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Microchip Technology MAPLAD18KP40AE3
- Part No.:
- MAPLAD18KP40AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP40AE3.pdf
- Description:
- TVS DIODE 40VWM 64.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,026
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Product details
Overview
MAPLAD18KP40AE3 from Microsemi is a surface-mount unidirectional transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 40 V reverse standoff voltage (VWM), clamps to ≤64.5 V at 280 A peak impulse current (IPP), and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 lightning standards. It is used in aircraft avionics power input stages for secondary lightning protection.
For engineers reviewing the MAPLAD18KP40AE3 datasheet, MAPLAD18KP40AE3 pinout, MAPLAD18KP40AE3 application, or MAPLAD18KP40AE3 equivalent, this page provides verified electrical parameters, thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 plating, polarity marking (cathode on metal base), and compliance with AEC-Q101 and MIL-PRF-19500 upscreening options.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating above its breakdown voltage (V(BR) = 44.4–49.1 V) to divert surge energy to ground. Its low RθJC (0.7 °C/W) enables effective heat transfer to a heatsink or PCB copper plane, supporting multi-stroke surge endurance per RTCA DO-160 Section 22.
It is characterized for 10/1000 μs waveform testing, with clamping voltage VC = 64.5 V max at IPP = 280 A, and exhibits a temperature coefficient of breakdown voltage αV(BR) = 45 mV/°C - critical for stable performance across -55°C to +150°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains high-energy lightning transients without failure |
| Reverse Standoff Voltage (VWM) | 40 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (V(BR)) | 44.4–49.1 V @ I(BR) - precise turn-on threshold ensures reliable overvoltage detection |
| Clamping Voltage (VC) | ≤64.5 V @ IPP = 280 A - limits downstream voltage stress during surge events |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables efficient junction-to-case heat dissipation for repeated surge duty |
| Standby Current (ID) | ≤10 μA @ VWM - negligible leakage preserves system efficiency in standby |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack required, simplifies SMT handling and storage |
Pinout & Package
The MAPLAD18KP40AE3 uses a surface-mount plastic package with metal base cathode termination. The case is void-free thermosetting epoxy (UL94V-0), and terminals feature RoHS-compliant matte-tin plating (e3). Polarity is marked: cathode is the metal base (bottom side); anode is the top-side metallized pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary current return path during clamping; must be soldered to large copper pour or heatsink for thermal management |
| Top Metallized Pad | Anode | Input connection point for protected line; routing must minimize inductance to preserve clamping speed |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer lot traceability | Enables full process traceability for aerospace and defense programs requiring AS9100-compliant sourcing |
| Surge-tested per IEC 61000-4-5 & RTCA DO-160F | Validated for Level 4 pin injection (Waveform 4) and Class 1–5 secondary lightning protection in aircraft systems |
| Low-profile SMT package | Height ≤ 0.025" (0.64 mm) - fits space-constrained avionics modules while maintaining 18 kW capability |
| AEC-Q101 qualified | Qualified for automotive underhood applications including load dump protection in 12 V/24 V systems |
| Optional MIL-PRF-19500 upscreening | Supports M, MA, MX, MXL reliability levels for mission-critical military and spaceborne electronics |
Applications
| Aircraft Avionics Power Input | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 28 V DC power inputs in flight control computers subjected to lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping TVS placed upstream of DC-DC converters and EMI filters. Use Value: Limits transient voltage to ≤64.5 V during 18 kW surges, preventing latch-up or damage to downstream ASICs and FPGAs. | Use Scenario: Load dump suppression on 12 V battery-fed engine control units exposed to alternator voltage spikes up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS connected between battery rail and chassis ground. Use Value: Clamps 120 V transients within nanoseconds, maintaining safe voltage margin for 3.3 V/5 V microcontrollers and CAN transceivers. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Surge protection on 400 V DC bus lines in variable-frequency drives subject to switching transients and induced RFI. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 10/1000 μs energy bursts from IGBT commutation. Use Value: Withstands cumulative heating via RθJC = 0.7 °C/W and 50 °C/W RθJA, enabling >1000 surge cycles without degradation. | Use Scenario: Secondary protection for Ethernet and RS-485 interfaces in trackside signaling cabinets exposed to induced lightning currents. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MAPLAD18KP40CAE3) used in differential pair protection networks. Use Value: Meets IEC 61000-4-5 Class 4 (42 Ω source) with clamping <64.5 V, preserving signal integrity for 10 Mbps data links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A | 600 W PPP rating, 5.0 mm × 3.5 mm SMB package, RθJC ≈ 25 °C/W | Designed for consumer/industrial use; not qualified to DO-160 or AEC-Q101 | Select when cost sensitivity outweighs aerospace/automotive qualification requirements |
| SMCJ40A | 1500 W PPP rating, larger SMC package, higher clamping voltage (VC = 64.5 V same, but IPP = 23.5 A only) | Limited to lower-energy transients; lacks RTCA DO-160F validation | Choose for non-certified industrial controls where footprint allows larger package |
Compared with SMBJ40A and SMCJ40A, MAPLAD18KP40AE3 delivers 30× higher peak pulse power in a similarly compact footprint, supports certified multi-stroke lightning immunity, and provides traceable high-reliability manufacturing - making it uniquely suited for safety-critical airborne and automotive power systems.
