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Microchip Technology MAPLAD18KP150A
- Part No.:
- MAPLAD18KP150A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP150A.pdf
- Description:
- TVS DIODE 150VWM 243VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
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Product details
Overview
MAPLAD18KP150A 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 ≤243 V under 243 A peak impulse current, and features a 150 V reverse standoff voltage (VWM) with 167–185 V breakdown range (V(BR)). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for lightning protection in aircraft avionics.
For engineers reviewing the MAPLAD18KP150A datasheet, MAPLAD18KP150A pinout, MAPLAD18KP150A application, or MAPLAD18KP150A equivalent, key selection criteria include its 150 V working voltage rating, 243 A peak pulse current capability, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and qualification for secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance (Class 1–5).
Technical Context
The MAPLAD18KP150A employs an avalanche diode structure optimized for fast response (<100 ps) and high-energy absorption in unidirectional configuration. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under repetitive transients at ≤0.05% duty factor when mounted on FR4 with recommended pad layout.
It is rated for junction temperatures from –55 °C to +150 °C and exhibits a temperature coefficient of breakdown voltage (αV(BR)) of 183 mV/°C. Standby leakage current is limited to 10 μA at 150 V VWM, ensuring minimal system loading during normal operation.
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) | 150 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (V(BR)) | 167–185 V @ I(BR) - defines minimum clamping threshold under specified test current |
| Max Clamping Voltage (VC) | 243 V @ 243 A IPP - limits protected circuit voltage during worst-case surge event |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink for high-reliability thermal management |
| Standby Leakage Current (ID) | 10 μA @ 150 V - negligible power loss and signal interference in standby mode |
| Clamping Response Time | <100 ps - ensures protection before sensitive downstream components experience overvoltage |
Pinout & Package
MAPLAD18KP150A uses a surface-mount PLAD package with two terminals: anode and cathode. The cathode is the metal base (bottom side), enabling direct thermal path to PCB copper or heatsink. Package dimensions are 12.32 × 10.54 × 5.08 mm (L × W × H), with tin-lead or RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal (for unidirectional operation) | Connected to protected line; conducts only during reverse-biased surge events |
| Cathode | Ground reference / return path | Mounted to metal base for thermal conduction and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Aerospace-grade surge rating | Qualified to RTCA DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4 up to 36 V variants); supports full aircraft lightning certification paths |
| High-reliability construction | Wafer and assembly lot traceability; 3σ screening on standby current; surge-tested per production lot |
| Thermally optimized package | Void-free UL94V-0 epoxy body with metal base; RθJC = 0.7 °C/W enables >71 W steady-state dissipation at TC = 100 °C |
| IEC 61000-4-5 compliance | Secondary lightning protection across Class 1–5 with 42 Ω source impedance - validated for 150 V VWM variant |
| ESD & EFT immunity | Meets IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) - protects against board-level electrostatic and burst transients |
Applications
| Aircraft Avionics Power Input | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC power bus in flight control computers subjected to DO-160F Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed at main power entry point to clamp surges before DC/DC converters. Use Value: Withstands 18 kW pulses and maintains <243 V clamping, preventing latch-up or damage to downstream ASICs and FPGAs. |
Use Scenario: 12 V/24 V battery-fed engine control unit exposed to ISO 7637-2 Load Dump pulses up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy directly to chassis ground during alternator field decay events. Use Value: 150 V VWM matches nominal 28 V system with margin; 243 A IPP handles 120 V/30 Ω load dump waveforms without failure. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: 400 V DC link in variable-frequency drives subject to IGBT switching transients and induced RFI. IC Role / Device Role / Timing Role: Secondary protection stage after bulk capacitors, absorbing high-dI/dt spikes from inductive loads. Use Value: Fast <100 ps response captures nanosecond-scale switching edges; low leakage avoids capacitor discharge during idle periods. |
Use Scenario: 110 V DC signaling interface in trackside equipment exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Line-to-ground TVS on power input to protect relay drivers and optocouplers from common-mode surges. Use Value: Validated for IEC 61000-4-5 Class 4 (42 Ω source) at 150 V rating - ensures interoperability with EN 50121-4 rail EMC requirements. |
