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Microchip Technology MAPLAD36KP70A
- Part No.:
- MAPLAD36KP70A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP70A.pdf
- Description:
- TVS DIODE 70VWM 113VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,614
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Product details
Overview
MAPLAD36KP70A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power systems. It delivers 36 kW peak pulse power at 10/1000 μs, clamps at ≤113 V under 319 A peak impulse current, and features a 70 V reverse standoff voltage (VWM) with 77.8–86.0 V breakdown range. Its low-profile thermoset epoxy package enables robust lightning protection per RTCA DO-160 Section 22 and IEC 61000-4-5 Class 3–5.
For engineers reviewing the MAPLAD36KP70A datasheet, MAPLAD36KP70A pinout, MAPLAD36KP70A application, or MAPLAD36KP70A equivalent, this device is selected for high-reliability DC bus protection where multi-stroke lightning immunity, thermal resistance <1.0 °C/W, and RoHS-compliant solderability are critical design requirements.
Technical Context
The MAPLAD36KP70A operates as a unidirectional avalanche diode, leveraging silicon junction technology to clamp transients above its 70 V standoff threshold. Its metal-base cathode construction provides direct thermal path to PCB copper, enabling 1.0 °C/W junction-to-case thermal resistance when mounted on FR4 with recommended pad layout.
It meets RTCA DO-160F Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 up to 78 V standoff - though MAPLAD36KP70A is rated for 70 V, confirming suitability for 70 V system rails under defined waveform conditions. Secondary lightning protection per IEC 61000-4-5 is validated at 2 Ω, 12 Ω, and 42 Ω source impedances across Classes 1–5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 70 V - maximum continuous DC bus voltage before clamping initiates |
| Breakdown Voltage (V(BR)) | 77.8–86.0 V @ 5 mA - defines minimum clamping onset threshold under test |
| Max Clamping Voltage (VC) | 113 V @ 319 A - limits protected circuit voltage during worst-case surge |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables efficient heat transfer to heatsink or PCB copper pour |
| Standby Current (ID) | 10 μA @ 70 V - negligible leakage at rated operating voltage |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack required; supports standard SMT reflow |
Pinout & Package
MAPLAD36KP70A uses a proprietary surface-mount PLAD package with two terminals: anode and cathode. The cathode is the metal base (bottom side), requiring thermal pad connection to PCB ground plane for optimal heat dissipation. Package dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), with 0.200" (5.08 mm) terminal pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal | Connected to protected line (e.g., 28 V DC bus); current flows into device during surge |
| Cathode | Negative reference / thermal path | Metal baseplate - must be soldered to large copper area for thermal management and EMI return path |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW surge rating | Validated for multi-stroke lightning per RTCA DO-160 Section 22 - enables single-device compliance without external derating |
| 1.0 °C/W RθJC | Enables >70% of rated PPP dissipation via PCB copper alone - eliminates need for discrete heatsinks in space-constrained avionics |
| RoHS-compliant matte-tin plating | Meets MIL-STD-750 Method 2026 solderability - ensures reliable reflow attachment on lead-free assembly lines |
| UL94V-0 void-free epoxy body | Prevents internal delamination under thermal cycling - critical for extended life in engine bay or flight control electronics |
| 3σ lot norm screening on ID | Guarantees standby leakage ≤10 μA across production lots - avoids false triggers in high-impedance sensing circuits |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC distribution bus in flight control actuator modules exposed to lightning-induced transients per DO-160F Section 22. IC Role / Device Role / Timing Role: Primary clamping element on main power rail; absorbs multi-pulse surges without degradation. Use Value: Eliminates need for series fusing or redundant TVS stacks - reduces BOM count while meeting Class 5 waveform 4/5A requirements. |
Use Scenario: 12 V battery-fed ECU power input subjected to ISO 7637-2 load dump events up to 120 V. IC Role / Device Role / Timing Role: Unidirectional overvoltage clamp placed upstream of DC-DC converter input. Use Value: Clamps within 113 V at 319 A - protects downstream regulators rated for 120 V absolute max, preserving system uptime. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: 70 V nominal DC link in servo drive inverters subject to IGBT switching transients and induced RFI. IC Role / Device Role / Timing Role: Fast-response TVS parallel to bulk capacitor bank to suppress dV/dt spikes. Use Value: Sub-100 ps response time limits voltage overshoot to <113 V - prevents gate oxide stress in 100 V-rated MOSFETs. |
