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Microchip Technology MAPLAD18KP28AE3
- Part No.:
- MAPLAD18KP28AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP28AE3.pdf
- Description:
- TVS DIODE 28VWM 45.5VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,689
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Product details
Overview
MAPLAD18KP28AE3 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 ≤45.5 V under 396 A peak impulse current, and features a 28 V reverse standoff voltage (VWM), 31.1–34.4 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance.
For engineers reviewing the MAPLAD18KP28AE3 datasheet, MAPLAD18KP28AE3 pinout, MAPLAD18KP28AE3 application, or MAPLAD18KP28AE3 equivalent, this device is selected for lightning protection per RTCA DO-160 Section 22, secondary ESD/EFT/IEC 61000-4-5 compliance, and high-reliability load dump suppression where low-profile SMT mounting and traceable wafer lot control are required.
Technical Context
This TVS diode uses silicon avalanche technology to provide fast-response clamping (<100 ps rise time) with precise breakdown voltage tolerance (±5% on V(BR)) and stable temperature coefficient (30 mV/°C). Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under multi-stroke surge conditions.
The device meets AEC-Q101 stress testing requirements and supports MIL-PRF-19500 upscreening options. It is rated for IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning) with 2 Ω, 12 Ω, and 42 Ω source impedances - validated for Class 2–5 pin injection per RTCA/DO-160F Waveforms 4 and 5A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 28 V - maximum continuous operating voltage before clamping initiates |
| Breakdown Voltage (V(BR)) | 31.1–34.4 V @ I(BR) - tight tolerance ensures predictable turn-on across temperature |
| Clamping Voltage (VC) | ≤45.5 V @ 396 A - limits downstream circuit voltage during worst-case transients |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Standby Current (ID) | ≤10 μA @ 28 V - negligible leakage in standby, critical for low-power monitoring circuits |
| Moisture Sensitivity Level | Level 1 (IPC/JEDEC J-STD-020B) - no dry pack or bake required prior to reflow |
Pinout & Package
MAPLAD18KP28AE3 uses a surface-mount plastic package with metal baseplate (cathode) and single anode terminal. The cathode is the metal backside (package bottom); polarity is marked on body. Package dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), weight ≈1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top side) | Surge current entry point for unidirectional conduction | Connected to protected line; conducts only when voltage exceeds V(BR) in forward direction |
| Cathode (metal base) | Surge current return path and thermal interface | Must be soldered to large copper pour or heatsink for thermal management and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating | Validated for multi-stroke lightning per RTCA DO-160 Section 22 - supports repeated aircraft system exposure |
| Low-profile SMT package | Height ≤3.94 mm - fits constrained avionics enclosures while enabling automated assembly |
| Wafer-level lot traceability | Full fabrication and assembly batch tracking - required for aerospace configuration management and FAI reporting |
| RoHS-compliant (e3) | Matte-tin plating per MIL-STD-750 Method 2026 - ensures reliable solderability and long-term corrosion resistance |
| AEC-Q101 qualified | Stress-tested per automotive reliability standard - suitable for under-hood and EV powertrain applications |
Applications
| Aerospace Avionics Power Bus Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses in flight control computers and sensor interfaces against induced lightning transients. IC Role / Device Role / Timing Role: Primary clamping element placed at bus entry point to limit voltage excursion during DO-160 Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs). Use Value: Enables Level 4/5 compliance without derating at 25°C; clamps below 45.5 V to preserve 5 V and 3.3 V logic supply integrity. |
Use Scenario: Safeguarding engine control units (ECUs) and ADAS modules during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-energy shunt device mounted directly at ECU input connector to absorb >100 J surges within microseconds. Use Value: Withstands 396 A peak current and 18 kW pulses while maintaining <10 μA leakage - avoids false resets in always-on modules. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Interface Protection |
Use Scenario: Shielding gate drivers and current sensors on 24–48 V DC link rails from switching-induced transients in servo inverters. IC Role / Device Role / Timing Role: Fast-clamping TVS placed across DC link capacitors to suppress dV/dt spikes from IGBT commutation. Use Value: Sub-100 ps response time prevents latch-up in isolated gate drivers; 0.7 °C/W RθJC allows direct mounting to aluminum heatsink. |
Use Scenario: Securing 24 V signaling lines in train control systems against EFT bursts and lightning-induced surges per EN 50121-3-2. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy from IEC 61000-4-5 42 Ω tests. Use Value: Validated for Class 3/4/5 with 42 Ω source impedance - reduces clamping overshoot by >30% vs. standard 600 W TVS diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ28A | 600 W PPP rating, SMA package, 400 A IPP max, RθJA = 50 °C/W (no metal base) | Limited to single-stroke surges; unsuitable for DO-160 multi-stroke or automotive load dump | Select only for cost-sensitive, low-energy consumer electronics with <1 kV surge exposure |
| Vishay V28MLA0603NH | 1200 W MLC rating, 0603 multilayer varistor, no specified DO-160 or AEC-Q101 qualification | No thermal path to heatsink; derates rapidly above 85°C ambient; not traceable | Use only for board-level ESD suppression on signal lines - not for power rail clamping |
Compared with SMAJ28A and V28MLA0603NH, MAPLAD18KP28AE3 provides 30× higher pulse power, metal-base thermal management, full aerospace qualification, and lot-level traceability - making it the sole option for certified aviation and high-reliability automotive power protection.
