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Microchip Technology MPLAD18KP70A
- Part No.:
- MPLAD18KP70A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP70A.pdf
- Description:
- TVS DIODE 7VWM 12VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,883
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Product details
Overview
MPLAD18KP70A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤113 V under 1000 A impulse, and features a 70 V reverse standoff voltage (VWM) with 77.8–86.0 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 MPLAD18KP70A datasheet, MPLAD18KP70A pinout, MPLAD18KP70A application, or MPLAD18KP70A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant matte-tin terminations, and verified multi-stroke lightning compliance are mandatory design criteria.
Technical Context
The MPLAD18KP70A employs an avalanche diode structure optimized for fast response (<100 ps rise time) and stable clamping under repetitive transients. Its metal-base cathode construction enables direct thermal coupling to heatsinks, supporting sustained operation at TC = 100°C with 71 W steady-state dissipation capability when properly mounted.
It is characterized per AEC-Q101 and screened to MIL-PRF-19500 standards (optional upscreening). Electrical behavior is defined by strict limits on standby current (ID ≤ 10 μA @ 70 V), temperature coefficient of V(BR) (αV(BR) = 84 mV/°C), and clamping consistency across 1000 A pulses per Figure 3 derating curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 18,000 W @ 10/1000 μs - supports single-event lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 70 V - maximum continuous DC operating voltage before conduction begins |
| Clamping Voltage (VC) | ≤113 V @ IPP = 1000 A - defines worst-case rail overvoltage during surge |
| 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 external heatsink or PCB copper |
| Standby Current (ID) | ≤10 μA @ 70 V - negligible leakage in normal operation, critical for battery-backed systems |
| Temperature Coefficient (αV(BR)) | 84 mV/°C - quantifies V(BR) drift with junction temperature, essential for thermal design |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode termination. Void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; polarity marked by cathode on metal bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top-side lead) | Transient current entry point for unidirectional operation | Connected to protected line; conducts surge current toward cathode during overvoltage |
| Cathode (Metal base) | Current return path and primary thermal interface | Must be soldered to large copper pour or heatsink; serves as both electrical return and thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package with metal base | Enables high-power surge handling in space-constrained layouts while providing direct thermal path to PCB |
| RTCA DO-160F Waveform 4 Level 4 compliance | Validated for aircraft pin-injection immunity testing (6.4/69 μs, 25°C), eliminating need for external filtering |
| IEC 61000-4-5 Class 1–5 secondary lightning protection | Meets stringent 42 Ω source impedance requirements across full voltage range, simplifying system-level certification |
| 3σ lot norm screening on ID | Ensures consistent low-leakage performance across production lots for mission-critical power monitoring |
| AEC-Q101 qualified | Guarantees reliability under automotive temperature cycling, humidity, and mechanical stress conditions |
Applications
| Aerospace Avionics Power Bus Protection | Automotive 48V Mild Hybrid DC Link |
|---|---|
Use Scenario: Protecting 28 VDC avionics distribution buses against induced lightning transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between bus rail and chassis ground to shunt surge energy away from downstream converters and controllers. Use Value: Achieves Level 4 pin injection immunity without additional RC filters, reducing BOM count and board area while maintaining <10 μA standby leakage. | Use Scenario: Safeguarding 48 V battery management system (BMS) inputs against load dump spikes and alternator transients in mild hybrid vehicles. IC Role / Device Role / Timing Role: Primary surge suppression element on high-current DC input, absorbing >10 kA impulses without degradation. Use Value: Withstands 18 kW pulses at 10/1000 μs and maintains clamping below 113 V, preventing MOSFET gate oxide rupture and controller latch-up. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: Securing DC link capacitors in variable-frequency drives against switching-induced voltage spikes and regenerative energy surges. IC Role / Device Role / Timing Role: Fast-response TVS connected across DC+ and DC− rails to clamp transient overvoltages before they reach IGBT gate drivers. Use Value: Sub-100 ps response time ensures clamping occurs before sensitive gate drivers experience overvoltage stress, improving system MTBF. | Use Scenario: Protecting 72 V signaling power supplies in railway control cabinets from EFT bursts and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Secondary protection stage after upstream MOVs, providing precise clamping and low leakage for fail-safe monitoring circuits. Use Value: 10 μA max ID at 70 V prevents false triggering of undervoltage lockout, while 113 V VC ensures safe operation within 72 V ±15% nominal envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | 600 W PPP rating, 1.5 mm × 3.5 mm SMB package, RθJC ≈ 25 °C/W | Limited to sub-100 A surges; unsuitable for DO-160F Level 4 or IEC 61000-4-5 Class 4/5 | Select only for cost-sensitive, low-energy consumer applications where 18 kW capability is unnecessary |
| SMCJ70A | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJC ≈ 12 °C/W | Cannot meet 1000 A impulse requirement of MPLAD18KP70A; lacks DO-160F validation data | Acceptable for industrial PLC I/O protection but not for aerospace or high-reliability automotive DC bus use |
Compared with SMBJ70A and SMCJ70A, the MPLAD18KP70A provides 30× higher peak power handling, 35× lower thermal resistance, and certified compliance with aviation and heavy-duty lightning standards-making it the sole choice for systems requiring validated multi-stroke survivability and minimal thermal derating.
