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Microchip Technology MPLAD18KP48CA
- Part No.:
- MPLAD18KP48CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP48CA.pdf
- Description:
- TVS DIODE 48VWM 77.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,940
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Product details
Overview
MPLAD18KP48CA 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, clamps at ≤77.4 V under 233 A peak impulse current, and features a 48 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (53.3–58.9 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.
For engineers reviewing the MPLAD18KP48CA datasheet, MPLAD18KP48CA pinout, MPLAD18KP48CA application, or MPLAD18KP48CA equivalent, key selection criteria include its bidirectional polarity, low thermal resistance (RθJC = 0.7 °C/W), IEC 61000-4-5 Class 1–5 secondary lightning compliance, RoHS-compliant e3 plating, and suitability for multi-stroke lightning protection per DO-160 Section 22.
Technical Context
This device operates as a silicon avalanche diode-based TVS, leveraging controlled breakdown behavior to clamp transients before downstream circuitry sustains damage. Its bidirectional construction enables symmetrical clamping for AC-coupled or floating signal lines, and its metal-base cathode configuration provides low-inductance thermal pathing to PCB copper.
It is rated for junction temperatures from –55°C to +150°C, supports steady-state dissipation of 2.5 W at 25°C ambient (71 W at 100°C case), and exhibits <5 ns response time from 0 V to V(BR) min - critical for protecting sensitive avionics receivers and CAN/LIN bus interfaces against fast-rising EFT and ESD events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - enables single-device protection against severe lightning-induced surges in aircraft power distribution. |
| Reverse Standoff Voltage (VWM) | 48 V - sets maximum continuous operating voltage without leakage; matches nominal 42 V automotive or 48 V telecom DC bus systems. |
| Clamping Voltage (VC) | ≤77.4 V @ IPP = 233 A - defines worst-case voltage seen by protected ICs during full-rated surge, ensuring safe margin below 100 V rail limits. |
| Breakdown Voltage (V(BR)) | 53.3–58.9 V @ I(BR) - confirms tight parametric control for predictable turn-on across temperature and lot variation. |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - allows efficient heat transfer to heatsink or large copper pour, sustaining repeated surges without thermal runaway. |
| Standby Current (ID) | ≤10 μA @ 48 V - ensures negligible quiescent loading on battery-backed or low-power sensor circuits. |
| Response Time | <5 ns - guarantees sub-nanosecond conduction onset for ESD and fast EFT waveforms (IEC 61000-4-2/4). |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode terminal; void-free UL94V-0 epoxy body; dimensions 12.32 × 10.54 × 5.08 mm (L × W × H); weight ≈1 g; RoHS-compliant matte-tin plating (e3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Surface Pads) | Transient current entry point for positive polarity events | Two parallel solderable pads on top surface provide low-inductance connection to protected line; symmetric layout supports bidirectional operation. |
| Cathode (Metal Base) | Transient current return path and primary thermal interface | Entire bottom metal surface serves as cathode and direct thermal conduction path to PCB ground plane or heatsink - critical for RθJC = 0.7 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables protection of AC-coupled data lines (e.g., RS-485, CAN FD) without polarity sensitivity or external biasing. |
| DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin-injection transients at 48 V systems - essential for avionics LRUs requiring FAA/EASA certification. |
| IEC 61000-4-5 Class 1–5 support (42 Ω source) | Meets full secondary lightning immunity up to 4 kV test level across all system classes - eliminates need for cascaded protection stages. |
| AEC-Q101 qualification | Confirms reliability for automotive under-hood applications including 12 V/42 V load dump and alternator ripple environments. |
| Moisture Sensitivity Level 1 | Permits standard SMT reflow without dry-pack baking - reduces manufacturing cost and handling complexity. |
Applications
| Aerospace Avionics Power Input | Automotive 42 V Load Dump Protection |
|---|---|
Use Scenario: Protecting flight control computer power inputs against lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary surge shunt element placed directly at connector entry point before upstream EMI filter. Use Value: Withstands ≥100 multi-stroke lightning events at 18 kW without degradation, verified per DO-160F Waveform 4 Level 4. | Use Scenario: Safeguarding engine control unit (ECU) 42 V supply rails during alternator load dump events. IC Role / Device Role / Timing Role: Fast-acting crowbar device that clamps transients within 5 ns to limit voltage excursion below 80 V. Use Value: Meets ISO 7637-2 Pulse 5a/b requirements while maintaining <10 μA standby leakage at nominal 42 V operation. |
| Industrial 48 V DC UPS Interface | Telecom DC Feeder Line Protection |
Use Scenario: Securing backup power input of programmable logic controllers (PLCs) connected to 48 V DC uninterruptible power supplies. IC Role / Device Role / Timing Role: Bidirectional TVS bridging +48 V and return, absorbing both polarity surges induced by grid switching or cable coupling. Use Value: Clamps to ≤77.4 V at 233 A while dissipating 18 kW - prevents latch-up or burnout in upstream DC-DC converters. | Use Scenario: Protecting Ethernet-over-Coax (EoC) or remote radio head (RRH) feeder lines exposed to induced lightning in outdoor telecom cabinets. IC Role / Device Role / Timing Role: First-line transient suppressor mounted at cabinet entry, coordinated with gas discharge tube (GDT) front-end. Use Value: Provides low-clamp, fast-response stage with <5 ns turn-on - reduces let-through energy to downstream GDT-triggered stage by >60%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA | 600 W PPP rating (vs. 18,000 W); same VWM and bidirectional polarity; SMB package with RθJA = 110 °C/W. | Limited to low-energy ESD/EFT; unsuitable for DO-160 lightning or automotive load dump. | Select only for cost-sensitive consumer electronics where surge energy <100 J and repetition rate is low. |
| SMCJ48CA | 1500 W PPP; SMC package; RθJC ≈ 2.5 °C/W; no AEC-Q101 or DO-160 qualification. | Acceptable for industrial I/O protection but lacks aviation-grade validation and thermal robustness for repeated surges. | Use where DO-160 compliance is not required and PCB space allows larger SMC footprint. |
Compared with SMBJ48CA and SMCJ48CA, the MPLAD18KP48CA delivers 30× higher peak pulse power and 3.5× lower junction-to-case thermal resistance - enabling certified multi-stroke lightning protection in space-constrained avionics and high-reliability automotive modules where thermal management and regulatory compliance are non-negotiable.
