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Microchip Technology MAPLAD18KP17A
- Part No.:
- MAPLAD18KP17A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP17A.pdf
- Description:
- TVS DIODE 17VWM 27.6VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,893
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Product details
Overview
MAPLAD18KP17A 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 ≤27.6 V under 653 A peak impulse current, and features a 17 V reverse standoff voltage (VWM) with 18.9–20.9 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for aircraft avionics.
For engineers reviewing the MAPLAD18KP17A datasheet, MAPLAD18KP17A pinout, MAPLAD18KP17A application, or MAPLAD18KP17A equivalent, key selection criteria include its 17 V working voltage, low 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, IEC 61000-4-5 Class 4 secondary lightning protection (42 Ω source), and verified performance under multi-stroke lightning per DO-160 Section 22.
Technical Context
The MAPLAD18KP17A employs an avalanche diode structure optimized for fast response (<5 ns clamping rise time) and high cumulative energy handling. Its metal-base package enables direct thermal coupling to heatsinks, supporting sustained operation with RθJC = 0.7 °C/W and RθJA = 50 °C/W on FR4.
It is rated for bidirectional variants (suffix CA) but MAPLAD18KP17A is unidirectional, with cathode on the metal base. Standby leakage is ≤10 μA at 17 V, and forward clamping remains ≤2.0 V at 500 A - critical for protecting downstream MOSFET gates during load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous DC or peak AC voltage the device blocks without conduction |
| V(BR) min/max | 18.9–20.9 V - guaranteed avalanche onset range at 1 mA, ensuring predictable turn-on margin above VWM |
| VC @ IPP | 27.6 V max at 653 A - clamping voltage limiting protected circuit stress during worst-case 10/1000 μs transients |
| PPP | 18,000 W @ 10/1000 μs - peak power dissipation capability enabling single-device protection against lightning & load dump |
| RθJC | 0.7 °C/W - low thermal resistance enabling efficient heat transfer to external heatsink or copper plane |
| ID @ VWM | ≤10 μA - ultra-low leakage preserving system standby power integrity in battery-backed avionics |
| Polarity | Unidirectional - cathode on metal base; requires correct PCB orientation for proper circuit protection |
Pinout & Package
MAPLAD18KP17A uses a surface-mount, metal-base PLAD package (0.470" × 0.230" × 0.100", approx. 11.9 × 5.8 × 2.4 mm) with cathode connected to the exposed metal base for thermal and electrical reference. The anode is accessible via the top-side metallized pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary thermal path and high-current return node; must be soldered to large copper pour or heatsink |
| Top Metallized Pad | Anode | Input connection point for transient energy; routed to protected line (e.g., 12/28 V bus) |
Key Features
| Feature | Design Value |
|---|---|
| DO-160F Waveform 4 Level 4 compliance | Validated protection against 6.4/69 μs pin-injected transients up to 100 V, essential for aircraft flight control interfaces |
| AEC-Q101 qualification | Stress-tested across temperature cycling, HTRB, and ESD to ensure reliability in automotive 12 V/24 V load dump environments |
| IEC 61000-4-5 Class 4 (42 Ω) | Withstands 4 kV surge with 42 Ω source impedance - matches secondary protection requirements in industrial PLC I/O modules |
| RoHS-compliant e3 plating | Matte-tin termination compatible with lead-free reflow profiles and IPC/JEDEC J-STD-020B Level 1 moisture sensitivity |
| Low-profile SMT footprint | Enables high-density placement near connectors or power entry points without height interference in stacked avionics enclosures |
Applications
| Aircraft Avionics Power Input | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of ARINC 429 data lines and 28 V DC power inputs against lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient shunt device placed directly at connector entry, clamping transients before they reach LDOs and FPGAs. Use Value: Enables single-device compliance with multi-stroke lightning testing (≥10 shots at 18 kW), reducing BOM count vs. multi-stage designs. | Use Scenario: Load dump suppression on 12 V battery-fed microcontroller power rails during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS absorbing >400 A pulses within <5 ns, preventing latch-up or gate oxide damage in MCU power management ICs. Use Value: Clamps to 27.6 V while maintaining <10 μA leakage - preserves low-power sleep mode integrity in ISO 16750-2 compliant ECUs. |
| Industrial Motor Drive DC Bus | Railway Signaling Power Supply |
