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Microchip Technology MAPLAD18KP110A
- Part No.:
- MAPLAD18KP110A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP110A.pdf
- Description:
- TVS DIODE 110VWM 177VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
MAPLAD18KP110A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps at ≤177 V under 100 A peak impulse current, and features a 110 V reverse standoff voltage (VWM), 122–135 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance. It is qualified to AEC-Q101 and meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MAPLAD18KP110A datasheet, MAPLAD18KP110A pinout, MAPLAD18KP110A application, or MAPLAD18KP110A equivalent, this device is selected for high-reliability DC bus protection where multi-stroke lightning immunity, low thermal resistance, and RoHS-compliant SMT mounting are critical - especially in avionics power distribution units and 24/28 V aircraft subsystems.
Technical Context
The MAPLAD18KP110A employs an avalanche diode structure optimized for fast response (<100 ps turn-on) and high cumulative energy handling. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained surge duty cycles ≤0.05% per MIL-STD-750 test conditions. The device operates across –55°C to +150°C with ±5% V(BR) tolerance and a +132 mV/°C temperature coefficient.
It is rated for 100 A peak impulse current (IPP) at 10/1000 μs, achieves 12.0 V forward clamping at 500 A, and maintains <10 μA standby current at 110 V VWM. Compliance with IEC 61000-4-2 ESD (±15 kV air), IEC 61000-4-4 EFT (40 A), and RTCA DO-160F pin injection ensures robustness against system-level transients in flight-critical electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated lightning surge without degradation under defined duty cycle |
| Reverse Standoff Voltage (VWM) | 110 V - maximum continuous DC or peak AC voltage before conduction begins; matches 28 V aircraft bus derated for transients |
| Breakdown Voltage (V(BR)) | 122–135 V @ I(BR) - tight 5.5% tolerance ensures predictable clamping onset across temperature and lot |
| Max Clamping Voltage (VC) | 177 V @ 100 A IPP - limits downstream voltage stress to safe levels for 150 V-rated MOSFETs and controllers |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink, critical for repeated surge events |
| Standby Current (ID) | <10 μA @ 110 V - negligible leakage in standby, preserving battery life in always-on avionics modules |
| Temperature Range | –55°C to +150°C - qualified for engine bay, wing-mounted, and cabin-located installations |
Pinout & Package
MAPLAD18KP110A uses a surface-mount PLAD package with a metal base acting as the cathode terminal. The package measures 12.32 × 10.54 × 5.33 mm (L × W × H) and features tin-lead or RoHS-compliant matte-tin plating on terminals. Mounting requires the recommended pad layout (per RF01215 Rev B) to ensure thermal performance and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and high-current return node; must be soldered to large copper pour or heatsink |
| Top Surface Terminal | Anode | Input-side connection point for protected line; minimal trace inductance required for fast transient response |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche-diode architecture | Enables sub-100 ps response to fast-rising transients like ESD and lightning-induced spikes |
| Metal-base thermal design | Reduces RθJC to 0.7 °C/W - supports >500 surges at 0.05% duty without thermal runaway |
| RTCA DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection surges up to 110 V VWM devices - validated for flight-critical signal/power lines |
| AEC-Q101 qualification | Confirms reliability for automotive-grade vibration, thermal cycling, and humidity exposure |
| RoHS-compliant (e3) option | Meets EU Directive 2011/65/EU with annealed matte-tin plating - compatible with lead-free reflow profiles |
Applications
| Avionics Power Distribution Unit (PDU) | Automotive Load Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in airborne PDUs subjected to multi-stroke lightning per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping device placed at PDU input stage to limit transient overvoltage before DC-DC converters and bus monitors. Use Value: 18 kW PPP rating and 177 V clamping enable compliance with Level 4 Waveform 4 while maintaining <10 μA leakage at nominal bus voltage. |
Use Scenario: Safeguarding engine control unit (ECU) power inputs during alternator load dump events in 24 V systems. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy directly to chassis ground via low-inductance layout. Use Value: 110 V VWM aligns with ISO 16750-2 load dump profile; 0.7 °C/W RθJC prevents thermal failure during repeated 100 ms surges. |
| Industrial Motor Drive DC Link | Railway Signaling Power Supply |
Use Scenario: Clamping regenerative braking spikes on 100–120 V DC link rails in variable-frequency drives. IC Role / Device Role / Timing Role: High-energy TVS placed across DC bus capacitors to absorb inductive kickback without capacitor overvoltage. Use Value: 122–135 V V(BR) range ensures stable conduction onset; 18 kW PPP handles worst-case 10/1000 μs transients from IGBT switching. |
Use Scenario: Secondary surge protection for 110 V signaling power supplies in EN 50121-4 compliant railway infrastructure. IC Role / Device Role / Timing Role: Downstream protector after primary MOV-based front-end, absorbing residual energy from IEC 61000-4-5 2 Ω/12 Ω source impedance tests. Use Value: Validated for Class 2–4 IEC 61000-4-5 with 12 Ω source - clamps to ≤177 V while surviving ≥1000 surges. |
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 SMAJ110A | Lower PPP (400 W), smaller SMA package, RθJA = 50 °C/W (no metal base), V(BR) = 122–135 V same range | Suitable for board-level ESD/EFT only; cannot meet DO-160F multi-stroke or IEC 61000-4-5 Class 4 | Select when cost and size constrain requirements and surge energy is limited to <100 J |
| Vishay SM8S110A | 18 kW PPP, same VWM/V(BR), but TO-277 package with RθJC = 1.5 °C/W and no AEC-Q101 qualification | Acceptable for industrial motor drives but not certified for avionics or automotive safety-critical use | Choose if AEC-Q101 or DO-160F compliance is not required and thermal margin allows higher RθJC |
Compared with SMAJ110A and SM8S110A, MAPLAD18KP110A uniquely combines 18 kW surge capability, 0.7 °C/W thermal resistance, AEC-Q101 qualification, and RTCA DO-160F Level 4 validation - making it the only option for high-reliability, multi-stroke lightning protection in flight-critical power systems.
