Texas Instruments SN74F175D

Overview

SN74F175D from Texas Instruments is a quadruple positive-edge-triggered D-type flip-flop with individual buffered clock and direct asynchronous clear inputs, 16-pin SOIC package, 100 MHz maximum clock frequency, 3.2 ns typical tPLH propagation delay, and TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V), used in synchronous data latching for industrial control registers and digital test equipment.

For engineers reviewing the SN74F175D datasheet, SN74F175D pinout, SN74F175D application, or SN74F175D equivalent, this page delivers verified functional behavior, timing constraints, package-specific thermal data (θJA = 73°C/W), and real-world substitution guidance - all grounded in TI's SDFS058B revision May 2002 production datasheet.

Technical Context

This device implements four independent D-type latches using bipolar TTL circuitry, each with true and complement outputs (Q and Q̄), enabling simultaneous storage and inversion of parallel data. The direct clear (CLR) input operates asynchronously and overrides clock edge triggering, forcing both outputs to stable logic states regardless of CLK or D state.

Timing is defined by strict setup (tsu = 3 ns) and hold (th = 1 ns) requirements relative to the positive-going clock edge, with propagation delays referenced to 50% input/output voltage transitions under 50-pF load. All unused inputs must be tied to VCC or GND per TI SCBA004 to prevent floating-node-induced malfunction.

Key Specifications

Pinout & Package

SN74F175D uses a 16-pin SOIC (D) package with 1.27 mm pitch, 10.4 mm × 7.4 mm body size, and 2.00 mm max height per TI NS0016A outline. Pin 1 is marked by a beveled corner or notch on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F175D, SN74LS175N trades speed for lower power and cost in legacy systems, while SN74ACT175D offers CMOS advantages including rail-to-rail noise margin and 10× lower quiescent current - making it suitable for modern low-power upgrades without changing PCB layout.

Availability

SN74F175D is available at Aetrix Electronics and suitable for industrial control registers, digital test pattern generators, serial-to-parallel converters, and glitch-free state machine registers requiring stable component supply across long-lifecycle embedded programs.

Supply support for SN74F175D 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 founded in 1930, specializing in analog, embedded processing, and logic products with broad industrial and automotive qualification.

The SN74F175D belongs to TI's 74F TTL logic family, designed specifically for high-speed, pin-compatible replacements of legacy 74-series devices in commercial-temperature applications where robustness and timing predictability are prioritized over ultra-low power.

FAQ

What is the maximum operating frequency of the SN74F175D?

The SN74F175D supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is confirmed in the timing characteristics table of the SDFS058B datasheet and reflects the highest rate at which reliable edge-triggered data capture is guaranteed across all four flip-flops in the SN74F175D.

Does the SN74F175D support asynchronous reset, and how is it implemented?

Yes, the SN74F175D features an asynchronous direct clear (CLR) input on pin 10. When asserted low, CLR forces all four Q outputs to logic low and all Q̄ outputs to logic high immediately - independent of the clock signal or data inputs. This behavior is documented in the function table and logic diagram of the SN74F175D datasheet.

Can unused inputs on the SN74F175D be left floating?

No, unused inputs on the SN74F175D must not be left floating. Per TI application report SCBA004 and the recommended operating conditions section, all unused inputs must be tied to either VCC or GND to prevent erratic switching, increased power consumption, or potential device malfunction due to TTL input sensitivity to noise and leakage currents.

What is the thermal resistance (θJA) of the SN74F175D package?

The SN74F175D in its SOIC (D) package has a junction-to-ambient thermal resistance (θJA) of 73°C/W, as specified in the absolute maximum ratings table of the official TI datasheet. This value assumes standard JEDEC 2-layer board conditions and is essential for calculating allowable power dissipation (P = (TJmax − TA)/θJA) to maintain safe junction temperature.

Is the SN74F175D pin-compatible with other members of the 74xx175 family?

Yes, the SN74F175D shares identical pinout and logic functionality with SN74LS175N (PDIP), SN74F175N (PDIP), and SN74F175NSR (SOP), as confirmed by TI's package drawings and function tables. All variants use the same 16-pin assignment for CLK, CLR, D/Q/Q̄ signals, enabling direct physical replacement within the same package footprint family.