Use Scenario: Secondary surge protection on 300–600 V DC bus inputs subjected to IEC 61000-4-5 indirect lightning coupling. IC Role / Device Role / Timing Role: Parallel-connected TVS array element providing localized clamping at converter input stage. Use Value: 0.7 °C/W RθJC allows direct mounting to aluminum heatsink, sustaining repeated 18 kW pulses without thermal runaway. | Use Scenario: Protection of 110 V DC signaling power supplies in EN 50121-3-2 compliant railway control cabinets. IC Role / Device Role / Timing Role: Unidirectional shunt device safeguarding relay driver outputs and optocoupler bias rails. Use Value: Validated for 2 Ω and 12 Ω source impedances per IEC 61000-4-5 Class 2–4, covering both short-cable and long-line surge coupling scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17A | 600 W PPP rating, 5.0 mm × 3.5 mm SMB package, RθJC ≈ 25 °C/W | Limited to single-stroke 1 kV surges; unsuitable for DO-160 multi-stroke or automotive load dump | Select only for cost-sensitive consumer-grade 12 V systems with <100 A surge exposure. |
| SMCJ17A | 1500 W PPP, SMC package, 7.1 mm × 6.2 mm footprint, RθJC ≈ 12 °C/W | Meets IEC 61000-4-5 Class 3 but not DO-160F Level 4; no AEC-Q101 qualification | Acceptable for industrial controls where 18 kW capability is unnecessary and space permits larger SMC outline. |
Compared with SMBJ17A and SMCJ17A, MAPLAD18KP17A provides 30× higher peak power, 18× lower thermal resistance, and certified compliance with aviation and automotive standards - making it irreplaceable for mission-critical, high-reliability surge protection where single-device robustness is mandatory.
Availability
MAPLAD18KP17A is available at Aetrix Electronics and suitable for aircraft avionics integration, automotive ECU design, and industrial motor drive protection requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP17A 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, mixed-signal, and radiation-hardened solutions for aerospace, defense, and industrial markets.
The MAPLAD18KP17A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for single-device compliance with RTCA DO-160, AEC-Q101, and IEC 61000-4-5 in space-constrained, thermally demanding environments.
FAQ
What is the maximum clamping voltage of MAPLAD18KP17A under peak surge conditions?
The MAPLAD18KP17A has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current (IPP) of 653 A under 10/1000 μs waveform conditions. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during worst-case transients - critical for ensuring downstream components like 30 V-rated MOSFETs remain within safe operating area.
Is MAPLAD18KP17A suitable for bidirectional signal line protection?
No, MAPLAD18KP17A is unidirectional and intended for DC power rail protection only. Its cathode is on the metal base, and it conducts only when the anode exceeds cathode potential by ≥18.9 V. For bidirectional protection (e.g., RS-485, CAN), the MAPLAD18KP17CA variant must be used - it features symmetrical breakdown in both directions and identical power ratings.
Does MAPLAD18KP17A require a heatsink for reliable operation?
While MAPLAD18KP17A can survive single 18 kW pulses without external heatsinking, sustained or repetitive surges demand thermal management. Its 0.7 °C/W junction-to-case resistance requires direct soldering to ≥25 cm² of 2 oz copper or attachment to an aluminum heatsink to maintain TJ < 150 °C. Derating curves in Figure 3 show >50% PPP loss above 100 °C case temperature.
What packaging options are available for MAPLAD18KP17A?
MAPLAD18KP17A is supplied in bulk or tape-and-reel format. Tape-and-reel ordering requires adding the "TR" suffix (e.g., MAPLAD18KP17ATR) and conforms to EIA-481-B standards. Reel quantities are configurable per customer requirement; standard reels hold 500 units. RoHS-compliant e3 plating is standard; non-RoHS versions are available upon request with blank suffix.
How does MAPLAD18KP17A meet RTCA DO-160F Section 22 lightning requirements?
MAPLAD18KP17A meets DO-160F Section 22 through validated multi-stroke testing: it withstands ≥10 consecutive 18 kW pulses at 10/1000 μs without parameter shift or catastrophic failure. Its low RθJC and void-free epoxy body prevent thermal accumulation between strokes - a key differentiator versus lower-power TVS devices that degrade after 2–3 strikes.
MAPLAD18KP17A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 653A
- 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
MAPLAD18KP17A FAQ
1.How can I place an order for MAPLAD18KP17A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP17A 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 MAPLAD18KP17A reliable?
The price and inventory of MAPLAD18KP17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP17A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP17A?
MAPLAD18KP17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP17A 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 MAPLAD18KP17A?
For technical support, including MAPLAD18KP17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP17A requirements.
6.How does Aetrix verify that MAPLAD18KP17A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP17A 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 MAPLAD18KP17A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP17A?
All MAPLAD18KP17A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP17A, 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 MAPLAD18KP17A part is unused and in its original packaging.
Return procedure for MAPLAD18KP17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP17A Tags
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