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Microchip Technology MAPLAD18KP11A
- Part No.:
- MAPLAD18KP11A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP11A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,636
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Product details
Overview
MAPLAD18KP11A 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, clamps at ≤18.2 V under 989 A peak current, and features a 11 V reverse standoff voltage (VWM) with 12.2–13.5 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 for pin injection protection.
For engineers reviewing the MAPLAD18KP11A datasheet, MAPLAD18KP11A pinout, MAPLAD18KP11A application, or MAPLAD18KP11A equivalent, key selection criteria include its 11 V working voltage, 18.2 V max clamping at 989 A, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and qualification for lightning-level multi-stroke transients per DO-160 Section 22.
Technical Context
The MAPLAD18KP11A employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and high cumulative energy handling. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained surge duty cycles ≤0.05% per IEC 61000-4-5 testing protocols.
It operates across –55°C to +150°C junction temperature, with 9.0 mV/°C temperature coefficient of breakdown voltage and 10 μA max standby current at 11 V. The device is rated for secondary lightning protection per IEC 61000-4-5 with 42 Ω, 12 Ω, and 2 Ω source impedances - covering Class 1–5 depending on impedance configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous operating voltage before clamping begins; matches 12 V nominal rail systems with margin. |
| V(BR) min/max | 12.2–13.5 V - Confirmed avalanche onset range at 1 mA; ensures reliable triggering above system transients. |
| VC @ IPP | ≤18.2 V @ 989 A - Clamping voltage under full 10/1000 μs surge; limits downstream IC stress during load dump events. |
| PPP | 18,000 W - Peak pulse power rating defines maximum single-event energy absorption capability. |
| RθJC | 0.7 °C/W - Junction-to-case thermal resistance enables efficient heat transfer to PCB copper or external heatsink. |
| ID @ VWM | 10 μA - Low leakage at rated standoff voltage preserves battery life in always-on vehicle modules. |
| Clamping Time | <5 ns - Sub-nanosecond response ensures protection of fast-edge digital interfaces and microcontrollers. |
Pinout & Package
MAPLAD18KP11A uses a surface-mount PLAD package with two terminals: anode and cathode. The cathode is the metal base (bottom side), enabling direct thermal conduction to the PCB ground plane or heatsink. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), with recommended FR4 pad layout per RF01215 Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal | Connected to protected line (e.g., 12 V supply rail); current flows into device during positive transients. |
| Cathode | Ground reference / heat path | Electrically tied to system ground and thermally coupled to PCB copper or heatsink via metal base. |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating | Enables single-device protection against automotive load dump (ISO 7637-2 Pulse 5a) and DO-160 lightning waveforms without parallel staging. |
| 0.7 °C/W RθJC | Allows >70 W steady-state dissipation when mounted on 100°C heatsink - supports hybrid surge + bias operation in engine control units. |
| AEC-Q101 qualified | Validated for automotive under-hood environments including temperature cycling, mechanical shock, and humidity exposure. |
| DO-160F Waveform 4 Level 4 compliance | Guarantees immunity to 6.4/69 μs pin-injection transients up to 100 V at 25°C - critical for avionics data bus protection. |
| e3 RoHS plating | Matte-tin terminations ensure solderability per MIL-STD-750 Method 2026 and eliminate lead-related reliability concerns in high-reliability assemblies. |
Applications
| Automotive Engine Control Unit (ECU) | Aerospace Flight Control System |
|---|---|
Use Scenario: Protecting 12 V power inputs in diesel ECU modules exposed to ISO 7637-2 Pulse 5a load dump transients up to 120 V. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC/DC converters and MCU power rails. Use Value: Limits voltage excursion to ≤18.2 V during 18 kW surges, preventing latch-up or permanent damage to 28 V-rated regulators and 5 V LDOs. | Use Scenario: Safeguarding ARINC 429 receiver inputs against induced transients from lightning coupling on airframe wiring harnesses. IC Role / Device Role / Timing Role: Secondary-level TVS on signal lines, coordinated with front-end filtering to meet DO-160 Section 22 multi-stroke requirements. Use Value: Responds in <5 ns to clamp induced spikes before they propagate into FPGA-based protocol decoders, preserving data integrity. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Interface |
Use Scenario: Suppressing switching transients generated by IGBT inverters on 24 V auxiliary DC bus feeding PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional TVS bridging bus to chassis ground, sized to absorb repetitive 10/1000 μs surges at ≤0.05% duty cycle. Use Value: Sustains 18,000 W peak power without degradation over 1000+ surge events due to wafer-level lot traceability and 3σ ID screening. | Use Scenario: Protecting 110 V DC signaling interface in European railway interlocking cabinets subjected to IEC 61000-4-5 surge tests with 42 Ω source impedance. IC Role / Device Role / Timing Role: Class 4-compliant secondary protector installed after primary gas discharge tube (GDT) stage. Use Value: Achieves 18.2 V clamping at 989 A while maintaining <10 μA leakage - avoids false tripping of sensitive relay drivers. |
