Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74LS74ADRG4

Name: SN74LS74ADRG4
Brand: Texas Instruments
SKU: SN74LS74ADRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74LS74ADRG4

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74LS74ADRG4.pdf

Description:: IC FF D-TYPE DUAL 1BIT 14SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,172

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SN74LS74ADRG4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop in a 14-pin SOIC package, operating from 4.75 V to 5.25 V with typical propagation delay of 15 ns and maximum clock frequency of 33 MHz. It features complementary Q and Q̅ outputs per section, independent preset and clear inputs, and is used in synchronous logic control, data latching, and clock division circuits.

For engineers reviewing the SN74LS74ADRG4 datasheet, SN74LS74ADRG4 pinout, SN74LS74ADRG4 application, or SN74LS74ADRG4 equivalent, this page delivers verified electrical specs, package dimensions, functional role in edge-sensitive sequential logic, and validated drop-in alternatives for industrial control and legacy TTL system upgrades.

Technical Context

The SN74LS74ADRG4 implements two independent D-type flip-flops with asynchronous active-low preset (PR̅) and clear (CLR̅) inputs, each triggered on the rising edge of the clock (CLK). Its TTL-compatible input thresholds and output drive capability (I_OH = –0.4 mA, I_OL = 8 mA) ensure interoperability with standard 74LS logic families.

Designed for deterministic state capture, it requires minimum setup time (t_su = 20 ns) and hold time (t_h = 0 ns) relative to CLK, and guarantees metastability immunity under specified timing margins. The device operates within 0°C to 70°C ambient temperature and exhibits typical power dissipation of 19 mW per flip-flop at 5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74LS TTL - ensures compatibility with legacy LS-series logic and predictable noise margins (V_IH = 2.0 V min, V_IL = 0.8 V max).
Supply Voltage	4.75 V to 5.25 V - strict 5-V nominal operation; no wide-V_CC support; requires regulated 5-V rail.
Max Clock Frequency	33 MHz - defines upper limit for reliable synchronous state updates in counters or shift registers.
Propagation Delay	15 ns (typical, CLK to Q) - determines minimum cycle time and critical path timing in sequential circuits.
Output Drive	8 mA sink / –0.4 mA source - sufficient to drive 10 LS-TTL loads or interface directly with 74HC inputs via pull-up.
Operating Temperature	0°C to 70°C - commercial-grade rating; not qualified for extended or military temperature ranges.
Package	SOIC-14 (D), 3.90 mm width - surface-mount footprint compatible with IPC-7351 land pattern D0014A.

Pinout & Package

SOIC-14 (Package D), 3.90 mm body width, 1.75 mm max height, 1.27 mm lead pitch. RoHS-compliant NiPdAu lead finish, MSL Level-1, tape-and-reel packaging (2500 pcs/reel).

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Q or Q̅ output	Complementary registered outputs per flip-flop; Q high after positive CLK edge when D = high.
2, 5, 11, 12	D input	Data input sampled on rising CLK edge; determines next-state value for associated Q output.
3, 6, 8, 14	CLK, PR̅, CLR̅	CLK: positive-edge trigger; PR̅/CLR̅: asynchronous active-low set/reset - override clocked behavior.
7, 14	GND / V_CC	Pin 7 = ground reference; Pin 14 = +5 V supply - decoupling capacitor required near Pin 14.

Key Features

Feature	Design Value
Dual independent flip-flops	Two fully isolated storage elements in one IC - eliminates need for two discrete packages in register files or dual-channel control.
Asynchronous preset/clear	PR̅ and CLR̅ assert immediately regardless of CLK - enables hard reset or initialization without waiting for clock edge.
TTL-compatible I/O	Direct interconnection with 74LS, 74S, and 74F families without level-shifting - preserves signal integrity in mixed-logic systems.
Edge-triggered operation	Rising-edge sensitivity prevents unintended toggling from noisy or slow-rising clocks - improves reliability in real-world digital environments.
Commercial temperature range	Validated performance from 0°C to 70°C - suitable for office equipment, test instruments, and non-mission-critical embedded controllers.

