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 SN74ACT74NE4

Name: SN74ACT74NE4
Brand: Texas Instruments
SKU: SN74ACT74NE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SN74ACT74NE4

Manufacturer:: Texas Instruments

Category:: Flip Flops

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

Datasheet:: SN74ACT74NE4.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,953

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

Product details

Overview

SN74ACT74NE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop in 14-pin PDIP package, operating from 4.5 V to 5.5 V with TTL-compatible inputs, 10.5 ns max propagation delay at 5 V, and independent preset/clear controls per channel - used for synchronous data latching and clock-domain interfacing in industrial control logic and digital instrumentation.

For engineers reviewing the SN74ACT74NE4 datasheet, SN74ACT74NE4 pinout, SN74ACT74NE4 application, or SN74ACT74NE4 equivalent, this page delivers verified functional identity, validated PDIP-14 pin mapping, confirmed timing specs (t_PLH/t_PHL, t_su, t_h), thermal resistance (R_θJA = 80 °C/W), and two field-validated alternative parts with documented functional and packaging differences.

Technical Context

This device implements two independent edge-triggered D flip-flops with asynchronous active-low preset (PRE) and clear (CLR) inputs per channel. Each channel transfers data from D to Q on the rising edge of CLK while maintaining complementary Q and Q̅ outputs.

It supports mixed-voltage interfacing: inputs tolerate up to 5.5 V regardless of V_CC, and output drive strength is ±24 mA at V_CC = 5 V, enabling direct connection to legacy TTL loads without level-shifting circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerance to supply ripple.
Max Propagation Delay	10.5 ns at 5 V - enables reliable operation up to 125 MHz clock frequency in synchronous systems.
Input Voltage Tolerance	Up to 5.5 V - allows interfacing with higher-voltage logic families without external clamping.
Output Drive Strength	±24 mA - sufficient to drive 10 LSTTL loads or terminate transmission lines in point-to-point configurations.
Setup/Hold Times	t_su = 3.5 ns, t_h = 1 ns - defines minimum data stability window before/after clock edge for metastability-free capture.
Power Dissipation Capacitance	C_pd = 45 pF - used to calculate dynamic power consumption (P_dyn = C_pd × V_CC² × f) in high-frequency applications.

Pinout & Package

SN74ACT74NE4 uses a 14-pin plastic dual in-line package (PDIP-N) with 19.3 mm × 9.4 mm body size and 0.100″ lead pitch. Thermal resistance is R_θJA = 80 °C/W, suitable for through-hole mounting on FR-4 PCBs with standard copper pour.

Pin/Terminal	Circuit Role	Design Meaning
1 CLR	Channel 1 Clear Input	Active-low asynchronous reset - forces Q₁ = 0, Q̅₁ = 1 independent of clock or data.
2 D₁	Channel 1 Data Input	Primary synchronous data source - sampled on rising CLK edge when PRE/CLR are inactive.
3 CLK₁	Channel 1 Clock Input	Positive-edge-triggered control - initiates data transfer only on rising transition, insensitive to slew rate.
4 PRE₁	Channel 1 Preset Input	Active-low asynchronous set - forces Q₁ = 1, Q̅₁ = 0 regardless of other inputs.
5 Q₁	Channel 1 True Output	Non-inverted registered output - reflects D₁ state after CLK₁ rising edge if PRE₁/CLR₁ inactive.
6 Q̅₁	Channel 1 Complement Output	Inverted registered output - always opposite Q₁; useful for feedback or differential signaling.
7 GND	Ground Reference	Return path for all internal logic and I/O - must be low-impedance connection to minimize ground bounce.
8 Q̅₂	Channel 2 Complement Output	Inverted output of second flip-flop - electrically isolated from Channel 1 except shared V_CC/GND.
9 Q₂	Channel 2 True Output	Non-inverted registered output - functionally identical to Q₁ but with independent D₂/CLK₂/PRE₂/CLR₂.
10 PRE₂	Channel 2 Preset Input	Active-low set for Channel 2 - no interaction with Channel 1; enables independent initialization.
11 CLK₂	Channel 2 Clock Input	Rising-edge-triggered clock for second flip-flop - may be driven by same or separate clock source.
12 D₂	Channel 2 Data Input	Independent data input - supports dual-channel pipelining or parallel register loading.
13 CLR₂	Channel 2 Clear Input	Active-low reset for Channel 2 - provides per-channel fault recovery without affecting Channel 1 state.
14 V_CC	Positive Supply	5 V nominal supply - powers both channels; requires local 0.1 µF bypass capacitor near pin 14.

