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Microchip Technology MPLAD18KP26A
- Part No.:
- MPLAD18KP26A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,841
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Product details
Overview
MPLAD18KP26A 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 18,000 W peak pulse power at 10/1000 μs, features a 26 V reverse standoff voltage (VWM), clamps to ≤42.1 V at 428 A peak impulse current (IPP), and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation in lightning and load dump protection circuits.
For engineers reviewing the MPLAD18KP26A datasheet, MPLAD18KP26A pinout, MPLAD18KP26A application, or MPLAD18KP26A equivalent, this device is selected for its verified RTCA DO-160F Waveform 4 Level 4 compliance, IEC 61000-4-5 Class 1–5 secondary lightning protection capability, and AEC-Q101 qualification - critical for avionics power input stages, battery management systems, and DC bus interfaces requiring multi-stroke robustness.
Technical Context
The MPLAD18KP26A employs an avalanche diode structure optimized for low clamping ratio (VC/VWM ≈ 1.62) and sub-100 ps response time, enabling effective suppression of fast-rising transients such as ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and induced RFI. Its metal-base cathode construction provides direct thermal path to PCB copper, supporting high-reliability mounting on FR4 with recommended pad layout per RF01215 Rev B.
Rated for -55°C to +150°C operation, it meets MIL-PRF-19500 screening options (M/MA/MXL) and is RoHS compliant (e3 marking). Standby current ID is ≤10 μA at 26 V, and breakdown voltage V(BR) is specified at 28.9–31.9 V @ I(BR), ensuring stable threshold behavior across temperature and lot variance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains multi-stroke lightning surges without degradation under 0.05% duty cycle. |
| Reverse Standoff Voltage (VWM) | 26 V - maximum continuous DC or peak AC voltage before conduction; matches 24 V nominal systems. |
| Clamping Voltage (VC) | ≤42.1 V @ IPP = 428 A - limits downstream voltage stress during worst-case surge events. |
| Breakdown Voltage (V(BR)) | 28.9–31.9 V @ I(BR) - defines precise avalanche onset; ensures predictable turn-on margin above VWM. |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct heat transfer to heatsink or large copper pour, critical for sustained surge handling. |
| Standby Current (ID) | ≤10 μA @ 26 V - negligible leakage in standby, preserving system efficiency and battery life. |
| Response Time | <100 ps - suppresses nanosecond-scale transients before sensitive circuitry reacts. |
Pinout & Package
Package: Surface-mount PLAD (Power Low-Profile Avalanche Diode) with metal base cathode terminal; void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; weight ≈1 g; dimensions 12.32 × 10.54 × 3.68 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Surface Pad) | Transient current entry point during reverse-biased surge | Connected to protected line (e.g., 24 V rail); requires low-inductance trace routing. |
| Cathode (Metal Base) | Current return path and primary thermal interface | Must be soldered directly to large copper area or heatsink; serves as both electrical and thermal ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin injection at 25°C - essential for aircraft power distribution units. |
| IEC 61000-4-5 Class 1–5 secondary lightning protection | Tested with 42 Ω source impedance up to 4 kV - meets stringent industrial and transportation surge immunity standards. |
| AEC-Q101 qualification | Qualified for automotive underhood applications including alternator load dump and battery disconnect transients. |
| Moisture Sensitivity Level 1 | No dry pack required per J-STD-020B - simplifies SMT assembly and reduces handling cost. |
| 3σ lot norm screening on ID | Ensures consistent low-leakage performance across production lots for mission-critical reliability. |
Applications
| Aerospace Power Input Protection | Automotive Battery Management |
|---|---|
Use Scenario: 28 V DC power input stage of flight control computer subjected to RTCA DO-160 Section 22 lightning-induced surges. IC Role / Device Role / Timing Role: Primary transient clamp on main power rail; absorbs multi-stroke energy without failure. Use Value: Enables compliance with DO-160F Waveform 4 Level 4 (6.4/69 μs) while maintaining <10 μA leakage at 26 V operating voltage. |
Use Scenario: Protection of BMS microcontroller supply rail against 12 V/24 V alternator load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and LDO input to limit voltage excursion during sudden load removal. Use Value: Clamps to ≤42.1 V at 428 A, preventing overvoltage damage to 5 V logic while surviving AEC-Q101 stress profiles. |
| Industrial DC Bus Interface | Railway Signaling Power Supply |
Use Scenario: 24 V DC bus in programmable logic controller exposed to switching transients from relay coils and motor drives. IC Role / Device Role / Timing Role: Fast-response surge suppressor bridging bus to chassis ground, coordinated with upstream fuse and downstream filtering. Use Value: Sub-100 ps response and 18 kW PPP rating suppress 10/1000 μs transients without derating at ambient ≤100°C. |
