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Microchip Technology MAPLAD18KP12AE3
- Part No.:
- MAPLAD18KP12AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP12AE3.pdf
- Description:
- TVS DIODE 12VWM 19.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,477
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Product details
Overview
MAPLAD18KP12AE3 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 12 V reverse standoff voltage (VWM), clamps to ≤19.9 V at 905 A peak current, and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation in lightning and load-dump protection circuits.
For engineers reviewing the MAPLAD18KP12AE3 datasheet, MAPLAD18KP12AE3 pinout, MAPLAD18KP12AE3 application, or MAPLAD18KP12AE3 equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), RTCA/DO-160F Waveform 4 Level 4 compliance (7.0–200 V range), and AEC-Q101 qualified surge robustness in harsh-environment electronics.
Technical Context
The MAPLAD18KP12AE3 employs an avalanche breakdown structure optimized for fast response (<100 ps rise time) and low clamping ratio (VC/V(BR) ≈ 1.55). Its thermally enhanced metal-base package enables direct heatsinking, supporting sustained multi-stroke surge events under duty cycles ≤0.05%.
It operates across –55°C to +150°C junction temperature, meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, and is RoHS-compliant (e3 plating). Standby leakage is ≤10 μA at 12 V, and it passes ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) immunity testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft lightning-induced transients without failure |
| Reverse Standoff Voltage (VWM) | 12 V - matches nominal 12 V DC bus systems while allowing margin before conduction |
| Clamping Voltage (VC) | ≤19.9 V @ 905 A - limits downstream IC voltage stress during worst-case surge |
| Breakdown Voltage (V(BR)) | 13.3–14.7 V @ I(BR) - ensures reliable turn-on above operating voltage with defined threshold |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct mounting to heatsink for cumulative thermal management |
| Standby Leakage Current | ≤10 μA @ 12 V - negligible power loss in always-on 12 V monitoring or control circuits |
| Temperature Range | –55°C to +150°C - supports operation in engine bay, avionics bays, and industrial enclosures |
Pinout & Package
MAPLAD18KP12AE3 uses a surface-mount PLAD package with metal base cathode configuration. The cathode is the exposed metal bottom surface (thermal path and electrical return), and the anode is the top-side metallized pad. This two-terminal construction requires no polarity marking on PCB silkscreen beyond orientation alignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary thermal path to heatsink; must be soldered to large copper pour or thermal pad for RθJC = 0.7 °C/W performance |
| Top Metallized Pad | Anode | Signal/power input node; connects to protected line (e.g., battery feed, sensor supply) |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW Surge Rating | Enables single-device protection against DO-160 Section 22 multi-stroke lightning surges without cascaded TVS staging |
| 0.7 °C/W RθJC | Reduces junction temperature rise by >70% vs. standard SMD TVS, extending lifetime under repeated transients |
| AEC-Q101 Qualified | Validated for automotive under-hood applications including alternator load dump and ISO 7637-2 pulse 5a/b |
| Level 1 Moisture Sensitivity | Eliminates dry-pack requirement and bake-out prior to reflow, reducing manufacturing cost and risk of popcorning |
| e3 RoHS Compliant Plating | Matte-tin termination ensures reliable solderability and long-term intermetallic stability in high-reliability assemblies |
Applications
| Aircraft Avionics Power Input | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC power inputs of flight-critical sensors and communication modules from lightning-induced surges per RTCA/DO-160F Waveform 4 Level 4. IC Role / Device Role / Timing Role: Primary secondary surge clamp on main power rail, placed upstream of DC/DC converters and LDOs. Use Value: Clamps transients to ≤19.9 V within 100 ps, preventing latch-up or gate oxide damage in downstream ASICs and FPGAs rated for 24 V absolute max. | Use Scenario: Safeguarding 12 V battery-fed microcontroller power supplies during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-energy crowbar device absorbing up to 18,000 W for 1 ms, diverting surge current away from sensitive logic. Use Value: Eliminates need for series resistors or additional filtering stages due to low clamping voltage and high IPP (905 A), preserving system efficiency and response time. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Suppressing switching transients and induced RFI on 24–48 V DC bus lines feeding servo drives and PLC I/O modules. IC Role / Device Role / Timing Role: Fast-acting shunt protector placed at bus entry point, coordinated with upstream fuses for selective coordination. Use Value: Withstands repetitive surges (duty factor ≤0.05%) without parameter drift, ensuring long-term reliability in factory automation environments. | Use Scenario: Providing secondary lightning protection on 75 Ω coaxial or twisted-pair signaling lines (e.g., EIA-485, MVB) in train control systems per IEC 61000-4-5 Class 3 (42 Ω source). IC Role / Device Role / Timing Role: Line-to-ground clamp on isolated interface power rails, referenced to chassis ground via metal base. Use Value: Metal-base thermal path allows direct mounting to grounded enclosure, achieving <1 ns ground loop inductance and minimizing let-through voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | 600 W PPP rating, 12 V VWM, SMC package, RθJC ≈ 12 °C/W | Limited to single-stroke or low-duty-cycle surges; unsuitable for DO-160 multi-stroke or automotive load dump | Select SMBJ12A only for cost-sensitive consumer-grade 12 V systems with <500 W surge exposure. |
| SMCJ12A | 1500 W PPP rating, same VWM, larger SMC package, RθJC ≈ 5.5 °C/W | Supports moderate repetition rates but lacks AEC-Q101 qualification and DO-160 waveform validation | Choose SMCJ12A for industrial controls where full DO-160 compliance is not required but higher energy than SMBJ is needed. |
Compared with SMBJ12A and SMCJ12A, MAPLAD18KP12AE3 provides 12× and 12× higher peak pulse power respectively, validated thermal performance for continuous surge duty, and formal qualification for aerospace and automotive safety-critical use-making it the sole option when multi-stroke lightning or load dump survival is mandatory.