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 SMAJ150A | Lower PPP (400 W), smaller SMA package, RθJA = 50 °C/W, no AEC-Q101 or DO-160 qualification | Suitable for consumer/industrial boards with lower surge exposure; not certified for aviation or automotive safety-critical use | Select SMAJ150A only for cost-sensitive non-safety applications where 18 kW rating is unnecessary |
| Vishay V150MLA18 | Same 150 V VWM and 18 kW rating but multilayer varistor (MLV) technology; slower response (~ns vs. ps), higher clamping ratio (Vc/Vwm ≈ 2.5 vs. 1.62) | Better for high-energy, low-frequency surges (e.g., AC mains); less effective against fast-rising lightning edges | Prefer MAPLAD18KP150A over V150MLA18 when protecting high-speed digital interfaces or DO-160F-compliant avionics |
Compared with SMAJ150A and V150MLA18, MAPLAD18KP150A uniquely combines aerospace qualification, picosecond response, and 18 kW power handling in a thermally robust surface-mount package-making it irreplaceable for certified lightning protection in flight-critical systems.
Availability
MAPLAD18KP150A is available at Aetrix Electronics and suitable for aircraft avionics, automotive power modules, and industrial motor drive designs requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical deployments.
Supply support for MAPLAD18KP150A 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, and timing solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP150A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning protection and automotive load dump compliance in mission-critical power systems.
FAQ
What is the clamping voltage of MAPLAD18KP150A at its rated peak pulse current?
The MAPLAD18KP150A has a maximum clamping voltage (VC) of 243 V when subjected to its peak pulse current (IPP) of 243 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures protected circuits remain below critical overvoltage thresholds during surge events.
Is MAPLAD18KP150A qualified for automotive applications?
Yes, MAPLAD18KP150A is tested and qualified to AEC-Q101 for stress testing of discrete semiconductors. It is explicitly rated for automotive load dump protection per ISO 7637-2 and supports secondary lightning protection per IEC 61000-4-5 - making it suitable for engine control units and battery management systems.
Does MAPLAD18KP150A require a heatsink for reliable operation?
While MAPLAD18KP150A can dissipate up to 71 W at TC = 100 °C, its 0.7 °C/W junction-to-case thermal resistance requires a heatsink or large copper pour for sustained high-power surge duty. For single-event lightning protection, PCB copper alone may suffice; for repetitive surges, active or passive heatsinking is recommended to maintain TJ ≤ 150 °C.
What is the polarity marking convention for MAPLAD18KP150A?
The MAPLAD18KP150A is unidirectional, with the cathode located on the metal base (bottom surface) of the package. The top surface is marked with the full part number, and polarity must be observed during placement: cathode connects to system ground or low-impedance return path to ensure proper surge shunting.
Can MAPLAD18KP150A be used in bidirectional configurations?
No - MAPLAD18KP150A is strictly unidirectional. Bidirectional variants carry the "CA" suffix (e.g., MAPLAD18KP150CA). Using MAPLAD18KP150A in AC or bipolar signal paths will result in forward conduction and potential failure; always select the CA version for bidirectional surge protection.
MAPLAD18KP150A 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):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 75A
- 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
MAPLAD18KP150A FAQ
1.How can I place an order for MAPLAD18KP150A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP150A 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 MAPLAD18KP150A reliable?
The price and inventory of MAPLAD18KP150A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP150A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP150A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP150A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP150A?
MAPLAD18KP150A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP150A 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 MAPLAD18KP150A?
For technical support, including MAPLAD18KP150A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP150A requirements.
6.How does Aetrix verify that MAPLAD18KP150A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP150A 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 MAPLAD18KP150A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP150A?
All MAPLAD18KP150A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP150A, 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 MAPLAD18KP150A part is unused and in its original packaging.
Return procedure for MAPLAD18KP150A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP150A Tags
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