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Microchip Technology MAPLAD18KP8.5CAE3
- Part No.:
- MAPLAD18KP8.5CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP8.5CAE3.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,034
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Product details
Overview
MAPLAD18KP8.5CAE3 from Microsemi is a bidirectional 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, clamps to ≤14.4 V at 1250 A, and features a 8.5 V reverse standoff voltage (VWM), 9.44–10.4 V breakdown voltage (V(BR)), and 7.0 mV/°C temperature coefficient - enabling robust secondary lightning protection per IEC 61000-4-5 and RTCA DO-160F Waveform 4 Level 4.
For engineers reviewing the MAPLAD18KP8.5CAE3 datasheet, MAPLAD18KP8.5CAE3 pinout, MAPLAD18KP8.5CAE3 application, or MAPLAD18KP8.5CAE3 equivalent, key selection criteria include bidirectional polarity, 18 kW surge rating, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 plating, and qualification to AEC-Q101 and MIL-PRF-19500 screening levels.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device during transients, leveraging avalanche breakdown across its silicon junction to divert surge current away from protected circuitry. Its bidirectional construction enables symmetrical clamping for AC-coupled or floating signal lines, and its low RθJC ensures effective heat transfer to the PCB copper plane or heatsink under repetitive surge conditions.
The device meets stringent aerospace requirements including RTCA DO-160F Section 22 multi-stroke lightning testing and pin-injection immunity for Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs). It supports secondary lightning protection classes up to IEC 61000-4-5 Class 5 with 42 Ω source impedance and Class 4 with 2 Ω source impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without failure under standard lightning waveform |
| Reverse Standoff Voltage (VWM) | 8.5 V - maximum continuous operating voltage before conduction begins; sets minimum system operating margin |
| Clamping Voltage (VC) | ≤14.4 V @ IPP = 1250 A - limits downstream voltage stress during worst-case surge event |
| Breakdown Voltage (V(BR)) | 9.44–10.4 V @ I(BR) - defines precise avalanche onset range for predictable turn-on behavior |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables efficient junction-to-case heat transfer to PCB copper or heatsink |
| Temperature Coefficient (αV(BR)) | +7.0 mV/°C - quantifies V(BR) drift over temperature; critical for design margining across -55°C to +150°C |
| Surge Current (IPP) | 1250 A @ 10/1000 μs - peak current handled at rated clamping voltage; determines PCB trace sizing and layout |
Pinout & Package
MAPLAD18KP8.5CAE3 uses a surface-mount PLAD package with two terminals: anode and cathode. The metal base serves as the cathode terminal (per datasheet note: "The cathode is the metal base under the body of this device"), enabling direct thermal coupling to PCB ground plane. Package dimensions are 12.32 × 10.54 × 5.08 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary thermal path and current return node; must be soldered to large copper pour for thermal management |
| Top Surface Pad | Anode | Signal-side connection point; routed to line being protected; requires minimal trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetric protection of AC signals, differential buses, or ungrounded interfaces without polarity constraints |
| 18 kW peak pulse rating | Meets RTCA DO-160F Section 22 multi-stroke lightning requirements for aircraft avionics and flight control systems |
| AEC-Q101 qualified | Validated for automotive load dump and ISO 7637-2 compliance in engine control, ADAS, and infotainment modules |
| e3 RoHS-compliant plating | Matte-tin termination compatible with lead-free reflow profiles and IPC/JEDEC J-STD-020B Level 1 moisture sensitivity |
| 0.7 °C/W RθJC | Supports >10× higher steady-state power dissipation than standard SMC packages when mounted on 2 oz copper |
Applications
| Aircraft Avionics Power Input | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 28 V DC power inputs in flight management computers against lightning-induced surges per RTCA DO-160F Section 22. IC Role / Device Role / Timing Role: Primary transient shunt device placed at board edge before EMI filter and DC-DC converter input. Use Value: Clamps transients to ≤14.4 V while handling 1250 A pulses, preventing latch-up or damage to downstream PMICs and microcontrollers. | Use Scenario: Load dump suppression on 12 V battery-fed circuits in gasoline/diesel ECUs during alternator field decay events. IC Role / Device Role / Timing Role: High-energy crowbar element parallel to input capacitor, activated within <100 ps of overvoltage onset. Use Value: Absorbs 18 kW surge energy without degradation, maintaining system uptime and meeting ISO 16750-2 Pulse 5b requirements. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Protection of 48 V DC bus in variable-frequency drives against switching transients from IGBT commutation and regenerative braking. IC Role / Device Role / Timing Role: Bidirectional clamp across bus rails to suppress both positive and negative polarity spikes induced by fast dV/dt. Use Value: Symmetric 14.4 V clamping prevents gate driver overvoltage and MOSFET avalanche failure during repeated 10/1000 μs surges. | Use Scenario: Secondary surge protection on 72 V signaling lines in European railway interlocking systems compliant with EN 50121-4. IC Role / Device Role / Timing Role: Final-stage protector after gas discharge tube (GDT) primary stage, limiting residual let-through voltage. Use Value: Reduces clamped voltage to safe levels (<15 V) for RS-485 transceivers and FPGA I/O banks, ensuring EMC immunity certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA | 600 W PPP rating, SMB package, RθJC ≈ 15 °C/W | Limited to single-stroke or low-duty-cycle surges; unsuitable for DO-160F multi-stroke testing | Select only for cost-sensitive industrial controls where 18 kW rating is not required |
| SMCJ8.5CA | 1500 W PPP rating, SMC package, RθJC ≈ 3.5 °C/W | Cannot sustain repeated 1250 A surges; derates significantly above 75°C ambient | Acceptable for automotive infotainment but not for safety-critical ECU or avionics power rails |
Compared with SMBJ8.5CA and SMCJ8.5CA, MAPLAD18KP8.5CAE3 provides 30× higher peak pulse power and 5× lower thermal resistance - making it the only option capable of meeting RTCA DO-160F Section 22 multi-stroke lightning and IEC 61000-4-5 Class 5 requirements in high-reliability platforms.
