Texas Instruments SN74LVC74ADBRG4

Overview

SN74LVC74ADBRG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent preset and clear inputs, operating from 1.65 V to 3.6 V supply, delivering 5.2 ns propagation delay at 3.3 V, and supporting 5.5 V-tolerant inputs for mixed-voltage interfacing in digital control logic circuits.

For engineers reviewing the SN74LVC74ADBRG4 datasheet, SN74LVC74ADBRG4 pinout, SN74LVC74ADBRG4 application, or SN74LVC74ADBRG4 equivalent, this device serves as a low-voltage, high-speed storage element in clock-synchronized state machines, frequency dividers, and register-based data path control where deterministic edge-triggered behavior and robust noise immunity are required.

Technical Context

The SN74LVC74ADBRG4 implements two independent CMOS D flip-flops, each with asynchronous active-low preset (PRE) and clear (CLR), synchronous positive-edge clocking on CLK, and complementary Q/Q̅ outputs. Its overvoltage-tolerant inputs enable reliable level translation between 1.8 V, 2.5 V, and 3.3 V domains without external circuitry.

It operates across –40°C to 125°C, supports up to 150 MHz clock frequency at 3.3 V and –40°C to 85°C, and features low ground bounce (<0.8 V) and undershoot (>2 V) under switching conditions - critical for signal integrity in dense PCB layouts with fast edges.

Key Specifications

Pinout & Package

SN74LVC74ADBRG4 is packaged in a 14-pin SSOP (DB) with 6.2 mm × 7.8 mm body size and 0.65 mm lead pitch. The package includes exposed thermal pad compatibility and is RoHS-compliant with NiPdAu lead finish and Level-1 moisture sensitivity rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC74ADBRG4, the TSSOP alternative offers identical functionality in a marginally larger but more manufacturable package, while the WQFN version delivers superior thermal efficiency and miniaturization at the cost of tighter assembly process control - selection depends on board area, thermal budget, and production capability.

Availability

SN74LVC74ADBRG4 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, telecom line card timing, and test equipment signal generation requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVC74ADBRG4 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 solutions, with decades of experience in high-reliability logic families and automotive-qualified components.

The SN74LVC74A product line delivers low-voltage, high-speed dual D flip-flops optimized for mixed-signal systems requiring robust level translation, deterministic timing, and extended temperature operation in industrial and automotive applications.

FAQ

What is the maximum clock frequency supported by SN74LVC74ADBRG4?

SN74LVC74ADBRG4 supports up to 150 MHz at VCC = 3.3 V and TA = –40°C to 85°C. At full –40°C to 125°C range and VCC = 3.3 V, the guaranteed maximum is 100 MHz. These values are validated per TI's switching characteristics tables and reflect worst-case timing across voltage and temperature.

Does SN74LVC74ADBRG4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of SN74LVC74ADBRG4 must be tied to VCC or GND to prevent floating states that cause excessive current draw, unpredictable outputs, or increased EMI. TI explicitly recommends this in Application Report SCBA004 to ensure proper CMOS logic operation and device reliability.

Can SN74LVC74ADBRG4 safely interface with 5 V logic outputs?

Yes - SN74LVC74ADBRG4 inputs are rated for up to 5.5 V regardless of VCC, making it safe to connect directly to 5 V TTL or CMOS outputs without level-shifting circuitry. This overvoltage tolerance is confirmed in the Recommended Operating Conditions table and Absolute Maximum Ratings section of the datasheet.

What is the purpose of the PRE and CLR pins on SN74LVC74ADBRG4?

PRE (preset) and CLR (clear) are asynchronous active-low control inputs on SN74LVC74ADBRG4. When asserted, PRE forces Q = HIGH and CLR forces Q = LOW - overriding clock and data inputs. They enable immediate, clock-independent state initialization or fault recovery in safety-critical logic paths.

Is SN74LVC74ADBRG4 suitable for automotive applications?

Yes - SN74LVC74ADBRG4 is qualified for operation from –40°C to 125°C and meets AEC-Q100 stress test requirements for logic devices. Its robust ESD rating (2000 V HBM), wide supply range, and guaranteed timing across temperature make it suitable for body control modules, lighting controllers, and infotainment interfaces in automotive systems.