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Microchip Technology MPLAD18KP9.0A
- Part No.:
- MPLAD18KP9.0A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP9.0A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
MPLAD18KP9.0A 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, features a 9.0 V reverse standoff voltage (VWM), clamps to ≤15.4 V at 1169 A peak current, and exhibits <100 ps response time. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for lightning protection.
For engineers reviewing the MPLAD18KP9.0A datasheet, MPLAD18KP9.0A pinout, MPLAD18KP9.0A application, or MPLAD18KP9.0A equivalent, key selection criteria include its 9.0 V VWM, 1169 A IPP, low RθJC of 0.7 °C/W, compliance with IEC 61000-4-5 (42 Ω, 12 Ω, 2 Ω source), and suitability for secondary lightning protection in avionics and 12 V/24 V vehicle systems.
Technical Context
The MPLAD18KP9.0A employs an avalanche diode structure optimized for fast transient suppression with sub-100 ps turn-on latency. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained energy dissipation under multi-stroke lightning events per RTCA DO-160 Section 22.
It operates as a unidirectional clamp between power rail and ground, with cathode on the metal base (bottom side). Standby leakage is limited to 60 μA at 9.0 V, and it maintains stable breakdown (10.0–11.1 V) across -55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous DC or peak AC voltage the device blocks without conduction |
| V(BR) min/max | 10.0–11.1 V - Breakdown initiates within this range at I(BR), ensuring reliable clamping onset |
| VC @ IPP | ≤15.4 V - Clamping voltage at 1169 A peak pulse, limiting downstream voltage stress |
| IPP | 1169 A - Peak surge current survivable at 10/1000 μs waveform, critical for load dump immunity |
| PPP | 18,000 W - Peak pulse power rating, enabling multi-stroke lightning compliance (RTCA DO-160) |
| RθJC | 0.7 °C/W - Low junction-to-case thermal resistance allows efficient heat transfer to PCB/heatsink |
| ID @ VWM | 60 μA - Low standby leakage preserves battery life in always-on 12 V systems |
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. Cathode is the exposed metal base (bottom side); anode is top-side metallization.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and high-current return node; must be soldered to large copper pour or heatsink |
| Top-Side Metallization | Anode | Connects to protected line (e.g., 12 V rail); minimal trace inductance required for fast response |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW Pulse Power Rating | Enables single-device protection against severe automotive load dump (ISO 7637-2 Pulse 5a/b) and DO-160 lightning strokes |
| 0.7 °C/W Thermal Resistance | Allows >70 W steady-state dissipation at TC = 100°C, supporting hybrid surge + bias operation |
| AEC-Q101 Qualified | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| RTCA DO-160F Level 4 Pin Injection | Meets aircraft wiring harness immunity requirements for Waveform 4 (6.4/69 μs) up to 9.0 V VWM |
| IEC 61000-4-5 Compliance (42 Ω, 12 Ω, 2 Ω) | Supports secondary lightning protection across Class 1–5 per 42 Ω source, and Class 1–4 per 12 Ω source |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC bus in aircraft flight control computers from induced lightning transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point, shunting surge current to chassis ground via metal base. Use Value: Withstands ≥500 multi-stroke lightning events at 18 kW without degradation, verified per DO-160 test sequence. | Use Scenario: Safeguarding 12 V supply input of diesel ECU against alternator load dump spikes (ISO 7637-2 Pulse 5b). IC Role / Device Role / Timing Role: Unidirectional TVS connected between battery rail and ground, triggered within <100 ps to limit voltage to ≤15.4 V. Use Value: Prevents microcontroller reset or CAN transceiver damage during 120 V/200 ms load dump events. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: Suppressing switching transients on 48 V DC bus feeding IGBT gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: Fast-response clamp absorbing inductive kickback from contactor coils and snubber circuits. Use Value: Limits voltage overshoot to <16 V, preventing gate oxide rupture in 65 V-rated MOSFETs. | Use Scenario: Secondary surge protection on 72 V nominal signaling power feed in EN 50121-4-compliant railway trackside cabinets. IC Role / Device Role / Timing Role: Back-up TVS staged after primary MOV, handling residual fast-rising transients from nearby lightning strikes. Use Value: Provides 1169 A IPP capacity at 72 V system level, meeting IEC 61000-4-5 Class 4 (2 Ω source) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | 600 W PPP rating, 100 A IPP, SMC package, RθJC = 1.5 °C/W | Only suitable for low-energy surges (e.g., ESD, EFT); insufficient for load dump or lightning | Select SMBJ9.0A only for cost-sensitive consumer electronics where surge threat is limited to IEC 61000-4-2/4-4. |
| SMCJ9.0A | 1500 W PPP rating, 139 A IPP, same SMC package, RθJC = 1.5 °C/W | Meets ISO 7637-2 Pulse 1/2 but not Pulse 5; lacks DO-160 qualification | Choose SMCJ9.0A for automotive body electronics with moderate surge exposure, but not for engine bay or avionics. |
Compared with SMBJ9.0A and SMCJ9.0A, the MPLAD18KP9.0A provides 12× and 12× higher peak pulse power respectively, enabling robust protection in mission-critical aerospace and heavy-duty automotive systems where multi-stroke survivability and ultra-low thermal resistance are mandatory.
