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Microchip Technology MAPLAD18KP48A
- Part No.:
- MAPLAD18KP48A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP48A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,728
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Product details
Overview
MAPLAD18KP48A 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 ≤77.4 V under 233 A peak impulse current, and features a 48 V reverse standoff voltage (VWM) with 53.3–58.9 V breakdown range. 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 MAPLAD18KP48A datasheet, MAPLAD18KP48A pinout, MAPLAD18KP48A application, or MAPLAD18KP48A equivalent, key selection criteria include its 48 V working voltage, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and validated performance under multi-stroke lightning transients per DO-160 Section 22.
Technical Context
The MAPLAD18KP48A employs an avalanche diode structure optimized for fast response (<100 ps turn-on) and high-energy dissipation in a low-profile thermoset epoxy package. Its metal-base cathode construction enables direct thermal coupling to PCB copper or heatsinks, supporting sustained surge handling under ≤0.05% duty cycle conditions.
It operates across –55°C to +150°C junction temperature, with standby leakage ≤10 μA at 48 V, and is qualified to AEC-Q101. The device is rated for 1500 A forward surge current and maintains clamping stability across IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT, and pin-injection transients per DO-160F.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 48 V - maximum continuous DC or peak AC voltage before conduction |
| Breakdown Voltage (V(BR)) | 53.3–58.9 V @ I(BR) - ensures reliable avalanche initiation above operating rail |
| Max Clamping Voltage (VC) | 77.4 V @ 233 A - limits downstream circuit voltage during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Standby Leakage Current | ≤10 μA @ 48 V - negligible power loss in always-on 48 V systems |
| Surge Current Rating (IPP) | 233 A (10/1000 μs) - validated per IEC 61000-4-5 with 42 Ω source impedance |
Pinout & Package
MAPLAD18KP48A uses a surface-mount plastic package with metal base cathode configuration. The cathode is the exposed metal bottom surface; the anode is the top-side metallized pad. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), compliant with IPC/JEDEC J-STD-020B moisture level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side pad) | Positive surge return path | Connected to protected line (e.g., 48 V bus); conducts surge current into device |
| Cathode (metal base) | Reference/ground node | Must be soldered to large copper pour or heatsink for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package | Enables placement on high-density PCBs while maintaining 18 kW surge capability |
| 0.7 °C/W RθJC | Reduces thermal derating impact-supports >90% of rated PPP at TC = 100°C |
| DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin injection transients up to 25°C ambient |
| AEC-Q101 qualification | Guarantees reliability for automotive 48 V mild-hybrid and ADAS power rails |
| e3 RoHS-compliant plating | Matte-tin termination ensures solderability and long-term intermetallic stability |
Applications
| Aerospace Avionics Power Bus Protection | Automotive 48 V Mild-Hybrid Systems |
|---|---|
Use Scenario: Protecting ARINC 429 data lines and 28 V/48 V distribution buses against lightning-induced transients in commercial aircraft. IC Role / Device Role / Timing Role: Primary transient suppression device placed at board-level entry points to limit voltage excursions below 80 V during DO-160 Section 22 multi-stroke events. Use Value: Enables compliance with RTCA DO-160F Waveform 4 Level 4 without external heatsinking or derating penalties. | Use Scenario: Safeguarding DC-DC converters, battery management units, and electric turbochargers in 48 V vehicle architectures. IC Role / Device Role / Timing Role: Unidirectional TVS clamping load-dump spikes (ISO 16750-2) and alternator transients on main power rails. Use Value: Withstands 1500 A forward surge current and maintains <77.4 V clamping at 233 A-prevents MOSFET gate oxide rupture and controller latch-up. |
| Industrial Motor Drive DC Link Protection | Railway Signaling Power Interface |
Use Scenario: Shielding IGBT gate drivers and MCU power supplies from switching-induced voltage spikes in variable-frequency drives. IC Role / Device Role / Timing Role: Fast-response (sub-100 ps) clamping element placed adjacent to power stage output terminals. Use Value: Low RθJC (0.7 °C/W) allows direct thermal coupling to copper plane-eliminates need for discrete thermal vias or interface pads. | Use Scenario: Securing 48 V signaling interfaces in ERTMS/ETCS Level 2 trackside equipment exposed to induced surges from nearby traction currents. IC Role / Device Role / Timing Role: Secondary lightning protector per IEC 61000-4-5 Class 3 (42 Ω source) on fieldbus and sensor inputs. Use Value: Validated for 233 A IPP at 48 V standoff-meets EN 50121-4 immunity requirements without derating at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48A | 600 W PPP rating, 70 V VC @ 10.3 A IPP - 30× lower energy capacity | Only suitable for consumer-grade I/O protection; fails under DO-160 or ISO 16750-2 load dump | Select MAPLAD18KP48A when system-level surge testing requires ≥18 kW capability and AEC-Q101 qualification. |
| SMCJ48A | 1500 W PPP, 77.4 V VC @ 19.3 A IPP - 12× lower peak power than MAPLAD18KP48A | Lacks DO-160F Waveform 4 validation and has higher thermal resistance (RθJC ≈ 2.5 °C/W) | MAPLAD18KP48A is required for aerospace and high-reliability industrial deployments where multi-stroke endurance matters. |
Compared with SMBJ48A and SMCJ48A, MAPLAD18KP48A provides 30× and 12× higher peak pulse power respectively, validated clamping performance under RTCA DO-160F, and superior thermal management-making it the only option for certified lightning protection in safety-critical 48 V platforms.
