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Microchip Technology MAPLAD18KP45CAE3
- Part No.:
- MAPLAD18KP45CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP45CAE3.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,319
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Product details
Overview
MAPLAD18KP45CAE3 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 ≤72.7 V under 248 A peak impulse current, and features a 45 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (50.0–55.3 V). It meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MAPLAD18KP45CAE3 datasheet, MAPLAD18KP45CAE3 pinout, MAPLAD18KP45CAE3 application, or MAPLAD18KP45CAE3 equivalent, key selection criteria include its bidirectional polarity, low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant e3 plating, 1 g mass, and compatibility with FR4 PCB mounting per recommended pad layout - critical for aircraft avionics, engine control units, and rail signaling interfaces.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating above its 45 V working standoff voltage to divert surge energy away from sensitive components. Its silicon avalanche structure enables sub-5 ns response time and <100 ps turn-on latency, validated per IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT (4 kV), and RTCA DO-160F pin injection waveforms.
The device uses a thermally optimized metal-base package where the cathode is the exposed metal bottom surface - enabling direct heatsinking to PCB copper planes. Its 0.7 °C/W junction-to-case thermal resistance supports sustained multi-stroke operation under 0.05% duty cycle, as required by RTCA DO-160 Section 22 multi-stroke lightning testing.
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 across ≥1000 strokes |
| Reverse Standoff Voltage (VWM) | 45 V - maximum continuous DC or RMS operating voltage before clamping initiates |
| Clamping Voltage (VC) | ≤72.7 V @ 248 A - limits downstream voltage stress to safe levels during transients |
| Breakdown Voltage (V(BR)) | 50.0–55.3 V @ I(BR) - ensures reliable triggering margin above VWM |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB heatsink, critical for repeated surges |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack or baking required prior to reflow |
| RoHS Compliance | e3 matte-tin plating - lead-free, solderable per MIL-STD-750 Method 2026 |
Pinout & Package
MAPLAD18KP45CAE3 uses a surface-mount plastic package with exposed metal base (cathode terminal), void-free UL94V-0 epoxy body, and tin-plated terminations. The device has two terminals: anode (top metallization) and cathode (bottom metal base), with polarity marked on body per Microsemi nomenclature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal (top-side metallization) | Connected to protected line; forms avalanche junction with cathode during overvoltage |
| Cathode | Negative reference / heatsink interface (exposed metal base) | Must be soldered to large copper pour for thermal management; serves as primary heat path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating lines against ± polarity surges without external polarity biasing |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection transients up to 25 °C ambient - certified for aircraft avionics |
| IEC 61000-4-5 Class 1–5 secondary lightning protection | Validated at 42 Ω, 12 Ω, and 2 Ω source impedances - covers telecom, rail, and vehicle subsystems |
| Low-profile SMT footprint | 0.470″ × 0.230″ × 0.100″ (11.94 × 5.85 × 2.44 mm) - fits space-constrained modules while enabling thermal conduction |
| 3σ lot norm screening on ID | Ensures standby leakage ≤10 μA at 45 V - guarantees low power loss in always-on systems |
Applications
| Avionics Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in flight control computers from lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge current before reaching DC-DC converters. Use Value: 18 kW PPP rating and 72.7 V clamping ensure downstream 36 V-rated regulators remain within safe operating area during multi-stroke events. | Use Scenario: Safeguarding CAN and sensor supply lines in diesel engine ECUs subjected to ISO 7637-2 load dump and alternator ripple. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing 12 V system surges up to 248 A peak, with cathode tied to chassis ground plane. Use Value: 0.7 °C/W RθJC enables rapid heat dissipation into PCB copper, preventing thermal runaway during repeated 100 ms load dumps. |
| Rail Signaling Interface | Industrial PLC I/O Module |
Use Scenario: Shielding 48 V DC trackside signaling circuits from induced surges due to nearby traction current switching. IC Role / Device Role / Timing Role: Bidirectional TVS installed on field-side I/O terminals to clamp both positive and negative transients from electromagnetic coupling. Use Value: 45 V VWM matches nominal 48 V rail with 10% margin; 72.7 V VC prevents latch-up in RS-485 transceivers rated to 75 V abs max. | Use Scenario: Securing analog input channels (0–10 V, 4–20 mA) in programmable logic controllers exposed to factory floor EFT and ESD. IC Role / Device Role / Timing Role: Low-leakage TVS (ID ≤10 μA) placed upstream of precision op-amp front-ends to avoid signal offset drift. Use Value: 10 μA max standby current ensures <0.1 mV error in 10 kΩ input impedance paths - preserving 16-bit ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA | 600 W PPP rating, same 45 V VWM and bidirectional polarity, but 10× lower surge capacity | Not qualified for RTCA DO-160F or IEC 61000-4-5 Class 4/5; limited to consumer-grade ESD/EFT | Select SMBJ45CA only for cost-sensitive non-safety-critical designs with <100 A surge exposure |
| SMCJ45CA | 1500 W PPP, identical VWM and polarity, but lacks DO-160F certification and has higher RθJA (15 °C/W vs. 0.7 °C/W) | Unsuitable for multi-stroke lightning; requires external heatsink for >100 A pulses | Choose SMCJ45CA when board-level thermal design cannot accommodate metal-base soldering |
Compared with SMBJ45CA and SMCJ45CA, MAPLAD18KP45CAE3 provides 30× and 12× higher peak pulse power respectively, direct PCB heatsinking via cathode base, and formal qualification for aviation and heavy-industrial surge standards - making it the sole option for certified multi-stroke lightning protection.
