How do I tell the end-to-end RAB resistance value?

Take AD8400 as an example. The markings AD8400AR1, AD8400AR10, ADR8400AR50, AD8400AR100 (AD8400ARC) stand for 1kΩ, 10kΩ, 50kΩ, and 100kΩ parts respectively. Some parts may have different value designators from these. For example, our very compact packages such as SOT, SC-70, or MSOP are branded with 3-letter codes. Please consult the datasheet prior to ordering.