Texas Instruments SN74HC175D

Overview

SN74HC175D from Texas Instruments is a quadruple positive-edge-triggered D-type flip-flop with asynchronous clear, housed in a 16-pin SOIC package. It operates across 2 V–6 V, delivers ±4 mA output drive at 5 V, exhibits 13 ns typical propagation delay, and features complementary Q/Q̅ outputs per stage-used for synchronous data latching in digital control logic and register file design.

For engineers reviewing the SN74HC175D datasheet, SN74HC175D pinout, SN74HC175D application, or SN74HC175D equivalent, key selection criteria include its 16-pin SOIC footprint, 80 μA max ICC power consumption, direct CLR functionality, and compatibility with LSTTL load driving (up to 10 units) in industrial timing and storage register implementations.

Technical Context

The SN74HC175D implements four independent D-type flip-flops sharing a common clock (CLK) and active-low asynchronous clear (CLR) input. Each stage provides true and complement outputs (Q and Q̅), enabling direct implementation of toggle, latch, and storage functions without external inversion.

It uses standard CMOS silicon process technology, supports rail-to-rail input voltage thresholds (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V), and meets JEDEC JESD78 Class II latch-up immunity. Timing is defined relative to CLK ↑ edge, with setup time (tsu) of 25 ns and pulse width (tw) of 20 ns minimum at 4.5 V.

Key Specifications

Pinout & Package

SN74HC175D is supplied in a 16-pin Small Outline Integrated Circuit (SOIC) 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 or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC175D, SN74HC174D trades complementary outputs for higher channel count, while 74LVC175PW sacrifices 5 V compatibility for faster switching and lower dynamic power in 3.3 V domains.

Availability

SN74HC175D is available at Aetrix Electronics and suitable for industrial control panels, programmable logic modules, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC175D 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 and embedded processing technologies with broad manufacturing scale and automotive-grade qualification capabilities.

The SN74HC175D belongs to TI's legacy 74HC logic family, designed for general-purpose digital interfacing, register storage, and clocked control functions in cost-sensitive industrial and consumer electronics.

FAQ

What is the maximum clock frequency supported by SN74HC175D?

The SN74HC175D supports up to 29 MHz maximum clock frequency under worst-case conditions (VCC = 6 V, TA = 85 °C). At 4.5 V and 25 °C, fmax reaches 25 MHz. These values derive from measured tpd and timing margins in the official TI datasheet SCLS299F, and reflect guaranteed operation-not typical performance. Always validate timing closure in your specific layout and loading conditions when targeting >10 MHz.

Does SN74HC175D have built-in ESD protection?

Yes, SN74HC175D incorporates standard CMOS input protection diodes rated for ±20 mA clamp current per I/O pin, compliant with JEDEC JS-001 Class 2 (2 kV HBM). However, TI explicitly cautions that ESD damage remains possible during handling-especially with floating inputs-so proper grounding, anti-static workstations, and input termination per SCBA004 are required to ensure reliability in production environments.

Can SN74HC175D drive LEDs directly?

SN74HC175D can sink or source up to ±4 mA per output at 5 V, which is sufficient for low-current indicator LEDs (e.g., 2 mA @ 1.8 V forward drop with 1.5 kΩ series resistor). However, it lacks current regulation or thermal foldback, so continuous DC drive of multiple LEDs may exceed total package power limits (Pd ≈ 250 mW max). For robust LED control, use dedicated driver ICs or discrete transistors.

Is SN74HC175D pin-compatible with SN74LS175N?

No, SN74HC175D is not pin-compatible with SN74LS175N. Although both are 16-pin DIP/SOIC quad D-flip-flops with identical pin numbering for CLK, CLR, D, Q, and Q̅ signals, the LS version has different output structure (open-collector capable) and incompatible DC specs (e.g., VIL/VIL thresholds, output voltage swing). Direct substitution risks logic misinterpretation and excessive loading-always verify interface compatibility per signal level and fanout requirements.

What is the recommended bypass capacitor for SN74HC175D?

Texas Instruments recommends a 0.1 μF ceramic capacitor placed as close as possible between VCC (Pin 16) and GND (Pin 8) to suppress high-frequency supply noise. For mixed-signal systems, paralleling with a 1 μF tantalum or ceramic capacitor improves low-frequency decoupling. Layout best practice mandates shortest possible trace lengths (<5 mm) and direct connection to ground plane vias to maintain impedance below 1 Ω at 100 MHz.