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Microchip Technology MAPLAD36KP33A
- Part No.:
- MAPLAD36KP33A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP33A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,315
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Product details
Overview
MAPLAD36KP33A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 36 kW peak pulse power at 10/1000 μs, features a 33 V reverse standoff voltage (VWM), clamps to ≤53.3 V at 676 A peak pulse current (IPP), and operates across –55°C to +150°C junction temperature. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD36KP33A datasheet, MAPLAD36KP33A pinout, MAPLAD36KP33A application, or MAPLAD36KP33A equivalent, key selection criteria include its 33 V VWM rating, 53.3 V max clamping voltage at 676 A, low 1.0 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and suitability for secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance (Class 1–5).
Technical Context
The MAPLAD36KP33A is a silicon avalanche diode-based TVS optimized for fast-response, high-power transient suppression. Its unidirectional polarity and metal-base cathode configuration enable efficient heat dissipation through the PCB pad layout, supported by a thermal resistance of 1.0 °C/W (junction-to-case) and 50 °C/W (junction-to-ambient on FR4).
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning surge) standards, and is validated for pin-injection immunity per RTCA/DO-160F Waveform 4 (Level 4 up to 400 V) and Waveform 5A (Level 4 up to 78 V). Standby leakage current is ≤10 μA at 33 V VWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - enables robust protection against lightning-induced surges and load dump transients without thermal runaway. |
| Reverse Standoff Voltage (VWM) | 33 V - maximum continuous operating voltage before clamping begins; matches nominal 24 V automotive and avionics bus systems. |
| Max Clamping Voltage (VC) | 53.3 V @ 676 A IPP - limits downstream voltage stress during worst-case surge, preserving connected ICs and controllers. |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - allows direct thermal coupling to heatsinked PCB copper, critical for sustained multi-pulse reliability. |
| Breakdown Voltage (V(BR)) | 36.7–40.6 V @ 5 mA - ensures predictable, repeatable avalanche conduction onset above VWM with tight tolerance. |
| Steady-State Power Dissipation | 2.5 W @ TA = 25°C - supports low-duty-cycle operation without forced cooling in compact layouts. |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - eliminates dry-pack requirement and simplifies SMT assembly logistics. |
Pinout & Package
MAPLAD36KP33A uses a surface-mount PLAD package with a metal base acting as the cathode terminal. The device has two terminals: anode (top-side marked side) and cathode (unmarked metal bottom surface). Mounting requires the recommended pad layout (A = 0.470", B = 0.230", C = 0.100") for optimal thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive surge input node | Connected to protected line (e.g., 24 V rail); conducts surge current toward cathode during overvoltage events. |
| Cathode (metal base) | Reference/return path | Must be soldered to large copper pour or heatsink; serves as primary thermal path and circuit ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche-diode architecture | Enables sub-nanosecond response to transients, clamping within <100 ps from 0 V to V(BR) min. |
| Low-profile thermoset epoxy case (UL94V-0) | Supports high-density PCB layouts while maintaining flame resistance and void-free molding integrity. |
| Tin-lead or RoHS-compliant matte-tin plating | Ensures reliable solderability per MIL-STD-750 Method 2026 and compatibility with lead-free reflow profiles. |
| AEC-Q101 qualification | Validates reliability for automotive under-hood applications including temperature cycling, humidity bias, and mechanical shock. |
| 3σ lot norm screening on standby current (ID) | Guarantees ≤10 μA leakage at rated VWM across production lots, minimizing standby power loss in always-on systems. |
Applications
| Aerospace Avionics Power Protection | Automotive 24 V Load Dump Suppression |
|---|---|
Use Scenario: Protecting flight control interface modules from induced lightning transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary secondary surge clamp on 28 V DC distribution lines feeding ARINC 429 receivers and sensor signal conditioners. Use Value: Withstands ≥100 multi-stroke lightning pulses at 36 kW without degradation, meeting Class 5 waveform 4 immunity up to 400 V. |
Use Scenario: Safeguarding engine control unit (ECU) power inputs during alternator load dump events in commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of DC/DC converters and microcontroller LDOs on 24 V supply rails. Use Value: Clamps 33 V nominal bus to ≤53.3 V during 120 V/400 ms transients, preventing latch-up or burnout in sensitive logic. |
| Industrial Motor Drive DC Bus Protection | Railway Signaling Power Interface |
Use Scenario: Shielding variable-frequency drive (VFD) control boards from switching-induced RFI and IGBT turn-off spikes. IC Role / Device Role / Timing Role: Transient suppressor across DC link capacitors and gate driver supply rails. Use Value: 1.0 °C/W RθJC enables direct thermal coupling to aluminum PCBs, sustaining repeated 36 kW surges without derating. |