Use Scenario: 24 V auxiliary power supply in train signaling cabinet subjected to IEC 61000-4-5 Class 4 surges (4 kV, 42 Ω source). IC Role / Device Role / Timing Role: Secondary lightning protector on isolated DC output, downstream of isolation transformer and upstream of regulator. Use Value: Validated for Class 1–5 secondary protection per IEC 61000-4-5 - eliminates need for additional series impedance or staged clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26A (onsemi) | Lower PPP rating (600 W), DO-214AA package, RθJC ≈ 15 °C/W - less effective for multi-stroke lightning. | Limited to single-event surges in consumer-grade industrial controls; not qualified for DO-160 or AEC-Q101. | Select when cost sensitivity outweighs multi-stroke robustness and aerospace/automotive qualification requirements. |
| SMCJ26A (Littelfuse) | 1500 W PPP, SMC package, VWM = 26 V, VC = 42.1 V - same clamping but 12× lower energy capacity. | Suitable for basic IEC 61000-4-4/5 Class 3 protection; lacks RTCA DO-160F validation and thermal performance for sustained surges. | Choose only for non-safety-critical 24 V systems where surge repetition rate is negligible and heatsinking is constrained. |
Compared with SMBJ26A and SMCJ26A, the MPLAD18KP26A delivers 30× higher peak pulse power and certified DO-160F/AEC-Q101 compliance - making it the sole option for aviation power inputs and automotive underhood applications demanding validated multi-stroke endurance and low thermal resistance.
Availability
MPLAD18KP26A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive battery management, and industrial DC bus protection requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical designs.
Supply support for MPLAD18KP26A 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 MPLAD18KP26A belongs to Microsemi's high-power PLAD family, engineered specifically for multi-stroke lightning and load dump protection in mission-critical power systems where thermal performance, qualification rigor, and surge repeatability are non-negotiable.
FAQ
What is the clamping voltage of MPLAD18KP26A at its rated peak pulse current?
The MPLAD18KP26A has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak impulse current (IPP) of 428 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream circuitry remains within safe voltage limits during worst-case surge events. The clamping performance is guaranteed across the full operating temperature range and validated in production surge testing.
Is MPLAD18KP26A qualified for automotive applications?
Yes, the MPLAD18KP26A is AEC-Q101 qualified, confirming its suitability for automotive underhood environments including alternator load dump and battery disconnect transients. It meets the mechanical, thermal, and electrical stress requirements defined in the AEC-Q101 standard, and its 0.7 °C/W RθJC supports reliable operation at elevated underhood temperatures. This qualification is documented in the RF01215 datasheet and supported by lot-level traceability.
Does MPLAD18KP26A meet RTCA DO-160F lightning protection requirements?
Yes, the MPLAD18KP26A is validated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 pin injection testing at 25°C, as stated in RF01215 Rev B. It also satisfies Waveform 5A Level 4 up to 36 V standoff variants. This makes it appropriate for aircraft power input stages, avionics boxes, and other airborne systems requiring certified lightning-induced transient immunity without external conditioning networks.
What is the thermal resistance and how does it affect PCB layout for MPLAD18KP26A?
The MPLAD18KP26A has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W, meaning each watt of surge power raises the junction temperature by only 0.7°C above the case temperature. To leverage this, the metal base (cathode) must be soldered to a large copper area or external heatsink - per the recommended pad layout in RF01215 Rev B - to maintain junction temperature below 150°C during repeated 18 kW pulses. Inadequate copper area increases effective RθJA and risks thermal runaway.
How does MPLAD18KP26A differ from standard SMB/SMC TVS diodes in surge handling capability?
The MPLAD18KP26A delivers 18,000 W peak pulse power - 30× higher than SMBJ26A (600 W) and 12× higher than SMCJ26A (1500 W). Its PLAD package features a metal base cathode for direct thermal conduction, achieving RθJC = 0.7 °C/W versus ~15 °C/W for SMB/SMC packages. This enables true multi-stroke survivability per RTCA DO-160 and IEC 61000-4-5 Class 4–5, whereas standard packages degrade after one or two surges at rated power.
MPLAD18KP26A 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 428A
- 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
MPLAD18KP26A FAQ
1.How can I place an order for MPLAD18KP26A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP26A 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 MPLAD18KP26A reliable?
The price and inventory of MPLAD18KP26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP26A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP26A?
MPLAD18KP26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP26A 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 MPLAD18KP26A?
For technical support, including MPLAD18KP26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP26A requirements.
6.How does Aetrix verify that MPLAD18KP26A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP26A 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 MPLAD18KP26A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP26A?
All MPLAD18KP26A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP26A, 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 MPLAD18KP26A part is unused and in its original packaging.
Return procedure for MPLAD18KP26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP26A Tags
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