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Microchip Technology MPLAD18KP33CAE3
- Part No.:
- MPLAD18KP33CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP33CAE3.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,825
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Product details
Overview
MPLAD18KP33CAE3 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 33 V reverse standoff voltage (VWM), clamps to ≤53.3 V at 338 A peak impulse current (IPP), and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MPLAD18KP33CAE3 datasheet, MPLAD18KP33CAE3 pinout, MPLAD18KP33CAE3 application, or MPLAD18KP33CAE3 equivalent, key selection criteria include bidirectional clamping capability, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 plating, MIL-PRF-19500 upscreening eligibility, and compliance with AEC-Q101 reliability testing.
Technical Context
This TVS diode employs an avalanche breakdown structure optimized for multi-stroke lightning transients per RTCA DO-160 Section 22 and repetitive surge events with ≤0.05% duty factor. Its metal-base package enables direct thermal coupling to heatsinks, supporting steady-state dissipation of 71 W at TC = 100°C.
The device operates bidirectionally with symmetrical clamping behavior, exhibits <5 ns response time, and maintains stable breakdown voltage (V(BR) = 36.7–40.6 V) across temperature with αV(BR) = 38 mV/°C. It is rated for junction temperatures from –55°C to +150°C and withstands solder reflow up to 260°C for 10 seconds.
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) | 33 V - maximum continuous operating 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 within spec |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink or PCB copper |
| Steady-State Power Dissipation | 71 W @ TC = 100°C - supports high-reliability operation under sustained thermal load |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack required; simplifies SMT handling and storage |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode/Cathode) with metal baseplate for thermal conduction. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Cathode terminal is the exposed metal base (bottom side); anode is top-side metallization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Top Metallization (Anode) | Anode connection | Solderable tin-plated surface for PCB trace routing; defines polarity in unidirectional variants |
| Metal Baseplate (Cathode) | Cathode connection | Primary thermal path and electrical return; must be soldered to large copper pour or heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables symmetric surge suppression on AC lines or floating buses without polarity constraints |
| 0.7 °C/W RθJC thermal resistance | Reduces junction temperature rise by >70% vs. standard SMD TVS, extending lifetime under repeated surges |
| RTCA DO-160F Waveform 4 & 5A compliance | Validated for Level 4 (6.4/69 μs) and Level 4 (40/120 μs) pin injection in avionics systems |
| AEC-Q101 qualified | Meets automotive-grade reliability requirements including HTOL, temperature cycling, and surge testing |
| e3 RoHS-compliant matte-tin plating | Ensures lead-free solder compatibility and long-term intermetallic stability per JEDEC J-STD-020B |
Applications
| Aerospace Avionics Power Bus Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting 28 V DC distribution networks in commercial aircraft against DO-160 Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Bidirectional TVS acting as primary clamping element across bus rails, triggered within <5 ns. Use Value: Enables compliance with Level 4 pin injection and Class 5 IEC 61000-4-5 (42 Ω source) without derating or parallel devices. |
Use Scenario: Safeguarding engine control units (ECUs) and body electronics during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-power transient suppressor placed at battery input, clamping 120 V/200 A spikes. Use Value: Absorbs full 18 kW surge energy in single device, eliminating need for stacked TVS arrays or hybrid solutions. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Interface Protection |
Use Scenario: Shielding IGBT gate drivers and sensors on 400 V DC link rails from switching-induced transients and EFT bursts. IC Role / Device Role / Timing Role: Secondary surge protector downstream of main DC bus filter, responding to fast-rising dv/dt events. Use Value: Clamps to 53.3 V at 338 A while maintaining <100 ps response-prevents false triggering of overvoltage lockouts. |
Use Scenario: Hardening 75 Ω data lines (e.g., RS-485, MVB) in train control systems against induced surges per EN 50121-4. IC Role / Device Role / Timing Role: Bidirectional line protector on differential signaling pairs, referenced to chassis ground via metal baseplate. Use Value: Provides Class 4 IEC 61000-4-5 immunity (12 Ω source) with no signal distortion due to low capacitance and symmetrical V-I curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ33CA | Lower PPP (400 W), smaller SMA package, RθJA = 50 °C/W, no metal baseplate | Restricted to low-energy consumer/industrial use; unsuitable for DO-160 or load dump | Select only for cost-sensitive, non-mission-critical 33 V rail protection where thermal mass is limited |
| Vishay V26MLA1812 | 18 kW multilayer varistor (MLV), bidirectional, but higher clamping (≈70 V), no AEC-Q101 or DO-160 validation | Lacks aviation qualification; used in telecom power supplies, not avionics or automotive ECUs | Consider only when lower-cost MLV behavior is acceptable and formal certification is not required |
Compared with SMAJ33CA and V26MLA1812, the MPLAD18KP33CAE3 uniquely combines aerospace-grade qualification, metal-base thermal performance, and verified 18 kW clamping in a single surface-mount device-enabling drop-in replacement in certified systems where reliability and test compliance are mandatory.
