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Microchip Technology MPLAD18KP45CAE3
- Part No.:
- MPLAD18KP45CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP45CAE3.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,832
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Product details
Overview
MPLAD18KP45CAE3 from Microsemi is a bidirectional 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 45 V reverse standoff voltage (VWM), clamps to ≤72.7 V at 248 A peak impulse current (IPP), and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MPLAD18KP45CAE3 datasheet, MPLAD18KP45CAE3 pinout, MPLAD18KP45CAE3 application, or MPLAD18KP45CAE3 equivalent, key selection criteria include its bidirectional polarity, 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant matte-tin plating, 1 g mass, and compatibility with FR4 PCB mounting per recommended pad layout - all critical for high-reliability transient suppression in avionics and load-dump environments.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating when transient voltage exceeds its 45 V working standoff level. Its silicon avalanche structure ensures sub-5 ns response time and low clamping ratio (VC/VWM ≈ 1.62), enabling effective suppression of lightning-induced surges, EFT bursts, and automotive load dump transients.
It is qualified to AEC-Q101 and supports MIL-PRF-19500 upscreening options (M/MA/MXL levels). Thermal performance is optimized via metal-base cathode construction and low RθJC (0.7 °C/W), allowing efficient heat transfer to heatsink-mounted PCB pads - essential for multi-stroke compliance per RTCA DO-160 Section 22.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 45 V - maximum continuous operating voltage before clamping initiates |
| Clamping Voltage (VC) | ≤72.7 V @ IPP = 248 A - limits downstream voltage stress during worst-case surge |
| Peak Impulse Current (IPP) | 248 A @ 10/1000 μs - quantifies maximum surge current it safely diverts |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct thermal coupling to heatsinked PCB for cumulative stroke handling |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack required; simplifies SMT assembly logistics |
| RoHS Compliance | e3 suffix - matte-tin plating meets EU RoHS Directive 2011/65/EU |
Pinout & Package
Package: Surface-mount DO-214AB (SMC) with metal base cathode; void-free UL94V-0 epoxy body; dimensions 11.94 × 5.85 × 2.44 mm (L×W×H); weight ≈1 g; polarity marked by cathode on metal bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top metallization) | Transient current entry point (bidirectional) | Accepts surge polarity in either direction; symmetric conduction path |
| Cathode (metal base) | Transient current return path & thermal interface | Serves as primary heat sink contact; must be soldered to large copper pour or heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC lines or floating DC buses without polarity constraints |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges up to 400 V at 25°C - validated for avionics I/O protection |
| IEC 61000-4-5 Class 1–5 secondary lightning protection | Validated at 42 Ω, 12 Ω, and 2 Ω source impedances - covers full range of system-level surge test configurations |
| Low RθJC (0.7 °C/W) | Supports >1000 repetitive 10/1000 μs surges at 0.05% duty cycle without thermal runaway |
| AEC-Q101 qualification | Meets automotive-grade reliability for under-hood and battery-system applications |
Applications
| Avionics Power Distribution | Automotive Battery Management |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in flight control computers against DO-160 Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy to chassis ground. Use Value: Ensures <100 ps response and ≤72.7 V clamping preserves integrity of downstream DC-DC converters rated for 40 V max input. | Use Scenario: Safeguarding BMS microcontroller supply rails during 12 V automotive load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary overvoltage clamp across main 12 V rail, mounted with thermal pad to inner ground plane. Use Value: Absorbs 18 kW surge energy while maintaining VWM = 45 V margin above nominal 13.5 V battery voltage. |
| Industrial Motor Drive Inputs | Railway Signaling Interfaces |
Use Scenario: Shielding PLC analog input modules from inductive kickback and EFT noise on 24 V sensor lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed per-channel at terminal block entry, before signal conditioning circuitry. Use Value: Clamps EFT bursts (IEC 61000-4-4) to <72.7 V within 5 ns, preventing ADC saturation and false triggering. | Use Scenario: Protecting Ethernet PHY interfaces in wayside signaling units exposed to traction current surges and lightning coupling. IC Role / Device Role / Timing Role: Line-to-ground TVS on RJ45 magnetics secondary side, leveraging bidirectional symmetry for differential pair protection. Use Value: Meets EN 50121-4 immunity requirements for 2 kV common-mode surge with minimal capacitance impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA | 600 W PPP rating, 5.0 mm × 4.6 mm 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 capability is unnecessary |
| SMCJ45CA | 1500 W PPP rating, same SMC package but lower energy capacity; clamps at 73.5 V @ 171 A | Meets basic IEC 61000-4-5 Class 3 but not Class 4/5 or DO-160F Level 4/5 | Use where space-constrained designs require SMC footprint but full 18 kW rating is not mandated |
Compared with SMBJ45CA and SMCJ45CA, the MPLAD18KP45CAE3 provides 30× and 12× higher peak pulse power respectively, enabling certified multi-stroke lightning resilience in safety-critical platforms where thermal robustness and regulatory compliance are non-negotiable.
