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Microchip Technology MAPLAD18KP24AE3
- Part No.:
- MAPLAD18KP24AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP24AE3.pdf
- Description:
- TVS DIODE 24VWM 38.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
MAPLAD18KP24AE3 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 24 V reverse standoff voltage (VWM), clamps to ≤38.9 V at 463 A peak impulse current (IPP), and exhibits 0.7 °C/W junction-to-case thermal resistance - enabling robust secondary lightning protection per IEC 61000-4-5 and RTCA DO-160F Waveform 4 Level 4.
For engineers reviewing the MAPLAD18KP24AE3 datasheet, MAPLAD18KP24AE3 pinout, MAPLAD18KP24AE3 application, or MAPLAD18KP24AE3 equivalent, key selection criteria include its 24 V VWM matching 24 V DC bus systems, RoHS-compliant e3 matte-tin plating, 1 g mass for mechanical stability, and validated performance under multi-stroke lightning stress (RTCA DO-160 Section 22) and ESD/EFT per IEC 61000-4-2/4-4.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating when transient voltage exceeds its 24 V working standoff level. Its silicon avalanche structure provides sub-100 ps response time and low clamping ratio (VC/VWM ≈ 1.62), critical for safeguarding sensitive gate drivers and power converters against load dump and induced RFI.
Thermally optimized for surface-mount PCB mounting on FR4 with recommended pad layout, it achieves 0.7 °C/W RθJC and 50 °C/W RθJA - enabling high-reliability operation up to +150 °C junction temperature while dissipating 18 kW surges without thermal runaway under ≤0.05% duty factor conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning transients without failure |
| Reverse Standoff Voltage (VWM) | 24 V - matches nominal 24 V DC power rails in avionics and commercial vehicle ECUs |
| Clamping Voltage (VC) | ≤38.9 V @ IPP = 463 A - limits downstream voltage stress to safe levels for 40 V-rated MOSFETs |
| Peak Impulse Current (IPP) | 463 A @ 10/1000 μs - validates compliance with IEC 61000-4-5 Class 3 (42 Ω source) |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct thermal coupling to heatsink or copper pour for sustained surge handling |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - eliminates dry-pack requirement and simplifies SMT assembly |
| RoHS Compliance | e3 matte-tin plating - meets lead-free soldering standards without compromising solderability |
Pinout & Package
MAPLAD18KP24AE3 uses a surface-mount plastic package with metal base cathode termination. The device has two terminals: anode (top surface marking side) and cathode (exposed metal base). Polarity is unidirectional; cathode must be connected to the highest potential node in the protected circuit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-potential terminal | Connected to ground or return path; defines conduction direction during reverse-biased surge events |
| Cathode | High-potential terminal | Exposed metal base - serves as primary thermal interface and must be soldered to large copper area for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating | Validated for multi-stroke lightning per RTCA DO-160F Section 22 - supports aircraft system certification |
| 0.7 °C/W RθJC | Enables >10× higher thermal power transfer vs. standard SMD TVS - reduces risk of thermal runaway during repetitive surges |
| Level 1 moisture sensitivity | Eliminates baking and dry-pack logistics - lowers manufacturing cost and avoids moisture-induced popcorning |
| AEC-Q101 qualified | Meets automotive-grade reliability requirements including HTOL, TC, and surge testing - suitable for under-hood ECUs |
| IEC 61000-4-5 compliance | Rated for Class 1–4 secondary lightning protection with 42 Ω, 12 Ω, and 2 Ω source impedances - covers diverse system architectures |
Applications
| Aerospace Avionics Power Bus Protection | Commercial Vehicle Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 24 V DC power distribution networks in flight control computers and navigation systems against lightning-induced transients per RTCA DO-160F Waveform 4 Level 4. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across input bus to divert surge energy to chassis ground before reaching DC/DC converters and microcontrollers. Use Value: Clamps to ≤38.9 V within <100 ps, preserving 40 V-rated power semiconductors and meeting FAA airworthiness requirements for multi-stroke resilience. |
Use Scenario: Safeguarding engine management ECUs from alternator load dump spikes (up to 120 V) and ISO 7637-2 pulses during battery disconnection events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 24 V supply rail, coordinated with upstream fuses and downstream L-C filters. Use Value: Withstands 18 kW surges at 10/1000 μs and maintains VWM = 24 V - ensuring compatibility with 24 V nominal architecture while surviving 100+ load dump cycles. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Power Interface |
Use Scenario: Shielding IGBT gate driver supplies and auxiliary power rails in variable-frequency drives from switching transients and induced RFI in factory environments. IC Role / Device Role / Timing Role: Fast-response TVS mounted directly at DC link capacitor terminals to suppress dV/dt-induced overshoot during IGBT turn-off. Use Value: Sub-100 ps response and 0.7 °C/W thermal resistance prevent cumulative heating during frequent motor starts/stops - extending system uptime. |
