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Microchip Technology MAPLAD18KP22CAE3
- Part No.:
- MAPLAD18KP22CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP22CAE3.pdf
- Description:
- TVS DIODE 22VWM 35.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,219
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Product details
Overview
MAPLAD18KP22CAE3 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 22 V reverse standoff voltage (VWM), clamps to ≤35.5 V at 508 A peak pulse current (IPP), and meets RTCA DO-160 Section 22 multi-stroke lightning requirements. It is used in aircraft avionics power inputs and engine control units for secondary lightning and EFT/ESD protection.
For engineers reviewing the MAPLAD18KP22CAE3 datasheet, MAPLAD18KP22CAE3 pinout, MAPLAD18KP22CAE3 application, or MAPLAD18KP22CAE3 equivalent, key selection criteria include its bidirectional polarity, 22 V VWM rating, 35.5 V max clamping voltage at 508 A, compliance with IEC 61000-4-5 (42 Ω, 12 Ω, 2 Ω source impedances), and RTCA/DO-160F Waveform 4 Level 4 qualification up to 200 V devices.
Technical Context
This TVS diode employs an avalanche breakdown structure optimized for low clamping ratio and minimal thermal resistance. Its metal-base package enables direct heat sinking, achieving 0.7 °C/W junction-to-case thermal resistance and supporting high-repetition surges under 0.05% duty factor.
It is characterized for bidirectional operation with symmetrical breakdown (24.4–26.9 V @ I(BR)), 5 μA max standby current at 22 V, and <5 ns response time. Compliance includes IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and RTCA/DO-160F Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) pin injection testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous operating voltage before clamping begins; matches 24 V nominal DC bus systems with margin. |
| V(BR) min/max | 24.4–26.9 V @ I(BR) - Ensures reliable avalanche conduction onset across temperature and lot variation. |
| VC @ IPP | ≤35.5 V @ 508 A - Limits downstream voltage stress during 10/1000 μs transients to protect 36 V-rated ICs. |
| PPP | 18,000 W @ 10/1000 μs - Sustains single-stroke lightning-level energy without failure per DO-160 Section 22. |
| ID @ VWM | ≤10 μA - Negligible leakage at rated standoff, preserving system efficiency and battery life in always-on circuits. |
| RθJC | 0.7 °C/W - Enables effective thermal coupling to PCB copper or external heatsink for repeated surge handling. |
| Package | PLAD - Surface-mount, low-profile thermoset epoxy case with metal base; RoHS-compliant matte-tin terminations. |
Pinout & Package
The MAPLAD18KP22CAE3 uses a 2-terminal PLAD package with the cathode and anode formed on opposite sides of the metal base. The metal base serves as one terminal (cathode for unidirectional, common terminal for bidirectional), while the top-side metallization forms the second terminal. Polarity marking is absent; orientation is defined by mechanical mounting - the metal base must be soldered to a thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base | Common Terminal (Bidirectional) | Serves as both anode and cathode connection point; requires full-surface soldering to thermal pad for optimal RθJC and surge current path. |
| Top-Side Metallization | Common Terminal (Bidirectional) | Second electrical interface; completes bidirectional conduction path; must be routed with low-inductance trace for fast transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional construction | Enables symmetric clamping for AC-coupled or floating-bus applications without polarity sensitivity. |
| 18 kW peak pulse power | Meets RTCA DO-160 Section 22 multi-stroke lightning test requirements for commercial aircraft systems. |
| 0.7 °C/W RθJC | Supports >100 surge events at 0.05% duty cycle when mounted on ≥1 in² 2-oz copper with thermal vias. |
| IEC 61000-4-5 compliance (42/12/2 Ω) | Validated for Class 1–5 secondary lightning protection across multiple source impedances in industrial and transport systems. |
| RTCA/DO-160F Waveform 4 Level 4 | Qualified for pin-injection immunity up to 200 V standoff devices, enabling use in flight-critical sensor interfaces. |
Applications
| Avionics Power Input Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC power entry of flight management computers against induced lightning transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary secondary surge suppression device placed immediately after input filter, clamping transients before they reach DC/DC converters and microcontrollers. Use Value: Limits clamped voltage to ≤35.5 V, ensuring downstream 36 V-rated power ICs remain within absolute maximum ratings during 18 kW surges. | Use Scenario: Safeguarding 12 V/24 V power rails in diesel engine ECUs exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS deployed across battery rail and ground to absorb both positive and negative polarity spikes from inductive switching. Use Value: Withstands 508 A peak current at 10/1000 μs, exceeding ISO 7637-2 Pulse 5a requirements and eliminating need for additional series impedance. |
| Railway Signaling Interface | Industrial Motor Drive DC Bus |
Use Scenario: Protecting Ethernet PHY and CAN transceivers in trackside signaling controllers subjected to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed at signal line entry points to shunt common-mode transients into chassis ground. Use Value: 5 μA max ID at 22 V prevents signal degradation in high-impedance data lines while maintaining fast <5 ns response for EFT immunity per IEC 61000-4-4. | Use Scenario: Clamping overvoltage on 400 V DC bus of variable-frequency drives during IGBT turn-off transients and regenerative braking events. IC Role / Device Role / Timing Role: Secondary protection stage parallel to bulk capacitors, activated only during extreme dV/dt events exceeding primary snubber capability. Use Value: 18,000 W PPP rating absorbs multi-kJ energy without thermal runaway, extending capacitor and IGBT lifetime in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA | 600 W PPP rating, 3.5 mm × 4.6 mm SMB package, 38.9 V VC @ 17.3 A IPP | Lower energy handling; suitable only for board-level ESD/EFT, not lightning or load dump. | Select SMBJ22CA only for cost-sensitive consumer electronics where surge threat level is limited to IEC 61000-4-2/4-4. |
| SMCJ22CA | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, 35.5 V VC @ 42.5 A IPP | Lacks RTCA DO-160 qualification and 18 kW surge validation; not rated for multi-stroke lightning. | Choose SMCJ22CA for industrial PLC I/O protection requiring higher energy than SMB but below aircraft-grade requirements. |
Compared with MAPLAD18KP22CAE3, SMBJ22CA and SMCJ22CA offer lower cost and smaller footprints but cannot sustain 18 kW surges or meet DO-160 Section 22 - making them unsuitable for aerospace or high-reliability automotive power rail protection where multi-event lightning immunity is mandatory.
