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Microchip Technology MAPLAD18KP24A
- Part No.:
- MAPLAD18KP24A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,543
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Product details
Overview
MAPLAD18KP24A 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, clamps at ≤38.9 V under 463 A peak impulse current, and features a 24 V reverse standoff voltage (VWM) with 26.7–29.5 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection and IEC 61000-4-5 Class 1–5 secondary lightning protection.
For engineers reviewing the MAPLAD18KP24A datasheet, MAPLAD18KP24A pinout, MAPLAD18KP24A application, or MAPLAD18KP24A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant packaging, and multi-stroke lightning resilience are critical - especially in avionics power distribution units and 24 V vehicle electronics.
Technical Context
The MAPLAD18KP24A employs an avalanche diode structure optimized for fast response (<100 ps rise time) and stable clamping under repetitive transients. Its metal-base cathode construction enables direct thermal coupling to heatsinks, supporting sustained operation at TJ up to +150 °C with junction-to-case thermal resistance of just 0.7 °C/W.
It is rated for 100% surge testing per lot, with 3σ screening on standby current (ID ≤10 μA @ 24 V), and supports both standard FR4 PCB mounting (with defined pad layout) and optional MIL-PRF-19500 upscreening for high-reliability programs requiring traceable wafer lots and conformance inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated lightning surge energy without degradation |
| Reverse Standoff Voltage (VWM) | 24 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (V(BR)) | 26.7–29.5 V @ I(BR) - defines reliable avalanche onset threshold across temperature |
| Max Clamping Voltage (VC) | 38.9 V @ IPP = 463 A - limits downstream component stress during worst-case surge |
| Standby Current (ID) | ≤10 μA @ 24 V - ensures negligible leakage in always-on 24 V systems |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to external heatsink or copper plane |
| Surge Rating Standard | RTCA DO-160F Waveform 4 Level 4 - validated for aircraft pin-injection immunity |
Pinout & Package
The MAPLAD18KP24A uses a surface-mount plastic package with void-free UL94V-0 epoxy body and tin-lead or RoHS-compliant matte-tin plating. The cathode is the metal base (bottom side); anode is the top-side metallized terminal. Recommended pad layout per RF01215 Rev B ensures optimal thermal dissipation and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top-side metallization) | Positive input node for unidirectional clamping | Connected to protected line (e.g., 24 V rail); conducts only during reverse surge |
| Cathode (Metal base / bottom) | Reference/ground return path | Must be soldered to large copper area or heatsink for thermal management and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package | 0.470″ × 0.230″ × 0.100″ (11.94 × 5.85 × 2.44 mm) - fits space-constrained avionics modules |
| Thermal resistance optimization | RθJC = 0.7 °C/W - reduces junction temperature rise by >70% vs. standard SMD TVS |
| Multi-standard compliance | IEC 61000-4-2/4-4/4-5, RTCA DO-160F Waveforms 4 & 5A - single-device coverage for ESD, EFT, and lightning |
| Lot-traceable reliability | Wafer fabrication and assembly lot traceability + 100% surge testing - required for aerospace DO-160 certification |
| Moisture sensitivity | IPC/JEDEC J-STD-020B Level 1 - no dry pack or baking required prior to reflow |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC power bus in flight control actuator electronics exposed to DO-160F Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary transient suppression device placed at bus entry point to clamp surges before they reach FPGAs, ADCs, and motor drivers. Use Value: Enables compliance with RTCA DO-160F Level 4 pin injection (6.4/69 μs) while maintaining <38.9 V clamping to protect 3.3 V/5 V logic rails via local regulation. | Use Scenario: 24 V battery-fed engine control unit subjected to ISO 7637-2 Load Dump pulses up to 60 V/100 ms. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly across input terminals to absorb 18 kW surge energy without failure. Use Value: Prevents latch-up or destruction of upstream DC/DC converters by limiting transient voltage to ≤38.9 V within 100 ps, preserving system uptime. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: 24 V auxiliary supply in variable-frequency drive cabinet exposed to switching transients from IGBT commutation. IC Role / Device Role / Timing Role: Secondary protection stage after bulk capacitance, absorbing high-di/dt induced spikes on control power rails. Use Value: Withstands repetitive 0.05% duty-cycle surges per Figure 2, enabling long-term reliability in harsh factory environments. | Use Scenario: 24 V signaling interface between trackside sensors and centralized interlocking system subject to induced RFI and EFT. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MAPLAD18KP24CA) used for differential pair protection; unidirectional MAPLAD18KP24A applied to single-ended power lines. Use Value: Meets EN 50121-3-2 immunity requirements for rolling stock electronics with verified 42 Ω source impedance IEC 61000-4-5 Class 4 performance. |
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 (onsemi) | 600 W PPP rating, 38.9 V clamping at 15.7 A - 30× lower peak power handling | Only suitable for low-energy ESD/EFT; cannot meet DO-160F lightning or load dump | Select MAPLAD18KP24A when surge energy exceeds 100 mJ or peak current exceeds 100 A |
| SMCJ24A (Littelfuse) | 1500 W PPP, 38.9 V clamping at 38.9 A - 12× lower power than MAPLAD18KP24A | Limited to automotive infotainment or non-safety ECUs; fails under multi-stroke lightning test | MAPLAD18KP24A is required for certified aerospace or heavy-duty industrial deployments demanding 18 kW validation |
Compared with SMBJ24A and SMCJ24A, the MAPLAD18KP24A provides three orders of magnitude higher peak pulse power, validated clamping performance under RTCA DO-160F and IEC 61000-4-5, and integrated thermal design for sustained high-current operation - making it irreplaceable in safety-critical power rail protection.
