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Texas Instruments CY74FCT540CTQCT — Discrete Semiconductors

CY74FCT540CTQCT Buffer Inverting 3-State 20-SSOP, 5.25V

MPNCY74FCT540CTQCT
End of Life

Texas Instruments 74FCT series Buffer, Inverting, CY74FCT540CTQCT, 20-SSOP package, 4.75V-5.25V supply, 3-State output, -40°C to 85°C.

$1.47Ref. price · indicative, final on quote
Texas Instruments CY74FCT540CTQCT datasheet (PDF)
Packaging20-SSOP (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74FCT
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

CY74FCT540CTQCT specifications
ParameterValue
Series74FCT
Logic typeBuffer, Inverting
Output type3-State
MountingSurface Mount
Supply voltage4.75V ~ 5.25V
Current - output high, low32mA, 64mA
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case20-SSOP (0.154\", 3.90mm Width)
Number of elements1
Number of bits per element8

Product details

5.25V supply, 32/64 mA drive, 20-SSOP

The Texas Instruments CY74FCT540CTQCT is an 8-bit buffer with inverting logic and 3-state outputs from the 74FCT series. The single-element, 8-bit layout means one chip handles a full byte-wide data bus with a single output-enable control for the 3-state bus hold-off.

Active lifecycle and compliance baseline

For a 5V bus buffer in a control card or I/O module, this part fits without thermal derating concerns inside a ventilated enclosure.

Second-source cross-check against SN74AHCT540DGVR

The SN74AHCT540DGVR is the closest functional peer: same 8-bit inverting buffer with 3-state outputs, same 20-pin SSOP footprint. The key difference is the output drive — the 74AHCT variant delivers 8 mA typical versus the 74FCT's 32/64 mA asymmetric drive. For a lightly loaded bus (under 8 mA per line), the AHCT part is a drop-in; for higher fan-out or longer trace lengths, the FCT's stronger drive maintains signal integrity.

Sourcing posture for the BOM line

This part is sourced through authorized and independent distribution channels.

Frequently asked questions

Will CY74FCT540CTQCT drop into a board designed for SN74AHCT540DGVR?

The package footprint is the same 20-SSOP (0.154"), so the mechanical fit is identical. The supply voltage range overlaps (both are 5V logic families). The main difference is output drive: the FCT part delivers 32/64 mA versus the AHCT's 8 mA. For bus loads under 8 mA per line, it is a functional drop-in; for higher fan-out, the FCT's stronger drive is an advantage.