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Texas Instruments SN74HC27DT — Logic ICs

SN74HC27DT NOR Gate, 3-CH 3-Inp, 14-SOIC, 74HC Series

MPNSN74HC27DT
End of Life

Texas Instruments 74HC series SN74HC27DT, triple 3-input NOR gate, 14-SOIC (0.154", 3.90 mm width), 2 V to 6 V supply, -40°C to 85°C, 15 ns max propagation delay at 6 V, 50 pF.

$1.16Ref. price · indicative, final on quote
Texas Instruments SN74HC27DT datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74HC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HC27DT specifications
ParameterValue
Series74HC
Logic typeNOR Gate
MountingSurface Mount
Supply voltage2V ~ 6V
Current - quiescent2 µA
Current - output high, low5.2mA, 5.2mA
I/O channels3
Operating temperature-40°C ~ 85°C
PackageTape & Reel (TR); Cut Tape (CT)
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits3
Input logic level - low0.5V ~ 1.8V
Input logic level - high1.5V ~ 4.2V
Max propagation delay @ v, max CL15ns @ 6V, 50pF

Product details

Triple 3-input NOR gate in 14-SOIC — 74HC logic family

It integrates three independent NOR gates, each with three inputs, in a compact 14-SOIC surface-mount package. The 2 V to 6 V supply range makes it compatible with 3.3 V and 5 V logic rails, and the -40°C to 85°C operating temperature covers industrial environments. Quiescent current maxes at 2 µA, suiting battery-powered or always-on glue logic.

At 6 V supply and 50 pF load, the maximum propagation delay is 15 ns. For a 5 V rail, the delay will be slightly higher — budget around 20 ns typical. This is fast enough for most board-level decode, enable, and gating functions running below 20 MHz. If your clock or data path needs tighter than 10 ns, step to the 74LVC or 74AUC families. The 5.2 mA output drive (both high and low) is adequate for driving a few CMOS inputs or a single LED; it won't drive a relay coil or a long backplane trace.

Frequently asked questions

What is the difference between SN74HC27DT and SN74HC27D?

The difference is the packaging and reel format. SN74HC27DT is supplied in Tape & Reel (TR) and Cut Tape (CT) options, while SN74HC27D typically comes in tubes or other packaging. The silicon, logic function, and pinout are identical. Both are triple 3-input NOR gates in 14-SOIC, with the same 2 V to 6 V supply range and -40°C to 85°C temperature grade.

Is SN74HC27DT compatible with 3.3V logic?

Yes, the 2 V to 6 V supply range includes 3.3 V. At 3.3 V, the input logic low threshold is 0.5 V to 1.8 V, and the high threshold is 1.5 V to 4.2 V. A 3.3 V CMOS output driving a 3.3 V rail will meet the high-level input requirement. Propagation delay will be slightly longer than the 15 ns at 6 V — expect about 25 ns at 3.3 V and 50 pF.