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Microchip Technology MAPLAD18KP43CA
- Part No.:
- MAPLAD18KP43CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP43CA.pdf
- Description:
- TVS DIODE 43VWM 69.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,459
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Product details
Overview
MAPLAD18KP43CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 43 V reverse standoff voltage (VWM), clamps to ≤69.4 V at 260 A peak impulse current (IPP), and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD18KP43CA datasheet, MAPLAD18KP43CA pinout, MAPLAD18KP43CA application, or MAPLAD18KP43CA equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), pin injection immunity per RTCA/DO-160F Waveform 4 (Level 4), and ESD/EFT compliance per IEC 61000-4-2/4-4.
Technical Context
The MAPLAD18KP43CA operates as a bidirectional avalanche diode-based TVS, with symmetrical clamping behavior across both polarities. Its low thermal resistance (RθJC = 0.7 °C/W) enables efficient heat transfer to the PCB copper pad, supporting sustained surge handling under ≤0.05% duty cycle conditions.
It is characterized for operation over –55°C to +150°C junction temperature, with 3σ lot norm screening on standby current (ID ≤10 μA @ 43 V), and complies with AEC-Q101 stress testing requirements for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - supports single-event lightning surges up to DO-160 Level 4 without failure |
| Reverse Standoff Voltage (VWM) | 43 V - maximum continuous DC or peak AC voltage the device blocks before clamping begins |
| Clamping Voltage (VC) | ≤69.4 V @ IPP = 260 A - limits downstream circuit voltage during surge to protect 75 V-rated components |
| Breakdown Voltage (V(BR)) | 47.8–52.8 V @ I(BR) - defines onset of avalanche conduction with ±5.5 V tolerance band |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables direct heat sinking to PCB copper, critical for thermal management in high-reliability mounts |
| Standby Current (ID) | ≤10 μA @ VWM - ensures negligible leakage in always-on 43 V rail applications such as avionics power buses |
| Temperature Coefficient (αV(BR)) | +49 mV/°C - quantifies V(BR) drift with temperature, enabling accurate clamping margin calculation across –55°C to +150°C |
Pinout & Package
MAPLAD18KP43CA uses a surface-mount plastic package with metal base cathode termination (bidirectional symmetry confirmed). The device has two terminals: anode and cathode are electrically symmetrical due to bidirectional construction; the metal base serves as the common thermal and electrical connection point for both polarities.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Common Terminal (Anode/Cathode Symmetric) | Provides low-inductance, low-resistance path for surge current in either polarity; requires full-surface copper pad for thermal and electrical performance |
| Top Surface Pad | Common Terminal (Anode/Cathode Symmetric) | Completes bidirectional conduction path; soldered to trace or plane; no polarity marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal/power lines without polarity concerns |
| RTCA DO-160F Waveform 4 compliance (Level 4) | Withstands 6.4/69 μs pin-injection transients at 25°C - validated for aircraft data bus and sensor interface protection |
| IEC 61000-4-5 secondary lightning protection | Rated for Class 1–5 with 42 Ω source, Class 1–4 with 12 Ω, and Class 2–3 with 2 Ω - covers wide range of system-level surge test configurations |
| Moisture sensitivity Level 1 | No dry-pack or baking required prior to reflow - simplifies SMT assembly and reduces manufacturing cost |
| AEC-Q101 qualified | Validated for automotive under-hood and powertrain applications requiring robust surge immunity and long-term reliability |
Applications
| Aircraft Avionics Power Bus Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting 28 V DC power distribution networks in commercial aircraft against induced lightning transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Bidirectional TVS placed at power entry point to clamp surges before they reach DC-DC converters and flight control modules. Use Value: Delivers 18 kW pulse handling with <100 ps response time, ensuring downstream 75 V-rated regulators remain within safe operating area during multi-stroke events. | Use Scenario: Safeguarding engine control units (ECUs) during alternator load dump events in 12 V/24 V vehicle architectures. IC Role / Device Role / Timing Role: Primary surge suppression element mounted directly at battery input connector to absorb 120 V/400 ms transients. Use Value: Clamps to ≤69.4 V at 260 A while maintaining <10 μA leakage, preventing latch-up or damage to 40 V-rated microcontrollers and CAN transceivers. |
| Industrial Ethernet Port Surge Protection | Railway Signaling Interface Protection |
Use Scenario: Securing Gigabit Ethernet PHY interfaces in outdoor industrial gateways exposed to induced surges via unshielded cabling. IC Role / Device Role / Timing Role: Bidirectional TVS deployed across differential pairs (e.g., TX+/TX−) to suppress common-mode transients without distorting signal integrity. Use Value: Symmetrical clamping ensures equal voltage limiting on both lines, preserving differential swing and meeting IEC 61000-4-5 Level 4 (42 Ω) immunity requirements. | Use Scenario: Protecting 48 V DC signaling circuits in train control systems subject to traction-induced ground potential rise and lightning coupling. IC Role / Device Role / Timing Role: Secondary protection device installed upstream of optocouplers and level shifters in trackside interlocking logic. Use Value: Withstands repeated 2 Ω source impedance surges (Class 2/3) and maintains stable VWM over –40°C to +85°C ambient, ensuring fail-safe operation in harsh rail environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | 600 W PPP rating (vs. 18,000 W); same VWM and bidirectional polarity; SMA package with RθJA ≈ 40 °C/W | Limited to low-energy ESD/EFT; unsuitable for DO-160 lightning or load dump | Select SMBJ43CA only for board-level ESD protection where surge energy is <10 J; not a functional replacement for MAPLAD18KP43CA |
| SMCJ43CA | 1500 W PPP rating; same VWM and bidirectionality; SMC package with RθJC ≈ 2.5 °C/W (vs. 0.7 °C/W) | Supports moderate automotive transients but fails DO-160 Level 4 and multi-stroke lightning | Use SMCJ43CA for cost-sensitive 12 V systems with lower surge severity; requires thermal derating above 70°C ambient |
Compared with SMBJ43CA and SMCJ43CA, the MAPLAD18KP43CA provides >12× higher peak pulse power, 3.6× lower junction-to-case thermal resistance, and certified compliance with RTCA DO-160F Waveform 4 - making it uniquely suitable for aerospace primary surge protection where single-event survivability is non-negotiable.
