My Inquiry
My Account
Microchip Technology MAPLAD18KP45CA
- Part No.:
- MAPLAD18KP45CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP45CA.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,284
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAPLAD18KP45CA 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, clamps transients to ≤72.7 V at 248 A, and features a 45 V reverse standoff voltage (VWM) with ±5% breakdown tolerance (50.0–55.3 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 MAPLAD18KP45CA datasheet, MAPLAD18KP45CA pinout, MAPLAD18KP45CA application, or MAPLAD18KP45CA equivalent, this device is selected for high-reliability DC bus, avionics power input, and automotive load-dump protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant packaging, and multi-stroke lightning compliance are critical design constraints.
Technical Context
The MAPLAD18KP45CA employs an avalanche diode structure optimized for fast response (<5 ns clamping time) and high cumulative energy handling. Its bidirectional construction enables symmetrical clamping for AC-coupled or floating signal/power lines, and its metal-base thermal path minimizes junction-to-case thermal resistance to 0.7 °C/W - enabling effective heat dissipation on FR4 PCBs with recommended pad layout.
It is rated for operation from –55 °C to +150 °C, supports steady-state power dissipation of 2.5 W at 25 °C ambient, and undergoes 100% surge testing per IEC 61000-4-2/4-4/4-5 and RTCA DO-160F. The device complies with IPC/JEDEC J-STD-020B moisture sensitivity Level 1 and is available in RoHS-compliant (e3) matte-tin plating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft lightning-induced surges without failure |
| Reverse Standoff Voltage (VWM) | 45 V - maximum continuous DC or RMS AC voltage before conduction begins |
| Clamping Voltage (VC) | 72.7 V @ 248 A - limits downstream circuit voltage during worst-case surge |
| Breakdown Voltage (V(BR)) | 50.0–55.3 V @ I(BR) - defines precise avalanche onset threshold for bidirectional symmetry |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables direct mounting to heatsink or copper pour for thermal management |
| Junction Temperature Range | –55 °C to +150 °C - supports operation in engine bay, avionics bays, and industrial enclosures |
| Moisture Sensitivity Level | Level 1 (J-STD-020B) - no dry pack or baking required prior to reflow |
Pinout & Package
MAPLAD18KP45CA uses a surface-mount, low-profile plastic package with metal baseplate for thermal conduction. The cathode is the metal base (bottom side); polarity is marked on top surface per Microsemi standard marking convention. Package dimensions: 12.32 × 10.54 × 3.68 mm (L × W × H), with recommended pad layout per RF01215 Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Surface Pad) | Transient current entry point (bidirectional) | Accepts positive or negative surge relative to cathode; symmetric conduction path |
| Cathode (Metal Base) | Transient current return path & thermal interface | Electrically connected to PCB ground plane and serves as primary heat sink interface |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or floating DC buses without polarity concerns |
| 0.7 °C/W RθJC | Reduces thermal derating impact - maintains full 18 kW rating with minimal heatsinking |
| AEC-Q101 qualification | Validates reliability for automotive under-hood and powertrain applications |
| RTCA DO-160F Waveform 4 Level 4 compliance | Meets aviation lightning pin-injection immunity requirement (6.4/69 μs, 25 °C) |
| IEC 61000-4-5 Class 1–5 support (42 Ω source) | Provides certified secondary lightning protection for avionics and industrial control cabinets |
Applications
| Avionics Power Input Protection | Automotive Load-Dump Suppression |
|---|---|
Use Scenario: Protecting 28 V DC power inputs in flight control computers and navigation units against lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of DC-DC converters and EMI filters to limit surge voltage to <73 V. Use Value: Prevents latch-up or destruction of downstream silicon by clamping 18 kW surges within 5 ns while maintaining system-level DO-160F certification. | Use Scenario: Safeguarding infotainment ECUs and ADAS domain controllers during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary overvoltage clamp across battery rail, absorbing up to 18 kW energy without degradation over multiple strokes. Use Value: Eliminates need for parallel TVS arrays - single MAPLAD18KP45CA replaces multi-device solutions while meeting AEC-Q101 lifetime requirements. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Protecting 48 V DC bus in variable-frequency drives from switching transients and induced RFI during IGBT commutation. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly on bus copper pour to shunt fast-rising edge transients (<100 ps rise time) before reaching gate drivers. Use Value: Reduces EMI filter size by limiting common-mode voltage spikes to <73 V, improving EMC test margin by ≥6 dB. | Use Scenario: Securing 72 V signaling interfaces in European railway signaling cabinets against EFT bursts and lightning coupling per EN 50121-3-2. IC Role / Device Role / Timing Role: Secondary protection device installed after primary gas discharge tube, clamping residual surges to safe levels for optocoupler inputs. Use Value: Enables compact, maintenance-free protection architecture compliant with SIL-2 functional safety requirements via verified multi-stroke endurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA | 600 W PPP rating, 5.0 mm × 3.5 mm SMB package, RθJC ≈ 25 °C/W | Not suitable for DO-160F Level 4 or multi-stroke lightning; limited to consumer/industrial grade | Select only for cost-sensitive, non-certified 45 V DC applications with low surge repetition rate |
| SMCJ45CA | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJC ≈ 12 °C/W | Lacks AEC-Q101 qualification and DO-160F validation; insufficient for aviation or automotive safety-critical use | Use where 1.5 kW peak surge capacity suffices and formal certification is not required |
Compared with SMBJ45CA and SMCJ45CA, MAPLAD18KP45CA provides 30× and 12× higher peak pulse power respectively, validated multi-stroke lightning performance, and certified AEC-Q101 reliability - making it the sole option for certified avionics, automotive safety systems, and industrial infrastructure requiring >10 kA surge immunity.
