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Microchip Technology MAPLAD18KP170A
- Part No.:
- MAPLAD18KP170A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP170A.pdf
- Description:
- TVS DIODE 170VWM 275VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,026
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Product details
Overview
MAPLAD18KP170A from Microsemi is a surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 170 V reverse standoff voltage (VWM), clamps to ≤275 V at 10 A IPP, and meets RTCA DO-160 Section 22 multi-stroke lightning requirements in aircraft avionics power rails.
For engineers reviewing the MAPLAD18KP170A datasheet, MAPLAD18KP170A pinout, MAPLAD18KP170A application, or MAPLAD18KP170A equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), pin-injection immunity per RTCA/DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4), and high-reliability ESD/EFT suppression in harsh-environment DC bus lines.
Technical Context
The MAPLAD18KP170A is a unidirectional avalanche diode TVS with cathode on the metal baseplate, optimized for low thermal resistance (RθJC = 0.7 °C/W) and rapid clamping response (<100 ps). Its design supports high-duty-cycle surge events under controlled case temperature conditions and integrates with FR4 PCBs using specified pad layout for optimal heat dissipation.
It operates across –55°C to +150°C junction temperature range, complies with AEC-Q101 stress testing, and supports optional MIL-PRF-19500 upscreening (M/MA/MXL levels). Moisture sensitivity is IPC/JEDEC Level 1 - no dry pack required.
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 failure |
| Reverse Standoff Voltage (VWM) | 170 V - maximum continuous DC or peak AC voltage before conduction begins |
| Clamping Voltage (VC) | 275 V @ 10 A IPP - limits downstream circuit voltage during surge to safe level |
| Breakdown Voltage (V(BR)) | 189–209 V @ I(BR) - ensures reliable avalanche initiation above operating voltage |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to heatsink or copper plane |
| Steady-State Power Dissipation | 2.5 W @ TA = 25°C - defines continuous bias capability without derating |
| Temperature Coefficient αV(BR) | 207 mV/°C - quantifies V(BR) drift over temperature for precision system margining |
Pinout & Package
MAPLAD18KP170A uses a surface-mount plastic package with metal baseplate cathode termination. The device has two terminals: anode (top metallization) and cathode (exposed metal bottom surface). Polarity is marked by cathode identification on the body; mounting requires thermal via pattern per recommended pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive input terminal | Connected to protected line; conducts surge current toward cathode during overvoltage |
| Cathode (metal base) | 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 construction | Enables placement on compact avionics PCBs without height clearance issues (max height 0.210 in / 5.33 mm) |
| RTCA DO-160F Waveform 4 compliance | Validated for Level 4 pin injection (6.4/69 μs) - protects against induced transients in flight control wiring |
| AEC-Q101 qualified | Meets automotive-grade reliability screening including HTRB, HTSL, and temperature cycling |
| UL94V-0 epoxy body | Self-extinguishing encapsulation prevents flame propagation in enclosed avionics enclosures |
| MIL-PRF-19500 upscreening option | Supports M/MA/MXL reliability levels for mission-critical defense and space applications |
Applications
| Aircraft Power Distribution Units | Automotive Load Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC bus in airborne power distribution units from multi-stroke lightning surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient clamp on main power rail; absorbs >18 kW pulses without degradation over repeated strikes. Use Value: Enables compliance with FAA airworthiness requirements while maintaining <275 V clamping to safeguard downstream DC-DC converters and controllers. | Use Scenario: Safeguarding engine control unit (ECU) inputs during alternator load dump events in 24 V commercial vehicles. IC Role / Device Role / Timing Role: High-energy TVS placed at ECU power entry point; clamps 120 V transients within nanoseconds. Use Value: Prevents latch-up or destruction of microcontrollers and analog front-ends during ISO 7637-2 Pulse 5a events. |
| Industrial Motor Drive DC Links | Railway Signaling Power Supplies |
Use Scenario: Suppressing switching-induced transients on DC link capacitors in variable-frequency drives operating in factory environments. IC Role / Device Role / Timing Role: Secondary surge protector parallel to bulk capacitance; handles repetitive 10/1000 μs surges from IGBT commutation. Use Value: Extends capacitor lifetime and avoids false triggering of overvoltage protection circuits during normal operation. | Use Scenario: Securing 110 V DC signaling power supplies in trackside electronic interlocking systems exposed to induced lightning currents. IC Role / Device Role / Timing Role: IEC 61000-4-5 Class 4 compliant TVS on supply input; rated for 42 Ω source impedance test condition. Use Value: Guarantees uninterrupted operation during electromagnetic disturbances per EN 50121-4, reducing signal loss in critical safety infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | 600 W PPP rating, 5.0 mm × 6.2 mm SMB package, RθJC ≈ 25 °C/W | Limited to single-stroke surges; not validated for DO-160 Section 22 or IEC 61000-4-5 Class 4 | Select when cost-sensitive, low-energy industrial use cases require RoHS-compliant SMT TVS without aerospace qualification. |
