Texas Instruments SN74HC175PW

Overview

SN74HC175PW 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, operating across 2 V to 6 V supply range. It delivers 13 ns typical propagation delay at 6 V, ±4-mA output drive, and low 80-μA max ICC, enabling reliable data latching in synchronous digital logic systems such as register files and pattern generators.

For engineers reviewing the SN74HC175PW datasheet, SN74HC175PW pinout, SN74HC175PW application, or SN74HC175PW equivalent, key selection criteria include its TSSOP-16 package footprint, 16-pin dual-rail output configuration, wide 2–6 V VCC compatibility, and guaranteed timing performance down to –40°C ambient.

Technical Context

The SN74HC175PW implements four independent edge-triggered D flip-flops sharing one active-low asynchronous CLR signal. Each stage features true and complement outputs (Q, Q̅), enabling direct implementation of toggle, latch, and storage functions without external inverters.

Its CMOS design ensures rail-to-rail output swing, low input current (≤1 μA), and compatibility with LSTTL loads (up to 10 units). Timing behavior is defined by setup time (21 ns min at 6 V), hold time (0 ns), and propagation delay (32 ns max at 6 V), all specified under CL = 50 pF load conditions.

Key Specifications

Pinout & Package

TSSOP-16 package: 5.00 mm × 4.40 mm body, 0.65 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant. Pin 1 marked via index area; pin 1 quadrant Q1 per tape-and-reel specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC175PW, SN74HC174PW offers more flip-flops but sacrifices dual-rail convenience, while SN74LVC175PW trades 5 V tolerance for speed and drive strength - making SN74HC175PW optimal for mixed-voltage industrial control where robustness and simplicity matter most.

Availability

SN74HC175PW is available at Aetrix Electronics and suitable for industrial control panels, test equipment register banks, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC175PW 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 delivering analog, embedded processing, and logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74HC175PW belongs to TI's 74HC logic family, designed specifically for high-noise-immunity, low-power, pin-compatible replacements of legacy TTL devices in industrial and instrumentation applications.

FAQ

What is the maximum clock frequency supported by the SN74HC175PW?

The SN74HC175PW supports up to 25 MHz maximum clock frequency at 6 V supply, derived from its 32 ns maximum propagation delay (tpd) and timing requirements specified in the datasheet. This limit ensures reliable setup and hold timing margins across the full –40°C to +85°C operating range. The SN74HC175PW maintains functional integrity at lower frequencies including DC, supporting static register applications.

Does the SN74HC175PW have true and complement outputs on each flip-flop?

Yes, the SN74HC175PW provides both Q and Q̅ outputs for each of its four D-type flip-flops. This dual-rail capability is explicitly confirmed in the device description, functional block diagram, and pinout documentation. The presence of dedicated Q̅ pins (pins 4, 7, 9, 12) eliminates the need for external inverters in applications requiring inverted logic states, such as differential bus driving or toggle-mode operation.

Is the SN74HC175PW 5 V tolerant when operated at 3.3 V supply?

No, the SN74HC175PW is not 5 V tolerant on inputs when powered at 3.3 V. Its absolute maximum input voltage is VCC + 0.5 V, meaning at 3.3 V supply, inputs must remain ≤3.8 V. Applying 5 V signals risks violating absolute maximum ratings and may cause damage. For mixed-voltage interfacing, level-shifting circuitry or a 5 V-supplied SN74HC175PW variant is required.

What is the recommended bypass capacitor for the SN74HC175PW?

Texas Instruments recommends a 0.1-μF ceramic bypass capacitor placed as close as possible to the VCC (pin 16) and GND (pin 8) pins of the SN74HC175PW. This minimizes high-frequency supply noise and prevents logic glitches during switching transients. For enhanced noise rejection, a parallel 1-μF capacitor may be added, but the 0.1-μF unit remains mandatory per TI's layout guidelines in the SN74HC175PW datasheet.

Can unused inputs on the SN74HC175PW be left floating?

No, unused inputs on the SN74HC175PW must never be left floating. All unused D, CLK, and CLR inputs must be tied to a valid logic level - either VCC or GND - to prevent undefined output states, increased power consumption, and potential oscillation. This requirement is explicitly stated in Section 6.2 of the datasheet and applies to all CMOS logic devices, including the SN74HC175PW.