Texas Instruments SN74HC175DT

Overview

SN74HC175DT from Texas Instruments is a quadruple positive-edge-triggered D-type flip-flop with individual complementary Q and Q̅ outputs and a shared asynchronous clear (CLR) input. It operates across 2 V to 6 V, delivers ±4 mA output drive at 5 V, exhibits typical propagation delay of 13 ns, and supports clock frequencies up to 25 MHz at 5 V - enabling reliable data latching in synchronous digital control logic for industrial PLC modules.

For engineers reviewing the SN74HC175DT datasheet, SN74HC175DT pinout, SN74HC175DT application, or SN74HC175DT equivalent, this page provides verified functional behavior, package-specific terminal mapping, timing-critical design values, and validated alternative options for buffer/register-level logic replacement in legacy-compatible 16-pin SOIC designs.

Technical Context

The SN74HC175DT implements four independent edge-triggered storage elements, each with dual-rail outputs and a common active-low CLR signal. Its CMOS architecture ensures low static current (≤80 μA ICC max) and high noise immunity, with input thresholds defined relative to VCC (VIH = 3.15 V min at 4.5 V).

Timing behavior is strictly governed by setup (tsu = 25 ns min at 4.5 V), hold (th = 0 ns), and propagation delay (tpd = 32 ns max at 4.5 V, CL = 50 pF). All unused inputs must be tied to VCC or GND to prevent floating states and unintended switching.

Key Specifications

Pinout & Package

SN74HC175DT is supplied in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is located at the top-left corner adjacent to the index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC175DT, SN74HC175DR offers identical performance in a RoHS-compliant, surface-mount format ideal for automated assembly, while 74HC175N provides through-hole compatibility at the cost of thermal efficiency and board area - making SN74HC175DT optimal for volume SOIC-based industrial control designs requiring legacy footprint continuity.

Availability

SN74HC175DT is available at Aetrix Electronics and suitable for industrial control logic, digital pattern generation, and legacy system interface applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74HC175DT 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 logic ICs, with leadership in industrial, automotive, and embedded processing technologies.

The SN74HC175DT belongs to TI's 74HC high-speed CMOS logic family, designed for low-power, wide-voltage-range digital interfacing and data storage in commercial and industrial systems.

FAQ

What is the maximum clock frequency supported by SN74HC175DT?

The SN74HC175DT supports a maximum clock frequency of 25 MHz at VCC = 4.5 V and TA = 25 °C, as specified in the switching characteristics table. At 6 V, fmax reaches 29 MHz under the same conditions. Real-world operation should account for temperature derating and load capacitance - CL > 50 pF reduces achievable frequency.

Does SN74HC175DT have true complementary outputs?

Yes, SN74HC175DT provides true complementary Q and Q̅ outputs for each of its four flip-flops. These are internally generated, not inverted externally, ensuring matched propagation delays and precise phase opposition - critical for applications like differential bus driving or synchronous toggling.

Can SN74HC175DT operate at 3.3 V supply?

Yes, SN74HC175DT is fully specified for operation at 3.3 V (within its 2 V to 6 V range). At 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤1.09 V, providing robust noise margins. Output drive is reduced to ±2.6 mA typical, sufficient for driving modern 3.3 V logic inputs.

What is the purpose of the CLR pin on SN74HC175DT?

The CLR (pin 1) is an asynchronous active-low clear input that forces all four Q outputs low immediately, independent of the clock signal. It overrides current D inputs and stored states, enabling system-wide reset or fault recovery without waiting for a clock edge - essential for safety-critical initialization sequences.

Is SN74HC175DT pin-compatible with older 74LS175 devices?

Yes, SN74HC175DT uses the same 16-pin SOIC footprint and pin assignment as 74LS175, including identical D, Q, Q̅, CLK, and CLR locations. However, it requires no external pull-ups and draws significantly less current - making it a direct drop-in replacement with improved power efficiency and voltage flexibility.