Texas Instruments SN74175N

Overview

SN74175N from Texas Instruments is a quadruple D-type flip-flop with asynchronous clear, implemented in bipolar TTL logic, housed in a 16-pin PDIP package. It operates over 0°C to 70°C, features 10 ns typical propagation delay (t_PLH/t_PHL), supports 8 mA output drive, and is used in synchronous data latching and register staging within legacy industrial control logic.

For engineers reviewing the SN74175N datasheet, SN74175N pinout, SN74175N application, or SN74175N equivalent, key selection considerations include its TTL-compatible input thresholds, single active-low asynchronous clear per stage, non-inverting Q outputs, and compatibility with 5 V ±5% supply rails in discrete logic systems requiring deterministic edge-triggered storage.

Technical Context

The SN74175N implements four independent edge-triggered D-type flip-flops sharing a common clock and individual asynchronous clear inputs. Each stage samples the D input on the rising edge of CLK and updates Q on that edge, while CLR overrides state asynchronously when low.

It uses standard bipolar TTL circuitry-no Schottky clamping-resulting in higher power consumption (24 mW typical per flip-flop) and slower speed than LS variants, but with robust noise immunity and direct compatibility with legacy 7400-series logic families.

Key Specifications

Pinout & Package

SN74175N is supplied in a 16-pin plastic dual in-line package (PDIP-N), 0.3-inch body width, with standard through-hole mounting and 0.1-inch pin pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74175N, SN74LS175N offers superior power efficiency and adequate speed for most commercial logic, while SN74S175N delivers critical timing headroom at the cost of significantly higher supply current and thermal output - making SN74175N the optimal choice for cost-sensitive, thermally constrained, or legacy-replacement applications requiring strict original-spec compliance.

Availability

SN74175N is available at Aetrix Electronics and suitable for industrial control sequencing, legacy test equipment refurbishment, and discrete CPU register file construction requiring stable component supply and long-term obsolescence support.

Supply support for SN74175N 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 ICs with broad industrial and aerospace heritage.

The SN74175N belongs to TI's original 7400-series TTL logic family, designed in the early 1970s for modular, breadboard-friendly digital system building using discrete logic blocks rather than microcontrollers.

FAQ

What logic family does SN74175N belong to, and how does it differ from SN74LS175N?

SN74175N belongs to the standard bipolar TTL family, not low-power Schottky (LS) or Schottky (S). It draws more current (24 mW per flip-flop vs. 2 mW for SN74LS175N) and has slower propagation (10 ns vs. 15 ns max), but maintains full pin and functional compatibility with SN74175N. Its higher noise margin and robustness make it preferred in noisy industrial environments where LS variants may misfire.

Does SN74175N support common-clock, individual-clear operation?

Yes. SN74175N uses a single shared CLK input (pin 14) for all four D-type flip-flops and provides four dedicated active-low asynchronous clear inputs (pins 8, 9, 11, 12), one per stage. This architecture allows precise, independent reset of any bit without affecting others - a key requirement in register files and custom counters where partial initialization is needed.

What are the absolute maximum ratings for SN74175N supply voltage and operating temperature?

The absolute maximum supply voltage for SN74175N is 5.5 V DC, and the maximum operating junction temperature is 150°C. However, the device is specified for reliable operation only within V_CC = 4.75 V to 5.25 V and ambient temperature 0°C to +70°C. Exceeding these limits risks parametric shift, accelerated aging, or permanent damage - especially since SN74175N lacks internal thermal shutdown.

Can SN74175N be used with modern 3.3 V logic systems?

No. SN74175N is strictly a 5 V TTL device with input thresholds referenced to 5 V (V_IH ≥ 2.0 V, V_IL ≤ 0.8 V). Driving it from 3.3 V logic may result in marginal or failed high-level recognition. Interfacing requires level translation - e.g., a 3.3 V-to-5 V buffer such as SN74LVC4245A - or redesign using 3.3 V-compatible alternatives like SN74LVC175A.

Is SN74175N still in active production, and what packaging options are available?

Yes, SN74175N remains in active production per TI's Package Option Addendum, offered exclusively in the 16-pin PDIP (N) package with 25-unit tube packaging. RoHS-compliant (NIPDAU lead finish), it carries an operating temperature range of 0°C to +70°C and part marking "SN74175N". No SOIC or surface-mount variants exist for the standard TTL version - only for LS and S derivatives.