Availability
MAPLAD18KP48A is available at Aetrix Electronics and suitable for aerospace avionics, automotive 48 V mild-hybrid systems, and industrial motor drive applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for MAPLAD18KP48A 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 MAPLAD18KP48A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for certified lightning and load-dump protection in safety-critical 28–200 V systems.
FAQ
What is the clamping voltage of MAPLAD18KP48A at its rated peak pulse current?
The MAPLAD18KP48A has a maximum clamping voltage (VC) of 77.4 V at 233 A peak pulse current (IPP), measured under standard 10/1000 μs waveform conditions. This value ensures downstream 48 V-rated components remain within safe operating voltage margins during surge events. The MAPLAD18KP48A maintains this clamping performance across its full operating temperature range (–55°C to +150°C) and is validated per IEC 61000-4-5 test configurations.
Is MAPLAD18KP48A qualified for automotive use?
Yes, MAPLAD18KP48A is AEC-Q101 qualified and explicitly rated for automotive 48 V mild-hybrid applications including load-dump protection per ISO 16750-2. Its 1500 A forward surge current rating, 48 V standoff, and low thermal resistance make it suitable for protecting DC-DC converters and battery management ICs. The MAPLAD18KP48A also supports extended temperature operation up to +150°C junction, meeting under-hood reliability requirements.
Does MAPLAD18KP48A meet RTCA DO-160 lightning standards?
Yes, MAPLAD18KP48A is validated for RTCA DO-160F Section 22 multi-stroke lightning testing, specifically Waveform 4 (6.4/69 μs) Level 4 at 25°C ambient. It is also rated for Waveform 5A (40/120 μs) Level 4 up to 36 V variants, and supports full DO-160 compliance when used with appropriate PCB layout (e.g., minimum 100 mm² copper pour under cathode). The MAPLAD18KP48A's 18,000 W rating directly addresses aircraft-level surge energy requirements.
What is the thermal resistance and how should MAPLAD18KP48A be mounted for optimal cooling?
MAPLAD18KP48A has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W. For optimal cooling, the metal cathode base must be soldered to a minimum 100 mm² copper area on the PCB, preferably with ≥6 thermal vias (0.3 mm diameter) connecting to inner ground planes. Mounting on FR4 with recommended pad layout (per RF01215 Rev B) achieves the specified 50 °C/W junction-to-ambient rating. The MAPLAD18KP48A's low RθJC eliminates need for external heatsinks in most 48 V applications.
How does MAPLAD18KP48A differ from standard SMCJ48A TVS diodes?
MAPLAD18KP48A delivers 18,000 W peak pulse power-12× higher than SMCJ48A's 1500 W-and features 0.7 °C/W RθJC versus ~2.5 °C/W for SMCJ48A. It is AEC-Q101 qualified, DO-160F Waveform 4 Level 4 validated, and rated for 233 A IPP (vs. 19.3 A for SMCJ48A). The MAPLAD18KP48A's metal-base construction and low-profile epoxy package enable aerospace-grade reliability unattainable with standard SMC packages.
MAPLAD18KP48A 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 233A
- 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
MAPLAD18KP48A FAQ
1.How can I place an order for MAPLAD18KP48A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP48A 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 MAPLAD18KP48A reliable?
The price and inventory of MAPLAD18KP48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP48A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP48A?
MAPLAD18KP48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP48A 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 MAPLAD18KP48A?
For technical support, including MAPLAD18KP48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP48A requirements.
6.How does Aetrix verify that MAPLAD18KP48A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP48A 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 MAPLAD18KP48A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP48A?
All MAPLAD18KP48A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP48A, 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 MAPLAD18KP48A part is unused and in its original packaging.
Return procedure for MAPLAD18KP48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP48A Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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