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Microchip Technology MAPLAD36KP51A
- Part No.:
- MAPLAD36KP51A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP51A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,397
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Product details
Overview
MAPLAD36KP51A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 36 kW peak pulse power at 10/1000 μs, clamps at ≤82.4 V under 437 A peak impulse current, and features a 51 V reverse standoff voltage (VWM) with 56.7–62.7 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD36KP51A datasheet, MAPLAD36KP51A pinout, MAPLAD36KP51A application, or MAPLAD36KP51A equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), pin-injection immunity per RTCA/DO-160F Waveform 4 & 5A, and ESD/EFT compliance per IEC 61000-4-2/4-4 - critical for avionics power rails and vehicle ECUs.
Technical Context
The MAPLAD36KP51A operates as a silicon avalanche diode-based TVS, leveraging controlled breakdown behavior to shunt transients above its VWM threshold. Its low thermal resistance (RθJC = 1.0 °C/W) enables rapid heat dissipation during repetitive surges, while its void-free UL94V-0 epoxy package ensures mechanical robustness under thermal cycling and vibration.
It supports both steady-state power handling (2.5 W at TA = 25°C) and high-peak impulse capability (36,000 W @ 10/1000 μs), with clamping response time <5 ns and standby leakage ID ≤10 μA at 51 V. Polarity is defined by cathode on the metal base - critical for correct PCB layout orientation in unidirectional configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous DC or peak AC voltage the device blocks without conduction |
| V(BR) min/max | 56.7–62.7 V @ 5 mA - defines reliable avalanche onset window for predictable clamping initiation |
| VC @ IPP | ≤82.4 V @ 437 A - maximum voltage seen across protected circuit during worst-case 10/1000 μs surge |
| PPP | 36,000 W @ 10/1000 μs - enables suppression of lightning-induced transients exceeding 400 A without failure |
| ID @ VWM | ≤10 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| RθJC | 1.0 °C/W - allows direct mounting to heatsink for sustained multi-pulse operation without thermal runaway |
| TJ range | −55 to +150 °C - supports deployment in engine bays, avionics bays, and outdoor telecom enclosures |
Pinout & Package
MAPLAD36KP51A uses a surface-mount PLAD package with two terminals: anode and cathode. The cathode is the metal base (bottom side), requiring exposed copper pad contact for thermal and electrical connection. Anode is accessible via top-side metallization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal | Connected to protected line (e.g., 28 V aircraft bus); conducts during reverse-biased surge |
| Cathode | Ground reference / return path | Metal baseplate - must be soldered to large thermal pad for RθJC = 1.0 °C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use with temperature cycling, HTRB, and surge endurance testing |
| RTCA DO-160F Level 4/5 compliance | Withstands pin-injection transients up to 6.4/69 μs (Waveform 4) and 40/120 μs (Waveform 5A) |
| IEC 61000-4-5 Class 5 support | Secondary lightning protection at 42 Ω, 12 Ω, and 2 Ω source impedances - covers short/long distance coupling paths |
| Moisture sensitivity Level 1 | No dry pack or baking required before reflow - simplifies SMT manufacturing and reduces process risk |
| RoHS-compliant (e3) | Tin-plated terminals compatible with lead-free reflow profiles and IPC/JEDEC J-STD-020B standards |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses in commercial aircraft against lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Unidirectional TVS placed at bus entry point to clamp transients before reaching downstream regulators and FPGAs. Use Value: Enables compliance with multi-stroke lightning standard using single-device solution with 36 kW rating and <5 ns response. | Use Scenario: Safeguarding 12 V/24 V power inputs of diesel engine control modules exposed to load dump events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, coordinated with upstream fuse and downstream L-C filtering. Use Value: Withstands 36,000 W surges without degradation, maintaining VWM = 51 V to avoid false triggering during normal cranking transients. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Secondary protection on 48–72 V DC bus of variable-frequency drives subjected to switching-induced transients and EFT bursts. IC Role / Device Role / Timing Role: Fast-clamping TVS parallel to bulk capacitance, limiting voltage overshoot during IGBT turn-off. Use Value: Clamps to ≤82.4 V within nanoseconds, preventing gate oxide stress on downstream MOSFET drivers and isolated gate supplies. | Use Scenario: Protecting 51 V signaling lines in European railway interlocking systems compliant with EN 50121-3-2 for ESD and surge immunity. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; unidirectional MAPLAD36KP51A used with polarity-aware interface design. Use Value: Meets Class 4/5 IEC 61000-4-5 requirements at 42 Ω source impedance - validated for field-deployed signaling repeaters. |
