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Microchip Technology MAPLAD18KP51CA
- Part No.:
- MAPLAD18KP51CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP51CA.pdf
- Description:
- TVS DIODE 51VWM 82.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,355
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Product details
Overview
MAPLAD18KP51CA 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 51 V reverse standoff voltage (VWM), clamps to ≤82.4 V at 219 A peak current, and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning standards.
For engineers reviewing the MAPLAD18KP51CA datasheet, MAPLAD18KP51CA pinout, MAPLAD18KP51CA application, or MAPLAD18KP51CA equivalent, this device is selected for high-reliability DC bus protection where multi-stroke lightning immunity, low thermal resistance (RθJC = 0.7 °C/W), and RoHS-compliant SMT packaging are critical design requirements.
Technical Context
The MAPLAD18KP51CA employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and high cumulative energy handling. Its metal-base package enables direct thermal coupling to PCB copper or heatsinks, supporting sustained surge duty cycles ≤0.05% per MIL-STD-750 test conditions.
It operates across –55°C to +150°C junction temperature range with 5.0 mV/°C breakdown voltage temperature coefficient and is fully surge-tested per AEC-Q101. Bidirectional symmetry ensures equal clamping performance for positive/negative transients without polarity constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without degradation |
| Reverse Standoff Voltage (VWM) | 51 V - sets maximum continuous DC operating voltage before clamping initiates |
| Clamping Voltage (VC) | ≤82.4 V @ IPP = 219 A - limits downstream IC stress during worst-case surge events |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB ground plane or heatsink |
| Clamping Response Time | <5 ns - suppresses fast-rising ESD/EFT transients before system damage occurs |
| Standby Current (ID) | ≤10 μA @ 51 V - negligible leakage in standby, preserving battery-powered system runtime |
| Breakdown Voltage (V(BR)) | 56.7–62.7 V @ I(BR) - defines precise avalanche onset threshold for predictable protection margin |
Pinout & Package
MAPLAD18KP51CA uses a surface-mount plastic package with metal base cathode termination. The device has two terminals: anode and cathode, with cathode electrically connected to the exposed metal base (bottom side). Mounting requires full-surface soldering of the metal base to a large copper pad per recommended footprint (Ref. A1 = 12.32–12.57 mm, C = 14.86–15.11 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side marked terminal) | Transient current entry point for negative surges | Connects to protected line; bidirectional operation allows current flow in either direction |
| Cathode (metal base) | Common reference and thermal path | Must be soldered to large copper area for thermal management and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Equal clamping for ± transients eliminates need for polarity-aware layout or external diode pairing |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges up to 25°C ambient - certified for avionics signal line protection |
| MIL-PRF-19500 upscreening option | Enables high-reliability screening (M, MA, MX, MXL levels) for mission-critical aerospace deployments |
| Moisture Sensitivity Level 1 | No dry-pack or baking required before reflow - reduces manufacturing overhead and avoids moisture-induced popcorning |
| RoHS-compliant matte-tin plating | Meets IPC/JEDEC J-STD-020B solderability standards and environmental compliance mandates |
Applications
| Aerospace Avionics Power Bus | Automotive Load Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses in commercial aircraft against DO-160 Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary transient voltage suppressor placed at power entry points upstream of DC-DC converters and flight control modules. Use Value: Delivers 18 kW pulse handling and <5 ns response to meet Level 4 pin injection requirements without derating at 25°C ambient. | Use Scenario: Safeguarding engine control unit (ECU) inputs during alternator load dump events in 12 V/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: High-power TVS mounted directly on main power rail to clamp 120 V/400 ms transients before reaching sensitive microcontrollers. Use Value: 51 V VWM aligns with 24 V nominal bus; 82.4 V clamping ensures downstream ICs remain below absolute maximum ratings. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: Shielding gate drivers and current sensors on 48–60 V DC link rails in variable-frequency drives subjected to switching-induced voltage spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC bus to absorb regenerative energy spikes and commutation transients. Use Value: Metal-base thermal path dissipates cumulative heating from repeated 10/1000 μs surges, enabling >10⁵ stroke endurance. | Use Scenario: Protecting Ethernet PHY and RS-485 transceivers in trackside signaling equipment exposed to induced lightning surges via long cable runs. IC Role / Device Role / Timing Role: Secondary protection device installed at interface connectors per IEC 61000-4-5 with 42 Ω source impedance. Use Value: Certified Class 1–5 performance ensures interoperability with EN 50121-4 railway EMC requirements without additional filtering stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | 600 W PPP rating, 51 V VWM, SMB package, RθJC ≈ 25 °C/W | Limited to single-stroke or low-duty-cycle surges; unsuitable for DO-160 multi-stroke testing | Select when cost-sensitive, low-energy protection suffices and thermal budget permits higher junction rise |
| SMCJ51CA | 1500 W PPP rating, 51 V VWM, SMC package, RθJC ≈ 15 °C/W | Cannot meet 18 kW DO-160 Waveform 4 Level 4; lacks MIL-PRF-19500 screening options | Choose for industrial controls needing moderate surge headroom but no aerospace qualification |
Compared with SMBJ51CA and SMCJ51CA, MAPLAD18KP51CA provides 30× and 12× higher peak pulse power respectively, lower thermal resistance for sustained surge duty, and formal certification for aviation lightning standards - making it the only suitable choice for high-reliability, multi-stroke environments.
