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

Texas Instruments SN74LS74ANE4

Name: SN74LS74ANE4
Brand: Texas Instruments
SKU: SN74LS74ANE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS74ANE4

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: SN74LS74ANE4.pdf

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

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Product details

Overview

SN74LS74ANE4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop in a 14-pin PDIP package, operating from 4.75 V to 5.25 V with typical propagation delay of 15 ns and maximum clock frequency of 30 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 in industrial control panels and legacy instrumentation.

For engineers reviewing the SN74LS74ANE4 datasheet, SN74LS74ANE4 pinout, SN74LS74ANE4 application, or SN74LS74ANE4 equivalent, this page delivers verified electrical specs, validated pin functions, real-world use cases in TTL-based systems, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The SN74LS74ANE4 implements two independent edge-triggered D flip-flops with asynchronous active-low preset (PR̅) and clear (CLR̅) inputs. Each section samples the D input on the rising edge of the clock (CLK), latching the value to Q and its inverse to Q̅.

Designed for TTL-compatible logic families, it interfaces directly with 74LS, 74S, and 74F series devices without level-shifting. Its bipolar transistor-transistor logic (TTL) architecture ensures robust noise immunity and predictable timing across 0°C to 70°C ambient operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74LS TTL - ensures direct compatibility with legacy LS-series logic and predictable fanout (20 LS loads).
Supply Voltage	4.75 V to 5.25 V - requires stable +5 V rail; operation outside this range risks incorrect state retention or latch-up.
Propagation Delay	15 ns max (t_PLH/t_PHL) - defines minimum clock-to-output timing for synchronous design margining.
Maximum Clock Frequency	30 MHz - sets upper bound for reliable toggle rate in counters or shift registers.
Input Voltage Thresholds	V_IL = 0.8 V, V_IH = 2.0 V - defines valid logic low/high recognition levels for D, CLK, PR̅, and CLR̅ pins.
Output Drive Capability	I_OL = 8 mA, I_OH = –0.4 mA - supports direct drive of up to 20 standard TTL inputs without buffering.

Pinout & Package

SN74LS74ANE4 uses a 14-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with 0.100-inch lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot at the top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1	1CLR̅	Asynchronous active-low clear for first flip-flop; forces Q1 = 0, Q̅1 = 1 regardless of clock or D1.
2	1D	Data input for first flip-flop; sampled on rising CLK edge and latched to Q1.
3	1CLK	Clock input for first flip-flop; rising edge triggers sampling of 1D and update of Q1/Q̅1.
4	1PR̅	Asynchronous active-low preset for first flip-flop; forces Q1 = 1, Q̅1 = 0 independently of clock.
5	1Q	True output of first flip-flop; reflects latched 1D value after each valid clock edge.
6	1Q̅	Inverted output of first flip-flop; always complementary to 1Q under normal operation.
7	GND	Ground reference for all internal circuitry and I/O; must be connected to system 0 V plane.
8	2Q̅	Inverted output of second flip-flop; always complementary to 2Q under normal operation.
9	2Q	True output of second flip-flop; reflects latched 2D value after each valid clock edge.
10	2PR̅	Asynchronous active-low preset for second flip-flop; forces Q2 = 1, Q̅2 = 0 independently of clock.
11	2CLK	Clock input for second flip-flop; rising edge triggers sampling of 2D and update of Q2/Q̅2.
12	2D	Data input for second flip-flop; sampled on rising 2CLK edge and latched to Q2.
13	2CLR̅	Asynchronous active-low clear for second flip-flop; forces Q2 = 0, Q̅2 = 1 regardless of clock or D2.
14	V_CC	+5 V supply input; powers all internal TTL gates and output drivers; bypass capacitor required near pin.

Key Features

Feature	Design Value
Dual independent D flip-flops	Enables compact implementation of two-bit storage or synchronized control paths in one IC.
Positive-edge clock triggering	Ensures deterministic state updates aligned to rising clock transitions, simplifying timing analysis.
Asynchronous preset and clear	Allows immediate initialization or reset of each flip-flop without waiting for next clock edge.
TTL-compatible input/output levels	Eliminates need for level translators when interfacing with 74LS/74S logic families.
Complementary Q and Q̅ outputs	Provides both true and inverted logic states simultaneously for efficient combinational logic synthesis.

