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Microchip Technology MAPLAD18KP48CAE3
- Part No.:
- MAPLAD18KP48CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP48CAE3.pdf
- Description:
- TVS DIODE 48VWM 77.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,029
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Product details
Overview
MAPLAD18KP48CAE3 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤77.4 V under 233 A peak impulse current, and features a 48 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (53.3–58.9 V). It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.
For engineers reviewing the MAPLAD18KP48CAE3 datasheet, MAPLAD18KP48CAE3 pinout, MAPLAD18KP48CAE3 application, or MAPLAD18KP48CAE3 equivalent, key selection criteria include its bidirectional polarity, 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, IEC 61000-4-5 Class 4 secondary lightning protection (42 Ω source), and compatibility with FR4 PCBs using the specified pad layout.
Technical Context
The MAPLAD18KP48CAE3 employs an avalanche diode structure optimized for multi-stroke lightning transients per RTCA DO-160 Section 22. Its low RθJC (0.7 °C/W) enables effective heat dissipation when mounted on a heatsink, supporting repetitive surge duty cycles ≤0.05%. The device operates across –55 °C to +150 °C junction temperature range and maintains stable clamping performance under IEC 61000-4-2 ESD (±30 kV air) and IEC 61000-4-4 EFT (40 A).
It is engineered for secondary protection in DC power rails and signal lines where fast response (<5 ns turn-on), low clamping ratio (VC/V(BR) ≈ 1.45), and high reliability with wafer-level traceability are required. The metal-base cathode configuration ensures low-inductance mounting and supports high-current surge conduction without bond-wire limitations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage | 48 V - sets maximum continuous operating voltage before clamping initiates |
| Clamping Voltage | ≤77.4 V @ 233 A - limits downstream voltage stress during worst-case transients |
| Breakdown Voltage | 53.3–58.9 V @ I(BR) - defines precise avalanche onset threshold for predictable triggering |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct thermal coupling to heatsink for high-repetition-rate operation |
| Surge Current Rating | 233 A @ 10/1000 μs - validates robustness against automotive load dump and induced RFI |
| Polarity | Bidirectional (CA suffix) - protects AC-coupled or floating lines from both polarity transients |
Pinout & Package
MAPLAD18KP48CAE3 uses a surface-mount plastic package with metal base cathode termination. The device has two terminals: anode and cathode, with the cathode electrically connected to the exposed metal base (bottom side of package), enabling low-inductance, high-current path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts positive or negative surge current; connects to protected line or signal trace |
| Cathode (Metal Base) | Common return path / thermal interface | Electrically tied to PCB copper pour or heatsink; provides primary thermal conduction path and low-impedance ground reference |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device protection against RTCA DO-160 Section 22 multi-stroke lightning events without derating |
| Bidirectional construction | Protects AC-coupled interfaces (e.g., RS-485, CAN, Ethernet PHY) from polarity-agnostic transients |
| 0.7 °C/W RθJC | Allows >70% of surge energy to be conducted directly into heatsink, reducing PCB trace heating |
| AEC-Q101 qualified | Validates reliability for automotive under-hood and powertrain applications including 12 V/24 V battery systems |
| e3 RoHS-compliant plating | Ensures lead-free solder compatibility and long-term intermetallic stability in high-temperature environments |
Applications
| Aerospace Avionics Power Input | Automotive Battery Management System |
|---|---|
Use Scenario: Protection of 28 V DC power inputs in flight control computers subjected to DO-160F Waveform 4 (6.4/69 μs) lightning-induced surges. IC Role / Device Role / Timing Role: Primary secondary TVS clamp placed upstream of DC-DC converters and LDOs. Use Value: Limits input rail excursion to ≤77.4 V during 233 A transients, preventing converter latch-up and ensuring continued operation per DO-160 Level 4. | Use Scenario: Surge suppression on high-side current sense lines in 12 V BMS modules exposed to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Bidirectional clamp protecting precision shunt amplifier inputs from ±100 V transients. Use Value: Maintains signal integrity by clamping within 5 ns while surviving 18 kW pulses-no additional series impedance or filtering needed. |
| Industrial Motor Drive Control Board | Railway Signaling Interface |
Use Scenario: Protection of isolated encoder feedback lines in servo drives operating in EMI-heavy factory environments. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential quadrature signals (A/B/Z) referenced to chassis ground. Use Value: Bidirectional clamping prevents false edge detection during EFT bursts (IEC 61000-4-4), preserving position accuracy without adding propagation delay. | Use Scenario: Secondary protection on 72 V DC trackside signaling lines subject to indirect lightning coupling (IEC 61000-4-5, 42 Ω source). IC Role / Device Role / Timing Role: Class 4-compliant TVS installed at field cable entry point before isolation barrier. Use Value: Withstands 4 kV common-mode surges while maintaining <10 μA standby leakage at 48 V nominal rail-no false tripping of supervision circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA | 600 W PPP rating, 3.5 mm × 4.6 mm SMB package, RθJC = 25 °C/W | Not suitable for DO-160F Level 4 or multi-stroke lightning; limited to consumer/industrial single-event surges | Select when cost sensitivity outweighs aerospace/automotive qualification requirements and surge energy is <100 J |
| SMCJ48CA | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJC = 12 °C/W | Lacks AEC-Q101 qualification and RTCA DO-160F validation; insufficient for certified avionics | Use only in non-certified industrial controls where 18 kW capability is unnecessary and board space allows larger footprint |
Compared with SMBJ48CA and SMCJ48CA, the MAPLAD18KP48CAE3 delivers 30× higher peak power handling, 18× lower thermal resistance, and formal qualification for aviation and automotive safety-critical systems-enabling single-device compliance without parallel stacking or external heatsinking.
