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Microchip Technology MAPLAD18KP30A
- Part No.:
- MAPLAD18KP30A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,189
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Product details
Overview
MAPLAD18KP30A from Microsemi is a 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, features a 30 V reverse standoff voltage (VWM), clamps to ≤48.4 V at 372 A peak impulse current (IPP), and operates across –55 °C to +150 °C junction temperature. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22.
For engineers reviewing the MAPLAD18KP30A datasheet, MAPLAD18KP30A pinout, MAPLAD18KP30A application, or MAPLAD18KP30A equivalent, key selection criteria include its 30 V VWM rating, unidirectional polarity, low 0.7 °C/W junction-to-case thermal resistance, compliance with IEC 61000-4-5 (Class 1–5), and qualification to AEC-Q101.
Technical Context
The MAPLAD18KP30A is a unidirectional avalanche diode TVS optimized for multi-stroke lightning transients and load dump events. Its design centers on ultra-low thermal resistance (RθJC = 0.7 °C/W) and high pulse power handling (18 kW @ 10/1000 μs), enabling robust protection without external heatsinking under short-duration surges.
It meets stringent aerospace standards including RTCA DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4), and supports secondary lightning protection per IEC 61000-4-5 with 42 Ω, 12 Ω, and 2 Ω source impedances - validated for Class 1–5 (42 Ω), Class 1–4 (12 Ω), and Class 2–3 (2 Ω) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without failure in single or multi-stroke events |
| Reverse Standoff Voltage (VWM) | 30 V - maximum continuous DC or RMS operating voltage before clamping initiates |
| Clamping Voltage (VC) | ≤48.4 V @ IPP = 372 A - limits downstream circuit voltage during worst-case surge |
| Breakdown Voltage (V(BR)) | 33.3–36.8 V @ I(BR) - defines onset of avalanche conduction with tight 5% tolerance |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or heatsink, critical for repetitive surge duty |
| Steady-State Power Dissipation | 2.5 W @ TA = 25 °C - sets baseline thermal management requirement for ambient-biased operation |
| Operating Temperature Range | –55 °C to +150 °C - qualified for extended-range environments including engine bays and avionics bays |
Pinout & Package
The MAPLAD18KP30A uses a surface-mount PLAD package with metal base cathode configuration. The device has two terminals: anode (top-side marked side) and cathode (unmarked metal bottom surface). Mounting requires FR4 PCB with recommended pad layout per RF01215 Rev B for optimal thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal (marked side) | Connected to protected line; conducts during reverse-biased surge event when cathode is grounded |
| Cathode | Negative terminal / heat sink interface | Exposed metal base - must be soldered to large copper pour or heatsink for thermal path and ESD reference |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT construction | Height ≤ 0.025" (0.64 mm) - fits space-constrained avionics and automotive ECUs without height interference |
| AEC-Q101 qualification | Validated for automotive underhood applications - includes HTOL, TC, HAST, and surge testing per stress requirements |
| MIL-PRF-19500 upscreening option | Available with M, MA, MX, or MXL reliability levels - traceable wafer lots and 3σ screening on standby current (ID) |
| RTCA DO-160F compliance | Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 - certified for aircraft pin-injection immunity |
| IEC 61000-4-2/4-4/4-5 support | ESD (±30 kV air), EFT (±4 kV), and lightning surge (up to Class 5) - covers full EMC immunity stack |
Applications
| Aircraft Lightning Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting avionics power inputs against multi-stroke lightning induced by DO-160 Section 22 waveforms. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy directly at board-level entry point, diverting >95% of surge current to chassis ground. Use Value: Enables compliance with Level 4 pin injection (Waveform 4) and Level 4 waveform 5A - eliminating need for additional series impedance or filtering stages. | Use Scenario: Safeguarding 12 V/24 V vehicle electronics (e.g., ADAS ECUs, infotainment) during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Fast-response avalanche diode absorbing up to 18 kW surge energy within <100 ps, limiting bus voltage to ≤48.4 V. Use Value: Prevents latch-up or destruction of downstream MOSFETs and microcontrollers without derating or parallel devices. |
| Industrial DC Power Rail Protection | Railway Signaling Interface Protection |
