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Microchip Technology MPLAD18KP22A
- Part No.:
- MPLAD18KP22A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP22A.pdf
- Description:
- TVS DIODE 22VWM 35.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,327
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Product details
Overview
MPLAD18KP22A 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 at ≤35.5 V under 508 A peak impulse current, and features a 22 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (24.4–26.9 V). It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22 and secondary surge suppression per IEC 61000-4-5.
For engineers reviewing the MPLAD18KP22A datasheet, MPLAD18KP22A pinout, MPLAD18KP22A application, or MPLAD18KP22A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant packaging, and multi-stroke lightning compliance are mandatory design requirements.
Technical Context
The MPLAD18KP22A employs a silicon avalanche diode structure optimized for fast response (<100 ps rise time) and stable clamping under repetitive 10/1000 μs transients. Its metal-base cathode construction enables direct thermal coupling to heatsinks, supporting sustained operation up to +150 °C junction temperature.
It meets AEC-Q101 stress testing and supports MIL-PRF-19500 upscreening options. The device operates with 10 μA max standby current at 22 V, exhibits +24 mV/°C temperature coefficient of breakdown voltage, and maintains clamping performance across -55 °C to +150 °C ambient range when mounted per recommended FR4 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation in multi-stroke lightning events |
| Reverse Standoff Voltage (VWM) | 22 V - maximum continuous DC or peak AC voltage the device blocks during normal operation |
| Breakdown Voltage (V(BR)) | 24.4–26.9 V @ I(BR) - ensures reliable avalanche initiation before system damage occurs |
| Max Clamping Voltage (VC) | 35.5 V @ 508 A - limits downstream component stress to safe levels during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink for thermal reliability |
| Standby Current (ID) | 10 μA @ 22 V - negligible leakage power loss in always-on protection circuits |
| Temperature Coefficient (αV(BR)) | +24 mV/°C - predictable V(BR) drift over temperature, simplifying margin analysis |
Pinout & Package
Package: Surface-mount thermosetting epoxy case (UL94V-0), void-free molded body with tin-lead or RoHS-compliant matte-tin terminals. Cathode is the metal base (bottom side); anode is top-side metallization. Weight ≈1 g. Dimensions: 12.32 × 10.54 × 5.08 mm (L×W×H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top metallization) | Surge current entry point for unidirectional conduction | Connected to protected line; conducts only when line voltage exceeds V(BR) relative to cathode |
| Cathode (metal base) | Reference terminal and primary thermal path | Must be soldered to large copper pour or heatsink; serves as ground reference and thermal sink |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package with metal base | Enables high-power surge handling in space-constrained layouts while delivering 0.7 °C/W thermal resistance |
| RTCA DO-160F Waveform 4 & 5A compliance | Validated for Level 4 (6.4/69 μs) and Level 4 (40/120 μs) pin-injection immunity in avionics systems |
| IEC 61000-4-5 secondary lightning protection | Qualified at Class 1–5 with 42 Ω source impedance and Class 2–4 with 12 Ω, enabling flexible system-level certification |
| AEC-Q101 qualified and MIL-PRF-19500 upscreenable | Supports automotive and defense applications requiring lot traceability, surge screening, and extended reliability validation |
| Moisture Sensitivity Level 1 | No dry-pack or baking required prior to reflow-reduces manufacturing overhead and handling risk |
Applications
| Aircraft Avionics Power Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting flight control computers and sensor interfaces from induced lightning transients on 28 V DC distribution buses. IC Role / Device Role / Timing Role: Primary clamping element placed between bus rail and chassis ground, activated within <100 ps of overvoltage onset. Use Value: Enables compliance with RTCA DO-160 Section 22 multi-stroke lightning test without derating or parallel devices. |
Use Scenario: Safeguarding engine control units (ECUs) and infotainment modules during alternator load dump events in 12 V systems. IC Role / Device Role / Timing Role: Unidirectional TVS connected across battery input, clamping 120 V/400 ms transients to ≤35.5 V. Use Value: Prevents latch-up or permanent damage in automotive-grade microcontrollers rated for ≤40 V absolute maximum. |
| Industrial DC Motor Drive Inputs | Railway Signaling Power Interfaces |
Use Scenario: Shielding PLC I/O modules and servo drive logic inputs from switching transients generated by inductive motor loads. IC Role / Device Role / Timing Role: Line-to-ground TVS on 24 V control rails, absorbing repetitive 1 kV/500 A surges from contactor bounce. Use Value: Extends mean time between failures (MTBF) by eliminating cumulative degradation seen with lower-PPP suppressors. |
Use Scenario: Protecting trackside signal processors from induced surges on 72 V DC signaling lines exposed to outdoor lightning coupling. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MPLAD18KP22CA) used in differential pair protection; unidirectional version anchors rail-to-ground paths. Use Value: Meets EN 50121-4 immunity requirements for rolling stock electronics with single-device coverage of Class 3 & 4 tests. |
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 SMAJ22A | Lower PPP (400 W), smaller SMA package, RθJA = 40 °C/W (no metal base), VWM = 22 V, VC = 35.5 V @ 11.3 A | Suitable for consumer or non-safety-critical industrial use; lacks DO-160/IEC 61000-4-5 Class 4+ validation and AEC-Q101 qualification | Select when cost and board space outweigh multi-stroke reliability and aerospace certification needs. |
| Vishay SM8S22A | Higher PPP (6600 W), DO-218AB package, RθJC = 1.5 °C/W, VWM = 22 V, VC = 35.5 V @ 187 A, AEC-Q101 qualified | Validated for automotive load dump but not RTCA DO-160F Waveform 4/5A or IEC 61000-4-5 Class 5; limited to 125 °C TJ max | Choose for automotive Tier-1 designs requiring AEC-Q101 and higher-volume supply, but not avionics certification. |
Compared with SMAJ22A and SM8S22A, the MPLAD18KP22A uniquely combines 18 kW surge capacity, metal-base thermal performance (0.7 °C/W), and full DO-160F/IEC 61000-4-5 Class 5 compliance-making it irreplaceable in certified airborne systems where single-point failure must be eliminated.
