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Texas Instruments SN74LS55D — Memory (DRAM / SRAM / Flash / EEPROM)

SN74LS55D AND-OR-INVERT Gate, LS Series, Active

MPNSN74LS55D
End of Life

Texas Instruments SN74LS55D AND-OR-INVERT gate, LS series, bulk package, active production.

$0.41Ref. price · indicative, final on quote
Texas Instruments SN74LS55D datasheet (PDF)
RoHSRoHS non-compliant
Series*
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74LS55D specifications
ParameterValue
Series*
PackageBulk

Product details

Device function and family fit

The SN74LS55D is an AND-OR-INVERT gate from the 74LS (low-power Schottky) series, implementing a combined AND-OR logic stage followed by inversion in a single package.

RoHS compliance flag

The SN74LS55D is marked RoHS non-compliant — the lead content in the solder finish or package body exceeds the RoHS exemption thresholds. Legacy BOMs that do not require lead-free assembly can still use this part; for lead-free lines a RoHS-compliant alternative or an approved exemption waiver is needed.

Frequently asked questions

Is SN74LS55D equivalent to 74LS55?

Yes — the SN74LS55D is Texas Instruments' prefix version of the 74LS55 AND-OR-INVERT gate. The SN prefix denotes the TI-manufactured variant; the 74LS55 functional specification is the same across JEDEC-standard vendors.

What is the function of SN74LS55D?

The SN74LS55D is an AND-OR-INVERT gate. It performs a logical AND of two or more input pairs, ORs the results, and inverts the final output — a single-gate solution for sum-of-products logic that would otherwise require separate AND, OR, and NOT stages.