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Microchip Technology MPLAD36KP28A
- Part No.:
- MPLAD36KP28A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP28A.pdf
- Description:
- TVS DIODE 28VWM 46.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,660
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Product details
Overview
MPLAD36KP28A 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 28 V reverse standoff voltage (VWM), clamps transients to ≤46.4 V at 776 A, and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the MPLAD36KP28A datasheet, MPLAD36KP28A pinout, MPLAD36KP28A application, or MPLAD36KP28A equivalent, key selection criteria include its DO-160 Section 22 multi-stroke lightning compliance, IEC 61000-4-5 Class 4 support with 42 Ω source impedance, low thermal resistance (RθJC = 1.0 °C/W), and RoHS-compliant e3 plating - all critical for avionics and load-dump hardened designs.
Technical Context
This TVS diode uses silicon avalanche technology to provide fast-response clamping (<100 ps rise time) against high-energy transients including lightning-induced surges, automotive load dump, and EFT pulses. Its metal-base package enables direct thermal coupling to PCB copper or heatsinks, supporting sustained multi-pulse operation under ≤0.05% duty factor.
It meets AEC-Q101 stress testing requirements and supports secondary lightning protection per IEC 61000-4-5 at multiple source impedances (2 Ω, 12 Ω, 42 Ω), with verified performance up to Level 5 pin injection per RTCA/DO-160F Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation under defined test conditions. |
| Reverse Standoff Voltage (VWM) | 28 V - maximum continuous DC or peak AC voltage the device blocks without clamping; matches 24 V nominal systems with margin. |
| Clamping Voltage (VC) | 46.4 V @ 776 A - limits downstream circuit voltage during worst-case surge, enabling robust overvoltage margin for 3.3 V–28 V logic and power rails. |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables efficient heat transfer to PCB copper pour or external heatsink, critical for multi-stroke reliability. |
| Breakdown Voltage (V(BR)) | 31.1–34.4 V @ 5 mA - defines minimum avalanche conduction threshold; ensures stable triggering above VWM. |
| Standby Current (ID) | 10 μA @ 28 V - negligible leakage at rated standoff, preserving system efficiency and battery life in always-on applications. |
| Temperature Range | –55 °C to +150 °C - qualified for extended-temperature environments including engine bays and avionics bays. |
Pinout & Package
Package: PLAD (Plastic Low-profile Anode-down) surface-mount package with metal base acting as cathode terminal. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ~1.7–2.0 g. Cathode is the exposed metal base; anode is top-side metallization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary current return path and thermal interface; must be soldered to large copper area or heatsink for RθJC = 1.0 °C/W performance. |
| Top-Side Metallization | Anode | Input connection point for protected line; requires standard SMT reflow profile (TSP = 260 °C @ 10 s). |
Key Features
| Feature | Design Value |
|---|---|
| DO-160 Section 22 Multi-Stroke Lightning Compliance | Validated for ≥1000 surges at full 36 kW rating - essential for aircraft power distribution and flight control electronics. |
| IEC 61000-4-5 Class 4 Support (42 Ω) | Rated for 4 kV surge immunity with 42 Ω source impedance - meets stringent secondary lightning protection for ground-support equipment. |
| Low Profile Surface-Mount Construction | Height ≤5.33 mm - enables compact placement near connectors or power inputs without interfering with enclosures or adjacent components. |
| RoHS Compliant e3 Matte-Tin Plating | Lead-free, solderable per MIL-STD-750 Method 2026 - eliminates lead contamination risk while ensuring reliable reflow joint formation. |
| AEC-Q101 Qualified | Stress-tested per automotive-grade reliability standards - confirms suitability for under-hood and safety-critical vehicle subsystems. |
Applications
| Aircraft Power Distribution | Automotive Load Dump Protection |
|---|---|
|
Use Scenario: Protecting 28 V DC bus lines in commercial aircraft avionics racks from lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at bus entry point to clamp surges before they reach upstream converters and controllers. Use Value: Enables compliance with multi-stroke lightning certification using a single discrete component, eliminating need for cascaded protection stages. |
Use Scenario: Safeguarding engine control units (ECUs) and body control modules (BCMs) during alternator load dump events in 24 V vehicle systems. IC Role / Device Role / Timing Role: Primary surge suppression element on battery feed line, triggered within <100 ps to limit voltage to ≤46.4 V. Use Value: Prevents latch-up and permanent damage in microcontrollers and CAN transceivers by maintaining clamped voltage below absolute maximum ratings. |
| Industrial Motor Drive Inputs | Railway Signaling Interfaces |
|
Use Scenario: Shielding variable-frequency drive (VFD) input terminals from switching transients and induced RFI in factory automation systems. IC Role / Device Role / Timing Role: High-power TVS mounted directly at AC/DC rectifier input to absorb repetitive 36 kW surges without derating. Use Value: Extends mean time between failures (MTBF) of motor drives operating in electrically noisy environments with frequent contactor switching. |
Use Scenario: Securing trackside signaling interfaces against induced surges from nearby traction currents and lightning coupling in rail infrastructure. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MPLAD36KP28CA) used on differential RS-485 lines to suppress common-mode transients up to ±4 kV. Use Value: Maintains signal integrity and prevents false triggering in fail-safe interlocking systems by limiting transient overshoot to <46.4 V. |
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 SMAJ28A | Lower PPP (400 W), smaller SMA package, higher RθJA (60 °C/W), no DO-160 qualification. | Suitable only for low-energy ESD/EFT; cannot replace MPLAD36KP28A in lightning or load-dump scenarios. | Select only for cost-sensitive consumer electronics where 36 kW surge capability is unnecessary. |
| Vishay V28MLA0603NH | Multi-layer varistor (MLV), 28 V VWM, 100 J energy rating, slower response (>1 ns), no AEC-Q101 or DO-160 data. | Acceptable for basic IEC 61000-4-5 Class 3; lacks multi-stroke validation and thermal performance for aerospace use. | Consider for industrial controls with moderate surge exposure but avoid in certified avionics or automotive safety systems. |
Compared with SMAJ28A and V28MLA0603NH, the MPLAD36KP28A uniquely combines 36 kW pulse handling, DO-160 Section 22 multi-stroke validation, AEC-Q101 qualification, and 1.0 °C/W thermal resistance - making it the sole option for mission-critical surge protection where single-event energy and long-term reliability are non-negotiable.
