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Microchip Technology MPLAD18KP8.5A
- Part No.:
- MPLAD18KP8.5A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP8.5A.pdf
- Description:
- TVS DIODE 85VWM 137VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,491
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Product details
Overview
MPLAD18KP8.5A 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 8.5 V reverse standoff voltage (VWM), clamps to ≤14.4 V at 1250 A peak current, and exhibits 0.7 °C/W junction-to-case thermal resistance. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for waveform 4.
For engineers reviewing the MPLAD18KP8.5A datasheet, MPLAD18KP8.5A pinout, MPLAD18KP8.5A application, or MPLAD18KP8.5A equivalent, key selection criteria include its 8.5 V VWM rating, 1250 A IPP capability, low RθJC of 0.7 °C/W for thermal management in high-reliability PCB layouts, and compliance with IEC 61000-4-5 (Class 1–5, 42 Ω source) and RTCA DO-160F lightning standards.
Technical Context
The MPLAD18KP8.5A employs an avalanche diode structure optimized for fast response (<100 ps turn-on) and high-energy absorption in unidirectional configuration. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under multi-stroke transients per RTCA DO-160 Section 22.
It operates within -55°C to +150°C junction temperature range and maintains stable clamping performance across temperature due to a specified 7.0 mV/°C breakdown voltage temperature coefficient (αV(BR)). Standby leakage is limited to 150 μA at 8.5 V, ensuring minimal system loading during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous operating voltage before clamping begins; selected to exceed nominal 7–8 V rail voltages in automotive load-dump circuits. |
| V(BR) min/max | 9.44–10.4 V - Breakdown occurs within this range at test current; ensures reliable triggering above VWM with margin against tolerance drift. |
| VC @ IPP | ≤14.4 V @ 1250 A - Clamping voltage under full-rated surge; limits downstream component stress to safe levels during 10/1000 μs transients. |
| PPP | 18,000 W @ 10/1000 μs - Peak power handling capacity; enables single-device protection against severe lightning-induced surges per DO-160. |
| RθJC | 0.7 °C/W - Low thermal resistance from junction to case; allows efficient heat transfer to external heatsink or copper pour, critical for repeated surge duty. |
| ID @ VWM | 150 μA - Ultra-low standby leakage at rated standoff; preserves battery life and avoids false triggering in low-power sensing nodes. |
| αV(BR) | 7.0 mV/°C - Predictable positive temperature coefficient; simplifies thermal design by ensuring V(BR) increases with temperature, avoiding premature conduction. |
Pinout & Package
The MPLAD18KP8.5A uses a proprietary high-thermal-conductivity surface-mount package with a metal baseplate serving as the cathode terminal. The anode is accessed via two solderable terminals on the top surface. Package dimensions are 12.32 × 10.54 × 3.68 mm (L × W × H), with IPC/JEDEC-compliant pad layout for optimal thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1 & 2) | Surge current entry path | Two parallel top-side terminals reduce current density and parasitic inductance; supports >1250 A surge without bond-wire failure. |
| Cathode (Metal Base) | Surge current return path & thermal interface | Entire bottom surface serves as low-inductance, high-conductivity cathode and primary thermal path to PCB heatsink or chassis. |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device protection against Class 4/5 lightning surges per IEC 61000-4-5 (42 Ω source) without cascaded TVS stages. |
| 0.7 °C/W RθJC | Allows direct mounting to copper thermal pads or heatsinks, reducing junction temperature rise by >70% vs. standard SMD packages under repeated surges. |
| AEC-Q101 qualification | Validates robustness for automotive under-hood applications including 12 V load dump (ISO 7637-2 Pulse 5a) and extended temperature cycling. |
| RTCA DO-160F Level 4 pin injection | Guarantees survivability against 6.4/69 μs waveform transients on avionics signal/power lines without derating at 25°C. |
| RoHS-compliant e3 plating | Matte-tin terminations ensure reliable solder joint formation and long-term intermetallic stability in lead-free reflow processes. |
Applications
| Aerospace Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 28 V DC bus inputs in flight control actuators exposed to lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary surge shunt device placed at board edge to divert >10 kA surge currents away from downstream DC-DC converters and FPGAs. Use Value: 18,000 W PPP rating and <100 ps response ensure clamping before transient energy propagates into sensitive logic, meeting DO-160F Waveform 4 Level 4 requirements. | Use Scenario: Input protection for 12 V supply rails feeding microcontrollers and CAN transceivers in engine bay ECUs subject to ISO 7637-2 load dump pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of input filter capacitors to clamp 120 V/400 ms load dump events without thermal runaway. Use Value: 8.5 V VWM aligns with nominal 12 V system while allowing margin for ripple; 1250 A IPP exceeds ISO 7637-2 Pulse 5a peak current requirement. |
| Industrial Motor Drive DC Link | Railway Signaling Power Supply |
Use Scenario: Protection of 48 V DC link inputs in variable-frequency drives subjected to switching-induced transients and EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: High-power TVS connected between DC+ and chassis ground to absorb repetitive 1–5 kHz commutation spikes. Use Value: 0.7 °C/W RθJC enables stable operation at 0.05% duty cycle without heatsink derating; 150 μA ID prevents unnecessary power loss in always-on systems. | Use Scenario: Secondary surge protection for 72 V auxiliary power supplies in train signaling cabinets exposed to induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Standoff-rated TVS deployed after primary MOV-based protection to handle residual fast-rising transients per EN 50121-3-2. Use Value: 14.4 V VC clamping level ensures downstream DC-DC converters remain within absolute maximum ratings during 2 Ω source impedance surges (IEC 61000-4-5 Class 2). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | 600 W PPP rating, 5.0 V RθJC, SMB package, 100 A IPP | Only suitable for low-energy ESD/EFT; cannot meet DO-160 lightning or ISO 7637 load dump requirements. | Select only for cost-sensitive consumer electronics where surge energy is <100 J and repetition rate is low. |
| SMCJ8.5A | 1500 W PPP rating, 12.5 °C/W RθJA, SMC package, 171 A IPP | Lacks AEC-Q101 qualification and DO-160F validation; insufficient for aerospace or automotive safety-critical systems. | Acceptable for industrial PLC I/O modules with moderate surge exposure but not for certified avionics or automotive power rails. |
Compared with SMBJ8.5A and SMCJ8.5A, the MPLAD18KP8.5A provides 30× higher peak power, 18× lower thermal resistance, and formal qualification for aviation and automotive standards-making it the sole choice when multi-stroke lightning immunity or load dump survival is mandatory.
