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Microchip Technology MPLAD18KP24CA
- Part No.:
- MPLAD18KP24CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP24CA.pdf
- Description:
- TVS DIODE 24VWM 38.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,600
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Product details
Overview
MPLAD18KP24CA 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 24 V reverse standoff voltage (VWM), clamps to ≤38.9 V at 463 A peak impulse current (IPP), and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning standards.
For engineers reviewing the MPLAD18KP24CA datasheet, MPLAD18KP24CA pinout, MPLAD18KP24CA application, or MPLAD18KP24CA equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant matte-tin terminations, and MIL-PRF-19500 upscreening capability are critical design requirements.
Technical Context
The MPLAD18KP24CA employs an avalanche diode structure optimized for multi-stroke lightning transients per RTCA DO-160 Section 22. Its bidirectional construction enables symmetrical clamping on both polarities without external circuitry, and its metal-base package provides direct thermal path to heatsink mounting - validated by RθJC = 0.7 °C/W and RθJA = 50 °C/W on FR4 with recommended pad layout.
It supports secondary lightning protection per IEC 61000-4-5 under 42 Ω, 12 Ω, and 2 Ω source impedances (Class 1–5, 1–4, and 2–3 respectively), and passes ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) immunity testing. Clamping response time is <5 ns, with breakdown voltage V(BR) specified at 26.7–29.5 V @ I(BR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 24 V - maximum continuous DC or peak AC voltage before conduction begins |
| Clamping Voltage (VC) | ≤38.9 V @ IPP = 463 A - limits downstream voltage stress during surge events |
| Breakdown Voltage (V(BR)) | 26.7–29.5 V @ I(BR) - defines onset of avalanche conduction with tight 10% tolerance |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables efficient heat transfer to heatsink, critical for repeated surge duty |
| Standby Current (ID) | ≤10 μA @ VWM - ensures negligible leakage in standby, preserving system efficiency |
| Response Time | <5 ns - fast enough to protect sensitive analog and digital interfaces from EFT/ESD |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode/Cathode) with metal baseplate for thermal conduction. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H); weight ≈1 g; UL94V-0 epoxy body; matte-tin (e3) RoHS-compliant terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Metal Base) | Current path terminal (bidirectional) | Both terminals function identically; cathode is marked on metal base per datasheet - no polarity sensitivity in circuit placement |
| Top Surface Pad | Electrical connection point | Provides low-inductance interface to PCB trace; soldered per MIL-STD-750 Method 2026 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Eliminates need for dual-device configurations in AC or floating DC lines - reduces BOM count and board area |
| 18 kW surge rating | Meets RTCA DO-160F Waveform 4 (Level 4) and IEC 61000-4-5 Class 5 with 42 Ω source - certified for aircraft avionics |
| 0.7 °C/W junction-to-case thermal resistance | Enables >2× higher surge repetition rate vs. standard SMD TVS when mounted on heatsink - extends service life in cyclic environments |
| MIL-PRF-19500 upscreening option | Supports M, MA, MX, MXL reliability levels - required for military/aerospace programs with lot traceability and 3σ ID screening |
| Moisture Sensitivity Level 1 | No dry pack or baking required before reflow - simplifies manufacturing and reduces process risk |
Applications
| Aircraft Avionics Power Bus Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting 28 V DC distribution networks in flight control computers and sensor interfaces against DO-160F Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary surge shunt element placed directly across input rails, clamping transients within 5 ns to prevent latch-up or damage to downstream DC/DC converters. Use Value: Enables compliance with RTCA DO-160F Level 4 pin injection (6.4/69 μs) and multi-stroke waveform endurance - verified per test report RF01215 Rev B. | Use Scenario: Safeguarding engine control units (ECUs) and infotainment modules during alternator load dump events (ISO 7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Bidirectional TVS connected between battery rail and ground, absorbing 120 V/100 ms transients without degradation. Use Value: Withstands ≥1000 surge cycles at 463 A due to low thermal resistance and robust wafer fabrication - exceeds AEC-Q101 qualification requirements. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Interface Protection |
Use Scenario: Shielding IGBT gate drivers and current sensors in variable-frequency drives from switching-induced transients and inductive kickback. IC Role / Device Role / Timing Role: Mounted across DC link capacitors to clamp voltage spikes exceeding 24 V nominal bus, preventing overvoltage shutdown or component failure. Use Value: 38.9 V clamping voltage ensures MOSFETs and op-amps remain within safe operating area - validated under 10/1000 μs waveform with 0.05% duty factor. | Use Scenario: Securing 24 V signaling lines in train control systems against EFT bursts (IEC 61000-4-4) and lightning coupling from track-side infrastructure. IC Role / Device Role / Timing Role: Installed at field interface connectors to divert common-mode surges before entering isolation barriers or level-shifting circuits. Use Value: Passes IEC 61000-4-5 Class 4 (2 Ω source) and ESD ±15 kV contact discharge - confirmed via factory surge testing per Microsemi internal protocol. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | 600 W PPP rating, 300 A IPP, SMC package - lower surge capacity and higher RθJA (60 °C/W) | Suitable only for consumer-grade or non-safety-critical 24 V lines; not qualified for DO-160 or AEC-Q101 | Select SMBJ24CA only for cost-sensitive, low-duty-cycle applications where 18 kW rating is unnecessary |
| SMCJ24CA | 1500 W PPP, 61.5 V VC @ 243 A IPP, same SMC package - 12× lower peak power than MPLAD18KP24CA | Limited to industrial PLC I/O protection; cannot meet DO-160F Level 4 or IEC 61000-4-5 Class 5 | Choose SMCJ24CA when footprint compatibility with legacy SMC layouts is mandatory and surge energy is below 1 kJ |
Compared with SMBJ24CA and SMCJ24CA, the MPLAD18KP24CA delivers 30× and 12× higher peak pulse power respectively, enabling single-device compliance with aerospace lightning standards - while its metal-base thermal path supports sustained operation where ambient temperatures exceed 100°C.
