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LMxx obsolescete?

I was told by our purchasing group to redesign the following parts because of obsolescence. Can you help check if this is the case? It seems that they are just changing from leaded to unleaded version. Any sign of obsoleting these NOPB parts in the near future? Thanks.

LM20BIM7 TI

TEMP SENSOR, VOLT OUTPUT, SC70-5

LM20BIM7/NOPB is active

LM2587S-ADJ TEXAS INSTRUMENTS INC

5 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PSSO5

LM2587S-ADJ/NOPB is active

LM4040AIM3-5.0 TEXAS INSTRUMENTS INC

1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, PDSO3

LM4040AIM3-5.0/NOPB is active

 Cheers

Calum