My Inquiry
My Account
Microchip Technology MAPLAD18KP8.5CA
- Part No.:
- MAPLAD18KP8.5CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP8.5CA.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,383
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAPLAD18KP8.5CA from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 8.5 V reverse standoff voltage (VWM), clamps to ≤14.4 V at 1250 A IPP, and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the MAPLAD18KP8.5CA datasheet, MAPLAD18KP8.5CA pinout, MAPLAD18KP8.5CA application, or MAPLAD18KP8.5CA equivalent, this device is selected for RTCA DO-160 Section 22 multi-stroke lightning compliance, IEC 61000-4-5 secondary lightning protection (42 Ω, 12 Ω, and 2 Ω source impedances), and pin-injection immunity per Waveform 4 and 5A.
Technical Context
The MAPLAD18KP8.5CA employs an avalanche diode structure optimized for low clamping ratio (VC/VWM ≈ 1.69) and sub-5 ns response time. Its metal-base cathode construction enables direct thermal coupling to PCB copper or heatsinks, achieving RθJC = 0.7 °C/W and supporting high-repetition transients with ≤0.05% duty factor.
It meets AEC-Q101 stress testing requirements and supports MIL-PRF-19500 upscreening options (M/MA/MXL levels). The device is rated for IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT (4 kV), and RTCA/DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4) pin injection events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 8.5 V - maximum continuous operating voltage before clamping initiates |
| Clamping Voltage (VC) | ≤14.4 V @ 1250 A IPP - limits downstream IC voltage stress during surge |
| Breakdown Voltage (V(BR)) | 9.44–10.4 V @ I(BR) - ensures reliable avalanche conduction onset |
| Junction-to-Ambient RθJA | 50 °C/W (on FR4 w/ recommended pad) - defines thermal derating for sustained operation |
| Thermal Resistance RθJC | 0.7 °C/W - enables efficient heat transfer to external heatsink or copper plane |
| Temperature Range | –55 °C to +150 °C - qualified for under-hood automotive and avionics environments |
Pinout & Package
MAPLAD18KP8.5CA uses a surface-mount PLAD package with metal base cathode configuration. The cathode terminal 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), weight ≈ 1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and return node; must be soldered to large copper pour or heatsink |
| Top Metallized Pad | Anode | Signal input node; connects to protected line (e.g., power rail or data line) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC lines and differential signals against ± polarity surges without polarity dependency |
| Low-profile SMT package | Enables high-density PCB layouts while maintaining 18 kW surge capability - no through-hole mounting required |
| RTCA DO-160F Waveform 4 & 5A compliance | Validated for Level 4 pin injection (6.4/69 μs and 40/120 μs) - critical for flight-critical avionics interfaces |
| IEC 61000-4-5 secondary lightning protection | Qualified at Class 1–5 (42 Ω), Class 1–4 (12 Ω), and Class 2–3 (2 Ω) - covers full range of system-level surge test configurations |
| AEC-Q101 qualification | Ensures reliability for automotive electronics including engine control, ADAS, and battery management systems |
Applications
| Aerospace Avionics Power Bus | Automotive Load Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC power distribution networks in commercial aircraft against multi-stroke lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary surge suppression element placed at power entry point upstream of DC-DC converters and bus monitors. Use Value: Withstands ≥1000A surges at 10/1000 μs while limiting bus voltage to ≤14.4 V - prevents latch-up or burnout in downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding vehicle infotainment and ADAS ECUs during alternator load dump events (ISO 7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Bidirectional TVS shunting transient energy directly to chassis ground via metal base. Use Value: Clamps 12 V system transients to <14.4 V within <5 ns - maintains functional safety integrity without requiring series impedance or additional filtering. |
| Industrial Motor Drive Control Inputs | Railway Signaling Interface |
Use Scenario: Shielding isolated analog inputs (e.g., current sense, temperature feedback) on variable-frequency drives from switching-induced RFI and EFT. IC Role / Device Role / Timing Role: Low-capacitance transient clamp placed adjacent to isolation barrier inputs. Use Value: Provides IEC 61000-4-4 EFT immunity (4 kV) and IEC 61000-4-2 ESD (±30 kV) without signal distortion - preserves measurement accuracy. |
Use Scenario: Protecting 72 V DC signaling lines in train control systems against induced surges from nearby traction currents and lightning coupling. IC Role / Device Role / Timing Role: Secondary protection device installed at trackside interface module entry points. Use Value: Meets EN 50121-3-2 Class 3/4 surge requirements with 42 Ω source impedance - ensures fail-safe operation in safety-critical signaling paths. |
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 SMAJ8.5CA | Lower PPP rating (400 W), smaller SMC package, higher RθJA (65 °C/W), unqualified for DO-160 or AEC-Q101 | Suitable only for consumer-grade or non-safety-critical industrial use; not validated for aviation or automotive environments | Select MAPLAD18KP8.5CA when multi-stroke lightning, RTCA DO-160, or AEC-Q101 compliance is mandatory. |
| Vishay SM8S8.5A | Unidirectional only, 6600 W PPP, TO-277 package, no metal-base thermal path, not DO-160 tested | Limited to DC-biased circuits; lacks bidirectional capability and aviation-grade surge validation | Choose MAPLAD18KP8.5CA for bidirectional AC/DC protection and certified multi-stroke performance in harsh environments. |
Compared with SMAJ8.5CA and SM8S8.5A, MAPLAD18KP8.5CA uniquely combines 18 kW surge capacity, bidirectional operation, metal-base thermal efficiency, and formal RTCA DO-160F and AEC-Q101 qualification - making it the only option for certified aerospace and automotive power-line protection.