Applications

Counter Design	State Machine Control
Use Scenario: Building a 4-bit binary counter using cascaded SN74LS74ANE4 devices in a ripple configuration. IC Role / Device Role / Timing Role: Each SN74LS74ANE4 provides two toggle-capable D flip-flops; Q output feeds D input of next stage via inverter to achieve divide-by-2 behavior. Use Value: Enables precise clock division with known 15 ns propagation delay per stage, supporting stable counting up to 7.5 MHz input clock.	Use Scenario: Implementing the sequential logic core of a vending machine controller with discrete states (idle, coin accepted, selection made, dispense). IC Role / Device Role / Timing Role: SN74LS74ANE4 stores current state bits; clocked by system enable signal, updated based on coin sensor and button inputs. Use Value: Provides deterministic, edge-triggered state retention with asynchronous reset for power-on initialization and error recovery.
Data Latching	Glitch-Free Signal Synchronization
Use Scenario: Capturing parallel data from an analog-to-digital converter (ADC) bus before processing by a microcontroller. IC Role / Device Role / Timing Role: SN74LS74ANE4 acts as a transparent latch interface; D inputs tied to ADC data lines, CLK driven by conversion-complete strobe. Use Value: Holds stable digital values during microcontroller read cycles, eliminating metastability risk from asynchronous bus sampling.	Use Scenario: Synchronizing an external interrupt request signal crossing from an asynchronous domain into a synchronous CPU clock domain. IC Role / Device Role / Timing Role: Two SN74LS74ANE4 stages form a synchronizer chain; first stage captures async signal, second stage removes metastability. Use Value: Reduces probability of metastable failure to <10⁻⁹ per cycle using proven two-stage TTL flop topology.

Counter Design

State Machine Control

Use Scenario: Building a 4-bit binary counter using cascaded SN74LS74ANE4 devices in a ripple configuration.

IC Role / Device Role / Timing Role: Each SN74LS74ANE4 provides two toggle-capable D flip-flops; Q output feeds D input of next stage via inverter to achieve divide-by-2 behavior.

Use Value: Enables precise clock division with known 15 ns propagation delay per stage, supporting stable counting up to 7.5 MHz input clock.

Use Scenario: Implementing the sequential logic core of a vending machine controller with discrete states (idle, coin accepted, selection made, dispense).

IC Role / Device Role / Timing Role: SN74LS74ANE4 stores current state bits; clocked by system enable signal, updated based on coin sensor and button inputs.

Use Value: Provides deterministic, edge-triggered state retention with asynchronous reset for power-on initialization and error recovery.

Data Latching

Glitch-Free Signal Synchronization

Use Scenario: Capturing parallel data from an analog-to-digital converter (ADC) bus before processing by a microcontroller.

IC Role / Device Role / Timing Role: SN74LS74ANE4 acts as a transparent latch interface; D inputs tied to ADC data lines, CLK driven by conversion-complete strobe.

Use Value: Holds stable digital values during microcontroller read cycles, eliminating metastability risk from asynchronous bus sampling.

Use Scenario: Synchronizing an external interrupt request signal crossing from an asynchronous domain into a synchronous CPU clock domain.

IC Role / Device Role / Timing Role: Two SN74LS74ANE4 stages form a synchronizer chain; first stage captures async signal, second stage removes metastability.

Use Value: Reduces probability of metastable failure to <10⁻⁹ per cycle using proven two-stage TTL flop topology.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS74ADR	SOIC-14 package, RoHS-compliant NiPdAu finish, MSL Level-1 rating; identical electrical specs and pinout.	Suitable for surface-mount PCB assembly; requires reflow profile compliance and smaller board footprint.	Select SN74LS74ADR for new SMT designs where space and automated assembly efficiency are priorities.
SN74S74N	74S-family variant: faster t_pd (4 ns), higher I_OL (20 mA), but higher power consumption (19 mW vs. 7 mW) and tighter V_CC tolerance (4.95–5.05 V).	Used in high-speed legacy systems requiring sub-5 ns propagation; not drop-in due to power and voltage sensitivity.	Choose SN74S74N only when 4 ns timing is mandatory and thermal/power budgets allow.

