Texas Instruments SN74LV74APWT

Overview

SN74LV74APWT from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC designed for 2-V to 5.5-V operation, featuring 8.5 ns maximum propagation delay at 5 V, Ioff partial-power-down support, and mixed-mode voltage interface capability. It implements two independent D-flip-flops with asynchronous preset (PRE) and clear (CLR), used in digital logic synchronization, clock domain crossing, and state-holding circuits within industrial PLCs and server motherboard control planes.

For engineers reviewing the SN74LV74APWT datasheet, SN74LV74APWT pinout, SN74LV74APWT application, or SN74LV74APWT equivalent, this page delivers verified functional specifications, validated TSSOP-14 pin mapping, confirmed timing behavior across 2.5 V/3.3 V/5 V rails, and real-world implementation guidance for bus interface and data latching use cases.

Technical Context

This device operates as a dual, edge-triggered storage element where each flip-flop responds only on the rising edge of its dedicated clock input (1CLK/2CLK), while asynchronous PRE and CLR inputs override clocked behavior to force Q/Q outputs to defined states. Its CMOS architecture enables rail-to-rail output swing, low dynamic ground bounce (<0.8 V at 3.3 V), and VOH undershoot >2.3 V - critical for signal integrity in mixed-voltage systems.

The Ioff feature disables outputs during power-down, preventing backflow current when VCC = 0 V, and overvoltage-tolerant inputs accept up to 5.5 V regardless of supply voltage - enabling level translation from higher-voltage logic domains into 2.5 V or 3.3 V subsystems without external buffers.

Key Specifications

Pinout & Package

TSSOP-14 package (5.00 mm × 4.40 mm body size), lead-free, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV74APWT, SN74LV74ADR offers mechanical compatibility with legacy SOIC designs but sacrifices board-area efficiency, while SN74LV74APWR delivers identical functionality in the same compact TSSOP package with guaranteed availability and optimized logistics for SMT lines.

Availability

SN74LV74APWT is available at Aetrix Electronics and suitable for programmable logic controllers, server motherboards, and distributed control systems requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74LV74APWT 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 specializing in analog, embedded processing, and logic technologies, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LV74A family delivers low-voltage, high-speed dual D-flip-flops optimized for mixed-signal system interfacing, power-aware design, and robust operation across extended temperature ranges in mission-critical infrastructure.

FAQ

What is the operating voltage range for SN74LV74APWT?

The SN74LV74APWT operates from 2 V to 5.5 V on VCC, supporting interoperability across 2.5 V, 3.3 V, and 5 V logic families. Its inputs tolerate up to 5.5 V regardless of supply voltage, enabling down-translation without external level shifters. This range is validated across –40°C to +125°C ambient temperature per TI's SCLS381M datasheet.

Does SN74LV74APWT support partial power-down functionality?

Yes, SN74LV74APWT includes Ioff circuitry that disables outputs when VCC = 0 V, preventing backflow current during power sequencing or hot-swap events. This feature is explicitly documented in the Features section and Electrical Characteristics table of the SN74LV74A datasheet (SCLS381M), making SN74LV74APWT suitable for systems with multi-rail power domains.

What is the maximum clock frequency supported by SN74LV74APWT at 3.3 V?

At VCC = 3.3 V ± 0.3 V and CL = 15 pF, SN74LV74APWT supports a maximum clock frequency (fmax) of 140 MHz (typical) and 70 MHz (min) over –40°C to +125°C. These values are specified in Section 6.6 of the SCLS381M datasheet and reflect guaranteed timing performance under industrial temperature conditions.

How does SN74LV74APWT handle asynchronous preset and clear inputs?

SN74LV74APWT features active-low asynchronous PRE and CLR inputs on each flip-flop. When asserted (low), they immediately force Q = H / Q = L (PRE) or Q = L / Q = H (CLR), overriding clock and data inputs. This behavior is defined in the Function Table (Section 8.4) and remains valid across the full 2–5.5 V VCC range and –40°C to +125°C operating temperature.

Is SN74LV74APWT pin-compatible with other packages in the SN74LV74A family?

Yes, all SN74LV74A variants - including SN74LV74APWT (TSSOP), SN74LV74ADR (SOIC), SN74LV74ADBR (SSOP), and SN74LV74ARGYR (VQFN) - share identical pin functions and numbering per the Pin Configuration diagram (Section 5). Mechanical dimensions differ, but electrical interface and logic behavior are fully consistent across packages.