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Microchip Technology MAPLAD18KP26CAE3
- Part No.:
- MAPLAD18KP26CAE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP26CAE3.pdf
- Description:
- TVS DIODE 26VWM 42.1VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
MAPLAD18KP26CAE3 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, features a 26 V reverse standoff voltage (VWM), clamps to ≤42.1 V at 428 A peak impulse current (IPP), and meets RTCA DO-160 Section 22 multi-stroke lightning requirements for aircraft electronics.
For engineers reviewing the MAPLAD18KP26CAE3 datasheet, MAPLAD18KP26CAE3 pinout, MAPLAD18KP26CAE3 application, or MAPLAD18KP26CAE3 equivalent, key selection criteria include its bidirectional polarity, 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, IEC 61000-4-5 Class 4 secondary lightning protection with 42 Ω source impedance, and qualification per AEC-Q101.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuitry, activating when transient voltage exceeds its 26 V working standoff level. Its silicon avalanche structure provides sub-5 ns response time and low clamping ratio (VC/VWM ≈ 1.62), enabling effective suppression of load dump, ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and induced RFI transients.
Designed for high-reliability environments, MAPLAD18KP26CAE3 supports thermal management via direct metal-base mounting on heatsinks, achieving 0.7 °C/W RθJC and 50 °C/W RθJA on FR4 PCBs. It is rated for -55°C to +150°C operation and qualified to AEC-Q101, with optional MIL-PRF-19500 upscreening available.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous DC or RMS operating voltage before clamping begins |
| V(BR) min/max | 28.9–31.9 V - Breakdown voltage range at test current, defining turn-on threshold consistency |
| VC @ IPP | ≤42.1 V at 428 A - Clamping voltage under 10/1000 μs surge, limiting downstream voltage stress |
| PPP | 18,000 W - Peak pulse power handling capability, enabling single-device protection against severe lightning surges |
| RθJC | 0.7 °C/W - Junction-to-case thermal resistance, supporting high-power dissipation when mounted to heatsink |
| Standby ID | ≤10 μA @ 26 V - Ultra-low leakage ensuring minimal impact on system bias and power budget |
| Polarity | Bidirectional - Symmetric clamping for AC-coupled or floating signal/power lines |
Pinout & Package
MAPLAD18KP26CAE3 uses a surface-mount PLAD package with metal base cathode termination. The device has two terminals: anode and cathode, with the cathode electrically connected to the exposed metal base (bottom side). This configuration enables low-inductance, high-current path routing and efficient thermal conduction to the PCB copper pour or heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for bidirectional conduction | Connected to protected line; forms symmetrical avalanche path with cathode during both polarity transients |
| Cathode (Metal Base) | Common reference terminal / thermal interface | Exposed metal bottom serves as primary heat sink interface and electrical return; must be soldered to large copper area |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or ungrounded power rails without polarity constraints |
| 18 kW peak pulse rating | Supports single-device compliance with RTCA DO-160 Section 22 Level 4 multi-stroke lightning testing |
| 0.7 °C/W RθJC | Allows >10× higher steady-state power dissipation than standard SMD TVS when heatsink-mounted |
| AEC-Q101 qualified | Validated for automotive under-hood applications including alternator load dump and battery reverse connection events |
| e3 RoHS-compliant plating | Matte-tin terminations ensure reliable solderability and long-term intermetallic stability per MIL-STD-750 Method 2026 |
Applications
| Aircraft Avionics Power Input | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protection of 28 V DC power inputs in flight control computers subjected to DO-160 Section 22 lightning-induced transients. IC Role / Device Role / Timing Role: Primary parallel-connected surge clamp absorbing multi-stroke 18 kW pulses without degradation. Use Value: Enables compliance with Level 4 pin-injection (Waveform 4) and secondary lightning (IEC 61000-4-5, 42 Ω) requirements using one discrete device. | Use Scenario: Guarding microcontroller power rails in engine bay ECUs exposed to 12 V load dump events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Fast-response shunt protector diverting >400 A transients away from LDOs and MCU VDD pins. Use Value: Prevents latch-up and permanent damage during 100 ms, 120 V load dump surges while maintaining <10 μA standby leakage. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Safeguarding 24–32 V DC bus lines in variable-frequency drives from switching-induced voltage spikes and ground bounce. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across bus rails to suppress both positive and negative polarity transients. Use Value: Eliminates need for dual-unidirectional TVS devices; reduces PCB area by 35% and improves symmetry in high-di/dt layouts. | Use Scenario: Protecting 24 V signaling lines in track-side electronic interlocking units from induced surges during nearby lightning strikes. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), clamping residual energy below equipment withstand level. Use Value: Achieves IEC 61000-4-5 Class 4 immunity (4 kV, 42 Ω) with <5 ns response, preventing false triggering of safety relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA | 600 W PPP rating, 3.5 mm × 4.5 mm SMB package, RθJC ≈ 25 °C/W | Not suitable for DO-160 Level 4 or IEC 61000-4-5 Class 4; limited to consumer-grade surge events | Select SMBJ26CA only for cost-sensitive, low-energy industrial controls where 18 kW capability is unnecessary |
| SMCJ26CA | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJC ≈ 12 °C/W | Meets IEC 61000-4-5 Class 2 but fails Class 4 due to lower clamping margin and thermal limit | Choose SMCJ26CA for automotive body electronics with moderate surge exposure, not for safety-critical avionics or rail signaling |
Compared with SMBJ26CA and SMCJ26CA, MAPLAD18KP26CAE3 delivers 30× and 12× higher peak pulse power respectively, with 35× and 17× lower junction-to-case thermal resistance-enabling sustained multi-stroke lightning protection where legacy SMC/SMB packages thermally saturate.
