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Microchip Technology MAPLAD18KP22A
- Part No.:
- MAPLAD18KP22A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP22A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,809
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Product details
Overview
MAPLAD18KP22A from Microsemi is a unidirectional 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, clamps transients to ≤35.5 V at 508 A, and features a 22 V reverse standoff voltage (VWM), 24.4–26.9 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance. It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MAPLAD18KP22A datasheet, MAPLAD18KP22A pinout, MAPLAD18KP22A application, or MAPLAD18KP22A equivalent, this device is selected for high-reliability DC bus protection where multi-stroke lightning immunity, low thermal resistance, and RoHS-compliant surface-mount packaging are critical - especially in avionics power distribution, 24 V/28 V vehicle electronics, and industrial motor drive front-ends.
Technical Context
The MAPLAD18KP22A employs an avalanche diode structure optimized for fast response (<100 ps turn-on) and high-energy absorption in unidirectional configuration. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under repetitive surges with ≤0.05% duty factor per MIL-STD-750 test conditions.
It is rated for junction temperatures from –55 °C to +150 °C and exhibits a +0.0024 V/°C temperature coefficient of breakdown voltage (αV(BR)). Standby leakage current is limited to 10 μA at 22 V VWM, ensuring minimal system loading during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 18,000 W @ 10/1000 μs - supports single-event lightning strike energy without failure |
| Reverse Standoff Voltage (VWM) | 22 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Clamping Voltage (VC) | 35.5 V @ 508 A - limits downstream circuit voltage during full-rated surge |
| Breakdown Voltage (V(BR)) | 24.4–26.9 V @ I(BR) - defines precise avalanche onset threshold for predictable protection |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Standby Leakage Current | 10 μA @ 22 V - negligible quiescent power loss in always-on systems |
| Package Type | PLAD (metal-base SMD) - provides mechanical robustness and low-inductance path for surge current |
Pinout & Package
The MAPLAD18KP22A uses a 2-terminal PLAD surface-mount package with the cathode on the metal base (bottom side) and the anode on the top-side metallized pad. The package measures 12.32 × 10.54 × 5.08 mm (L × W × H) and is designed for soldering onto FR4 PCBs using recommended pad layout per RF01215 Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side metallized pad) | Surge current entry point for positive transients | Connected to protected line (e.g., 24 V rail); low-inductance interface minimizes voltage overshoot |
| Cathode (metal base / bottom) | Surge current return path and thermal interface | Must be soldered to large copper pour or heatsink; serves as primary thermal conduction path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche diode architecture | Enables sub-100 ps response to fast-rising transients like ESD and lightning-induced spikes |
| Metal-base thermal design | Reduces RθJC to 0.7 °C/W - allows >71 W steady-state dissipation at TC = 100 °C |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges up to 25 °C ambient without degradation |
| IEC 61000-4-5 Class 1–5 secondary lightning protection | Validated at 42 Ω, 12 Ω, and 2 Ω source impedances - covers wide range of system-level coupling scenarios |
| AEC-Q101 qualification | Ensures reliability for automotive under-hood applications including load dump and jump-start events |
Applications
| Aerospace Power Distribution | Automotive 24 V Systems |
|---|---|
Use Scenario: Protection of avionics DC bus against lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed at power input stage of flight control units and communication radios. Use Value: Delivers 18 kW pulse handling with <100 ps response, meeting multi-stroke lightning standard while maintaining 22 V operating margin. | Use Scenario: Load dump suppression in commercial truck and off-highway vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping 24 V battery rail during alternator field decay events. Use Value: Clamps to 35.5 V at 508 A, preventing damage to 36 V-rated downstream regulators and microcontrollers. |
| Industrial Motor Drive Inputs | Railway Signaling Power Supplies |
