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Microchip Technology MAPLAD18KP15A
- Part No.:
- MAPLAD18KP15A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,736
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Product details
Overview
MAPLAD18KP15A 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 ≤24.4 V under 738 A peak impulse current, and features a 15 V reverse standoff voltage (VWM) with 16.7–18.5 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for aircraft avionics.
For engineers reviewing the MAPLAD18KP15A datasheet, MAPLAD18KP15A pinout, MAPLAD18KP15A application, or MAPLAD18KP15A equivalent, key selection criteria include its 0.7 °C/W junction-to-case thermal resistance, metal-base cathode polarity, IEC 61000-4-5 Class 1–5 secondary lightning compliance, and suitability for 28 V DC bus protection in flight control and engine management systems.
Technical Context
The MAPLAD18KP15A employs an avalanche diode structure optimized for low clamping ratio (VC/V(BR) ≈ 1.46) and sub-100 ps response time, enabling effective suppression of fast-rising transients such as lightning-induced surges and load dump spikes. Its thermally enhanced metal-base package minimizes junction-to-heat-sink thermal resistance, supporting sustained multi-stroke operation per RTCA DO-160 Section 22.
It operates across –55°C to +150°C junction temperature range and is rated for 3σ lot norm screening on standby current (ID ≤ 10 μA @ 15 V). The device is RoHS-compliant (e3 marking), moisture-sensitive level 1, and supports tape-and-reel packaging (TR suffix option).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - enables single-device protection against severe lightning strikes and automotive load dump events |
| Reverse Standoff Voltage (VWM) | 15 V - matches nominal 28 V DC system peak operating voltage with safety margin |
| Clamping Voltage (VC) | 24.4 V @ 738 A - limits downstream voltage stress below 28 V rail tolerance during surge |
| Breakdown Voltage (V(BR)) | 16.7–18.5 V @ I(BR) - ensures reliable avalanche conduction onset above normal operating voltage |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - allows efficient heat transfer to PCB copper pour or heatsink, critical for repeated surge duty |
| Standby Current (ID) | ≤10 μA @ 15 V - negligible leakage in standby, preserving battery life in always-on avionics |
| Response Time | <100 ps - captures nanosecond-scale transients before sensitive circuitry reacts |
Pinout & Package
MAPLAD18KP15A uses a surface-mount PLAD package with metal base acting as the cathode terminal. The package features void-free UL94V-0 epoxy body, matte-tin plating, and a 12.32 × 10.54 mm footprint (A1 × A2) with 5.08 mm terminal width (D). Polarity is marked by cathode on the metal underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary current return path and thermal interface - must be soldered to large copper pour or heatsink for thermal performance |
| Top Surface Terminal | Anode | Signal/power input node - connects to protected line (e.g., 28 V bus); minimal trace inductance required |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer lot traceability | Full fabrication and assembly lot tracking per MIL-PRF-19500 upscreening options available |
| RTCA DO-160F Waveform 4 compliance | Level 4 protection (6.4/69 μs) - validated for aircraft pin-injection immunity without derating at 25°C |
| IEC 61000-4-5 secondary lightning robustness | Class 1–5 compliant with 42 Ω source impedance - covers full spectrum of induced surge severity in airframe wiring |
| Low-profile SMT construction | Height ≤ 0.64 mm (H max) - enables placement in space-constrained avionics modules without mechanical interference |
| ESD/EFT immunity | IEC 61000-4-2 (±15 kV air/±8 kV contact) and IEC 61000-4-4 (4 kV) - protects against handling and switching noise |
Applications
| Avionics Power Bus Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC distribution lines in flight management computers against lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient clamp on main power rail; absorbs multi-stroke energy without degradation. Use Value: Enables compliance with Level 4 pin injection (Waveform 4) and Class 5 lightning (IEC 61000-4-5) using a single discrete device. | Use Scenario: Safeguarding 12 V/24 V ECU supply inputs from alternator load dump transients during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of DC-DC converters and microcontrollers. Use Value: Clamps to 24.4 V within 100 ps, preventing latch-up or overvoltage damage to 3.3 V/5 V logic domains. |
| Railway Signaling Interface | Industrial Motor Drive DC Link |
Use Scenario: Shielding Ethernet and CAN interfaces in track-side signaling units from induced surges due to nearby traction current switching. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), limiting let-through voltage to safe levels. Use Value: With 0.7 °C/W RθJC, sustains repeated 10/1000 μs surges at 0.05% duty cycle without thermal runaway. | Use Scenario: Protecting IGBT gate drivers and current sensors on 300–600 V DC link buses in variable-frequency drives exposed to inductive kickback. IC Role / Device Role / Timing Role: High-power TVS parallel to bulk capacitor, clamping voltage overshoot during rapid current interruption. Use Value: 18 kW PPP rating handles >700 A transient currents typical in 100 kW motor drives, reducing need for redundant clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | 600 W PPP rating, 5.0 mm × 3.5 mm SMB package, RθJA = 40 °C/W (no metal base) | Limited to single-stroke or low-duty-cycle surges; unsuitable for RTCA DO-160 multi-stroke validation | Select only for cost-sensitive industrial controls where 18 kW capability is unnecessary |
| SMCJ15A | 1500 W PPP, SMC package, 7.1 mm × 6.2 mm footprint, RθJC = 1.5 °C/W | Cannot meet DO-160 Level 4 pin injection or IEC 61000-4-5 Class 5 without parallel devices | Use when board space permits larger package and thermal design accommodates higher RθJC |
Compared with SMBJ15A and SMCJ15A, the MAPLAD18KP15A provides 30× and 12× higher peak pulse power respectively, direct metal-base thermal path for aerospace-grade reliability, and certified compliance with aviation surge standards - making it irreplaceable for mission-critical airborne power protection.
