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Microchip Technology MAPLAD18KP120CAE3
- Part No.:
- MAPLAD18KP120CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP120CAE3.pdf
- Description:
- TVS DIODE 120VWM 193VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,982
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Product details
Overview
MAPLAD18KP120CAE3 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, features a 120 V reverse standoff voltage (VWM), clamps to ≤193 V at 100 A peak impulse current, and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MAPLAD18KP120CAE3 datasheet, MAPLAD18KP120CAE3 pinout, MAPLAD18KP120CAE3 application, or MAPLAD18KP120CAE3 equivalent, this device is selected for high-reliability DC bus protection in avionics power distribution units, engine control modules, and rail-mounted industrial converters where multi-stroke lightning immunity and low thermal resistance are critical.
Technical Context
This TVS diode uses a planar silicon avalanche structure optimized for fast response (<5 ns clamping time) and low dynamic impedance under high-current transients. Its metal-base package enables direct thermal coupling to heatsinks, achieving 0.7 °C/W junction-to-case thermal resistance - essential for sustaining repeated 18 kW surges without cumulative heating.
The bidirectional construction supports AC-coupled signal lines and floating DC rails, while its 120 V VWM aligns with 100 V nominal aircraft bus systems. Compliance with AEC-Q101 and MIL-PRF-19500 upscreening options confirms suitability for extended-life mission-critical deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated lightning surge energy without degradation |
| Reverse Standoff Voltage (VWM) | 120 V - maximum continuous operating voltage before clamping initiates |
| Clamping Voltage (VC) | 193 V @ 100 A IPP - limits downstream voltage stress during surge events |
| Breakdown Voltage (V(BR)) | 133–147 V @ I(BR) - ensures reliable avalanche conduction onset above VWM |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink for multi-pulse operation |
| Clamping Time | <5 ns - sub-nanosecond response prevents overshoot on fast-rising transients |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack required; supports standard SMT reflow |
Pinout & Package
MAPLAD18KP120CAE3 uses a surface-mount PLAD package with a metal base acting as the cathode terminal for both polarities. The device has two terminals: anode and cathode, with polarity marked by orientation on the PCB pad layout - cathode side corresponds to the metal base underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for unidirectional mode; symmetric terminal for bidirectional operation | Connected to protected line; forms low-impedance path to cathode during overvoltage |
| Cathode | Negative terminal (unidirectional); common reference terminal (bidirectional) | Mounted to metal heatsink or ground plane; serves as primary thermal and electrical return path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Enables protection of AC-coupled buses and floating DC rails without polarity constraints |
| 18 kW peak pulse rating | Meets RTCA DO-160 Section 22 multi-stroke lightning test requirements for aircraft |
| Metal-base thermal design | Reduces thermal resistance to 0.7 °C/W - critical for repetitive surge duty cycles |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling and HTRB |
| RoHS-compliant (e3) | Tin-plated terminals compatible with lead-free reflow profiles and IPC/JEDEC standards |
Applications
| Aerospace Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 100 V DC main bus in commercial aircraft avionics bays against lightning-induced transients per DO-160F Waveform 4 Level 4. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed at bus entry point to clamp surges before reaching DC-DC converters and flight computers. Use Value: Limits bus voltage to ≤193 V during 100 A surges, preventing latch-up or damage to downstream 120 V-rated components. | Use Scenario: Load dump protection on 12 V/24 V hybrid vehicle ECU power inputs exposed to alternator switching transients. IC Role / Device Role / Timing Role: Secondary surge protector after upstream fuses, absorbing residual energy not diverted by primary TVS or varistors. Use Value: Withstands 18 kW pulses without parametric shift, ensuring functional safety compliance over 15-year vehicle lifetime. |
| Railway Traction Converter | Industrial Motor Drive DC Link |
Use Scenario: Surge protection on 110 V DC auxiliary power supply in rolling stock subjected to electromagnetic interference from pantograph arcing. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across DC input terminals to suppress both positive and negative polarity transients. Use Value: Clamps within 5 ns to protect IGBT gate drivers and isolated feedback circuits from fast-rising RFI-induced spikes. | Use Scenario: Protection of 120 V DC link in servo motor drives operating in factory environments with frequent contactor switching. IC Role / Device Role / Timing Role: High-power TVS placed directly across DC bus capacitors to absorb commutation spikes and regenerative energy surges. Use Value: 0.7 °C/W thermal resistance allows mounting on shared heatsink with power stage, eliminating need for separate thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA | 600 W PPP rating, SMA package, RθJC = 35 °C/W | Restricted to single-stroke, low-duty-cycle protection; unsuitable for DO-160 multi-stroke testing | Select only for cost-sensitive, non-aerospace applications with <10 A IPP requirements |
