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Microchip Technology MAPLAD18KP12CAE3
- Part No.:
- MAPLAD18KP12CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP12CAE3.pdf
- Description:
- TVS DIODE 12VWM 19.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,856
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Product details
Overview
MAPLAD18KP12CAE3 from Microsemi is a bidirectional 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, clamps to ≤19.9 V at 905 A, and features a 12 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (13.3–14.7 V). It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD18KP12CAE3 datasheet, MAPLAD18KP12CAE3 pinout, MAPLAD18KP12CAE3 application, or MAPLAD18KP12CAE3 equivalent, this device is selected for secondary lightning protection (IEC 61000-4-5), pin-injection immunity (DO-160F Waveform 4 Level 4), and high-reliability ESD/EFT suppression in avionics power rails and vehicle ECUs where thermal resistance (RθJC = 0.7 °C/W) and low-profile mounting are critical.
Technical Context
This TVS operates as a bidirectional avalanche diode with symmetrical clamping behavior across both polarities, enabling protection of AC-coupled or differential signal lines without polarity constraints. Its void-free UL94V-0 epoxy package and metal-base cathode construction provide low thermal resistance (0.7 °C/W junction-to-case) and direct heat path to PCB copper or heatsink.
It is characterized under standardized 10/1000 μs impulse waveforms per IEC 61000-4-5 and RTCA DO-160F, with validated performance at 42 Ω, 12 Ω, and 2 Ω source impedances - supporting Class 1–5 lightning protection tiers and Waveform 4/5A pin injection testing up to Level 5 (for VWM ≤130 V variants).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V maximum continuous reverse standoff voltage - sets upper limit for protected circuit's normal operating peak voltage |
| V(BR) @ I(BR) | 13.3–14.7 V breakdown range at test current - ensures reliable turn-on before downstream component damage |
| VC @ IPP | ≤19.9 V clamping voltage at 905 A peak pulse - defines worst-case voltage seen by protected IC during surge |
| PPP | 18,000 W peak pulse power at 10/1000 μs - enables single-device handling of severe lightning transients |
| RθJC | 0.7 °C/W junction-to-case thermal resistance - allows efficient heat transfer to PCB copper or external heatsink |
| ID @ VWM | ≤10 μA standby leakage - minimizes quiescent power loss in always-on systems like avionics sensors |
| αV(BR) | +11 mV/°C temperature coefficient - enables predictable voltage drift over -55°C to +150°C operating range |
Pinout & Package
The MAPLAD18KP12CAE3 uses a surface-mount plastic package with metal baseplate (cathode) and two solderable terminals on the top surface. The metal base serves as the common cathode terminal for bidirectional operation, while the top-side terminals are electrically connected to the anode nodes - forming a symmetrical dual-anode configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Baseplate (Bottom) | Cathode (Common) | Primary thermal path and electrical reference node; must be soldered to large copper pour or heatsink |
| Top Terminal 1 | Anode 1 | Connects to one side of protected differential line or AC input; forms first avalanche path |
| Top Terminal 2 | Anode 2 | Connects to opposite side of protected line; enables symmetrical bidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals or floating buses without polarity alignment - eliminates need for dual unidirectional devices |
| 18 kW pulse rating | Supports single-device compliance with RTCA DO-160 Section 22 multi-stroke lightning (up to 5 strokes) without derating |
| 0.7 °C/W RθJC | Reduces junction temperature rise by >70% vs. standard SMD TVS - extends lifetime under repetitive surge stress |
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications requiring zero defect reliability and extended temperature operation |
| RoHS-compliant (e3) | Meets global environmental regulations with matte-tin plating - compatible with lead-free reflow profiles up to 260°C |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in flight control computers against induced lightning surges per DO-160F Section 22. IC Role / Device Role / Timing Role: Primary secondary surge suppressor placed upstream of DC-DC converters and microcontrollers. Use Value: Clamps transients to ≤19.9 V within <5 ns, preventing latch-up or gate oxide rupture in 3.3 V/5 V logic downstream. | Use Scenario: Safeguarding 12 V battery-fed ECU power rails from load dump and alternator switching spikes. IC Role / Device Role / Timing Role: High-energy crowbar device absorbing >100 J pulses without failure across temperature extremes. Use Value: Withstands 1500 A forward surge (IFSM) and maintains <10 μA leakage at 12 V - avoids false resets during cold cranking. |
| Industrial Motor Drive I/O | Railway Signaling Interface |
