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Microchip Technology MAPLAD18KP170CA
- Part No.:
- MAPLAD18KP170CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP170CA.pdf
- Description:
- TVS DIODE 170VWM 275VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,197
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Product details
Overview
MAPLAD18KP170CA from Microsemi is a bidirectional 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 ≤275 V under 100 A peak impulse current, and features a 170 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (189–209 V). 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 MAPLAD18KP170CA datasheet, MAPLAD18KP170CA pinout, MAPLAD18KP170CA application, or MAPLAD18KP170CA equivalent, this device is selected for high-reliability DC bus protection where multi-stroke lightning immunity, low thermal resistance (RθJC = 0.7 °C/W), and RoHS-compliant SMT mounting are mandatory - especially in avionics power distribution units and 24/28 V aircraft subsystems.
Technical Context
This TVS uses an avalanche diode structure optimized for fast response (<5 ns clamping time) and high cumulative energy handling across repeated transients. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation under 0.05% duty-cycle impulses per Figure 1.
The bidirectional construction allows symmetrical clamping on both polarities without external polarity management. It complies with IEC 61000-4-2 ESD (±15 kV air/±8 kV contact), IEC 61000-4-4 EFT (40 A), and IEC 61000-4-5 surge (42 Ω source, Class 5) - all verified per production lot testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation in single-event or multi-stroke scenarios |
| Reverse Standoff Voltage (VWM) | 170 V - maximum continuous DC or peak AC voltage before conduction begins; matches 24/28 V aircraft bus with safety margin |
| Breakdown Voltage (V(BR)) | 189–209 V @ I(BR) - tight 5% tolerance ensures predictable turn-on and avoids false triggering near operating rail |
| Max Clamping Voltage (VC) | 275 V @ 100 A - limits downstream voltage stress to safe levels for 200 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 repetitive surge duty |
| Clamping Response Time | <5 ns - suppresses fast-rising transients (e.g., inductive switch-off, EFT bursts) before sensitive circuitry reacts |
| Steady-State Power Dissipation | 71 W @ TC = 100°C - supports continuous thermal management when mounted on heatsink per spec |
Pinout & Package
MAPLAD18KP170CA uses a surface-mount PLAD package with metal base acting as cathode terminal for bidirectional operation. The package measures 12.32 × 10.54 × 5.08 mm (L × W × H) with void-free UL94V-0 epoxy body and matte-tin plated terminals solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Top Surface Pads (2) | Anode / Cathode (symmetrical) | Bidirectional conduction path - either pad may serve as input; no polarity orientation required during placement |
| Metal Base (Bottom) | Common Cathode Terminal | Primary thermal path and electrical return - must be soldered to large copper pour or heatsink for RθJC = 0.7 °C/W performance |
Key Features
| Feature | Design Value |
|---|---|
| RTCA DO-160F Waveform 4 Level 4 compliance | Validated for 6.4/69 μs pin-injection surges up to 170 V standoff - essential for avionics interface protection |
| AEC-Q101 qualification | Qualified for automotive-grade reliability including temperature cycling, HAST, and surge lifetime testing |
| IEC 61000-4-5 Class 5 support (42 Ω source) | Withstands 4 kV surge with 42 Ω source impedance - meets highest secondary lightning protection tier for aircraft |
| Moisture Sensitivity Level 1 | No dry pack or baking required prior to reflow - simplifies SMT assembly and reduces process risk |
| RoHS-compliant (e3 marking) | Lead-free matte-tin plating compatible with Pb-free soldering profiles up to 260°C for 10 s |
Applications
| Aircraft Power Distribution Units | Automotive Load Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs in flight control computers and environmental control systems against lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient clamp placed directly at connector entry point to limit voltage excursion before upstream filtering. Use Value: Enables compliance with RTCA DO-160F Waveform 4 Level 4 and Class 5 IEC 61000-4-5 while maintaining <5 ns response to preserve signal integrity of 100 kHz PWM control lines. |
Use Scenario: Safeguarding engine control modules (ECMs) and battery management systems during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: High-power shunt protector across main power rail, absorbing up to 18 kW surge energy without failure. Use Value: Prevents latch-up or destruction of 40 V-rated power MOSFETs by clamping peak voltage to 275 V at 100 A, well below device breakdown limits. |
| Industrial Motor Drive DC Links | Railway Signaling Power Supplies |
Use Scenario: Securing DC link capacitors in variable-frequency drives exposed to regenerative braking spikes and grid transients. IC Role / Device Role / Timing Role: Bidirectional clamp across +DC/–DC rails to suppress both positive and negative polarity surges from inductive kickback. Use Value: Eliminates need for dual unidirectional devices - reduces BOM count and PCB area while delivering matched clamping in both directions. |
