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Microchip Technology MAPLAD18KP18AE3
- Part No.:
- MAPLAD18KP18AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP18AE3.pdf
- Description:
- TVS DIODE 18VWM 29.2VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,117
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Product details
Overview
MAPLAD18KP18AE3 from Microsemi is a unidirectional surface-mount 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 18 V reverse standoff voltage (VWM), clamps to ≤29.2 V at 617 A peak current, and operates across –55°C to +150°C junction temperature.
For engineers reviewing the MAPLAD18KP18AE3 datasheet, MAPLAD18KP18AE3 pinout, MAPLAD18KP18AE3 application, or MAPLAD18KP18AE3 equivalent, key selection criteria include its DO-160F Waveform 4 Level 4 compliance, IEC 61000-4-5 Class 1–5 secondary lightning protection capability, low 0.7°C/W junction-to-case thermal resistance, and RoHS-compliant e3 matte-tin plating.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp transients within nanoseconds, with <5 ns response time for bidirectional variants and sub-100 ps for unidirectional operation. Its thermally optimized metal-base package enables direct heat sinking, supporting sustained multi-stroke surge events per RTCA DO-160 Section 22.
Designed for secondary protection downstream of primary gas discharge tubes or MOVs, it meets IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT (40 A), and IEC 61000-4-5 surge (42 Ω, 12 Ω, and 2 Ω source impedances) - with validated performance up to Class 5 at 42 Ω and Class 4 at 2 Ω for specific VWM ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft lightning-induced surges without failure |
| Reverse Standoff Voltage (VWM) | 18 V - matches nominal 12 V automotive or avionics bus operating voltage |
| Max Clamping Voltage (VC) | 29.2 V @ 617 A - ensures protected ICs remain below absolute maximum ratings during surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Operating Temperature Range | –55°C to +150°C - qualified for under-hood, engine bay, and flight-critical environments |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack or bake required before SMT reflow |
| RoHS Compliance | e3 matte-tin plating - lead-free, solderable per MIL-STD-750 Method 2026 |
Pinout & Package
MAPLAD18KP18AE3 uses a surface-mount PLAD package with exposed metal cathode base for thermal and electrical grounding. The device has two terminals: anode (top-side marked side) and cathode (unmarked metal bottom surface).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (for unidirectional operation) | Connected to protected line; current flows into anode during positive surge |
| Cathode | Current return path and thermal interface | Mounted directly to PCB copper pour or heatsink; serves as primary thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin-injection transients at 18 V VWM - critical for avionics signal line protection |
| IEC 61000-4-5 Class 5 support (42 Ω) | Withstands 4 kV surge with 42 Ω source impedance - meets highest secondary lightning immunity tier |
| Low-profile thermally enhanced package | 0.470″ × 0.230″ footprint with 0.100″ height - fits space-constrained avionics modules |
| 3σ lot norm screening on ID | Standby leakage current controlled to ≤10 μA @ 18 V - ensures low power system standby integrity |
| AEC-Q101 qualified | Stress-tested per automotive-grade reliability standard - suitable for under-hood ECUs and ADAS sensors |
Applications
| Aircraft Avionics Power Bus Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC power inputs of flight management computers and inertial navigation units against lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Secondary TVS clamp placed after primary GDT/MOV, responding within <100 ps to limit bus voltage to safe levels. Use Value: Enables compliance with RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 5 - eliminating need for additional cascaded protection stages. | Use Scenario: Safeguarding 12 V supply rails in gasoline/diesel engine control modules exposed to load dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS absorbing 18 kW pulses while maintaining <29.2 V clamping to protect MCU and CAN transceivers. Use Value: Achieves AEC-Q101 qualification and withstands repetitive 10/1000 μs surges without parametric shift - extending field life in harsh thermal cycles. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: Clamping switching transients on 400 V DC link buses in variable-frequency drives during IGBT turn-off events. IC Role / Device Role / Timing Role: High-power TVS placed across DC bus capacitors to suppress dV/dt spikes exceeding 1 kV/μs. Use Value: 0.7 °C/W RθJC enables direct mounting to aluminum heatsink - sustaining >1000 surge events at 0.05% duty cycle without thermal runaway. | Use Scenario: Protecting Ethernet and RS-485 communication ports in trackside signaling controllers from induced surges during nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional variant (MAPLAD18KP18CA) used for data line protection; unidirectional version applied to power input rails. Use Value: Validated for IEC 61000-4-5 testing at 12 Ω and 2 Ω source impedances - meeting EN 50121-4 immunity requirements for railway electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | 600 W PPP rating, SMB package, RθJA = 40°C/W, no DO-160 qualification | Limited to consumer/industrial grade; not suitable for aviation or automotive safety-critical use | Select only for cost-sensitive non-safety applications where 18 kW surge capacity is unnecessary |
| SMCJ18A | 1500 W PPP, SMC package, RθJC ≈ 1.5°C/W, AEC-Q101 qualified but not DO-160 tested | Supports automotive under-hood use but lacks aircraft lightning waveform validation | Use when DO-160 compliance is not required and peak surge energy is ≤1.5 kW |
Compared with SMBJ18A and SMCJ18A, MAPLAD18KP18AE3 provides 30× higher peak pulse power, certified DO-160F Waveform 4 Level 4 performance, and 2.1× lower junction-to-case thermal resistance - making it the only option qualified for multi-stroke lightning protection in flight-critical systems.
