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Microchip Technology MPLAD18KP75A
- Part No.:
- MPLAD18KP75A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP75A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,439
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Product details
Overview
MPLAD18KP75A 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 18,000 W peak pulse power at 10/1000 μs, clamps at ≤121 V under 149 A peak impulse current, and features a 75 V reverse standoff voltage (VWM) with 83.3–92.1 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 MPLAD18KP75A datasheet, MPLAD18KP75A pinout, MPLAD18KP75A application, or MPLAD18KP75A equivalent, this device is selected for lightning robustness, low thermal resistance (RθJC = 0.7 °C/W), and secondary IEC 61000-4-5 compliance with 42 Ω source impedance - critical for avionics power input stages, battery management systems, and DC bus protection where multi-stroke surge resilience is mandatory.
Technical Context
The MPLAD18KP75A employs a silicon avalanche diode structure optimized for fast response (<5 ns clamping delay) and high cumulative energy handling. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under repetitive transients at ≤0.05% duty factor per MIL-STD-750 test conditions.
It is characterized for bidirectional variants (suffix CA) but the MPLAD18KP75A is strictly unidirectional, with cathode on the metal base - requiring correct PCB orientation for polarity-sensitive DC systems. Standby leakage is limited to 10 μA at 75 V, ensuring minimal quiescent loss in always-on power circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains single lightning surges up to 149 A without failure |
| Reverse Standoff Voltage (VWM) | 75 V - maximum continuous DC or peak AC voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 83.3–92.1 V @ I(BR) - defines reliable avalanche onset threshold across temperature |
| Max Clamping Voltage (VC) | 121 V @ 149 A - limits downstream component stress during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink or copper pour |
| Standby Leakage Current | 10 μA @ 75 V - negligible power loss in standby mode for battery-powered systems |
| Clamping Response Time | <5 ns - ensures protection before sensitive ICs experience overvoltage damage |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode termination. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Void-free UL94V-0 epoxy body; matte-tin plating compliant with MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top side pad) | Positive terminal for unidirectional conduction | Connected to protected line; conducts only when line exceeds VWM + margin |
| Cathode (metal base) | Negative reference / heat sink interface | Must be soldered to large copper area or heatsink; serves as both electrical return and primary thermal path |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating | Enables single-device protection against RTCA DO-160 Section 22 multi-stroke lightning events |
| AEC-Q101 qualification | Validated reliability for automotive under-hood and battery disconnect applications |
| 0.7 °C/W RθJC | Reduces junction temperature rise by >70% vs. standard SMC packages under identical surge load |
| IEC 61000-4-5 Class 4 compliance (42 Ω) | Meets secondary lightning immunity for industrial PLC backplanes and motor drives |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for automated assembly |
Applications
| Aircraft Power Input Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: 28 V DC aircraft avionics power entry subjected to DO-160F Waveform 4 (6.4/69 μs) lightning-induced transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and flight control modules. Use Value: Limits transient voltage to ≤121 V, preventing latch-up or gate oxide rupture in downstream SiC MOSFET drivers and microcontrollers. | Use Scenario: 12 V/24 V vehicle battery rail exposed to ISO 7637-2 Load Dump pulses (up to 120 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy directly to chassis ground via metal base. Use Value: Absorbs 18 kW peak power without degradation, maintaining <10 μA leakage to preserve battery standby life. |
| Industrial DC Bus Protection | Renewable Energy Inverter DC Link |
Use Scenario: 75 V nominal DC bus in factory automation drives subjected to IEC 61000-4-5 surge coupling via long cable runs. IC Role / Device Role / Timing Role: Secondary protection stage after MOVs, providing precise clamping and fast response. Use Value: Clamps at 121 V with <5 ns latency, protecting IGBT gate drivers and isolated feedback sensors from overshoot. | Use Scenario: Solar string combiner box DC link (75–100 V) facing induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: High-reliability TVS mounted directly on bus bar with thermal interface to enclosure. Use Value: Withstands repeated 10/1000 μs surges at 0.05% duty cycle, extending system MTBF in coastal wind/solar farms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | 600 W rating, 1.5 kW max; 5x lower peak power than MPLAD18KP75A | Only suitable for low-energy ESD/EFT, not lightning or load dump | Select only for cost-sensitive consumer electronics with sub-100 A surge exposure |
| SMCJ75A | 1500 W rating; same footprint but no metal base - RθJC = 3.5 °C/W vs. 0.7 °C/W | Limited to single-event surges; cannot sustain repetitive 10/1000 μs transients | Acceptable for non-aerospace industrial use where thermal cycling is infrequent |
Compared with SMBJ75A and SMCJ75A, the MPLAD18KP75A provides 12× and 12× higher peak power respectively, coupled with 5× better thermal resistance - making it the sole option for DO-160F-compliant avionics and automotive Grade 0 load dump protection where multi-stroke endurance is non-negotiable.