Availability
MPLAD18KP8.5A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU protection, and industrial motor drive DC link applications requiring stable component supply, long-lifecycle support, and traceable high-reliability sourcing.
Supply support for MPLAD18KP8.5A 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, mixed-signal, and radiation-hardened ICs for aerospace, defense, and industrial markets.
The MPLAD18KP8.5A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for mission-critical surge protection where multi-stroke lightning resilience, low thermal resistance, and AEC-Q101 qualification are non-negotiable.
FAQ
What is the maximum clamping voltage of the MPLAD18KP8.5A under rated surge conditions?
The MPLAD18KP8.5A has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 1250 A at the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during transient events. The MPLAD18KP8.5A achieves this performance through low-parasitic packaging and optimized silicon geometry.
Is the MPLAD18KP8.5A suitable for automotive under-hood applications?
Yes, the MPLAD18KP8.5A is AEC-Q101 qualified and rated for operation from -55°C to +150°C, making it suitable for under-hood automotive environments. Its 8.5 V VWM and 14.4 V clamping voltage align with 12 V system load dump requirements (ISO 7637-2 Pulse 5a), and its metal-base thermal design sustains repeated surges without degradation. The MPLAD18KP8.5A is explicitly validated for such use cases in Microsemi's application documentation.
Does the MPLAD18KP8.5A require a heatsink for continuous operation?
No external heatsink is required for single-event surge protection, but thermal management is essential for repetitive surges. With a junction-to-case thermal resistance of 0.7 °C/W, the MPLAD18KP8.5A relies on PCB copper area or chassis contact via its metal baseplate. For duty cycles above 0.05%, a minimum 25 cm² 2-oz copper pour is recommended. The MPLAD18KP8.5A datasheet provides derating curves for elevated ambient temperatures.
How does the MPLAD18KP8.5A compare to bidirectional variants like MPLAD18KP8.5CA?
The MPLAD18KP8.5A is unidirectional and intended for DC power line protection where polarity is fixed; the MPLAD18KP8.5CA is bidirectional and suited for AC or data-line applications. Key differences include forward clamping behavior (MPLAD18KP8.5A clamps in forward bias at 2.0 V @ 500 A, while MPLAD18KP8.5CA does not conduct forward), and different breakdown symmetry. The MPLAD18KP8.5A must be oriented correctly on PCB with cathode to ground or negative rail.
What standards does the MPLAD18KP8.5A comply with for lightning protection?
The MPLAD18KP8.5A is verified for secondary lightning protection per IEC 61000-4-5 with 42 Ω, 12 Ω, and 2 Ω source impedances (Classes 1–5 depending on impedance), and meets RTCA DO-160F Section 22 multi-stroke lightning requirements. It also passes ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) testing. These validations are documented in Microsemi's RF01215 datasheet for the MPLAD18KP8.5A.
MPLAD18KP8.5A 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 132A
- 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
MPLAD18KP8.5A FAQ
1.How can I place an order for MPLAD18KP8.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP8.5A 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 MPLAD18KP8.5A reliable?
The price and inventory of MPLAD18KP8.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP8.5A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP8.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP8.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP8.5A?
MPLAD18KP8.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP8.5A 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 MPLAD18KP8.5A?
For technical support, including MPLAD18KP8.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP8.5A requirements.
6.How does Aetrix verify that MPLAD18KP8.5A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP8.5A 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 MPLAD18KP8.5A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP8.5A?
All MPLAD18KP8.5A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP8.5A, 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 MPLAD18KP8.5A part is unused and in its original packaging.
Return procedure for MPLAD18KP8.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP8.5A Tags
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