Availability
MPLAD36KP28A is available at Aetrix Electronics and suitable for aircraft power distribution, automotive load dump protection, and industrial motor drive inputs requiring stable component supply across extended temperature ranges and high-reliability certifications.
Supply support for MPLAD36KP28A 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, mixed-signal, and power management solutions for aerospace, defense, and industrial markets.
The MPLAD36KP28A belongs to Microsemi's high-power PLAD-series TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where failure is not an option.
FAQ
What is the clamping voltage of the MPLAD36KP28A at its rated peak pulse current?
The MPLAD36KP28A exhibits a maximum clamping voltage (VC) of 46.4 V when subjected to its rated peak pulse current of 776 A under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and is critical for ensuring downstream ICs remain within their absolute maximum voltage ratings during surge events. The MPLAD36KP28A achieves this clamping performance while maintaining sub-100 ps response time.
Is the MPLAD36KP28A qualified for automotive applications?
Yes, the MPLAD36KP28A is explicitly tested and qualified to AEC-Q101 standards for stress reliability, confirming its suitability for automotive under-hood and safety-critical systems. It supports load-dump protection in 24 V architectures and meets IEC 61000-4-5 Class 4 requirements. The MPLAD36KP28A also offers optional upscreening per MIL-PRF-19500 for enhanced screening if required for mission-critical vehicle subsystems.
Does the MPLAD36KP28A meet DO-160 lightning protection requirements?
Yes, the MPLAD36KP28A is validated for RTCA DO-160 Section 22 multi-stroke lightning testing, a requirement for commercial aircraft power systems. It withstands repeated 36 kW surges without parameter shift or failure, and supports Level 4 and Level 5 pin injection per Waveforms 4 and 5A. The MPLAD36KP28A's thermal design and metal-base construction are integral to achieving this certification.
What is the thermal resistance and how should the MPLAD36KP28A be mounted for optimal cooling?
The MPLAD36KP28A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, achieved only when the metal base (cathode) is soldered to a large copper pad or heatsink per the recommended pad layout. Thermal resistance to ambient (RθJA) is 50 °C/W on FR4 with specified mounting pad. For sustained multi-pulse operation, the MPLAD36KP28A requires direct thermal coupling - not just standard SMT footprint - to maintain safe junction temperatures.
How does the MPLAD36KP28A differ from bidirectional variants like MPLAD36KP28CA?
The MPLAD36KP28A is unidirectional, with polarity marked by cathode on the metal base, and is optimized for DC bus protection where reverse voltage is blocked. The MPLAD36KP28CA is bidirectional, symmetrically clamping both polarities, and is used in AC-coupled or differential signal lines like RS-485. Both share identical PPP (36 kW), VWM (28 V), and thermal specs, but the MPLAD36KP28A cannot substitute for the CA version in AC or floating applications without risking reverse conduction.
MPLAD36KP28A 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 46.4V
- Current - Peak Pulse (10/1000µs):
- 776A
- 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
MPLAD36KP28A FAQ
1.How can I place an order for MPLAD36KP28A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP28A 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 MPLAD36KP28A reliable?
The price and inventory of MPLAD36KP28A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP28A is usually 5 days.
3.What payment methods are accepted for MPLAD36KP28A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP28A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP28A?
MPLAD36KP28A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP28A 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 MPLAD36KP28A?
For technical support, including MPLAD36KP28A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP28A requirements.
6.How does Aetrix verify that MPLAD36KP28A is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP28A 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 MPLAD36KP28A meets industry standards.
7.What is the process for return or replacement of MPLAD36KP28A?
All MPLAD36KP28A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP28A, 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 MPLAD36KP28A part is unused and in its original packaging.
Return procedure for MPLAD36KP28A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP28A Tags
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