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Microchip Technology MAPLAD18KP45AE3
- Part No.:
- MAPLAD18KP45AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP45AE3.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,342
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Product details
Overview
MAPLAD18KP45AE3 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 45 V reverse standoff voltage (VWM), clamps to ≤72.7 V at 248 A peak impulse current (IPP), and operates across –55°C to +150°C junction temperature.
For engineers reviewing the MAPLAD18KP45AE3 datasheet, MAPLAD18KP45AE3 pinout, MAPLAD18KP45AE3 application, or MAPLAD18KP45AE3 equivalent, key selection criteria include its DO-160F Waveform 4 Level 4 compliance, IEC 61000-4-5 Class 1–5 secondary lightning protection capability, low 0.7°C/W junction-to-case thermal resistance, and RoHS-compliant e3 matte-tin plating.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to clamp transient overvoltages before they damage downstream circuitry. Its metal-base package provides direct thermal path to PCB copper or heatsink, enabling sustained multi-stroke surge handling per RTCA DO-160 Section 22. The device is characterized with 5 mA breakdown test current (I(BR)) and exhibits a +51 mV/°C temperature coefficient of V(BR).
It supports both unidirectional operation (cathode on metal base) and bidirectional variants (CA suffix), with clamping response time under 100 ps for unidirectional models. Standby leakage is limited to 10 μA at VWM, and forward clamping voltage is specified at 2.0 V under 500 A surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous DC or peak AC operating voltage the device blocks without conduction |
| V(BR) min/max | 50.0–55.3 V @ 5 mA - Ensures reliable turn-on above system nominal voltage with margin |
| VC @ IPP | 72.7 V @ 248 A - Clamping voltage during worst-case 10/1000 μs surge; defines maximum stress on protected IC |
| PPP | 18,000 W @ 10/1000 μs - Sustains high-energy lightning-induced transients without failure |
| RθJC | 0.7 °C/W - Enables efficient heat transfer from junction to case, critical for repeated surge duty cycles |
| ID @ VWM | 10 μA - Ultra-low leakage preserves battery life and avoids false triggering in low-power circuits |
| αV(BR) | +51 mV/°C - Predictable positive drift allows accurate derating over temperature range |
Pinout & Package
The MAPLAD18KP45AE3 uses a surface-mount PLAD package with metal base acting as cathode terminal. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Void-free UL94V-0 epoxy body with annealed matte-tin (e3) plating ensures solderability and RoHS compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary current return path and thermal interface; must be soldered to large copper pour or heatsink |
| Top Surface Pad | Anode | Signal-side connection; routed to protected line (e.g., 45 V rail or CAN bus line) |
Key Features
| Feature | Design Value |
|---|---|
| DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges up to 45 V system level without degradation |
| IEC 61000-4-5 Class 1–5 support (42 Ω source) | Validated for secondary lightning protection in avionics and vehicle ECUs with 42 Ω impedance matching |
| Low-profile thermally optimized package | 0.7 °C/W RθJC enables >1000 surge cycles at 0.05% duty factor when mounted per recommended pad layout |
| 3σ lot norm screening on ID | Ensures consistent standby leakage <10 μA across production lots for mission-critical reliability |
| MIL-PRF-19500 upscreening option | Available with high-reliability screening (M/MA/MXL levels) for aerospace and defense programs |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC distribution bus in commercial aircraft avionics bays subjected to DO-160 Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary transient suppression element placed at bus entry point to protect downstream DC-DC converters and FPGAs. Use Value: Delivers 18 kW clamping capacity with sub-100 ps response, meeting Level 4 Waveform 4 requirements while minimizing board space vs. through-hole alternatives. | Use Scenario: 12 V/24 V alternator output line in heavy-duty truck ECUs exposed to ISO 7637-2 Load Dump pulses. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy directly to chassis ground via metal base, preventing MOSFET gate oxide failure. Use Value: Withstands 120 V/350 ms load dump events with <10 μA leakage, eliminating need for series resistors or active clamps. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: 48 V DC link in variable-frequency drives where IGBT switching induces repetitive 1–2 kV transients. