The SN74HCS27PWR is a triple 3-input NOR gate from TI's 74HCS logic family, packing three independent NOR circuits into a 14-TSSOP package. Each of the three gates accepts three inputs and delivers a standard NOR output, but the key feature here is the Schmitt-trigger action on every input — it cleans up slow, noisy, or non-monotonic edges before the gate switches. That makes this part a natural fit for industrial control boards, motor-drive interface logic, or any 3.3V or 5V backplane where signal integrity is marginal and a plain gate would oscillate or double-clock.
SN74HCS27PWR NOR Gate, Triple 3-Input, Schmitt Trigger
MPNSN74HCS27PWR
End of Life
Texas Instruments 74HCS series NOR Gate, SN74HCS27PWR, 3 Circuits, 3-Input, 2V to 6V Supply, 7.8mA Output, 12ns @ 6V, 50pF, -40°C to 125°C, 14-TSSOP.
$0.37Ref. price · indicative, final on quote
Packaging14-TSSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Series74HCS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Series | 74HCS |
| Logic type | NOR Gate |
| Mounting | Surface Mount |
| Supply voltage | 2V ~ 6V |
| Current - quiescent | 2 µA |
| Current - output high, low | 7.8mA, 7.8mA |
| I/O channels | 3 |
| Operating temperature | -40°C ~ 125°C (TA) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Features | Schmitt Trigger Input |
| Case | 14-TSSOP (0.173\", 4.40mm Width) |
| Number of circuits | 3 |
| Input logic level - low | 1V ~ 3V |
| Input logic level - high | 1.5V ~ 4.2V |
| Max propagation delay @ v, max CL | 12ns @ 6V, 50pF |
Product details
Frequently asked questions
Does SN74HCS27PWR have Schmitt trigger inputs?
Yes, all three inputs on each of the three NOR gates include Schmitt-trigger hysteresis, making the part tolerant of slow or noisy edges.
Can SN74HCS27PWR be used as a replacement for 74HCS27?
The SN74HCS27PWR is the Tape & Reel variant of the 74HCS27 triple 3-input NOR gate in a 14-TSSOP package. Functionally identical; the suffix PWR indicates the reeled packaging format.
Is SN74HCS27PWR compatible with 5V logic?
Yes, its 2V to 6V supply range covers 5V operation directly. Input logic thresholds scale with supply — at 5V the low threshold is about 1.5V to 2.5V, the high threshold about 2.5V to 3.5V, so it interfaces cleanly with 5V CMOS and TTL families.