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Microchip Technology MAPLAD18KP36A
- Part No.:
- MAPLAD18KP36A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP36A.pdf
- Description:
- TVS DIODE 36VWM 58.1VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,006
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Product details
Overview
MAPLAD18KP36A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤58.1 V under 310 A peak impulse current, and features a 36 V reverse standoff voltage (VWM) with 40.0–44.2 V breakdown range. It meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MAPLAD18KP36A datasheet, MAPLAD18KP36A pinout, MAPLAD18KP36A application, or MAPLAD18KP36A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant matte-tin terminations, and MIL-PRF-19500 upscreening capability are critical design requirements.
Technical Context
The MAPLAD18KP36A employs an avalanche diode structure optimized for fast response (<100 ps rise time) and stable clamping under multi-stroke transients. Its thermally enhanced metal-base package enables direct heat sinking to PCB copper planes, supporting sustained operation at junction temperatures from –55 °C to +150 °C.
It is characterized per AEC-Q101 and tested per IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning) with 2 Ω, 12 Ω, and 42 Ω source impedances - enabling use in both primary and secondary protection stages of avionics power distribution units and vehicle battery management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation in single-event or low-duty-cycle (≤0.05%) applications |
| Reverse Standoff Voltage (VWM) | 36 V - maximum continuous DC or RMS operating voltage before conduction begins; matches 24 V nominal systems with 50% overhead |
| Breakdown Voltage (V(BR)) | 40.0–44.2 V @ I(BR) - defines minimum clamping threshold; ensures reliable turn-on before downstream component damage |
| Max Clamping Voltage (VC) | 58.1 V @ 310 A IPP - limits voltage seen by protected circuitry during worst-case surge; <1.6× VWM ratio confirms tight regulation |
| Standby Current (ID) | 10 μA @ 36 V - negligible leakage at rated standoff, preserving system efficiency and battery life in always-on applications |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables effective heat transfer from junction to case/mounting plane; supports >71 W steady-state dissipation at TC = 100 °C |
| Junction Temp Range | –55 °C to +150 °C - qualified for extended temperature operation in engine bays, avionics bays, and outdoor industrial enclosures |
Pinout & Package
MAPLAD18KP36A uses a surface-mount plastic package with metal base cathode termination. The device has two terminals: anode (top metallization) and cathode (exposed metal bottom surface). Mounting requires thermal pad layout per RF01215 Rev B (page 7) to maintain RθJA ≤ 50 °C/W on FR4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal | Connected to protected line (e.g., 24 V rail); conducts only during reverse-biased surge events |
| Cathode | Ground reference / heat sink interface | Exposed metal base; must be soldered to large copper pour for thermal management and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT construction | Height ≤ 0.025" (0.64 mm) - enables compact placement near connectors or power entry points without height clearance issues |
| RoHS-compliant matte-tin plating | Meets MIL-STD-750 Method 2026 solderability - ensures robust reflow joint integrity and long-term intermetallic stability |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges at 25 °C - certified for aircraft power distribution and flight control electronics |
| MIL-PRF-19500 upscreening option | Available with M, MA, MX, or MXL reliability levels - supports mission-critical programs requiring lot traceability and 3σ ID screening |
| Moisture Sensitivity Level 1 | No dry pack required per J-STD-020B - eliminates baking step and reduces assembly cost and risk of popcorning |
Applications
| Aerospace Power Distribution | Automotive Battery Management |
|---|---|
Use Scenario: Protection of 28 V DC bus inputs in avionics subsystems against lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping element placed at board-level power entry, absorbing multi-kW surges before they reach DC-DC converters or FPGAs. Use Value: Enables compliance with Level 4 pin injection (Waveform 4) and Class 5 lightning (IEC 61000-4-5, 42 Ω) without external heatsinking or derating. | Use Scenario: Load dump suppression on 12 V/24 V vehicle battery rails during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy directly to chassis ground via low-inductance cathode mounting. Use Value: Clamps to 58.1 V within 100 ps, limiting voltage overshoot below 60 V - protecting CAN transceivers, microcontrollers, and sensors rated to 65 V ABS MAX. |
| Industrial Motor Drive Inputs | Railway Signaling Power Supplies |
Use Scenario: Surge protection on AC/DC rectified DC bus lines exposed to switching transients from contactors or IGBTs. IC Role / Device Role / Timing Role: Secondary protection stage after MOV-based front-end filtering, handling residual fast-rising edges. Use Value: 310 A IPP rating and 0.7 °C/W RθJC allow repeated 18 kW surges with minimal thermal accumulation on standard 2 oz copper PCBs. | Use Scenario: Input protection for 72 V or 110 V DC signaling power supplies in trackside cabinets subject to induced lightning currents. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MAPLAD18KP36CA) used in floating or AC-coupled interfaces; unidirectional MAPLAD18KP36A deployed on grounded-rail sections. Use Value: Validated for IEC 61000-4-5 Class 2–4 with 2 Ω and 12 Ω source impedance - meets EN 50121-3-2 immunity requirements for rolling stock. |
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 SMAJ36A | 600 W PPP rating, 5.0 mm × 3.5 mm SMA package, RθJC ≈ 40 °C/W | Rated for consumer/industrial use only; not qualified to DO-160 or AEC-Q101 | Select when cost sensitivity outweighs aerospace/automotive qualification needs and surge energy is ≤600 W |
| Vishay V275LA20AP | 275 VAC varistor, 10 kA 8/20 μs rating, no DC standoff specification | AC-line focused; unsuitable for precise DC clamping or low-leakage 24 V systems | Select only for AC mains input stages where bidirectional clamping and high repetitive surge tolerance are prioritized over DC precision |
Compared with SMAJ36A and V275LA20AP, MAPLAD18KP36A provides 30× higher peak pulse power, certified aerospace-grade reliability, and a defined 36 V DC standoff - making it uniquely suited for safety-critical 24 V DC systems where single-event survivability and thermal margin are non-negotiable.
