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Microchip Technology MPLAD18KP45A
- Part No.:
- MPLAD18KP45A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP45A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
MPLAD18KP45A 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, clamps at ≤72.7 V under 248 A peak impulse current, and features a 45 V reverse standoff voltage (VWM) with 50–55.3 V breakdown range (V(BR)). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.
For engineers reviewing the MPLAD18KP45A datasheet, MPLAD18KP45A pinout, MPLAD18KP45A application, or MPLAD18KP45A equivalent, this device is selected for lightning robustness in avionics power rails, load-dump immunity in 24 V vehicle ECUs, and secondary IEC 61000-4-5 Class 3/4 protection with 42 Ω source impedance - requiring precise VWM margining, thermal derating awareness, and cathode-side PCB layout planning.
Technical Context
The MPLAD18KP45A employs a silicon avalanche diode structure optimized for low clamping ratio (VC/V(BR) ≈ 1.39) and sub-100 ps response time. Its metal-base package enables direct thermal coupling to heatsinks, achieving 0.7 °C/W junction-to-case thermal resistance and supporting sustained operation up to +150 °C junction temperature.
It is rated for multi-stroke lightning compliance per RTCA DO-160 Section 22 and passes IEC 61000-4-2 ESD (±30 kV air), IEC 61000-4-4 EFT (40 A), and IEC 61000-4-5 surge (42 Ω source, Class 1–5). Standby leakage is limited to 10 μA at 45 V, ensuring minimal system quiescent loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains full-rated surge without degradation under single-event or low-duty-cycle (<0.05%) repetition |
| Reverse Standoff Voltage (VWM) | 45 V - maximum continuous DC or peak AC voltage before significant leakage; sets minimum operating rail margin |
| Breakdown Voltage (V(BR)) | 50.0–55.3 V @ I(BR) - defines onset of avalanche conduction; used to verify design margin against clamping threshold |
| Max Clamping Voltage (VC) | 72.7 V @ 248 A - maximum voltage seen by protected circuit during worst-case 10/1000 μs surge |
| Standby Current (ID) | 10 μA @ 45 V - negligible leakage at rated standoff, critical for battery-backed or low-power sensor rails |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct mounting to copper pour or heatsink for thermal management in high-reliability power stages |
| Clamping Response Time | <100 ps - ensures protection of fast-edge digital interfaces and gate drivers against nanosecond transients |
Pinout & Package
Package: Surface-mount PLAD (Power Leadless Array Device) with metal base cathode termination. Void-free UL94V-0 epoxy body (12.32 × 10.54 × 5.33 mm max), matte-tin plated terminals, polarity marked by cathode on bottom metal surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface pad) | Transient current entry point for unidirectional operation | Connected to line/rail being protected; must be routed with low-inductance trace to minimize overshoot |
| Cathode (metal base) | Current return path and primary thermal interface | Must be soldered directly to large copper area or heatsink; serves as both electrical return and thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating with 0.7 °C/W RθJC | Enables compact placement on high-current power rails without external heatsink in many 24–48 V systems |
| AEC-Q101 qualified and RTCA DO-160F Level 4 compliant | Validated for automotive ECU and avionics power supply use without additional qualification testing |
| RoHS-compliant e3 plating and IPC/JEDEC J-STD-020B Level 1 moisture sensitivity | Eliminates dry-pack requirement and supports standard SMT reflow profiles (260 °C, 10 s) |
| Low-profile 5.33 mm max height | Fits within tight mechanical envelopes typical of flight control modules and engine control units |
| Traceable wafer and assembly lots | Supports full lot-level failure analysis and reliability reporting for DO-254/DO-178 safety-critical programs |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 28 V DC bus in flight control actuator power supplies against lightning-induced surges per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient shunt element placed at bus input, clamping transients before they reach downstream DC/DC converters and FPGAs. Use Value: Enables compliance with Level 4 pin injection (Waveform 4) and multi-stroke lightning without derating - verified across -55 °C to +125 °C operating range. |
Use Scenario: Load-dump suppression on 12 V/24 V battery-fed microcontroller power rails in diesel engine ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS mounted between battery rail and LDO input, absorbing 120 V/400 ms transients per ISO 7637-2 Pulse 5a. Use Value: Withstands 248 A peak current at 72.7 V clamping, limiting stress on downstream regulators and preserving MCU reset integrity during cranking events. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Interface |
Use Scenario: Secondary surge protection on 400 V DC link of variable-frequency drives exposed to switching transients and induced RFI. IC Role / Device Role / Timing Role: Parallel-mounted TVS across DC bus capacitors, triggered only during >100 V overvoltage events to avoid steady-state conduction. Use Value: 10 μA leakage at 45 V standoff ensures no measurable impact on bus efficiency; 18 kW rating handles repetitive IGBT turn-off spikes. |