Availability
MAPLAD18KP8.5CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive powertrain electronics, and industrial motor drive systems requiring stable component supply across extended product lifecycles and rigorous environmental qualification.
Supply support for MAPLAD18KP8.5CAE3 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 MAPLAD18KP8.5CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection and automotive load dump compliance in mission-critical power and signal interfaces.
FAQ
What is the clamping voltage of MAPLAD18KP8.5CAE3 at its rated peak pulse current?
The MAPLAD18KP8.5CAE3 has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPP) of 1250 A under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and Table on page 4, and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MAPLAD18KP8.5CAE3 maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is MAPLAD18KP8.5CAE3 qualified for automotive applications?
Yes, MAPLAD18KP8.5CAE3 is qualified to AEC-Q101 for automotive use and is explicitly rated for load dump protection per ISO 7637-2. Its 18,000 W peak pulse power, 1250 A surge current capability, and bidirectional construction make it suitable for engine control units, transmission control modules, and ADAS power inputs. The MAPLAD18KP8.5CAE3 also supports optional MIL-PRF-19500 upscreening for enhanced reliability in safety-critical vehicle systems.
How does the PLAD package of MAPLAD18KP8.5CAE3 improve thermal performance compared to standard SMC or SMB packages?
The PLAD package of MAPLAD18KP8.5CAE3 achieves a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W - over 20× lower than typical SMC packages (~15 °C/W) and ~5× lower than high-power SMB variants. This is enabled by its metal-base cathode construction, which provides direct thermal conduction to the PCB copper plane. As a result, MAPLAD18KP8.5CAE3 sustains higher average power and survives repetitive surges without thermal runaway, unlike smaller packages that rely on less efficient plastic-body conduction paths.
Does MAPLAD18KP8.5CAE3 meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP8.5CAE3 is specifically designed and tested to meet RTCA DO-160F Section 22 multi-stroke lightning standards for aircraft systems. It supports Level 4 pin injection protection for Waveform 4 (6.4/69 μs) and Level 4 for Waveform 5A (40/120 μs), as confirmed in the RF01215 datasheet. The MAPLAD18KP8.5CAE3's 18 kW rating, low clamping voltage, and bidirectional symmetry ensure compliance across all applicable waveforms and test configurations defined in DO-160F.
What is the meaning of the 'CA' and 'E3' suffixes in MAPLAD18KP8.5CAE3?
The 'CA' suffix in MAPLAD18KP8.5CAE3 indicates bidirectional polarity (as opposed to 'A' for unidirectional), enabling symmetrical clamping for AC or floating interfaces. The 'E3' suffix denotes RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity - eliminating dry-pack requirements and supporting standard lead-free reflow profiles. Together, these suffixes define the device's electrical configuration and environmental compliance, both verified in the MAPLAD18KP8.5CAE3 manufacturing lot traceability records.
MAPLAD18KP8.5CAE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 1250A (1.25kA)
- 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
MAPLAD18KP8.5CAE3 FAQ
1.How can I place an order for MAPLAD18KP8.5CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP8.5CAE3 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 MAPLAD18KP8.5CAE3 reliable?
The price and inventory of MAPLAD18KP8.5CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP8.5CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP8.5CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP8.5CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP8.5CAE3?
MAPLAD18KP8.5CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP8.5CAE3 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 MAPLAD18KP8.5CAE3?
For technical support, including MAPLAD18KP8.5CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP8.5CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP8.5CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP8.5CAE3 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 MAPLAD18KP8.5CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP8.5CAE3?
All MAPLAD18KP8.5CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP8.5CAE3, 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 MAPLAD18KP8.5CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP8.5CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP8.5CAE3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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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
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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