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Microchip Technology MAPLAD18KP78CAE3
- Part No.:
- MAPLAD18KP78CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP78CAE3.pdf
- Description:
- TVS DIODE 78VWM 126VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,560
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Product details
Overview
MAPLAD18KP78CAE3 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 78 V reverse standoff voltage (VWM), clamps to ≤126 V at 143 A peak impulse current (IPP), and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection (Waveform 4) and IEC 61000-4-5 Class 1–5 secondary lightning protection.
For engineers reviewing the MAPLAD18KP78CAE3 datasheet, MAPLAD18KP78CAE3 pinout, MAPLAD18KP78CAE3 application, or MAPLAD18KP78CAE3 equivalent, this device is selected for high-reliability DC bus protection where multi-stroke lightning immunity, low clamping voltage under 143 A transients, RoHS-compliant SMT mounting, and traceable lot-level screening per MIL-PRF-19500 are required.
Technical Context
This TVS diode employs an avalanche breakdown structure optimized for fast response (<5 ns clamping rise time) and stable breakdown voltage (86.7–95.8 V at I(BR)) across temperature. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation with RθJC = 0.7 °C/W and steady-state power dissipation up to 71 W at TC = 100°C.
It is rated for bidirectional operation (CA suffix), complies with IEC 61000-4-2 ESD (±30 kV air/±30 kV contact) and IEC 61000-4-4 EFT (40 A), and provides secondary lightning protection per IEC 61000-4-5 with 42 Ω, 12 Ω, and 2 Ω source impedances - validated for Class 1–5 (42 Ω), Class 1–4 (12 Ω), and Class 2–3 (2 Ω) per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 78 V - sets maximum continuous operating voltage before clamping initiates |
| Clamping Voltage (VC) | ≤126 V @ IPP = 143 A - limits downstream voltage stress during worst-case transients |
| Breakdown Voltage (V(BR)) | 86.7–95.8 V @ I(BR) - defines precise avalanche onset threshold with tight tolerance |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables high-power derating when mounted on heatsinked PCB pads |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - allows standard SMT reflow without dry-pack preconditioning |
| RoHS Compliance | e3 marking - lead-free matte-tin plating compatible with Pb-free assembly processes |
Pinout & Package
MAPLAD18KP78CAE3 uses a thermally enhanced surface-mount PLAD package with a metal base acting as the cathode terminal for bidirectional operation. The device has two terminals: anode and cathode, with polarity marked by the metal backside (cathode) per Microsemi documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive surge path input | Accepts transient energy from either polarity; connects to protected line |
| Cathode (metal base) | Common reference / heat sink interface | Serves as thermal conduction path and circuit return; must be soldered to large copper area or heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Protects AC-coupled or floating DC lines against ± polarity transients without external polarity management |
| 18 kW peak pulse rating | Meets RTCA DO-160 Section 22 multi-stroke lightning requirements for avionics power inputs |
| 0.7 °C/W RθJC | Enables >70 W steady-state dissipation at 100°C case temperature - critical for engine bay or power supply designs |
| AEC-Q101 qualification | Validated for automotive load dump and ISO 7637-2 compliance in under-hood ECUs and battery management |
| MIL-PRF-19500 upscreening option | Supports high-reliability programs requiring lot traceability, 3σ ID screening, and extended temperature validation |
Applications
| Aerospace Power Distribution | Automotive Battery Management |
|---|---|
Use Scenario: Protection of 28 V DC distribution buses in commercial aircraft against DO-160F Waveform 4 (6.4/69 μs) lightning-induced pin injection. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at bus entry point to limit transient overvoltage before it reaches downstream converters and controllers. Use Value: Clamps to ≤126 V within <5 ns while absorbing 18 kW pulses - prevents latch-up or gate oxide damage in connected FETs and PMICs. |
Use Scenario: Load dump protection on 12 V/24 V battery-fed modules (e.g., BMS, ADAS ECUs) exposed to ISO 7637-2 Pulse 5a (110 V, 400 ms). IC Role / Device Role / Timing Role: Primary overvoltage clamp parallel to input filter, activated after upstream fuses but before DC-DC regulators. Use Value: Withstands ≥1000 surge cycles at 143 A without parameter shift - ensures long-term reliability in cyclic vehicle start-stop environments. |
| Industrial Motor Drive Inputs | Railway Signaling Interfaces |
Use Scenario: Surge protection on 48 V DC control inputs of variable frequency drives subjected to IEC 61000-4-5 Class 4 (4 kV, 42 Ω source) lightning surges. IC Role / Device Role / Timing Role: Secondary protection stage following gas discharge tube (GDT) front-end, providing low-clamp refinement. Use Value: Delivers 126 V clamping at 143 A - reduces voltage overshoot below MOSFET VDS(max) ratings and avoids crowbar triggering. |