Availability
MAPLAD18KP8.5CA is available at Aetrix Electronics and suitable for aerospace avionics, automotive power systems, and industrial motor drive designs requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.
Supply support for MAPLAD18KP8.5CA 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) 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 MAPLAD18KP8.5CA belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning protection and mission-critical surge immunity in avionics, automotive, and rail transportation systems.
FAQ
What is the clamping voltage of MAPLAD18KP8.5CA at its rated peak pulse current?
The MAPLAD18KP8.5CA has a maximum clamping voltage (VC) of 14.4 V at 1250 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures downstream circuitry remains below safe overvoltage thresholds during surge events. The clamping performance is validated across the full operating temperature range.
Is MAPLAD18KP8.5CA qualified for automotive applications?
Yes, MAPLAD18KP8.5CA is fully qualified to AEC-Q101 standards for stress testing, including high-temperature operating life, temperature cycling, and surge robustness. It is widely deployed in automotive powertrain and ADAS modules where load dump and ISO 7637-2 compliance are required. Its bidirectional architecture supports both 12 V and 24 V system protection.
Does MAPLAD18KP8.5CA meet RTCA DO-160 Section 22 requirements?
Yes, MAPLAD18KP8.5CA is explicitly rated for RTCA DO-160 Section 22 multi-stroke lightning testing. The datasheet confirms Level 4 pin injection immunity for Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs), and full compliance with the 10/1000 μs lightning surge waveform at 18 kW. These qualifications are documented in RF01215 Rev B.
How is thermal management handled in MAPLAD18KP8.5CA?
MAPLAD18KP8.5CA uses a metal-base PLAD package where the cathode serves as the primary thermal path. With RθJC = 0.7 °C/W, heat is efficiently conducted from the die to the PCB copper pour or external heatsink. The recommended pad layout (per datasheet page 7) maximizes thermal dissipation and supports sustained surge repetition rates up to 0.05% duty cycle.
What is the difference between MAPLAD18KP8.5A and MAPLAD18KP8.5CA?
The "CA" suffix in MAPLAD18KP8.5CA denotes bidirectional construction, whereas MAPLAD18KP8.5A is unidirectional. Both share identical 8.5 V VWM, 14.4 V VC, and 18 kW PPP ratings, but MAPLAD18KP8.5CA protects against surges of either polarity - essential for AC-coupled lines, differential buses, or systems where voltage polarity reversal may occur during fault conditions.
MAPLAD18KP8.5CA 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 1250A (1.25kA)
- 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
MAPLAD18KP8.5CA FAQ
1.How can I place an order for MAPLAD18KP8.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP8.5CA 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 MAPLAD18KP8.5CA reliable?
The price and inventory of MAPLAD18KP8.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP8.5CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP8.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP8.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP8.5CA?
MAPLAD18KP8.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP8.5CA 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 MAPLAD18KP8.5CA?
For technical support, including MAPLAD18KP8.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP8.5CA requirements.
6.How does Aetrix verify that MAPLAD18KP8.5CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP8.5CA 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 MAPLAD18KP8.5CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP8.5CA?
All MAPLAD18KP8.5CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP8.5CA, 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 MAPLAD18KP8.5CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP8.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP8.5CA Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
