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Microchip Technology MPLAD18KP70CA
- Part No.:
- MPLAD18KP70CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP70CA.pdf
- Description:
- TVS DIODE 70VWM 113VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,729
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Product details
Overview
MPLAD18KP70CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 70 V reverse standoff voltage (VWM), clamps to ≤113 V at 100 A peak impulse current, and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MPLAD18KP70CA datasheet, MPLAD18KP70CA pinout, MPLAD18KP70CA application, or MPLAD18KP70CA equivalent, this device is selected for high-reliability DC bus protection in avionics power distribution units, engine control modules, and airborne communication interfaces where multi-stroke lightning immunity and low thermal resistance are critical.
Technical Context
The MPLAD18KP70CA employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and low junction-to-case thermal resistance (0.7 °C/W). Its bidirectional construction enables symmetrical clamping on both polarities without external circuitry, supporting AC-coupled signal lines and floating DC rails.
It is rated for operation from –55 °C to +150 °C, undergoes 100% surge testing per AEC-Q101, and supports MIL-PRF-19500 upscreening options including M, MA, MX, and MXL reliability levels - with full wafer and assembly lot traceability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 18,000 W @ 10/1000 μs - sustains repeated lightning surges without degradation under 0.05% duty cycle |
| Reverse Standoff Voltage (VWM) | 70 V - maximum continuous DC or peak AC voltage before conduction begins |
| Clamping Voltage (VC) | ≤113 V @ 100 A - limits downstream IC voltage stress during surge events |
| Breakdown Voltage (V(BR)) | 77.8–86.0 V @ I(BR) - ensures reliable turn-on margin above VWM |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper pour or heatsink |
| Clamping Response Time | <5 ns - protects sensitive analog and digital inputs against fast transients |
| Steady-State Power Dissipation | 2.5 W @ TA = 25°C - defines safe continuous bias conditions without surge |
Pinout & Package
Surface-mount package with two terminals: cathode and anode formed on opposite sides of the metal base. The device uses a low-profile void-free thermosetting epoxy case (UL94V-0) with tin-lead or RoHS-compliant matte-tin plating. Recommended pad layout per RF01215 Rev B provides optimal thermal conduction and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive-side terminal for bidirectional conduction | Connects to protected line; forms one side of symmetrical clamping path |
| Cathode | Negative-side terminal (metal base) | Mounted directly to PCB ground plane or thermal pad; primary heat path to board |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or floating DC buses without polarity constraints |
| RTCA DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin injection surges in aircraft electronics - no additional filtering required |
| IEC 61000-4-5 Class 1–5 support (42 Ω source) | Meets full secondary lightning immunity across all commercial and military aviation equipment classes |
| 0.7 °C/W RθJC | Reduces thermal derating impact - maintains 100% PPP rating up to TC = 100°C with proper PCB layout |
| AEC-Q101 qualified | Guarantees robustness for automotive under-hood applications including load dump and ISO 7637-2 transients |
Applications
| Avionics Power Distribution Unit | Automotive Engine Control Module |
|---|---|
Use Scenario: Protecting 28 V DC main bus in airborne power management systems against lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary surge shunt element placed at bus entry point, clamping energy before it reaches DC-DC converters and microcontrollers. Use Value: Eliminates need for cascaded TVS + MOV stages; single MPLAD18KP70CA handles multi-stroke events up to 18 kW without parameter drift. | Use Scenario: Safeguarding 12 V/24 V sensor and actuator interfaces in diesel engine control units exposed to ISO 7637-2 Pulse 5a/b load dump. IC Role / Device Role / Timing Role: Bidirectional clamp across supply rail and ground, absorbing >1000 V transients within nanoseconds. Use Value: Prevents latch-up and gate oxide damage in MCU I/O and CAN transceivers while maintaining <5 ns response. |
| Industrial Motor Drive DC Link | Marine Communication Interface |
Use Scenario: Shielding IGBT gate drivers and current sense amplifiers on 300–400 V DC link from switching-induced voltage spikes and EFT noise. IC Role / Device Role / Timing Role: Low-inductance parallel TVS across DC bus capacitors to suppress dV/dt overshoot during IGBT commutation. Use Value: Reduces radiated emissions by limiting peak transient amplitude to ≤113 V, easing EMC filter design. | Use Scenario: Hardening RS-485 and Ethernet PHY lines on shipboard navigation systems against salt-mist-accelerated lightning coupling. IC Role / Device Role / Timing Role: Bidirectional protection on differential pairs, referenced to chassis ground via metal base mounting. Use Value: Maintains signal integrity during 42 Ω IEC 61000-4-5 Class 4 surges without data corruption or PHY reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA | 600 W PPP rating, 1.5× higher clamping voltage (119 V), SMC package with higher RθJA (40 °C/W) | Limited to single-stroke events; unsuitable for DO-160 multi-stroke or automotive load dump repetition | Select only for cost-sensitive industrial controls with infrequent surges and adequate thermal margin |
| SMCJ70CA | 1500 W PPP, same VWM/clamp specs but lower thermal performance (RθJC = 1.5 °C/W), no AEC-Q101 or DO-160 qualification | Requires larger PCB copper area; not approved for flight-critical or automotive safety systems | Acceptable for non-safety-rated telecom power supplies where qualification documentation is not mandated |
Compared with SMBJ70CA and SMCJ70CA, the MPLAD18KP70CA provides 30× higher peak power handling, certified multi-stroke endurance, and direct thermal path to PCB - making it the only option qualified for avionics and automotive powertrain applications demanding repeatable 18 kW surge absorption.