Availability
MAPLAD18KP15A is available at Aetrix Electronics and suitable for avionics power conditioning, automotive ECU protection, railway signaling interfaces, and industrial motor drive DC link safeguarding requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP15A 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, timing, and power solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP15A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning and load dump protection in safety-critical platforms where thermal robustness and certification compliance are non-negotiable.
FAQ
What is the maximum clamping voltage of the MAPLAD18KP15A under surge conditions?
The MAPLAD18KP15A has a maximum clamping voltage (VC) of 24.4 V at 738 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures downstream 28 V-rated components remain within safe operating voltage limits during transient events. The clamping performance is repeatable across multi-stroke testing per RTCA DO-160 Section 22.
Does the MAPLAD18KP15A require a heatsink for standard operation?
The MAPLAD18KP15A does not require an external heatsink for single-event surge suppression, but its 0.7 °C/W junction-to-case thermal resistance mandates direct soldering of the metal base to a minimum 250 mm² copper pour on FR4 PCB per recommended pad layout. For repetitive surge duty (>0.05% duty factor), forced airflow or thermal vias to internal ground planes are advised to maintain TJ < 150°C. The device's RθJA is 50 °C/W without heatsinking.
Is the MAPLAD18KP15A RoHS compliant and what is its moisture sensitivity level?
Yes, the MAPLAD18KP15A is RoHS compliant (e3 marking) and classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B - meaning it can be stored indefinitely at ambient conditions without dry pack requirements or bake-out prior to reflow. The device uses annealed matte-tin plating compatible with standard Pb-free soldering profiles up to 260°C for 10 seconds.
How does the MAPLAD18KP15A differ from bidirectional variants like MAPLAD18KP15CA?
The MAPLAD18KP15A is unidirectional (anode-cathode configuration), while MAPLAD18KP15CA is bidirectional (symmetrical breakdown). The "A" suffix indicates cathode on the metal base, making MAPLAD18KP15A suitable for DC power rails where polarity is fixed. MAPLAD18KP15CA is used in AC or data-line applications requiring protection against both polarities. Their clamping voltages, PPP, and thermal specs are identical, but circuit topology and grounding strategy differ fundamentally.
Can the MAPLAD18KP15A be used in automotive AEC-Q101 qualified designs?
Yes, the MAPLAD18KP15A is tested and qualified to AEC-Q101 for stress testing including HTGB, HTRB, and temperature cycling. It is explicitly listed in Microsemi's AEC-Q101 documentation for transient suppressors and supports automotive applications such as engine control units and ADAS power supplies. Full qualification reports and test data are available upon request for OEM validation.
MAPLAD18KP15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 738A
- 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
MAPLAD18KP15A FAQ
1.How can I place an order for MAPLAD18KP15A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP15A 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 MAPLAD18KP15A reliable?
The price and inventory of MAPLAD18KP15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP15A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP15A?
MAPLAD18KP15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP15A 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 MAPLAD18KP15A?
For technical support, including MAPLAD18KP15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP15A requirements.
6.How does Aetrix verify that MAPLAD18KP15A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP15A 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 MAPLAD18KP15A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP15A?
All MAPLAD18KP15A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP15A, 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 MAPLAD18KP15A part is unused and in its original packaging.
Return procedure for MAPLAD18KP15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP15A Tags
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