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Microchip Technology MAPLAD36KP51CA
- Part No.:
- MAPLAD36KP51CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP51CA.pdf
- Description:
- TVS DIODE 51VWM 82.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,819
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Product details
Overview
MAPLAD36KP51CA 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, clamps at ≤82.4 V under 437 A peak impulse current, and features a 51 V reverse standoff voltage (VWM), meeting RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD36KP51CA datasheet, MAPLAD36KP51CA pinout, MAPLAD36KP51CA application, or MAPLAD36KP51CA 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 (Level 4 up to 400 V) and Waveform 5A (Level 4 up to 78 V), and ESD/EFT compliance per IEC 61000-4-2/4-4.
Technical Context
This TVS diode operates as a voltage-clamped crowbar during transients, with bidirectional symmetry enabling protection against both polarities of surge events. Its low thermal resistance (RθJC = 1.0 °C/W) and void-free UL94V-0 epoxy package support sustained multi-pulse operation under DO-160 test conditions.
The device exhibits a breakdown voltage range of 56.7–62.7 V at 5 mA, a maximum clamping voltage of 82.4 V at 437 A, and a temperature coefficient of breakdown voltage (αV(BR)) of +58 mV/°C - critical for stable performance across -55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - enables single-device handling of aircraft lightning-induced surges without parallel staging. |
| Reverse Standoff Voltage (VWM) | 51 V - sets maximum continuous operating voltage before clamping initiates; matches 48 V DC bus systems. |
| Clamping Voltage (VC) | ≤82.4 V @ IPP = 437 A - ensures downstream ICs rated for ≤100 V absolute max survive full-energy transients. |
| Breakdown Voltage (V(BR)) | 56.7–62.7 V @ 5 mA - defines precise turn-on threshold with <12% tolerance for predictable protection margin. |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - allows direct mounting to heatsink or copper pour for reliable multi-stroke duty cycling. |
| Surge Current Rating (IPP) | 437 A @ 10/1000 μs - exceeds IEC 61000-4-5 Class 4 (42 Ω) requirement by >2× for design margin. |
| Temperature Coefficient αV(BR) | +58 mV/°C - quantifies voltage drift over temperature; used to verify clamping headroom at +125°C ambient. |
Pinout & Package
MAPLAD36KP51CA uses a low-profile surface-mount PLAD package (12.32 × 10.54 × 5.33 mm) with metal base cathode contact on underside. The device has two terminals: anode and cathode - polarity marked only on unidirectional variants; bidirectional construction (CA suffix) has symmetric terminal behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive polarity) | Connected to protected line; conducts during positive surges when cathode is held at higher potential. |
| Cathode | Transient current return path (metal base) | Must be soldered to large copper area or heatsink; serves as primary thermal conduction path and ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection transients up to 400 V - certified for avionics backplane interfaces. |
| MIL-PRF-19500 upscreening option | Supports high-reliability screening (M, MA, MX, MXL levels) for space-qualified or mission-critical deployments. |
| IEC 61000-4-5 Class 4 compatibility (42 Ω) | Validated for secondary lightning protection in industrial control cabinets with 42 Ω source impedance. |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to reflow - reduces manufacturing cost and risk. |
Applications
| Aerospace Avionics Power Distribution | Automotive 48 V Mild Hybrid Systems |
|---|---|
Use Scenario: Protection of 28 V DC distribution buses in commercial aircraft against DO-160 Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary secondary surge clamp on main power feeders upstream of DC-DC converters and motor controllers. Use Value: Enables compliance with multi-stroke lightning testing (≥10 pulses) without degradation, leveraging 1.0 °C/W RθJC for thermal recovery. |
Use Scenario: Transient suppression on 48 V battery rails in mild hybrid vehicles subjected to load dump and alternator switching noise. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at battery connector to absorb 120 V/200 ms load dump spikes. Use Value: Clamps at ≤82.4 V while handling 437 A peak current - protects 100 V-rated SiC MOSFET gate drivers and CAN transceivers. |
| Industrial Motor Drive Control Boards | Railway Signaling Interface Modules |
Use Scenario: Surge protection for isolated encoder and analog feedback inputs exposed to inductive kickback from 3-phase inverters. IC Role / Device Role / Timing Role: Line-side TVS on differential RS-422/485 links and ±10 V analog sensor inputs. Use Value: Bidirectional symmetry ensures equal clamping for both positive and negative transients common in motor regeneration events. |
Use Scenario: Secondary protection on 72 V DC signaling lines in European railway interlocking systems compliant with EN 50121-4. IC Role / Device Role / Timing Role: Final-stage clamp before isolation barrier, meeting IEC 61000-4-5 Class 3 (42 Ω) and Class 4 (12 Ω) requirements. Use Value: 51 V VWM aligns with 72 V nominal rail derated for long-term reliability; 82.4 V VC preserves 20 V margin for downstream isolators. |
