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Microchip Technology MAPLAD36KP78CA
- Part No.:
- MAPLAD36KP78CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP78CA.pdf
- Description:
- TVS DIODE 78VWM 126VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,704
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Product details
Overview
MAPLAD36KP78CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 36,000 W peak pulse power at 10/1000 μs, features a 78 V reverse standoff voltage (VWM), clamps to ≤126 V at 286 A peak pulse current (IPP), and meets RTCA DO-160F Waveform 4 Level 4 and Waveform 5A Level 4 requirements for pin injection protection.
For engineers reviewing the MAPLAD36KP78CA datasheet, MAPLAD36KP78CA pinout, MAPLAD36KP78CA application, or MAPLAD36KP78CA equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), ESD/EFT immunity per IEC 61000-4-2/4-4, and high-reliability avionics power rail protection where low thermal resistance and traceable lot screening are mandatory.
Technical Context
This TVS diode operates as a bidirectional clamping device with symmetrical breakdown characteristics, enabling protection of AC-coupled or differential signal/power lines without polarity constraints. Its void-free thermosetting epoxy package and metal-base thermal path achieve 1.0 °C/W junction-to-case thermal resistance, supporting sustained multi-stroke surge events under controlled case temperature conditions.
The device is characterized at 25°C with 5 mA breakdown test current (I(BR)), exhibits ≤10 μA standby current (ID) at VWM, and maintains a temperature coefficient of breakdown voltage (αV(BR)) of +95 mV/°C - critical for stable clamping across -55°C to +150°C operating range in aircraft environmental control units and engine control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains single-stroke lightning-induced surges without failure in aircraft power distribution systems |
| Reverse Standoff Voltage (VWM) | 78 V - sets maximum continuous operating voltage before clamping initiates; matches nominal 72 V DC aircraft bus systems |
| Clamping Voltage (VC) | ≤126 V @ IPP = 286 A - limits downstream voltage stress to safe levels for 100 V-rated power electronics |
| Peak Pulse Current (IPP) | 286 A @ 10/1000 μs - defines maximum surge current the device safely diverts while maintaining specified VC |
| Breakdown Voltage (V(BR)) | 86.7–95.8 V @ 5 mA - ensures reliable turn-on margin above VWM for robust overvoltage response |
| Thermal Resistance (RθJC) | 1.0 °C/W - enables efficient heat transfer to heatsink or PCB copper plane, critical for repeated surge duty cycles |
| Standby Current (ID) | ≤10 μA @ VWM - minimizes leakage-induced power loss in always-on avionics subsystems |
Pinout & Package
MAPLAD36KP78CA uses a surface-mount PLAD package with two terminals: anode and cathode symmetrically arranged on opposite ends of the metal base. The metal base serves as the thermal and electrical interface, requiring direct mounting to a large copper pad for optimal thermal performance and current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive surge current entry (bidirectional) | Accepts transient current from either polarity; connects to protected line or node needing clamping |
| Cathode | Negative surge current return (bidirectional) | Completes low-inductance current path to ground or reference plane; metal base must be soldered to thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables protection of AC signals, differential buses, and floating power rails without polarity sensitivity |
| MIL-PRF-19500 upscreening option | Supports high-reliability aerospace deployments with wafer/assembly lot traceability and 3σ ID screening |
| RTCA DO-160F Waveform 5A Level 4 compliance | Validated for 40/120 μs pin-injection transients up to 78 V VWM - required for flight-critical sensor interfaces |
| IEC 61000-4-5 Class 4 support (42 Ω, 12 Ω, 2 Ω) | Meets secondary lightning protection thresholds across multiple source impedances in airframe wiring harnesses |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints - simplifies SMT assembly logistics |
Applications
| Aircraft Power Distribution Units | Avionics Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 28 V and 270 V DC bus inputs in airborne power converters against load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS diode providing sub-100 ns clamping response to limit bus overvoltage during multi-stroke events. Use Value: Prevents latch-up or destruction of upstream DC/DC controllers by clamping transients to ≤126 V while dissipating 36 kW peak energy. |
Use Scenario: Shielding ARINC 429, MIL-STD-1553, and analog sensor inputs (e.g., pressure, temperature) from ESD and pin-injection transients. IC Role / Device Role / Timing Role: Low-capacitance, fast-response TVS placed at connector entry points to shunt transients before reaching signal conditioning ICs. Use Value: Achieves RTCA DO-160F Waveform 5A Level 4 compliance (40/120 μs) without adding series impedance or signal distortion. |
| Automotive Engine Control Modules | Railway Signaling Power Interfaces |
Use Scenario: Safeguarding 12 V/24 V power inputs in ECU modules exposed to ISO 7637-2 load dump pulses and coupled RFI. IC Role / Device Role / Timing Role: High-power TVS mounted directly to chassis ground via metal base to minimize inductive loop area during surge conduction. Use Value: Withstands ≥1000 surge events at 0.05% duty factor per AEC-Q101 qualification, ensuring long-term reliability in harsh under-hood environments. |
Use Scenario: Protecting 110 V DC signaling power supplies in track-side electronic interlocking systems from induced lightning surges. IC Role / Device Role / Timing Role: Secondary surge protector installed after primary MOV-based protection to handle residual fast-rising transients. Use Value: Delivers precise clamping at 78 V VWM with <5 ns response time, preventing false triggering of safety-critical relay drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA | Lower PPP rating (600 W), smaller SMB package, higher RθJA (50 °C/W), no MIL-PRF-19500 screening | Suitable for commercial-grade industrial controls but lacks DO-160F Waveform 5A Level 4 validation and multi-stroke capability | Select when cost and board space constrain requirements and aerospace certification is not needed |
| SMCJ78CA | 3,000 W PPP rating, SMC package, RθJC ≈ 2.5 °C/W, AEC-Q101 qualified but no DO-160F data published | Applicable for automotive ECU front-end protection but insufficient for aircraft secondary lightning (IEC 61000-4-5 Class 4) or pin injection testing | Choose for automotive-grade designs requiring higher power than SMBJ but not full aerospace compliance |
Compared with SMBJ78CA and SMCJ78CA, MAPLAD36KP78CA provides 60× and 12× higher peak pulse power respectively, validated RTCA DO-160F compliance, and a thermally optimized metal-base package - making it the only option for certified airborne secondary surge protection where multi-stroke endurance and traceable reliability are mandatory.
