Texas Instruments SN74LVC74AQDREP

Overview

SN74LVC74AQDREP from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent clear and preset inputs, designed for 2 V to 3.6 V operation. It delivers 5.2 ns max propagation delay at 3.3 V, supports mixed-voltage interfacing (inputs accept up to 5.5 V), and operates across –40°C to 125°C for industrial and extended-temperature applications.

For engineers reviewing the SN74LVC74AQDREP datasheet, SN74LVC74AQDREP pinout, SN74LVC74AQDREP application, or SN74LVC74AQDREP equivalent, key selection criteria include setup/hold timing (tsu = 2.2 ns, th = 1 ns at 3.3 V), rail-to-rail output swing, low ground bounce (<0.8 V), and SOIC-14 packaging for legacy board compatibility.

Technical Context

The SN74LVC74AQDREP implements two independent edge-triggered D flip-flops in a single SOIC-14 package, each with asynchronous active-low clear (CLR) and preset (PRE) inputs that override clocked data transfer. Its CMOS LVC logic family ensures TTL-compatible thresholds and 5.5 V-tolerant inputs, enabling direct interface with both 3.3 V and 5 V signal sources without level-shifting circuitry.

Timing behavior is defined by precise setup (2.2 ns min) and hold (1 ns min) requirements relative to the positive clock edge, with propagation delays (tpd ≤ 5.2 ns) measured under 3.3 V supply conditions. The device maintains functional stability across its full –40°C to 125°C operating range, validated per JEDEC extended-temperature qualification standards.

Key Specifications

Pinout & Package

SN74LVC74AQDREP is housed in a 14-pin SOIC (D) package with 1.27 mm pitch, 8.75 mm × 3.91 mm body, and 1.75 mm max height. Pin 1 is located at the top-left corner with notch or beveled edge marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC74AQDREP, SN74LVC74AQPWREP offers identical functionality in a smaller TSSOP package for space-constrained designs, while SN74LVC74AMDREP extends low-temperature operation to –55°C for harsh-environment applications-neither is pin-compatible without layout revision due to differing package outlines.

Availability

SN74LVC74AQDREP is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC74AQDREP 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 devices, with decades of experience in high-reliability industrial and automotive solutions.

The SN74LVC74AQDREP belongs to TI's enhanced-product (EP) logic portfolio, engineered for extended-temperature operation and diminished manufacturing source (DMS) continuity-targeting mission-critical industrial control and avionics applications.

FAQ

What is the maximum clock frequency supported by the SN74LVC74AQDREP?

The SN74LVC74AQDREP supports a maximum clock frequency of 100 MHz at VCC = 3.3 V, as specified in its timing characteristics table. This is derived from the minimum clock pulse width (tw = 3.3 ns) and verified under recommended operating conditions. Actual achievable frequency depends on board layout, load capacitance, and signal integrity-designers should validate timing margins using the 5.2 ns max tpd and 2.2 ns setup requirement in their specific application.

Does the SN74LVC74AQDREP require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs of the SN74LVC74AQDREP must be held at a valid logic level-either VCC or GND-to prevent floating nodes that could cause excessive current draw, logic instability, or increased EMI. TI explicitly recommends this in the Absolute Maximum Ratings section and references application report SCBA004 for implementation guidance. Leaving inputs unconnected violates recommended operating conditions and may compromise device reliability.

Can the SN74LVC74AQDREP operate reliably at 2.5 V supply voltage?

Yes, the SN74LVC74AQDREP is fully specified to operate from 2 V to 3.6 V, including 2.5 V. Electrical characteristics such as VOH (min 2.2 V), VOL (max 0.55 V), and tpd (5.2 ns typical) are guaranteed across this entire range. At 2.5 V, the maximum clock frequency reduces to 83 MHz, and setup time increases slightly to 3.4 ns-values confirmed in the Timing Requirements table of the official datasheet.

What is the meaning of the "Q" suffix in SN74LVC74AQDREP?

The "Q" suffix in SN74LVC74AQDREP denotes qualification for the extended industrial temperature range of –40°C to 125°C. This distinguishes it from the "M" suffix variant (e.g., SN74LVC74AMDREP), which is rated for –55°C to 125°C and intended for military/aerospace applications. Both variants share identical logic functionality, timing, and electrical specs within their respective temperature bounds.

Is the SN74LVC74AQDREP RoHS compliant and lead-free?

Yes, the SN74LVC74AQDREP is RoHS compliant and features a lead-free NIPDAU (nickel/palladium/gold) terminal finish, as documented in TI's Package Option Addendum. It carries a Moisture Sensitivity Level (MSL) rating of Level-1 at 260°C peak reflow, indicating unlimited floor life when stored per J-STD-020 guidelines. Full compliance documentation, including material declarations, is available through TI's Quality & Environmental page.