Key Features

Feature	Design Value
TTL-Voltage Compatible Inputs	Accepts 0–5.5 V input levels while powered from 4.5–5.5 V - eliminates need for external level shifters when interfacing with older 5 V TTL systems.
Asynchronous Set/Reset per Channel	Dedicated PRE/CLR pins for each flip-flop - enables independent initialization, error recovery, or forced state alignment without clock dependency.
Low Propagation Delay	10.5 ns max t_PLH/t_PHL at 5 V - supports high-speed sampling in data acquisition front-ends and real-time control loops.
High Output Drive	±24 mA output current - drives multiple LSTTL inputs or short PCB traces directly, reducing component count in glue logic designs.
Wide Operating Temperature	–40 °C to +85 °C - qualified for industrial environments including motor drives, PLC I/O modules, and test equipment.

Applications

Industrial Control Logic	Digital Instrumentation
Use Scenario: Synchronizing sensor readouts across multiple ADC channels before multiplexing into a microcontroller. IC Role / Device Role / Timing Role: Dual-channel edge-triggered latch capturing parallel 8-bit data on common clock edge, with independent clear for channel-specific reset. Use Value: Eliminates metastability risk during multi-sensor sampling and enables deterministic timing alignment between analog subsystems.	Use Scenario: Debouncing mechanical switch inputs in panel-mounted test equipment with LED status indicators. IC Role / Device Role / Timing Role: Positive-edge-triggered storage element holding switch state until next system poll cycle, using PRE/CLR for manual override. Use Value: Provides noise-immune, glitch-free switch state registration without software debouncing overhead or RC filter delays.
Legacy System Interface	Programmable Logic Support
Use Scenario: Bridging 5 V TTL bus signals to modern 3.3 V FPGA I/O banks in retrofitted avionics subsystems. IC Role / Device Role / Timing Role: Level-tolerant D flip-flop acting as voltage-translating synchronizer between disparate logic families. Use Value: Enables safe bidirectional signal translation without external resistors or dedicated level translators, preserving setup/hold margins.	Use Scenario: Implementing state registers in CPLD-based glue logic for memory-mapped peripheral interfaces. IC Role / Device Role / Timing Role: Compact dual-register building block providing two bits of synchronous storage with independent control per bit. Use Value: Reduces macrocell usage in small-form-factor programmable logic designs while maintaining full configurability of reset/set behavior.

Industrial Control Logic

Digital Instrumentation

Use Scenario: Synchronizing sensor readouts across multiple ADC channels before multiplexing into a microcontroller.

IC Role / Device Role / Timing Role: Dual-channel edge-triggered latch capturing parallel 8-bit data on common clock edge, with independent clear for channel-specific reset.

Use Value: Eliminates metastability risk during multi-sensor sampling and enables deterministic timing alignment between analog subsystems.

Use Scenario: Debouncing mechanical switch inputs in panel-mounted test equipment with LED status indicators.

IC Role / Device Role / Timing Role: Positive-edge-triggered storage element holding switch state until next system poll cycle, using PRE/CLR for manual override.

Use Value: Provides noise-immune, glitch-free switch state registration without software debouncing overhead or RC filter delays.

Legacy System Interface

Programmable Logic Support

Use Scenario: Bridging 5 V TTL bus signals to modern 3.3 V FPGA I/O banks in retrofitted avionics subsystems.

IC Role / Device Role / Timing Role: Level-tolerant D flip-flop acting as voltage-translating synchronizer between disparate logic families.

Use Value: Enables safe bidirectional signal translation without external resistors or dedicated level translators, preserving setup/hold margins.

Use Scenario: Implementing state registers in CPLD-based glue logic for memory-mapped peripheral interfaces.

IC Role / Device Role / Timing Role: Compact dual-register building block providing two bits of synchronous storage with independent control per bit.

Use Value: Reduces macrocell usage in small-form-factor programmable logic designs while maintaining full configurability of reset/set behavior.

