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Microchip Technology MAPLAD18KP48AE3
- Part No.:
- MAPLAD18KP48AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP48AE3.pdf
- Description:
- TVS DIODE 48VWM 77.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,459
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Product details
Overview
MAPLAD18KP48AE3 from Microsemi is a surface-mount, unidirectional 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, 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 MAPLAD18KP48AE3 datasheet, MAPLAD18KP48AE3 pinout, MAPLAD18KP48AE3 application, or MAPLAD18KP48AE3 equivalent, key selection criteria include its 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant matte-tin plating, 12.32–12.57 mm package width, and compliance with IEC 61000-4-5 (Class 1–5, 42 Ω source) and ESD/EFT per IEC 61000-4-2/4-4.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuitry, activating above its 48 V standoff threshold to divert surge energy to ground. Its low RθJC (0.7 °C/W) enables effective thermal management when mounted on a heatsink, supporting multi-stroke lightning events per RTCA DO-160 Section 22.
The device uses silicon avalanche technology with controlled breakdown characteristics, exhibiting <100 ps response time and a temperature coefficient of breakdown voltage (αVBR) of +55 mV/°C. It is rated for junction temperatures from –55 °C to +150 °C and supports steady-state dissipation up to 2.5 W at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains full-rated lightning surge energy without failure |
| Reverse Standoff Voltage (VWM) | 48 V - maximum continuous DC or RMS operating voltage before conduction |
| Breakdown Voltage (VBR) | 53.3–58.9 V @ IBR - precise avalanche onset range ensures predictable clamping initiation |
| Max Clamping Voltage (VC @ IPP) | 77.4 V @ 233 A - limits downstream voltage stress during worst-case transients |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct thermal coupling to heatsink for repeated surge handling |
| Standby Current (ID @ VWM) | 10 μA max - negligible leakage at operating voltage, preserving system efficiency |
| Moisture Sensitivity Level | Level 1 (J-STD-020B) - no dry pack required, simplifies SMT assembly logistics |
Pinout & Package
MAPLAD18KP48AE3 uses a surface-mount, 2-terminal plastic package with metal base cathode (pin 1 = cathode, pin 2 = anode). The metal backside serves as the cathode terminal and primary thermal path; polarity is marked by cathode band on top surface per standard diode convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (metal base) | Surge return path / thermal interface | Low-inductance, high-current return node; directly bonded to PCB copper pour or heatsink for thermal and electrical performance |
| Anode (top-side lead) | Protected line connection | Connected to the line being protected (e.g., 48 V rail); forms clamping loop with cathode to shunt surge current |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Enables single-device protection against severe lightning-induced surges per DO-160 Section 22, eliminating need for stacked TVS arrays |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and chassis applications requiring extended temperature cycling and mechanical robustness |
| RoHS-compliant matte-tin plating (e3) | Ensures solderability and intermetallic formation control per MIL-STD-750 Method 2026, compatible with lead-free reflow profiles |
| RTCA DO-160F Waveform 4 Level 4 compliance | Guarantees survivability against 6.4/69 μs pin-injection transients at 25 °C, critical for avionics data bus and sensor interfaces |
| IEC 61000-4-5 Class 5 support (42 Ω source) | Meets highest secondary lightning immunity level for industrial and aerospace power input stages without external impedance tuning |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC distribution bus in commercial aircraft avionics bays exposed to lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping TVS placed at bus entry point to limit voltage excursion during multi-stroke events. Use Value: 18,000 W rating and 0.7 °C/W RθJC allow sustained operation across repeated 10/1000 μs surges without thermal runaway or parameter shift. | Use Scenario: 12 V/24 V alternator output line in heavy-duty trucks experiencing ISO 7637-2 load dump pulses up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS connected between battery rail and ground to clamp positive-going overvoltage spikes. Use Value: 48 V VWM provides margin above nominal 28 V system while clamping at 77.4 V ensures downstream 80 V-rated MOSFETs remain within safe operating area. |
| Industrial Motor Drive Inputs | Railway Signaling Interfaces |
Use Scenario: AC/DC front-end of variable-frequency drives subjected to switching transients and induced RFI from nearby contactors. IC Role / Device Role / Timing Role: Input-stage TVS suppressing fast-rising (<100 ps) transients before rectifier bridge and bulk capacitor. Use Value: Sub-100 ps response time and 233 A IPP capability prevent gate driver latch-up and IGBT short-circuit failures during EMC testing. | Use Scenario: 48 V signaling lines in European railway signaling cabinets requiring EN 50121-3-2 compliance for surge immunity. IC Role / Device Role / Timing Role: Bidirectional-capable variant used (MAPLAD18KP48CA), but unidirectional MAPLAD18KP48AE3 deployed where polarity is fixed and cost optimization is prioritized. Use Value: 77.4 V clamping voltage ensures compatibility with 100 V-rated optocouplers and isolated RS-485 transceivers in safety-critical communication links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A (onsemi) | 600 W PPP rating, 70 V clamping @ 53.3 A, SMC package (larger footprint, higher RθJA) | Targeted at consumer/industrial grade; lacks DO-160/IEC 61000-4-5 Class 5 validation and AEC-Q101 qualification | Select SMBJ48A only for cost-sensitive, non-safety-critical designs where 18 kW surge capacity is unnecessary |
| TPSMD18A48 (Texas Instruments) | 18 kW PPP, 77 V clamping @ 233 A, but 1.2 °C/W RθJC, no DO-160F Waveform 4 certification | Designed for telecom infrastructure; not screened to MIL-PRF-19500 or AEC-Q101, limited traceability | Choose TPSMD18A48 if thermal budget allows higher junction rise, and DO-160 compliance is not mandated |
Compared with SMBJ48A and TPSMD18A48, MAPLAD18KP48AE3 uniquely combines 18 kW surge capacity, 0.7 °C/W thermal resistance, AEC-Q101 qualification, and RTCA DO-160F Level 4 pin injection compliance-making it the only option qualified for high-reliability aerospace power entry and automotive load dump where multi-stroke endurance and traceability are mandatory.