Availability
MAPLAD18KP51CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU protection, and industrial motor drive designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAPLAD18KP51CA 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 MAPLAD18KP51CA belongs to Microsemi's PLAD high-power TVS family, engineered specifically for multi-stroke lightning protection in safety-critical platforms where thermal robustness, AEC-Q101 qualification, and DO-160 compliance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP51CA at its rated peak pulse current?
The MAPLAD18KP51CA has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 219 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures protected circuitry remains within safe operating voltage limits during surge events. The MAPLAD18KP51CA maintains this clamping performance across its full operating temperature range.
Does MAPLAD18KP51CA require special PCB layout considerations?
Yes - MAPLAD18KP51CA requires a dedicated thermal pad on the PCB matching the metal base dimensions (14.86–15.11 mm × 12.32–12.57 mm) with multiple thermal vias to inner ground planes. The cathode (metal base) must be soldered across its full area to achieve the specified 0.7 °C/W junction-to-case thermal resistance. Poor thermal land design will cause premature thermal runaway during repetitive surges. The MAPLAD18KP51CA datasheet specifies exact pad layout dimensions on page 7.
Is MAPLAD18KP51CA compliant with automotive reliability standards?
Yes - MAPLAD18KP51CA is tested and qualified to AEC-Q101 for discrete semiconductors, confirming its suitability for automotive under-hood and powertrain applications. It meets stress tests including HTRB, HTSL, and surge endurance per AEC-Q101 Rev E. The MAPLAD18KP51CA also supports optional MIL-PRF-19500 screening for enhanced reliability in mission-critical automotive subsystems.
Can MAPLAD18KP51CA be used for both unidirectional and bidirectional protection?
No - MAPLAD18KP51CA is strictly a bidirectional TVS, indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative transients without polarity dependence. For unidirectional use, the equivalent part is MAPLAD18KP51A. The MAPLAD18KP51CA's bidirectional architecture eliminates the need for external series diodes or dual-device configurations in AC-coupled or floating-bus applications.
What is the maximum steady-state power dissipation of MAPLAD18KP51CA?
The MAPLAD18KP51CA has a steady-state power dissipation (PD) of 2.5 W at TA = 25°C and 71 W at TC = 100°C (case temperature controlled on heatsink). These values reflect continuous DC power handling capability - distinct from its 18,000 W transient rating. Engineers must ensure average power in the application stays below these limits to avoid thermal failure. The MAPLAD18KP51CA derating curve (Figure 6 in RF01215) defines linear reduction between 25°C and 100°C case temperature.
MAPLAD18KP51CA 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 219A
- 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
MAPLAD18KP51CA FAQ
1.How can I place an order for MAPLAD18KP51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP51CA 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 MAPLAD18KP51CA reliable?
The price and inventory of MAPLAD18KP51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP51CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP51CA?
MAPLAD18KP51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP51CA 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 MAPLAD18KP51CA?
For technical support, including MAPLAD18KP51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP51CA requirements.
6.How does Aetrix verify that MAPLAD18KP51CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP51CA 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 MAPLAD18KP51CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP51CA?
All MAPLAD18KP51CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP51CA, 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 MAPLAD18KP51CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP51CA Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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