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Microchip Technology MAPLAD18KP33CAE3
- Part No.:
- MAPLAD18KP33CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP33CAE3.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,568
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Product details
Overview
MAPLAD18KP33CAE3 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 current, and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD18KP33CAE3 datasheet, MAPLAD18KP33CAE3 pinout, MAPLAD18KP33CAE3 application, or MAPLAD18KP33CAE3 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 Waveform 5A (Level 4), and ESD/EFT compliance per IEC 61000-4-2/4-4.
Technical Context
The MAPLAD18KP33CAE3 employs an avalanche breakdown structure optimized for low clamping ratio and fast response (<5 ns), enabling effective suppression of fast-rising transients such as lightning-induced surges and load dump events. Its bidirectional construction supports AC-coupled signal lines and differential bus protection without polarity constraints.
Thermal design leverages a metal-base package with 0.7 °C/W junction-to-case thermal resistance and low-profile void-free epoxy molding (UL94V-0), allowing direct mounting to heatsinks or copper planes for sustained energy dissipation. Standby leakage is limited to 10 μA at 33 V, supporting low-power system monitoring integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 18,000 W @ 10/1000 μs - enables single-device protection against severe lightning strikes and automotive load dump |
| Reverse Standoff Voltage (VWM) | 33 V - matches nominal 24 V DC systems with margin for ripple and tolerance |
| Clamping Voltage (VC) | 53.3 V max @ 338 A - ensures downstream ICs rated to 60 V remain within safe operating area |
| Breakdown Voltage (V(BR)) | 36.7–40.6 V @ I(BR) - defines precise conduction onset for predictable protection threshold |
| Thermal Resistance (RθJC) | 0.7 °C/W - allows efficient heat transfer to PCB copper or external heatsink for repeated surge handling |
| Leakage Current (ID) | 10 μA @ 33 V - minimizes standby power loss and avoids false triggering in high-impedance sensing circuits |
| Response Time | <5 ns - suppresses sub-microsecond transients before sensitive circuitry responds |
Pinout & Package
MAPLAD18KP33CAE3 uses a low-profile surface-mount plastic package with metal base (cathode side) and two solderable terminals. The package complies with UL94V-0, weighs ~1 g, and features tin-lead or RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Side) | Positive terminal for bidirectional operation | Connects to protected line; symmetric conduction enables AC or differential signal protection |
| Cathode (Metal Base) | Negative terminal / thermal path | Must be soldered to large copper pour or heatsink for thermal management and electrical return |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled buses (e.g., RS-485, CAN FD) without polarity-sensitive layout |
| RTCA DO-160F Waveform 4 & 5A compliance | Validated for Level 4 pin injection immunity (6.4/69 μs and 40/120 μs), critical for avionics I/O protection |
| MIL-PRF-19500 upscreening option | Supports high-reliability programs requiring lot traceability, 3σ ID screening, and conformance inspection |
| IEC 61000-4-5 secondary lightning protection | Qualified across 42 Ω, 12 Ω, and 2 Ω source impedances - covers Class 1–5 (42 Ω), Class 1–4 (12 Ω), and Class 2–3 (2 Ω) |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints per IPC/JEDEC J-STD-020B |
Applications
| Aerospace Avionics I/O Protection | Automotive Power Distribution |
|---|---|
Use Scenario: Protecting ARINC 429, MIL-STD-1553, or discrete sensor inputs on flight control computers from lightning-induced transients. IC Role / Device Role / Timing Role: Primary secondary surge clamp at board-level I/O interface, placed immediately after connector. Use Value: Meets RTCA DO-160 Section 22 multi-stroke lightning standard with no derating required at 25°C ambient. | Use Scenario: Safeguarding 24 V power distribution nodes in commercial vehicles during load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-energy TVS placed at fuse box or ECU input to absorb 18 kW surges without failure. Use Value: Clamps to 53.3 V while sustaining 338 A peak current - protects downstream DC-DC converters and microcontrollers. |
| Industrial Ethernet Switch Ports | Railway Signaling Interfaces |
Use Scenario: Shielding PoE-powered Ethernet PHY interfaces (IEEE 802.3af/at) from induced surges in factory-floor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pairs (e.g., TX+/TX−) to maintain signal integrity during EFT bursts. Use Value: Sub-5 ns response and 53.3 V clamping prevent latch-up in Gigabit PHYs while passing IEC 61000-4-4 Level 4. | Use Scenario: Securing 33 V signaling lines in European railway interlocking systems exposed to traction-induced surges. IC Role / Device Role / Timing Role: Secondary protector aligned with EN 50121-3-2 requirements for rolling stock EMC. Use Value: Validated for IEC 61000-4-5 with 42 Ω source impedance (Class 4) and 12 Ω (Class 3), ensuring interoperability with legacy infrastructure. |
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, SMC package - 30× lower peak power handling | Suitable only for low-energy ESD/EFT; cannot meet DO-160 Section 22 or ISO 7637-2 Pulse 5a | Select when cost and board space constrain use of high-power TVS, and surge threat level is limited to IEC 61000-4-2/4-4 |
| SMCJ33CA | 1500 W PPP rating, same VWM and polarity, larger SMC package - 12× lower energy capacity than MAPLAD18KP33CAE3 | Meets basic IEC 61000-4-5 Class 2 (42 Ω), but fails Class 3+ and DO-160 multi-stroke testing | Choose for industrial controls where full lightning immunity is not mandated, and thermal budget permits higher RθJA (35 °C/W vs. 0.7 °C/W) |
Compared with SMBJ33CA and SMCJ33CA, MAPLAD18KP33CAE3 provides 30× and 12× higher peak pulse power respectively, enabling single-device compliance with aviation-grade lightning standards and automotive load dump - eliminating cascaded protection stages and reducing BOM count.
