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Microchip Technology MAPLAD18KP70CA
- Part No.:
- MAPLAD18KP70CA
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP70CA.pdf
- Description:
- TVS DIODE 7VWM 12VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,624
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Product details
Overview
MAPLAD18KP70CA from Microsemi is a bidirectional 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, clamps at ≤113 V under 100 A peak impulse current, and features a 70 V reverse standoff voltage (VWM) with ±5% tolerance. It is qualified to AEC-Q101 and meets RTCA DO-160F Level 4 pin injection for Waveform 4.
For engineers reviewing the MAPLAD18KP70CA datasheet, MAPLAD18KP70CA pinout, MAPLAD18KP70CA application, or MAPLAD18KP70CA equivalent, this device is selected for secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, and 2 Ω source impedances), ESD/EFT immunity per IEC 61000-4-2/4-4, and load dump suppression in avionics power distribution units.
Technical Context
The MAPLAD18KP70CA employs an avalanche breakdown structure optimized for low clamping ratio (VC/V(BR) ≈ 1.39) and fast response (<5 ns). Its metal-base thermal design achieves 0.7 °C/W junction-to-case thermal resistance, enabling high-repetition-rate surge handling when mounted on FR4 with recommended pad layout.
It operates across –55 °C to +150 °C junction temperature range and supports bidirectional transient suppression without polarity constraints. Standby leakage is limited to 10 μA at 70 V, ensuring minimal impact on upstream circuit biasing in always-on avionics subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains multi-stroke lightning surges per RTCA DO-160 Section 22 |
| Reverse Standoff Voltage (VWM) | 70 V - maximum continuous DC or peak AC voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 77.8–86.0 V @ I(BR) - defines reliable avalanche initiation threshold |
| Max Clamping Voltage (VC) | 113 V @ 100 A IPP - limits downstream voltage stress during surge events |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or heatsink |
| Standby Current (ID) | 10 μA @ VWM - negligible leakage in standby power rails |
| Response Time | <5 ns - ensures sub-cycle suppression of fast transients like ESD and RFI |
Pinout & Package
MAPLAD18KP70CA uses a surface-mount PLAD package with two terminals: anode and cathode. The metal base serves as the cathode terminal for bidirectional operation; polarity is non-directional due to symmetrical construction. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), with void-free UL94V-0 epoxy body and matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry point (positive transient) | Connects to protected line; forms one side of bidirectional clamping path |
| Cathode | Surge current return path (negative transient) | Exposed metal base - must be soldered to large copper pour for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal/power lines without polarity concerns |
| 18 kW surge rating | Meets RTCA DO-160F Level 4 pin injection (Waveform 4) and Class 1–5 IEC 61000-4-5 secondary lightning |
| 0.7 °C/W RθJC | Supports >1000 surge cycles at 0.05% duty factor when thermally anchored to ≥25 cm² 2-oz copper |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and chassis modules operating at 125 °C ambient |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life restrictions per J-STD-020B |
Applications
| Aircraft Power Distribution Units | Automotive Engine Control Modules |
|---|---|
Use Scenario: Protecting 28 V DC bus inputs against lightning-induced surges during flight envelope transitions. IC Role / Device Role / Timing Role: Bidirectional TVS placed at main power entry point to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Maintains system uptime by limiting bus voltage to ≤113 V during 18 kW surges, preventing latch-up or burnout in downstream silicon. | Use Scenario: Safeguarding CAN and sensor supply lines in engine bays exposed to 12 V load dump events. IC Role / Device Role / Timing Role: Primary surge shunt on battery feed rail, coordinated with upstream fuses to clear energy within 10 ms. Use Value: Survives 1500 A forward surge (IFSM) and clamps below 120 V, preserving ISO 16750-2 compliance for 12 V systems. |
| Avionics Display Backlight Drivers | Railway Signaling Interface Boards |
Use Scenario: Shielding LED driver ICs from induced RFI and switching noise in cockpit display assemblies. IC Role / Device Role / Timing Role: Localized TVS adjacent to driver outputs to suppress fast-edge transients from PWM dimming circuits. Use Value: Prevents false triggering and gate oxide damage via <5 ns response and 10 μA leakage at 70 V standoff. | Use Scenario: Hardening Ethernet PHY and RS-485 transceivers against EFT bursts in track-side signaling cabinets. IC Role / Device Role / Timing Role: Bidirectional protection on data line pairs referenced to isolated 24 V supply rails. Use Value: Passes IEC 61000-4-4 Level 4 (4 kV) and IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA | 600 W PPP rating, 1.5 kW max; 70 V VWM, bidirectional; SMC package (smaller thermal mass) | Limited to single-stroke surges; unsuitable for RTCA DO-160 multi-stroke testing | Select SMBJ70CA only for cost-sensitive industrial I/O where 18 kW capability is unnecessary |
| SMCJ70CA | 1500 W PPP rating; same VWM and polarity; larger SMC package than PLAD but smaller than MAPLAD | Cannot meet 18 kW PPP or 0.7 °C/W RθJC; fails DO-160F Level 4 pin injection | Use SMCJ70CA for legacy designs requiring SMC footprint compatibility but not aerospace-grade surge endurance |
Compared with SMBJ70CA and SMCJ70CA, MAPLAD18KP70CA provides 30× higher peak pulse power and 3× lower thermal resistance - enabling sustained multi-stroke surge resilience required in certified avionics and high-reliability automotive ECUs.