Availability
MPLAD18KP22A is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU protection, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MPLAD18KP22A 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 MPLAD18KP22A belongs to Microsemi's PLAD high-power TVS family, engineered specifically for mission-critical surge protection where thermal robustness, multi-stroke endurance, and regulatory compliance supersede cost or footprint constraints.
FAQ
What is the maximum clamping voltage of the MPLAD18KP22A under surge conditions?
The MPLAD18KP22A 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 guaranteed across the full operating temperature range and ensures downstream circuitry remains within safe voltage margins during transient events. The MPLAD18KP22A achieves this clamping performance while maintaining low thermal resistance for repeatable operation.
Is the MPLAD18KP22A suitable for RTCA DO-160F lightning protection testing?
Yes, the MPLAD18KP22A is explicitly validated for RTCA DO-160F Section 22 lightning-induced transient testing, including Waveform 4 (6.4/69 μs) at Level 4 and Waveform 5A (40/120 μs) at Level 4. Its 18,000 W peak pulse rating and metal-base thermal design enable multi-stroke compliance without performance degradation. The MPLAD18KP22A data sheet cites these qualifications directly for the full MPLAD18KP7.0A–200CA family.
Does the MPLAD18KP22A require special PCB layout considerations?
Yes - the MPLAD18KP22A requires adherence to the manufacturer's recommended pad layout to ensure thermal and electrical performance. Its metal base (cathode) must be soldered to a minimum 10 cm² copper pour or external heatsink to maintain RθJC = 0.7 °C/W. Trace inductance must be minimized on the anode path, and the device should be placed as close as possible to the protected connector or input stage. These practices are essential for the MPLAD18KP22A to deliver its rated 18 kW surge capability.
What is the polarity configuration of the MPLAD18KP22A?
The MPLAD18KP22A is a unidirectional transient voltage suppressor, indicated by the "A" suffix (as opposed to "CA" for bidirectional variants). Its cathode is the metal base (bottom side), and its anode is the top metallization. This configuration allows conduction only during positive transients on the anode relative to cathode, making it ideal for DC rail protection where reverse voltage is not expected. The MPLAD18KP22A's polarity is fixed and non-reversible in circuit implementation.
How does the MPLAD18KP22A compare to standard SMAJ or SMBJ series TVS diodes?
The MPLAD18KP22A delivers 45× more peak pulse power (18,000 W vs. ~400 W) than SMAJ22A and 2.7× more than SMBJ22A, enabled by its metal-base SMT package and optimized die architecture. Unlike those smaller packages, the MPLAD18KP22A provides documented DO-160F and IEC 61000-4-5 Class 5 compliance, AEC-Q101 qualification, and 0.7 °C/W thermal resistance. These attributes make the MPLAD18KP22A appropriate for certified safety systems where the SMAJ/SMBJ families fall short in energy handling and standards validation.
MPLAD18KP22A 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
MPLAD18KP22A FAQ
1.How can I place an order for MPLAD18KP22A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP22A 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 MPLAD18KP22A reliable?
The price and inventory of MPLAD18KP22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP22A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP22A?
MPLAD18KP22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP22A 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 MPLAD18KP22A?
For technical support, including MPLAD18KP22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP22A requirements.
6.How does Aetrix verify that MPLAD18KP22A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP22A 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 MPLAD18KP22A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP22A?
All MPLAD18KP22A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP22A, 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 MPLAD18KP22A part is unused and in its original packaging.
Return procedure for MPLAD18KP22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP22A Tags
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