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Microchip Technology MAPLAD18KP90A
- Part No.:
- MAPLAD18KP90A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP90A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,091
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Product details
Overview
MAPLAD18KP90A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤146 V under 1000 A peak impulse current, and features a 90 V reverse standoff voltage (VWM) with 100–111 V breakdown voltage (V(BR)). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4 in aircraft avionics.
For engineers reviewing the MAPLAD18KP90A datasheet, MAPLAD18KP90A pinout, MAPLAD18KP90A application, or MAPLAD18KP90A equivalent, this device serves as a high-reliability secondary lightning protector per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), supports ESD/EFT immunity per IEC 61000-4-2/4-4, and provides low thermal resistance (RθJC = 0.7 °C/W) for thermally demanding board-level surge management.
Technical Context
The MAPLAD18KP90A employs an avalanche diode structure optimized for fast response (<100 ps clamping latency) and high cumulative stroke endurance. Its metal-base package enables direct thermal coupling to heatsinks, supporting steady-state dissipation up to 71 W at TC = 100°C while maintaining junction temperature within −55°C to +150°C limits.
It operates as a shunt-mode protector: during overvoltage events exceeding V(BR), it avalanches into low-impedance conduction, diverting surge current away from downstream circuitry. Its bidirectional counterpart (MAPLAD18KP90CA) shares identical PPP and IPP ratings but supports AC-coupled or bipolar signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains multi-stroke lightning surges without degradation |
| Reverse Standoff Voltage (VWM) | 90 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (V(BR)) | 100–111 V @ I(BR) - precise avalanche threshold enabling predictable turn-on margin |
| Max Clamping Voltage (VC) | 146 V @ IPP = 1000 A - limits protected circuit voltage stress during worst-case transients |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink or copper pour |
| Standby Current (ID) | 10 μA @ VWM - negligible leakage ensures minimal standby power loss in battery-backed systems |
| Temperature Coefficient αV(BR) | 109 mV/°C - stable voltage drift across operating range supports design margining |
Pinout & Package
MAPLAD18KP90A uses a low-profile, void-free transfer-molded thermosetting epoxy package (UL94V-0 rated) with a metal base acting as the cathode terminal. The package measures 12.32 × 10.54 × 5.08 mm (L × W × H) and weighs ~1 g. Cathode polarity is marked on the metal bottom surface; anode is the top-side metallized pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side pad) | Positive input node for unidirectional surge path | Connected to protected line; conducts surge current toward cathode when Vline > V(BR) |
| Cathode (metal base) | Common return / ground reference | Serves as primary thermal interface and low-inductance current return path to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating with 1000 A capability | Enables single-device compliance with RTCA DO-160 Section 22 multi-stroke lightning testing |
| Metal-base thermal architecture | Reduces RθJC to 0.7 °C/W - allows direct mounting to heatsink or large copper area for sustained thermal management |
| AEC-Q101 qualification | Validates reliability for automotive load-dump and battery-transient environments (−40°C to +125°C operation) |
| RoHS-compliant (e3) matte-tin plating | Ensures solderability per MIL-STD-750 Method 2026 and compatibility with lead-free reflow profiles |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement per IPC/JEDEC J-STD-020B - simplifies handling and assembly logistics |
Applications
| Aircraft Avionics Power Input | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC power inputs of flight-critical sensors and communication modules against DO-160F Waveform 4 (6.4/69 μs) lightning-induced transients. IC Role / Device Role / Timing Role: Shunt-mode transient suppressor placed directly at connector entry point to clamp surges before reaching DC-DC converters and microcontrollers. Use Value: Guarantees Level 4 immunity with clamping <146 V, preventing latch-up or damage to 3.3 V/5 V logic rails downstream. | Use Scenario: Safeguarding 12 V battery-fed engine control units during ISO 7637-2 load-dump events (up to 120 V, 400 ms). IC Role / Device Role / Timing Role: Primary surge diverter mounted adjacent to power entry connector, absorbing >95% of 18 kW energy pulse. Use Value: Withstands 1500 A forward surge (IFSM) and maintains VWM ≥90 V - avoids false triggering during normal alternator regulation. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Secondary protection on 100 V DC bus lines feeding IGBT gate drivers in variable-frequency drives exposed to switching-induced transients. IC Role / Device Role / Timing Role: Fast-response TVS placed between bus and driver IC supply rail to suppress dV/dt spikes from IGBT commutation. Use Value: Sub-100 ps clamping latency prevents false triggering of gate drivers; 146 V VC limits stress on 120 V-rated capacitors. | Use Scenario: Protecting 72 V signaling interfaces in train control systems subjected to IEC 61000-4-5 Class 4 surges (42 Ω source, 4 kV test level). IC Role / Device Role / Timing Role: Line-to-ground shunt protector on trackside communication ports interfacing with centralized traffic management. Use Value: Certified for secondary lightning protection per IEC 61000-4-5 with 42 Ω impedance - ensures system-level compliance without additional series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90A (onsemi) | 600 W PPP rating, 100 V VC @ 32.4 A IPP - 30× lower peak power handling | Suitable only for low-energy ESD/EFT; not rated for DO-160 or load-dump | Select MAPLAD18KP90A when full lightning or automotive load-dump compliance is required. |
| SMCJ90A (Littelfuse) | 1500 W PPP, 143 V VC @ 80 A IPP - 12× lower surge capacity than MAPLAD18KP90A | Meets IEC 61000-4-5 Class 2/3 but fails Class 4/5 and DO-160F Level 4/5 | Choose MAPLAD18KP90A for aerospace-grade multi-stroke endurance and certified RTCA compliance. |
Compared with SMBJ90A and SMCJ90A, MAPLAD18KP90A delivers 30× and 12× higher peak pulse power respectively, enabling single-device compliance with RTCA DO-160F Level 4 and IEC 61000-4-5 Class 4/5 - critical for mission-critical avionics and heavy-duty automotive systems where cascaded protection adds cost and failure points.
