Texas Instruments SN74HC174PWRG4

Overview

SN74HC174PWRG4 from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with shared clock and asynchronous clear, operating across 2 V to 6 V, delivering 14 ns typical propagation delay, ±4 mA output drive at 5 V, and 80 μA max ICC-used in synchronous data latching within industrial control logic and digital instrumentation registers.

For engineers reviewing the SN74HC174PWRG4 datasheet, SN74HC174PWRG4 pinout, SN74HC174PWRG4 application, or SN74HC174PWRG4 equivalent, key selection criteria include its TSSOP-16 package footprint, 6-bit single-rail storage capability, guaranteed timing at 5 V/25 °C, and compatibility with LSTTL load driving requirements in space-constrained PCB designs.

Technical Context

The SN74HC174PWRG4 implements six independent D-type latches sharing one global CLK and one active-low CLR input, with all outputs updated synchronously on the rising edge of CLK. Its CMOS architecture ensures rail-to-rail voltage operation and low static current draw.

It supports mixed-voltage interfacing via wide VCC range (2–6 V), meets standard HC logic thresholds (VIH = 3.15 V min at VCC = 4.5 V), and maintains defined setup/hold times (tsu = 25 ns, th = 0 ns at 4.5 V) for reliable edge-triggered capture in deterministic digital systems.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm, 1.2 mm max height), lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex D-type flip-flop applications.

Compared with SN74HC174DR and 74HC174PW,118, the SN74HC174PWRG4 offers the smallest PCB area (5.0 × 4.4 mm), lowest profile (1.2 mm), and TI-specific quality assurance for long-lifecycle industrial deployments-making it optimal for high-density automated assembly where thermal margin permits.

Availability

SN74HC174PWRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital panel meter registers, test equipment pattern generation, and legacy bus interface buffering requiring stable component supply across extended production cycles.

Supply support for SN74HC174PWRG4 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 global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74HC174PWRG4 belongs to TI's 74HC logic family-designed for robust, low-power, pin-compatible replacements of legacy TTL devices in space- and power-constrained digital systems.

FAQ

What is the maximum clock frequency supported by SN74HC174PWRG4?

The SN74HC174PWRG4 supports a maximum clock frequency of 25 MHz at VCC = 4.5 V and TA = 25 °C, with fmax dropping to 21 MHz at full industrial temperature range (−40 °C to +85 °C). This is derived from its guaranteed 34 ns maximum propagation delay (tpd) and 17 ns minimum clock pulse width (tw) specifications. The actual usable frequency depends on system-level timing margins, including board trace delays and load capacitance.

Does SN74HC174PWRG4 require external pull-up resistors on the CLR pin?

Yes, SN74HC174PWRG4 requires an external pull-up resistor on the CLR pin unless actively driven low by a logic source. Because CLR is active-low and internally un-biased, leaving it floating risks unintended resets due to noise coupling. A 10 kΩ pull-up to VCC is recommended per TI application guidance to ensure stable high-state default behavior.

Can SN74HC174PWRG4 operate reliably at 3.3 V supply?

Yes, SN74HC174PWRG4 operates reliably at 3.3 V supply, meeting all AC/DC specifications across −40 °C to +85 °C. At VCC = 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤ 1.09 V, ensuring clean logic thresholds with standard 3.3 V CMOS drivers. Propagation delay increases to ~19 ns typical, remaining well within most 3.3 V system timing budgets.

How many LSTTL loads can each output of SN74HC174PWRG4 drive?

Each output of SN74HC174PWRG4 can drive up to 10 LSTTL loads, as confirmed by its ±4 mA output drive capability at VCC = 5 V and its explicit "Outputs can drive up to 10 LSTTL loads" feature statement. This assumes standard LSTTL input current (IIL = −0.4 mA, IIH = 20 μA) and accounts for worst-case voltage drop across series termination or trace impedance.

Is SN74HC174PWRG4 pin-compatible with SN74HC174PWR?

Yes, SN74HC174PWRG4 is pin-compatible with SN74HC174PWR. Both use identical TSSOP-16 (PW) packaging, share identical pinout (including CLR, CLK, D1–D6, Q1–Q6, VCC, GND), and conform to the same mechanical drawing (PW0016A). The "G4" suffix denotes green (halogen-free) packaging and RoHS compliance-no electrical or functional differences exist between the two variants.