Availability
MAPLAD18KP12AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive powertrain, industrial motor control, and railway signaling applications requiring stable component supply, long-lifecycle support, and traceable high-reliability sourcing.
Supply support for MAPLAD18KP12AE3 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 solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP12AE3 belongs to Microsemi's high-power PLAD TVS family, engineered specifically for mission-critical surge protection where multi-stroke lightning, automotive load dump, and thermal survivability are non-negotiable design requirements.
FAQ
What is the maximum clamping voltage of MAPLAD18KP12AE3 at its rated peak pulse current?
The MAPLAD18KP12AE3 has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current of 905 A under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and ensures downstream circuitry remains below safe voltage thresholds during surge events. The clamping performance is validated across the full operating temperature range and forms the basis for system-level overvoltage margin calculations in designs using MAPLAD18KP12AE3.
Is MAPLAD18KP12AE3 qualified for automotive applications?
Yes, MAPLAD18KP12AE3 is AEC-Q101 qualified and explicitly tested for automotive load dump protection per ISO 7637-2 Pulse 5a/b. Its 18,000 W surge rating, 12 V standoff, and metal-base thermal design meet stringent under-hood reliability requirements. The device also complies with ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) standards, making MAPLAD18KP12AE3 suitable for engine control units, body control modules, and ADAS power supplies where robust transient immunity is critical.
How does the metal base of MAPLAD18KP12AE3 function electrically and thermally?
The metal base of MAPLAD18KP12AE3 serves as both the cathode terminal and primary thermal conduction path. Electrically, it must be connected to system ground or the reference plane of the protected circuit. Thermally, it provides a low-resistance path (RθJC = 0.7 °C/W) to an external heatsink or large PCB copper area, enabling effective dissipation of 18,000 W surge energy. Proper soldering of the entire base surface is mandatory to achieve specified thermal performance-partial attachment degrades RθJC and risks thermal runaway during repeated surges. This dual-role design is integral to MAPLAD18KP12AE3's high-reliability operation.
Does MAPLAD18KP12AE3 meet RTCA/DO-160F lightning protection requirements?
Yes, MAPLAD18KP12AE3 is validated for RTCA/DO-160F Section 22 lightning-induced transient protection, specifically Waveform 4 (6.4/69 μs) Level 4 across the 7.0–200 V VWM range. Its 18,000 W rating, fast response (<100 ps), and low clamping ratio enable compliance with multi-stroke lightning standards essential for commercial and military avionics. The device's thermal design and lot-traceable manufacturing further support certification documentation requirements for MAPLAD18KP12AE3 in aircraft power and signal line protection.
What is the moisture sensitivity level (MSL) and reflow profile for MAPLAD18KP12AE3?
MAPLAD18KP12AE3 is rated IPC/JEDEC J-STD-020B Level 1, meaning it has unlimited floor life and requires no dry pack or baking prior to reflow soldering. Its recommended reflow profile follows standard lead-free (SnAgCu) guidelines with peak temperature ≤260°C for 10 seconds. The e3 matte-tin plating ensures excellent wetting and joint integrity. This MSL Level 1 classification simplifies manufacturing logistics and eliminates moisture-related defects such as popcorning-key for high-yield assembly of MAPLAD18KP12AE3 in aerospace and automotive production lines.
MAPLAD18KP12AE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 905A
- 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
MAPLAD18KP12AE3 FAQ
1.How can I place an order for MAPLAD18KP12AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP12AE3 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 MAPLAD18KP12AE3 reliable?
The price and inventory of MAPLAD18KP12AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP12AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP12AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP12AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP12AE3?
MAPLAD18KP12AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP12AE3 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 MAPLAD18KP12AE3?
For technical support, including MAPLAD18KP12AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP12AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP12AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP12AE3 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 MAPLAD18KP12AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP12AE3?
All MAPLAD18KP12AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP12AE3, 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 MAPLAD18KP12AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP12AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP12AE3 Tags
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