Availability
MPLAD18KP45CAE3 is available at Aetrix Electronics and suitable for avionics power distribution, automotive battery management, and industrial motor drive inputs requiring stable component supply across extended production lifecycles.
Supply support for MPLAD18KP45CAE3 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, radiation-tolerant, and aerospace-grade components.
The MPLAD18KP45CAE3 belongs to Microsemi's PLAD high-power TVS family, engineered specifically for certified lightning and load-dump protection in mission-critical transportation and defense systems.
FAQ
What is the clamping voltage of MPLAD18KP45CAE3 at its rated peak impulse current?
The MPLAD18KP45CAE3 has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak impulse current of 248 A 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 surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is MPLAD18KP45CAE3 qualified for automotive applications?
Yes, MPLAD18KP45CAE3 is qualified to AEC-Q101 for discrete semiconductors, confirming its suitability for automotive under-hood and battery-system applications. Its 45 V VWM and 18 kW surge rating align with ISO 7637-2 Pulse 5a load dump requirements, and its thermal design supports sustained operation in 105°C ambient environments typical of engine compartments.
Does MPLAD18KP45CAE3 meet RTCA DO-160F lightning protection standards?
Yes, MPLAD18KP45CAE3 is explicitly validated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 per RF01215 Rev B. Its bidirectional construction and 18 kW rating enable compliance with multi-stroke lightning testing protocols required for commercial and military avionics installations.
What is the thermal resistance from junction to case for MPLAD18KP45CAE3?
The junction-to-case thermal resistance (RθJC) of MPLAD18KP45CAE3 is 0.7 °C/W, as specified in the "MAXIMUM RATINGS" table of RF01215 Rev B. This low value results from its metal-base cathode construction and enables efficient heat transfer to PCB copper pours or external heatsinks - a key enabler for repeated surge handling without thermal degradation.
How is polarity identified on MPLAD18KP45CAE3?
On MPLAD18KP45CAE3, polarity is defined by physical construction: the cathode is the metal base (bottom surface) of the device, while the anode is the top metallized surface. This is consistent across all CA-suffix bidirectional variants in the PLAD family and is documented in the "MECHANICAL and PACKAGING" section of RF01215 Rev B - critical for correct PCB pad layout and thermal interface design.
MPLAD18KP45CAE3 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 248A
- 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
MPLAD18KP45CAE3 FAQ
1.How can I place an order for MPLAD18KP45CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP45CAE3 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 MPLAD18KP45CAE3 reliable?
The price and inventory of MPLAD18KP45CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP45CAE3 is usually 5 days.
3.What payment methods are accepted for MPLAD18KP45CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP45CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP45CAE3?
MPLAD18KP45CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP45CAE3 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 MPLAD18KP45CAE3?
For technical support, including MPLAD18KP45CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP45CAE3 requirements.
6.How does Aetrix verify that MPLAD18KP45CAE3 is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP45CAE3 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 MPLAD18KP45CAE3 meets industry standards.
7.What is the process for return or replacement of MPLAD18KP45CAE3?
All MPLAD18KP45CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP45CAE3, 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 MPLAD18KP45CAE3 part is unused and in its original packaging.
Return procedure for MPLAD18KP45CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP45CAE3 Tags
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