Use Scenario: Surge protection on DC link inputs of variable frequency drives exposed to switching transients and induced RFI. IC Role / Device Role / Timing Role: High-power TVS absorbing repetitive 10/1000 μs surges from contactor switching and regenerative braking feedback. Use Value: 0.7 °C/W thermal resistance enables stable operation under 0.05% duty cycle surges without derating. | Use Scenario: Secondary lightning protection for 110 V DC signaling power supplies in trackside cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS deployed after primary MOV-based protection to handle residual fast transients. Use Value: Validated per IEC 61000-4-5 with 42 Ω source impedance (Class 1–5), ensuring interoperability with EN 50121-4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | 600 W PPP rating, SMB package, RθJA = 40 °C/W, no AEC-Q101 or DO-160 qualification | Consumer/industrial low-energy surge zones only; unsuitable for aviation or automotive load dump | Select when cost and board space constrain requirements and surge energy remains below 1 kA (10/1000 μs) |
| SMCJ22A | 1500 W PPP rating, SMC package, RθJA = 25 °C/W, AEC-Q101 qualified but not DO-160 tested | Automotive body electronics with moderate surge exposure; lacks multi-stroke lightning validation | Choose for automotive interior modules where DO-160 compliance is not mandated but AEC-Q101 is required |
Compared with SMBJ22A and SMCJ22A, the MAPLAD18KP22A offers 30× higher peak pulse power, metal-base thermal performance enabling direct heatsink mounting, and formal certification to RTCA DO-160F and IEC 61000-4-5 - making it uniquely suitable for mission-critical aerospace and heavy-duty automotive power protection where single-event survivability and multi-stroke endurance are non-negotiable.
Availability
MAPLAD18KP22A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive 24 V load dump protection, and industrial motor drive input stages requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP22A 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 MAPLAD18KP22A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for aircraft-level lightning protection and automotive-grade load dump resilience in surface-mount form factors.
FAQ
What is the clamping voltage of MAPLAD18KP22A at its rated peak pulse current?
The MAPLAD18KP22A has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current of 508 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream components see no more than 35.5 V during full-rated surge events, preserving safe operating margins for 36 V-rated circuitry.
Is MAPLAD18KP22A qualified for automotive applications?
Yes, MAPLAD18KP22A is AEC-Q101 qualified and explicitly rated for automotive load dump protection. Its 22 V VWM and 35.5 V clamping voltage align with 24 V system requirements, and its construction supports operation from –55 °C to +150 °C junction temperature - meeting under-hood environmental demands.
Does MAPLAD18KP22A meet RTCA DO-160 lightning standards?
Yes, MAPLAD18KP22A is validated for RTCA DO-160F Section 22 lightning-induced transient testing. It achieves Level 4 for Waveform 4 (6.4/69 μs) and supports multi-stroke compliance per DO-160 - confirmed in RF01215 Rev B, Table "Pin injection protection per RTCA/DO-160F".
What is the thermal resistance and how should MAPLAD18KP22A be mounted for optimal cooling?
MAPLAD18KP22A has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. For optimal cooling, the metal base (cathode) must be soldered directly to a large copper pour or external heatsink per the recommended pad layout in RF01215 Rev B. Avoid thermal vias beneath the base - use solid copper attachment to maximize conduction.
How does the polarity suffix 'A' in MAPLAD18KP22A affect circuit integration?
The 'A' suffix denotes unidirectional polarity: the cathode is on the metal base (bottom), and the anode is on the top metallized pad. This configuration requires correct orientation on the PCB - the cathode must connect to ground or the lowest potential reference - to ensure proper clamping of positive transients on the protected line.
MAPLAD18KP22A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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
MAPLAD18KP22A FAQ
1.How can I place an order for MAPLAD18KP22A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP22A 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 MAPLAD18KP22A reliable?
The price and inventory of MAPLAD18KP22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP22A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP22A?
MAPLAD18KP22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP22A 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 MAPLAD18KP22A?
For technical support, including MAPLAD18KP22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP22A requirements.
6.How does Aetrix verify that MAPLAD18KP22A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP22A 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 MAPLAD18KP22A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP22A?
All MAPLAD18KP22A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP22A, 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 MAPLAD18KP22A part is unused and in its original packaging.
Return procedure for MAPLAD18KP22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP22A Tags
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