Texas Instruments SN74F74DRG4

Overview

SN74F74DRG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent preset and clear inputs, operating across 0°C to 70°C, supporting up to 80 MHz clock frequency, 3 ns minimum setup time for data, and 3.6 ns typical tPHL propagation delay. It serves as a synchronous storage element in digital control logic, state machines, and clock-domain synchronization circuits.

For engineers reviewing the SN74F74DRG4 datasheet, SN74F74DRG4 pinout, SN74F74DRG4 application, or SN74F74DRG4 equivalent, key selection considerations include its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), guaranteed 20 mA low-level output drive, dual independent flip-flop architecture with asynchronous set/reset, and SOIC-14 packaging suitable for automated assembly and industrial control PCBs.

Technical Context

This device implements two electrically isolated D-type latches triggered on the rising edge of CLK, each with dedicated PRE and CLR inputs that override clocked operation when asserted low. Its internal structure uses bipolar TTL circuitry with Schottky-clamped transistors to achieve high-speed switching and noise immunity.

Timing behavior is defined by voltage-level–based clock detection-not edge-rate dependent-enabling robust operation with moderate clock rise times. The function table confirms non-overlapping active-low asynchronous control: PRE and CLR are dominant over CLK/D, and the L-L PRE/CLR state is explicitly flagged as nonstable and not guaranteed for VOH compliance.

Key Specifications

Pinout & Package

SN74F74DRG4 is packaged in a 14-pin SOIC (D package), 3.9 mm wide, 1.75 mm max height, RoHS-compliant with NiPdAu lead finish and moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS74ADR, SN74F74DRG4 delivers 3× higher clock rate and faster propagation, making it preferable for timing-critical upgrades; versus SN74AC74DR, it offers plug-and-play TTL compatibility but lacks voltage flexibility and ultra-low power benefits.

Availability

SN74F74DRG4 is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, legacy system upgrades, and education & prototyping requiring stable component supply and long-term obsolescence management.

Supply support for SN74F74DRG4 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, automotive, and aerospace qualification programs.

The SN74F74DRG4 belongs to TI's 74F logic family-designed specifically for high-speed TTL-compatible digital systems requiring reliable 5 V operation, deterministic timing, and backward compatibility with legacy 74xx architectures.

FAQ

What is the maximum clock frequency supported by SN74F74DRG4?

The SN74F74DRG4 supports a maximum clock frequency of 80 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is specified in the timing requirements table of the official datasheet and reflects guaranteed operation across the full commercial temperature range (0°C to 70°C). At extremes of voltage or temperature, derating applies-e.g., operation at 4.5 V or 70°C may reduce usable frequency. The SN74F74DRG4 achieves this via optimized bipolar TTL circuitry with Schottky clamping.

Does SN74F74DRG4 support true dual independent operation of its two flip-flops?

Yes, SN74F74DRG4 provides fully independent operation: each flip-flop has dedicated CLK, D, PRE, CLR, Q, and Q̅ terminals with no shared internal nodes. The logic diagram and pinout confirm electrical isolation between sections-one flip-flop's clock or control signals have zero effect on the other. This enables concurrent use in separate timing domains, such as one handling input synchronization while the other manages output gating, without crosstalk or timing dependency.

Can SN74F74DRG4 be used as a direct replacement for SN74LS74 in an existing design?

SN74F74DRG4 can serve as a functional upgrade for SN74LS74 in most cases due to identical SOIC-14 pinout, matching TTL logic thresholds (VIL = 0.8 V, VIH = 2.0 V), and compatible output drive strength. However, it draws higher supply current (ICC = 10.5–16 mA vs. ~19 mA for LS74) and operates faster-requiring verification of timing margins and potential PCB layout adjustments for noise suppression. It is not a drop-in replacement if the original design relies on LS74's slower propagation for intentional delay.

What does the "G4" suffix indicate in SN74F74DRG4?

The "G4" suffix in SN74F74DRG4 denotes Texas Instruments' green packaging standard: RoHS-compliant, lead-free (NiPdAu finish), and halogen-free materials. It replaces earlier "G3" or non-Gx variants and indicates conformance to JEDEC J-STD-609A Class 2a marking. The "DR" portion specifies tape-and-reel packaging (2500 units per reel), while "G4" confirms environmental compliance without altering electrical or timing specifications-SN74F74DRG4 performs identically to SN74F74DR under the same conditions.

Is SN74F74DRG4 suitable for use in automotive applications?

No, SN74F74DRG4 is not qualified for automotive applications. It is rated for the commercial temperature range (0°C to 70°C) and lacks AEC-Q100 qualification, extended temperature screening, or automotive-specific reliability testing. For automotive use, TI offers the SN74F74QPWRQ1 (qualified to AEC-Q100 Grade 2, –40°C to +105°C) or pin-compatible alternatives like SN74LVC74A-Q1. Using SN74F74DRG4 in automotive systems would risk thermal failure, timing violation, or premature wear outside its specified operating envelope.