Availability
MPLAD18KP24CA is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECU, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.
Supply support for MPLAD18KP24CA 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, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.
The MPLAD18KP24CA belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection in mission-critical platforms where thermal performance, surge endurance, and qualification to RTCA DO-160 and AEC-Q101 are mandatory.
FAQ
What is the clamping voltage of MPLAD18KP24CA at its rated peak pulse current?
The MPLAD18KP24CA has a maximum clamping voltage (VC) of 38.9 V at its peak impulse current (IPP) of 463 A under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures downstream components remain within safe operating voltage limits during high-energy transients. The MPLAD18KP24CA achieves this performance using a low-inductance metal-base package and optimized silicon geometry.
Is MPLAD18KP24CA qualified to AEC-Q101 for automotive use?
Yes, the MPLAD18KP24CA is tested in accordance with AEC-Q101 requirements for discrete semiconductors, including high-temperature operating life, temperature cycling, and surge robustness. Its bidirectional construction, 24 V standoff, and 18 kW rating make it suitable for automotive load dump protection per ISO 7637-2 Pulse 5. The MPLAD18KP24CA also supports optional MIL-PRF-19500 upscreening for enhanced reliability in harsh environments.
Does MPLAD18KP24CA require special PCB layout considerations?
Yes - the MPLAD18KP24CA requires a thermally optimized pad layout per datasheet RF01215 Rev B, including a large copper pour connected to the metal base for heatsinking. Its RθJC of 0.7 °C/W depends on proper thermal vias and mounting pressure. Avoid narrow traces between the device and protected node; keep lead lengths under 2 mm to preserve <5 ns response. The MPLAD18KP24CA's performance degrades significantly if thermal or inductive constraints are ignored.
Can MPLAD18KP24CA be used in bidirectional AC signal lines?
Yes, the 'CA' suffix confirms bidirectional construction, making the MPLAD18KP24CA appropriate for protecting AC-coupled or floating DC interfaces such as RS-485, CAN FD, or sensor bridges. Its symmetrical V-I curve ensures identical clamping in both directions. However, ensure the 24 V VWM aligns with the peak AC voltage; for 24 Vrms signals, select a higher VWM variant like MPLAD18KP36CA to avoid conduction during normal operation. The MPLAD18KP24CA is not intended for continuous AC voltage regulation.
What is the moisture sensitivity level (MSL) of MPLAD18KP24CA?
The MPLAD18KP24CA has Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ≤30°C/60% RH without dry packing or baking prior to reflow. This eliminates handling overhead in manufacturing and avoids moisture-related popcorning during soldering. The MPLAD18KP24CA's void-free epoxy body and annealed matte-tin terminations contribute to this robust MSL rating.
MPLAD18KP24CA 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 463A
- 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
MPLAD18KP24CA FAQ
1.How can I place an order for MPLAD18KP24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP24CA 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 MPLAD18KP24CA reliable?
The price and inventory of MPLAD18KP24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP24CA is usually 5 days.
3.What payment methods are accepted for MPLAD18KP24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP24CA?
MPLAD18KP24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP24CA 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 MPLAD18KP24CA?
For technical support, including MPLAD18KP24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP24CA requirements.
6.How does Aetrix verify that MPLAD18KP24CA is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP24CA 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 MPLAD18KP24CA meets industry standards.
7.What is the process for return or replacement of MPLAD18KP24CA?
All MPLAD18KP24CA units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP24CA, 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 MPLAD18KP24CA part is unused and in its original packaging.
Return procedure for MPLAD18KP24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP24CA Tags
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