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Microchip Technology MAPLAD18KP12A
- Part No.:
- MAPLAD18KP12A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP12A.pdf
- Description:
- TVS DIODE 12VWM 19.9VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,587
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Product details
Overview
MAPLAD18KP12A from Microsemi is a unidirectional 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, features a 12 V reverse standoff voltage (VWM), clamps to ≤19.9 V at 905 A peak impulse current, and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD18KP12A datasheet, MAPLAD18KP12A pinout, MAPLAD18KP12A application, or MAPLAD18KP12A equivalent, key selection criteria include its 0.7 °C/W junction-to-case thermal resistance, metal-base cathode configuration, IEC 61000-4-5 Class 4 secondary lightning protection with 12 Ω source impedance, and compliance with AEC-Q101 reliability testing.
Technical Context
The MAPLAD18KP12A employs an avalanche diode structure optimized for rapid response (<100 ps turn-on) and low clamping ratio (VC/VWM ≈ 1.66). Its thermally enhanced metal-base package enables direct heat sinking, supporting sustained operation under repetitive transients at ≤0.05% duty cycle when mounted per recommended FR4 pad layout.
It is rated for junction temperatures from –55 °C to +150 °C, exhibits a +11 mV/°C breakdown voltage temperature coefficient, and achieves 3σ lot norm screening on standby current (ID ≤ 10 μA @ 12 V), ensuring stable leakage performance across temperature and lot variance.
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) | 12 V - matches nominal 12 V DC bus systems while allowing margin before clamping |
| Clamping Voltage (VC) | ≤19.9 V @ 905 A - limits downstream IC stress to safe levels during load dump events |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Standby Current (ID) | ≤10 μA @ VWM - ensures negligible power loss in always-on vehicle electronics |
| Breakdown Voltage (V(BR)) | 13.3–14.7 V @ I(BR) - guarantees reliable triggering above system operating voltage |
| Temperature Coefficient (αV(BR)) | +11 mV/°C - allows predictable voltage shift over –55 °C to +150 °C operating range |
Pinout & Package
MAPLAD18KP12A uses a surface-mount plastic package with metal base (cathode) and two solder terminals. The cathode is the exposed metal underside of the device body; the anode is the top-side metallized pad. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), with recommended FR4 mounting pad per RF01215 Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side pad) | Transient current entry point for unidirectional clamping | Connected to protected line (e.g., 12 V rail); conducts surge current toward cathode |
| Cathode (metal base) | Current return path and thermal interface | Must be soldered to large copper pour or heatsink; serves as primary thermal conduction path |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer fabrication | Full lot traceability and AEC-Q101 qualification for automotive-grade deployment |
| Low-profile SMT construction | 5.08 mm height enables integration into space-constrained avionics enclosures |
| RTCA DO-160F Waveform 4 compliance | Level 4 pin injection protection (6.4/69 μs) verified for aircraft wiring harness interfaces |
| IEC 61000-4-5 secondary lightning protection | Validated for Class 4 with 12 Ω source impedance - critical for engine control unit inputs |
| MIL-PRF-19500 upscreening option | Available with military-grade screening (e.g., MXL level) for extended mission-critical life |
Applications
| Aircraft Power Distribution Units | Automotive Engine Control Modules |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses against induced lightning transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary transient suppression element placed at bus entry point before DC-DC converters. Use Value: Withstands ≥100 multi-stroke lightning events at 18 kW without degradation, validated per waveform 4 and 5A test profiles. | Use Scenario: Safeguarding ECU microcontroller supply rails during 12 V battery load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge energy to ground via chassis-connected cathode. Use Value: Clamps 905 A peak current to ≤19.9 V within 100 ps, preventing latch-up or damage to 3.3 V/5 V logic circuitry. |
| Industrial Motor Drive Gate Drivers | Railway Signaling Interface Boards |
Use Scenario: Shielding isolated gate driver inputs from switching-induced RFI and inductive kickback. IC Role / Device Role / Timing Role: Fast-response clamp on high-side gate drive lines subject to dV/dt > 50 V/ns. Use Value: Sub-100 ps turn-on time and 0.7 °C/W thermal resistance maintain signal integrity and prevent thermal runaway during repeated PWM faults. | Use Scenario: Providing secondary surge immunity on 72 V DC signaling lines in EN 50121-compliant railway electronics. IC Role / Device Role / Timing Role: Standoff-rated TVS on field-side I/O channels interfacing with trackside sensors. Use Value: Meets IEC 61000-4-5 Class 4 (12 Ω source) and supports 3σ ID screening for long-term leakage stability in humid environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | 600 W PPP rating, 3.5x lower surge capacity; TO-263 package with higher RθJA (40 °C/W) | Limited to single-stroke industrial surges; not qualified for RTCA DO-160 or AEC-Q101 | Select only for cost-sensitive non-aviation/non-automotive designs with <200 A IPP requirement |
| SMCJ12A | 1500 W PPP rating, same VWM but 83% lower clamping energy handling; SMC package with RθJC = 1.5 °C/W | Not validated for multi-stroke lightning or pin injection waveforms; lacks MIL-PRF-19500 upscreening path | Use where board-level space permits larger footprint and thermal budget allows higher junction rise |
Compared with SMBJ12A and SMCJ12A, the MAPLAD18KP12A provides 30× higher peak pulse power, 2.1× lower junction-to-case thermal resistance, and formal certification for aviation lightning standards - making it the sole choice for DO-160-compliant airborne systems requiring multi-event survivability.
