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Microchip Technology MAPLAD18KP26CA
- Part No.:
- MAPLAD18KP26CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP26CA.pdf
- Description:
- TVS DIODE 26VWM 42.1VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,048
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Product details
Overview
MAPLAD18KP26CA 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 ≤42.1 V under 428 A peak impulse current, and features a 26 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (28.9–31.9 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning standards.
For engineers reviewing the MAPLAD18KP26CA datasheet, MAPLAD18KP26CA pinout, MAPLAD18KP26CA application, or MAPLAD18KP26CA equivalent, this device serves as a high-reliability, RoHS-compliant TVS for multi-stroke lightning protection, load dump suppression, and ESD/EFT hardening where low thermal resistance (RθJC = 0.7 °C/W), fast response (<5 ns), and traceable lot screening are critical.
Technical Context
The MAPLAD18KP26CA employs an avalanche diode structure optimized for bidirectional clamping across both polarities, enabling symmetrical transient suppression without polarity sensitivity. Its thermally enhanced metal-base package minimizes junction-to-case resistance (0.7 °C/W), allowing efficient heat transfer to PCB copper or heatsinks during repetitive surges up to 0.05% duty cycle.
It is characterized for operation over –55°C to +150°C junction temperature, with standby leakage ID ≤10 μA at 26 V and clamping voltage VC ≤42.1 V at IPP = 428 A (10/1000 μs). The device meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and RTCA DO-160F Waveform 4 & 5A requirements when mounted per recommended pad layout on FR4.
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 transients per DO-160 Section 22. |
| Reverse Standoff Voltage (VWM) | 26 V - maximum continuous operating voltage before clamping initiates; matches 24 V automotive and avionics bus systems. |
| Breakdown Voltage (V(BR)) | 28.9–31.9 V @ I(BR) - tight 5% tolerance ensures predictable turn-on margin above VWM for robust noise immunity. |
| Clamping Voltage (VC) | ≤42.1 V @ IPP = 428 A - limits downstream voltage stress to safe levels for 3.3 V/5 V/12 V interface ICs and controllers. |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables high-power dissipation with minimal junction temperature rise when mounted on copper heatsink pads. |
| Response Time | <5 ns - sub-nanosecond turn-on guarantees protection of fast-edge digital and RF circuits from ESD and switching spikes. |
| Standby Leakage (ID) | ≤10 μA @ 26 V - negligible quiescent current preserves battery life in always-on avionics and vehicle control modules. |
Pinout & Package
MAPLAD18KP26CA uses a surface-mount, metal-base PLAD package with two terminals: anode and cathode formed on opposite sides of the molded epoxy body. The cathode is the exposed metal base (bottom side), while the anode connects to the top-side metallized pad. This low-profile design (0.470″ × 0.230″ × 0.100″) supports high-current routing and thermal conduction through the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Pad) | Positive terminal for bidirectional conduction path | Connected to protected line; forms one half of symmetrical clamping network with cathode. |
| Cathode (Metal Base) | Negative terminal / thermal interface | Mounted directly to PCB copper pour or heatsink; provides primary thermal path and completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| Metal-base thermal design | Reduces RθJC to 0.7 °C/W-supports sustained multi-stroke surge handling without derating below 100°C case temperature. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and chassis applications including 12 V/24 V load dump events. |
| RTCA DO-160F Level 4 compliance | Guarantees survivability against 6.4/69 μs pin-injection transients at 25°C, required for commercial aircraft subsystems. |
| Lot-traceable wafer fabrication | Supports full process lot tracking for high-integrity programs requiring MIL-PRF-19500 upscreening options (M/MA/MXL). |
Applications
| Avionics Power Bus Protection | Automotive 24 V Load Dump Suppression |
|---|---|
Use Scenario: Protecting ARINC 429 data buses and 28 V DC distribution panels in commercial aircraft against lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary secondary lightning protector placed at board-level entry points to clamp transients before reaching power converters and FPGA I/O banks. Use Value: Delivers 18 kW pulse handling with <5 ns response-ensures system-level compliance without cascaded TVS stages or external snubbers. | Use Scenario: Safeguarding engine control units (ECUs) and ADAS domain controllers during alternator load dump events in heavy-duty vehicles. IC Role / Device Role / Timing Role: High-energy crowbar device shunting >400 A transients away from 5 V/3.3 V LDOs and CAN transceivers. Use Value: Clamps at ≤42.1 V while sustaining 428 A-prevents latch-up and burnout in sensitive microcontrollers rated for ≤45 V absolute max. |
| Industrial Ethernet Port Hardening | Railway Signaling Interface Protection |
Use Scenario: Securing Gigabit Ethernet PHY interfaces in factory automation gateways exposed to induced RFI and ground potential differences. IC Role / Device Role / Timing Role: Bidirectional line protector on differential pairs (TX+/TX−, RX+/RX−) meeting IEC 61000-4-5 Class 4 (42 Ω source). Use Value: Symmetrical clamping maintains signal integrity across both polarities-avoids common-mode distortion and bit errors during surge events. | Use Scenario: Shielding track circuit receivers and axle counter inputs in EN 50121-3-2 compliant railway signaling cabinets from traction return current transients. IC Role / Device Role / Timing Role: Secondary surge arrestor installed upstream of optocouplers and isolation amplifiers on 24 V DC sensor inputs. Use Value: Withstands repeated 10/1000 μs surges up to 18 kW-extends maintenance intervals and eliminates field failures due to cumulative degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA | 600 W PPP rating, SMC package, RθJC ≈ 15 °C/W - lower energy handling and higher thermal resistance. | Targeted at consumer-grade I/O ports and low-cost industrial controls-not certified for DO-160 or AEC-Q101. | Select SMBJ26CA only for cost-sensitive, non-safety-critical designs with <1 kA surge exposure. |
| SMCJ26CA | 1500 W PPP, same SMC package footprint but 25× lower peak power than MAPLAD18KP26CA. | Used in telecom line cards and PLC analog inputs-lacks RTCA DO-160F qualification and lot traceability. | Choose SMCJ26CA for space-constrained boards where 18 kW capability is unnecessary and qualification is not mandated. |
Compared with SMBJ26CA and SMCJ26CA, MAPLAD18KP26CA offers 30× and 12× higher peak pulse power respectively, validated AEC-Q101 and DO-160F compliance, and metal-base thermal performance essential for mission-critical aerospace and automotive deployments.