Compared with SN74LS74ADR and SN74S74N, the SN74LS74ANE4 offers optimal balance of speed, power, and through-hole manufacturability for repair, prototyping, and industrial control applications where legacy PDIP layout is retained.

Availability

SN74LS74ANE4 is available at Aetrix Electronics and suitable for industrial control panels, test equipment calibration circuits, and legacy instrumentation systems requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74LS74ANE4 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 solutions for industrial, automotive, and communications markets.

The SN74LS74ANE4 belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in TTL-based digital systems deployed in harsh environments and long-lifecycle infrastructure.

FAQ

What is the maximum operating temperature range for the SN74LS74ANE4?

The SN74LS74ANE4 is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with its PDIP-N package and 74LS logic family classification. Operation outside this range may result in timing violations, increased propagation delay, or failure to meet guaranteed setup/hold times. For extended temperature applications, consider military-grade variants like SNJ54LS74AJ (–55°C to +125°C).

Does the SN74LS74ANE4 support asynchronous reset and set functions?

Yes, the SN74LS74ANE4 provides fully asynchronous active-low preset (PR̅) and clear (CLR̅) inputs for each of its two D flip-flops. These inputs override the clock and data signals, forcing Q = 1 or Q = 0 immediately upon assertion-regardless of CLK state. This enables immediate initialization, emergency shutdown, or state recovery without waiting for the next clock edge.

Can the SN74LS74ANE4 be used as a toggle flip-flop (T flip-flop)?

Yes, the SN74LS74ANE4 can function as a T flip-flop by connecting Q̅ to the D input of the same section. On each rising clock edge, the device toggles its output state. This configuration is commonly used in divide-by-2 circuits and binary counters. The SN74LS74ANE4's guaranteed 15 ns propagation delay and 30 MHz maximum clock frequency make it suitable for stable toggle operation up to 15 MHz.

Is the SN74LS74ANE4 RoHS compliant?

Yes, the SN74LS74ANE4 is RoHS compliant, featuring NiPdAu (nickel-palladium-gold) lead finish and meeting EU Directive 2011/65/EU requirements. Its PDIP-N package contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). Full compliance documentation is available from Texas Instruments' official product page and material declarations.

How does the SN74LS74ANE4 differ from the SN74LS74AD?

The SN74LS74ANE4 and SN74LS74AD share identical logic functionality and DC/AC electrical specifications, but differ in package and status: SN74LS74ANE4 uses a 14-pin PDIP (N) package and remains active, while SN74LS74AD uses SOIC (D) and is obsolete. The PDIP version supports through-hole assembly and prototyping, whereas the SOIC variant was intended for surface-mount production but is no longer manufactured or stocked by TI.

SN74LS74ANE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LS

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

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:: Through Hole

Supplier Device Package:: 14-PDIP

SN74LS74ANE4 FAQ

1.How can I place an order for SN74LS74ANE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS74ANE4 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 SN74LS74ANE4 reliable?

The price and inventory of SN74LS74ANE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS74ANE4 is usually 5 days.

3.What payment methods are accepted for SN74LS74ANE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS74ANE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS74ANE4?

SN74LS74ANE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS74ANE4 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 SN74LS74ANE4?

For technical support, including SN74LS74ANE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS74ANE4 requirements.

6.How does Aetrix verify that SN74LS74ANE4 is sourced from the original manufacturer or authorized distributors?

All SN74LS74ANE4 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 SN74LS74ANE4 meets industry standards.

7.What is the process for return or replacement of SN74LS74ANE4?

All SN74LS74ANE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS74ANE4, 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 SN74LS74ANE4 part is unused and in its original packaging.

Return procedure for SN74LS74ANE4:

1.Submit a request within 90 days.

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

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