When looking at the SMD Varistors from Stackpole Electronics, you may find two different colors.
As one example, the part number ZV60K2220T801N is generally shown as black.:
However, sometimes you may receive the varistors in different colors. The reference photos are as below:
Stackpole Electronics has confirmed that both colors are acceptable for use and correct. Please kindly refer to the below, from Stackpole Electronics:
“The factory replied and they confirmed that the optical variation does not affect part functionality.
The ceramic body of the part is covered with a glass coating that contains silica. The silica in the glass creates this color shading phenomenon.”
Applicable part numbers
ZV25K1210T401NTR-ND,ZV25K1210T401NCT-ND,ZV25K1210T401NDKR-ND
ZV35K1210T251NTR-ND,ZV35K1210T251NCT-ND,ZV35K1210T251NDKR-ND
ZV130K1812T301NTR-ND,ZV130K1812T301NCT-ND,ZV130K1812T301NDKR-ND
ZV25K1812T801NTR-ND,ZV25K1812T801NCT-ND,ZV25K1812T801NDKR-ND
ZV30K2220T122NTR-ND,ZV30K2220T122NCT-ND,ZV30K2220T122NDKR-ND
ZV17K1206T201NTR-ND,ZV17K1206T201NCT-ND,ZV17K1206T201NDKR-ND
ZV20K1206T201NTR-ND,ZV20K1206T201NCT-ND,ZV20K1206T201NDKR-ND
ZV30K1206T201NTR-ND,ZV30K1206T201NCT-ND,ZV30K1206T201NDKR-ND
ZV35K1206T121NTR-ND,ZV35K1206T121NCT-ND,ZV35K1206T121NDKR-ND
ZV14K1206T201NTR-ND,ZV14K1206T201NCT-ND,ZV14K1206T201NDKR-ND
ZV14K1210T401NTR-ND,ZV14K1210T401NCT-ND,ZV14K1210T401NDKR-ND
PV275K4032TTR-ND,PV275K4032TCT-ND
738-ZV130K2220T501NTR-ND,738-ZV130K2220T501NCT-ND,738-ZV130K2220T501NDKR-ND
ZV50K2220T801NTR-ND,ZV50K2220T801NCT-ND,ZV50K2220T801NDKR-ND
738-ZV35K1812T601NTR-ND,738-ZV35K1812T601NCT-ND,738-ZV35K1812T601NDKR-ND
ZV25K1206T201NTR-ND,ZV25K1206T201NCT-ND,ZV25K1206T201NDKR-ND
ZV20K1210T401NTR-ND,ZV20K1210T401NCT-ND,ZV20K1210T401NDKR-ND
ZV17K1210T401NTR-ND,ZV17K1210T401NCT-ND,ZV17K1210T401NDKR-ND
PV300K4032TTR-ND,PV300K4032TCT-ND
PV275K3225TTR-ND,PV275K3225TCT-ND,PV275K3225TDKR-ND
PV150K4032TTR-ND,PV150K4032TCT-ND
738-ZV60K1812T401NTR-ND,738-ZV60K1812T401NCT-ND,738-ZV60K1812T401NDKR-ND
738-ZV50K1812T401NTR-ND,738-ZV50K1812T401NCT-ND,738-ZV50K1812T401NDKR-ND
738-ZV95K1812T301NTR-ND,738-ZV95K1812T301NCT-ND,738-ZV95K1812T301NDKR-ND
738-ZV30K1812T801NTR-ND,738-ZV30K1812T801NCT-ND,738-ZV30K1812T801NDKR-ND
738-ZV95K2220T501NTR-ND,738-ZV95K2220T501NCT-ND,738-ZV95K2220T501NDKR-ND
PV300K3225TTR-ND,PV300K3225TCT-ND,PV300K3225TDKR-ND
ZV40K1812T601NTR-ND,ZV40K1812T601NCT-ND,ZV40K1812T601NDKR-ND
ZV30K1210T301NTR-ND,ZV30K1210T301NCT-ND,ZV30K1210T301NDKR-ND
PV150K3225TTR-ND,PV150K3225TCT-ND,PV150K3225TDKR-ND
738-ZV4M0603T300N-ND
738-ZV17K0603T300N-ND
738-ZV11K0805T121N-ND
738-ZV4M0805T101N-ND
738-ZV30K0805T121N-ND
738-ZV2M0805T101N-ND
738-ZV14K0805T121N-ND
738-ZV8L0805T121N-ND
738-ZV25K0805T121N-ND
738-ZV6M0805T101N-ND
738-ZV17K0805T121N-ND
738-ZV20K0805T121N-ND
738-ZV17K0805K121N-ND
738-ZV4M1206T151N-ND
738-ZV40K1206G121N-ND
738-ZV2M1206T151N-ND
738-ZV40K1206T121N-ND
738-ZV11K1206T201N-ND
738-ZV75K1206T121N-ND
738-ZV8L1206T201N-ND
738-ZV60K1206T121N-ND
738-ZV20K1206K201N-ND
738-ZV17K1206G201N-ND
738-ZV50K1206T121N-ND
738-ZV6M1206T151N-ND
738-ZV11K1210T401N-ND
738-ZV40K1210T251N-ND
738-ZV60K1210T251N-ND
738-ZV95K1210T201N-ND
