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Microchip Technology MAPLAD18KP33CA
- Part No.:
- MAPLAD18KP33CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP33CA.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,459
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Product details
Overview
MAPLAD18KP33CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial 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 engineers reviewing the MAPLAD18KP33CA datasheet, MAPLAD18KP33CA pinout, MAPLAD18KP33CA application, or MAPLAD18KP33CA equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), pin injection immunity per RTCA/DO-160F Waveform 4 Level 4, and ESD/EFT compliance per IEC 61000-4-2/4-4.
Technical Context
The MAPLAD18KP33CA employs an avalanche diode structure optimized for low clamping ratio and minimal thermal resistance. Its metal-base package enables direct heat sinking, achieving RθJC = 0.7 °C/W and supporting high-repetition-rate transients under ≤0.05% duty factor.
It operates bidirectionally with symmetrical breakdown (36.7–40.6 V @ I(BR)), maintains ≤10 μA standby current at VWM, and provides sub-5 ns response time to transients-critical for protecting sensitive avionics and power electronics against induced RFI and load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 33 V - matches nominal 28 V DC aircraft bus with margin for ripple and transients |
| Clamping Voltage (VC) | ≤53.3 V @ IPP = 338 A - limits downstream voltage stress to safe levels during surge |
| Breakdown Voltage (V(BR)) | 36.7–40.6 V @ I(BR) - ensures reliable conduction onset above operating voltage |
| Standby Current (ID) | ≤10 μA @ 33 V - negligible leakage in standby, preserving system efficiency |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables effective heat transfer to heatsink for repeated surge handling |
| Response Time | <5 ns - reacts before transient energy damages protected ICs or sensors |
Pinout & Package
MAPLAD18KP33CA uses a surface-mount PLAD package with metal base acting as cathode for unidirectional variants; for bidirectional MAPLAD18KP33CA, both terminals are symmetrical and non-polarized. The package measures 12.32 × 10.54 × 5.08 mm (L × W × H) with tin-plated terminations solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (symmetrical) | Bidirectional conduction path - no polarity marking required; connects to protected line |
| Terminal 2 | Anode / Cathode (symmetrical) | Second terminal of bidirectional TVS - mounts across differential or single-ended signal/power rail |
| Metal Base | Thermal Interface / Mechanical Anchor | Direct thermal path to PCB copper pour or heatsink; not electrically active in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer lot traceability | Full fabrication and assembly traceability supports aerospace DO-160 and MIL-PRF-19500 upscreening |
| RTCA DO-160F Waveform 4 Level 4 immunity | Withstands 6.4/69 μs pin-injection transients up to 33 V VWM devices without degradation |
| IEC 61000-4-5 secondary lightning protection | Validated at Class 1–4 with 42 Ω, 12 Ω, and 2 Ω source impedances - covers aircraft and vehicle harness coupling |
| Moisture Sensitivity Level 1 | No dry pack or baking required prior to reflow - simplifies SMT manufacturing flow |
| RoHS-compliant (e3) termination | Matte-tin plating compatible with lead-free and SnPb solder processes per J-STD-020B |
Applications
| Aerospace Avionics Power Bus Protection | Automotive 24 V Load Dump Suppression |
|---|---|
Use Scenario: Protecting flight control computers and sensor interfaces on 28 V DC aircraft buses exposed to lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Bidirectional TVS placed at board-level input to clamp common-mode and differential transients before they reach DC/DC converters and microcontrollers. Use Value: Enables compliance with multi-stroke lightning test requirements while maintaining <10 μA leakage to avoid battery drain in always-on systems. | Use Scenario: Safeguarding engine control units (ECUs) and ADAS modules during alternator load dump events in commercial trucks and off-highway vehicles. IC Role / Device Role / Timing Role: Primary surge shunt across 24 V supply rail, activated within <5 ns to limit voltage to ≤53.3 V during 100–200 V, 400 ms transients. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails downstream, eliminating need for oversized input capacitors or additional series impedance. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Interface Protection |
Use Scenario: Shielding gate drivers and current-sense amplifiers in variable-frequency drives from switching-induced transients on 30–40 V auxiliary rails. IC Role / Device Role / Timing Role: TVS mounted directly at DC link connector to absorb repetitive 18 kW pulses from IGBT commutation noise and contactor bounce. Use Value: Achieves RθJC = 0.7 °C/W thermal path to heatsinked PCB, enabling >1000 surge cycles at 0.05% duty factor without derating. | Use Scenario: Securing Ethernet and RS-485 communication ports in track-side signaling cabinets subjected to induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Bidirectional suppression element across data lines referenced to chassis ground, meeting EN 50121-4 immunity requirements. Use Value: Provides validated IEC 61000-4-5 Class 4 performance at 42 Ω source impedance - matching railway EMC test setup conditions. |
