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Microchip Technology MXPLAD18KP33CAE3
- Part No.:
- MXPLAD18KP33CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MXPLAD18KP33CAE3.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,394
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Product details
Overview
MXPLAD18KP33CAE3 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, features a 33 V reverse standoff voltage (VWM), clamps to ≤53.3 V at 338 A peak impulse current (IPP), and meets RTCA DO-160 Section 22 multi-stroke lightning requirements for aircraft electronics.
For engineers reviewing the MXPLAD18KP33CAE3 datasheet, MXPLAD18KP33CAE3 pinout, MXPLAD18KP33CAE3 application, or MXPLAD18KP33CAE3 equivalent, key selection criteria include bidirectional polarity, 33 V working voltage, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 plating, and qualification per AEC-Q101 and MIL-PRF-19500 screening levels.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp transients within nanoseconds, with <5 ns response time for bidirectional operation. Its void-free thermosetting epoxy package and metal-base cathode construction enable direct thermal coupling to PCB copper, supporting high-reliability mounting on FR4 with recommended pad layout per RF01215 Rev B.
It is rated for secondary lightning protection per IEC 61000-4-5 at multiple source impedances (42 Ω, 12 Ω, 2 Ω) and provides pin injection immunity per RTCA/DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4), validated across -55°C to +150°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains multi-stroke lightning surges without degradation |
| Reverse Standoff Voltage (VWM) | 33 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Clamping Voltage (VC) | 53.3 V @ IPP = 338 A - limits downstream circuit voltage during worst-case surge |
| Breakdown Voltage (V(BR)) | 36.7–40.6 V @ I(BR) - ensures reliable avalanche conduction onset above VWM |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables efficient heat transfer from junction to case/mounting plane |
| Standby Current (ID) | 10 μA @ VWM - negligible leakage during normal operation, preserving system power budget |
| Temperature Range | -55°C to +150°C - supports deployment in engine bays, avionics bays, and industrial enclosures |
Pinout & Package
MXPLAD18KP33CAE3 uses a surface-mount plastic package with metal base cathode termination. The device has two terminals: anode and cathode, where the cathode is the exposed metal bottom surface of the package - requiring dedicated thermal pad connection to PCB ground plane for optimal thermal performance and surge dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive surge path input (bidirectional) | Connected to protected line; conducts during positive or negative transients relative to cathode |
| Cathode | Reference terminal / thermal interface | Exposed metal base - must be soldered to large copper area for thermal management and low-inductance return path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Protects AC-coupled or floating signal/power lines from ± transients without polarity constraints |
| Low RθJC (0.7 °C/W) | Enables >90% of 18 kW surge energy to be conducted into PCB copper, reducing junction temperature rise |
| AEC-Q101 qualified | Validated for automotive under-hood applications including load dump and alternator ripple immunity |
| RTCA DO-160F Level 4 compliance | Meets stringent airborne equipment surge immunity for Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) |
| e3 RoHS-compliant plating | Tin plating compatible with lead-free reflow profiles up to 260°C for 10 s, per J-STD-020B Level 1 |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 28 V DC bus inputs in flight control computers subjected to lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient shunt element placed at board edge before DC-DC converters and microcontrollers. Use Value: Clamps 18 kW surges to ≤53.3 V while maintaining <10 μA leakage, preventing latch-up or overvoltage damage to downstream ASICs. | Use Scenario: Load dump protection on 12 V battery-fed ECU power rails during alternator field collapse events. IC Role / Device Role / Timing Role: Bidirectional TVS placed between battery rail and ground, absorbing 100–200 ms transients up to 120 V. Use Value: Withstands 338 A peak current and dissipates 18 kW without failure, meeting ISO 7637-2 Pulse 5a requirements. |
| Railway Signaling Interface | Industrial Motor Drive I/O |
Use Scenario: Surge protection for Ethernet and RS-485 communication ports in trackside signaling units exposed to induced lightning. IC Role / Device Role / Timing Role: Secondary protection device after gas discharge tube (GDT), limiting let-through voltage to safe logic levels. Use Value: Responds in <5 ns to clamp fast-rising transients to ≤53.3 V, ensuring integrity of PHY-level data transmission. | Use Scenario: Protection of analog sensor inputs (e.g., current sense, temperature) in variable-frequency drives operating near high-di/dt motor switching noise. IC Role / Device Role / Timing Role: Localized TVS mounted directly at connector entry point to suppress EFT bursts and RFI coupling. Use Value: Suppresses ESD per IEC 61000-4-2 (±8 kV contact) and EFT per IEC 61000-4-4 (±2 kV), preserving ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | 600 W PPP rating, SMC package, RθJC ≈ 15 °C/W | Not suitable for multi-stroke lightning or 18 kW surges; limited to consumer-grade IEC 61000-4-5 Class 3 | Select only for cost-sensitive, non-aerospace applications with lower surge energy requirements. |
| SMCJ33CA | 1500 W PPP rating, larger SMC package, RθJC ≈ 4.5 °C/W | Lacks AEC-Q101 and DO-160 qualification; not rated for Level 4 pin injection or 42 Ω IEC 61000-4-5 | Acceptable for industrial controls with moderate surge exposure but insufficient for certified avionics or automotive safety systems. |
Compared with SMBJ33CA and SMCJ33CA, MXPLAD18KP33CAE3 delivers 30× higher peak pulse power, 10× lower thermal resistance, and full DO-160F/IEC 61000-4-5 certification - making it the only option for certified airborne and high-reliability automotive surge protection where single-event robustness and multi-stroke endurance are mandatory.
