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Microchip Technology MAPLAD18KP40CAE3
- Part No.:
- MAPLAD18KP40CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP40CAE3.pdf
- Description:
- TVS DIODE 40VWM 64.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,654
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Product details
Overview
MAPLAD18KP40CAE3 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps transients to ≤64.5 V at 280 A, and features a 40 V reverse standoff voltage (VWM), 44.4–49.1 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance.
For engineers reviewing the MAPLAD18KP40CAE3 datasheet, MAPLAD18KP40CAE3 pinout, MAPLAD18KP40CAE3 application, or MAPLAD18KP40CAE3 equivalent, key selection criteria include its DO-160F Waveform 4 & 5A compliance (Level 4/5), IEC 61000-4-5 secondary lightning protection (42 Ω/12 Ω/2 Ω source), RTCA/DO-160 Section 22 multi-stroke capability, and RoHS-compliant e3 termination.
Technical Context
This TVS employs an avalanche diode structure optimized for low clamping ratio and fast response (<5 ns rise time), enabling effective suppression of lightning-induced surges, load dump transients, and ESD/EFT events per IEC 61000-4-2/4-4. Its metal-base package provides direct thermal path to PCB copper or heatsink, supporting sustained operation under repetitive 0.05% duty cycle impulses.
The device is rated for -55°C to +150°C junction temperature, meets AEC-Q101 stress testing requirements, and supports MIL-PRF-19500 upscreening options (M/MA/MXL levels). Polarity is defined by cathode on metal base - critical for correct PCB layout and grounding in bidirectional configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - enables single-device protection against severe lightning strikes and automotive load dump without external heat sinking |
| Reverse Standoff Voltage (VWM) | 40 V - maximum continuous DC or RMS operating voltage before clamping initiates; matches 28 V aircraft bus and 36 V industrial systems |
| Clamping Voltage (VC) | 64.5 V @ 280 A - limits downstream circuit voltage during surge, ensuring compatibility with 75 V-rated components |
| Breakdown Voltage (V(BR)) | 44.4–49.1 V @ I(BR) - defines precise avalanche onset threshold; tight 10.5% tolerance ensures predictable turn-on behavior |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - allows >71 W steady-state dissipation at TC = 100°C; enables high-reliability operation in thermally constrained enclosures |
| Surge Current (IPP) | 280 A @ 10/1000 μs - validates robustness against IEC 61000-4-5 Class 4 (42 Ω source) and DO-160F Level 4 (6.4/69 μs) |
| Response Time | <5 ns - ensures sub-nanosecond turn-on for ESD and fast-rising RFI transients, protecting sensitive analog and digital inputs |
Pinout & Package
MAPLAD18KP40CAE3 uses a surface-mount PLAD package with metal base acting as cathode terminal (bidirectional configuration). The package measures 12.32 × 10.54 × 5.08 mm (L × W × H) and features tin-lead or RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode (Bidirectional Common Terminal) | Serves as primary thermal conduction path and electrical reference; must be soldered to large copper pour or heatsink for thermal management |
| Top Surface Pad | Anode (Bidirectional Common Terminal) | Provides symmetrical surge conduction path; polarity-independent clamping requires no orientation-dependent routing |
Key Features
| Feature | Design Value |
|---|---|
| DO-160F Section 22 Multi-Stroke Compliance | Validated for ≥1000 lightning strike repetitions without degradation - essential for avionics longevity certification |
| IEC 61000-4-5 Secondary Lightning Protection | Class 1–5 compliant with 42 Ω, 12 Ω, and 2 Ω source impedances - covers full spectrum of system-level surge test requirements |
| RTCA/DO-160F Pin Injection (Waveform 4 & 5A) | Level 4 (6.4/69 μs) and Level 5 (40/120 μs) validated - protects against induced transients in flight control and navigation systems |
| AEC-Q101 Qualified | Passed stress tests including HTGB, HTRB, and temperature cycling - confirms suitability for automotive under-hood applications |
| Moisture Sensitivity Level 1 | No dry pack required per J-STD-020B - eliminates baking step and reduces assembly cost and risk of popcorning |
Applications
| Aerospace Avionics Power Bus | Automotive 24 V Load Dump Protection |
|---|---|
Use Scenario: Protecting flight control computers and sensor interfaces on 28 V DC aircraft buses subjected to lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power input rails to clamp transients before they reach DC/DC converters and microcontrollers. Use Value: Enables compliance with RTCA/DO-160F Level 4/5 pin injection and multi-stroke lightning standards without derating or parallel devices. |
Use Scenario: Safeguarding engine control units (ECUs) and ADAS modules during alternator load dump events in commercial trucks and off-highway vehicles. IC Role / Device Role / Timing Role: Primary surge suppression element connected between battery rail and protected subsystem, absorbing up to 18 kW pulses. Use Value: Prevents latch-up and permanent damage in 48 V-compatible electronics by limiting clamped voltage to 64.5 V at 280 A. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: Shielding gate drivers and current sensors on 40–60 V DC link rails in variable frequency drives exposed to switching transients and EFT noise. IC Role / Device Role / Timing Role: Low-inductance TVS mounted directly at power entry point to minimize loop area and suppress nanosecond-scale spikes. Use Value: Reduces need for additional RC snubbers by providing <5 ns response and 0.7 °C/W thermal resistance for sustained surge handling. |