Use Scenario: Hardening 110 V DC signaling power supplies in train control systems against traction current switching transients and EMI coupling. IC Role / Device Role / Timing Role: Secondary surge protector downstream of primary MOV-based front-end, providing precise voltage limiting and fast recovery. Use Value: Achieves <100 ns total system response with coordinated staging, meeting EN 50121-3-2 immunity requirements for rolling stock electronics. |
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 SMAJ170CA | Lower PPP rating (400 W), smaller SMA package, higher RθJA (65 °C/W), no AEC-Q101 or DO-160 qualification | Suitable only for low-energy industrial I/O protection - not rated for multi-stroke lightning or automotive load dump | Select when cost and size dominate, and surge energy is limited to <500 W per event |
| Vishay V275LA20AP | MOV-based, 275 V AC RMS rating, slower response (>25 ns), no bidirectional DC clamping specification, higher leakage | Designed for AC mains protection; lacks DC standoff precision and fast clamping needed for avionics 28 V bus | Choose only for AC-coupled or non-critical 24 V systems where sub-5 ns response is not required |
Compared with SMAJ170CA and V275LA20AP, MAPLAD18KP170CA uniquely combines 18 kW surge capacity, DO-160F/IEC 61000-4-5 certification, and bidirectional SMT packaging - making it the only option qualified for high-reliability airborne DC power rail protection.
Availability
MAPLAD18KP170CA is available at Aetrix Electronics and suitable for aircraft power distribution, automotive ECM protection, and industrial motor drive DC link stabilization requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP170CA 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MAPLAD series was developed specifically for high-energy transient suppression in mission-critical DC power systems where multi-stroke lightning resilience, thermal robustness, and qualification-grade traceability are mandatory.
FAQ
What is the maximum clamping voltage of MAPLAD18KP170CA at its rated peak pulse current?
The MAPLAD18KP170CA has a maximum clamping voltage (VC) of 275 V when subjected to a 100 A peak impulse current under 10/1000 μs waveform conditions. This value is guaranteed across the full operating temperature range and ensures downstream components rated for 300 V or higher remain within safe operating limits during surge events.
Is MAPLAD18KP170CA qualified for automotive applications?
Yes, MAPLAD18KP170CA is AEC-Q101 qualified, confirming its suitability for automotive under-hood and powertrain applications. It passes stress tests including temperature cycling, highly accelerated stress testing (HAST), and surge lifetime validation - making it appropriate for protecting engine control units and battery management systems against load dump transients.
Does MAPLAD18KP170CA require special PCB layout considerations?
Yes. To achieve the specified 0.7 °C/W junction-to-case thermal resistance, MAPLAD18KP170CA must be mounted with its metal base soldered to a minimum 25 mm² copper pour or external heatsink. The recommended pad layout (Ref. RF01215) specifies 12.32 × 10.54 mm thermal pad dimensions with solder mask defined openings to maximize thermal conduction.
Can MAPLAD18KP170CA be used in bidirectional AC circuits?
No. Although MAPLAD18KP170CA is bidirectional, it is specified for DC standoff voltages only (170 V VWM). Its breakdown and clamping behavior are characterized for unipolar DC transients. For AC line protection, use AC-rated MOVs or dedicated bidirectional AC TVS arrays with RMS voltage ratings and zero-crossing specifications.
What standards does MAPLAD18KP170CA meet for lightning protection?
MAPLAD18KP170CA meets RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 for pin injection, and IEC 61000-4-5 Class 1–5 for surge immunity with 42 Ω, 12 Ω, and 2 Ω source impedances - fulfilling primary secondary lightning protection requirements in certified aircraft electronics.
MAPLAD18KP170CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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
MAPLAD18KP170CA FAQ
1.How can I place an order for MAPLAD18KP170CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP170CA 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 MAPLAD18KP170CA reliable?
The price and inventory of MAPLAD18KP170CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP170CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP170CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP170CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP170CA?
MAPLAD18KP170CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP170CA 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 MAPLAD18KP170CA?
For technical support, including MAPLAD18KP170CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP170CA requirements.
6.How does Aetrix verify that MAPLAD18KP170CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP170CA 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 MAPLAD18KP170CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP170CA?
All MAPLAD18KP170CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP170CA, 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 MAPLAD18KP170CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP170CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP170CA Tags
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ESD9B5.0ST5G
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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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
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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Diodes Incorporated
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