Product Description

The SMCJ40A is a 1500W unidirectional TVS diode in the standard DO-214AB (SMC) package. Designed to protect sensitive electronics, it clamps high-energy transients and surges from lightning, ESD, and inductive switching. With a 40V standoff voltage, it is a direct, reliable, and cost-effective replacement for equivalent parts from NXP and Littelfuse, ensuring robust circuit protection in industrial, automotive, and telecom applications.The SMCJ40A has extremely fast response time (sub-nanosecond level) and very high surge absorption capability. Designed specifically to protect sensitive electronic equipment in circuit applications from voltage transients caused by lightning strikes and other transient voltage events.

Key Parameters

  • Standoff Voltage: 40V – It sits quietly on your 40V rail, minding its own business during normal operation.
  • Breakdown Voltage: 44.4V - 49.1V @1mA – The moment voltage spikes past this range, it wakes up instantly and jumps into action.
  • Clamping Voltage: 58.1V at 25.9A – Even during a serious surge, it holds the line to keep your sensitive chips under 58V.
  • Peak Pulse Power: 1500W – This thing absorbs brutal transient energy like a miniature surge superhero.
  • Ultra-low leakage: Just 1µA – It barely sips any power, so it won’t load your circuit or waste energy.

Typical Applications

  • Industrial Electronics: Protection for PLCs, motor drives, and control systems.
  • Telecommunications: Safeguarding communication lines and data interfaces.
  • Automotive Systems: Protecting ECUs, sensors, and CAN bus networks.
  • Power Supplies: Preventing damage from inductive load switching.
  • Consumer Electronics: Shielding sensitive circuits in appliances and computing devices

Find the TVS Diode you’re looking for by browsing our products as below:

https://en.semiware.com/product-general-tvs/smcj40a

About Semiware
Semiware has a comprehensive product lineup of circuit protection device products. The company leverages its technology in the semiconductor field and application background in end products to serve customers in the electronics, automotive and industrial markets. For more information, please visit semiware official website:https://en.semiware.com/

Looking for reliable surge protection solutions? Contact us for SMCJ40A datasheet, samples, and bulk pricing.👇

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