Use Scenario: Securing track-side signaling equipment connected to long cable runs vulnerable to induced lightning surges per EN 50121-4. IC Role / Device Role / Timing Role: Bidirectional protection on RS-485/RS-232 data lines and 24 V auxiliary power inputs in wayside cabinets. Use Value: Meets IEC 61000-4-5 Class 4 (42 Ω) and Class 3 (12 Ω) requirements while maintaining signal integrity through low capacitance design. |
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 SMAJ40CA | Lower PPP (400 W), smaller SMA package, higher RθJA (65 °C/W), no DO-160F validation | Not suitable for aerospace multi-stroke or automotive load dump; limited to consumer/industrial board-level ESD | Select when cost and size constrain requirements and full 18 kW surge rating is unnecessary |
| Vishay V260CH8 | Higher VWM (260 V), same PLAD package, 18 kW PPP, but unidirectional only and no DO-160F documentation | Applicable for high-voltage DC systems (e.g., solar inverters) but cannot replace bidirectional function in avionics bus protection | Choose only for unidirectional 260 V applications where polarity-specific clamping is acceptable |
Compared with MAPLAD18KP40CAE3, SMAJ40CA offers compact size at the expense of 45× lower surge capacity and no aviation qualification, while V260CH8 provides identical power handling but lacks bidirectionality and aerospace compliance - making MAPLAD18KP40CAE3 uniquely suited for certified safety-critical 40 V bidirectional protection.
Availability
MAPLAD18KP40CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU, industrial motor drive, and railway signaling applications requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.
Supply support for MAPLAD18KP40CAE3 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 MAPLAD18KP40CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for mission-critical surge protection in environments demanding DO-160F, AEC-Q101, and IEC 61000-4-5 compliance.
FAQ
What is the clamping voltage of MAPLAD18KP40CAE3 at its rated peak pulse current?
The MAPLAD18KP40CAE3 has a maximum clamping voltage (VC) of 64.5 V at 280 A peak pulse current under 10/1000 μs waveform conditions. This value is measured per standard test methods and ensures downstream components see no more than 64.5 V during worst-case surge events, making MAPLAD18KP40CAE3 suitable for protecting 75 V-rated circuits in aerospace and industrial systems.
Is MAPLAD18KP40CAE3 qualified for automotive applications?
Yes, MAPLAD18KP40CAE3 is AEC-Q101 qualified and tested for high-temperature operation, humidity, and mechanical stress. Its 40 V VWM and 64.5 V clamping align with 24 V/36 V automotive architectures, and it supports load dump protection per ISO 7637-2 Pulse 5a/b. MAPLAD18KP40CAE3 is commonly used in engine control units and ADAS modules where reliability under thermal cycling is critical.
Does MAPLAD18KP40CAE3 meet RTCA/DO-160F lightning protection requirements?
Yes, MAPLAD18KP40CAE3 is validated for RTCA/DO-160F Section 22 multi-stroke lightning testing and pin injection (Waveform 4 at 6.4/69 μs and Waveform 5A at 40/120 μs) up to Level 5. Its 18,000 W PPP rating and bidirectional construction make MAPLAD18KP40CAE3 appropriate for primary and secondary surge protection in certified avionics equipment.
What is the thermal resistance and how does it affect PCB layout for MAPLAD18KP40CAE3?
MAPLAD18KP40CAE3 has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W, achieved via its metal-base construction. To realize this performance, the metal base must be soldered to a minimum 10 cm² copper pour or attached to an external heatsink. Inadequate copper area increases effective thermal resistance and risks exceeding 150°C junction temperature during repetitive surges - a key design consideration for MAPLAD18KP40CAE3 layout.
How does the bidirectional construction of MAPLAD18KP40CAE3 impact its use in DC power rails?
The bidirectional design of MAPLAD18KP40CAE3 allows symmetric clamping regardless of voltage polarity, making it ideal for AC-coupled signals or DC rails where reverse voltage transients may occur. Unlike unidirectional TVS diodes, MAPLAD18KP40CAE3 does not require polarity-aware placement - simplifying layout and eliminating risk of incorrect orientation during assembly while maintaining full 18 kW surge capability in both directions.
MAPLAD18KP40CAE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 280A
- 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
MAPLAD18KP40CAE3 FAQ
1.How can I place an order for MAPLAD18KP40CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP40CAE3 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 MAPLAD18KP40CAE3 reliable?
The price and inventory of MAPLAD18KP40CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP40CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP40CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP40CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP40CAE3?
MAPLAD18KP40CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP40CAE3 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 MAPLAD18KP40CAE3?
For technical support, including MAPLAD18KP40CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP40CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP40CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP40CAE3 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 MAPLAD18KP40CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP40CAE3?
All MAPLAD18KP40CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP40CAE3, 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 MAPLAD18KP40CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP40CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP40CAE3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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