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, 33 V VWM, SMB package - 30× lower peak power than MAPLAD18KP33CA | Only suitable for low-energy ESD/EFT; cannot meet DO-160 lightning or load dump requirements | Select only for cost-sensitive consumer or non-safety-critical industrial designs where surge energy is <100 J |
| SMCJ33CA | 1500 W PPP rating, same VWM and polarity - 12× lower power handling than MAPLAD18KP33CA | Validated for IEC 61000-4-5 Class 3 (42 Ω), but fails Class 4 and DO-160F Waveform 4 Level 4 | Use when footprint constraints prevent PLAD mounting, but verify full system-level surge testing with actual waveforms |
Compared with SMBJ33CA and SMCJ33CA, MAPLAD18KP33CA delivers 30× and 12× higher peak pulse power respectively, enabling single-device compliance with RTCA DO-160F lightning standards and automotive load dump tests - eliminating cascaded TVS stages or external heatsinking.
Availability
MAPLAD18KP33CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU, industrial motor drive, and railway signaling applications requiring stable component supply, long-term lifecycle support, and certified surge immunity.
Supply support for MAPLAD18KP33CA 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 solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP33CA belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection and high-energy automotive transients - targeting systems where failure is not an option.
FAQ
What is the clamping voltage of MAPLAD18KP33CA at its rated peak pulse current?
The MAPLAD18KP33CA has a maximum clamping voltage (VC) of 53.3 V at 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 defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The clamping performance is critical for ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings.
Does MAPLAD18KP33CA require a heatsink for standard operation?
MAPLAD18KP33CA does not require an external heatsink for single-event surge suppression, but thermal management is essential for repetitive surges. Its RθJC of 0.7 °C/W enables direct mounting to a PCB copper pour or heatsink; for applications with >0.05% duty factor or frequent transients, a minimum 25 cm² 2 oz copper pad is recommended. Steady-state power dissipation is limited to 2.5 W at 25°C ambient, so continuous DC loading is not supported.
Is MAPLAD18KP33CA compliant with RoHS and REACH regulations?
Yes, MAPLAD18KP33CA is RoHS-compliant (e3 suffix denotes matte-tin plating) and conforms to REACH SVHC requirements. The device uses void-free UL94V-0 epoxy molding compound and annealed tin terminations, with no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE. Full material declarations and test reports are available upon request through Aetrix Electronics' compliance portal for MAPLAD18KP33CA.
Can MAPLAD18KP33CA be used in unidirectional configurations?
No - MAPLAD18KP33CA is strictly bidirectional, as indicated by the "CA" suffix in its part number. Unidirectional variants in the same family use "A" suffix (e.g., MPLAD18KP33A). Attempting to substitute MAPLAD18KP33CA in a unidirectional design may result in improper clamping behavior or failure to protect against negative-going transients. Always match polarity designation to circuit topology.
What is the moisture sensitivity level (MSL) for MAPLAD18KP33CA?
MAPLAD18KP33CA is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and requires no dry packing, baking, or special handling prior to reflow soldering. This eliminates moisture-related popcorning risk and simplifies SMT assembly - a key advantage for high-reliability aerospace and automotive production lines using MAPLAD18KP33CA.
MAPLAD18KP33CA 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
MAPLAD18KP33CA FAQ
1.How can I place an order for MAPLAD18KP33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP33CA 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 MAPLAD18KP33CA reliable?
The price and inventory of MAPLAD18KP33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP33CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP33CA?
MAPLAD18KP33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP33CA 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 MAPLAD18KP33CA?
For technical support, including MAPLAD18KP33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP33CA requirements.
6.How does Aetrix verify that MAPLAD18KP33CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP33CA 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 MAPLAD18KP33CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP33CA?
All MAPLAD18KP33CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP33CA, 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 MAPLAD18KP33CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP33CA Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
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
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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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