Availability
MPLAD18KP9.0A is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and AEC-Q101/DO-160 qualified components.
Supply support for MPLAD18KP9.0A 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 MPLAD series was developed specifically for high-power, surface-mount transient suppression in safety-critical platforms where thermal performance, multi-stroke endurance, and aviation-standard compliance are non-negotiable.
FAQ
What is the maximum clamping voltage of the MPLAD18KP9.0A at its rated peak pulse current?
The MPLAD18KP9.0A has a maximum clamping voltage (VC) of 15.4 V when subjected to its rated peak pulse current of 1169 A under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and ensures downstream circuitry remains below safe operating voltage thresholds during surge events.
Is the MPLAD18KP9.0A suitable for bidirectional signal line protection?
No, the MPLAD18KP9.0A is a unidirectional TVS diode, intended for DC power rail protection where polarity is fixed. For bidirectional protection (e.g., AC lines or data buses), the bidirectional variant MPLAD18KP9.0CA must be used. Using the unidirectional MPLAD18KP9.0A on bidirectional signals risks forward conduction and failure.
Does the MPLAD18KP9.0A require a heatsink for standard operation?
The MPLAD18KP9.0A does not require an external heatsink for single-pulse surge events, but its metal base must be soldered to a minimum 10 cm² copper pad for effective thermal spreading. For repetitive surges or elevated ambient temperatures, a dedicated heatsink attached to the metal base is recommended to maintain junction temperature below 150°C, leveraging its 0.7 °C/W RθJC.
What standards does the MPLAD18KP9.0A meet for lightning protection?
The MPLAD18KP9.0A meets RTCA DO-160F Section 22 lightning-induced transient requirements (Level 4 pin injection for Waveform 4), and provides secondary lightning protection per IEC 61000-4-5 across multiple source impedances: Class 1–5 at 42 Ω, Class 1–4 at 12 Ω, and Class 2–3 at 2 Ω - all verified for the MPLAD18KP9.0A variant.
How is polarity identified on the MPLAD18KP9.0A package?
Polarity is defined by physical construction: the cathode is the exposed metal base (bottom side) of the MPLAD18KP9.0A, while the anode is the top-side metallized pad. The device marking "MPLAD18KP9.0A" appears on the top surface, and no additional polarity symbol is printed - correct orientation requires mounting the metal base onto the ground plane or heatsink.
MPLAD18KP9.0A 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 1169A (1.169kA)
- 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
MPLAD18KP9.0A FAQ
1.How can I place an order for MPLAD18KP9.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP9.0A 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 MPLAD18KP9.0A reliable?
The price and inventory of MPLAD18KP9.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP9.0A is usually 5 days.
3.What payment methods are accepted for MPLAD18KP9.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP9.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP9.0A?
MPLAD18KP9.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP9.0A 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 MPLAD18KP9.0A?
For technical support, including MPLAD18KP9.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP9.0A requirements.
6.How does Aetrix verify that MPLAD18KP9.0A is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP9.0A 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 MPLAD18KP9.0A meets industry standards.
7.What is the process for return or replacement of MPLAD18KP9.0A?
All MPLAD18KP9.0A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP9.0A, 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 MPLAD18KP9.0A part is unused and in its original packaging.
Return procedure for MPLAD18KP9.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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