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Microchip Technology MAPLAD18KP16A
- Part No.:
- MAPLAD18KP16A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP16A.pdf
- Description:
- TVS DIODE 16VWM 26VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,080
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Product details
Overview
MPLAD18KP16A 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 ≤26.0 V under 693 A peak impulse current, and features a 16 V reverse standoff voltage (VWM) with 17.8–19.7 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for aircraft electronics.
For engineers reviewing the MPLAD18KP16A datasheet, MPLAD18KP16A pinout, MPLAD18KP16A application, or MPLAD18KP16A equivalent, key selection criteria include its 18 kW surge rating, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, IEC 61000-4-5 Class 1–5 secondary lightning compliance, and suitability for load dump and multi-stroke lightning protection in safety-critical avionics and vehicle ECUs.
Technical Context
The MPLAD18KP16A employs a silicon avalanche diode structure optimized for fast response (<100 ps clamping latency) and high cumulative energy handling. Its metal-base cathode construction enables direct thermal coupling to heatsinks, supporting sustained operation under repetitive 0.05% duty-cycle transients per Figure 1.
It operates within –55°C to +150°C junction temperature range and maintains stable clamping performance across temperature via a +0.0016 mV/°C breakdown voltage coefficient. Standby leakage is limited to 10 μA at 16 V, ensuring minimal impact on upstream bias networks in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains full-rated surge without degradation when mounted per recommended pad layout |
| Reverse Standoff Voltage (VWM) | 16 V - maximum continuous DC or peak AC voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 17.8–19.7 V @ I(BR) - defines minimum clamping threshold under specified test current |
| Max Clamping Voltage (VC) | 26.0 V @ 693 A - limits downstream component stress during worst-case surge event |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Standby Leakage Current | 10 μA @ 16 V - negligible power loss in standby mode; compatible with low-power sensor interfaces |
| Clamping Response Time | <100 ps - sub-nanosecond turn-on ensures protection of high-speed digital and RF circuitry |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode terminal on underside; void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; weight ≈1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top-side lead) | Input/Line terminal | Connected to protected line (e.g., 12 V battery rail); accepts positive surge polarity |
| Cathode (Metal base) | Ground/reference terminal | Must be soldered to large copper pour or heatsink for thermal and electrical return path |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer lot traceability | Enables full process chain audit for aerospace and defense programs requiring MIL-PRF-19500 upscreening |
| RTCA DO-160F Waveform 4 compliance (Level 4) | Validated for 6.4/69 μs pin injection surges in aircraft avionics bays without additional filtering |
| IEC 61000-4-5 secondary lightning protection | Meets Class 1–5 requirements with 42 Ω source impedance, enabling use in main power distribution units |
| Moisture sensitivity Level 1 | No dry pack or bake-out required prior to reflow, reducing manufacturing overhead and floor-life constraints |
| AEC-Q101 qualification | Validated for automotive under-hood environments including thermal cycling, humidity, and mechanical shock |
Applications
| Aircraft Power Distribution Units | Automotive Engine Control Units |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in airborne power management modules against lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient suppression device placed directly at connector entry point to shunt >10 kA surges to chassis ground. Use Value: Enables single-device compliance with multi-stroke lightning standard without series impedance or active clamping circuits. | Use Scenario: Safeguarding microcontroller supply rails in diesel engine control units exposed to ISO 7637-2 Load Dump pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping 12 V system rail during alternator field collapse events. Use Value: Limits rail voltage to ≤26 V during 120 V/400 ms load dump, preventing MCU brownout or latch-up. |
| Industrial Motor Drive DC Links | Railway Signaling Power Supplies |
Use Scenario: Suppressing switching transients on 400 V DC link capacitors in variable-frequency drives subjected to IGBT commutation noise. IC Role / Device Role / Timing Role: Fast-response TVS absorbing high-di/dt spikes generated by power semiconductor switching. Use Value: Reduces need for snubber networks and extends electrolytic capacitor lifetime by limiting voltage overshoot. | Use Scenario: Securing 72 V DC backup power inputs in trackside signaling relays against induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), handling residual energy per IEC 61000-4-5. Use Value: Achieves Class 4 immunity with 2 Ω source impedance, meeting EN 50121-3-2 for rolling stock EMC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Semtech RClamp0524P.TCT | Lower 400 W PPP rating; 5 V VWM; SOD-323 package; 12 pF capacitance | Targeted at high-speed data lines (USB, Ethernet), not power rail protection | Select only for signal-line ESD protection where low capacitance and small footprint outweigh power-handling needs |
| Littelfuse SMAJ16A | Same 16 V VWM and unidirectional polarity but rated for 400 W PPP; DO-214AC package; higher RθJA (50 °C/W) | Cost-sensitive industrial controls where 18 kW surge capability is unnecessary | Choose when surge threat level is limited to IEC 61000-4-2/4-4 and thermal budget allows ambient-only cooling |
Compared with RClamp0524P.TCT and SMAJ16A, the MPLAD18KP16A provides 45× higher peak power handling and 0.7 °C/W thermal resistance-critical for protecting high-current power rails in aerospace and heavy-duty automotive systems where sustained surge energy and thermal management dominate design constraints.
