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Microchip Technology MAPLAD18KP7.5A
- Part No.:
- MAPLAD18KP7.5A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP7.5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,454
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Product details
Overview
MAPLAD18KP7.5A 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 7.5 V reverse standoff voltage (VWM), clamps to ≤12.9 V at 1396 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 Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MAPLAD18KP7.5A datasheet, MAPLAD18KP7.5A pinout, MAPLAD18KP7.5A application, or MAPLAD18KP7.5A equivalent, key selection criteria include its 7.5 V VWM rating, 1396 A IPP capability, low RθJC of 0.7 °C/W for thermal management on FR4 PCBs, compliance with DO-160F pin injection and IEC 61000-4-5 lightning standards, and suitability for primary-level load dump and multi-stroke lightning protection in avionics and vehicle ECUs.
Technical Context
The MAPLAD18KP7.5A employs an avalanche breakdown mechanism optimized for fast response (<100 ps) and stable clamping under repetitive 10/1000 μs transients. Its metal-base package enables direct thermal coupling to heatsinks or copper planes, supporting sustained operation at TJ ≤150°C with derated PPP above 100°C case temperature.
It is specified for unidirectional polarity only (no CA suffix), with cathode on the metal base - requiring correct PCB pad layout per RF01215 Rev B. Standby current ID is ≤750 μA at VWM, and breakdown voltage V(BR) is guaranteed 8.33–9.21 V at I(BR), ensuring robust margin over 7.5 V system operating voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous DC or peak AC voltage the device blocks without conduction |
| V(BR) min/max | 8.33–9.21 V @ I(BR) - ensures ≥0.83 V design margin above VWM for reliable standoff |
| VC @ IPP | ≤12.9 V @ 1396 A - limits downstream component stress during 10/1000 μs surges |
| PPP | 18,000 W @ 10/1000 μs - supports multi-stroke lightning events per DO-160 Section 22 |
| RθJC | 0.7 °C/W - enables efficient heat transfer to external heatsink or thermal pad |
| ID @ VWM | ≤750 μA - minimizes leakage impact on low-power sensor or control circuits |
| TJ range | −55 to +150 °C - qualified for extended-temperature avionics and engine bay applications |
Pinout & Package
MAPLAD18KP7.5A uses a proprietary surface-mount PLAD package with metal base cathode termination. The package measures 12.32 × 10.54 × 5.08 mm (L × W × H), features void-free UL94V-0 epoxy body, and exposes the cathode on the bottom metal surface for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top metallization) | Transient current entry point | Connected to protected line (e.g., 12 V rail); current flows anode→cathode during clamping |
| Cathode (metal base) | Current return path & thermal interface | Must be soldered to large copper pour or heatsink; serves as both electrical return and primary thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device protection against severe load dump (ISO 7637-2 Pulse 5a) and DO-160F Waveform 4 Level 4 surges |
| 0.7 °C/W RθJC | Reduces thermal bottleneck vs. standard SMD TVS; allows >2× higher duty-cycle operation on FR4 with recommended pad layout |
| AEC-Q101 qualified | Validates reliability for automotive ECU front-end protection without additional qualification testing |
| DO-160F Waveform 4 Level 4 compliance | Meets aircraft pin-injection immunity requirement (6.4/69 μs, 25°C), critical for flight-critical avionics interfaces |
| IEC 61000-4-5 Class 1–5 support | Provides secondary lightning protection across all severity levels with 42 Ω source impedance, simplifying system-level certification |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in airborne power management units against lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary-level TVS clamp placed directly at connector entry, absorbing multi-stroke surges before they reach DC-DC converters and microcontrollers. Use Value: 18,000 W PPP and <100 ps response ensure clamping occurs before downstream silicon fails, maintaining DO-160 compliance without cascaded protection stages. | Use Scenario: Safeguarding 12 V supply rails in gasoline/diesel engine control modules exposed to ISO 7637-2 Pulse 5a load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at battery input, conducting surge current to chassis ground via low-inductance cathode pad. Use Value: 1396 A IPP and 12.9 V clamping limit MCU supply rail overshoot to safe levels, eliminating need for oversized input capacitors or secondary regulators. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: Suppressing switching transients on 48 V DC link inputs of variable-frequency drives subjected to IEC 61000-4-4 EFT bursts and inductive kickback. IC Role / Device Role / Timing Role: High-energy TVS placed between rectifier output and bulk capacitor, clamping voltage spikes generated by IGBT commutation. Use Value: 0.7 °C/W RθJC enables stable operation under repeated 10/1000 μs surges at 0.05% duty factor, extending service life versus conventional SMD TVS diodes. | Use Scenario: Hardening 72 V signaling lines in track-side electronic interlocking systems against induced surges from nearby traction currents and lightning. IC Role / Device Role / Timing Role: Bidirectional-capable variant family member (e.g., MAPLAD18KP7.5CA) used for AC-coupled data lines; MAPLAD18KP7.5A applied to DC bias rails. Use Value: 7.5 V VWM aligns with 5 V logic supply margins while delivering 18 kW surge capacity, enabling compact, single-device protection without voltage dividers or Zener stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.5A | 600 W PPP, 100 A IPP, DO-214AA package, RθJC ≈ 40 °C/W | Lower energy handling; suitable only for ESD/EFT, not load dump or lightning | Select SMBJ7.5A only for cost-sensitive consumer-grade designs with sub-1 kA surge requirements. |
| SMCJ7.5A | 1500 W PPP, 213 A IPP, DO-214AB package, RθJC ≈ 15 °C/W | Lacks DO-160F and AEC-Q101 qualification; limited to industrial non-automotive use | Choose SMCJ7.5A for general-purpose 12 V rail protection where full aerospace/automotive certification is not required. |
Compared with SMBJ7.5A and SMCJ7.5A, MAPLAD18KP7.5A provides 12× and 12× higher peak pulse power respectively, achieves 57× and 21× lower thermal resistance, and carries formal AEC-Q101 and DO-160F qualifications - making it the only option for certified high-reliability load dump and multi-stroke lightning protection.