Availability
MPLAD18KP70CA is available at Aetrix Electronics and suitable for avionics power distribution, automotive engine control, and industrial motor drive applications requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for MPLAD18KP70CA 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) designs high-reliability semiconductor solutions for aerospace, defense, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and power protection components.
The MPLAD18KP70CA belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning protection in mission-critical platforms where thermal stability and qualification compliance are mandatory.
FAQ
What is the clamping voltage of the MPLAD18KP70CA at its rated peak pulse current?
The MPLAD18KP70CA has a maximum clamping voltage (VC) of 113 V when subjected to a 100 A peak impulse current under 10/1000 μs waveform conditions. This value is measured at 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The actual clamping voltage remains stable across temperature due to the device's low αV(BR) coefficient and robust thermal design.
Does the MPLAD18KP70CA meet AEC-Q101 qualification requirements?
Yes, the MPLAD18KP70CA is fully tested and qualified to AEC-Q101 standards for discrete semiconductors. This includes stress testing for temperature cycling, humidity bias, mechanical shock, and surge current - confirming suitability for automotive under-hood applications such as engine control modules and battery management systems. Full test reports are available upon request through Aetrix Electronics.
How does the bidirectional construction of the MPLAD18KP70CA affect its use in DC circuits?
The bidirectional construction of the MPLAD18KP70CA allows it to protect both positive and negative polarity transients on the same line without polarity sensitivity. In DC circuits, this enables placement across supply and ground with symmetric clamping behavior - ideal for protecting floating references, differential signaling lines, or systems subject to reverse-battery or load-dump reversal events. The cathode is the metal base, simplifying thermal mounting.
Can the MPLAD18KP70CA be used for RTCA DO-160F Section 22 lightning protection?
Yes, the MPLAD18KP70CA is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 compliance. Its 18,000 W rating, sub-5 ns response, and low thermal resistance ensure reliable performance across repeated strokes - a key requirement for aircraft electrical system certification.
What is the thermal resistance from junction to ambient (RθJA) for the MPLAD18KP70CA?
The MPLAD18KP70CA has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W when mounted on FR4 PCB with the recommended pad layout per RF01215 Rev B. However, its junction-to-case resistance (RθJC) is only 0.7 °C/W - meaning effective thermal management depends heavily on PCB copper area and grounding. For sustained surge duty, direct thermal connection of the metal base to a large ground plane is essential to maintain full 18 kW rating.
MPLAD18KP70CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 160A
- 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
MPLAD18KP70CA FAQ
1.How can I place an order for MPLAD18KP70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP70CA 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 MPLAD18KP70CA reliable?
The price and inventory of MPLAD18KP70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP70CA is usually 5 days.
3.What payment methods are accepted for MPLAD18KP70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP70CA?
MPLAD18KP70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP70CA 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 MPLAD18KP70CA?
For technical support, including MPLAD18KP70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP70CA requirements.
6.How does Aetrix verify that MPLAD18KP70CA is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP70CA 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 MPLAD18KP70CA meets industry standards.
7.What is the process for return or replacement of MPLAD18KP70CA?
All MPLAD18KP70CA units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP70CA, 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 MPLAD18KP70CA part is unused and in its original packaging.
Return procedure for MPLAD18KP70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP70CA Tags
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