ISO7240CFDW datasheet(35/46 Pages) TI1

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ISO7240CF, ISO7240C, ISO7240M

ISO7241C, ISO7241M, ISO7242C, ISO7242M

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SLLS868R – SEPTEMBER 2007 – REVISED SEPTEMBER 2015

13 Device and Documentation Support

13.1 Device Support

13.1.1 Isolation Glossary

Primary Circuit — A circuit that is directly connected to an external mains supply for its power needs.

Secondary Circuit — A circuit that has no direct connection to a primary circuit and derives its power from a

transformer, converter or equivalent isolation device, or from a battery.

Creepage — The shortest distance between two conductive parts measured along the surface of a solid

insulation. The shortest path is typically found around the end of the package body.

Clearance — The shortest distance between two conductive parts measured through air.

Isolation Capacitance (CIO) — The total capacitance between the terminals on a first side of the isolation barrier

connected together and the terminals on a second side of the isolation barrier connected together forming a two-

terminal device.

Isolation Resistance (RIO) — The resistance between the terminals on a first side of the isolation barrier

connected together and all the terminals on a second side of the isolation barrier connected together forming a

two-terminal device.

Rated Isolation Voltages — The maximum voltage between all input terminals (connected together) and all

output terminals (connected together) respectively.

Maximum Rated Isolation Working Voltage (VIOWM) — An r.m.s or equivalent d.c. voltage assigned by the

manufacturer, characterizing the specified long term withstand capability of its isolation.

Maximum Rated Repetitive Peak Isolation Voltage (VIORM) — A peak voltage assigned by the manufacturer,

characterizing the specified withstand capability of its isolation against repetitive peak voltages. It includes all

repetitive transient voltages, but excludes all non-repetitive transient voltages.

Maximum Rated Transient Isolation Voltage (VIOTM) — A peak impulse voltage assigned by the manufacturer,

characterizing the specified withstand capability of its isolation against transient overvoltages.

Withstand Isolation Voltage (VISO) — Maximum AC r.m.s. isolation voltage for one minute.

Surge Isolation Voltage (VIOSM) — The highest instantaneous value of an isolation voltage pulse with short time

duration and of specified wave shape.

Partial Discharge — Localized electrical discharge which occurs in the insulation between all terminals of the

first side and all terminals of the second side of the coupler.

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