Availability
MAPLAD18KP22CAE3 is available at Aetrix Electronics and suitable for avionics power input protection, automotive engine control unit (ECU) surge suppression, and railway signaling interface hardening requiring stable component supply and long-term lifecycle assurance.
Supply support for MAPLAD18KP22CAE3 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 (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 PLAD-series TVS diodes were developed specifically for high-energy, high-reliability transient suppression in certified airborne equipment, emphasizing thermal robustness, DO-160 compliance, and lot-traceable manufacturing.
FAQ
What is the clamping voltage of MAPLAD18KP22CAE3 at its rated peak pulse current?
The MAPLAD18KP22CAE3 has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 508 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01215 datasheet and ensures downstream components see controlled overvoltage during high-energy transients. The MAPLAD18KP22CAE3 maintains this clamping performance across its qualified operating temperature range.
Is MAPLAD18KP22CAE3 qualified for RTCA DO-160 Section 22 lightning testing?
Yes, MAPLAD18KP22CAE3 is explicitly validated for RTCA DO-160 Section 22 multi-stroke lightning testing, as confirmed in the RF01215 datasheet. It meets Level 4 pin injection per Waveform 4 (6.4/69 μs) and supports full multi-event surge endurance when mounted per recommended pad layout. The MAPLAD18KP22CAE3 achieves this via its 18,000 W PPP rating and low RθJC thermal design.
Does MAPLAD18KP22CAE3 have bidirectional polarity, and how is it implemented physically?
Yes, MAPLAD18KP22CAE3 is a bidirectional TVS, indicated by the "CA" suffix. It uses a symmetrical avalanche structure with both terminals functionally identical - no anode/cathode distinction. Physically, it has two terminals: the metal base and the top-side metallization. Both connect directly to circuit nodes, enabling equal clamping for positive and negative transients without orientation dependency.
What is the thermal resistance junction-to-case (RθJC) for MAPLAD18KP22CAE3, and why does it matter?
The MAPLAD18KP22CAE3 has a specified RθJC of 0.7 °C/W, measured with the metal base fully soldered to a thermal pad. This ultra-low value enables rapid heat extraction during repetitive surges, allowing the MAPLAD18KP22CAE3 to sustain multiple 10/1000 μs events at 0.05% duty factor without thermal runaway - critical for avionics systems requiring proven multi-stroke reliability.
How does MAPLAD18KP22CAE3 differ from standard SMCJ22CA in terms of lightning protection capability?
MAPLAD18KP22CAE3 delivers 18,000 W peak pulse power and is DO-160 Section 22 qualified, whereas SMCJ22CA is rated for only 1500 W and lacks aircraft lightning certification. The MAPLAD18KP22CAE3 also features 0.7 °C/W RθJC versus ~3.5 °C/W for SMCJ22CA, enabling superior thermal recovery between surges. These differences make MAPLAD18KP22CAE3 suitable for primary secondary lightning protection where SMCJ22CA serves only basic industrial EFT suppression.
MAPLAD18KP22CAE3 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 508A
- 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
MAPLAD18KP22CAE3 FAQ
1.How can I place an order for MAPLAD18KP22CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP22CAE3 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 MAPLAD18KP22CAE3 reliable?
The price and inventory of MAPLAD18KP22CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP22CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP22CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP22CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP22CAE3?
MAPLAD18KP22CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP22CAE3 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 MAPLAD18KP22CAE3?
For technical support, including MAPLAD18KP22CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP22CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP22CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP22CAE3 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 MAPLAD18KP22CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP22CAE3?
All MAPLAD18KP22CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP22CAE3, 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 MAPLAD18KP22CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP22CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP22CAE3 Tags
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