Availability
MAPLAD18KP45CA is available at Aetrix Electronics and suitable for avionics power input protection, automotive load-dump suppression, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and certified surge performance.
Supply support for MAPLAD18KP45CA 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 ICs for aerospace, defense, and industrial markets.
The MAPLAD18KP45CA belongs to Microsemi's high-power PLAD family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where thermal robustness, multi-stroke endurance, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP45CA at its rated peak pulse current?
The MAPLAD18KP45CA has a maximum clamping voltage (VC) of 72.7 V at 248 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures downstream components see voltage limited to this level during worst-case surge events. The MAPLAD18KP45CA achieves this with sub-5 ns response time, critical for protecting sensitive gate drivers and microcontrollers.
Is MAPLAD18KP45CA qualified for automotive applications?
Yes, MAPLAD18KP45CA is fully qualified to AEC-Q101 for stress testing including HTGB, HTRB, and temperature cycling. It is designed for automotive load-dump protection in 24 V and 48 V systems, supporting ISO 7637-2 Pulse 5a compliance when used with appropriate PCB layout and thermal management. The MAPLAD18KP45CA also meets moisture sensitivity Level 1, eliminating bake requirements prior to reflow soldering.
Does MAPLAD18KP45CA meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP45CA is validated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 up to 130 V variants. For MAPLAD18KP45CA specifically, it satisfies Level 4 pin injection immunity at 25 °C and supports full multi-stroke capability per DO-160F. This makes MAPLAD18KP45CA suitable for primary and secondary lightning protection in certified avionics equipment.
What is the thermal resistance and how does it affect PCB layout for MAPLAD18KP45CA?
MAPLAD18KP45CA has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W, achieved via its metal-base package. This requires direct thermal connection of the cathode (baseplate) to a large copper pour or heatsink. Per RF01215 Rev B, the recommended pad layout uses ≥250 mm² of 2-oz copper connected to internal ground planes via ≥6 thermal vias. Without this, MAPLAD18KP45CA derates significantly - e.g., at 100 °C case temperature, steady-state power drops to 71 W but peak pulse capability remains intact if duty cycle is ≤0.05%.
How does MAPLAD18KP45CA differ from unidirectional variants like MAPLAD18KP45A?
MAPLAD18KP45CA is bidirectional, providing symmetrical clamping for both polarities - essential for AC-coupled lines, floating supplies, or differential buses. MAPLAD18KP45A is unidirectional, with cathode on the base and anode on the top pad, suited only for DC rails referenced to ground. Both share identical PPP (18 kW), VWM (45 V), and thermal specs, but MAPLAD18KP45CA's bidirectional behavior means it conducts during negative surges, whereas MAPLAD18KP45A would block them - making MAPLAD18KP45CA the correct choice for non-ground-referenced protection schemes.
MAPLAD18KP45CA 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 248A
- 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
MAPLAD18KP45CA FAQ
1.How can I place an order for MAPLAD18KP45CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP45CA 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 MAPLAD18KP45CA reliable?
The price and inventory of MAPLAD18KP45CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP45CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP45CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP45CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP45CA?
MAPLAD18KP45CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP45CA 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 MAPLAD18KP45CA?
For technical support, including MAPLAD18KP45CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP45CA requirements.
6.How does Aetrix verify that MAPLAD18KP45CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP45CA 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 MAPLAD18KP45CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP45CA?
All MAPLAD18KP45CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP45CA, 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 MAPLAD18KP45CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP45CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP45CA 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…