Availability
MAPLAD18KP33CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive power electronics, and industrial rail signaling applications requiring stable component supply, long-term lifecycle support, and certified surge performance.
Supply support for MAPLAD18KP33CAE3 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 MAPLAD18KP33CAE3 belongs to the PLAD family of high-power surface-mount TVS diodes engineered specifically for multi-stroke lightning protection and harsh-environment surge immunity in safety-critical systems.
FAQ
What is the clamping voltage of MAPLAD18KP33CAE3 at its rated peak pulse current?
The MAPLAD18KP33CAE3 has a maximum clamping voltage (VC) of 53.3 V at 338 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value ensures protected circuits remain below 60 V absolute maximum ratings, preserving reliability of downstream 3.3 V/5 V/24 V logic and power ICs. The clamping performance is validated across temperature and production lots per RF01215 Rev B.
Does MAPLAD18KP33CAE3 meet RTCA DO-160 lightning test requirements?
Yes, MAPLAD18KP33CAE3 is explicitly qualified for RTCA DO-160 Section 22 multi-stroke lightning testing. Per RF01215 Rev B, it achieves Level 4 pin injection immunity for Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) at 25°C, and supports full multi-stroke compliance when mounted per recommended pad layout and thermal management guidelines.
What is the thermal resistance and how should MAPLAD18KP33CAE3 be mounted for optimal heat dissipation?
MAPLAD18KP33CAE3 has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. For optimal heat dissipation, the metal base (cathode) must be soldered directly to a minimum 10 cm² copper pour or external heatsink using the pad layout specified in RF01215 Rev B. This mounting method sustains repetitive surge duty cycles and prevents thermal runaway during multi-pulse events.
Is MAPLAD18KP33CAE3 RoHS compliant and what does the 'E3' suffix indicate?
Yes, MAPLAD18KP33CAE3 is RoHS compliant. The 'E3' suffix denotes annealed matte-tin plating per JEDEC/IPC standards, replacing lead-based terminations while maintaining solderability per MIL-STD-750 Method 2026. Moisture sensitivity is Level 1, eliminating dry-pack requirements and enabling standard SMT reflow processing without baking.
How does MAPLAD18KP33CAE3 differ from unidirectional variants like MAPLAD18KP33AE3?
MAPLAD18KP33CAE3 is bidirectional (indicated by 'CA'), enabling symmetrical clamping on AC or differential lines such as RS-485 or CAN, whereas MAPLAD18KP33AE3 is unidirectional ('A') and intended for DC-biased rails like 24 V power inputs. Both share identical PPP (18,000 W), VWM (33 V), and thermal specs, but polarity configuration determines circuit placement and protection topology.
MAPLAD18KP33CAE3 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
MAPLAD18KP33CAE3 FAQ
1.How can I place an order for MAPLAD18KP33CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP33CAE3 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 MAPLAD18KP33CAE3 reliable?
The price and inventory of MAPLAD18KP33CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP33CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP33CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP33CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP33CAE3?
MAPLAD18KP33CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP33CAE3 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 MAPLAD18KP33CAE3?
For technical support, including MAPLAD18KP33CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP33CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP33CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP33CAE3 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 MAPLAD18KP33CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP33CAE3?
All MAPLAD18KP33CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP33CAE3, 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 MAPLAD18KP33CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP33CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP33CAE3 Tags
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