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Microchip Technology MAPLAD18KP26A
- Part No.:
- MAPLAD18KP26A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,288
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Product details
Overview
MAPLAD18KP26A 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 transients to ≤42.1 V at 428 A, and features a 26 V reverse standoff voltage (VWM) with 28.9–31.9 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection.
For engineers reviewing the MAPLAD18KP26A datasheet, MAPLAD18KP26A pinout, MAPLAD18KP26A application, or MAPLAD18KP26A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (0.7 °C/W junction-to-case), fast response (<100 ps), and multi-stroke lightning compliance are critical - especially in avionics power distribution and automotive load-dump circuits.
Technical Context
The MAPLAD18KP26A employs an avalanche diode structure optimized for high-power transient suppression with minimal cumulative heating. Its metal-base package enables direct thermal coupling to heatsinks, achieving RθJC = 0.7 °C/W and supporting steady-state dissipation up to 71 W at TC = 100°C.
It operates under strict reliability protocols including 3σ lot norm screening on standby current (ID), full surge testing per AEC-Q101, and optional MIL-PRF-19500 upscreening. The cathode is defined on the metal base (bottom side), requiring correct PCB pad layout per RF01215 Rev B for thermal and electrical performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 26 V - sets maximum continuous operating voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 28.9–31.9 V @ I(BR) - defines guaranteed avalanche onset range for design margining |
| Max Clamping Voltage (VC) | 42.1 V @ 428 A - limits protected circuit voltage during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink or copper plane |
| Standby Current (ID) | ≤10 μA @ 26 V - ensures negligible leakage in standby DC systems |
| Response Time | <100 ps - clamps ESD and fast transients before downstream ICs are damaged |
Pinout & Package
MAPLAD18KP26A uses a surface-mount, metal-base PLAD package (0.470″ × 0.230″ × 0.100″) with cathode on the metal base (bottom side) and anode on the top-side metallized terminal. Thermal performance relies on proper mounting to a thermally conductive pad per RF01215 Rev B recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary thermal path and high-current return node; must be soldered to large copper area or heatsink |
| Top Metallized Pad | Anode | Input connection point for transient energy; routed to protected line (e.g., 24 V DC bus) |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT construction | Enables integration into space-constrained avionics modules without height clearance issues |
| AEC-Q101 qualification | Validates robustness for automotive under-hood environments including thermal cycling and humidity exposure |
| RTCA DO-160F Waveform 4 Level 4 compliance | Guarantees survivability against 6.4/69 μs pin-injection transients at 25°C in aircraft systems |
| IEC 61000-4-5 Class 1–5 support (42 Ω source) | Meets secondary lightning immunity requirements across all severity levels for industrial and transport electronics |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life restrictions, simplifying SMT assembly logistics |
Applications
| Aerospace Power Distribution | Automotive Load-Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses in commercial aircraft against lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient shunt element placed at bus entry point to clamp multi-stroke events to safe levels. Use Value: Enables compliance with RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 5 using a single surface-mount component with no derating required at 25°C. | Use Scenario: Safeguarding engine control units (ECUs) and body control modules (BCMs) during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-energy TVS connected across battery feed lines to divert >100 V transients within nanoseconds. Use Value: Absorbs up to 18 kW surge energy while limiting clamped voltage to 42.1 V - below typical 45 V IC damage thresholds - without thermal runaway. |
| Industrial DC Motor Drives | Railway Signaling Interfaces |
Use Scenario: Suppressing inductive kickback from brushed DC motors in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional-capable variant family member used as unidirectional clamp on motor supply rail. Use Value: Withstands repetitive 10/1000 μs surges at 0.05% duty cycle while maintaining VWM stability - verified by 3σ ID screening per lot. | Use Scenario: Hardening 24 V signaling lines in trackside equipment against induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Secondary protection device installed upstream of isolation barriers and interface ICs. Use Value: Provides IEC 61000-4-5 Class 3 immunity with 42 Ω source impedance - validated for multi-event endurance in harsh electromagnetic environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | 600 W PPP rating, SMA package, RθJA = 40 °C/W, no metal-base thermal path | Limited to low-energy consumer-grade surges; not qualified for DO-160 or AEC-Q101 | Select when cost and board space are prioritized over aerospace/automotive certification and multi-kW surge handling. |
| SMCJ26A | 1500 W PPP, SMC package, RθJC ≈ 2.5 °C/W, no upscreening options | Suitable for industrial IEC 61000-4-5 Class 3 only; lacks RTCA DO-160F validation | Choose for non-safety-critical 24 V systems needing higher energy rating than SMAJ but lower cost and qualification burden than MAPLAD18KP26A. |
Compared with SMAJ26A and SMCJ26A, MAPLAD18KP26A delivers 30× and 12× higher peak pulse power respectively, supports certified multi-stroke lightning immunity, and provides direct thermal conduction via metal base - making it the only option qualified for flight-critical 28 V bus protection where sustained surge energy and thermal management are non-negotiable.