Applications

Industrial Control Sequencing	Digital Clock Division
Use Scenario: Managing step sequence in PLC-based motor control where each stage must advance only on confirmed sensor input and clock pulse. IC Role / Device Role / Timing Role: SN74LS74ADRG4 acts as a synchronous state register, capturing enable signals and advancing machine states on rising clock edges. Use Value: Ensures deterministic, glitch-free transitions between operational phases using edge-triggered sampling and asynchronous reset for emergency stop.	Use Scenario: Deriving a 1 MHz clock from a 4 MHz master oscillator for microcontroller peripheral timing. IC Role / Device Role / Timing Role: SN74LS74ADRG4 configured as a toggle flip-flop (D = Q̅) divides input frequency by two per stage. Use Value: Provides exact 2× division with zero duty-cycle error and minimal added jitter (<1 ns), maintaining timing precision across cascaded stages.
Data Latching in Legacy Systems	Synchronous Debouncing Circuit
Use Scenario: Capturing parallel switch inputs in an industrial HMI panel before scanning by a microprocessor. IC Role / Device Role / Timing Role: SN74LS74ADRG4 holds stable switch states during microcontroller read cycles, synchronized to a dedicated latch strobe. Use Value: Eliminates metastability and contact bounce artifacts by enforcing single-point sampling aligned to system clock domain.	Use Scenario: Cleaning mechanical pushbutton signals before feeding into interrupt logic of an 8-bit MCU. IC Role / Device Role / Timing Role: SN74LS74ADRG4 used in a two-stage synchronizer (input → first FF → second FF) to suppress sub-clock-period glitches. Use Value: Reduces asynchronous input failure probability to <10^–9 per sample using proven 2-stage metastability hardening.

Industrial Control Sequencing

Digital Clock Division

Use Scenario: Managing step sequence in PLC-based motor control where each stage must advance only on confirmed sensor input and clock pulse.

IC Role / Device Role / Timing Role: SN74LS74ADRG4 acts as a synchronous state register, capturing enable signals and advancing machine states on rising clock edges.

Use Value: Ensures deterministic, glitch-free transitions between operational phases using edge-triggered sampling and asynchronous reset for emergency stop.

Use Scenario: Deriving a 1 MHz clock from a 4 MHz master oscillator for microcontroller peripheral timing.

IC Role / Device Role / Timing Role: SN74LS74ADRG4 configured as a toggle flip-flop (D = Q̅) divides input frequency by two per stage.

Use Value: Provides exact 2× division with zero duty-cycle error and minimal added jitter (<1 ns), maintaining timing precision across cascaded stages.

Data Latching in Legacy Systems

Synchronous Debouncing Circuit

Use Scenario: Capturing parallel switch inputs in an industrial HMI panel before scanning by a microprocessor.

IC Role / Device Role / Timing Role: SN74LS74ADRG4 holds stable switch states during microcontroller read cycles, synchronized to a dedicated latch strobe.

Use Value: Eliminates metastability and contact bounce artifacts by enforcing single-point sampling aligned to system clock domain.

Use Scenario: Cleaning mechanical pushbutton signals before feeding into interrupt logic of an 8-bit MCU.

IC Role / Device Role / Timing Role: SN74LS74ADRG4 used in a two-stage synchronizer (input → first FF → second FF) to suppress sub-clock-period glitches.

Use Value: Reduces asynchronous input failure probability to <10^–9 per sample using proven 2-stage metastability hardening.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS74ADR	Identical electrical specs and pinout; same SOIC-14 package; differs only in tape-and-reel packaging (2500 pcs vs. 2500 pcs) and marking (LS74A vs. LS74A).	No functional difference; both rated for 0°C to 70°C and RoHS-compliant NiPdAu finish.	Select SN74LS74ADR if sourcing from distributors with legacy stock; SN74LS74ADRG4 is TI's current green-marked production version.
SN74HC74DR	CMOS family (74HC); higher noise immunity (V_IH = 3.15 V min), wider V_CC (2 V–6 V), lower I_CC (4 µA typ), but slower t_pd (15 ns @ 4.5 V) and no direct TTL drive capability.	Requires level translation when interfacing with legacy 74LS logic; unsuitable for direct replacement without circuit review.	Choose SN74HC74DR only for new low-power designs with pure CMOS interfaces; avoid in mixed-LS/HC systems without buffer redesign.