Availability
MAPLAD18KP90A is available at Aetrix Electronics and suitable for aircraft avionics power conditioning, automotive ECU surge protection, and industrial motor drive DC bus safeguarding requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP90A 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The MAPLAD18KP90A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning protection and automotive load-dump immunity in safety-critical systems.
FAQ
What is the clamping voltage of MAPLAD18KP90A at its rated peak pulse current?
The MAPLAD18KP90A has a maximum clamping voltage (VC) of 146 V when subjected to its rated peak pulse current of 1000 A under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MAPLAD18KP90A achieves this performance while maintaining sub-100 ps response latency.
Is MAPLAD18KP90A qualified for automotive applications?
Yes, MAPLAD18KP90A is qualified to AEC-Q101 standards for discrete semiconductors, validating its robustness in automotive environments including temperature cycling, humidity, and mechanical shock. Its 90 V VWM and 1500 A forward surge rating make it suitable for 12 V and 24 V battery systems facing ISO 7637-2 load-dump transients. MAPLAD18KP90A also supports RoHS-compliant (e3) assembly processes used in modern automotive manufacturing.
Does MAPLAD18KP90A meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP90A is explicitly rated for RTCA DO-160F Section 22 lightning-induced transient testing. It meets Level 4 for Waveform 4 (6.4/69 μs) and Level 4 for Waveform 5A (40/120 μs) at 25°C ambient, as confirmed in the product nomenclature and application notes. MAPLAD18KP90A's 18 kW rating and metal-base thermal design enable reliable multi-stroke endurance required by aircraft certification protocols.
What is the thermal resistance and how should MAPLAD18KP90A be mounted for optimal heat dissipation?
MAPLAD18KP90A has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W, achieved via its metal-base construction. For optimal heat dissipation, mount the device with the metal base soldered directly to a large copper pour or external heatsink using the recommended pad layout (12.32 × 10.54 mm). Avoid thermal vias beneath the base; instead, use solid copper area ≥25 cm² for sustained 71 W dissipation at TC = 100°C. MAPLAD18KP90A's low RθJC eliminates need for supplemental thermal interface materials.
How does MAPLAD18KP90A differ from its bidirectional variant MAPLAD18KP90CA?
MAPLAD18KP90A is unidirectional (anode-cathode polarity), while MAPLAD18KP90CA is bidirectional (symmetrical breakdown). Both share identical 18 kW PPP, 146 V VC, and 90 V VWM ratings, but MAPLAD18KP90CA supports AC-coupled or differential signal lines where polarity reversal occurs. MAPLAD18KP90A is preferred for DC power rail protection due to lower leakage and tighter V(BR) tolerance (100–111 V vs. ±100–111 V), whereas MAPLAD18KP90CA suits telecom or data line applications requiring bipolar clamping.
MAPLAD18KP90A 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 1169A (1.169kA)
- 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
MAPLAD18KP90A FAQ
1.How can I place an order for MAPLAD18KP90A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP90A 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 MAPLAD18KP90A reliable?
The price and inventory of MAPLAD18KP90A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP90A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP90A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP90A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP90A?
MAPLAD18KP90A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP90A 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 MAPLAD18KP90A?
For technical support, including MAPLAD18KP90A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP90A requirements.
6.How does Aetrix verify that MAPLAD18KP90A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP90A 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 MAPLAD18KP90A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP90A?
All MAPLAD18KP90A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP90A, 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 MAPLAD18KP90A part is unused and in its original packaging.
Return procedure for MAPLAD18KP90A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP90A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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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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Diodes Incorporated
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