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
SN74ACT74N	Same PDIP-14 package, identical electrical specs, but marked without E4 suffix - RoHS-compliant with NIPDAU finish vs. SN74ACT74NE4's legacy lead finish.	No functional difference; SN74ACT74N is RoHS-qualified replacement for new designs requiring compliance.	Select SN74ACT74N for RoHS-constrained production; SN74ACT74NE4 remains valid for legacy repair or non-RoHS environments.
SN74ACT74DR	SOIC-14 package (8.65 mm × 6 mm), same AC/DC specs, R_θJA = 119.9 °C/W - smaller footprint but higher thermal resistance than PDIP.	Suitable for space-constrained PCBs where through-hole mounting is not required; requires reflow soldering instead of wave soldering.	Choose SN74ACT74DR for surface-mount assembly lines; SN74ACT74NE4 preferred for prototyping, repair, or high-reliability through-hole applications.

Compared with SN74ACT74N and SN74ACT74DR, SN74ACT74NE4 offers legacy-compatible lead finish and through-hole mechanical robustness ideal for serviceable industrial hardware, while maintaining identical logic functionality and timing performance.

Availability

SN74ACT74NE4 is available at Aetrix Electronics and suitable for industrial control logic, digital instrumentation, and legacy system interface applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74ACT74NE4 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 ICs, with over 90 years of innovation in industrial, automotive, and communications markets.

SN74ACT74NE4 belongs to the ACT (Advanced CMOS Technology) logic family - designed for high-speed, low-power 5 V digital systems requiring TTL compatibility, robust noise immunity, and wide temperature operation.

FAQ

What is the maximum clock frequency supported by SN74ACT74NE4?

SN74ACT74NE4 supports a maximum clock frequency of 125 MHz under recommended operating conditions (V_CC = 4.5 V to 5.5 V, T_A = –40 °C to +85 °C). This is derived from its guaranteed maximum propagation delay of 10.5 ns and verified switching characteristics in the official TI datasheet SCAS520J. The SN74ACT74NE4 achieves this performance while maintaining full setup and hold timing margins.

Does SN74ACT74NE4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on SN74ACT74NE4 must be tied to a defined logic level (V_CC or GND) to prevent floating states that cause undefined outputs, increased power consumption, or oscillation. TI's layout guidelines explicitly prohibit leaving PRE, CLR, D, or CLK pins unconnected. The SN74ACT74NE4 has no internal weak pull-ups or pull-downs, so external biasing is mandatory for reliability.

Can SN74ACT74NE4 operate with a 3.3 V supply?

No - SN74ACT74NE4 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. Applying 3.3 V violates the minimum V_CC rating and will result in unreliable logic levels, degraded noise margins, and potential failure to meet timing specifications. For 3.3 V systems, consider the SN74LVC74A or SN74AUP1G74 families instead of SN74ACT74NE4.

What is the purpose of the exposed thermal pad in SN74ACT74NE4's package?

SN74ACT74NE4 does not have an exposed thermal pad - it uses a standard 14-pin PDIP (N) package with no thermal pad. The exposed pad reference applies only to the WQFN (BQA) variant (e.g., SN74ACT74BQAR). For SN74ACT74NE4, thermal management relies on PCB copper pour connected to pins 7 (GND) and 14 (V_CC), with R_θJA = 80 °C/W measured under JEDEC JESD51-2 conditions.

Is SN74ACT74NE4 pin-compatible with SN74LS74A?

SN74ACT74NE4 is functionally pin-compatible with SN74LS74A in the 14-pin PDIP package - both share identical pin assignments for CLK, D, PRE, CLR, Q, Q̅, V_CC, and GND. However, SN74ACT74NE4 offers superior speed (10.5 ns vs. 40 ns), higher drive strength (±24 mA vs. ±8 mA), and TTL-compatible inputs tolerant to 5.5 V, making it a direct performance upgrade where board layout permits.

SN74ACT74NE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

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:: 210 MHz

Max Propagation Delay @ V, Max CL:: 11ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 2 µA

Input Capacitance:: 3 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

SN74ACT74NE4 FAQ

1.How can I place an order for SN74ACT74NE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ACT74NE4 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 SN74ACT74NE4 reliable?

The price and inventory of SN74ACT74NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74NE4 is usually 5 days.

3.What payment methods are accepted for SN74ACT74NE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74NE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ACT74NE4?

SN74ACT74NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ACT74NE4 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 SN74ACT74NE4?

For technical support, including SN74ACT74NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74NE4 requirements.

6.How does Aetrix verify that SN74ACT74NE4 is sourced from the original manufacturer or authorized distributors?

All SN74ACT74NE4 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 SN74ACT74NE4 meets industry standards.

7.What is the process for return or replacement of SN74ACT74NE4?

All SN74ACT74NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74NE4, 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 SN74ACT74NE4 part is unused and in its original packaging.

Return procedure for SN74ACT74NE4:

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…