The BU4S11 is a dual-input positive logic NAND gate. This is an ultra-compact logic IC with one circuit of the BU4011B built into an SMP package.

FEATUREs
1) Low current dissipation.
2) Super-mini mold package designed for surface mounting.
3) Wide range of operating power supply voltage.
4) Capable of driving two L-TTL inputs and one LS-TTL input directly