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 SMAJ51A | 600 W PPP rating, SMA package, RθJA = 50 °C/W, no AEC-Q101 or DO-160 qualification | Suitable for consumer-grade industrial controls but not certified for aviation or automotive safety-critical rails | Select when cost and footprint are primary concerns and regulatory compliance is not required. |
| Vishay VMM51A | 30 kW PPP, DO-214AB package, 1.5 °C/W RθJC, AEC-Q101 qualified but no DO-160F Waveform 4/5A validation | Meets automotive load dump needs but lacks documented pin-injection test data for avionics interfaces | Select for automotive ECU designs where RTCA DO-160F is not mandated. |
Compared with SMAJ51A and VMM51A, the MAPLAD36KP51A uniquely combines 36 kW surge capacity, AEC-Q101 reliability, and full RTCA DO-160F Waveform 4/5A certification - making it the only option qualified for dual-use aerospace and high-end automotive power rail protection without derating or supplemental components.
Availability
MAPLAD36KP51A is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle assurance, and traceable high-reliability sourcing.
Supply support for MAPLAD36KP51A 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP51A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection and automotive load dump compliance in mission-critical power systems.
FAQ
What is the clamping voltage of MAPLAD36KP51A under maximum rated surge current?
The MAPLAD36KP51A has a maximum clamping voltage (VC) of 82.4 V at its peak pulse current (IPP) of 437 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 datasheet and ensures protected circuits remain below critical voltage thresholds during worst-case transients.
Is MAPLAD36KP51A qualified for automotive applications?
Yes, MAPLAD36KP51A is AEC-Q101 qualified and tested per the requirements of that standard, including temperature cycling, high-temperature reverse bias, and surge endurance. It is explicitly intended for automotive power rail protection such as engine control units and body control modules subject to ISO 7637-2 load dump events.
Does MAPLAD36KP51A meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD36KP51A is validated for RTCA DO-160F Section 22 multi-stroke lightning testing and supports pin-injection immunity per Waveform 4 (6.4/69 μs) up to Level 4 and Waveform 5A (40/120 μs) up to Level 4 - confirmed in the RF01216 datasheet revision B.
What is the thermal resistance and recommended mounting method for MAPLAD36KP51A?
MAPLAD36KP51A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W. To achieve this, the metal cathode base must be soldered directly to a large, thermally optimized PCB copper pad per the specified pad layout in the datasheet - no thermal vias or external heatsinks are required for single-pulse operation.
How does MAPLAD36KP51A differ from bidirectional variants like MAPLAD36KP51CA?
MAPLAD36KP51A is unidirectional with cathode on the base, blocking forward current and clamping reverse surges. MAPLAD36KP51CA is bidirectional, symmetric for AC or floating-rail applications. They share identical PPP, VWM, and clamping specs, but polarity and circuit integration differ - MAPLAD36KP51A requires correct orientation on DC rails, while MAPLAD36KP51CA does not.
MAPLAD36KP51A 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 437A
- 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
MAPLAD36KP51A FAQ
1.How can I place an order for MAPLAD36KP51A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP51A 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 MAPLAD36KP51A reliable?
The price and inventory of MAPLAD36KP51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP51A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP51A?
MAPLAD36KP51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP51A 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 MAPLAD36KP51A?
For technical support, including MAPLAD36KP51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP51A requirements.
6.How does Aetrix verify that MAPLAD36KP51A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP51A 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 MAPLAD36KP51A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP51A?
All MAPLAD36KP51A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP51A, 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 MAPLAD36KP51A part is unused and in its original packaging.
Return procedure for MAPLAD36KP51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP51A Tags
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