistance.
Is MPLAD18KP43AE3 qualified for automotive applications?
Yes, the MPLAD18KP43AE3 is AEC-Q101 qualified, confirming its suitability for automotive under-hood and powertrain applications including engine control units, battery management systems, and ADAS power supplies. Its construction supports operation from −55 °C to +150 °C, and its 18 kW surge rating addresses ISO 7637-2 load dump requirements. The MPLAD18KP43AE3 also meets humidity robustness (IPC/JEDEC J-STD-020B Level 1) and solderability standards.
How does the metal base of MPLAD18KP43AE3 improve thermal performance?
The metal base of the MPLAD18KP43AE3 serves as both the cathode terminal and primary thermal conduction path, delivering a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W. This is over 3× better than conventional plastic-body TVS diodes and allows direct mounting to heatsinks or large PCB copper areas. As a result, the MPLAD18KP43AE3 sustains repeated 18 kW surges without thermal runaway - a key advantage for systems requiring multi-stroke lightning protection per RTCA DO-160F.
Does MPLAD18KP43AE3 meet IEC 61000-4-5 for different source impedances?
Yes, the MPLAD18KP43AE3 is validated for IEC 61000-4-5 secondary lightning protection across multiple source impedances: it supports Class 1–5 at 42 Ω, Class 1–4 at 12 Ω, and Class 2–3 at 2 Ω. This multi-impedance compliance enables use in diverse system architectures - from telecom power supplies (42 Ω) to industrial PLCs (12 Ω) and rail signaling (2 Ω). The MPLAD18KP43AE3's consistent clamping behavior ensures predictable protection regardless of source impedance.
What is the polarity configuration and marking convention for MPLAD18KP43AE3?
The MPLAD18KP43AE3 is a unidirectional TVS diode, indicated by the "A" suffix (vs. "CA" for bidirectional). Its cathode is the metal base (underside), and the anode is the top-side lead. Polarity is marked on the body per Microsemi standard: the cathode side is unmarked, while the anode side may include part number and polarity indicator. The "E3" suffix confirms RoHS-compliant matte-tin plating. This configuration ensures correct orientation during PCB layout to avoid reverse-bias failure.
MPLAD18KP43AE3 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 260A
- 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
MPLAD18KP43AE3 FAQ
1.How can I place an order for MPLAD18KP43AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP43AE3 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 MPLAD18KP43AE3 reliable?
The price and inventory of MPLAD18KP43AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP43AE3 is usually 5 days.
3.What payment methods are accepted for MPLAD18KP43AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP43AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP43AE3?
MPLAD18KP43AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP43AE3 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 MPLAD18KP43AE3?
For technical support, including MPLAD18KP43AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP43AE3 requirements.
6.How does Aetrix verify that MPLAD18KP43AE3 is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP43AE3 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 MPLAD18KP43AE3 meets industry standards.
7.What is the process for return or replacement of MPLAD18KP43AE3?
All MPLAD18KP43AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP43AE3, 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 MPLAD18KP43AE3 part is unused and in its original packaging.
Return procedure for MPLAD18KP43AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP43AE3 Tags
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