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LM6142BIMX was discontinued. LM6142BIM is the same chip packaged in a tube, but it's LTB. You should use the lead-free version, LM6142BIMX/NOPB.
The G4 suffix essentially indicates NiPdAu lead finish. But there is no other lead finish, so these OPNs were discontinued. OPA2251PA and TLV1570CPW are identical to those.
Hello Jinisha,
For LM6142BIMX use LM6142BIMX/NOPB ; National parts made the name longer
For OPA2251PAG4 use OPA2251PA ; TI parts made the name shorter
For TLV1570CPWG4 use TLV1570CPW; ; TI parts made the name shorter