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Microchip Technology MPLAD18KP28CAE3
- Part No.:
- MPLAD18KP28CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP28CAE3.pdf
- Description:
- TVS DIODE 28VWM 45.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,762
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Product details
Overview
MPLAD18KP28CAE3 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤45.5 V under 396 A peak impulse current, and features a 28 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (31.1–34.4 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning protection.
For engineers reviewing the MPLAD18KP28CAE3 datasheet, MPLAD18KP28CAE3 pinout, MPLAD18KP28CAE3 application, or MPLAD18KP28CAE3 equivalent, key selection criteria include its bidirectional polarity, 28 V working voltage, 45.5 V max clamping at 396 A, low 0.7 °C/W junction-to-case thermal resistance, and RoHS-compliant e3 matte-tin plating - all critical for high-reliability DC bus and avionics interface protection.
Technical Context
This TVS diode employs an avalanche breakdown mechanism optimized for multi-stroke lightning transients per RTCA DO-160 Section 22 and repetitive surge events with ≤0.05% duty factor. Its void-free UL94V-0 epoxy package and metal-base cathode construction minimize thermal resistance and enable direct heatsinking via the case.
It operates across –55°C to +150°C junction temperature range and supports secondary lightning protection under IEC 61000-4-5 with 2 Ω, 12 Ω, and 42 Ω source impedances - validated for Class 2–4 (2 Ω), Class 1–4 (12 Ω), and Class 1–5 (42 Ω) - while maintaining <100 ps response time in unidirectional mode and <5 ns in bidirectional configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains full-rated surge energy without degradation under standard lightning waveform testing |
| Reverse Standoff Voltage (VWM) | 28 V - maximum continuous DC or peak AC voltage the device blocks before clamping begins |
| Breakdown Voltage (V(BR)) | 31.1–34.4 V @ I(BR) - guaranteed avalanche initiation window ensures predictable turn-on margin above VWM |
| Max Clamping Voltage (VC) | 45.5 V @ 396 A IPP - limits downstream voltage stress during worst-case 10/1000 μs surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink, critical for repeated surge duty |
| Steady-State Power Dissipation | 2.5 W @ TA = 25°C - defines safe continuous bias capability when used in low-duty-cycle protection circuits |
| Moisture Sensitivity Level | Level 1 (IPC/JEDEC J-STD-020B) - no dry-pack or baking required prior to reflow soldering |
Pinout & Package
Package: Surface-mount PLAD (Plastic Low-profile Anode/Cathode Design) with metal base cathode terminal. Dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), weight ≈1 g. Cathode is the exposed metal bottom surface; anode is top-side metallization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Bottom Metal Base | Cathode | Primary heat path and return node; must be connected to large copper pour or heatsink for thermal management |
| Top Metallization Pad | Anode | Signal/power input node; connects to protected line; requires controlled impedance trace routing |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Protects AC-coupled or floating DC lines against both polarities of transients without polarity dependency |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance |
| RTCA DO-160F Waveform 4 & 5A compliance | Meets Level 4 (6.4/69 μs) and Level 4 (40/120 μs) pin injection requirements for aircraft electronics |
| RoHS-compliant e3 matte-tin plating | Enables lead-free reflow compatibility and eliminates tin whisker risk in high-reliability assemblies |
| 3σ lot norm screening on ID | Ensures consistent standby leakage (<10 μA @ 28 V) across production lots for low-power system integrity |
Applications
| Aerospace Avionics Power Bus Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting 28 V DC distribution networks in commercial aircraft against DO-160 Section 22 lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across main power rail upstream of DC-DC converters and flight control modules. Use Value: Limits transient overvoltage to ≤45.5 V during 18 kW surges, preserving MIL-STD-704F compliance and preventing latch-up in downstream ASICs. |
Use Scenario: Safeguarding engine control units (ECUs) and body control modules (BCMs) during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary parallel surge suppressor on battery feed line, absorbing >1000 V spikes with sub-5 ns response. Use Value: Withstands 396 A peak current at 45.5 V clamping, eliminating need for series fusing and enabling single-device protection up to 120 V transients. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Interface Protection |
Use Scenario: Shielding IGBT gate drivers and current sensors on 400 V DC link rails from switching-induced voltage spikes and EFT coupling. IC Role / Device Role / Timing Role: Fast-response TVS mounted directly at DC link capacitor terminals to suppress dV/dt-induced ringing. Use Value: 0.7 °C/W RθJC enables sustained operation under repetitive 10/1000 μs surges at 0.05% duty cycle without thermal runaway. |
Use Scenario: Securing 72 V signaling lines in train communication networks against induced surges from traction motor commutation and lightning coupling. IC Role / Device Role / Timing Role: Bidirectional clamp installed on RS-485/ARINC 429 data lines entering EMI-shielded enclosures. Use Value: Meets IEC 61000-4-5 Class 4 (2 Ω source) with 45.5 V clamping, ensuring signal integrity remains intact below receiver damage threshold. |
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 SMAJ28CA | Lower PPP rating (400 W), smaller SMC package, higher RθJA (60 °C/W), no AEC-Q101 or DO-160 qualification | Suitable for consumer-grade 28 V DC inputs; insufficient for aerospace multi-stroke or automotive load dump | Select only for cost-sensitive, non-safety-critical 28 V protection where surge energy ≤400 W |
| Vishay V28MLA0603NH | MLA varistor-based, 28 V nominal, 1200 A peak, but slower response (>50 ns), no defined clamping voltage, non-avalanche behavior | Acceptable for basic ESD/EFT; unsuitable for precise clamping or fast-edge transients like DO-160 Waveform 4 | Prefer only when board space is constrained and clamping precision is secondary to cost and footprint |
Compared with SMAJ28CA and V28MLA0603NH, MPLAD18KP28CAE3 uniquely combines 18 kW surge capacity, sub-5 ns response, AEC-Q101/DO-160 qualification, and thermally optimized PLAD packaging - making it the sole option for certified high-energy, high-reliability 28 V bidirectional protection.