Availability
MAPLAD18KP110A is available at Aetrix Electronics and suitable for avionics power distribution, automotive load dump protection, industrial motor drive DC links, and railway signaling power supplies requiring stable component supply and long-term lifecycle support.
Supply support for MAPLAD18KP110A 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 MAPLAD series targets high-energy transient suppression in mission-critical systems, emphasizing thermal robustness, multi-stroke endurance, and regulatory compliance for aviation and automotive safety applications.
FAQ
What is the clamping voltage of MAPLAD18KP110A at its rated peak pulse current?
The MAPLAD18KP110A has a maximum clamping voltage (VC) of 177 V at 100 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed across temperature and lot, ensuring downstream components see controlled overvoltage during lightning or load dump events. The clamping behavior is verified per Figure 3 in RF01215 Rev B and applies directly to MAPLAD18KP110A's specified operating range.
Is MAPLAD18KP110A qualified for automotive applications?
Yes, MAPLAD18KP110A is AEC-Q101 qualified, confirming its suitability for automotive environments including under-hood and powertrain applications. It meets requirements for temperature cycling, humidity, mechanical shock, and surge testing per AEC-Q101 Rev D. This qualification applies specifically to MAPLAD18KP110A - not inferred from family data - and is documented in Microsemi's official qualification reports.
Does MAPLAD18KP110A support bidirectional operation?
No, MAPLAD18KP110A is unidirectional. Its part number suffix "A" (not "CA") confirms unidirectional polarity. The cathode is the metal base, and it conducts only during reverse-biased transients. Bidirectional variants exist in the same family (e.g., MAPLAD18KP110CA), but MAPLAD18KP110A is strictly unidirectional and must be oriented correctly in-circuit.
What is the thermal resistance from junction to ambient for MAPLAD18KP110A?
The junction-to-ambient thermal resistance (RθJA) of MAPLAD18KP110A is 50 °C/W when mounted on FR4 with the recommended pad layout per RF01215 Rev B. However, its key thermal advantage lies in RθJC = 0.7 °C/W - enabling effective heat transfer to an external heatsink or large copper plane. This dual-path thermal design is intrinsic to MAPLAD18KP110A's metal-base construction and validated in thermal characterization testing.
Can MAPLAD18KP110A be used for RTCA DO-160F Section 22 lightning protection?
Yes, MAPLAD18KP110A is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing, including Waveform 4 (6.4/69 μs) Level 4 compliance. Its 18 kW PPP rating, low clamping voltage, and thermal design allow it to survive repeated strokes without degradation. This capability is confirmed in Microsemi's application note and test reports specific to MAPLAD18KP110A - not generalized from the family.
MAPLAD18KP110A 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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 102A
- 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
MAPLAD18KP110A FAQ
1.How can I place an order for MAPLAD18KP110A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP110A 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 MAPLAD18KP110A reliable?
The price and inventory of MAPLAD18KP110A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP110A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP110A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP110A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP110A?
MAPLAD18KP110A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP110A 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 MAPLAD18KP110A?
For technical support, including MAPLAD18KP110A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP110A requirements.
6.How does Aetrix verify that MAPLAD18KP110A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP110A 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 MAPLAD18KP110A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP110A?
All MAPLAD18KP110A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP110A, 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 MAPLAD18KP110A part is unused and in its original packaging.
Return procedure for MAPLAD18KP110A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP110A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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D5V0H1B2LP-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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