Availability
MAPLAD18KP26CAE3 is available at Aetrix Electronics and suitable for aircraft avionics, automotive engine control units, industrial motor drives, and railway signaling systems requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD18KP26CAE3 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 MAPLAD series was developed specifically for high-power, surface-mount transient suppression in mission-critical platforms where multi-stroke lightning resilience, thermal robustness, and AEC-Q101/MIL-qualified reliability are mandatory.
FAQ
What is the clamping voltage of MAPLAD18KP26CAE3 at its rated peak impulse current?
The clamping voltage VC of MAPLAD18KP26CAE3 is guaranteed ≤42.1 V at 428 A peak impulse current (IPP) under 10/1000 μs waveform conditions. This value ensures downstream circuitry remains within safe operating limits during worst-case lightning transients. MAPLAD18KP26CAE3 achieves this performance through optimized silicon geometry and low-inductance metal-base packaging, directly validated in RTCA DO-160 Section 22 testing.
Is MAPLAD18KP26CAE3 qualified for automotive applications?
Yes, MAPLAD18KP26CAE3 is AEC-Q101 qualified and explicitly rated for automotive load dump protection per ISO 7637-2 Pulse 5a. Its 18,000 W peak pulse power, 26 V standoff, and bidirectional operation make it suitable for engine control units, battery management systems, and ADAS domain controllers exposed to harsh under-hood environments. MAPLAD18KP26CAE3 also supports optional MIL-PRF-19500 screening for extended temperature and reliability validation.
How does the metal base of MAPLAD18KP26CAE3 affect PCB layout and thermal design?
The metal base of MAPLAD18KP26CAE3 serves as both the cathode terminal and primary thermal interface. It must be soldered to a minimum 100 mm² copper pour or external heatsink to achieve the specified 0.7 °C/W RθJC. Layout requires symmetric thermal vias beneath the base and avoidance of solder mask over the metal area. MAPLAD18KP26CAE3's thermal performance degrades significantly if the base is insulated or undersized-directly impacting its 18 kW surge capability.
Does MAPLAD18KP26CAE3 meet IEC 61000-4-5 for industrial equipment?
Yes, MAPLAD18KP26CAE3 is certified for IEC 61000-4-5 Class 4 secondary lightning protection with 42 Ω source impedance, delivering 4 kV immunity. It also supports Class 2 and 3 with 12 Ω and 2 Ω sources. This compliance is verified per test waveform definitions and documented in Microsemi RF01215 Rev B. MAPLAD18KP26CAE3's low clamping voltage (≤42.1 V) and fast response (<5 ns) ensure protected circuits remain functional during standardized surge events.
What does the "CA" suffix and "E3" suffix indicate in MAPLAD18KP26CAE3?
The "CA" suffix denotes bidirectional polarity, confirming symmetric clamping for both positive and negative transients. The "E3" suffix specifies RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity-requiring no dry pack and enabling standard reflow profiles. Together, MAPLAD18KP26CAE3 identifies a bidirectional, lead-free, high-reliability TVS optimized for aerospace and automotive use cases where polarity flexibility and process compatibility are essential.
MAPLAD18KP26CAE3 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 428A
- 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
MAPLAD18KP26CAE3 FAQ
1.How can I place an order for MAPLAD18KP26CAE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP26CAE3 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 MAPLAD18KP26CAE3 reliable?
The price and inventory of MAPLAD18KP26CAE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP26CAE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP26CAE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP26CAE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP26CAE3?
MAPLAD18KP26CAE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP26CAE3 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 MAPLAD18KP26CAE3?
For technical support, including MAPLAD18KP26CAE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP26CAE3 requirements.
6.How does Aetrix verify that MAPLAD18KP26CAE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP26CAE3 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 MAPLAD18KP26CAE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP26CAE3?
All MAPLAD18KP26CAE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP26CAE3, 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 MAPLAD18KP26CAE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP26CAE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP26CAE3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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