Texas Instruments SN74HCT374PWT

Overview

SN74HCT374PWT from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, operating at 4.5 V to 5.5 V supply voltage, delivering ±6-mA output drive at 5 V, and achieving typical propagation delay of 22 ns. It functions as a bus-oriented register in digital systems requiring parallel data latching and bidirectional bus isolation.

For engineers reviewing the SN74HCT374PWT datasheet, SN74HCT374PWT pinout, SN74HCT374PWT application, or SN74HCT374PWT equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional timing behavior, and real-world implementation guidance for I/O port buffering and bus driving applications.

Technical Context

The SN74HCT374PWT implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with each Q output reflecting the corresponding D input state at clock transition. Its 3-state outputs are controlled by a shared OE input, enabling high-impedance mode without affecting internal latch states.

This device uses HCT logic family architecture-TTL-compatible inputs with CMOS-level power efficiency-supporting direct interfacing with legacy TTL systems while maintaining low ICC (≤80 μA) and high noise immunity (VIH = 2.0 V min, VIL = 0.8 V max).

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.50 mm × 4.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Compared with SN74HCT574PWR and 74ACT374PW, the SN74HCT374PWT provides the best balance of low power, TTL compatibility, and simple global 3-state control - making it ideal for general-purpose bus buffering where per-bit enable flexibility or extreme speed are not required.

Availability

SN74HCT374PWT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system bus interface, embedded display controller buffering, and ATE data capture requiring stable component supply and long-term production continuity.

Supply support for SN74HCT374PWT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with over 50 years of leadership in industrial and automotive-grade logic ICs.

The SN74HCT374PWT belongs to TI's HCT logic family, designed specifically for interoperability between TTL and CMOS systems while delivering low power consumption and robust noise immunity in harsh industrial environments.

FAQ

What is the recommended operating voltage range for SN74HCT374PWT?

The SN74HCT374PWT operates reliably across 4.5 V to 5.5 V. This range accommodates nominal 5-V systems while tolerating supply variations common in industrial power rails. Operation outside this range may cause undefined behavior or permanent damage, as specified in the absolute maximum ratings table of the official datasheet.

Does SN74HCT374PWT support hot-swapping or dynamic bus arbitration?

Yes, the SN74HCT374PWT supports dynamic bus arbitration via its active-low OE input. When OE is high, all eight Q outputs enter high-impedance mode without altering internal latch states - enabling safe insertion/removal of peripheral modules or time-multiplexed access to shared data buses.

Can SN74HCT374PWT directly drive standard TTL loads?

Yes, the SN74HCT374PWT can drive up to 15 LSTTL loads per output due to its ±6-mA drive strength at 5 V. Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) also allow direct connection to 74LS and 74ALS families without level-shifting components.

What is the maximum clock frequency supported by SN74HCT374PWT?

The SN74HCT374PWT supports up to 25 MHz at VCC = 5.5 V and TA = 25°C, based on its minimum clock pulse width (tw = 18 ns) and setup/hold timing requirements. Real-world operation at full speed requires proper PCB layout, decoupling, and load capacitance ≤50 pF.

Is SN74HCT374PWT pin-compatible with other TSSOP-20 octal flip-flops?

SN74HCT374PWT is pin-compatible with SN74HCT574PWR and SN74ACT374PW in the same TSSOP-20 package, sharing identical pin assignments for D, Q, CLK, OE, VCC, and GND. However, functional differences - such as OE granularity or AC characteristics - require verification before substitution.