738-ZV75K1210T251N-ND
738-ZV50K1210T251N-ND
738-ZV14K1210J501N-ND
738-ZV35K1210G251N-ND
738-AV17K0805K121N-ND
738-AV14K0805T121N-ND
738-ZV115K1210T201N-ND
738-ZV4M1210T251N-ND
738-ZV130K1210T201N-ND
738-ZV8L1210T401N-ND
738-ZV6M1210T301N-ND
738-AV14K1206T201N-ND
738-AV14K0805K121N-ND
738-PV60K3225T-ND
738-PV230K3225T-ND
738-PV250K3225T-ND
738-PV115K3225T-ND
738-PV130K3225T-ND
738-PV140K3225T-ND
738-PV95K3225T-ND
738-PV175K3225T-ND
738-PV75K3225T-ND
738-AV40K1210T401N-ND
738-AV30K1210T401N-ND
738-PV250K4032T-ND
738-PV230K4032T-ND
738-PV175K4032T-ND
738-PV115K4032T-ND
738-PV75K4032T-ND
738-PV95K4032T-ND
738-PV130K4032T-ND
738-PV140K4032T-ND
738-ZV35K1812T301N-ND
738-ZV115K1812T301N-ND
738-ZV11K1812T801N-ND
738-ZV4M1812T501N-ND
738-ZV17K1812T801N-ND
738-ZV6M1812T501N-ND
738-ZV20K1812T801N-ND
738-ZV75K1812T401N-ND
738-ZV14K1812T801N-ND
738-ZV8L1812T501N-ND
738-AV20K1812T801N-ND
738-AV30K2220T122N-ND
738-AV14K2220T202N-ND
738-ZV115K2220T501N-ND
738-ZV11K2220T122N-ND
738-ZV4M2220T102N-ND
738-ZV75K2220T801N-ND
738-ZV17K2220T122N-ND
738-ZV20K2220T122N-ND
738-ZV6M2220T122N-ND
738-ZV14K2220T122N-ND
738-ZV8L2220T122N-ND
738-ZV25K2220T122N-ND
738-ZV35K2220T102NTR-ND,738-ZV35K2220T102NCT-ND,738-ZV35K2220T102NDKR-ND
738-ZV40K2220T102NTR-ND,738-ZV40K2220T102NCT-ND,738-ZV40K2220T102NDKR-ND
738-ZV60K2220T801NTR-ND,738-ZV60K2220T801NCT-ND,738-ZV60K2220T801NDKR-ND
738-AV14K3225G402N-ND
738-AV30K3225G202N-ND
738-AV30K3225T202N-ND
ZV25K1210T401N
ZV35K1210T251N
ZV130K1812T301N
ZV25K1812T801N
ZV30K2220T122N
ZV17K1206T201N
ZV20K1206T201N
ZV30K1206T201N
ZV35K1206T121N
ZV14K1206T201N
ZV14K1210T401N
PV275K4032T
ZV130K2220T501N
ZV50K2220T801N
ZV35K1812T601N
ZV25K1206T201N
ZV20K1210T401N
ZV17K1210T401N
PV300K4032T
PV275K3225T
PV150K4032T
ZV60K1812T401N
ZV50K1812T401N
ZV95K1812T301N
ZV30K1812T801N
ZV95K2220T501N
PV300K3225T
ZV40K1812T601N
ZV30K1210T301N
PV150K3225T
ZV4M0603T300N
ZV17K0603T300N
ZV11K0805T121N
ZV4M0805T101N
ZV30K0805T121N
ZV2M0805T101N
ZV14K0805T121N
ZV8L0805T121N
ZV25K0805T121N
ZV6M0805T101N
ZV17K0805T121N
ZV20K0805T121N
ZV17K0805K121N
ZV4M1206T151N
ZV40K1206G121N
ZV2M1206T151N
ZV40K1206T121N
ZV11K1206T201N
ZV75K1206T121N
ZV8L1206T201N
ZV60K1206T121N
ZV20K1206K201N
ZV17K1206G201N
ZV50K1206T121N
ZV6M1206T151N
ZV11K1210T401N
ZV40K1210T251N
ZV60K1210T251N
ZV95K1210T201N
ZV75K1210T251N
ZV50K1210T251N
ZV14K1210J501N
ZV35K1210G251N
AV17K0805K121N
AV14K0805T121N
ZV115K1210T201N
ZV4M1210T251N
ZV130K1210T201N
ZV8L1210T401N
ZV6M1210T301N
AV14K1206T201N
AV14K0805K121N
PV60K3225T
PV230K3225T
PV250K3225T
PV115K3225T
PV130K3225T
PV140K3225T
PV95K3225T
PV175K3225T
PV75K3225T
AV40K1210T401N
AV30K1210T401N
PV250K4032T
PV230K4032T
PV175K4032T
PV115K4032T
PV75K4032T
PV95K4032T
PV130K4032T
PV140K4032T
ZV35K1812T301N
ZV115K1812T301N
ZV11K1812T801N
ZV4M1812T501N
ZV17K1812T801N
ZV6M1812T501N
ZV20K1812T801N
ZV75K1812T401N
ZV14K1812T801N
ZV8L1812T501N
AV20K1812T801N
AV30K2220T122N
AV14K2220T202N
ZV115K2220T501N
ZV11K2220T122N
ZV4M2220T102N
ZV75K2220T801N
ZV17K2220T122N
ZV20K2220T122N
ZV6M2220T122N
ZV14K2220T122N
ZV8L2220T122N
ZV25K2220T122N
ZV35K2220T102N
ZV40K2220T102N
ZV60K2220T801N
AV14K3225G402N
AV30K3225G202N
AV30K3225T202N