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Texas Instruments 74S174PCQR — Logic ICs

74S174PCQR D Flip-Flop, S Series TTL, Active, Bulk

MPN74S174PCQR
End of Life

74S174PCQR, S Series TTL D flip-flop, active lifecycle, RoHS non-compliant, bulk packaging.

$0.68Ref. price · indicative, final on quote
Texas Instruments 74S174PCQR datasheet (PDF)
RoHSRoHS non-compliant
Series*
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

74S174PCQR specifications
ParameterValue
Series*
PackageBulk

Product details

The 74S174PCQR is a D flip-flop in the S Series TTL logic family, designed for high-speed clocked storage in legacy digital systems. It is commonly used in counters, shift registers, and state-machine logic where the Schottky-clamped TTL process provides faster propagation than the standard 74LS series. The part is RoHS non-compliant, which means it is intended for repair, maintenance, or exempt-production runs where leaded solder is still permitted. For new designs requiring RoHS compliance, a 74ACT or 74AC equivalent should be evaluated.

Because this is a legacy TTL part, availability may vary by distributor inventory depth.

Supplied in bulk packaging, the 74S174PCQR is a through-hole device — typically a 16-pin DIP — suited for prototyping, rework, or low-volume production where tape-and-reel is not required. Bulk format also simplifies kitting for MRO and repair depots.

Frequently asked questions

Is 74S174PCQR RoHS compliant?

No, the 74S174PCQR is RoHS non-compliant. It contains lead and is intended for legacy or exempt applications where leaded solder is permitted.

What is the function of 74S174PCQR?

The 74S174PCQR is a D flip-flop in the S Series TTL logic family. It stores one bit of data per flip-flop and is used in clocked digital circuits such as registers, counters, and state machines.

What is the replacement for 74S174PCQR?

There is no direct official replacement listed for the 74S174PCQR. For a functionally similar part, the 74S175PC is a quad D flip-flop in the same S Series TTL family, though it has a different pinout (hex vs quad). For RoHS-compliant designs, consider a 74ACT or 74AC equivalent.

Is 74S174PCQR equivalent to 74LS174?

The 74S174PCQR is from the S Series TTL family, which offers faster propagation delays than the 74LS174 (Low-Power Schottky). They are functionally similar D flip-flops but differ in speed and power consumption. The S Series typically draws more supply current. Pinout compatibility should be verified against the respective datasheets.