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Microchip Technology MPLAD18KP14A
- Part No.:
- MPLAD18KP14A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP14A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,597
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Product details
Overview
MPLAD18KP14A 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 ≤23.2 V under 776 A peak impulse current, and features a 14 V reverse standoff voltage (VWM) with 15.6–17.2 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 MPLAD18KP14A datasheet, MPLAD18KP14A pinout, MPLAD18KP14A application, or MPLAD18KP14A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance, sub-100 ps response time, and MIL-PRF-19500 upscreening capability are critical - especially in avionics power distribution, 24 V/28 V aircraft subsystems, and load-dump-prone vehicle ECUs.
Technical Context
The MPLAD18KP14A employs an avalanche diode structure optimized for fast transient response (<100 ps rise to clamping), with junction-to-case thermal resistance of just 0.7 °C/W enabling effective heat transfer to PCB copper or heatsink. Its unidirectional polarity places the cathode on the metal baseplate, requiring bottom-side thermal mounting per recommended pad layout.
It operates within -55 °C to +150 °C junction temperature range and supports steady-state dissipation of 2.5 W at 25 °C ambient or 71 W at 100 °C case temperature. Compliance includes AEC-Q101 qualification, RoHS (e3), UL94V-0 epoxy body, and IEC 61000-4-2/4-4 ESD/EFT immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous DC or peak AC voltage the device blocks without conduction. |
| V(BR) min/max | 15.6–17.2 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance. |
| VC @ IPP | ≤23.2 V at 776 A - Clamping voltage during worst-case 10/1000 μs surge, limiting downstream voltage stress. |
| PPP | 18,000 W - Peak pulse power handling at 10/1000 μs, enabling multi-stroke lightning survival per DO-160 Section 22. |
| RθJC | 0.7 °C/W - Low junction-to-case thermal resistance allows efficient heat transfer to heatsink or copper pour. |
| ID @ VWM | ≤10 μA - Ultra-low leakage ensures minimal standby power loss in high-impedance circuits. |
| tclamping | <100 ps - Sub-nanosecond response enables protection of fast-switching MOSFETs and gate drivers. |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal baseplate cathode termination. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Void-free UL94V-0 epoxy body; matte-tin plating compliant with MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top side) | Positive terminal for unidirectional operation | Connected to protected line; conducts only during reverse overvoltage events. |
| Cathode (metal baseplate) | Ground reference / heat sink interface | Must be soldered to large copper area or heatsink for thermal management and low-inductance return path. |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW pulse rating | Enables single-device protection against severe lightning-induced transients (DO-160F Waveform 4 Level 4) without parallel stacking. |
| 0.7 °C/W RθJC | Allows >70 W steady-state power dissipation at TC = 100 °C, supporting high-duty-cycle surge environments. |
| Sub-100 ps response | Protects sensitive gate drivers and ADC inputs from nanosecond-scale EFT bursts and RF-induced spikes. |
| AEC-Q101 qualified | Validated for automotive under-hood applications including alternator load dump and ISO 7637-2 compliance. |
| MIL-PRF-19500 upscreening option | Supports high-reliability programs requiring lot traceability, 3σ ID screening, and extended burn-in per military standards. |
Applications
| Aircraft Power Distribution Units | Automotive Engine Control Units |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in airborne PDUs subject to RTCA DO-160F Section 22 lightning injection. IC Role / Device Role / Timing Role: Primary transient clamp placed upstream of DC-DC converters and solid-state power controllers. Use Value: Withstands ≥1000A 10/1000 μs surges while maintaining clamping below 23.2 V, preserving downstream 30 V-rated components. | Use Scenario: Load dump suppression on 12 V/24 V engine control module power rails during alternator field cutoff. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy directly to chassis ground via metal baseplate. Use Value: 18 kW rating eliminates need for parallel devices; 0.7 °C/W RθJC enables reliable operation without external heatsink in compact ECU enclosures. |
| Industrial Motor Drive DC Links | Railway Signaling Power Supplies |
Use Scenario: Safeguarding IGBT gate driver supplies and auxiliary 24 V rails against switching transients and induced RFI in VFDs. IC Role / Device Role / Timing Role: Fast-response clamp on isolated auxiliary supply outputs to prevent false triggering and latch-up. Use Value: <100 ps response time prevents nanosecond edge-induced misfiring; low ID (≤10 μA) avoids loading precision bias networks. | Use Scenario: Secondary surge protection on 110 V DC signaling power inputs exposed to track-induced lightning coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS deployed after primary MOV-based protection to refine clamping level and extend system lifetime. Use Value: Meets IEC 61000-4-5 Class 4 (42 Ω source) with VC ≤23.2 V, reducing stress on downstream DC/DC isolators by >35% vs. standard 1.5KE parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | 600 W PPP rating, 5.0 mm × 3.5 mm SMB package, RθJC ≈ 25 °C/W | Limited to single-stroke surges; unsuitable for DO-160 multi-stroke or repeated load dump events. | Select only for cost-sensitive, low-energy consumer electronics where 18 kW capability is unnecessary. |
| SMCJ14A | 1500 W PPP, SMC package, RθJC ≈ 10 °C/W, same VWM but lower VC (23.2 V vs. 24.4 V) | Cannot meet DO-160F Level 4 pin injection or IEC 61000-4-5 Class 5 without derating or parallel use. | Acceptable for industrial PLC I/O protection where full 18 kW headroom is not required and board space permits larger SMC footprint. |
Compared with SMBJ14A and SMCJ14A, the MPLAD18KP14A provides 30× and 12× higher pulse power handling respectively, enabling single-device compliance with aviation lightning standards and eliminating thermal derating concerns in high-repetition surge environments.