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing commutation spikes before they reach gate drivers and current sensors. Use Value: 0.7 °C/W thermal resistance allows mounting on shared heatsink with power stage, enabling >10⁴ surge cycles at 1 Hz repetition rate. | Use Scenario: 45 V signaling line in ERTMS/ETCS Level 2 balise transmission interfaces subject to EN 50121-4 conducted surges. IC Role / Device Role / Timing Role: Bidirectional protection (via CA variant) on differential pair, referenced to signal ground with controlled clamping symmetry. Use Value: 72.7 V clamping ensures receiver ICs (e.g., RS-485 transceivers) remain within absolute max ratings during 4 kV/2 Ω IEC 61000-4-5 tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A | 600 W PPP rating, SMB package, RθJA = 40°C/W, no DO-160 qualification | Limited to consumer/industrial grade; unsuitable for aviation or high-reliability multi-stroke environments | Select only for cost-sensitive, non-certified applications with <100 A surge exposure |
| SMCJ45A | 1500 W PPP, SMC package, RθJC = 1.5°C/W, AEC-Q101 qualified but not DO-160 tested | Meets automotive EMC standards but lacks RTCA/DO-160F waveform validation and 18 kW energy handling | Acceptable for ISO 16750-2 load dump if peak current <100 A; verify thermal design for repeated events |
Compared with SMBJ45A and SMCJ45A, MAPLAD18KP45AE3 provides 30× higher peak pulse power, certified DO-160F compliance, and superior thermal performance-making it the sole choice for aerospace-grade lightning protection where single-event energy exceeds 100 J and multi-stroke endurance is mandatory.
Availability
MAPLAD18KP45AE3 is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.
Supply support for MAPLAD18KP45AE3 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The PLAD family-including MAPLAD18KP45AE3-is engineered for extreme-surge environments, emphasizing thermal robustness, DO-160 certification, and multi-stroke survivability in safety-critical systems.
FAQ
What is the clamping voltage of MAPLAD18KP45AE3 at its rated peak pulse current?
The MAPLAD18KP45AE3 has a maximum clamping voltage (VC) of 72.7 V at 248 A peak impulse current (IPP) under 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is measured with the device mounted per recommended pad layout on FR4 board.
Does MAPLAD18KP45AE3 meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP45AE3 is validated for RTCA DO-160F Section 22 lightning-induced transient testing, specifically Waveform 4 (6.4/69 μs) at Level 4. Its 18 kW pulse power rating and low thermal resistance enable compliance with multi-stroke requirements essential for aircraft power systems.
How is polarity configured on MAPLAD18KP45AE3, and how should it be mounted?
MAPLAD18KP45AE3 is unidirectional, with the metal base serving as the cathode terminal. It must be mounted so the base contacts a large copper pour or heatsink connected to system ground or return path. The top surface pad is the anode and connects to the line being protected.
What is the thermal resistance specification for MAPLAD18KP45AE3, and why does it matter?
MAPLAD18KP45AE3 has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. This low value enables rapid heat dissipation during repeated surge events, allowing the device to sustain >1000 strokes at 0.05% duty factor without thermal runaway-critical for avionics and railway applications.
Is MAPLAD18KP45AE3 RoHS compliant, and what does the 'E3' suffix indicate?
Yes, MAPLAD18KP45AE3 is RoHS compliant. The 'E3' suffix denotes annealed matte-tin plating per JEDEC standards, ensuring lead-free solderability and compatibility with standard reflow profiles while maintaining corrosion resistance and intermetallic control.
MAPLAD18KP45AE3 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 248A
- 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
MAPLAD18KP45AE3 FAQ
1.How can I place an order for MAPLAD18KP45AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP45AE3 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 MAPLAD18KP45AE3 reliable?
The price and inventory of MAPLAD18KP45AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP45AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP45AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP45AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP45AE3?
MAPLAD18KP45AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP45AE3 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 MAPLAD18KP45AE3?
For technical support, including MAPLAD18KP45AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP45AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP45AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP45AE3 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 MAPLAD18KP45AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP45AE3?
All MAPLAD18KP45AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP45AE3, 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 MAPLAD18KP45AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP45AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP45AE3 Tags
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