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NC7SZ126M5X Application Field and Working Principle

The NC7SZ126M5X is a low-voltage single pole double through (SPDT) automotive-qualified switch with integrated high-ESR True ESD protection. It isa member of the Automotive Edge Logic™ family of micro-sized CMOS logic devices.

The device operates from a 1.8V to 3.6V supply and has an output drive capability of up to 10mA. A logic high at the enable input turns the switch on, connecting a to b, or a logic low turns the switch off, connecting a and b to the off state. The NC7SZ126M5X also has an active-low output enable (OE) which can be used to enable and disable the switch output.

The device is qualified in compliance with the Automotive Electronics Council (AEC) Q100 stress test qualification and is RoHS compliant. It is suitable for harsh automotive applications such as climate control, body and engine controllers, anti-lock brake systems and other automotive applications.

Working Principle

The NC7SZ126M5X feature an integrated True ESD protection and a user-settable 3-level enable feature. The device offers an enable input logic thresholds of -0.5V, 0V, and +0.5V. This allows the user to control the switch by putting logic thresholds outside the typical CMOS voltage range of VIL, VIH and VOL, VOH.

The NC7SZ126M5X utilizes a SPDT architecture, which is a simplified form of CMOS switch made up of two complementary transistors. One transistor is turned on when the enable input is asserted and the other is turned off. This action closes the switch between the two nodes, providing a low resistance connection.

In addition to the SPDT switch functions, the NC7SZ126M5X also includes an active-low output enable (OEN) pin, which allows the user to enable and disable the switch output. When the OEN pin is asserted low, the output is disabled and the switch remains in an open state, regardless of the enable input. This feature prevents the driver from receiving false signals when the enable input voltage is in the OFF region.

Advantages

This low-voltage SPDT switch from ON Semiconductor offers several advantages. By utilizing an integrated True ESD protection, it has excellent ESD tolerance. This prevents dangerous surges from damaging sensitive circuitry and also provides a secure solution for harsh environments. The 3-level enable feature is also a great advantage, allowing users to control the switch at levels outside the typical CMOS voltage range.

The NC7SZ126M5X also features a low-power consumption, making it suitable for battery-powered applications. Its small package size makes it easier to fit in tight spaces, while its automotive-qualified design makes it ideal for automotive applications. In addition, its fast switching time of 4.5ns makes it suitable for high-speed applications.

Conclusion

The NC7SZ126M5X SPDT switch from ON Semiconductor is an excellent choice for automotive and industrial applications. With integrated ESD protection and a three-level enable feature, it offers superior performance and reliability. Its low-power consumption and small package size make it well-suited for battery-powered and space-constrained applications. Its fast switching time and automotive-qualifications make it suitable for high-speed and harsh automotive applications.

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