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Microchip Technology MPLAD18KP43A
- Part No.:
- MPLAD18KP43A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,695
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Product details
Overview
MPLAD18KP43A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 18 kW peak pulse power at 10/1000 μs, clamps at ≤69.4 V under 260 A peak impulse current, and features a 43 V reverse standoff voltage (VWM) with 47.8–52.8 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for aircraft systems.
For engineers reviewing the MPLAD18KP43A datasheet, MPLAD18KP43A pinout, MPLAD18KP43A application, or MPLAD18KP43A equivalent, key selection criteria include its 43 V working voltage, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, IEC 61000-4-5 Class 4 secondary lightning protection (42 Ω source), and compatibility with FR4 PCB mounting per recommended pad layout.
Technical Context
The MPLAD18KP43A operates as a silicon avalanche diode optimized for fast-response clamping of high-amplitude transients. Its unidirectional polarity places the cathode on the metal baseplate, enabling direct thermal coupling to heatsinks. It exhibits <100 ps response time from 0 V to V(BR) min and maintains stable clamping up to 150 °C junction temperature.
Designed for multi-stroke lightning compliance (RTCA DO-160 Section 22), it supports duty factor ≤0.05% impulse repetition and derates linearly above 25 °C ambient per Figure 3. Steady-state dissipation is 2.5 W at TA = 25 °C and 71 W at TC = 100 °C, leveraging its low RθJC of 0.7 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous DC or peak AC voltage the device blocks without conduction. |
| V(BR) @ I(BR) | 47.8–52.8 V - Breakdown occurs within this range at specified test current, defining turn-on threshold. |
| VC @ IPP | ≤69.4 V @ 260 A - Clamping voltage during 10/1000 μs surge; ensures downstream circuit stays below safe overvoltage limit. |
| PPP | 18,000 W @ 10/1000 μs - Peak power handling capacity; validates suitability for lightning and load dump events. |
| RθJC | 0.7 °C/W - Enables efficient heat transfer from junction to case; critical for thermal management on heatsink-mounted designs. |
| ID @ VWM | ≤10 μA - Ultra-low leakage at rated standoff, minimizing standby power loss in battery-backed or low-power systems. |
| Package | Surface-mount PLAD - Void-free epoxy body (UL94V-0), tin-lead or RoHS e3 matte-tin terminals, 1 g mass. |
Pinout & Package
The MPLAD18KP43A uses a 2-terminal surface-mount PLAD package with the cathode electrically and thermally connected to the exposed metal baseplate (bottom side). Anode is accessible via top-side metallization. Mounting requires thermal pad connection to PCB copper pour or heatsink per documented pad layout (Ref. A1/A2/B/C/D dimensions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for unidirectional conduction path | Connected to protected line; conducts surge current toward cathode/baseplate when voltage exceeds V(BR). |
| Cathode (Baseplate) | Common reference and thermal interface | Electrically tied to system ground or chassis; serves as primary heat sink interface-must be soldered to large copper area. |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Validated for multi-stroke lightning (RTCA DO-160 Sec. 22) and automotive load dump without degradation. |
| Low RθJC = 0.7 °C/W | Enables >70 W steady-state dissipation at 100 °C case temperature-supports high-reliability thermal design. |
| AEC-Q101 qualified | Meets stress-test requirements for automotive electronics including HTGB, TCT, and HTRB-suitable for under-hood use. |
| RoHS e3 compliant plating | Matte-tin termination ensures reliable solderability per MIL-STD-750 Method 2026 and eliminates lead-based process concerns. |
| IEC 61000-4-5 Class 4 (42 Ω) | Withstands 4 kV surge with 42 Ω source impedance-meets industrial and avionics secondary protection standards. |
Applications
| Aircraft Power Distribution Units | Automotive Engine Control Modules |
|---|---|
Use Scenario: Protecting 28 V DC bus in airborne power distribution against lightning-induced surges per RTCA DO-160F Waveform 4 (6.4/69 μs). IC Role / Device Role / Timing Role: Primary transient clamp on main power rail; responds within <100 ps to limit voltage overshoot during fast-rising transients. Use Value: Ensures compliance with Level 4 pin injection testing while maintaining <69.4 V clamping to safeguard 36 V-rated downstream regulators and FPGAs. | Use Scenario: Safeguarding 12 V/24 V engine control unit inputs against ISO 7637-2 load dump spikes (up to 120 V, 400 ms). IC Role / Device Role / Timing Role: High-energy TVS placed at connector entry point; absorbs 18 kW pulses without failure across 1000+ surge cycles. Use Value: Eliminates need for series resistors or additional filtering by clamping at 69.4 V-preserving signal integrity and reducing BOM count. |
| Industrial Motor Drive DC Links | Railway Signaling Power Supplies |