Use Scenario: Securing 36 V signaling interfaces in European mainline railway signaling cabinets against EFT and surge coupling. IC Role / Device Role / Timing Role: Secondary protection element compliant with EN 50121-3-2 for conducted emissions and surge immunity. Use Value: Meets IEC 61000-4-5 Class 4 (42 Ω source) up to 33 V VWM, ensuring interoperability with legacy 36 V nominal systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Lower PPP (600 W), smaller SMB package, higher RθJA (65 °C/W), no AEC-Q101 or DO-160 qualification. | Suitable only for consumer-grade, single-event, low-energy surges; not rated for multi-stroke lightning or automotive under-hood use. | Select SMBJ33A only for cost-sensitive, non-safety-critical 33 V circuits where thermal mass and surge repetition are negligible. |
| SMCJ33A | PPP = 1500 W, SMC package, RθJC ≈ 2.5 °C/W, AEC-Q101 qualified but not DO-160 tested; clamping voltage 53.3 V same as MAPLAD36KP33A. | Limited to automotive infotainment or body electronics; insufficient for avionics or heavy-duty industrial surge duty cycles. | Choose SMCJ33A when footprint and cost constrain design, but full 36 kW capability and DO-160 compliance are not required. |
Compared with SMBJ33A and SMCJ33A, MAPLAD36KP33A provides 24× and 24× higher peak pulse power respectively, certified performance under RTCA DO-160 and IEC 61000-4-5, and superior thermal management-making it the sole option for mission-critical, multi-stroke, high-reliability surge environments.
Availability
MAPLAD36KP33A is available at Aetrix Electronics and suitable for aerospace avionics, automotive engine control, industrial motor drives, and railway signaling applications requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.
Supply support for MAPLAD36KP33A 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, mixed-signal, and radiation-hardened solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP33A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection and automotive load dump suppression in harsh-environment systems demanding AEC-Q101 and DO-160 compliance.
FAQ
What is the maximum clamping voltage of the MAPLAD36KP33A at its rated peak pulse current?
The MAPLAD36KP33A exhibits a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPP) of 676 A under 10/1000 μs waveform conditions. This value is specified in the official Microsemi RF01216 Rev B datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. Maintaining VC below 53.3 V ensures downstream components remain within safe operating voltage margins.
Is the MAPLAD36KP33A RoHS compliant, and what does the 'e3' suffix indicate?
Yes, the MAPLAD36KP33A is RoHS compliant, indicated by the 'e3' designation in its full part number (e.g., MAPLAD36KP33A-e3). Per Microsemi's nomenclature, 'e3' specifies annealed matte-tin plating that meets EU RoHS Directive 2011/65/EU and is compatible with lead-free reflow soldering processes. Non-RoHS versions omit the 'e3' suffix and use tin-lead plating.
How does the thermal design of the MAPLAD36KP33A differ from standard SMB/SMC TVS diodes?
The MAPLAD36KP33A features a metal-base PLAD package with a junction-to-case thermal resistance of just 1.0 °C/W-over 2× lower than typical SMCJ devices (~2.5 °C/W) and 6× lower than SMBJ parts (~65 °C/W). This enables direct thermal conduction from the die to the PCB copper pour or heatsink, making it viable for repetitive 36 kW surges where conventional packages would thermally saturate.
Does the MAPLAD36KP33A meet RTCA DO-160 Section 22 requirements for aircraft lightning protection?
Yes, the MAPLAD36KP33A is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing, supporting Level 4 immunity for Waveform 4 (6.4/69 μs) and Level 4 for Waveform 5A (40/120 μs) up to 400 V and 78 V respectively. Its 36 kW rating and low clamping voltage ensure compliance without external derating, unlike lower-power alternatives.
What is the polarity configuration and mounting orientation requirement for the MAPLAD36KP33A?
The MAPLAD36KP33A is a unidirectional TVS with cathode on the metal base (bottom surface) and anode on the top-marked side. Correct orientation requires the metal base to be soldered to a large copper thermal pad per the specified pad layout (A = 0.470", B = 0.230"). Reversing polarity prevents clamping action and risks catastrophic failure during overvoltage events.
MAPLAD36KP33A 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 676A
- 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
MAPLAD36KP33A FAQ
1.How can I place an order for MAPLAD36KP33A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP33A 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 MAPLAD36KP33A reliable?
The price and inventory of MAPLAD36KP33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP33A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP33A?
MAPLAD36KP33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP33A 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 MAPLAD36KP33A?
For technical support, including MAPLAD36KP33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP33A requirements.
6.How does Aetrix verify that MAPLAD36KP33A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP33A 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 MAPLAD36KP33A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP33A?
All MAPLAD36KP33A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP33A, 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 MAPLAD36KP33A part is unused and in its original packaging.
Return procedure for MAPLAD36KP33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP33A Tags
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