Availability
MPLAD18KP70A is available at Aetrix Electronics and suitable for aerospace avionics, automotive 48V power systems, and industrial motor drive designs requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.
Supply support for MPLAD18KP70A 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 MPLAD18KP70A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where thermal robustness and regulatory compliance are non-negotiable.
FAQ
What is the maximum clamping voltage of the MPLAD18KP70A under a 1000 A surge?
The MPLAD18KP70A has a maximum clamping voltage (VC) of 113 V when subjected to a 1000 A peak impulse current at the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and is measured per Figure 3 in the RF01215 datasheet. The MPLAD18KP70A maintains this clamping performance even after multiple surge events due to its low thermal resistance and robust silicon die construction.
Is the MPLAD18KP70A RoHS compliant?
Yes, the MPLAD18KP70A is RoHS compliant and carries the "e3" designation in its nomenclature, indicating annealed matte-tin plating that meets EU Directive 2011/65/EU. The device uses void-free UL94V-0 thermosetting epoxy and is manufactured with lead-free assembly processes. Full RoHS documentation and test reports are available upon request for MPLAD18KP70A procurement.
How is thermal management implemented for the MPLAD18KP70A?
The MPLAD18KP70A relies on its metal-base cathode as the primary thermal interface, requiring direct soldering to a large copper pad or external heatsink. With a junction-to-case thermal resistance of 0.7 °C/W, effective heat extraction is achievable only when the metal base is fully wetted and thermally coupled. The recommended pad layout (per RF01215 page 7) specifies minimum copper area and via placement to maintain TJ ≤ 150°C during 18 kW pulses.
Does the MPLAD18KP70A meet AEC-Q101 qualification?
Yes, the MPLAD18KP70A is tested and qualified to AEC-Q101 Rev D for discrete semiconductors. This includes stress tests for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life. The qualification applies to the full MPLAD18KP7.0A–200CA family, and test reports for MPLAD18KP70A are available through Microchip's component qualification database.
What is the polarity configuration of the MPLAD18KP70A?
The MPLAD18KP70A is a unidirectional TVS diode, with the cathode located on the metal base (bottom surface) and the anode on the top-side lead. This polarity is clearly indicated in the device marking and must be observed during PCB layout: the metal base must be connected to the system ground or lowest-potential reference plane to ensure proper surge conduction. Reversing polarity will prevent clamping and may cause catastrophic failure.
MPLAD18KP70A 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 1500A (1.5kA)
- 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
MPLAD18KP70A FAQ
1.How can I place an order for MPLAD18KP70A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP70A 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 MPLAD18KP70A reliable?
The price and inventory of MPLAD18KP70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP70A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP70A?
MPLAD18KP70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP70A 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 MPLAD18KP70A?
For technical support, including MPLAD18KP70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP70A requirements.
6.How does Aetrix verify that MPLAD18KP70A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP70A 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 MPLAD18KP70A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP70A?
All MPLAD18KP70A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP70A, 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 MPLAD18KP70A part is unused and in its original packaging.
Return procedure for MPLAD18KP70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP70A Tags
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