Availability
MAPLAD18KP70CA is available at Aetrix Electronics and suitable for aircraft power distribution, automotive engine control, avionics display systems, and railway signaling interfaces requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP70CA 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 MAPLAD series belongs to Microsemi's high-power surface-mount TVS product line, engineered specifically for multi-stroke lightning protection and load dump survival in safety-critical airborne and vehicular systems.
FAQ
What is the clamping voltage of MAPLAD18KP70CA at its rated peak pulse current?
The MAPLAD18KP70CA has a maximum clamping voltage (VC) of 113 V at 100 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per Figure 3 in RF01215 Rev B and ensures downstream components remain within safe operating voltage margins during surge events. The clamping ratio (VC/V(BR)) is approximately 1.39, confirming tight regulation relative to its 77.8–86.0 V breakdown range.
Is MAPLAD18KP70CA qualified for automotive applications?
Yes, MAPLAD18KP70CA is qualified to AEC-Q101 for discrete semiconductors, validating its reliability under automotive temperature cycling, humidity, and mechanical stress requirements. It supports operation from –55 °C to +150 °C and is used in engine control modules for 12 V load dump protection. Its 18 kW surge rating exceeds ISO 7637-2 and ISO 16750-2 requirements for severe transient environments.
Does MAPLAD18KP70CA require special PCB layout considerations?
Yes, MAPLAD18KP70CA requires adherence to the recommended pad layout in RF01215 Rev B to achieve specified thermal and electrical performance. The metal base (cathode) must be soldered to a minimum 25 cm² area of 2-oz copper for effective heat dissipation. Trace inductance must be minimized - short, wide traces between protected line and TVS terminals are mandatory to preserve <5 ns response time and prevent voltage overshoot.
Can MAPLAD18KP70CA be used for both unidirectional and bidirectional protection?
No - MAPLAD18KP70CA is strictly bidirectional, indicated by the "CA" suffix. It provides symmetrical clamping for positive and negative transients without polarity dependence. For unidirectional use, the corresponding part is MAPLAD18KP70A. Using MAPLAD18KP70CA in place of a unidirectional device introduces no functional risk but may incur unnecessary cost and board space in DC-only applications.
What standards does MAPLAD18KP70CA meet for lightning protection?
MAPLAD18KP70CA meets RTCA DO-160F Section 22 for multi-stroke lightning (Level 4 pin injection with Waveform 4), and IEC 61000-4-5 for secondary lightning protection across Class 1–5 at 42 Ω source impedance, Class 1–4 at 12 Ω, and Class 2–3 at 2 Ω. These certifications are explicitly listed in the RF01215 datasheet for the MPLAD18KP70CA variant.
MAPLAD18KP70CA 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 1500A (1.5kA)
- 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
MAPLAD18KP70CA FAQ
1.How can I place an order for MAPLAD18KP70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP70CA 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 MAPLAD18KP70CA reliable?
The price and inventory of MAPLAD18KP70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP70CA is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP70CA?
MAPLAD18KP70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP70CA 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 MAPLAD18KP70CA?
For technical support, including MAPLAD18KP70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP70CA requirements.
6.How does Aetrix verify that MAPLAD18KP70CA is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP70CA 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 MAPLAD18KP70CA meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP70CA?
All MAPLAD18KP70CA units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP70CA, 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 MAPLAD18KP70CA part is unused and in its original packaging.
Return procedure for MAPLAD18KP70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP70CA Tags
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