Texas Instruments SN74HC174PW

Overview

SN74HC174PW from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with shared clock and asynchronous clear, operating from 2 V to 6 V supply, delivering 14 ns typical propagation delay at 5 V, ±4 mA output drive, and 80 μA max ICC - used in synchronous data latching and register storage within digital control logic.

For engineers reviewing the SN74HC174PW datasheet, SN74HC174PW pinout, SN74HC174PW application, or SN74HC174PW equivalent, this page provides verified functional specifications, TSSOP-16 package details, timing behavior under 5 V operation, and validated alternative options for buffer/register design.

Technical Context

The SN74HC174PW implements six independent D-type latches sharing one global CLK and one active-low CLR input; each flip-flop transfers D-input data to Q-output on the rising edge of CLK while CLR forces Q low asynchronously. No internal feedback or preset functionality is included.

It operates strictly in CMOS logic family characteristics: rail-to-rail input thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC), low static current (<1 μA), and output drive compliant with LSTTL load standards (up to 10 units). Timing is specified across −40°C to +85°C with CL = 50 pF.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body, 0.65 mm pitch), 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar D-type register applications.

Compared with SN74HC174PW, SN74HC175PW adds Q̅ outputs but shares identical timing and packaging, while 74LVC174PW trades wider voltage tolerance for higher speed and drive in modern low-voltage systems - selection depends on output polarity requirement and target supply domain.

Availability

SN74HC174PW is available at Aetrix Electronics and suitable for industrial PLC I/O modules, digital test equipment pattern storage, and microcontroller GPIO expansion requiring stable component supply across extended temperature ranges.

Supply support for SN74HC174PW 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 and embedded processing technologies, with over 90 years of innovation in logic, power, and signal chain solutions.

The SN74HC174PW belongs to TI's industry-standard 74HC logic family, designed for general-purpose digital register and storage functions in industrial, automotive, and communications equipment where reliability and wide supply tolerance are critical.

FAQ

What is the maximum clock frequency supported by SN74HC174PW?

The SN74HC174PW supports a maximum clock frequency of 25 MHz at VCC = 5 V and TA = 25°C, based on its 14 ns typical propagation delay and specified timing margins. At VCC = 6 V, fmax reaches 29 MHz; at VCC = 2 V, it drops to 6 MHz. System-level timing must account for setup/hold requirements and board-level signal integrity.

Does SN74HC174PW provide complementary outputs (Q̅)?

No, SN74HC174PW provides only true outputs (Q1–Q6) and does not include complementary (Q̅) outputs. Each of the six D-type flip-flops has a single Q output. For designs requiring both Q and Q̅, SN74HC175PW - which offers identical pinout and timing but adds Q̅ terminals - is the direct functional alternative.

Can SN74HC174PW operate reliably at 3.3 V supply?

Yes, SN74HC174PW is fully specified for operation at 3.3 V, falling within its 2–6 V recommended supply range. At 3.3 V, it delivers ~18 ns typical propagation delay and maintains ±4 mA output drive, making it suitable for mixed-voltage systems interfacing with 3.3 V microcontrollers or FPGAs.

What is the correct power supply decoupling strategy for SN74HC174PW?

TI recommends placing a 0.1-μF ceramic capacitor between VCC (pin 16) and GND (pin 8) as close as possible to the SN74HC174PW package. For noisy environments, adding a parallel 1-μF capacitor improves low-frequency ripple suppression. Avoid long traces or vias between capacitor and pins to preserve high-frequency bypass effectiveness.

Is SN74HC174PW pin-compatible with other 74HC-series hex D flip-flops?

SN74HC174PW is pin-compatible with SN74HC175PW and SN74HC198PW in the TSSOP-16 package, sharing identical pin assignments for VCC, GND, CLK, CLR, and D/Q signals. However, functional differences exist: SN74HC175PW adds Q̅ outputs, while SN74HC198PW is an 8-bit universal shift register - verify logic function before substitution.