Availability
MPLAD18KP75A is available at Aetrix Electronics and suitable for aircraft power distribution units, automotive battery management systems, industrial DC drive controllers, and renewable energy inverters requiring stable component supply across extended product lifecycles.
Supply support for MPLAD18KP75A 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 MPLAD series was developed specifically for high-power, surface-mount transient suppression in mission-critical platforms where thermal performance, surge repetition capability, and aviation qualification are mandatory.
FAQ
What is the clamping voltage of the MPLAD18KP75A at its rated peak pulse current?
The MPLAD18KP75A has a maximum clamping voltage (VC) of 121 V at 149 A peak pulse current (IPP), measured under standardized 10/1000 μs waveform conditions. This value ensures downstream circuitry remains within safe operating voltage limits during worst-case surge events. The MPLAD18KP75A maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the MPLAD18KP75A suitable for bidirectional signal line protection?
No - the MPLAD18KP75A is a unidirectional TVS diode, intended exclusively for DC power rail protection where polarity is fixed. For bidirectional AC or data line protection, the MPLAD18KP75CA variant must be used. Using the MPLAD18KP75A on bidirectional lines risks catastrophic failure due to reverse conduction during negative half-cycles.
Does the MPLAD18KP75A require a heatsink for standard operation?
The MPLAD18KP75A does not require an external heatsink for single-event surge suppression, but its metal base must be soldered to ≥250 mm² of 2 oz copper for effective thermal dissipation during repetitive surges. Its 0.7 °C/W junction-to-case resistance relies on this PCB thermal interface; omitting adequate copper area will cause junction overheating and premature wear-out under multi-stroke conditions.
What certifications does the MPLAD18KP75A meet for aerospace applications?
The MPLAD18KP75A meets RTCA DO-160F Section 22 lightning-induced transient requirements (Waveform 4, Level 4) and is AEC-Q101 qualified. It also complies with IEC 61000-4-5 for secondary lightning protection using 42 Ω source impedance (Class 1–5). These certifications are verified per Microsemi's internal test reports aligned with the RF01215 Rev B specification document.
Can the MPLAD18KP75A replace older PLAD-series TVS devices in existing designs?
Yes - the MPLAD18KP75A is a direct replacement for legacy PLAD18KP75A variants with identical mechanical dimensions, pinout, and electrical specifications. It retains the same 12.32 × 10.54 mm footprint, metal-base cathode configuration, and RoHS-compliant matte-tin plating. No PCB layout changes or firmware updates are required when upgrading to the current MPLAD18KP75A revision.
MPLAD18KP75A 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 1396A (1.396kA)
- 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
MPLAD18KP75A FAQ
1.How can I place an order for MPLAD18KP75A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP75A 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 MPLAD18KP75A reliable?
The price and inventory of MPLAD18KP75A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP75A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP75A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP75A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP75A?
MPLAD18KP75A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP75A 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 MPLAD18KP75A?
For technical support, including MPLAD18KP75A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP75A requirements.
6.How does Aetrix verify that MPLAD18KP75A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP75A 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 MPLAD18KP75A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP75A?
All MPLAD18KP75A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP75A, 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 MPLAD18KP75A part is unused and in its original packaging.
Return procedure for MPLAD18KP75A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP75A Tags
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