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 SMAJ51CA | Lower PPP (400 W), smaller SMC package (RθJC ≈ 15 °C/W), same VWM/VC ratings. | Suitable for consumer-grade or non-certified industrial use; not qualified for DO-160 or MIL-PRF-19500. | Select when cost and board space constrain requirements and aerospace/automotive qualification is unnecessary. |
| Vishay SM8S51CA | Higher PPP (6600 W), DO-218AB package, RθJC ≈ 2.5 °C/W, same VWM but tighter V(BR) tolerance (±5%). | Meets AEC-Q101 but lacks DO-160F Waveform 4/5A validation; limited multi-stroke endurance data. | Prefer for automotive ECUs where AEC-Q101 is mandatory but DO-160 compliance is not required. |
Compared with SMAJ51CA and SM8S51CA, MAPLAD36KP51CA provides 9× higher peak pulse power and certified DO-160F Waveform 4/5A immunity - making it uniquely suitable for aerospace primary power protection where multi-stroke survivability and traceable lot screening are mandatory.
Availability
MAPLAD36KP51CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive 48 V systems, industrial motor drives, and railway signaling applications requiring stable component supply, long-term lifecycle assurance, and qualified high-reliability sourcing.
Supply support for MAPLAD36KP51CA 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP51CA belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where multi-stroke endurance and thermal robustness are non-negotiable.
FAQ
What is the maximum clamping voltage of MAPLAD36KP51CA under standard test conditions?
The MAPLAD36KP51CA has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 437 A at the 10/1000 μs waveform. This value is measured per Figure 3 in the RF01216 Rev B datasheet and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events. Designers must ensure all protected components have voltage ratings exceeding this clamping level.
Does MAPLAD36KP51CA meet RTCA DO-160F lightning test requirements?
Yes, MAPLAD36KP51CA is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 up to 400 V and Waveform 5A (40/120 μs) Level 4 up to 78 V. These certifications are documented in the RF01216 Rev B datasheet and supported by Microsemi's application notes and test reports for aerospace-grade deployment.
How does the thermal performance of MAPLAD36KP51CA compare to standard SMC-package TVS diodes?
MAPLAD36KP51CA achieves a junction-to-case thermal resistance (RθJC) of 1.0 °C/W - over 10× better than typical SMC-package TVS diodes (~15 °C/W). This is enabled by its metal-base PLAD package, which requires direct thermal coupling to a heatsink or large copper pour. As a result, MAPLAD36KP51CA sustains repeated 36 kW surges with minimal temperature rise, unlike smaller packages that thermally saturate after 2–3 strokes.
Is MAPLAD36KP51CA RoHS compliant and what is its moisture sensitivity level?
Yes, MAPLAD36KP51CA is RoHS compliant (e3 marking), using annealed matte-tin plating per MIL-STD-750 Method 2026. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - meaning it can be stored indefinitely at ambient conditions without dry packing or baking prior to reflow soldering, simplifying manufacturing logistics and reducing process risk.
Can MAPLAD36KP51CA be used in both unidirectional and bidirectional configurations?
No - MAPLAD36KP51CA is strictly a bidirectional TVS, indicated by the "CA" suffix in its part number. Unidirectional versions (e.g., MAPLAD36KP51A) have different internal construction and polarity marking. The CA variant provides symmetrical clamping for both positive and negative transients, making it ideal for AC-coupled or floating signal paths where polarity cannot be assumed.
MAPLAD36KP51CA 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):
- 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
MAPLAD36KP51CA FAQ
1.How can I place an order for MAPLAD36KP51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP51CA 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 MAPLAD36KP51CA reliable?
The price and inventory of MAPLAD36KP51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP51CA is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP51CA?
MAPLAD36KP51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP51CA 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 MAPLAD36KP51CA?
For technical support, including MAPLAD36KP51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP51CA requirements.
6.How does Aetrix verify that MAPLAD36KP51CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP51CA 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 MAPLAD36KP51CA meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP51CA?
All MAPLAD36KP51CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP51CA, 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 MAPLAD36KP51CA part is unused and in its original packaging.
Return procedure for MAPLAD36KP51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP51CA Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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