Availability
MAPLAD18KP40AE3 is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECU power protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and certified surge performance.
Supply support for MAPLAD18KP40AE3 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) designs high-reliability semiconductor solutions for aerospace, defense, communications, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and power protection components.
The PLAD family, including MAPLAD18KP40AE3, was engineered specifically for high-power, surface-mount transient suppression in certified aviation and automotive systems - prioritizing multi-stroke endurance, thermal robustness, and qualification-grade traceability.
FAQ
What is the clamping voltage of MAPLAD18KP40AE3 at its rated peak pulse current?
The MAPLAD18KP40AE3 has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak impulse current (IPP) of 280 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MAPLAD18KP40AE3 maintains this clamping performance across its full operating temperature range (-55°C to +150°C).
Is MAPLAD18KP40AE3 qualified for automotive applications?
Yes, MAPLAD18KP40AE3 is tested and qualified to AEC-Q101 for automotive applications. It is specifically validated for load dump protection in 12 V and 24 V vehicle systems, meeting stringent reliability and surge endurance requirements. Its construction - including wafer lot traceability, surge testing, and RoHS-compliant e3 plating - aligns with automotive electronics quality standards. MAPLAD18KP40AE3 is deployed in engine control units and body control modules where high-energy transient immunity is mandatory.
How does the thermal design of MAPLAD18KP40AE3 support repeated surge events?
MAPLAD18KP40AE3 achieves thermal robustness through a low junction-to-case thermal resistance (RθJC = 0.7 °C/W), enabling rapid heat transfer from the silicon die to the metal base and into the PCB copper or external heatsink. When mounted per recommended pad layout on FR4 with thermal vias, it sustains multi-stroke surge duty per RTCA DO-160 Section 22. Derating curves (Figure 6) confirm stable 18 kW performance up to 100°C case temperature. MAPLAD18KP40AE3's thermal design eliminates need for auxiliary cooling in most avionics and automotive implementations.
Does MAPLAD18KP40AE3 meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP40AE3 is explicitly validated for RTCA DO-160F Section 22 lightning-induced transient protection. It meets Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 per the manufacturer's specification table. Its 18,000 W peak pulse power rating, low clamping voltage, and controlled thermal response ensure compliance with multi-stroke lightning standards required for commercial aircraft avionics. MAPLAD18KP40AE3 is referenced directly in RF01215 Rev B for these certifications.
What is the polarity configuration and marking convention for MAPLAD18KP40AE3?
MAPLAD18KP40AE3 is a unidirectional TVS diode with cathode on the metal base (bottom side) and anode on the top metallized pad. Polarity is marked by the device orientation: the cathode must be soldered to ground or low-impedance return path, while the anode connects to the line being protected. The part number "MAPLAD18KP40AE3" is laser-marked on the top surface, and the "A" suffix confirms unidirectional construction (versus "CA" for bidirectional). This polarity configuration is essential for correct clamping behavior in DC systems.
MAPLAD18KP40AE3 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):
- 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
MAPLAD18KP40AE3 FAQ
1.How can I place an order for MAPLAD18KP40AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP40AE3 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 MAPLAD18KP40AE3 reliable?
The price and inventory of MAPLAD18KP40AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP40AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP40AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP40AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP40AE3?
MAPLAD18KP40AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP40AE3 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 MAPLAD18KP40AE3?
For technical support, including MAPLAD18KP40AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP40AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP40AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP40AE3 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 MAPLAD18KP40AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP40AE3?
All MAPLAD18KP40AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP40AE3, 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 MAPLAD18KP40AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP40AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP40AE3 Tags
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