How to Select a Protection Scheme for the Data Interface of a Spirometer?

Data interface protection requires a balance between suppressing interference and maintaining signal integrity. For high-speed data interfaces like USB, TVS arrays with low clamping voltage and low junction capacitance should be selected for electrostatic protection—for example, the ESDSR05, whose picofarad-level capacitance has minimal impact on signal edges. Simultaneously, series common-mode chokes on differential signal lines, such as the CMZ2012A-900T, can effectively filter out common-mode noise without affecting differential signal quality. This combination of "common-mode inductor + TVS array" can address both conducted noise and transient pulse impacts.