Availability
MPLAD18KP14A is available at Aetrix Electronics and suitable for aircraft power distribution, automotive engine control, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.
Supply support for MPLAD18KP14A 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 ICs for aerospace, defense, and industrial markets.
The MPLAD18KP14A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection and automotive load dump compliance in mission-critical power systems.
FAQ
What is the maximum clamping voltage of the MPLAD18KP14A under rated surge conditions?
The MPLAD18KP14A has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 776 A at the 10/1000 μs waveform. This value is measured per Figure 3 in the RF01215 datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The MPLAD18KP14A maintains this clamping performance across its full operating temperature range when properly mounted.
Does the MPLAD18KP14A require a heatsink for continuous operation?
The MPLAD18KP14A does not require an external heatsink for transient suppression duty, but its 71 W steady-state power dissipation capability at TC = 100 °C depends on direct thermal coupling to a large PCB copper area or heatsink via its metal baseplate cathode. Without such thermal management, sustained power dissipation above 2.5 W at TA = 25 °C will exceed junction temperature limits. Proper pad layout per the datasheet is essential for MPLAD18KP14A reliability.
Is the MPLAD18KP14A compliant with automotive qualification standards?
Yes, the MPLAD18KP14A is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units and body electronics. It is specifically designed to withstand alternator load dump transients per ISO 7637-2 and supports high-temperature under-hood environments with a -55 °C to +150 °C operating junction range. The MPLAD18KP14A also meets ESD immunity per IEC 61000-4-2 and EFT per IEC 61000-4-4.
How does the MPLAD18KP14A differ from bidirectional versions like MPLAD18KP14CA?
The MPLAD18KP14A is unidirectional, meaning it conducts only during reverse-biased overvoltage events and blocks forward current - ideal for DC rail protection. In contrast, MPLAD18KP14CA is bidirectional and symmetric, protecting both polarities, making it suitable for AC lines or differential signal paths. The MPLAD18KP14A's cathode is on the metal baseplate, whereas the CA variant has center-tap symmetry and different clamping behavior in forward conduction.
Can the MPLAD18KP14A be used in parallel for higher current handling?
Parallel operation of MPLAD18KP14A devices is not recommended due to parameter variation (e.g., V(BR) tolerance of 15.6–17.2 V) causing current imbalance and potential thermal runaway. The device is engineered for standalone 18 kW pulse handling; if higher current capacity is needed, select a higher-voltage variant with matching VC or consult Microsemi's application guidance. Derating curves in Figure 6 of RF01215 must be applied for MPLAD18KP14A multi-pulse scenarios.
MPLAD18KP14A 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 776A
- 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
MPLAD18KP14A FAQ
1.How can I place an order for MPLAD18KP14A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP14A 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 MPLAD18KP14A reliable?
The price and inventory of MPLAD18KP14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP14A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP14A?
MPLAD18KP14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP14A 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 MPLAD18KP14A?
For technical support, including MPLAD18KP14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP14A requirements.
6.How does Aetrix verify that MPLAD18KP14A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP14A 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 MPLAD18KP14A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP14A?
All MPLAD18KP14A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP14A, 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 MPLAD18KP14A part is unused and in its original packaging.
Return procedure for MPLAD18KP14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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