Use Scenario: Shielding encoder feedback lines and analog sensor inputs in variable-frequency drives exposed to EFT and ESD. IC Role / Device Role / Timing Role: Bidirectional transient clamp on differential RS-422/485 or resolver interfaces. Use Value: Symmetrical clamping ensures equal protection for both signal polarities - preserves signal integrity during 4 kV EFT bursts. | Use Scenario: Securing 72 V DC signaling lines in train control systems against coupling from nearby traction currents. IC Role / Device Role / Timing Role: Secondary lightning protector compliant with EN 50121-4 for rolling stock EMC. Use Value: Validated for IEC 61000-4-5 Class 4 at 42 Ω source impedance - guarantees survivability of 4 kV surges on long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | 600 W PPP rating, 3.5 mm × 3.5 mm SMB package, RθJC ≈ 25 °C/W | Rated only for IEC 61000-4-5 Class 2; insufficient for DO-160F Level 4 lightning | Select when cost-sensitive, low-energy industrial I/O protection is sufficient and PCB space is constrained |
| SMCJ12CA | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJC ≈ 12 °C/W | Meets DO-160F Waveform 4 Level 3 but not Level 4; limited to single-stroke lightning | Choose for automotive body electronics where 1.5 kW surge capacity suffices and thermal margin is moderate |
Compared with SMBJ12CA and SMCJ12CA, the MAPLAD18KP12CAE3 provides 30× and 12× higher pulse power respectively, enabling certified multi-stroke lightning resilience and lower thermal impedance - essential for mission-critical avionics and high-end automotive power systems where single-point failure is unacceptable.
Availability
MAPLAD18KP12CAE3 is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU protection, and industrial motor drive I/O requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.
Supply support for MAPLAD18KP12CAE3 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 MAPLAD18KP12CAE3 belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning compliance and thermal robustness in harsh-environment electronics.
FAQ
What is the clamping voltage of MAPLAD18KP12CAE3 at its rated peak pulse current?
The MAPLAD18KP12CAE3 has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPP) of 905 A under 10/1000 μs waveform conditions. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The low clamping ratio (VC/VWM ≈ 1.66) reflects optimized avalanche dynamics for fast, controlled energy diversion.
Is MAPLAD18KP12CAE3 qualified for automotive applications?
Yes, MAPLAD18KP12CAE3 is AEC-Q101 qualified, confirming its suitability for automotive powertrain and chassis applications. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and surge endurance validation per AEC standards. Its -55°C to +150°C operating range and 1500 A forward surge rating (IFSM) make it appropriate for engine bay and transmission control modules where thermal and electrical extremes occur.
How does the metal baseplate of MAPLAD18KP12CAE3 function electrically and thermally?
The metal baseplate of MAPLAD18KP12CAE3 serves as the common cathode terminal for bidirectional operation and provides the primary thermal conduction path from the silicon die to the PCB. Electrically, it connects internally to both anode terminals through symmetrical avalanche junctions. Thermally, its 0.7 °C/W junction-to-case resistance requires soldering to ≥10 cm² of 2 oz copper for optimal heat dissipation - critical for sustaining repetitive surge duty cycles without thermal runaway.
Does MAPLAD18KP12CAE3 meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP12CAE3 is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing. It achieves Level 4 protection for Waveform 4 (6.4/69 μs) and supports Level 5 for VWM ≤130 V variants. Its 18 kW pulse rating, low clamping voltage, and thermal design enable five consecutive 10/1000 μs strokes at full amplitude - satisfying the most stringent aircraft equipment qualification requirements.
What is the meaning of the "CA" and "E3" suffixes in MAPLAD18KP12CAE3?
The "CA" suffix denotes bidirectional polarity, confirming symmetrical clamping behavior for AC or differential signal protection. The "E3" suffix indicates RoHS-compliant matte-tin plating per JEDEC J-STD-020B, with moisture sensitivity level (MSL) 1 - meaning no dry-pack baking is required prior to reflow. Together, they specify a lead-free, bidirectional, high-reliability TVS optimized for automated assembly and harsh-environment deployment.
MAPLAD18KP12CAE3 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 905A
- 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
MAPLAD18KP12CAE3 FAQ
1.How can I place an order for MAPLAD18KP12CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP12CAE3 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 MAPLAD18KP12CAE3 reliable?
The price and inventory of MAPLAD18KP12CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP12CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP12CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP12CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP12CAE3?
MAPLAD18KP12CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP12CAE3 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 MAPLAD18KP12CAE3?
For technical support, including MAPLAD18KP12CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP12CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP12CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP12CAE3 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 MAPLAD18KP12CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP12CAE3?
All MAPLAD18KP12CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP12CAE3, 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 MAPLAD18KP12CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP12CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP12CAE3 Tags
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Diodes Incorporated
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