Use Scenario: Securing 24–48 V DC power distribution in factory automation PLCs and motor drives exposed to switching transients. IC Role / Device Role / Timing Role: Primary surge arrestor placed upstream of DC-DC converters and isolated gate drivers to clamp fast-rising transients (<1 ns rise time). Use Value: Maintains system uptime by surviving repeated 10/1000 μs surges at 0.05% duty cycle - verified per Figure 1 derating curve. | Use Scenario: Protecting Ethernet and RS-485 interfaces in railway signaling cabinets subjected to induced lightning surges per EN 50121-4. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), providing low-clamping-voltage final-stage suppression. Use Value: Achieves Class 3/4 lightning immunity (IEC 61000-4-5, 42 Ω source) while preserving signal integrity due to sub-50 V VC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | 600 W PPP rating, 33.3 V V(BR), 48.4 V VC @ 10.3 A - 30× lower peak power than MAPLAD18KP30A | Only suitable for low-energy transients (e.g., ESD, minor switching noise); not rated for DO-160 or load dump | Select SMBJ30A only for cost-sensitive consumer-grade designs where surge energy remains below 100 J. |
| SMCJ30A | 1500 W PPP rating, 33.3 V V(BR), 48.4 V VC @ 61.5 A - 12× lower peak power than MAPLAD18KP30A | Validated for ISO 7637-2 Pulse 5a at limited durations; fails multi-stroke lightning testing per DO-160 | Choose SMCJ30A for automotive body electronics with moderate surge exposure - not for powertrain or avionics. |
Compared with SMBJ30A and SMCJ30A, the MAPLAD18KP30A provides 30× and 12× higher peak pulse power respectively, enabling reliable multi-stroke lightning protection and sustained load dump survival - making it the only viable option for aerospace and high-reliability industrial power rail protection.
Availability
MAPLAD18KP30A is available at Aetrix Electronics and suitable for aircraft lightning protection, automotive load dump suppression, and industrial DC power rail protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAPLAD18KP30A 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 MAPLAD18KP30A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load dump immunity in mission-critical platforms where failure is not an option.
FAQ
What is the clamping voltage of the MAPLAD18KP30A at its rated peak pulse current?
The MAPLAD18KP30A has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak impulse current (IPP) of 372 A under 10/1000 μs waveform conditions. This value is guaranteed per the Electrical Characteristics table in RF01215 Rev B and ensures downstream components remain within safe operating voltage limits during surge events.
Is the MAPLAD18KP30A RoHS compliant?
Yes, the MAPLAD18KP30A is RoHS compliant. Per the part nomenclature guide in RF01215 Rev B, the "e3" suffix denotes RoHS-compliant annealed matte-tin plating. Standard production units carry this finish unless otherwise specified, and meet IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack requirements.
Does the MAPLAD18KP30A require a heatsink for standard operation?
The MAPLAD18KP30A does not require an external heatsink for single-pulse or low-duty-cycle surge events due to its ultra-low junction-to-case thermal resistance of 0.7 °C/W and optimized metal-base package. However, for repetitive surges above 0.05% duty factor, thermal design must include a minimum 1-in² copper pour on the cathode side per the recommended pad layout in RF01215 Rev B.
Can the MAPLAD18KP30A be used in bidirectional configurations?
No, the MAPLAD18KP30A is unidirectional only. Its part number ends in "A", indicating unidirectional polarity. For bidirectional operation at 30 V standoff, the correct variant is MAPLAD18KP30CA - which shares identical PPP, VC, and thermal specs but supports AC-coupled or floating-line protection schemes.
What standards does the MAPLAD18KP30A meet for aircraft applications?
The MAPLAD18KP30A meets RTCA DO-160F Section 22 for lightning-induced transient susceptibility, including Waveform 4 (6.4/69 μs, Level 4) and Waveform 5A (40/120 μs, Level 4) pin injection tests. It also satisfies IEC 61000-4-5 Class 1–5 secondary lightning protection requirements when tested with 42 Ω source impedance.
MAPLAD18KP30A 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 372A
- 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
MAPLAD18KP30A FAQ
1.How can I place an order for MAPLAD18KP30A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP30A 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 MAPLAD18KP30A reliable?
The price and inventory of MAPLAD18KP30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP30A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP30A?
MAPLAD18KP30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP30A 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 MAPLAD18KP30A?
For technical support, including MAPLAD18KP30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP30A requirements.
6.How does Aetrix verify that MAPLAD18KP30A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP30A 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 MAPLAD18KP30A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP30A?
All MAPLAD18KP30A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP30A, 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 MAPLAD18KP30A part is unused and in its original packaging.
Return procedure for MAPLAD18KP30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP30A Tags
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