Availability
MAPLAD18KP45CAE3 is available at Aetrix Electronics and suitable for avionics power distribution, automotive engine control units, and rail signaling interfaces requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP45CAE3 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, radiation-tolerant, and high-power analog/mixed-signal solutions for aerospace, defense, and industrial markets.
The MPLAD family was engineered specifically for high-energy transient suppression in safety-critical platforms, with emphasis on RTCA DO-160 compliance, thermal robustness, and lot-traceable manufacturing for mission-critical deployment.
FAQ
What is the clamping voltage of MAPLAD18KP45CAE3 at its rated peak pulse current?
The MAPLAD18KP45CAE3 exhibits a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 248 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and process variation per Microsemi RF01215 Rev B specifications, ensuring downstream components see no more than 72.7 V during worst-case surge events. The clamping performance is integral to its use in 48 V rail protection and avionics interfaces.
Is MAPLAD18KP45CAE3 certified for RTCA DO-160F lightning testing?
Yes, MAPLAD18KP45CAE3 is explicitly certified for RTCA DO-160F Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 compliance at 25 °C. The device's 18 kW PPP rating, low RθJC, and bidirectional construction enable it to meet the stringent cumulative heating and voltage clamping requirements of aircraft electrical systems - a qualification confirmed in Microsemi's RF01215 documentation.
How is thermal management implemented for MAPLAD18KP45CAE3 on a PCB?
Thermal management for MAPLAD18KP45CAE3 relies on soldering its exposed metal cathode base directly to a large copper pour acting as a heatsink. With a junction-to-case thermal resistance of just 0.7 °C/W, this configuration enables efficient heat extraction during repetitive surges. The recommended pad layout (per RF01215) specifies minimum copper area and thermal vias to maintain junction temperature below 150 °C - essential for sustaining 18 kW pulse capability without derating.
Does MAPLAD18KP45CAE3 meet IEC 61000-4-5 secondary lightning protection standards?
Yes, MAPLAD18KP45CAE3 is validated for IEC 61000-4-5 secondary lightning protection across multiple source impedances: Class 1–5 at 42 Ω, Class 1–4 at 12 Ω, and Class 2–3 at 2 Ω. Its 72.7 V clamping voltage and 248 A IPP ensure protected circuits remain within safe operating limits during standardized 1.2/50 μs open-circuit voltage and 8/20 μs current waveforms - supporting deployment in telecom infrastructure, industrial drives, and transportation control systems.
What does the 'CA' and 'E3' suffix indicate in MAPLAD18KP45CAE3?
The 'CA' suffix in MAPLAD18KP45CAE3 denotes bidirectional polarity, meaning the device clamps symmetrically for both positive and negative transients. The 'E3' suffix confirms RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1 - eliminating the need for dry-pack moisture protection and enabling standard Pb-free reflow profiles. Both suffixes are defined in Microsemi's part nomenclature guide RF01215 and directly impact circuit design and manufacturing flow.
MAPLAD18KP45CAE3 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):
- 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
MAPLAD18KP45CAE3 FAQ
1.How can I place an order for MAPLAD18KP45CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP45CAE3 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 MAPLAD18KP45CAE3 reliable?
The price and inventory of MAPLAD18KP45CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP45CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP45CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP45CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP45CAE3?
MAPLAD18KP45CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP45CAE3 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 MAPLAD18KP45CAE3?
For technical support, including MAPLAD18KP45CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP45CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP45CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP45CAE3 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 MAPLAD18KP45CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP45CAE3?
All MAPLAD18KP45CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP45CAE3, 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 MAPLAD18KP45CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP45CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP45CAE3 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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D5V0P1B2LP-7B
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
-
D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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