Availability
MAPLAD18KP24A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive DC link applications requiring stable component supply, long-lifecycle support, and certified surge resilience.
Supply support for MAPLAD18KP24A 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 MAPLAD18KP24A - was engineered specifically for high-power, low-inductance transient suppression in mission-critical platforms where thermal stability, multi-stroke endurance, and regulatory compliance are non-negotiable.
FAQ
What is the clamping voltage of MAPLAD18KP24A at its rated peak pulse current?
The MAPLAD18KP24A has a maximum clamping voltage (VC) of 38.9 V at its peak pulse current (IPP) of 463 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and ensures downstream 24 V system components remain within safe operating voltage margins during surge events. The MAPLAD18KP24A achieves this with sub-100 ps response time and minimal overshoot due to its low-parasitic metal-base construction.
Is MAPLAD18KP24A compliant with automotive qualification standards?
Yes, MAPLAD18KP24A is qualified to AEC-Q101 for discrete semiconductors, covering stress tests including HTRB, HTGB, and surge. It is widely deployed in automotive 24 V systems for load dump protection, meeting ISO 7637-2 Pulse 5a/b requirements when properly mounted with thermal relief. The MAPLAD18KP24A's 18,000 W rating exceeds typical load dump energy by >5×, providing robust margin for extended service life.
How does the thermal design of MAPLAD18KP24A differ from standard SMD TVS diodes?
The MAPLAD18KP24A uses a metal-base cathode architecture that directly interfaces with PCB copper or external heatsinks, achieving a junction-to-case thermal resistance (RθJC) of just 0.7 °C/W - over 70% lower than conventional SMD TVS packages. This allows the MAPLAD18KP24A to sustain repeated 18 kW surges without thermal runaway, unlike standard SMB/SMC devices limited to <1.5 W steady-state dissipation. Mounting pad layout per RF01215 Rev B is mandatory to realize this benefit.
Can MAPLAD18KP24A be used for bidirectional protection?
No - MAPLAD18KP24A is unidirectional. For bidirectional protection, the functionally matched part is MAPLAD18KP24CA (with 'CA' suffix), which provides symmetrical clamping for AC-coupled or floating signal lines. Both share identical PPP, VWM, and thermal specs, but MAPLAD18KP24A must only be used in DC circuits where polarity is fixed and the cathode connects to ground or lowest potential. Using MAPLAD18KP24A in bidirectional configurations risks catastrophic failure.
What certifications and standards does MAPLAD18KP24A meet?
MAPLAD18KP24A is tested and documented to meet RTCA DO-160F Section 22 (lightning-induced transient) Level 4 pin injection, IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) Class 1–5 with 42 Ω, 12 Ω, and 2 Ω source impedances. It also complies with AEC-Q101, IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, and RoHS Directive 2011/65/EU (e3 marking). Full test reports are available upon request for MAPLAD18KP24A.
MAPLAD18KP24A 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
MAPLAD18KP24A FAQ
1.How can I place an order for MAPLAD18KP24A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP24A 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 MAPLAD18KP24A reliable?
The price and inventory of MAPLAD18KP24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP24A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP24A?
MAPLAD18KP24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP24A 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 MAPLAD18KP24A?
For technical support, including MAPLAD18KP24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP24A requirements.
6.How does Aetrix verify that MAPLAD18KP24A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP24A 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 MAPLAD18KP24A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP24A?
All MAPLAD18KP24A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP24A, 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 MAPLAD18KP24A part is unused and in its original packaging.
Return procedure for MAPLAD18KP24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP24A Tags
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