Texas Instruments SN74LV174APWT

Overview

SN74LV174APWT from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, designed for 2 V to 5.5 V operation. It provides six independent edge-triggered storage elements, 7.5 ns maximum propagation delay at 5 V, Ioff support for partial power-down mode, and mixed-mode voltage interface capability across all ports. It is used in LED matrix control and 7-segment display driver circuits requiring synchronized data latching.

For engineers reviewing the SN74LV174APWT datasheet, SN74LV174APWT pinout, SN74LV174APWT application, or SN74LV174APWT equivalent, key selection criteria include its 16-pin TSSOP (PW) package, 5.00 mm × 4.40 mm body size, guaranteed tpd ≤ 7.5 ns at 5 V, VCC range of 2–5.5 V, and Ioff-enabled isolation during system power sequencing.

Technical Context

The SN74LV174APWT implements six independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each stage operates on the rising edge of CLK, with data (D) sampled only when CLR is high. The device uses balanced CMOS push-pull outputs capable of sourcing/sinking up to ±12 mA at 4.5–5.5 V, and features internal clamp diodes on all inputs/outputs for ESD protection.

Its Ioff circuitry disables all outputs when VCC = 0 V, limiting leakage to ≤5 µA per terminal. Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), enabling reliable interfacing between 3.3 V logic domains and 5 V systems without level shifters.

Key Specifications

Pinout & Package

SN74LV174APWT is packaged in a 16-pin TSSOP (PW) with 5.00 mm × 4.40 mm body size, 0.65 mm pitch, and exposed pad not present. Pin 1 orientation follows Q1 quadrant assignment per TI tape-and-reel specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC174APW and 74HC174PW, the SN74LV174APWT uniquely combines Ioff-enabled power sequencing safety, 2–5.5 V operation with 5 V-tolerant inputs, and sub-8 ns speed-making it optimal for industrial control, display interfaces, and systems requiring robust mixed-voltage interoperability.

Availability

SN74LV174APWT is available at Aetrix Electronics and suitable for LED matrix control, 7-segment display driver circuits, and industrial I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LV174APWT 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, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LV174APWT belongs to TI's LV logic family, engineered for low-voltage operation with high noise immunity and power sequencing robustness in mixed-signal industrial systems.

FAQ

What is the maximum clock frequency supported by the SN74LV174APWT?

The SN74LV174APWT supports a maximum clock frequency of 110 MHz under typical conditions (VCC = 5 V, CL = 15 pF, TA = 25°C), derived from its 7.5 ns maximum propagation delay. At 3.3 V and CL = 15 pF, fmax drops to 170 MHz (typical) but is limited to 80 MHz (min) across temperature and process variation. System-level timing must account for setup/hold requirements and load capacitance.

Does the SN74LV174APWT support 3.3 V microcontroller interfacing without level shifters?

Yes, the SN74LV174APWT supports direct interfacing with 3.3 V microcontrollers: its inputs are 5 V tolerant (VI up to 5.5 V), and VIH/VIL thresholds scale with VCC (e.g., VIH = 0.7×VCC). When powered at 3.3 V, it accepts standard 3.3 V logic levels while driving compatible loads - no external level shifters are needed.

What is the purpose of the Ioff feature in the SN74LV174APWT?

The Ioff feature in the SN74LV174APWT disables all outputs and limits leakage current to ≤5 µA when VCC = 0 V. This prevents current backflow from live buses into a powered-down section of the system, enabling safe hot-swap, partial power-down, and board-level power sequencing - a critical requirement in modular industrial electronics.

Can unused inputs on the SN74LV174APWT be left floating?

No, unused inputs on the SN74LV174APWT must not be left floating. All unused D, CLK, and CLR inputs must be tied to a valid logic level (VCC or GND) per TI's recommendation. Floating inputs can cause increased ICC, erratic output behavior, or ESD susceptibility due to undefined internal node voltages.

What package type is used for the SN74LV174APWT and what are its dimensions?

The SN74LV174APWT uses a 16-pin TSSOP (PW) package with nominal body dimensions of 5.00 mm × 4.40 mm and 0.65 mm lead pitch. It is RoHS-compliant, has NIPDAU/SN lead finish, and carries a JEDEC MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH).