Datasheet

SN65220 , SN65240 , SN75240
www.ti.com SLLS266H –FEBRUARY 1997–REVISED MAY 2015
10.3 Feature Description
The SN65220, SN65240, and SN75240 family of unidirectional transient voltage suppressors provide transient
protection to Universal Serial Bus low and full−speed ports. These TVS diodes provide a minimum breakdown
voltage of 6.5V to protect USB transceivers and USB ASICs typically implemented in 3-V or 5-V digital CMOS
technology.
10.4 Device Functional Modes
TVS diodes possess two functional modes, a high-impedance and a conducting mode.
During normal operating conditions, that is in the absence of high voltage transients, the breakdown voltage of
TVS diodes is not exceeded and the devices remain high-impedance.
In the presence of high-voltage transients the breakdown voltage is exceeded. The TVS diodes then conduct and
become low-impedance. In this mode excessive transient energy is shunted directly to local circuit ground,
preventing USB transceivers from electrical damage.
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Product Folder Links: SN65220 SN65240 SN75240