Use Scenario: Securing 24 V signaling interfaces in track-side electronic interlocking units against lightning coupling via long cable runs in outdoor rail infrastructure. IC Role / Device Role / Timing Role: Secondary protection device downstream of gas discharge tubes (GDTs), clamping residual surges after primary diversion. Use Value: Validated for IEC 61000-4-5 Class 3 (42 Ω) and Class 4 (12 Ω) - ensures interoperability with legacy GDT-based protection schemes in EN 50121-4 compliant systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower PPP (600 W), higher RθJA (65 °C/W), same VWM (24 V), SMC package | Limited to single-stroke surges; unsuitable for RTCA DO-160 multi-stroke validation | Select SMBJ24A only for cost-sensitive consumer-grade 24 V systems with infrequent transients |
| SMCJ24A | PPP = 1500 W, RθJC = 1.5 °C/W, same VWM (24 V), larger SMC package | Cannot meet 18 kW lightning requirements; lacks AEC-Q101 qualification | Choose SMCJ24A for industrial controls where full DO-160 compliance is not mandated |
Compared with SMBJ24A and SMCJ24A, MAPLAD18KP24AE3 delivers 30× higher peak pulse power and 2.1× lower thermal resistance - making it the only option qualified for certified aerospace lightning protection and high-cycle automotive load dump survival.
Availability
MAPLAD18KP24AE3 is available at Aetrix Electronics and suitable for aerospace avionics, commercial vehicle ECUs, and industrial motor drive designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAPLAD18KP24AE3 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, mixed-signal, and power management solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP24AE3 belongs to Microsemi's PLAD high-power TVS family, engineered specifically for mission-critical surge protection in environments demanding RTCA DO-160, AEC-Q101, and IEC 61000-4-5 compliance.
FAQ
What is the clamping voltage of MAPLAD18KP24AE3 at its rated peak impulse current?
The MAPLAD18KP24AE3 has a maximum clamping voltage (VC) of 38.9 V at its rated peak impulse current of 463 A under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures downstream components see no more than 38.9 V during worst-case surge events - critical for protecting 40 V-rated power devices in 24 V systems.
Is MAPLAD18KP24AE3 qualified for automotive applications?
Yes, MAPLAD18KP24AE3 is AEC-Q101 qualified and tested for automotive-grade reliability, including high-temperature operating life (HTOL), temperature cycling (TC), and surge endurance. Its 24 V VWM and 18 kW surge rating make it suitable for engine control units, body control modules, and ADAS power supplies exposed to load dump and jump-start transients.
How does the thermal design of MAPLAD18KP24AE3 differ from standard SMD TVS diodes?
MAPLAD18KP24AE3 features a dedicated metal base cathode with 0.7 °C/W junction-to-case thermal resistance - over 2× lower than typical SMC/SMB packages. This allows direct thermal coupling to PCB copper pours or external heatsinks, preventing thermal accumulation during repetitive surges and enabling sustained operation in high-duty-cycle environments like motor drives.
Does MAPLAD18KP24AE3 meet RTCA DO-160 lightning protection requirements?
Yes, MAPLAD18KP24AE3 is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4. Its 18 kW rating and low clamping ratio ensure compliance with aircraft-level transient immunity requirements without additional external filtering.
What is the polarity and marking convention for MAPLAD18KP24AE3?
MAPLAD18KP24AE3 is unidirectional, with the cathode located on the exposed metal base (bottom side) and the anode on the top surface. The device body is marked with "MAPLAD18KP24AE3" and a polarity indicator dot adjacent to the anode end - confirming correct orientation during placement on 24 V DC bus lines.
MAPLAD18KP24AE3 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 463A
- 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
MAPLAD18KP24AE3 FAQ
1.How can I place an order for MAPLAD18KP24AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP24AE3 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 MAPLAD18KP24AE3 reliable?
The price and inventory of MAPLAD18KP24AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP24AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP24AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP24AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP24AE3?
MAPLAD18KP24AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP24AE3 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 MAPLAD18KP24AE3?
For technical support, including MAPLAD18KP24AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP24AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP24AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP24AE3 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 MAPLAD18KP24AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP24AE3?
All MAPLAD18KP24AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP24AE3, 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 MAPLAD18KP24AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP24AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP24AE3 Tags
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