| SMCJ120CA | 1500 W PPP rating, SMC package, RθJC = 12 °C/W | Lacks AEC-Q101 qualification and MIL-PRF-19500 upscreening options; limited to commercial-grade use | Acceptable for industrial controls where RTCA DO-160 compliance is not mandated |
Compared with SMBJ120CA and SMCJ120CA, MAPLAD18KP120CAE3 provides 30× and 12× higher peak pulse power respectively, coupled with certified aerospace reliability, metal-base thermal performance, and validated multi-stroke lightning endurance - making it the sole option for mission-critical 120 V bus protection requiring DO-160F or IEC 61000-4-5 Class 5 compliance.
Availability
MAPLAD18KP120CAE3 is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU protection, and industrial motor drive DC link applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAPLAD18KP120CAE3 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 analog, mixed-signal, and power semiconductors for aerospace, defense, and industrial markets.
The MAPLAD18KP120CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection in aviation and transportation systems where thermal robustness and certification compliance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP120CAE3 at its rated peak pulse current?
The MAPLAD18KP120CAE3 has a maximum clamping voltage (VC) of 193 V at 100 A peak impulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The clamping occurs within <5 ns, minimizing transient overshoot.
Is MAPLAD18KP120CAE3 compliant with RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP120CAE3 is explicitly validated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 protection when operated at 25 °C. Its 18 kW rating and bidirectional architecture meet the multi-stroke lightning standard for aircraft equipment. Derating applies above 25 °C per MicroNote 132.
Does MAPLAD18KP120CAE3 require a heatsink for reliable operation?
Yes - the MAPLAD18KP120CAE3 must be mounted on a thermally conductive surface (e.g., copper pour or metal heatsink) via its metal base to achieve the specified 0.7 °C/W junction-to-case thermal resistance. Without proper thermal coupling, junction temperature rise exceeds safe limits during repetitive surges, risking parametric drift or failure.
What does the "CA" suffix indicate in MAPLAD18KP120CAE3?
The "CA" suffix in MAPLAD18KP120CAE3 denotes bidirectional construction, meaning the device provides symmetrical transient suppression for both positive and negative polarity voltage excursions. This is distinct from "A"-suffixed unidirectional variants, which protect only one polarity and require correct orientation on the PCB.
How is MAPLAD18KP120CAE3 marked and packaged for automated assembly?
MAPLAD18KP120CAE3 is marked on the body with its full part number and RoHS-compliant "e3" designation. It is supplied in EIA-481-B compliant tape-and-reel format (add "TR" suffix for reel ordering), supporting standard pick-and-place placement. The package weighs approximately 1 gram and requires no dry pack due to IPC/JEDEC Level 1 moisture sensitivity.
MAPLAD18KP120CAE3 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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 94A
- 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
MAPLAD18KP120CAE3 FAQ
1.How can I place an order for MAPLAD18KP120CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP120CAE3 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 MAPLAD18KP120CAE3 reliable?
The price and inventory of MAPLAD18KP120CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP120CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP120CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP120CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP120CAE3?
MAPLAD18KP120CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP120CAE3 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 MAPLAD18KP120CAE3?
For technical support, including MAPLAD18KP120CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP120CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP120CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP120CAE3 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 MAPLAD18KP120CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP120CAE3?
All MAPLAD18KP120CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP120CAE3, 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 MAPLAD18KP120CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP120CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP120CAE3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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DESD5V0U1BA-7
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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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