When you are looking at Diode Arrays from onsemi you will see some of the parts have an S prefix. This prefix is calling out an Automotive AEC-Q101 rating.
i.e BAS70-04LT1GOSTR-ND would be the standard part and SBAS70-04LT1GOSTR-ND would be an Automotive, AEC-Q101 part.
From the manufacturer’s data sheet.
• S Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q101 Qualified and PPAP Capable.
Applicable Part Numbers
SBAS70-04LT1GOSTR-ND SBAS70-04LT1GOSCT-ND SBAS70-04LT1GOSDKR-ND SBAV99WT1GOSTR-ND SBAV99WT1GOSCT-ND SBAV99WT1GOSDKR-ND SBAV70WT1GOSTR-ND SBAV70WT1GOSCT-ND SBAV70WT1GOSDKR-ND SBAT54CLT1GOSCT-ND SBAT54CLT1GOSDKR-ND SBAV99LT1GOSTR-ND SBAV99LT1GOSCT-ND SBAV99LT1GOSDKR-ND NSVBAS21TMR6T1GOSCT-ND NSVBAS21TMR6T1GOSDKR-ND NSVBAV23CLT1GOSCT-ND NSVBAV23CLT1GOSDKR-ND NSVBAT54SWT1GOSCT-ND NSVBAT54SWT1GOSDKR-ND SB05W05C-TB-EOSTR-ND SB05W05C-TB-EOSCT-ND SB05W05C-TB-EOSDKR-ND FFB20UP20DN-F085TR-ND FFB20UP20DN-F085CT-ND FFB20UP20DN-F085DKR-ND BAT54CLT3GOSCT-ND BAT54CLT3GOSDKR-ND SBAV70LT1GOSTR-ND SBAV70LT1GOSCT-ND SBAV70LT1GOSDKR-ND SM1MA142WKT1G-ND NSD070ALT1G-ND NSVM1MA141WAT1G-ND NSVBAV70TT3G-ND SM1MA142WAT1G-ND SBAV70LT3G-ND BAS21TMR6T1G-ND NSVBAV70TT1G-ND NSVDAN222T1G-ND NSVM1MA152WAT1G-ND NSVM1MA152WKT1G-ND SM1MA151WKT1G-ND SBAS21DW5T3G-ND NSVBAV70DXV6T5G-ND SHN2D02FUTW1T1G-ND NSVMBD54DWT1G-ND NHP620MFDT3G-ND NRVHP620MFDT3G-ND NRVHP620MFDT1G-ND RURD620CCS9A-F085TR-ND RURD620CCS9A-F085CT-ND RURD620CCS9A-F085DKR-ND NRVBD660CTRLG-VF01-ND NRVBD650CTG-VF01-ND NRVBB40L45CTT4G-ND SBRD81035CTLG-VF01-ND SBRB20100CTT4G-ND SURHB8840CTT4G-ND NRVBB60H100CTT4G-ND RHRG1560CC-F085-ND RURG3060CC-F085-ND FFB20UP20DN-F085-ND RURD620CCS9A-F085-ND
SBAS70-04LT1G SBAS70-04LT1G SBAS70-04LT1G SBAV99WT1G SBAV99WT1G SBAV99WT1G SBAV70WT1G SBAV70WT1G SBAV70WT1G SBAT54CLT1G SBAT54CLT1G SBAV99LT1G SBAV99LT1G SBAV99LT1G NSVBAS21TMR6T1G NSVBAS21TMR6T1G NSVBAV23CLT1G NSVBAV23CLT1G NSVBAT54SWT1G NSVBAT54SWT1G SB05W05C-TB-E SB05W05C-TB-E SB05W05C-TB-E FFB20UP20DN-F085 FFB20UP20DN-F085 FFB20UP20DN-F085 BAT54CLT3G BAT54CLT3G SBAV70LT1G SBAV70LT1G SBAV70LT1G SM1MA142WKT1G NSD070ALT1G NSVM1MA141WAT1G NSVBAV70TT3G SM1MA142WAT1G SBAV70LT3G BAS21TMR6T1G NSVBAV70TT1G NSVDAN222T1G NSVM1MA152WAT1G NSVM1MA152WKT1G SM1MA151WKT1G SBAS21DW5T3G NSVBAV70DXV6T5G SHN2D02FUTW1T1G NSVMBD54DWT1G NHP620MFDT3G NRVHP620MFDT3G NRVHP620MFDT1G RURD620CCS9A-F085 RURD620CCS9A-F085 RURD620CCS9A-F085 NRVBD660CTRLG-VF01 NRVBD650CTG-VF01 NRVBB40L45CTT4G SBRD81035CTLG-VF01 SBRB20100CTT4G SURHB8840CTT4G NRVBB60H100CTT4G RHRG1560CC-F085 RURG3060CC-F085 FFB20UP20DN-F085 RURD620CCS9A-F085