Availability
MPLAD18KP16A 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 MPLAD18KP16A 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 MPLAD18KP16A belongs to Microsemi's high-power PLAD family, engineered specifically for multi-stroke lightning and load dump protection in mission-critical platforms where failure is not an option.
FAQ
What is the maximum clamping voltage of the MPLAD18KP16A under surge conditions?
The MPLAD18KP16A has a maximum clamping voltage (VC) of 26.0 V when subjected to its rated peak pulse current of 693 A at the 10/1000 μs waveform. This value is measured per Figure 3 in the RF01215 datasheet and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events, ensuring robust protection for 16 V nominal systems.
Is the MPLAD18KP16A suitable for automotive under-hood applications?
Yes, the MPLAD18KP16A is AEC-Q101 qualified and rated for operation from –55°C to +150°C junction temperature. Its low thermal resistance (0.7 °C/W) and validated performance under ISO 7637-2 load dump conditions make it suitable for engine control units, battery management systems, and other under-hood automotive electronics requiring high-reliability surge suppression.
Does the MPLAD18KP16A require special PCB layout considerations?
Yes-the MPLAD18KP16A's metal base cathode must be soldered to a large copper area or heatsink to achieve its specified 0.7 °C/W thermal resistance and full 18,000 W pulse rating. The recommended pad layout (shown in RF01215 Rev B, page 7) specifies minimum copper dimensions and thermal vias; deviation reduces power derating and may cause thermal runaway during repetitive surges.
How does the MPLAD18KP16A perform under RTCA DO-160F lightning test standards?
The MPLAD18KP16A is certified for RTCA DO-160F Section 22 multi-stroke lightning and Waveform 4 (6.4/69 μs) pin injection at Level 4. It meets these requirements without external filtering due to its sub-100 ps response time and ability to clamp below 26 V while dissipating up to 18 kW-making it ideal for avionics power entry protection where size and reliability are paramount.
What is the polarity configuration and marking convention for the MPLAD18KP16A?
The MPLAD18KP16A is unidirectional, with the cathode located on the metal base (underside) and the anode on the top-side lead. Per the nomenclature guide in RF01215, the "A" suffix denotes unidirectional construction; polarity is confirmed by body marking and the "cathode is the metal base" note in the datasheet. Correct orientation is essential to avoid destructive forward conduction during surge events.
MAPLAD18KP16A 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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 693A
- 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
MAPLAD18KP16A FAQ
1.How can I place an order for MAPLAD18KP16A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP16A 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 MAPLAD18KP16A reliable?
The price and inventory of MAPLAD18KP16A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP16A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP16A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP16A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP16A?
MAPLAD18KP16A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP16A 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 MAPLAD18KP16A?
For technical support, including MAPLAD18KP16A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP16A requirements.
6.How does Aetrix verify that MAPLAD18KP16A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP16A 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 MAPLAD18KP16A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP16A?
All MAPLAD18KP16A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP16A, 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 MAPLAD18KP16A part is unused and in its original packaging.
Return procedure for MAPLAD18KP16A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP16A Tags
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