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Microchip Technology MAPLAD18KP7.0A
- Part No.:
- MAPLAD18KP7.0A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP7.0A.pdf
- Description:
- TVS DIODE 7VWM 12VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,267
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Product details
Overview
MPLAD18KP7.0A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power rails. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps to ≤12.0 V at 1500 A, and features a 7.0 V reverse standoff voltage (VWM) with breakdown voltage 7.78–8.60 V. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MPLAD18KP7.0A datasheet, MPLAD18KP7.0A pinout, MPLAD18KP7.0A application, or MPLAD18KP7.0A equivalent, key selection criteria include its 1500 A peak impulse current rating, 0.7 °C/W junction-to-case thermal resistance, low-profile PLAD package with metal-base cathode, and compliance with IEC 61000-4-5 (Class 1–5, 42 Ω source), ESD (IEC 61000-4-2), and EFT (IEC 61000-4-4).
Technical Context
The MPLAD18KP7.0A employs an avalanche diode structure optimized for fast response (<100 ps turn-on) and high-energy absorption without degradation under repeated transients. Its metal-base thermal path enables direct mounting to heatsinks, supporting sustained operation at TC = 100°C with 71 W steady-state dissipation capability when properly heatsinked.
It operates as a clamping device in parallel with protected circuitry, conducting only during overvoltage events exceeding V(BR). The unidirectional polarity and cathode-on-base configuration require PCB layout with thermal pad connection to ground or chassis for optimal thermal performance and electrical return path integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - supports single-event lightning surges per DO-160F Waveform 4/5A and IEC 61000-4-5 Level 5 |
| Reverse Standoff Voltage (VWM) | 7.0 V - maximum continuous DC or peak AC voltage before clamping initiates; matches 5 V rail systems with margin |
| Breakdown Voltage (V(BR)) | 7.78–8.60 V @ I(BR) - ensures reliable conduction onset above normal operating voltage |
| Max Clamping Voltage (VC) | 12.0 V @ 1500 A - limits downstream voltage stress to safe levels for 5 V logic and interface ICs |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink; critical for multi-pulse reliability |
| Steady-State Power Dissipation | 71 W @ TC = 100°C - defines maximum continuous power handling with active thermal management |
| Standby Current (ID) | 3000 μA @ VWM - low leakage preserves battery life in always-on vehicle modules |
Pinout & Package
The MPLAD18KP7.0A uses the PLAD (Power Leadless Array Device) surface-mount package: 12.32 × 10.54 mm body, 14.86 × 5.08 mm overall footprint, void-free UL94V-0 epoxy case, and tin-lead or RoHS-compliant matte-tin terminals. The cathode is the exposed metal base (bottom side), requiring thermal pad connection to PCB ground plane or heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top metallization) | Transient current entry point | Connected to protected line (e.g., 12 V battery feed); must route with low-inductance trace |
| Cathode (metal base) | Transient current return path & thermal interface | Must be soldered to large copper thermal pad tied to system ground/chassis; primary heat conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device protection against DO-160F Level 4/5 lightning injection and automotive load dump (ISO 7637-2 Pulse 5a) |
| 0.7 °C/W RθJC | Allows >10× higher pulse repetition rate vs. standard SMB/SMA TVS when mounted on heatsink |
| AEC-Q101 qualification | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| RTCA DO-160F Section 22 compliance | Guarantees multi-stroke lightning survivability required for avionics power distribution units and flight control interfaces |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for standard SMT reflow without baking |
Applications
| Aerospace Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in airborne power converters subjected to multi-stroke lightning transients per RTCA DO-160F Section 22. IC Role / Device Role / Timing Role: Primary clamping TVS placed at board edge before DC-DC converter input filter. Use Value: Withstands ≥500 pulses at 1500 A without parameter shift, ensuring mission-critical power continuity across flight cycles. | Use Scenario: Safeguarding microcontroller supply pins in engine control modules exposed to ISO 7637-2 Pulse 5a load dump (120 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional shunt protector on main 12 V rail upstream of LDO regulators. Use Value: Clamps 120 V surge to <12 V within 100 ps, preventing latch-up or permanent damage to 5 V logic ICs. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Secondary surge protection on 48 V DC bus feeding gate drivers and current sensors in variable-frequency drives. IC Role / Device Role / Timing Role: High-power TVS paralleled with MOVs to absorb repetitive switching transients and induced RFI. Use Value: 18 kW rating and 0.7 °C/W RθJC enable stable clamping voltage across 100+ surge events without thermal runaway. | Use Scenario: Protecting Ethernet PHY and CAN transceiver power rails in track-side signaling equipment subject to IEC 61000-4-5 Class 4 surges (4 kV, 42 Ω source). IC Role / Device Role / Timing Role: Standoff-voltage-matched TVS on isolated 5 V supply feeding communication ICs. Use Value: 7.0 V VWM avoids false triggering during nominal 5 V ±10% operation while clamping to 12.0 V during surge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.0A | 600 W PPP rating, 3.5 mm × 4.5 mm SMB package, RθJA = 40 °C/W, no metal-base thermal path | Limited to single-event or low-duty-cycle surges; unsuitable for DO-160F multi-stroke or automotive load dump | Select SMBJ7.0A only for cost-sensitive consumer-grade 5 V rail protection where energy is <100 J. |
| SMCJ7.0A | 1500 W PPP rating, 7.2 mm × 6.2 mm SMC package, RθJA = 25 °C/W, no direct heatsink interface | Cannot sustain >5 pulses at 1000 A; lacks AEC-Q101 and DO-160F certification documentation | Choose SMCJ7.0A for industrial PLC I/O modules with moderate surge exposure and no aviation qualification needs. |
Compared with SMBJ7.0A and SMCJ7.0A, the MPLAD18KP7.0A provides 30× higher peak power handling, a dedicated thermal interface enabling active cooling, and formal qualification for aerospace lightning and automotive load dump-making it the only option for safety-critical, high-repetition surge environments.
