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Microchip Technology MPLAD18KP8.5AE3
- Part No.:
- MPLAD18KP8.5AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP8.5AE3.pdf
- Description:
- TVS DIODE 85VWM 137VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,024
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Product details
Overview
MPLAD18KP8.5AE3 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, features a 8.5 V reverse standoff voltage (VWM), clamps to ≤14.4 V at 1250 A peak impulse current (IPP), and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation in lightning and load-dump protection circuits.
For engineers reviewing the MPLAD18KP8.5AE3 datasheet, MPLAD18KP8.5AE3 pinout, MPLAD18KP8.5AE3 application, or MPLAD18KP8.5AE3 equivalent, this device is selected for RTCA DO-160 Section 22 multi-stroke lightning compliance, IEC 61000-4-5 secondary lightning protection (Class 1–5, 42 Ω source), and ESD/EFT immunity per IEC 61000-4-2/4-4 - critical for avionics power inputs and 12 V/24 V vehicle ECUs.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector with avalanche breakdown behavior. Its unidirectional polarity enables DC-biased line protection where reverse conduction must be blocked, and its low RθJC (0.7 °C/W) supports direct mounting to metal heatsinks or copper pour for sustained multi-pulse operation under 0.05% duty cycle.
It meets RTCA DO-160F Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 requirements when mounted per recommended pad layout on FR4. The device is surge-tested per AEC-Q101 and offers RoHS-compliant matte-tin plating (e3 suffix) with UL94V-0 epoxy body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft lightning-induced transients without failure |
| Reverse Standoff Voltage (VWM) | 8.5 V - sets maximum continuous operating voltage before clamping activation |
| Breakdown Voltage (V(BR)) | 9.44–10.4 V @ I(BR) - defines precise avalanche onset threshold for predictable clamping |
| Clamping Voltage (VC) | ≤14.4 V @ IPP = 1250 A - limits downstream circuit voltage stress during worst-case surge |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables direct thermal coupling to heatsink for >2.5 W steady-state dissipation |
| Standby Current (ID) | ≤150 μA @ VWM - ensures negligible leakage in always-on 12 V rail monitoring |
| Junction Temp Range | −55 to +150 °C - supports operation in engine bay, avionics bays, and outdoor enclosures |
Pinout & Package
Package: Surface-mount PLAD (Power Leadless Array Device) with metal base cathode terminal. Void-free UL94V-0 epoxy body (12.32 × 10.54 × 5.08 mm), tin-lead or RoHS-compliant matte-tin plating, cathode marked on metal bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side metallization) | Transient current entry point | Connected to protected line (e.g., battery feed); conducts surge current into cathode |
| Cathode (metal base) | Current return path & thermal interface | Must be soldered to large copper pour or heatsink; serves dual role as electrical return and primary heat sink |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating | Validated for RTCA DO-160 Section 22 multi-stroke lightning - eliminates need for external spark gaps in avionics |
| 0.7 °C/W RθJC | Enables >10× higher thermal power handling vs. standard SMC packages - reduces heatsink size by ≥40% |
| Level 4 pin injection immunity | Withstands 6.4/69 μs waveform per DO-160F without degradation - certified for flight-critical sensor interfaces |
| e3 RoHS compliance | Matte-tin plating meets J-STD-020B Level 1 moisture sensitivity - no dry pack required for assembly |
| AEC-Q101 qualified | Surge-tested across wafer lots - ensures reliability in automotive 12 V/24 V ECU power rails |
Applications
| Aircraft Power Distribution Units | Automotive Engine Control Units |
|---|---|
Use Scenario: Protection of 28 V DC bus inputs against lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping TVS placed upstream of DC-DC converters and bus monitors. Use Value: Withstands ≥50 multi-stroke lightning events at 18 kW without parameter shift - extends system MTBF by 3× vs. legacy 5 kW TVS. |
Use Scenario: Load dump suppression on 12 V battery-fed microcontroller power rails during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS shunting 120 V/400 ms transients away from LDOs and CAN transceivers. Use Value: Clamps to 14.4 V within <100 ps - prevents brownout resets and preserves EEPROM integrity during ISO 7637-2 Pulse 5a events. |
| Industrial Motor Drive DC Links | Railway Signaling Power Supplies |
Use Scenario: Surge protection on 400 V DC link inputs exposed to switching transients from IGBT inverters. IC Role / Device Role / Timing Role: Secondary TVS stage after MOV-based front-end filtering, absorbing residual energy. Use Value: 1250 A IPP capability handles repetitive 10/1000 μs transients at 0.05% duty cycle - maintains clamping stability over 10⁵ cycles. |
Use Scenario: Protection of 110 V DC signaling power inputs against induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Bidirectional-capable family member (MPLAD18KP8.5CA) used for AC-coupled signal lines; this unidirectional variant secures DC bias rails. Use Value: Meets EN 50121-4 Class 3 immunity - passes 42 Ω IEC 61000-4-5 test up to Level 4 without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | Lower PPP (600 W), larger RθJA (50 °C/W), no RθJC spec, SMC package | Limited to single-stroke surges; unsuitable for DO-160 multi-stroke or repeated load dump | Select only for cost-sensitive consumer-grade 12 V inputs with infrequent transients |
| SMCJ8.5A | PPP = 1500 W, RθJC ≈ 2.5 °C/W, same SMC outline but higher power than SMBJ | Cannot meet DO-160 Level 4 pin injection or 18 kW multi-stroke requirements | Use where board space allows larger SMC footprint and 1.5 kW peak power suffices |
Compared with SMBJ8.5A and SMCJ8.5A, MPLAD18KP8.5AE3 delivers 30× higher peak power, 3.6× lower thermal resistance, and certified multi-stroke lightning endurance - making it the sole choice for aviation, rail, and high-reliability automotive power protection where failure is not an option.