Availability
MAPLAD36KP78CA is available at Aetrix Electronics and suitable for aircraft power distribution units, avionics sensor interfaces, and railway signaling power interfaces requiring stable component supply, long-lifecycle assurance, and certified surge immunity.
Supply support for MAPLAD36KP78CA 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, radiation-tolerant, and aerospace-qualified components.
The MAPLAD36KP78CA belongs to Microsemi's high-power PLAD TVS family, engineered specifically for certified secondary lightning protection in safety-critical aviation and defense platforms where thermal robustness and multi-stroke survivability are non-negotiable.
FAQ
What is the clamping voltage of MAPLAD36KP78CA at its rated peak pulse current?
The MAPLAD36KP78CA has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current (IPP) of 286 A under 10/1000 μs waveform conditions. This value is measured across the device terminals with proper PCB thermal design and represents the upper limit of voltage imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
Does MAPLAD36KP78CA meet RTCA DO-160F Section 22 lightning standards?
Yes, MAPLAD36KP78CA is validated for RTCA DO-160F Section 22 multi-stroke lightning testing. Specifically, it achieves Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 compliance - key requirements for secondary protection in aircraft electrical systems. These certifications are documented in Microsemi's RF01216 Rev B datasheet and supported by lot-level surge testing.
What is the thermal resistance and recommended mounting method for MAPLAD36KP78CA?
MAPLAD36KP78CA has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W. To realize this performance, the metal base must be soldered directly to a large, thermally robust PCB copper pad per the specified pad layout (Ref. A = 0.470", B = 0.230"). Use of thermal vias and internal ground planes is strongly recommended to maintain case temperature below 100°C during repetitive surge events.
Is MAPLAD36KP78CA RoHS compliant and what is its moisture sensitivity level?
Yes, MAPLAD36KP78CA is RoHS compliant (e3 marking), with annealed matte-tin plating meeting MIL-STD-750 Method 2026 solderability requirements. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - meaning it has unlimited floor life and requires no dry pack or baking prior to reflow soldering, simplifying manufacturing flow for high-reliability assemblies.
How does the bidirectional construction of MAPLAD36KP78CA affect its use in DC power line protection?
The bidirectional construction of MAPLAD36KP78CA allows it to protect both positive and negative polarity transients on the same line - ideal for DC power rails subject to reverse-polarity faults or coupled AC noise. Unlike unidirectional TVS devices, it eliminates the need for external polarity-reversal circuitry and provides symmetrical clamping behavior, reducing design complexity in dual-supply or floating-ground avionics subsystems where MAPLAD36KP78CA is commonly deployed.
MAPLAD36KP78CA 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):
- 286A
- Power - Peak Pulse:
- 36000W (36kW)
- 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
MAPLAD36KP78CA FAQ
1.How can I place an order for MAPLAD36KP78CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP78CA 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 MAPLAD36KP78CA reliable?
The price and inventory of MAPLAD36KP78CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP78CA is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP78CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP78CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP78CA?
MAPLAD36KP78CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP78CA 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 MAPLAD36KP78CA?
For technical support, including MAPLAD36KP78CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP78CA requirements.
6.How does Aetrix verify that MAPLAD36KP78CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP78CA 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 MAPLAD36KP78CA meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP78CA?
All MAPLAD36KP78CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP78CA, 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 MAPLAD36KP78CA part is unused and in its original packaging.
Return procedure for MAPLAD36KP78CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP78CA Tags
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onsemi
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Diodes Incorporated
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