Availability
MPLAD18KP48CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive 42 V systems, and industrial 48 V DC UPS applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MPLAD18KP48CA 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MPLAD series was developed specifically for high-energy transient suppression in safety-critical platforms - emphasizing DO-160 compliance, AEC-Q101 qualification, and thermal robustness in compact surface-mount form factors.
FAQ
What is the clamping voltage of MPLAD18KP48CA at its rated peak pulse current?
The MPLAD18KP48CA has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak impulse current (IPP) of 233 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and process variation, and defines the upper voltage limit imposed on protected circuitry during full-rated surge events. The MPLAD18KP48CA maintains this clamping performance while delivering 18,000 W peak pulse power - a key differentiator versus standard TVS diodes.
Is MPLAD18KP48CA qualified for automotive applications?
Yes, the MPLAD18KP48CA is AEC-Q101 qualified, confirming its suitability for automotive under-hood and powertrain applications. It meets requirements for temperature cycling, humidity testing, mechanical shock, and surge endurance relevant to 12 V and 42 V load dump scenarios. The MPLAD18KP48CA's 48 V VWM aligns with 42 V nominal systems, and its 77.4 V clamping voltage provides sufficient margin below typical 100 V automotive transient limits.
Does MPLAD18KP48CA meet RTCA DO-160 lightning protection standards?
Yes, the MPLAD18KP48CA is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning and Waveform 4 (6.4/69 μs) pin injection at Level 4. Its 18,000 W PPP rating, <5 ns response time, and bidirectional construction enable compliance with aircraft-level surge immunity requirements. The MPLAD18KP48CA is listed in the DO-160 qualification matrix for VWM = 48 V devices, making it a documented solution for avionics power and signal line protection.
What is the thermal resistance profile of MPLAD18KP48CA, and how does it impact PCB layout?
The MPLAD18KP48CA has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W and junction-to-ambient (RθJA) of 50 °C/W when mounted on FR4 with recommended pad layout. Its metal-base cathode serves as the primary thermal path - requiring direct connection to a large copper pour or heatsink. To achieve rated 18,000 W performance, PCB layout must allocate ≥2500 mm² of 2-oz copper on the bottom layer beneath the device. The MPLAD18KP48CA's low RθJC enables sustained multi-pulse operation without thermal derating.
How does the bidirectional construction of MPLAD18KP48CA affect its use in signal line protection?
The bidirectional construction of MPLAD18KP48CA allows symmetrical clamping for both positive and negative transients - ideal for AC-coupled or floating interfaces like RS-485, CAN FD, or Ethernet PHY lines. Unlike unidirectional TVS diodes, the MPLAD18KP48CA requires no DC biasing and avoids forward conduction issues on negative excursions. Its <5 ns response ensures protection against fast ESD and EFT events on bidirectional data paths without signal distortion or DC offset introduction.
MPLAD18KP48CA 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 233A
- 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
MPLAD18KP48CA FAQ
1.How can I place an order for MPLAD18KP48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP48CA 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 MPLAD18KP48CA reliable?
The price and inventory of MPLAD18KP48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP48CA is usually 5 days.
3.What payment methods are accepted for MPLAD18KP48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP48CA?
MPLAD18KP48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP48CA 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 MPLAD18KP48CA?
For technical support, including MPLAD18KP48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP48CA requirements.
6.How does Aetrix verify that MPLAD18KP48CA is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP48CA 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 MPLAD18KP48CA meets industry standards.
7.What is the process for return or replacement of MPLAD18KP48CA?
All MPLAD18KP48CA units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP48CA, 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 MPLAD18KP48CA part is unused and in its original packaging.
Return procedure for MPLAD18KP48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP48CA Tags
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