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Microchip Technology MAPLAD18KP75A
- Part No.:
- MAPLAD18KP75A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP75A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
MAPLAD18KP75A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 75 V reverse standoff voltage (VWM), clamps to ≤121 V at 149 A peak pulse current (IPP), 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 for pin injection protection.
For engineers reviewing the MAPLAD18KP75A datasheet, MAPLAD18KP75A pinout, MAPLAD18KP75A application, or MAPLAD18KP75A equivalent, this device is selected for lightning-hardened avionics power rails, automotive load-dump protection, and secondary IEC 61000-4-5 surge suppression where low-profile SMT mounting and multi-stroke reliability are critical.
Technical Context
The MAPLAD18KP75A employs an avalanche breakdown structure optimized for fast response (<100 ps) and stable clamping under repetitive transients. Its metal-base package enables direct thermal coupling to PCB copper or heatsinks, supporting sustained energy dissipation with RθJC = 0.7 °C/W.
It is rated for operation from −55 °C to +150 °C, complies with IEC 61000-4-2/4-4/4-5 and RTCA DO-160F sections 22 and 25, and undergoes 100% surge testing per MIL-STD-750 Method 2026. Standby leakage is limited to 10 μA at 75 V, ensuring minimal system loading during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation in aircraft lightning multi-stroke tests |
| Reverse Standoff Voltage (VWM) | 75 V - matches nominal 60–72 V DC bus voltages in commercial aviation and heavy-duty vehicle systems |
| Clamping Voltage (VC) | ≤121 V @ IPP = 149 A - limits downstream IC stress to safe levels during 42 Ω IEC 61000-4-5 Class 4 surges |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables >70 W steady-state power handling when mounted on 2-in² copper pour with thermal vias |
| Breakdown Voltage (V(BR)) | 83.3–92.1 V @ I(BR) - ensures reliable turn-on margin above VWM while avoiding false triggering |
| Standby Leakage Current (ID) | ≤10 μA @ 75 V - negligible quiescent load on battery-backed or low-power control circuits |
| Response Time | <100 ps - clamps before sensitive analog or digital circuitry experiences overvoltage damage |
Pinout & Package
MAPLAD18KP75A uses a proprietary high-thermal-conductivity surface-mount package with a metal baseplate (cathode) and single anode terminal. The case is void-free UL94V-0 epoxy; terminals feature annealed matte-tin plating compatible with leaded and RoHS-compliant reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side marked pad) | Transient current entry point | Connected to protected line (e.g., 28 V aircraft bus); must be routed with low-inductance trace |
| Cathode (metal baseplate) | Current return path & thermal interface | Must be soldered directly to large copper area or heatsink; serves as primary heat extraction path |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Validated for RTCA DO-160 Section 22 multi-stroke lightning simulation without parameter shift |
| Metal-base thermal architecture | RθJC = 0.7 °C/W enables >10× higher steady-state power handling vs. standard SMC packages |
| AEC-Q101 qualification | Qualified for automotive under-hood applications including alternator load dump (ISO 7637-2 Pulse 5a/b) |
| IEC 61000-4-5 compliance | Secondary lightning protection up to Class 5 with 42 Ω source impedance (VWM ≥ 7.0 V) |
| Moisture sensitivity Level 1 | No dry-pack or baking required prior to reflow - reduces manufacturing overhead and moisture-related defects |
Applications
| Avionics Power Distribution | Commercial Aircraft Lighting Control |
|---|---|
Use Scenario: Protection of 28 V DC distribution panels feeding flight-critical actuators and sensors. IC Role / Device Role / Timing Role: Primary transient clamp on main bus input, absorbing DO-160F Section 22 Waveform 1 (lightning indirect effects). Use Value: Prevents latch-up or burnout in upstream DC-DC controllers by limiting bus voltage to ≤121 V during 18 kW surges. |
Use Scenario: Surge suppression on LED driver inputs in cabin lighting modules exposed to ESD and switching noise. IC Role / Device Role / Timing Role: Secondary protection stage after upstream filters, clamping fast transients from relay coil flyback and static discharge. Use Value: Maintains <10 μA standby leakage to avoid unintended dimming or flicker in always-on lighting circuits. |
| Heavy-Duty Vehicle ECUs | Industrial Motor Drive Inputs |
Use Scenario: Load-dump protection on engine control units connected to 24 V battery systems with alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECU input filter, rated for ISO 7637-2 Pulse 5b (35 V/100 ms). Use Value: Clamps peak voltage to 121 V within 100 ps, preventing damage to microcontroller I/O and CAN transceivers. |
