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Microchip Technology MAPLAD18KP85A
- Part No.:
- MAPLAD18KP85A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP85A.pdf
- Description:
- TVS DIODE 85VWM 137VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,305
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Product details
Overview
MPLAD18KP85A 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 ≤137 V under 1000 A peak impulse current, and features a 85 V reverse standoff voltage (VWM) with 94.4–104.0 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.
For engineers reviewing the MPLAD18KP85A datasheet, MPLAD18KP85A pinout, MPLAD18KP85A application, or MPLAD18KP85A equivalent, this device serves as a high-reliability secondary lightning protector in avionics power buses, automotive load-dump circuits, and DC-fed industrial controls where thermal resistance minimization and multi-stroke surge endurance are critical.
Technical Context
The MPLAD18KP85A employs an avalanche diode structure optimized for low clamping ratio and minimal thermal resistance (RθJC = 0.7 °C/W). Its metal-base package enables direct heat sinking, supporting sustained operation under repetitive 0.05% duty-cycle surges per Figure 1.
It complies with IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), ESD per IEC 61000-4-2 (±30 kV air), and EFT per IEC 61000-4-4 (±4 kV), with polarity-specific cathode-on-base configuration confirmed in the nomenclature and mechanical notes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - supports single-stroke lightning-level energy without failure |
| Reverse Standoff Voltage (VWM) | 85 V - maximum continuous DC or peak AC voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 94.4–104.0 V @ I(BR) - defines guaranteed avalanche onset window for design margining |
| Max Clamping Voltage (VC) | 137 V @ 1000 A - limits downstream component stress during worst-case surge |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables efficient heat transfer to heatsink, critical for multi-pulse reliability |
| Standby Current (ID) | 10 μA @ 85 V - ensures negligible leakage in standby power rails |
| Junction Temp Range | −55 to +150 °C - validated for extended operation in engine bay and avionics bays |
Pinout & Package
Package: Surface-mount PLAD (Plastic Low-profile Anode-down) with metal base acting as cathode terminal. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈ 1 g. Cathode is electrically connected to the exposed metal base (bottom side); anode is on top-side metallization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and high-current return node; must be soldered to copper pour or heatsink |
| Top Metallization | Anode | Input connection point for protected line; requires controlled trace width for surge current routing |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT construction | Enables placement on high-density PCBs while maintaining 18 kW surge capability without through-hole mounting |
| AEC-Q101 qualification | Validates robustness for automotive powertrain and chassis applications including load dump transients |
| RTCA DO-160F Waveform 4 Level 4 compliance | Guarantees survivability against 6.4/69 μs pin-injection surges up to 85 V VWM devices |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for standard reflow assembly |
| RoHS-compliant (e3 marking) | Meets global environmental regulations without compromising surge performance or thermal reliability |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
|
Use Scenario: 28 V DC distribution bus in commercial aircraft avionics racks subject to DO-160 Section 22 multi-stroke lightning transients. IC Role / Device Role / Timing Role: Secondary TVS clamp placed downstream of primary filters to limit voltage overshoot during repeated 10/1000 μs surges. Use Value: With 137 V clamping at 1000 A and RθJC = 0.7 °C/W, it sustains >50 strokes at 0.05% duty cycle without thermal runaway. |
Use Scenario: 12 V battery-fed engine control unit (ECU) exposed to ISO 7637-2 Pulse 5a (load dump) events up to 120 V. IC Role / Device Role / Timing Role: Unidirectional shunt protector across input rail, triggered only above 85 V to avoid false conduction during cranking. Use Value: 85 V VWM ensures no conduction during normal 14.4 V alternator regulation, while 137 V VC protects 150 V-rated MOSFETs and regulators. |
| Industrial DC Power Feeds | Railway Signaling Interfaces |
|
Use Scenario: 48 V DC power input to programmable logic controller (PLC) I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor guarding against induced surges from nearby motor switching and relay coil flyback. Use Value: 18 kW PPP rating and 10 μA ID @ 85 V ensure immunity to 4 kV EFT bursts (IEC 61000-4-4) without degrading standby efficiency. |
Use Scenario: 72 V signaling interface in European railway signaling equipment requiring EN 50121-3-2 surge immunity. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MPLAD18KP85CA) used in differential pairs; unidirectional MPLAD18KP85A applied to single-ended supply lines. Use Value: Validated for IEC 61000-4-5 Class 4 (42 Ω source) ensures compliance with rail EMC standards without external series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ85A | Lower PPP (400 W), smaller SMA package, RθJA = 50 °C/W (no metal base) | Suitable for consumer-grade 12–24 V systems; not rated for DO-160 or AEC-Q101 | Select when cost and board space outweigh multi-stroke reliability and aerospace qualification needs. |
| Vishay VMM18K85A | Same 18 kW PPP and PLAD package, but V(BR) = 95–105 V and VC = 139 V; RoHS e2 (not e3) | Compatible in footprint and clamping, but lacks DO-160F Waveform 4 validation and AEC-Q101 certification | Use where identical electrical specs suffice and qualification documentation is not required for end-equipment certification. |
Compared with SMAJ85A and VMM18K85A, the MPLAD18KP85A provides certified aerospace-grade reliability, lower thermal resistance via metal-base mounting, and documented compliance with RTCA DO-160F and AEC-Q101-making it the only choice for safety-critical, multi-stroke surge environments.