Availability
MAPLAD18KP43CA is available at Aetrix Electronics and suitable for aircraft avionics, automotive powertrain electronics, industrial Ethernet infrastructure, and railway signaling systems requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP43CA 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 MAPLAD18KP43CA belongs to Microsemi's PLAD high-power TVS family, engineered specifically for multi-stroke lightning protection and automotive load dump suppression in safety-critical platforms where failure is not an option.
FAQ
What is the clamping voltage specification for MAPLAD18KP43CA at its rated peak impulse current?
The MAPLAD18KP43CA has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak impulse current (IPP) of 260 A under 10/1000 μs waveform conditions. This value is measured at 25°C and guarantees that downstream circuitry remains below 75 V during surge events, protecting common 75 V-rated power management ICs and interface devices. The MAPLAD18KP43CA maintains this clamping performance across its full operating temperature range with defined derating curves.
Does MAPLAD18KP43CA meet AEC-Q101 qualification requirements for automotive use?
Yes, MAPLAD18KP43CA is tested and qualified to AEC-Q101 standards for discrete semiconductors. It undergoes stress testing including HTGB, HTRB, TST, and surge endurance per the AEC-Q101-004 standard. This qualification confirms suitability for automotive powertrain and chassis applications, including alternator load dump protection in 12 V/24 V systems. The MAPLAD18KP43CA's 3σ lot norm screening on standby current further supports its use in mission-critical automotive electronics.
How does the bidirectional construction of MAPLAD18KP43CA affect its PCB layout and mounting?
The bidirectional construction of MAPLAD18KP43CA eliminates polarity constraints: both terminals are functionally identical, and the metal base serves as a symmetric conduction path. Layout requires a full-surface copper pad matching the 12.32 mm × 10.54 mm footprint, with no orientation dependency. Thermal performance depends entirely on copper area and thickness - the MAPLAD18KP43CA's 0.7 °C/W RθJC is only achieved with recommended pad dimensions and ≥2 oz copper. No silkscreen polarity marking is needed.
Can MAPLAD18KP43CA be used for IEC 61000-4-5 compliance testing with 2 Ω source impedance?
Yes, MAPLAD18KP43CA is explicitly rated for IEC 61000-4-5 secondary lightning protection with 2 Ω source impedance at Class 2 and Class 3 levels. Its 18,000 W peak pulse power and low clamping voltage ensure compliance in high-current, fast-rising surge scenarios typical of ground potential rise events. The MAPLAD18KP43CA's ability to handle repeated strokes without parameter shift - verified per RTCA DO-160 Section 22 - makes it appropriate for systems requiring multi-pulse resilience under 2 Ω test conditions.
What is the moisture sensitivity level (MSL) and reflow profile requirement for MAPLAD18KP43CA?
MAPLAD18KP43CA is rated MSL Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and requires no dry-packaging or baking prior to reflow soldering. Its thermosetting epoxy body withstands standard lead-free reflow profiles, including peak temperatures up to 260°C for 10 seconds. The MAPLAD18KP43CA's RoHS-compliant matte-tin plating ensures reliable wetting and joint formation without voiding or dewetting issues during automated SMT assembly.
MAPLAD18KP43CA 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 260A
- 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
MAPLAD18KP43CA FAQ
1.How can I place an order for MAPLAD18KP43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP43CA 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 MAPLAD18KP43CA reliable?
The price and inventory of MAPLAD18KP43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP43CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP43CA?
MAPLAD18KP43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP43CA 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 MAPLAD18KP43CA?
For technical support, including MAPLAD18KP43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP43CA requirements.
6.How does Aetrix verify that MAPLAD18KP43CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP43CA 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 MAPLAD18KP43CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP43CA?
All MAPLAD18KP43CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP43CA, 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 MAPLAD18KP43CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP43CA Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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