Availability
MAPLAD18KP12A is available at Aetrix Electronics and suitable for aircraft power distribution units, automotive engine control modules, and industrial motor drive gate drivers requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP12A 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) designs high-reliability semiconductor solutions for aerospace, defense, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and robust discrete components.
The MAPLAD18KP12A belongs to Microsemi's PLAD family of high-power surface-mount TVS diodes, engineered specifically for multi-stroke lightning protection and automotive load dump suppression in safety-critical platforms.
FAQ
What is the clamping voltage of the MAPLAD18KP12A at its rated peak pulse current?
The MAPLAD18KP12A has a maximum clamping voltage (VC) of 19.9 V at 905 A peak impulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per RF01215 Rev B and ensures protected circuits remain below 20 V during worst-case transients, preserving compatibility with standard 24 V tolerant interfaces.
Does the MAPLAD18KP12A meet AEC-Q101 qualification requirements?
Yes, the MAPLAD18KP12A is tested in accordance with AEC-Q101 requirements for discrete semiconductors. It undergoes stress testing including HTGB, HTRB, and temperature cycling, and is marked "AEC-Q101" in Microsemi documentation (RF01215 Rev B, page 1). This validates its suitability for automotive under-hood and powertrain applications.
How is thermal management implemented for the MAPLAD18KP12A in high-duty-cycle applications?
The MAPLAD18KP12A relies on its metal-base cathode for thermal conduction. To manage heat, the cathode must be soldered to a minimum 10 cm² copper area on FR4 or directly to an external heatsink. Its 0.7 °C/W RθJC enables junction temperature rise of only 630 °C per kW - so at full 18 kW pulse, proper mounting keeps ΔTJC within safe limits for sub-second events.
Is the MAPLAD18KP12A RoHS compliant, and what marking indicates this?
Yes, the MAPLAD18KP12A is RoHS compliant. Per RF01215 Rev B, RoHS-compliant versions use "e3" plating (annealed matte-tin) and are marked with the "e3" suffix in the full part number. The base part number MAPLAD18KP12A may be either RoHS or non-RoHS depending on ordering code; confirm compliance via the "e3" designation on the device body or orderable variant.
Can the MAPLAD18KP12A be used for bidirectional surge protection?
No, the MAPLAD18KP12A is unidirectional only. Bidirectional variants carry the "CA" suffix (e.g., MAPLAD18KP12CA). Using the unidirectional MAPLAD18KP12A on AC or bipolar signal lines would result in forward conduction during negative transients, potentially causing failure. Select MAPLAD18KP12CA for bidirectional applications.
MAPLAD18KP12A 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 905A
- 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
MAPLAD18KP12A FAQ
1.How can I place an order for MAPLAD18KP12A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP12A 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 MAPLAD18KP12A reliable?
The price and inventory of MAPLAD18KP12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP12A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP12A?
MAPLAD18KP12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP12A 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 MAPLAD18KP12A?
For technical support, including MAPLAD18KP12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP12A requirements.
6.How does Aetrix verify that MAPLAD18KP12A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP12A 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 MAPLAD18KP12A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP12A?
All MAPLAD18KP12A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP12A, 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 MAPLAD18KP12A part is unused and in its original packaging.
Return procedure for MAPLAD18KP12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP12A Tags
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