Availability
MPLAD18KP85A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial DC power feeds requiring stable component supply across long production lifecycles.
Supply support for MPLAD18KP85A 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) designs high-reliability analog, mixed-signal, and power semiconductors for aerospace, defense, and industrial markets.
The MPLAD18KP85A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for secondary lightning protection and multi-stroke surge resilience in mission-critical power systems.
FAQ
What is the clamping voltage of the MPLAD18KP85A at its rated peak pulse current?
The MPLAD18KP85A has a maximum clamping voltage (VC) of 137 V at 1000 A peak pulse current under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MPLAD18KP85A maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is the MPLAD18KP85A qualified for automotive applications?
Yes, the MPLAD18KP85A is explicitly qualified to AEC-Q101 for stress testing including high-temperature operating life, temperature cycling, and surge robustness. Its 85 V VWM and 137 V VC align with ISO 7637-2 Pulse 5a requirements for 12 V systems, and its metal-base thermal design supports sustained operation in under-hood environments. The MPLAD18KP85A data sheet confirms AEC-Q101 compliance in the "High-Reliability screening" section.
How does the MPLAD18KP85A differ from bidirectional variants like MPLAD18KP85CA?
The MPLAD18KP85A is unidirectional, with cathode on the metal base and anode on top metallization, intended for DC line protection where polarity is fixed. The MPLAD18KP85CA adds symmetrical bidirectional clamping for AC or differential signal lines. Both share identical PPP (18,000 W), VWM (85 V), and package dimensions, but the CA version exhibits matched clamping in both directions and is marked with "CA" suffix per nomenclature rules in RF01215.
Does the MPLAD18KP85A require special handling for moisture sensitivity?
No, the MPLAD18KP85A has IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1 rating, meaning it has no floor-life limitation and does not require dry-packaging or baking prior to reflow. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during standard lead-free reflow profiles, as confirmed in the "MECHANICAL and PACKAGING" section of RF01215 Rev B.
Can the MPLAD18KP85A be used for RTCA DO-160F lightning protection?
Yes, the MPLAD18KP85A is validated for RTCA DO-160F Section 22 multi-stroke lightning and specifically rated for Waveform 4 (6.4/69 μs) Level 4 protection per the "Pin injection protection" table in RF01215 Rev B. Its 18 kW PPP rating, low RθJC, and cumulative heating mitigation make it suitable for aircraft power bus secondary protection where repeated strikes must be absorbed without degradation.
MAPLAD18KP85A 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 132A
- 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
MAPLAD18KP85A FAQ
1.How can I place an order for MAPLAD18KP85A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP85A 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 MAPLAD18KP85A reliable?
The price and inventory of MAPLAD18KP85A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP85A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP85A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP85A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP85A?
MAPLAD18KP85A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP85A 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 MAPLAD18KP85A?
For technical support, including MAPLAD18KP85A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP85A requirements.
6.How does Aetrix verify that MAPLAD18KP85A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP85A 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 MAPLAD18KP85A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP85A?
All MAPLAD18KP85A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP85A, 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 MAPLAD18KP85A part is unused and in its original packaging.
Return procedure for MAPLAD18KP85A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP85A Tags
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