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Texas Instruments 54LS279LMQB — Logic ICs
Texas Instruments

54LS279LMQB 54LS TTL R-S Latch, Active, Bulk

MPN54LS279LMQB
End of Life

54LS279LMQB, 54LS TTL family, 1-bit R-S latch, TTL logic, Bulk package, active lifecycle.

$3.5Ref. price · indicative, final on quote
54LS279LMQB datasheet
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

54LS279LMQB Technical Specifications
ParameterValue
Series*
PackageBulk

Product details

Device identity and logic family

The 54LS279LMQB is a 1-bit R-S latch implemented in low-power Schottky TTL, part of the 54LS series intended for extended-temperature-range applications. It performs the basic set-reset latch function common in control logic, debounce circuits, and register storage where a single-bit memory element is needed.

Lifecycle and supply posture

For a legacy TTL family part, active status is notable — it indicates ongoing manufacturing support rather than a last-time-buy or end-of-life phase.

Package and handling note

Bulk shipment means the parts are not pre-taped for automated placement; plan for hand-insertion or tube-fed assembly. No reel or tape dimensions apply.

Frequently asked questions

Is 54LS279LMQB equivalent to 74LS279?

Functionally, the 54LS279 and 74LS279 are the same 1-bit R-S latch logic. The 54LS279LMQB is the 54LS variant, suitable for extended-temperature environments.

What is the difference between 54LS279 and 74LS279?

The 54LS suffix 'LMQB' indicates a specific package and screening level. For most commercial designs, the 74LS279 is the cost-effective choice; the 54LS279 is used where extended temperature or military-grade reliability is required.