I have been trying to find a DPDT 5 VDC DIP 0.5A relay. So far I have not found one on Digi-key. But I am certain that it exist. Does anyone know part number to look for?
Take a look at these products and see if one among them would do the trick for you.
It appears that you are correct about no 5.0vdc coil DPDT relays rated at 0.5amp. The closest will be general purpose relays rated at 1.0amp When moving up to 1.0amp contracts, The contact life may be extended. I have located 8 general purpose 5.0volt rated at 1.0amp Here are the part numbers.
Kemet surface mount part number EB2-5NU, Digi-Key part number 399-1735-5-ND
Kemet through hole part number UA2-5NU, Digi-Key part number UA2-5NU-ND
Omron through hole part number G5V-2-H1 DC5, Digi-Key part number Z108-ND
Kemet through hole part number UA2-5NJ, Digi-Key part number 399-UA2-5NJ-ND.
Kemet through hole part number EA2-5NJ, Digi-Key part number 399-EA2-5NJ-ND
Kemet through hole part number UC2-5NU, Digi-Key part number UC2-5NU-ND
Kemet surface mount part number UB2-5NUN-L, Digi-Key part number 399-UB2-5NUN-LCT-ND
Kemet surface mount part number UD2-5NUN-L, Digi-Key part number 399-UD2-5NUN-LCT-ND
If you click on the Digi-Key part numbers you will link to the US web page.
The technical reference number is T4184354