If you are looking for surface finish details for the Delevan SDS680R series of fixed inductors, here is the response from the manufacturer:
The terminal features a Nickel over Moly-Manganese surface finish with Gold plating.
Applicable Part Number
| DigiKey Part Number | Manufacturer Part Number |
|---|---|
| DN7562TR-ND,DN7562CT-ND,DN7562DKR-ND | SDS680R-106M |
| DN7548TR-ND,DN7548CT-ND,DN7548DKR-ND | SDS680R-473M |
| DN7558TR-ND,DN7558CT-ND,DN7558DKR-ND | SDS680R-225M |
| DN7546TR-ND,DN7546CT-ND,DN7546DKR-ND | SDS680R-223M |
| DN7545TR-ND,DN7545CT-ND,DN7545DKR-ND | SDS680R-153M |
| DN7556TR-ND,DN7556CT-ND,DN7556DKR-ND | SDS680R-105M |
| DN7544TR-ND,DN7544CT-ND,DN7544DKR-ND | SDS680R-103M |
| DN7552TR-ND,DN7552CT-ND,DN7552DKR-ND | SDS680R-224M |
| DN7542TR-ND,DN7542CT-ND,DN7542DKR-ND | SDS680R-472M |
| DN7549TR-ND,DN7549CT-ND,DN7549DKR-ND | SDS680R-683M |
| DN7547TR-ND,DN7547CT-ND,DN7547DKR-ND | SDS680R-333M |
| DN7550TR-ND,DN7550CT-ND,DN7550DKR-ND | SDS680R-104M |
| DN7543TR-ND,DN7543CT-ND,DN7543DKR-ND | SDS680R-682M |
| DN7541TR-ND,DN7541CT-ND,DN7541DKR-ND | SDS680R-332M |
| DN7538TR-ND,DN7538CT-ND,DN7538DKR-ND | SDS680R-102M |
| DN7560TR-ND,DN7560CT-ND,DN7560DKR-ND | SDS680R-475M |
| DN7561TR-ND,DN7561CT-ND,DN7561DKR-ND | SDS680R-685M |
| DN7540TR-ND,DN7540CT-ND,DN7540DKR-ND | SDS680R-222M |
| DN7539TR-ND,DN7539CT-ND,DN7539DKR-ND | SDS680R-152M |
| DN7551TR-ND | SDS680R-154M |
| DN7553TR-ND | SDS680R-334M |
| DN7554TR-ND | SDS680R-474M |
| DN7557TR-ND | SDS680R-155M |
| DN7559TR-ND | SDS680R-335M |
| DN7555TR-ND,DN7555CT-ND,DN7555DKR-ND | SDS680R-684M |
| SDS680R-822M-ND | SDS680R-822M |