Availability
MAPLAD18KP28AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive powertrain, and industrial motor drive applications requiring stable component supply, long-lifecycle support, and full traceability.
Supply support for MAPLAD18KP28AE3 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) designs high-reliability analog, mixed-signal, and power semiconductors for aerospace, defense, and industrial markets.
The MAPLAD18KP28AE3 belongs to Microsemi's PLAD high-power TVS family, engineered specifically for certified lightning and load dump protection in safety-critical systems where thermal robustness and qualification compliance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP28AE3 at its rated peak pulse current?
The MAPLAD18KP28AE3 has a maximum clamping voltage (VC) of 45.5 V at 396 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream 24 V electronics remain within safe operating limits during surge events. The clamping performance is guaranteed across -55°C to +150°C junction temperature range.
Is MAPLAD18KP28AE3 qualified for automotive applications?
Yes, MAPLAD18KP28AE3 is tested and qualified to AEC-Q101 for stress reliability, including high-temperature operating life, temperature cycling, and surge testing. It is explicitly recommended for automotive load dump protection (ISO 7637-2 Pulse 5a) and meets ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) standards. Its 28 V VWM aligns with nominal 24 V vehicle electrical systems.
How is polarity identified on MAPLAD18KP28AE3?
MAPLAD18KP28AE3 is unidirectional, with the cathode located on the metal baseplate (bottom surface) and the anode on the top-side metallization. Polarity is marked on the device body per Microsemi's standard marking convention. Correct orientation requires the metal base to be soldered to ground or low-impedance return plane - reversing polarity will prevent clamping function.
Does MAPLAD18KP28AE3 require moisture preconditioning before reflow?
No, MAPLAD18KP28AE3 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions and does not require dry packing, baking, or floor-life controls prior to reflow soldering. This eliminates handling overhead and supports just-in-time manufacturing for high-reliability programs.
What thermal management is required for MAPLAD18KP28AE3 in continuous surge environments?
MAPLAD18KP28AE3 relies on its 0.7 °C/W junction-to-case thermal resistance and must be mounted with the metal baseplate soldered to ≥250 mm² of 2 oz copper on FR4, or directly to an external heatsink. For multi-stroke applications (e.g., RTCA DO-160), thermal derating per Figure 6 in RF01215 Rev B applies - steady-state power dissipation drops to 71 W at TC = 100°C.
MAPLAD18KP28AE3 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.5V
- Current - Peak Pulse (10/1000µs):
- 396A
- 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
MAPLAD18KP28AE3 FAQ
1.How can I place an order for MAPLAD18KP28AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP28AE3 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 MAPLAD18KP28AE3 reliable?
The price and inventory of MAPLAD18KP28AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP28AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP28AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP28AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP28AE3?
MAPLAD18KP28AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP28AE3 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 MAPLAD18KP28AE3?
For technical support, including MAPLAD18KP28AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP28AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP28AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP28AE3 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 MAPLAD18KP28AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP28AE3?
All MAPLAD18KP28AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP28AE3, 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 MAPLAD18KP28AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP28AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP28AE3 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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