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Microchip Technology MAPLAD18KP28CA
- Part No.:
- MAPLAD18KP28CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP28CA.pdf
- Description:
- TVS DIODE 28VWM 45.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
MAPLAD18KP28CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial 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 for Waveform 4.
For engineers reviewing the MAPLAD18KP28CA datasheet, MAPLAD18KP28CA pinout, MAPLAD18KP28CA application, or MAPLAD18KP28CA equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), ESD/EFT immunity per IEC 61000-4-2/4-4, and multi-stroke lightning compliance per RTCA DO-160 Section 22 - critical for avionics power bus and vehicle ECU input protection.
Technical Context
The MAPLAD18KP28CA employs an avalanche diode structure optimized for low clamping ratio (VC/V(BR) ≈ 1.45) and sub-5 ns response time, enabling fast suppression of induced transients from load dump, inductive switching, and lightning-induced surges. Its metal-base thermal design achieves 0.7 °C/W junction-to-case thermal resistance, supporting high-repetition-rate surge handling when mounted on heatsinked PCB pads.
It operates across –55 °C to +150 °C junction temperature range and maintains stable V(BR) with a +30 mV/°C temperature coefficient. Bidirectional symmetry ensures equal clamping performance for positive and negative transients, eliminating polarity concerns in AC-coupled or floating signal lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous DC or peak AC voltage the device blocks without conduction. |
| V(BR) min/max | 31.1–34.4 V @ I(BR) - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC @ IPP | ≤45.5 V @ 396 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to safe levels. |
| PPP | 18,000 W @ 10/1000 μs - Peak power dissipation capability; enables single-device protection against severe lightning surges. |
| ID @ VWM | ≤10 μA - Ultra-low leakage at rated standoff; prevents unwanted loading of sensitive 28 V sensor or control circuits. |
| RθJC | 0.7 °C/W - Low thermal resistance from junction to case; allows efficient heat transfer to PCB copper or heatsink. |
| TJ Range | –55 to +150 °C - Full military-grade operating temperature envelope for under-hood and avionics deployment. |
Pinout & Package
MAPLAD18KP28CA uses a surface-mount, low-profile plastic package with metal baseplate (cathode for unidirectional variants; symmetric bidirectional terminals). The device has two terminals: Anode and Cathode marked on body; for bidirectional operation, both terminals behave identically under reverse or forward surge conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (positive transient) | Accepts positive-going transients; connects to protected line (e.g., 28 V bus or signal line). |
| Cathode | Surge current return (negative transient) | Provides low-impedance path to ground or reference; metal baseplate serves as primary thermal interface. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetrical protection on AC, differential, or floating lines without polarity constraints. |
| RTCA DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin injection at 25 °C - required for commercial aircraft power input stages. |
| IEC 61000-4-5 Class 4 support (42 Ω, 12 Ω, 2 Ω) | Meets secondary lightning immunity up to 4 kV test level across multiple source impedances. |
| MIL-PRF-19500 upscreening option | Supports high-reliability screening (M, MA, MX, MXL levels) for space-qualified or mission-critical programs. |
| RoHS-compliant e3 plating | Matte-tin terminations ensure lead-free solder compatibility and long-term intermetallic stability. |
Applications
| Aerospace Power Bus Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: 28 V DC power distribution in commercial aircraft avionics bays exposed to lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary TVS clamp on main 28 V bus input, placed upstream of DC-DC converters and flight control modules. Use Value: Limits transient overvoltage to ≤45.5 V during 18 kW surges, preventing latch-up or damage to MIL-STD-704-compliant power supplies. | Use Scenario: 24 V/28 V battery-fed engine control units subjected to ISO 7637-2 Pulse 5a (load dump) events up to 60 V/100 ms. IC Role / Device Role / Timing Role: High-power shunt protector across battery input, triggered within <5 ns to divert >396 A surge current. Use Value: Eliminates need for series fusing or derated MOSFETs by absorbing full load dump energy without degradation. |
| Industrial Motor Drive I/O Protection | Railway Signaling Interface Protection |