Use Scenario: Input-stage surge suppression on variable-frequency drives receiving power from long cable runs in factory automation. IC Role / Device Role / Timing Role: High-energy clamp on AC/DC rectifier output, mitigating reflected surges from motor cable termination mismatches. Use Value: Handles 149 A peak current without derating at 100 °C case temperature due to 0.7 °C/W thermal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | Lower PPP (600 W), larger RθJA (50 °C/W), no AEC-Q101 or DO-160 qualification | Suitable only for consumer-grade single-stroke surges; not rated for multi-stroke lightning or automotive load dump | Select SMBJ75A only for cost-sensitive non-safety applications with <1 kA surge exposure. |
| SMCJ75A | PPP = 1500 W, same VWM/VC specs, but RθJC = 2.5 °C/W and no DO-160F Waveform 4 validation | Limited to industrial IEC 61000-4-5 Class 3; cannot meet avionics pin-injection or multi-stroke requirements | Choose SMCJ75A for general-purpose surge suppression where certification evidence is not required. |
Compared with SMBJ75A and SMCJ75A, the MAPLAD18KP75A provides 30× higher peak power, 3.5× better thermal resistance, and formal qualification for RTCA DO-160F and AEC-Q101 - making it the sole option for certified aerospace and automotive safety-critical power rail protection.
Availability
MAPLAD18KP75A is available at Aetrix Electronics and suitable for avionics power distribution, commercial aircraft lighting control, and heavy-duty vehicle ECU designs requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP75A 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) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-tolerant components for aerospace, defense, and industrial markets.
The MAPLAD18KP75A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for certified lightning and load-dump protection in mission-critical systems where thermal performance and multi-stroke endurance are mandatory.
FAQ
What is the maximum clamping voltage of the MAPLAD18KP75A at its rated peak pulse current?
The MAPLAD18KP75A has a maximum clamping voltage (VC) of 121 V at its rated peak pulse current (IPP) of 149 A under 10/1000 μs waveform conditions. This value is guaranteed across the full operating temperature range and is critical for ensuring downstream components remain within their absolute maximum voltage ratings during surge events.
Is the MAPLAD18KP75A qualified for automotive applications?
Yes, the MAPLAD18KP75A is AEC-Q101 qualified and explicitly rated for automotive load-dump protection per ISO 7637-2 Pulse 5a/b. Its 75 V VWM aligns with 24 V system architectures, and its 18 kW PPP rating exceeds typical load-dump energy requirements by a wide margin, ensuring robust field reliability.
Does the MAPLAD18KP75A require special PCB layout considerations?
Yes - the cathode is the metal baseplate, which must be soldered to a large copper area (≥2 in²) with ≥6 thermal vias for effective heat dissipation. Anode traces should be short and wide to minimize inductance. The recommended pad layout is documented in RF01215 Rev B, page 7, and deviation risks thermal runaway under repeated surges.
Can the MAPLAD18KP75A be used for bidirectional surge protection?
No - the MAPLAD18KP75A is unidirectional. For bidirectional protection at 75 V standoff, the correct variant is MAPLAD18KP75CA. Using the unidirectional MAPLAD18KP75A on AC-coupled or bipolar signal lines will result in forward conduction and potential failure during negative transients.
What certifications does the MAPLAD18KP75A meet for aerospace use?
The MAPLAD18KP75A meets RTCA DO-160F Section 22 (lightning-induced transient susceptibility) for Waveform 1 and Waveform 4 Level 4, and supports secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance up to Class 5. These certifications are verified in Microsemi's test report RF01215 Rev B.
MAPLAD18KP75A 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
MAPLAD18KP75A FAQ
1.How can I place an order for MAPLAD18KP75A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP75A 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 MAPLAD18KP75A reliable?
The price and inventory of MAPLAD18KP75A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP75A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP75A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP75A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP75A?
MAPLAD18KP75A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP75A 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 MAPLAD18KP75A?
For technical support, including MAPLAD18KP75A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP75A requirements.
6.How does Aetrix verify that MAPLAD18KP75A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP75A 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 MAPLAD18KP75A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP75A?
All MAPLAD18KP75A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP75A, 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 MAPLAD18KP75A part is unused and in its original packaging.
Return procedure for MAPLAD18KP75A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP75A Tags
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