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 SMAJ11A | 600 W PPP rating, 5.0 mm × 3.5 mm SMA package, RθJA = 40 °C/W (no metal base) | Rated only for IEC 61000-4-2/4-4; not qualified for DO-160 or AEC-Q101 | Select when cost-sensitive consumer-grade protection suffices and thermal performance is secondary. |
| Vishay V18MLA1103NH | 18 kW multilayer varistor (MLV), bidirectional, 12.5 mm × 10.5 mm footprint, no specified RθJC | Slower response (>20 ns), higher clamping (~22 V), no DO-160 waveform validation | Choose for space-constrained layouts where polarity-agnostic clamping is required and sub-5 ns response is not critical. |
Compared with SMAJ11A and V18MLA1103NH, MAPLAD18KP11A uniquely combines 18 kW power handling, <5 ns response, metal-base thermal path, and DO-160F Waveform 4 Level 4 certification - making it the only option qualified for high-reliability aerospace power rail protection where both speed and energy capacity are non-negotiable.
Availability
MAPLAD18KP11A is available at Aetrix Electronics and suitable for automotive engine control units, aerospace flight control systems, industrial motor drive DC buses, and railway signaling power interfaces requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP11A 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 MAPLAD18KP11A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load dump protection in safety-critical platforms where thermal robustness and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of the MAPLAD18KP11A under surge conditions?
The MAPLAD18KP11A has a maximum clamping voltage (VC) of 18.2 V at 989 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures downstream circuitry remains within safe operating voltage limits during high-energy transients such as automotive load dump or DO-160 lightning surges.
Is the MAPLAD18KP11A suitable for bidirectional signal line protection?
No, the MAPLAD18KP11A is unidirectional - its cathode is the metal base and must be connected to ground, with the anode tied to the protected line. For bidirectional protection, use MAPLAD18KP11CA, which features symmetrical breakdown in both directions and carries the "CA" suffix per Microsemi's nomenclature.
Does the MAPLAD18KP11A require derating at elevated ambient temperatures?
Yes, the MAPLAD18KP11A requires thermal derating above 25°C ambient. Its peak pulse power (PPP) decreases linearly per the derating curve in Figure 3 of RF01215 Rev B, reaching ~50% of 18,000 W at 100°C case temperature. Proper PCB copper area and optional heatsinking are essential to maintain performance in high-temperature environments like engine compartments.
What packaging options are available for the MAPLAD18KP11A?
The MAPLAD18KP11A is offered in bulk and tape-and-reel formats. Tape-and-reel packaging follows EIA-481-B standards and requires adding the "TR" suffix (e.g., MAPLAD18KP11ATR). Custom reel quantities and moisture-sensitive packaging per IPC/JEDEC J-STD-020B Level 1 (no dry pack required) are supported for high-volume production runs.
How is the MAPLAD18KP11A validated for aerospace applications?
The MAPLAD18KP11A is validated for aerospace use through RTCA DO-160F Section 22 lightning testing (multi-stroke), Waveform 4 Level 4 pin injection (6.4/69 μs), and full AEC-Q101 qualification. It also meets IEC 61000-4-5 secondary lightning protection requirements with 42 Ω, 12 Ω, and 2 Ω source impedances - all documented in Microsemi's RF01215 Rev B specification report.
MAPLAD18KP11A 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 989A
- 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
MAPLAD18KP11A FAQ
1.How can I place an order for MAPLAD18KP11A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP11A 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 MAPLAD18KP11A reliable?
The price and inventory of MAPLAD18KP11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP11A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP11A?
MAPLAD18KP11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP11A 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 MAPLAD18KP11A?
For technical support, including MAPLAD18KP11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP11A requirements.
6.How does Aetrix verify that MAPLAD18KP11A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP11A 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 MAPLAD18KP11A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP11A?
All MAPLAD18KP11A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP11A, 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 MAPLAD18KP11A part is unused and in its original packaging.
Return procedure for MAPLAD18KP11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP11A Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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