Availability
MAPLAD18KP36A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive battery management, and industrial motor drive applications requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP36A 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 ICs for aerospace, defense, and industrial markets.
The PLAD family - including MAPLAD18KP36A - was engineered specifically for high-energy transient suppression in safety-critical platforms where DO-160, AEC-Q101, and MIL-PRF-19500 compliance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP36A at its rated peak pulse current?
The MAPLAD18KP36A exhibits a maximum clamping voltage (VC) of 58.1 V at its rated peak pulse current (IPP) of 310 A under 10/1000 μs waveform conditions. This value is guaranteed per RF01215 Rev B, Table on page 4, and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is MAPLAD18KP36A suitable for automotive load dump protection per ISO 7637-2?
Yes, MAPLAD18KP36A is validated for automotive load dump protection, meeting AEC-Q101 stress testing requirements and delivering 18,000 W peak pulse power at 10/1000 μs. Its 36 V VWM and 58.1 V clamping align with 24 V system requirements, and its low RθJC (0.7 °C/W) supports thermal survival during repeated 12 V/24 V load dump events - though system-level validation per ISO 7637-2 Pulse 5a/b remains the responsibility of the end designer.
Does MAPLAD18KP36A require special PCB layout considerations?
Yes, MAPLAD18KP36A requires adherence to the pad layout specified in RF01215 Rev B (page 7) to achieve rated thermal performance. The cathode (metal base) must be soldered to a minimum 100 mm² copper pour with ≥4 thermal vias to internal ground planes. Failure to follow this layout increases RθJA beyond 50 °C/W and risks thermal runaway during multi-stroke surges - directly impacting reliability in DO-160 or IEC 61000-4-5 test environments.
Can MAPLAD18KP36A be used in bidirectional configurations?
No - MAPLAD18KP36A is unidirectional. For bidirectional operation, the designated variant is MAPLAD18KP36CA (with "CA" suffix), which provides symmetrical clamping for AC-coupled or floating signal lines. Using MAPLAD18KP36A in reverse-biased AC applications will result in forward conduction and permanent failure; the CA version is the only qualified bidirectional option in this 36 V standoff family.
What screening levels are available for MAPLAD18KP36A under MIL-PRF-19500?
MAPLAD18KP36A supports MIL-PRF-19500 upscreening to M, MA, MX, and MXL reliability levels, as documented in the Hirel Non-Hermetic Product Portfolio. These include lot traceability, 3σ screening on standby current (ID), and additional environmental stress testing - enabling use in military avionics, satellite power systems, and other programs requiring documented process control and failure rate modeling per MIL-HDBK-217F.
MAPLAD18KP36A 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 310A
- 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
MAPLAD18KP36A FAQ
1.How can I place an order for MAPLAD18KP36A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP36A 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 MAPLAD18KP36A reliable?
The price and inventory of MAPLAD18KP36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP36A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP36A?
MAPLAD18KP36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP36A 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 MAPLAD18KP36A?
For technical support, including MAPLAD18KP36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP36A requirements.
6.How does Aetrix verify that MAPLAD18KP36A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP36A 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 MAPLAD18KP36A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP36A?
All MAPLAD18KP36A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP36A, 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 MAPLAD18KP36A part is unused and in its original packaging.
Return procedure for MAPLAD18KP36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP36A Tags
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