Availability
MAPLAD18KP7.5A is available at Aetrix Electronics and suitable for avionics power distribution, automotive ECU protection, and industrial motor drive DC link applications requiring stable component supply, long-term lifecycle support, and certified surge performance.
Supply support for MAPLAD18KP7.5A 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 PLAD series was developed to address the need for surface-mount TVS devices capable of replacing through-hole 5KP/15KP modules in space-constrained, high-surge environments - particularly where thermal management and certification compliance are critical.
FAQ
What is the clamping voltage of MAPLAD18KP7.5A at its rated peak pulse current?
The MAPLAD18KP7.5A has a maximum clamping voltage (VC) of 12.9 V when subjected to its peak impulse current (IPP) of 1396 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream circuitry remains within safe operating voltage limits during severe transients. The MAPLAD18KP7.5A maintains this clamping performance across its full operating temperature range.
Is MAPLAD18KP7.5A qualified for automotive applications?
Yes, MAPLAD18KP7.5A is explicitly qualified to AEC-Q101 for stress testing including HTGB, HTRB, and temperature cycling. It is designed for automotive engine control units, battery management systems, and ADAS power supplies where load dump (ISO 7637-2 Pulse 5a) and EFT immunity are required. The MAPLAD18KP7.5A's 18,000 W rating and 1396 A IPP exceed typical automotive surge requirements by significant margin.
How should the cathode terminal of MAPLAD18KP7.5A be mounted on the PCB?
The cathode of MAPLAD18KP7.5A is the metal base underside and must be soldered to a large copper thermal pad per the recommended pad layout in RF01215 Rev B. This pad provides both electrical return and primary thermal conduction path. Failure to use the specified footprint compromises RθJC (0.7 °C/W) and risks thermal runaway under repetitive surges. The MAPLAD18KP7.5A datasheet specifies minimum pad dimensions of 12.32 × 10.54 mm for optimal performance.
Does MAPLAD18KP7.5A meet RTCA DO-160F lightning test requirements?
Yes, MAPLAD18KP7.5A is certified for RTCA DO-160F Section 22 lightning-induced transient susceptibility, specifically Waveform 4 (6.4/69 μs) Level 4 at 25°C. It also supports Waveform 5A (40/120 μs) Level 4 up to 36 V variants. The MAPLAD18KP7.5A's 18,000 W PPP and fast <100 ps response enable compliance without external filtering or staged protection, as confirmed in Microsemi Application Note AN-132.
What is the standoff voltage tolerance and temperature coefficient of MAPLAD18KP7.5A?
The MAPLAD18KP7.5A has a reverse standoff voltage (VWM) of 7.5 V with no tolerance band specified - it is a nominal rating. Its breakdown voltage V(BR) is guaranteed between 8.33 V and 9.21 V at I(BR), yielding a minimum 0.83 V design margin. The temperature coefficient αV(BR) is +5.0 mV/°C, meaning V(BR) increases linearly with junction temperature, preserving clamping margin across −55°C to +150°C operation. This behavior is fully characterized and documented for MAPLAD18KP7.5A in the RF01215 datasheet.
MAPLAD18KP7.5A 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):
- 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
MAPLAD18KP7.5A FAQ
1.How can I place an order for MAPLAD18KP7.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP7.5A 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 MAPLAD18KP7.5A reliable?
The price and inventory of MAPLAD18KP7.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP7.5A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP7.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP7.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP7.5A?
MAPLAD18KP7.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP7.5A 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 MAPLAD18KP7.5A?
For technical support, including MAPLAD18KP7.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP7.5A requirements.
6.How does Aetrix verify that MAPLAD18KP7.5A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP7.5A 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 MAPLAD18KP7.5A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP7.5A?
All MAPLAD18KP7.5A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP7.5A, 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 MAPLAD18KP7.5A part is unused and in its original packaging.
Return procedure for MAPLAD18KP7.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP7.5A Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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