Availability
MPLAD18KP33CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU power inputs, and industrial motor drive DC links requiring stable component supply, long-lifecycle support, and certified surge protection performance.
Supply support for MPLAD18KP33CAE3 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MPLAD18KP33CAE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for mission-critical surge environments where multi-stroke lightning resilience, thermal robustness, and regulatory compliance are non-negotiable.
FAQ
What is the clamping voltage of the MPLAD18KP33CAE3 at its rated peak pulse current?
The MPLAD18KP33CAE3 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 guaranteed per the manufacturer's electrical characteristics table and ensures downstream circuitry remains below safe overvoltage thresholds during surge events.
Is the MPLAD18KP33CAE3 qualified for automotive applications?
Yes, the MPLAD18KP33CAE3 is AEC-Q101 qualified, having undergone stress testing including high-temperature operating life, temperature cycling, and surge robustness per automotive reliability standards. Its 33 V standoff and bidirectional clamping make it suitable for 24 V system load dump protection in ECUs and ADAS modules.
Does the MPLAD18KP33CAE3 require a heatsink for continuous operation?
The MPLAD18KP33CAE3 does not require an external heatsink for transient suppression, but its metal baseplate must be soldered to ≥25 cm² of 2 oz copper for optimal thermal performance. For steady-state power dissipation above 2.5 W, a heatsink is recommended-its RθJC of 0.7 °C/W enables 71 W dissipation only when case temperature is actively maintained at 100°C.
How does the "CA" suffix in MPLAD18KP33CAE3 indicate device functionality?
The "CA" suffix in MPLAD18KP33CAE3 explicitly denotes bidirectional construction, meaning the device provides symmetrical clamping for both positive and negative transients. This contrasts with "A"-suffixed variants (e.g., MPLAD18KP33AE3), which are unidirectional and conduct only in reverse bias-critical for AC-coupled or floating-bus protection schemes.
Can the MPLAD18KP33CAE3 be used in RTCA DO-160F Level 5 applications?
No-the MPLAD18KP33CAE3 is validated for RTCA DO-160F Level 4 pin injection (Waveform 4 and 5A) per the datasheet, but Level 5 requires higher energy handling beyond its specified rating. For Level 5, Microsemi recommends MPLAD18KP130CA or higher VWM variants, as confirmed in the "Pin injection protection" section of RF01215 Rev B.
MPLAD18KP33CAE3 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
MPLAD18KP33CAE3 FAQ
1.How can I place an order for MPLAD18KP33CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP33CAE3 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 MPLAD18KP33CAE3 reliable?
The price and inventory of MPLAD18KP33CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP33CAE3 is usually 5 days.
3.What payment methods are accepted for MPLAD18KP33CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP33CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP33CAE3?
MPLAD18KP33CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP33CAE3 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 MPLAD18KP33CAE3?
For technical support, including MPLAD18KP33CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP33CAE3 requirements.
6.How does Aetrix verify that MPLAD18KP33CAE3 is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP33CAE3 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 MPLAD18KP33CAE3 meets industry standards.
7.What is the process for return or replacement of MPLAD18KP33CAE3?
All MPLAD18KP33CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP33CAE3, 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 MPLAD18KP33CAE3 part is unused and in its original packaging.
Return procedure for MPLAD18KP33CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP33CAE3 Tags
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Diodes Incorporated
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