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Microchip Technology MAPLAD18KP8.5AE3
- Part No.:
- MAPLAD18KP8.5AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP8.5AE3.pdf
- Description:
- TVS DIODE 85VWM 137VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,487
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Product details
Overview
MAPLAD18KP8.5AE3 from Microsemi is a unidirectional 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 8.5 V reverse standoff voltage (VWM), clamps to ≤14.4 V at 1250 A IPP, and exhibits 0.7 °C/W junction-to-case thermal resistance. It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 for pin injection protection.
For engineers reviewing the MAPLAD18KP8.5AE3 datasheet, MAPLAD18KP8.5AE3 pinout, MAPLAD18KP8.5AE3 application, or MAPLAD18KP8.5AE3 equivalent, key selection criteria include its 8.5 V VWM rating, 14.4 V max clamping voltage at 1250 A, RoHS-compliant e3 plating, MIL-PRF-19500 upscreening capability, and compliance with IEC 61000-4-5 (42 Ω, 12 Ω, 2 Ω source impedances) for secondary lightning protection.
Technical Context
This TVS diode employs an avalanche breakdown mechanism to clamp transient overvoltages within nanoseconds. Its low RθJC (0.7 °C/W) enables effective heat transfer to a heatsink or PCB copper plane, supporting sustained multi-stroke surge handling per RTCA DO-160 Section 22. The device uses a void-free UL94V-0 epoxy package with tin-lead or matte-tin (e3) terminations solderable per MIL-STD-750 Method 2026.
It is rated for -55°C to +150°C operating temperature, supports 3σ lot norm screening on standby current (ID), and provides ESD/EFT protection per IEC 61000-4-2/4-4. Pin polarity is defined by cathode on the metal base - critical for correct PCB layout orientation in unidirectional configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous DC or RMS operating voltage before clamping initiates |
| V(BR) min/max | 9.44–10.4 V @ I(BR) - Ensures reliable avalanche conduction onset across process variation |
| VC @ IPP | ≤14.4 V @ 1250 A - Limits downstream circuit stress during 10/1000 μs transients |
| PPP | 18,000 W @ 10/1000 μs - Sustains aircraft-grade lightning surge energy without failure |
| RθJC | 0.7 °C/W - Enables direct thermal coupling to heatsink or large copper pour for thermal management |
| ID @ VWM | 150 μA max - Minimizes leakage impact on low-power sensor or control circuits |
| αV(BR) | 7.0 mV/°C - Predictable voltage drift over temperature for stable clamping margin design |
Pinout & Package
The MAPLAD18KP8.5AE3 uses a surface-mount plastic package with metal base cathode termination. Package dimensions: 12.32–12.57 mm (L) × 10.54–10.80 mm (W) × 3.68–3.94 mm (H); recommended pad layout provided in RF01215 Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface metallization) | Transient current entry point during positive surges | Connected to protected line; must be routed with low-inductance trace |
| Cathode (metal base / bottom surface) | Current return path and primary thermal interface | Must be soldered to large copper area or heatsink for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse power rating | Meets RTCA DO-160 Section 22 multi-stroke lightning requirements for avionics |
| Low-profile surface-mount package | Enables high-density PCB layouts while maintaining mechanical robustness in vibration-prone environments |
| RoHS-compliant e3 matte-tin plating | Ensures lead-free assembly compatibility and long-term solder joint reliability per IPC/JEDEC J-STD-020B Level 1 |
| AEC-Q101 qualification | Validates reliability for automotive load-dump and battery-transient protection applications |
| Wafer and assembly lot traceability | Supports full supply chain auditability required for aerospace and defense programs |
Applications
| Aerospace Avionics Protection | Automotive Power Distribution |
|---|---|
Use Scenario: Protecting ARINC 429 data lines and sensor inputs in commercial aircraft against DO-160F Waveform 4 (6.4/69 μs) lightning-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS acting as first-line clamping element upstream of signal conditioning ICs. Use Value: Clamps to ≤14.4 V at 1250 A, preserving integrity of 3.3 V/5 V logic interfaces without requiring series impedance. | Use Scenario: Safeguarding engine control unit (ECU) power rails during ISO 7637-2 load dump events (up to 120 V, 400 ms). IC Role / Device Role / Timing Role: High-energy transient suppressor placed at main 12 V input connector to absorb >100 J surges. Use Value: 18,000 W PPP rating sustains repeated load dump pulses without parametric shift or catastrophic failure. |
| Industrial Motor Drive Control | Railway Signaling Interface |
Use Scenario: Shielding PLC analog I/O modules from switching transients induced by VFDs and contactor coil de-energization. IC Role / Device Role / Timing Role: Standoff-voltage-matched TVS on 24 V DC supply rail to prevent latch-up in op-amps and ADCs. Use Value: 8.5 V VWM aligns with 24 V system derated minimum; 150 μA ID avoids loading precision reference circuits. | Use Scenario: Protecting track-side signaling electronics from induced surges due to nearby lightning strikes per EN 50121-4. IC Role / Device Role / Timing Role: Secondary lightning protector on 48 V DC telemetry lines interfacing with centralized control systems. Use Value: Certified for IEC 61000-4-5 Class 4 (42 Ω source) ensures interoperability with railway EMC test plans. |