Availability
MAPLAD18KP48CAE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive battery management, and industrial motor drive applications requiring stable component supply, long-lifecycle support, and certified surge protection performance.
Supply support for MAPLAD18KP48CAE3 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 MAPLAD18KP48CAE3 belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where multi-stroke survivability and thermal robustness are mandatory.
FAQ
What is the clamping voltage specification for MAPLAD18KP48CAE3 under standard test conditions?
The MAPLAD18KP48CAE3 has a maximum clamping voltage (VC) of 77.4 V at 233 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured at TJ = 25°C and reflects the upper limit of voltage seen by downstream circuitry during worst-case surge events, ensuring reliable protection of 48 V-rated components.
Does MAPLAD18KP48CAE3 meet AEC-Q101 qualification requirements?
Yes, MAPLAD18KP48CAE3 is fully qualified to AEC-Q101 Rev D for stress testing including HTGB, HTRB, TST, and surge. This qualification confirms its suitability for automotive under-hood applications such as battery disconnect units and DC-DC converters where sustained operation at 150°C junction temperature and repeated surge exposure are required.
How does the metal base cathode configuration affect PCB layout for MAPLAD18KP48CAE3?
The MAPLAD18KP48CAE3 cathode is the exposed metal base on the bottom of the package, requiring direct connection to a large copper pour or heatsink. PCB layout must use the recommended pad dimensions (12.32–12.57 mm × 10.54–10.80 mm) with thermal vias to internal ground planes-failure to do so increases RθJA and risks thermal runaway during repetitive surges.
Can MAPLAD18KP48CAE3 be used for IEC 61000-4-5 Class 4 testing with 42 Ω source impedance?
Yes, MAPLAD18KP48CAE3 is explicitly rated for IEC 61000-4-5 Class 4 secondary lightning protection with 42 Ω source impedance, as confirmed in Microsemi RF01215 Rev B. It withstands 4 kV common-mode surges without degradation, making it appropriate for telecom infrastructure, railway signaling, and industrial PLC I/O modules requiring EN 61000-4-5 compliance.
What is the moisture sensitivity level (MSL) and reflow profile for MAPLAD18KP48CAE3?
MAPLAD18KP48CAE3 has IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack or baking is required prior to reflow. Its maximum solder temperature is 260°C for 10 seconds, compatible with standard lead-free reflow profiles. The e3 matte-tin plating ensures reliable wetting and intermetallic formation without voiding or dewetting risks.
MAPLAD18KP48CAE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 233A
- 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
MAPLAD18KP48CAE3 FAQ
1.How can I place an order for MAPLAD18KP48CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP48CAE3 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 MAPLAD18KP48CAE3 reliable?
The price and inventory of MAPLAD18KP48CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP48CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP48CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP48CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP48CAE3?
MAPLAD18KP48CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP48CAE3 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 MAPLAD18KP48CAE3?
For technical support, including MAPLAD18KP48CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP48CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP48CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP48CAE3 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 MAPLAD18KP48CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP48CAE3?
All MAPLAD18KP48CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP48CAE3, 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 MAPLAD18KP48CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP48CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP48CAE3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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