Availability
MPLAD18KP7.0A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and certified surge performance.
Supply support for MPLAD18KP7.0A 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, and timing solutions for aerospace, defense, and industrial markets.
The MPLAD series was developed specifically for high-energy transient suppression in safety-critical platforms where standard TVS devices fail under multi-stroke lightning or automotive load dump conditions.
FAQ
What is the maximum peak impulse current rating for MPLAD18KP7.0A?
The MPLAD18KP7.0A is rated for 1500 A peak impulse current (IPP) under the standard 10/1000 μs waveform. This value is confirmed in the Electrical Characteristics table (page 4 of RF01215 Rev B) and corresponds to its 18,000 W peak pulse power rating. The device maintains clamping voltage ≤12.0 V at this current level, ensuring downstream circuit protection.
Does MPLAD18KP7.0A require special PCB layout considerations?
Yes. The MPLAD18KP7.0A requires a thermal pad on the PCB connected to system ground or chassis, as the cathode is the metal base. Per the Package Dimensions drawing (page 7), the recommended pad layout measures 14.86 × 5.08 mm. This pad is essential for achieving the specified 0.7 °C/W junction-to-case thermal resistance and preventing thermal runaway during repeated surges.
Is MPLAD18KP7.0A compliant with automotive qualification standards?
Yes. The MPLAD18KP7.0A is explicitly tested and qualified to AEC-Q101, as stated in the "High-Reliability screening available" section (page 1) and confirmed in the "Tested in accordance with the requirements of AEC-Q101" banner. This qualification covers stress tests including temperature cycling, humidity, and mechanical shock-validating its use in under-hood automotive ECUs and power modules.
Can MPLAD18KP7.0A be used for bidirectional surge protection?
No. The MPLAD18KP7.0A is a unidirectional device, indicated by the "A" suffix (vs. "CA" for bidirectional variants like MPLAD18KP7.0CA). Its polarity is fixed: anode on top metallization, cathode on the metal base. For AC or dual-polarity rail protection, the bidirectional MPLAD18KP7.0CA must be selected instead.
What is the clamping voltage behavior of MPLAD18KP7.0A at lower surge currents?
The MPLAD18KP7.0A exhibits a dynamic clamping curve: VC = 12.0 V maximum at 1500 A (10/1000 μs), but drops significantly at lower currents-for example, ~8.5 V at 100 A. This behavior is inherent to avalanche diode physics and ensures minimal overvoltage stress during smaller transients like ESD or EFT, while still limiting worst-case events to safe levels for 5 V logic interfaces.
MAPLAD18KP7.0A 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
MAPLAD18KP7.0A FAQ
1.How can I place an order for MAPLAD18KP7.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP7.0A 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 MAPLAD18KP7.0A reliable?
The price and inventory of MAPLAD18KP7.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP7.0A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP7.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP7.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP7.0A?
MAPLAD18KP7.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP7.0A 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 MAPLAD18KP7.0A?
For technical support, including MAPLAD18KP7.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP7.0A requirements.
6.How does Aetrix verify that MAPLAD18KP7.0A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP7.0A 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 MAPLAD18KP7.0A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP7.0A?
All MAPLAD18KP7.0A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP7.0A, 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 MAPLAD18KP7.0A part is unused and in its original packaging.
Return procedure for MAPLAD18KP7.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP7.0A Tags
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