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 | 600 W PPP rating, SMB package, RθJC ≈ 25 °C/W | Limited to single-stroke or low-duty-cycle surges; unsuitable for DO-160 multi-stroke validation | Select only for cost-sensitive industrial controls where 18 kW surge immunity is not required |
| SMCJ8.5A | 1500 W PPP rating, SMC package, RθJC ≈ 10 °C/W | Cannot meet RTCA DO-160F Level 4 pin injection or IEC 61000-4-5 Class 4 without parallel staging | Acceptable for automotive infotainment power rails but requires thermal derating above 75°C ambient |
Compared with SMBJ8.5A and SMCJ8.5A, MAPLAD18KP8.5AE3 delivers 30× and 12× higher peak pulse power respectively, with superior thermal resistance enabling direct mounting to heatsinks - making it uniquely suitable for certified aerospace and high-reliability automotive surge protection where single-device robustness is mandatory.
Availability
MAPLAD18KP8.5AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU power protection, and industrial motor drive control requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP8.5AE3 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 semiconductor solutions for aerospace, defense, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and surge protection components.
The MAPLAD18KP8.5AE3 belongs to Microsemi's high-power PLAD family, engineered specifically for certified lightning and load-dump protection in safety-critical systems where multi-stroke survivability and thermal stability are non-negotiable.
FAQ
What is the maximum clamping voltage of MAPLAD18KP8.5AE3 under standard 10/1000 μs surge conditions?
The MAPLAD18KP8.5AE3 has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 1250 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and process variation, ensuring predictable overvoltage limiting for downstream 5 V or 3.3 V circuitry. The clamping occurs within <100 ps of transient onset, minimizing voltage overshoot exposure.
Is MAPLAD18KP8.5AE3 compliant with RoHS and qualified for automotive use?
Yes, MAPLAD18KP8.5AE3 carries the "e3" suffix indicating RoHS-compliant matte-tin plating, and it is fully qualified to AEC-Q101 for automotive applications. Its construction, surge testing, and lot traceability meet requirements for engine control units, battery management systems, and ADAS power supplies exposed to load dump and jump-start transients.
How does the thermal performance of MAPLAD18KP8.5AE3 compare to standard SMC/SMB TVS diodes?
MAPLAD18KP8.5AE3 achieves a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W - over 10× lower than typical SMC (≈10 °C/W) or SMB (≈25 °C/W) packages. This allows direct thermal coupling to PCB copper or external heatsinks, enabling sustained multi-pulse operation without thermal runaway, unlike smaller-footprint alternatives that require significant derating above 75°C.
Can MAPLAD18KP8.5AE3 be used for bidirectional surge protection?
No - MAPLAD18KP8.5AE3 is a unidirectional TVS diode, as indicated by the "A" suffix (versus "CA" for bidirectional). Its cathode is the metal base, and it conducts only during reverse-biased overvoltage events. For AC or bipolar signal line protection, the bidirectional variant MAPLAD18KP8.5CA must be selected instead.
What packaging options are available for MAPLAD18KP8.5AE3?
MAPLAD18KP8.5AE3 is supplied in bulk or tape-and-reel format. Tape-and-reel packaging follows EIA-481-B standards; add the "TR" suffix (e.g., MAPLAD18KP8.5AE3TR) when ordering. Custom reel quantities and moisture-sensitive packaging per IPC/JEDEC J-STD-020B Level 1 (no dry pack required) are supported for high-volume production releases.
MAPLAD18KP8.5AE3 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
MAPLAD18KP8.5AE3 FAQ
1.How can I place an order for MAPLAD18KP8.5AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP8.5AE3 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 MAPLAD18KP8.5AE3 reliable?
The price and inventory of MAPLAD18KP8.5AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP8.5AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP8.5AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP8.5AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP8.5AE3?
MAPLAD18KP8.5AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP8.5AE3 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 MAPLAD18KP8.5AE3?
For technical support, including MAPLAD18KP8.5AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP8.5AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP8.5AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP8.5AE3 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 MAPLAD18KP8.5AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP8.5AE3?
All MAPLAD18KP8.5AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP8.5AE3, 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 MAPLAD18KP8.5AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP8.5AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP8.5AE3 Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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