Use Scenario: Digital I/O and encoder feedback lines in variable-frequency drives operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Bidirectional TVS on RS-422/485 differential pairs and 24 V sensor inputs to suppress EFT bursts and inductive kickback. Use Value: Maintains signal integrity under IEC 61000-4-4 Level 4 (4 kV) bursts while adding <10 μA leakage at 28 V nominal. | Use Scenario: 28 V DC signaling interfaces in railway signaling cabinets exposed to traction-induced surges and lightning coupling. IC Role / Device Role / Timing Role: Secondary surge protector on track-side controller Ethernet and relay driver outputs per EN 50121-4. Use Value: Provides certified IEC 61000-4-5 Class 4 immunity (4 kV, 42 Ω source) without requiring external spark gaps or varistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA | 600 W PPP rating (vs. 18,000 W); same VWM and bidirectional polarity; SMC package. | Limited to low-energy ESD/EFT; unsuitable for lightning or load dump. | Select SMBJ28CA only for board-level ESD protection where surge energy <10 J. |
| SMCJ28CA | 1500 W PPP rating; same VWM and package footprint; lower clamping (VC = 48.4 V @ 31 A). | Applicable for moderate surges (e.g., IEC 61000-4-5 Class 2), but fails Class 4 testing. | Choose SMCJ28CA when cost sensitivity outweighs need for DO-160 or multi-stroke lightning compliance. |
Compared with SMBJ28CA and SMCJ28CA, MAPLAD18KP28CA delivers 30× and 12× higher peak pulse power respectively, enabling single-device compliance with RTCA DO-160F Level 4 and IEC 61000-4-5 Class 4 - essential for safety-critical aerospace and heavy-duty automotive systems where cascaded protection adds failure modes and board space.
Availability
MAPLAD18KP28CA is available at Aetrix Electronics and suitable for aerospace power bus protection, automotive load dump suppression, and industrial motor drive I/O protection requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP28CA 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) designs high-reliability analog, mixed-signal, and power semiconductors for aerospace, defense, and industrial markets.
The MPLAD18KP family was developed specifically for high-energy transient suppression in safety-critical platforms - emphasizing multi-stroke lightning resilience, AEC-Q101 qualification, and thermal robustness in surface-mount form.
FAQ
What is the clamping voltage of MAPLAD18KP28CA under maximum rated surge current?
The MAPLAD18KP28CA exhibits a maximum clamping voltage (VC) of 45.5 V when subjected to its rated peak pulse current of 396 A under the standard 10/1000 μs waveform. This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Is MAPLAD18KP28CA qualified for automotive applications?
Yes, MAPLAD18KP28CA is AEC-Q101 qualified and explicitly rated for automotive load dump protection per ISO 7637-2 Pulse 5a. Its 28 V VWM, 18,000 W PPP rating, and bidirectional construction make it suitable for 24 V/28 V battery rail protection in ECUs, ADAS modules, and powertrain controllers.
Does MAPLAD18KP28CA meet RTCA DO-160 lightning standards?
Yes, MAPLAD18KP28CA is validated for RTCA DO-160 Section 22 multi-stroke lightning testing and supports Pin Injection Waveform 4 Level 4 (6.4/69 μs) at 25 °C. It is also specified for secondary lightning protection per IEC 61000-4-5 across 42 Ω, 12 Ω, and 2 Ω source impedances - fulfilling key avionics certification requirements.
What is the thermal resistance and recommended mounting for MAPLAD18KP28CA?
MAPLAD18KP28CA has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. It must be mounted on FR4 PCB using the recommended pad layout (per RF01215 Rev B) with the metal baseplate thermally connected to large copper areas or an external heatsink to sustain repeated 18 kW surges without thermal runaway.
How does the bidirectional construction of MAPLAD18KP28CA affect circuit design?
The bidirectional construction of MAPLAD18KP28CA eliminates polarity sensitivity, allowing placement on AC-coupled lines, differential buses (e.g., RS-485), or floating sensor inputs without orientation checks. Unlike unidirectional TVS diodes, MAPLAD18KP28CA clamps equally for both positive and negative transients - simplifying layout and reducing BOM variants.
MAPLAD18KP28CA 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
MAPLAD18KP28CA FAQ
1.How can I place an order for MAPLAD18KP28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP28CA 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 MAPLAD18KP28CA reliable?
The price and inventory of MAPLAD18KP28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP28CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP28CA?
MAPLAD18KP28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP28CA 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 MAPLAD18KP28CA?
For technical support, including MAPLAD18KP28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP28CA requirements.
6.How does Aetrix verify that MAPLAD18KP28CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP28CA 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 MAPLAD18KP28CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP28CA?
All MAPLAD18KP28CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP28CA, 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 MAPLAD18KP28CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP28CA Tags
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