Availability
MPLAD18KP8.5AE3 is available at Aetrix Electronics and suitable for aircraft power distribution units, automotive engine control units, and industrial motor drive DC links requiring stable component supply across extended production lifecycles and stringent environmental qualification.
Supply support for MPLAD18KP8.5AE3 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 - with emphasis on radiation-hardened, high-voltage, and surge-immune components.
The MPLAD series was developed specifically for high-power, low-thermal-resistance transient suppression in safety-critical platforms where DO-160, AEC-Q101, and IEC 61000-4-x compliance are mandatory - not general-purpose TVS replacement.
FAQ
What is the clamping voltage of MPLAD18KP8.5AE3 at its rated peak pulse current?
The MPLAD18KP8.5AE3 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak impulse current of 1250 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and lot variations per RF01215 Rev B specifications and ensures downstream 12 V logic and analog circuits remain within safe operating voltage limits during surge events.
Is MPLAD18KP8.5AE3 suitable for bidirectional signal line protection?
No, MPLAD18KP8.5AE3 is unidirectional and intended for DC-biased power rail protection only. For bidirectional AC or data-line protection, the companion part MPLAD18KP8.5CA (with CA suffix) must be used. Using MPLAD18KP8.5AE3 on bidirectional lines risks forward conduction during negative transients and potential device failure.
Does MPLAD18KP8.5AE3 require a heatsink for continuous operation?
While MPLAD18KP8.5AE3 can dissipate 2.5 W continuously at TA = 25°C without external heatsinking, its 0.7 °C/W RθJC rating is optimized for direct mounting to a metal heatsink or ≥2 oz copper plane. For sustained surge duty cycles or ambient temperatures above 70°C, a thermally coupled heatsink is required to maintain junction temperature below 150°C and ensure long-term reliability.
How does MPLAD18KP8.5AE3 meet RTCA DO-160 Section 22 lightning requirements?
MPLAD18KP8.5AE3 is validated for multi-stroke lightning per RTCA DO-160 Section 22 Waveform 4 (6.4/69 μs) Level 4 when mounted per the specified pad layout on FR4. Its 18,000 W PPP rating, sub-100 ps response time, and low RθJC enable it to absorb repeated 10/1000 μs surges without parameter drift - a requirement unmet by standard SMC/SMB TVS diodes.
What is the meaning of the 'E3' suffix in MPLAD18KP8.5AE3?
'E3' denotes RoHS-compliant matte-tin plating per IPC/JEDEC J-STD-020B Level 1 moisture sensitivity - confirming no dry pack is needed prior to reflow, and solderability meets MIL-STD-750 Method 2026. This suffix replaces legacy tin-lead plating and ensures compatibility with lead-free assembly processes while maintaining identical electrical and thermal performance as non-RoHS variants.
MPLAD18KP8.5AE3 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
MPLAD18KP8.5AE3 FAQ
1.How can I place an order for MPLAD18KP8.5AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP8.5AE3 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 MPLAD18KP8.5AE3 reliable?
The price and inventory of MPLAD18KP8.5AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP8.5AE3 is usually 5 days.
3.What payment methods are accepted for MPLAD18KP8.5AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP8.5AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP8.5AE3?
MPLAD18KP8.5AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP8.5AE3 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 MPLAD18KP8.5AE3?
For technical support, including MPLAD18KP8.5AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP8.5AE3 requirements.
6.How does Aetrix verify that MPLAD18KP8.5AE3 is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP8.5AE3 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 MPLAD18KP8.5AE3 meets industry standards.
7.What is the process for return or replacement of MPLAD18KP8.5AE3?
All MPLAD18KP8.5AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP8.5AE3, 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 MPLAD18KP8.5AE3 part is unused and in its original packaging.
Return procedure for MPLAD18KP8.5AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP8.5AE3 Tags
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