Use Scenario: IEC 61000-4-5 Class 4 surge protection (4 kV, 42 Ω source) on 72 V signaling power inputs in trackside interlocking cabinets. IC Role / Device Role / Timing Role: First-stage protector upstream of isolated DC/DC converter, clamping to <73 V to preserve isolation barrier withstand rating. Use Value: Validated for 42 Ω source impedance Class 1–5 per datasheet table - eliminates need for external series impedance matching networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A (onsemi) | 600 W rating, 70 V clamping @ 6.5 A, SMB package, RθJA = 50 °C/W | Lower energy handling; suitable only for single-event, low-repetition surges in non-aerospace environments | Select when cost and board space constrain requirements and surge duty cycle remains <0.001%. |
| SMCJ45A (Littelfuse) | 1500 W rating, 70 V clamping @ 21.3 A, SMC package, RθJA = 25 °C/W | Lacks RTCA DO-160F validation and AEC-Q101 qualification; not rated for multi-stroke lightning | Use where IEC 61000-4-5 Class 3 compliance suffices and aerospace certification is not required. |
Compared with SMBJ45A and SMCJ45A, the MPLAD18KP45A provides 30× higher peak power, certified multi-stroke lightning endurance, and direct thermal path to PCB - making it irreplaceable in avionics and high-reliability automotive power protection where single-point failure is unacceptable.
Availability
MPLAD18KP45A is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU load-dump protection, and industrial motor drive DC bus applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MPLAD18KP45A 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MPLAD18KP45A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning resilience and thermal survivability in mission-critical power interfaces.
FAQ
What is the maximum clamping voltage of the MPLAD18KP45A under rated surge conditions?
The MPLAD18KP45A has a maximum clamping voltage (VC) of 72.7 V at 248 A peak pulse current under the standard 10/1000 μs waveform. This value is measured at 25 °C and represents the upper limit of voltage imposed on the protected circuit during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the MPLAD18KP45A suitable for bidirectional signal line protection?
No, the MPLAD18KP45A is unidirectional and intended only for DC power rail protection. Its cathode is the metal base, and it conducts only when the anode is positive relative to cathode. For bidirectional protection, the MPLAD18KP45CA variant must be used - the "CA" suffix explicitly denotes bidirectional construction with symmetrical clamping in both polarities.
Does the MPLAD18KP45A require a heatsink for continuous operation?
The MPLAD18KP45A does not require an external heatsink for single-pulse or low-duty-cycle (<0.05%) surge events due to its 0.7 °C/W junction-to-case thermal resistance. However, for repeated surges or elevated ambient temperatures, thermal design must include ≥25 cm² of 2 oz copper connected to the cathode base to maintain TJ ≤150 °C - verified via derating curve in Figure 3 of RF01215 Rev B.
How is polarity identified on the MPLAD18KP45A package?
Polarity is defined by physical construction: the cathode is the entire metal base (bottom surface) of the MPLAD18KP45A, while the anode is the top-side metallized pad. The device body is marked with the full part number, and no additional polarity marking is applied - correct orientation requires the metal base to be soldered to the system ground or return plane, with the top pad connected to the line being protected.
Can the MPLAD18KP45A be used in RoHS-compliant manufacturing processes?
Yes, the MPLAD18KP45A is offered in RoHS-compliant version with "e3" matte-tin plating (per JESD201A Class 1A), fully compatible with lead-free reflow profiles. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, meaning it can be stored indefinitely at ambient conditions and processed using standard 260 °C peak temperature (10 s) reflow without baking.
MPLAD18KP45A 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 248A
- 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
MPLAD18KP45A FAQ
1.How can I place an order for MPLAD18KP45A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP45A 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 MPLAD18KP45A reliable?
The price and inventory of MPLAD18KP45A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP45A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP45A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP45A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP45A?
MPLAD18KP45A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP45A 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 MPLAD18KP45A?
For technical support, including MPLAD18KP45A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP45A requirements.
6.How does Aetrix verify that MPLAD18KP45A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP45A 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 MPLAD18KP45A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP45A?
All MPLAD18KP45A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP45A, 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 MPLAD18KP45A part is unused and in its original packaging.
Return procedure for MPLAD18KP45A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP45A Tags
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