Authorization Code = 7 min
Access Token = 86400 seconds, or 24 hours
Refresh Token = never expires unless exchanged for a new Access Token (since you will get new refresh token with it ) .
Authorization Code - granted after authorizing client application with Digikey.com login credentials,used to receive access token.
Access Token - used to make requests
Refresh Token - Used when Access Token is expired. Submit refresh token to receive valid Access Token.