Availability
MAPLAD18KP48AE3 is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive inputs requiring stable component supply, long-term lifecycle assurance, and full lot traceability.
Supply support for MAPLAD18KP48AE3 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 family-including MAPLAD18KP48AE3-is engineered for extreme transient suppression in mission-critical systems, emphasizing multi-stroke lightning resilience, thermal robustness, and qualification to RTCA DO-160, AEC-Q101, and IEC 61000-4-5 standards.
FAQ
What is the clamping voltage of MAPLAD18KP48AE3 at its rated peak pulse current?
The MAPLAD18KP48AE3 has a maximum clamping voltage (VC) of 77.4 V at its rated peak pulse current (IPP) of 233 A under 10/1000 μs waveform conditions. This value is guaranteed per the manufacturer's electrical characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MAPLAD18KP48AE3 maintains this clamping performance across its qualified temperature range and after multiple surge strikes when properly heatsinked.
Is MAPLAD18KP48AE3 suitable for bidirectional transient protection?
No, MAPLAD18KP48AE3 is a unidirectional TVS diode, optimized for clamping positive-going transients on DC rails. For bidirectional protection, the equivalent part number is MAPLAD18KP48CA (with 'CA' suffix). The 'E3' suffix on MAPLAD18KP48AE3 denotes RoHS-compliant matte-tin plating but does not affect polarity. Using MAPLAD18KP48AE3 on AC or bipolar signal lines would result in forward conduction during negative half-cycles and potential failure.
Does MAPLAD18KP48AE3 require a heatsink for reliable operation?
Yes-while MAPLAD18KP48AE3 can handle single 18 kW surges without external cooling, its 0.7 °C/W junction-to-case thermal resistance is designed for attachment to a heatsink or large copper plane to manage cumulative heating during multi-stroke events (e.g., RTCA DO-160 Section 22). Without thermal management, repeated surges cause junction temperature rise beyond 150 °C, risking parametric drift or catastrophic failure. The MAPLAD18KP48AE3 datasheet specifies case temperature control per test condition 4.
What certifications and standards does MAPLAD18KP48AE3 meet?
MAPLAD18KP48AE3 is qualified to AEC-Q101 for automotive reliability, compliant with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) up to Class 5 with 42 Ω source impedance. It also passes RTCA DO-160F Section 22 lightning testing and Waveform 4 Level 4 pin injection. All units undergo 100% surge testing and lot-level 3σ screening on standby current (ID). The MAPLAD18KP48AE3 is RoHS-compliant (e3) and moisture sensitivity Level 1.
How does the 'E3' suffix in MAPLAD18KP48AE3 affect its assembly process?
The 'E3' suffix indicates RoHS-compliant annealed matte-tin plating on the terminals of MAPLAD18KP48AE3, which is solderable per MIL-STD-750 Method 2026 and compatible with standard lead-free reflow profiles (peak 260 °C for 10 s). Unlike legacy tin-lead finishes, E3 plating eliminates intermetallic brittleness risks and ensures consistent wetting on OSP- or ENIG-finished PCBs. No special flux or preheat adjustments are needed for MAPLAD18KP48AE3 assembly beyond standard J-STD-020B Level 1 guidelines.
MAPLAD18KP48AE3 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):
- 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
MAPLAD18KP48AE3 FAQ
1.How can I place an order for MAPLAD18KP48AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP48AE3 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 MAPLAD18KP48AE3 reliable?
The price and inventory of MAPLAD18KP48AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP48AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP48AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP48AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP48AE3?
MAPLAD18KP48AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP48AE3 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 MAPLAD18KP48AE3?
For technical support, including MAPLAD18KP48AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP48AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP48AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP48AE3 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 MAPLAD18KP48AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP48AE3?
All MAPLAD18KP48AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP48AE3, 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 MAPLAD18KP48AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP48AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP48AE3 Tags
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