| SMCJ170A | 1500 W PPP, 7.1 mm × 6.2 mm SMC package, RθJC ≈ 15 °C/W | Supports higher single-pulse energy than SMBJ but lacks multi-stroke validation and MIL upscreening options | Choose for automotive or telecom power rails needing robustness beyond SMBJ but below MAPLAD18KP170A's 18 kW capability. |
Compared with SMBJ170A and SMCJ170A, MAPLAD18KP170A provides 30× and 12× higher peak pulse power respectively, certified multi-stroke endurance, and traceable high-reliability screening - making it uniquely suitable for flight-critical and defense-grade surge protection where single-event failure is unacceptable.
Availability
MAPLAD18KP170A is available at Aetrix Electronics and suitable for aircraft power distribution, automotive load dump protection, industrial motor drive DC links, and railway signaling power supplies requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP170A 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 semiconductors for aerospace, defense, and industrial markets, with expertise in radiation-hardened ICs, timing solutions, and discrete protection devices.
The MAPLAD18KP170A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning immunity and mission-critical surge suppression in avionics and transportation systems.
FAQ
What is the clamping voltage of MAPLAD18KP170A at its rated peak pulse current?
The MAPLAD18KP170A has a maximum clamping voltage (VC) of 275 V at 10 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per standard test methods defined in the RF01215 datasheet and ensures downstream components remain within safe operating voltage margins during surge events.
Does MAPLAD18KP170A meet RTCA DO-160F Section 22 lightning requirements?
Yes, MAPLAD18KP170A is specifically validated for RTCA DO-160F Section 22 multi-stroke lightning testing. Its 18,000 W peak pulse power rating, low thermal resistance, and repeatable clamping performance enable compliance with Level 4 and Level 5 pin injection waveforms and full-system lightning strike simulation protocols used in civil aircraft certification.
Is MAPLAD18KP170A RoHS compliant?
Yes, MAPLAD18KP170A is RoHS compliant and carries the "e3" designation in its nomenclature. It uses annealed matte-tin plating on terminals and void-free UL94V-0 epoxy encapsulation, meeting EU Directive 2011/65/EU requirements without lead or other restricted substances.
What is the thermal resistance from junction to case for MAPLAD18KP170A?
The junction-to-case thermal resistance (RθJC) of MAPLAD18KP170A is 0.7 °C/W, measured under specified mounting conditions on FR4 with recommended pad layout. This low value enables effective heat transfer to a heatsink or copper plane, supporting sustained surge handling and long-term reliability in thermally constrained avionics enclosures.
Can MAPLAD18KP170A be used in bidirectional configurations?
No, MAPLAD18KP170A is a unidirectional TVS diode. Bidirectional variants are designated with a "CA" suffix (e.g., MAPLAD18KP170CA). The MAPLAD18KP170A has polarity-specific construction with cathode on the metal baseplate and must be oriented correctly in-circuit to protect against positive-going transients only.
MAPLAD18KP170A 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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 66A
- 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
MAPLAD18KP170A FAQ
1.How can I place an order for MAPLAD18KP170A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP170A 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 MAPLAD18KP170A reliable?
The price and inventory of MAPLAD18KP170A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP170A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP170A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP170A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP170A?
MAPLAD18KP170A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP170A 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 MAPLAD18KP170A?
For technical support, including MAPLAD18KP170A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP170A requirements.
6.How does Aetrix verify that MAPLAD18KP170A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP170A 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 MAPLAD18KP170A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP170A?
All MAPLAD18KP170A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP170A, 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 MAPLAD18KP170A part is unused and in its original packaging.
Return procedure for MAPLAD18KP170A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP170A Tags
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