**Part Number:**CDC3RL02

For the CDC3RL02, I have see two posts stating that the LDO capacitor must have a minimum ESR of 100-mOhms and a maximum of 1000-mOhms. Only the minimum is stated in the spec. There is no reference design for the CDC3RL02 to show what actual BOM part was used for the LDO capacitor.

In my experience, a ceramic capacitor will be lower than 100-mOhms and a tantalum (smaller body) will be larger than 1000-mOhms. Therefore, other than adding a discrete resistor, I am not sure what native capacitor would be recommended for a design. We don't want a capacitor that is larger than the part we are using it on.

In one post, the LMH2191TM reference design was listed as a "substitute" reference design for the CDC3RL02. Looking at the LMH2191TM, it looks to possibly be a National Semicoductor version of the TI CDC3RL02 version. The LMH2191TM only needs 5-mOhm to 500-mOhm ESR, which is in the range of most MLCCs.

Are the LMH2191TM and the CDC3RL02 equivalent sister parts, such that the LMH2191TM can be used instead to use regular parts.

For the CDC3RL02, is 1000-mOhms really the maximum? We have a tanatlum polymer parts that is 0402, 2.2uF, 6.3V and 1500-mOhms.

Is there a recommended capacitor for the CDC3RL02 that meets the requirements?

We would rather not redo our PCBs to add the resistor to control the ESR.

Matt