Use Scenario: Protecting 48–60 V DC link capacitors in variable-frequency drives from switching-induced transients and IGBT commutation spikes. IC Role / Device Role / Timing Role: Unidirectional shunt protector mounted directly across bulk capacitor terminals; leverages metal baseplate for direct thermal coupling. Use Value: Sustains 260 A peak current at 69.4 V clamping-prevents capacitor overvoltage failure and extends system MTBF in harsh EMI environments. | Use Scenario: Securing 48 V signaling power supplies in EN 50121-3-2 compliant railway infrastructure against EFT bursts and lightning coupling. IC Role / Device Role / Timing Role: Secondary surge protector downstream of primary MOV stage; handles residual energy per IEC 61000-4-5 Class 4 (42 Ω source). Use Value: Provides precise 43 V standoff and low-leakage operation (<10 μA), ensuring no interference with 48 V logic-level monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | 600 W PPP rating (vs. 18,000 W); SMA package; RθJC ≈ 40 °C/W | Not suitable for lightning or load dump-limited to ESD/EFT only | Select only for low-energy board-level ESD protection where space constraints prohibit PLAD footprint. |
| SMCJ43A | 1500 W PPP; SMC package; RθJC ≈ 10 °C/W; no AEC-Q101 or DO-160 qualification | Lacks multi-stroke endurance and aviation-grade reliability screening | Acceptable for cost-sensitive industrial controls lacking formal lightning certification requirements. |
Compared with SMBJ43A and SMCJ43A, the MPLAD18KP43A delivers 30× and 12× higher peak pulse power respectively, enables direct heatsink mounting via baseplate, and carries full AEC-Q101 and RTCA DO-160F qualifications-making it the sole choice for certified aerospace and high-reliability automotive power protection.
Availability
MPLAD18KP43A is available at Aetrix Electronics and suitable for aircraft power distribution units, automotive engine control modules, and industrial motor drive DC links requiring stable component supply across extended production lifecycles.
Supply support for MPLAD18KP43A 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 ICs for aerospace, defense, and industrial markets.
The MPLAD18KP43A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load dump protection in safety-critical platforms where multi-stroke endurance and thermal robustness are mandatory.
FAQ
What is the maximum clamping voltage of the MPLAD18KP43A under rated surge conditions?
The MPLAD18KP43A has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 260 A under 10/1000 μs waveform conditions. This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Does the MPLAD18KP43A meet automotive qualification standards?
Yes, the MPLAD18KP43A is qualified to AEC-Q101, covering stress tests such as high-temperature gate bias (HTGB), temperature cycling (TCT), and high-temperature reverse bias (HTRB). This makes it suitable for under-hood automotive applications like engine control modules and battery management systems where reliability under thermal and electrical stress is critical.
How is thermal management implemented for the MPLAD18KP43A?
The MPLAD18KP43A uses its exposed metal baseplate as both cathode terminal and primary thermal interface. For effective cooling, the baseplate must be soldered to a large PCB copper pour or external heatsink. Its low junction-to-case thermal resistance of 0.7 °C/W enables 71 W steady-state dissipation at 100 °C case temperature-key for sustained surge duty cycles.
Is the MPLAD18KP43A compatible with lead-free reflow processes?
Yes, the MPLAD18KP43A supports lead-free assembly with a maximum solder temperature of 260 °C for 10 seconds, compliant with J-STD-020B Level 1 moisture sensitivity. RoHS-compliant versions carry the "e3" suffix and feature annealed matte-tin plating, ensuring reliable wetting and intermetallic formation during standard Pb-free reflow profiles.
What standards does the MPLAD18KP43A satisfy for lightning protection?
The MPLAD18KP43A satisfies RTCA DO-160F Section 22 for multi-stroke lightning, IEC 61000-4-5 Class 4 (42 Ω source impedance), and secondary lightning protection per IEC 61000-4-5 with 12 Ω and 2 Ω sources. It is explicitly listed for Level 4 pin injection (Waveform 4) and Level 4/5 Waveform 5A testing in the manufacturer's application notes.
MPLAD18KP43A 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 260A
- 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
MPLAD18KP43A FAQ
1.How can I place an order for MPLAD18KP43A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP43A 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 MPLAD18KP43A reliable?
The price and inventory of MPLAD18KP43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP43A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP43A?
MPLAD18KP43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP43A 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 MPLAD18KP43A?
For technical support, including MPLAD18KP43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP43A requirements.
6.How does Aetrix verify that MPLAD18KP43A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP43A 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 MPLAD18KP43A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP43A?
All MPLAD18KP43A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP43A, 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 MPLAD18KP43A part is unused and in its original packaging.
Return procedure for MPLAD18KP43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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