Compared with SN74LS74ADR, SN74LS74ADRG4 offers identical functionality with updated environmental compliance marking; versus SN74HC74DR, it provides guaranteed TTL interoperability and deterministic drive strength but consumes more static power and lacks voltage flexibility.

Availability

SN74LS74ADRG4 is available at Aetrix Electronics and suitable for industrial control sequencing, digital clock division, data latching in legacy systems, and synchronous debouncing circuits requiring stable component supply and long-term obsolescence management.

Supply support for SN74LS74ADRG4 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LS74ADRG4 belongs to TI's legacy 74LS logic product line, engineered for robustness and interoperability in TTL-based digital systems deployed from the 1970s through modern industrial retrofits.

FAQ

What is the maximum clock frequency supported by the SN74LS74ADRG4?

The SN74LS74ADRG4 supports a maximum clock frequency of 33 MHz under standard conditions (V_CC = 5 V, T_A = 25°C). This value is derived from the maximum guaranteed propagation delay (t_pd = 30 ns) and setup time (t_su = 20 ns), ensuring reliable state capture across the commercial temperature range. Exceeding 33 MHz may result in setup/hold violations and metastability.

Does the SN74LS74ADRG4 have Schmitt-trigger inputs?

No, the SN74LS74ADRG4 does not feature Schmitt-trigger inputs. Its D, CLK, PR̅, and CLR̅ inputs follow standard TTL threshold specifications (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) with no hysteresis. For noisy signal environments, external RC filtering or a dedicated Schmitt-trigger buffer (e.g., SN74LS14) must be used ahead of SN74LS74ADRG4 inputs.

Can the SN74LS74ADRG4 operate at 3.3 V?

No, the SN74LS74ADRG4 is not specified for 3.3 V operation. Its absolute maximum V_CC is 5.5 V, and minimum operating V_CC is 4.75 V. At 3.3 V, the internal TTL circuitry fails to meet logic thresholds and output drive requirements. Use SN74LVC74A or SN74AUP1G74 for 3.3 V–compatible dual D-flip-flops.

What is the function of pins 3 and 6 on the SN74LS74ADRG4?

Pins 3 and 6 on the SN74LS74ADRG4 are the clock (CLK) inputs for Flip-Flop A and Flip-Flop B, respectively. Each is a positive-edge-triggered input: the D-input value is transferred to Q on the rising transition of the respective CLK signal. These pins are electrically identical and independently controlled - no internal connection exists between them.

Is the SN74LS74ADRG4 pin-compatible with the SN74LS74AN?

Yes, the SN74LS74ADRG4 (SOIC-14) and SN74LS74AN (PDIP-14) share identical pin numbering and signal assignment - both follow the standard 74LS74 pinout. However, they differ in package type, thermal characteristics, and mounting method; PCB layout must match the selected package's footprint and soldering profile.

SN74LS74ADRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LS

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Function:: Set(Preset) and Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 2

Number of Bits per Element:: 1

Clock Frequency:: 33 MHz

Max Propagation Delay @ V, Max CL:: 40ns @ 5V, 15pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 400µA, 8mA

Voltage - Supply:: 4.75V ~ 5.25V

Current - Quiescent (Iq):: 8 mA

Input Capacitance:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

SN74LS74ADRG4 FAQ

1.How can I place an order for SN74LS74ADRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS74ADRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74LS74ADRG4 reliable?

The price and inventory of SN74LS74ADRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS74ADRG4 is usually 5 days.

3.What payment methods are accepted for SN74LS74ADRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS74ADRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS74ADRG4?

SN74LS74ADRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS74ADRG4 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74LS74ADRG4?

For technical support, including SN74LS74ADRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS74ADRG4 requirements.

6.How does Aetrix verify that SN74LS74ADRG4 is sourced from the original manufacturer or authorized distributors?

All SN74LS74ADRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LS74ADRG4 meets industry standards.

7.What is the process for return or replacement of SN74LS74ADRG4?

All SN74LS74ADRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS74ADRG4, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74LS74ADRG4 part is unused and in its original packaging.

Return procedure for SN74LS74ADRG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…