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Microchip Technology MAPLAD18KP64A
- Part No.:
- MAPLAD18KP64A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP64A.pdf
- Description:
- TVS DIODE 64VWM 103VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,960
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Product details
Overview
MAPLAD18KP64A 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 64 V reverse standoff voltage (VWM), clamps to ≤103 V at 175 A peak impulse current (IPP), and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation in lightning and load-dump protection circuits.
For engineers reviewing the MAPLAD18KP64A datasheet, MAPLAD18KP64A pinout, MAPLAD18KP64A application, or MAPLAD18KP64A equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), RTCA DO-160F Waveform 4 Level 4 compliance, and high-reliability AEC-Q101 qualified surge suppression in safety-critical avionics and vehicle ECUs.
Technical Context
The MAPLAD18KP64A employs an avalanche diode structure optimized for low clamping ratio and fast response (<100 ps rise time), enabling effective suppression of multi-stroke lightning transients defined in RTCA DO-160 Section 22. Its metal-base package provides direct thermal path to heatsink, supporting sustained operation under repetitive 0.05% duty-cycle surges.
It meets IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT (40 A), and IEC 61000-4-5 surge immunity up to Class 5 with 42 Ω source impedance - validated for unidirectional configurations across the full MPLAD18KP7.0A–200CA family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning strikes without failure |
| Reverse Standoff Voltage (VWM) | 64 V - matches nominal 48 V DC bus systems with margin for ripple and transients |
| Clamping Voltage (VC) | ≤103 V @ IPP = 175 A - limits downstream voltage stress to <1.6× VWM during surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct mounting to heatsink for thermal management in high-duty-cycle applications |
| Surge Current (IPP) | 175 A @ 10/1000 μs - exceeds IEC 61000-4-5 Class 4 requirement (40 A) by >4× |
| Breakdown Voltage (V(BR)) | 71.1–78.6 V @ I(BR) - ensures reliable avalanche conduction onset above operating voltage |
| Standby Leakage (ID) | ≤10 μA @ 64 V - negligible power loss in always-on protection circuits |
Pinout & Package
MAPLAD18KP64A uses a surface-mount plastic package with metal baseplate (cathode) and single anode terminal on top. The cathode is the metal base underside; polarity is marked on body. Package dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), weight ≈1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface pad) | Positive surge current entry point | Connected to protected line; conducts surge current into cathode during overvoltage |
| Cathode (metal baseplate) | Common reference and thermal path | Must be soldered to copper pour or heatsink; serves as both electrical return and primary heat sink interface |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package with metal base | Enables PCB-level surge protection without through-hole mounting or added height; supports automated assembly |
| AEC-Q101 qualified reliability | Validated for automotive ECU use with wafer lot traceability, 3σ ID screening, and surge testing per JEDEC standards |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection transients up to 100 V at 25 °C - required for commercial avionics |
| IEC 61000-4-5 Class 5 support (42 Ω) | Provides secondary lightning protection in telecom and industrial control cabinets with minimal external components |
| MIL-PRF-19500 upscreening options | Enables Hi-Rel derivative versions (M, MA, MX, MXL) for space-qualified or military platforms via optional screening |
Applications
| Aerospace Avionics Power Bus Protection | Automotive 48 V Mild Hybrid ECU Protection |
|---|---|
Use Scenario: Protecting ARINC 429 data lines and 28 V DC power inputs in flight control computers against DO-160 Section 22 lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground, clamping transients within 100 ps to prevent latch-up or damage to ASICs and FPGAs. Use Value: Enables compliance with DO-160F Waveform 4 Level 4 (6.4/69 μs) and Waveform 5A Level 4 (40/120 μs) without derating at 25 °C. |
Use Scenario: Safeguarding gate drivers and CAN transceivers in 48 V battery management systems exposed to ISO 7637-2 Load Dump pulses. IC Role / Device Role / Timing Role: Primary surge clamp on 48 V input rail, absorbing up to 18 kW energy while maintaining clamping voltage below 103 V. Use Value: Prevents overvoltage failure of SiC MOSFETs and isolated DC-DC controllers during 120 V/350 ms load dump events. |
| Industrial Motor Drive DC Link Protection | Telecom Base Station Power Input Protection |
Use Scenario: Secondary surge protection on DC link capacitors in variable-frequency drives subjected to IEC 61000-4-5 indirect lightning coupling. IC Role / Device Role / Timing Role: Parallel-mounted TVS across DC bus to limit transient overvoltage during switching faults or grid disturbances. Use Value: Delivers 175 A IPP at 10/1000 μs with 0.7 °C/W RθJC, allowing direct heatsink mounting for repeated surge handling without thermal runaway. |
