Why is 74LS47 BCD Decoder painfully expensive?

[Porama6400]

Well it still lower than 1 USD / piece but for bulk purchase it still expensive

I don't understand why is 74LS47 BCD Decoder painfully expensive?
It just some logic gate stick together, but why it is more expensive than regular Op-amp?

[Gribo]

Low volume, ancient technology = High price.

[TimNJ]

Probably because no one really buys them anymore, and they don't make much sense for new designs.

[Porama6400]

So 7-segment is dying?
(I never really use it so I don't know  )

[David Hess]

$1.5 in single unit quantities does not strike me as particularly expensive; the 7447 and 74LS47 were always relatively expensive.

The less expensive CMOS 4511 can be used if you do not require ripple blanking.

A modern design would replace it with a microcontroller at 1/3rd the price or more likely drive 4 to 8 multiplexed digits with a single microcontroller for 1/2 the price of a 74LS47.

So 7-segment is dying?

7-segment displays are not going anywhere.  There are just less expensive and more integrated ways to drive them now.

[Zero999]

The '4511 is for driving common cathode displays, whist the '7447 was for common anode.

I agree, if this is a new design, use a microcontroller and get rid of many other pointless ICs.