Availability
MPLAD18KP28CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive ECU, and industrial motor drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.
Supply support for MPLAD18KP28CAE3 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 radiation-hardened ICs for aerospace, defense, and industrial markets.
The MPLAD series was developed specifically for high-power, surface-mount transient suppression in mission-critical systems where thermal performance, multi-stroke endurance, and aviation-standard compliance are mandatory design requirements.
FAQ
What is the clamping voltage of MPLAD18KP28CAE3 at its rated peak pulse current?
The MPLAD18KP28CAE3 has a maximum clamping voltage (VC) of 45.5 V at 396 A peak pulse current (IPP) under the standard 10/1000 μs waveform. This value is measured with the device mounted on an FR4 PCB using the recommended pad layout and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events. The clamping performance is guaranteed across the full operating temperature range.
Is MPLAD18KP28CAE3 suitable for automotive load dump protection per ISO 7637-2?
Yes, MPLAD18KP28CAE3 is qualified for automotive load dump protection. Its 18,000 W peak pulse power rating, 45.5 V clamping at 396 A, and AEC-Q101 qualification confirm suitability for ISO 7637-2 Pulse 5a (load dump) events. It is commonly deployed on 12 V and 24 V battery feed lines in ECUs and BCMs where high-energy, bidirectional suppression is required without series impedance.
Does MPLAD18KP28CAE3 require special handling for moisture sensitivity?
No, MPLAD18KP28CAE3 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and does not require dry packing, baking, or special storage conditions prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related assembly risks such as popcorning or delamination.
How is thermal management implemented for MPLAD18KP28CAE3 in high-duty-cycle applications?
MPLAD18KP28CAE3 relies on its 0.7 °C/W junction-to-case thermal resistance and metal-base cathode for thermal conduction. Effective thermal management requires mounting the device's bottom metal surface onto a minimum 100 mm² copper pour (2 oz. thickness) or direct attachment to an external heatsink. Derating curves in Figure 3 show PPP reduction above 100°C case temperature, guiding layout for repetitive surge scenarios.
What standards does MPLAD18KP28CAE3 meet for aerospace applications?
MPLAD18KP28CAE3 meets RTCA DO-160F Section 22 for multi-stroke lightning protection (Level 4 pin injection for Waveforms 4 and 5A), IEC 61000-4-5 Class 1–5 secondary lightning protection (with 2/12/42 Ω source impedances), and ESD/EFT immunity per IEC 61000-4-2 and IEC 61000-4-4. These certifications are documented in Microsemi's RF01215 datasheet Rev B.
MPLAD18KP28CAE3 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.5V
- Current - Peak Pulse (10/1000µs):
- 396A
- Power - Peak Pulse:
- 18000W (18kW)
- 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
MPLAD18KP28CAE3 FAQ
1.How can I place an order for MPLAD18KP28CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP28CAE3 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 MPLAD18KP28CAE3 reliable?
The price and inventory of MPLAD18KP28CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP28CAE3 is usually 5 days.
3.What payment methods are accepted for MPLAD18KP28CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP28CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP28CAE3?
MPLAD18KP28CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP28CAE3 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 MPLAD18KP28CAE3?
For technical support, including MPLAD18KP28CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP28CAE3 requirements.
6.How does Aetrix verify that MPLAD18KP28CAE3 is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP28CAE3 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 MPLAD18KP28CAE3 meets industry standards.
7.What is the process for return or replacement of MPLAD18KP28CAE3?
All MPLAD18KP28CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP28CAE3, 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 MPLAD18KP28CAE3 part is unused and in its original packaging.
Return procedure for MPLAD18KP28CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP28CAE3 Tags
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