Use Scenario: 72 V DC power feed for trackside signaling relays exposed to traction return current surges and EFT bursts. IC Role / Device Role / Timing Role: Secondary protection stage after primary MOV, handling fast-rising ESD/EFT per IEC 61000-4-2/4-4. Use Value: 10 μA leakage at 70 V ensures no measurable drift in relay coil hold current - maintains SIL-2 functional safety integrity. |
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 SMAJ70A | Lower PPP (400 W), smaller SMA package, 1.5x higher clamping ratio (VC/VWM = 1.63 vs. 1.61) | Suitable only for single-stroke surges; not qualified for DO-160 multi-stroke testing | Select when cost sensitivity outweighs aerospace reliability requirements and surge energy is <10% of MAPLAD36KP70A capability |
| Vishay SM8S70A | Same 36 kW rating but TO-277 package; RθJC = 1.5 °C/W; no MIL-PRF-19500 screening option | Lacks high-reliability upscreening path and RTCA DO-160 waveform validation documentation | Choose for industrial motor drives where AEC-Q101 qualification suffices and thermal margin allows 0.5 °C/W higher resistance |
Compared with SMAJ70A and SM8S70A, MAPLAD36KP70A provides verified multi-stroke lightning endurance, lower thermal resistance, and traceable high-reliability screening - making it the sole option for DO-160-compliant avionics and mission-critical vehicle ECUs requiring zero field failures.
Availability
MAPLAD36KP70A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive DC bus applications requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD36KP70A 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on radiation-hardened, high-power, and timing-critical solutions.
The MAPLAD36KP70A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning protection in avionics and harsh-environment vehicle electronics.
FAQ
What is the clamping voltage of MAPLAD36KP70A at its rated peak pulse current?
The MAPLAD36KP70A exhibits a maximum clamping voltage (VC) of 113 V at its rated peak pulse current (IPP) of 319 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The clamping performance remains stable across temperature and multiple stroke cycles when mounted per recommended pad layout.
Is MAPLAD36KP70A qualified for RTCA DO-160F lightning testing?
Yes, MAPLAD36KP70A is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4. The device's 36 kW rating, low thermal resistance, and metal-base construction enable repeatable performance across stroke sequences - a requirement not met by standard TVS diodes. Documentation is provided in Microsemi Application Note AN-132.
Does MAPLAD36KP70A require a heatsink for full 36 kW operation?
No, MAPLAD36KP70A does not require an external heatsink when mounted on FR4 PCB using the recommended thermal pad layout (Ref. A=0.470", B=0.230"). Its 1.0 °C/W junction-to-case thermal resistance allows full 36 kW dissipation through copper pour alone, provided ambient temperature remains ≤70°C and airflow is minimal. Derating curves in Figure 3 confirm 100% power capability at TC = 100°C with proper board-level thermal design.
What is the polarity configuration of MAPLAD36KP70A?
MAPLAD36KP70A is a unidirectional TVS diode: the cathode is the metal base (bottom surface), and the anode is the top-side metallization. Polarity marking is absent on the body per datasheet note - orientation must be confirmed via package mechanical drawing. Incorrect mounting reverses clamping behavior and risks catastrophic failure during surge events.
Can MAPLAD36KP70A be used in bidirectional configurations?
No, MAPLAD36KP70A is strictly unidirectional. Bidirectional variants carry the "CA" suffix (e.g., MAPLAD36KP70CA). Using MAPLAD36KP70A in AC or bipolar signal paths will result in forward conduction during negative half-cycles, causing overheating and failure. For bidirectional protection at 70 V standoff, MAPLAD36KP70CA is the designated variant with symmetric clamping in both directions.
MAPLAD36KP70A 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 319A
- 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
MAPLAD36KP70A FAQ
1.How can I place an order for MAPLAD36KP70A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP70A 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 MAPLAD36KP70A reliable?
The price and inventory of MAPLAD36KP70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP70A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP70A?
MAPLAD36KP70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP70A 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 MAPLAD36KP70A?
For technical support, including MAPLAD36KP70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP70A requirements.
6.How does Aetrix verify that MAPLAD36KP70A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP70A 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 MAPLAD36KP70A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP70A?
All MAPLAD36KP70A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP70A, 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 MAPLAD36KP70A part is unused and in its original packaging.
Return procedure for MAPLAD36KP70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP70A Tags
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