Use Scenario: Interface protection for 72 V DC track-side signaling circuits compliant with EN 50121-3-2 for railway EMC. IC Role / Device Role / Timing Role: Bidirectional clamp on signal/power pair lines to suppress coupled transients from nearby traction currents. Use Value: Qualified for IEC 61000-4-5 with 2 Ω and 12 Ω source impedances - covers both fast-rising traction noise and slower lightning coupling paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ78CA | Lower PPP (400 W), smaller SMA package, higher RθJA (50 °C/W), no AEC-Q101 or DO-160 qualification | Suitable for consumer-grade 78 V DC lines; insufficient for aerospace multi-stroke or automotive load dump duty cycles | Select when cost and board space dominate; not recommended for mission-critical or high-reliability programs |
| Vishay V180MLA0603NH | MLA varistor-based, bidirectional, 180 V VNM, 100 J energy rating, no specified clamping voltage or RθJC | Better for high-energy, low-frequency surges (e.g., AC mains); lacks nanosecond response and precise clamping needed for data/power IC protection | Prefer for AC input stages or non-time-critical industrial controls; avoid where sub-100 ns response or defined VC is required |
Compared with MAPLAD18KP78CAE3, SMAJ78CA offers compact size but lacks the 18 kW pulse capability and aerospace qualification, while V180MLA0603NH provides higher total energy handling but no guaranteed clamping performance or thermal design support - making MAPLAD18KP78CAE3 the only choice for high-reliability DC bus protection demanding both precision clamping and multi-stroke endurance.
Availability
MAPLAD18KP78CAE3 is available at Aetrix Electronics and suitable for aerospace power distribution, automotive battery management, and industrial motor drive applications requiring stable component supply, full lot traceability, and long-term lifecycle support.
Supply support for MAPLAD18KP78CAE3 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 components for aerospace, defense, and industrial markets.
The MAPLAD series was developed specifically for high-power, surface-mount transient suppression in safety-critical platforms - emphasizing thermal robustness, multi-stroke endurance, and qualification to RTCA DO-160, AEC-Q101, and MIL-PRF-19500 standards.
FAQ
What is the clamping voltage of MAPLAD18KP78CAE3 at its rated peak pulse current?
The MAPLAD18KP78CAE3 has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak impulse current (IPP) of 143 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream components remain within safe operating voltage margins during high-energy transients.
Is MAPLAD18KP78CAE3 qualified for automotive applications?
Yes, MAPLAD18KP78CAE3 is AEC-Q101 qualified and explicitly rated for automotive load dump protection per ISO 7637-2. Its 18,000 W pulse rating, 78 V standoff, and bidirectional construction make it suitable for 24 V battery systems in engine control units, battery management systems, and ADAS modules operating in under-hood environments.
Does MAPLAD18KP78CAE3 require dry pack moisture protection before SMT assembly?
No, MAPLAD18KP78CAE3 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and processed using standard SMT reflow profiles without preconditioning or dry packing. This simplifies manufacturing logistics and eliminates bake-out steps in high-volume production.
How does the metal base function in MAPLAD18KP78CAE3's thermal management?
The metal base of MAPLAD18KP78CAE3 serves as both the cathode terminal and primary thermal conduction path, delivering a low 0.7 °C/W junction-to-case thermal resistance. When soldered to a thermally optimized PCB pad or external heatsink, it enables effective dissipation of both transient energy and steady-state power - critical for maintaining reliability in high-temperature environments.
Can MAPLAD18KP78CAE3 be used for RTCA DO-160F lightning protection?
Yes, MAPLAD18KP78CAE3 is specifically validated for RTCA DO-160F Section 22 multi-stroke lightning testing and meets Level 4 pin injection (Waveform 4, 6.4/69 μs) requirements. Its 18 kW rating, fast <5 ns response, and bidirectional architecture make it appropriate for protecting avionics power inputs and signal interfaces against induced lightning transients.
MAPLAD18KP78CAE3 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):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 143A
- 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
MAPLAD18KP78CAE3 FAQ
1.How can I place an order for MAPLAD18KP78CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP78CAE3 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 MAPLAD18KP78CAE3 reliable?
The price and inventory of MAPLAD18KP78CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP78CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP78CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP78CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP78CAE3?
MAPLAD18KP78CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP78CAE3 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 MAPLAD18KP78CAE3?
For technical support, including MAPLAD18KP78CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP78CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP78CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP78CAE3 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 MAPLAD18KP78CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP78CAE3?
All MAPLAD18KP78CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP78CAE3, 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 MAPLAD18KP78CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP78CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP78CAE3 Tags
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