Availability
MAPLAD18KP18AE3 is available at Aetrix Electronics and suitable for aircraft avionics, automotive engine control units, and industrial motor drive designs requiring stable component supply, long-term lifecycle assurance, and traceable high-reliability sourcing.
Supply support for MAPLAD18KP18AE3 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, RF, timing, and radiation-hardened solutions for aerospace, defense, and industrial markets.
The MAPLAD series was developed specifically for high-energy transient suppression in safety-critical platforms, emphasizing DO-160, AEC-Q101, and IEC 61000-4-x compliance with thermally robust surface-mount packaging.
FAQ
What is the clamping voltage of MAPLAD18KP18AE3 at its rated peak pulse current?
The MAPLAD18KP18AE3 has a maximum clamping voltage (VC) of 29.2 V at 617 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and ensures protected downstream circuitry remains within safe operating voltage limits during surge events.
Is MAPLAD18KP18AE3 qualified for automotive applications?
Yes, MAPLAD18KP18AE3 is AEC-Q101 qualified and rated for operation from –55°C to +150°C, making it suitable for under-hood automotive applications such as engine control units and battery management systems. Its 18 kW surge capability also addresses ISO 7637-2 load dump requirements beyond standard AEC-Q101 stress tests.
Does MAPLAD18KP18AE3 meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP18AE3 is validated for RTCA DO-160F Section 22 lightning-induced transient testing, including Waveform 4 (6.4/69 μs) at Level 4 and Waveform 5A (40/120 μs) at Level 4 for VWM up to 18 V. This certification confirms its suitability for primary or secondary protection in commercial and military avionics systems.
What is the thermal resistance and recommended mounting method for MAPLAD18KP18AE3?
MAPLAD18KP18AE3 has a junction-to-case thermal resistance (RθJC) of 0.7°C/W. It must be mounted with the metal cathode base soldered directly to a large PCB copper pour or external heatsink using the recommended pad layout (0.470″ × 0.230″). Thermal vias under the cathode pad are strongly advised to maximize heat dissipation during repetitive surge events.
How does the e3 suffix in MAPLAD18KP18AE3 affect its assembly process?
The e3 suffix indicates RoHS-compliant matte-tin plating on MAPLAD18KP18AE3 terminals, fully compatible with standard Pb-free reflow profiles (up to 260°C for 10 seconds). It requires no special handling or baking prior to assembly, as its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - eliminating dry-pack requirements and simplifying SMT line integration.
MAPLAD18KP18AE3 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 617A
- 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
MAPLAD18KP18AE3 FAQ
1.How can I place an order for MAPLAD18KP18AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP18AE3 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 MAPLAD18KP18AE3 reliable?
The price and inventory of MAPLAD18KP18AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP18AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP18AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP18AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP18AE3?
MAPLAD18KP18AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP18AE3 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 MAPLAD18KP18AE3?
For technical support, including MAPLAD18KP18AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP18AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP18AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP18AE3 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 MAPLAD18KP18AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP18AE3?
All MAPLAD18KP18AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP18AE3, 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 MAPLAD18KP18AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP18AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP18AE3 Tags
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