Availability
MAPLAD18KP26A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load-dump protection, and industrial DC motor drive applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAPLAD18KP26A 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 MAPLAD18KP26A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where thermal performance, multi-event endurance, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP26A at its rated peak pulse current?
The MAPLAD18KP26A has a maximum clamping voltage (VC) of 42.1 V at its peak pulse current (IPP) of 428 A under 10/1000 μs waveform conditions. This value is measured per standard test methods in RF01215 Rev B and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MAPLAD18KP26A maintains this clamping performance across its qualified temperature range and after multiple surge strikes.
Is MAPLAD18KP26A qualified for automotive applications?
Yes, MAPLAD18KP26A is fully qualified to AEC-Q101 for stress testing including temperature cycling, humidity bias, and mechanical shock. It is explicitly rated for automotive load-dump protection per ISO 7637-2 Pulse 5a and supports under-hood ambient temperatures up to +125°C with appropriate derating. The MAPLAD18KP26A also undergoes 3σ lot norm screening on standby current (ID), ensuring consistent parametric yield across production lots.
Does MAPLAD18KP26A require special PCB layout considerations?
Yes, MAPLAD18KP26A requires adherence to the recommended pad layout in RF01215 Rev B to achieve specified thermal and electrical performance. Its metal base serves as both cathode and primary thermal path, so the bottom-side copper area must be generously sized and thermally connected to internal planes or external heatsinks. Trace inductance must be minimized - short, wide traces to the protected line and ground - to preserve sub-100 ps response time. The MAPLAD18KP26A cannot meet its 18 kW rating without proper thermal mounting.
Can MAPLAD18KP26A be used in bidirectional configurations?
No, MAPLAD18KP26A is a unidirectional device. Its polarity is fixed: cathode on the metal base, anode on the top metallized pad. For bidirectional protection at 26 V standoff, the correct variant is MAPLAD18KP26CA, which uses symmetrical avalanche structure and dual-polarity marking. Substituting MAPLAD18KP26A in AC or reversible DC applications risks catastrophic failure during reverse-biased transients. Always verify polarity suffix (A vs CA) before placement.
What certifications does MAPLAD18KP26A meet for aviation use?
MAPLAD18KP26A meets RTCA DO-160F Section 22 lightning-induced transient requirements, specifically Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 up to 36 V variants. It also satisfies IEC 61000-4-5 Class 1–5 secondary lightning protection with 42 Ω source impedance. These certifications are documented in Microsemi's RF01215 Rev B and validated through third-party lab testing - confirming the MAPLAD18KP26A's suitability for certified aircraft power system designs.
MAPLAD18KP26A 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 428A
- 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
MAPLAD18KP26A FAQ
1.How can I place an order for MAPLAD18KP26A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP26A 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 MAPLAD18KP26A reliable?
The price and inventory of MAPLAD18KP26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP26A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP26A?
MAPLAD18KP26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP26A 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 MAPLAD18KP26A?
For technical support, including MAPLAD18KP26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP26A requirements.
6.How does Aetrix verify that MAPLAD18KP26A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP26A 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 MAPLAD18KP26A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP26A?
All MAPLAD18KP26A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP26A, 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 MAPLAD18KP26A part is unused and in its original packaging.
Return procedure for MAPLAD18KP26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP26A Tags
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