Availability
MAPLAD18KP26CA is available at Aetrix Electronics and suitable for avionics power conditioning, automotive ECU protection, and industrial Ethernet hardening requiring stable component supply, full lot traceability, and long-term lifecycle support.
Supply support for MAPLAD18KP26CA 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 MAPLAD18KP26CA belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning protection and load dump suppression in safety-critical platforms where thermal robustness and qualification rigor are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP26CA at its rated peak pulse current?
The MAPLAD18KP26CA has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPP) of 428 A under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and ensures downstream components remain within safe operating voltage limits during surge events. The MAPLAD18KP26CA achieves this clamping performance while maintaining sub-5 ns response time and low thermal resistance.
Is MAPLAD18KP26CA qualified for automotive applications?
Yes, MAPLAD18KP26CA is qualified to AEC-Q101 for discrete semiconductors, validating its reliability under automotive temperature cycling, humidity, and mechanical stress requirements. It is explicitly rated for 24 V load dump protection and meets IEC 61000-4-5 Class 4 (42 Ω source) for secondary lightning. The MAPLAD18KP26CA also supports optional MIL-PRF-19500 upscreening for extended reliability in powertrain and chassis modules.
Does MAPLAD18KP26CA require a heatsink for full 18 kW pulse handling?
No external heatsink is required for single-pulse 18 kW operation, as the MAPLAD18KP26CA's metal-base package and low RθJC (0.7 °C/W) enable sufficient thermal dissipation into properly designed PCB copper pads. However, for repetitive surges (>0.05% duty cycle), thermal derating per Figure 3 in the datasheet applies. The MAPLAD18KP26CA's thermal design relies on direct mounting to large copper areas-not standalone heatsinks-to maintain junction temperature within –55°C to +150°C limits.
How does the CA suffix in MAPLAD18KP26CA indicate device polarity?
Per Microsemi's nomenclature, the "CA" suffix in MAPLAD18KP26CA denotes bidirectional construction-meaning the device clamps symmetrically for both positive and negative transients. In contrast, "A"-suffixed variants (e.g., MAPLAD18KP26A) are unidirectional, with cathode on the metal base. The MAPLAD18KP26CA's bidirectional behavior eliminates polarity concerns during board layout and supports AC-coupled or floating-line protection without series diodes.
Can MAPLAD18KP26CA be used for RTCA DO-160F Level 5 pin injection protection?
No-MAPLAD18KP26CA is rated for RTCA DO-160F Level 4 pin injection (Waveform 4, 6.4/69 μs) per the datasheet, covering devices with VWM from 7.0 V to 200 V. Level 5 compliance is limited to MAPLAD18KP7.0A–130CA variants. Using MAPLAD18KP26CA for Level 5 would exceed its validated test envelope; designers requiring Level 5 must select a lower-VWM variant such as MAPLAD18KP130CA or verify performance via system-level testing.
MAPLAD18KP26CA 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 428A
- 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
MAPLAD18KP26CA FAQ
1.How can I place an order for MAPLAD18KP26CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP26CA 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 MAPLAD18KP26CA reliable?
The price and inventory of MAPLAD18KP26CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP26CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP26CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP26CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP26CA?
MAPLAD18KP26CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP26CA 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 MAPLAD18KP26CA?
For technical support, including MAPLAD18KP26CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP26CA requirements.
6.How does Aetrix verify that MAPLAD18KP26CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP26CA 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 MAPLAD18KP26CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP26CA?
All MAPLAD18KP26CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP26CA, 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 MAPLAD18KP26CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP26CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP26CA 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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Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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