Availability
MXPLAD18KP33CAE3 is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU protection, railway signaling interfaces, and industrial motor drive I/O requiring stable component supply across extended product lifecycles.
Supply support for MXPLAD18KP33CAE3 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 analog, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.
The MPLAD family was engineered specifically for high-energy transient suppression in certified airborne and automotive systems, emphasizing thermal efficiency, multi-stroke endurance, and compliance with RTCA DO-160 and AEC-Q101 standards.
FAQ
What is the clamping voltage of MXPLAD18KP33CAE3 at its rated peak pulse current?
The MXPLAD18KP33CAE3 has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak impulse current (IPP) of 338 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 worst-case surge events. The MXPLAD18KP33CAE3 maintains this clamping performance across its full operating temperature range.
Is MXPLAD18KP33CAE3 qualified for automotive applications?
Yes, MXPLAD18KP33CAE3 is tested and qualified per AEC-Q101 for stress testing including HTRB, HTGB, and temperature cycling. Its 33 V standoff voltage, bidirectional capability, and 18,000 W surge rating make it suitable for automotive engine control units, battery management systems, and ADAS power supplies subject to load dump and jump-start transients. The MXPLAD18KP33CAE3 also supports optional MIL-PRF-19500 upscreening for enhanced reliability.
Does MXPLAD18KP33CAE3 require a heatsink for standard operation?
No external heatsink is required for MXPLAD18KP33CAE3 during transient suppression, as its 0.7 °C/W junction-to-case thermal resistance is designed for direct conduction into a PCB copper plane. The device relies on a minimum 1.0 cm² thermal pad connected to internal ground layers via ≥6 vias (per RF01215 Rev B pad layout). Steady-state power dissipation is limited to 2.5 W at 25°C ambient, so continuous DC loading is not intended - the MXPLAD18KP33CAE3 functions exclusively as a transient shunt.
What does the "CA" suffix indicate in MXPLAD18KP33CAE3?
The "CA" suffix in MXPLAD18KP33CAE3 denotes bidirectional polarity - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions relative to its terminals. This distinguishes it from unidirectional variants (e.g., MXPLAD18KP33AE3), which conduct only in one direction. The MXPLAD18KP33CAE3 is therefore appropriate for AC-coupled lines, differential buses, or floating power domains where polarity reversal may occur.
How does MXPLAD18KP33CAE3 meet RTCA DO-160 Section 22 lightning requirements?
MXPLAD18KP33CAE3 meets RTCA DO-160 Section 22 by sustaining ≥100 multi-stroke 18 kW surges at 10/1000 μs with <5% parameter shift, verified per test method in RF01215 Rev B. It achieves Level 4 pin injection immunity for Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs), and its low RθJC and metal-base construction minimize thermal accumulation across strokes. The MXPLAD18KP33CAE3 is explicitly listed in the DO-160F compliance table for 33 V devices.
MXPLAD18KP33CAE3 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 338A
- 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
MXPLAD18KP33CAE3 FAQ
1.How can I place an order for MXPLAD18KP33CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXPLAD18KP33CAE3 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 MXPLAD18KP33CAE3 reliable?
The price and inventory of MXPLAD18KP33CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXPLAD18KP33CAE3 is usually 5 days.
3.What payment methods are accepted for MXPLAD18KP33CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXPLAD18KP33CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXPLAD18KP33CAE3?
MXPLAD18KP33CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXPLAD18KP33CAE3 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 MXPLAD18KP33CAE3?
For technical support, including MXPLAD18KP33CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXPLAD18KP33CAE3 requirements.
6.How does Aetrix verify that MXPLAD18KP33CAE3 is sourced from the original manufacturer or authorized distributors?
All MXPLAD18KP33CAE3 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 MXPLAD18KP33CAE3 meets industry standards.
7.What is the process for return or replacement of MXPLAD18KP33CAE3?
All MXPLAD18KP33CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MXPLAD18KP33CAE3, 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 MXPLAD18KP33CAE3 part is unused and in its original packaging.
Return procedure for MXPLAD18KP33CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXPLAD18KP33CAE3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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