Use Scenario: Front-end protection for -48 V telecom rectifier outputs exposed to AC mains surges and induced lightning currents. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, rated for Class 5 (42 Ω) and Class 4 (12 Ω) IEC 61000-4-5 waveforms. Use Value: Achieves <10 μA leakage at 64 V, minimizing standby power loss while sustaining 18 kW peak power for multi-stroke event recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ64A | Lower PPP (400 W), smaller SMC package, RθJA = 40 °C/W, no AEC-Q101 or DO-160 qualification | Suitable for consumer-grade 64 V DC supplies; not rated for aviation or automotive safety-critical use | Select when cost and size dominate; avoid where multi-stroke lightning or regulatory compliance is required |
| Vishay V275LA20AP | Varistor-based, bidirectional, 275 VAC RMS rating, 10 kA 8/20 μs capability, no specified RθJC or DO-160 data | Used in AC mains input stages; lacks precise clamping voltage and fast response needed for DC bus protection | Prefer for AC line filtering; unsuitable as direct replacement due to different V-I curve, polarity, and thermal path |
Compared with SMAJ64A and V275LA20AP, MAPLAD18KP64A uniquely combines 18 kW pulse power, AEC-Q101 and DO-160F certification, metal-base thermal design, and guaranteed unidirectional clamping - making it irreplaceable in certified avionics and high-reliability 48 V automotive systems.
Availability
MAPLAD18KP64A is available at Aetrix Electronics and suitable for aerospace avionics, automotive 48 V mild hybrid ECUs, and industrial motor drive DC link protection requiring stable component supply and long-term lifecycle assurance.
Supply support for MAPLAD18KP64A 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, RF, timing, and power solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP64A belongs to Microsemi's PLAD high-power TVS family, engineered specifically for multi-stroke lightning protection in safety-critical systems where thermal robustness, regulatory compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP64A at its rated peak pulse current?
The MAPLAD18KP64A has a maximum clamping voltage (VC) of 103 V at 175 A peak impulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream circuitry remains within safe voltage margins during surge events. The clamping ratio (VC/VWM) is 1.61, confirming tight voltage control relative to its 64 V standoff rating.
Is MAPLAD18KP64A compliant with automotive reliability standards?
Yes, MAPLAD18KP64A is AEC-Q101 qualified and undergoes wafer lot traceability, 3σ standby current screening, and surge testing per JEDEC standards. It is explicitly listed in RF01215 Rev B as tested in accordance with AEC-Q101 requirements - making it suitable for automotive electronic control units, especially in 48 V mild hybrid architectures subject to ISO 7637-2 load dump.
Does MAPLAD18KP64A meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP64A is certified for RTCA DO-160F Section 22 lightning-induced transient protection. It supports Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 at 25 °C, as confirmed in RF01215 Rev B. Its 18 kW PPP rating and low RθJC enable multi-stroke endurance required for aircraft power and data bus protection.
What is the thermal resistance specification for MAPLAD18KP64A, and how does it impact layout?
MAPLAD18KP64A has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W, measured with case temperature controlled on a heatsink. This requires the metal baseplate (cathode) to be soldered directly to a large copper pour or external heatsink. Layout must follow the recommended pad dimensions (12.32 × 10.54 mm) in RF01215 Rev B to maintain thermal performance and avoid derating.
Can MAPLAD18KP64A be used in bidirectional configurations?
No, MAPLAD18KP64A is unidirectional only. Bidirectional variants carry the "CA" suffix (e.g., MAPLAD18KP64CA). The "A" suffix denotes unidirectional construction, with cathode on the metal baseplate. Using MAPLAD18KP64A in AC or bipolar signal paths would result in forward conduction during negative half-cycles and potential failure.
MAPLAD18KP64A 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 175A
- 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
MAPLAD18KP64A FAQ
1.How can I place an order for MAPLAD18KP64A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP64A 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 MAPLAD18KP64A reliable?
The price and inventory of MAPLAD18KP64A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP64A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP64A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP64A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP64A?
MAPLAD18KP64A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP64A 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 MAPLAD18KP64A?
For technical support, including MAPLAD18KP64A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP64A requirements.
6.How does Aetrix verify that MAPLAD18KP64A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP64A 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 MAPLAD18KP64A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP64A?
All MAPLAD18KP64A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP64A, 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 MAPLAD18KP64A part is unused and in its original packaging.
Return procedure for MAPLAD18KP64A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP64A Tags
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