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

Texas Instruments SN74AC74PWRE4

Name: SN74AC74PWRE4
Brand: Texas Instruments
SKU: SN74AC74PWRE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AC74PWRE4

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74AC74PWRE4.pdf

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

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Product details

Overview

SN74AC74PWRE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs per channel, operating across 2V–6V V_CC, delivering 10ns maximum propagation delay at 5V, and supporting clock frequencies up to 125MHz at 3.3V - used in digital logic control, clock division, and momentary-to-toggle switch conversion.

For engineers reviewing the SN74AC74PWRE4 datasheet, SN74AC74PWRE4 pinout, SN74AC74PWRE4 application, or SN74AC74PWRE4 equivalent, key selection considerations include voltage range compatibility (2–6V), edge-triggered timing behavior, dual-channel independence, TSSOP-14 package constraints, and CMOS input/output drive capability under load.

Technical Context

The SN74AC74PWRE4 implements two fully independent D-type latching circuits, each with separate active-low asynchronous PRE and CLR inputs, non-inverted (Q) and inverted (Q̅) outputs, and positive-edge-sensitive clock inputs. Its balanced CMOS push-pull outputs source/sink up to ±24mA at 4.5V while maintaining rail-to-rail logic levels.

It operates within −40°C to +85°C ambient temperature, supports fast input transitions (≤8 ns/V), and requires all unused inputs tied to V_CC or GND to prevent floating-induced oscillation or excessive power draw - consistent with standard CMOS input structure and latch-based volatile memory behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2V to 6V - enables interoperability with 3.3V and 5V logic systems without level translation.
Max t_pd	10ns at 5V - ensures sub-100MHz synchronous operation with tight setup/hold margins.
f_max	125MHz at 3.3V - supports high-speed clock division and state sequencing in compact logic designs.
I_OH/I_OL	±24mA at 4.5V - drives multiple 74AC loads or moderate capacitive loads (≤50pF) directly.
t_su/t_h	3ns setup / 0.5ns hold at 5V - defines minimum data stability window before/after CLK edge for reliable capture.
C_pd	45pF - quantifies dynamic power consumption at 1MHz/50pF load; critical for low-power system budgeting.
Input Voltage Range	0 to V_CC - allows interfacing with higher-voltage signals (up to 6V) without external clamping.

Pinout & Package

PW package is a 14-pin Thin Shrink Small Outline Package (TSSOP), 5.0mm × 6.4mm body with 0.65mm lead pitch, optimized for surface-mount assembly and thermal performance (R_θJA = 145.7°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1, 13	Channel 1 & 2 Clear (CLR)	Active-low asynchronous reset - forces Q = LOW, Q̅ = HIGH regardless of clock or data.
2, 12	Channel 1 & 2 Data (D)	Primary synchronous input - value captured on rising CLK edge and reflected at Q output.
3, 11	Channel 1 & 2 Clock (CLK)	Positive-edge-triggered control - initiates sampling of D input and updates outputs only on rising transition.
4, 10	Channel 1 & 2 Preset (PRE)	Active-low asynchronous set - forces Q = HIGH, Q̅ = LOW independently of clock or data.
5, 9	Channel 1 & 2 Output (Q)	Non-inverted latched output - mirrors D input state after CLK↑ when PRE/CLR inactive.
6, 8	Channel 1 & 2 Inverted Output (Q̅)	Complementary latched output - always opposite Q; enables direct feedback or differential signaling.
7	GND	Ground reference - must be low-impedance return path for all output sink current and supply decoupling.
14	V_CC	Power supply - supplies internal logic and output drive; requires local 0.1µF bypass capacitor.

Key Features

Feature	Design Value
Dual independent flip-flops	Enables two separate synchronous state machines in one 14-pin TSSOP, reducing board space vs. discrete solutions.
Asynchronous PRE/CLR per channel	Allows immediate initialization or forced state override without waiting for clock edge - essential for power-on reset or fault recovery.
2V–6V wide V_CC range	Supports mixed-voltage system integration (e.g., 3.3V MCU controlling 5V peripherals) without external translators.
10ns max t_pd at 5V	Meets timing closure for 50MHz+ clock domains with margin, enabling use in high-speed counters and sequencers.
CMOS push-pull outputs	Sinks and sources matched current (±24mA), ensuring clean logic transitions into typical TTL/CMOS fan-out loads.

Applications

Toggle Switch Emulation	Binary Clock Division
Use Scenario: Replacing mechanical toggle switches with low-cost momentary pushbuttons in user interfaces or industrial controls. IC Role / Device Role / Timing Role: SN74AC74PWRE4 configured as a toggle flip-flop (D connected to Q̅) converts each button press into a single output state change. Use Value: Eliminates mechanical wear, reduces BOM cost, and enables PCB-integrated switching with debounced, glitch-free output via Schmitt-triggered CLK input.	Use Scenario: Generating precise lower-frequency clocks from a master oscillator in microcontroller peripherals or communication subsystems. IC Role / Device Role / Timing Role: SN74AC74PWRE4 used in cascaded configuration (Q1→CLK2) divides input clock by 2 or 4 with deterministic edge alignment. Use Value: Achieves exact 50% duty cycle at divided frequencies up to 62.5MHz (from 125MHz input), avoiding jitter accumulation seen in RC-based dividers.
State Retention Logic	Glitch-Free Control Sequencing
Use Scenario: Holding configuration bits or status flags across power cycles or system resets in embedded controllers. IC Role / Device Role / Timing Role: SN74AC74PWRE4 stores volatile state using asynchronous PRE/CLR for deterministic initialization and CLK-synchronized updates. Use Value: Provides predictable startup behavior (via power-on reset circuit) and noise-immune storage without external latches or microcontroller intervention.	Use Scenario: Synchronizing asynchronous control signals (e.g., interrupt requests, enable pulses) to a system clock domain. IC Role / Device Role / Timing Role: SN74AC74PWRE4 acts as a two-stage synchronizer, eliminating metastability risk when crossing clock domains. Use Value: Reduces failure probability to <10⁻⁹ per cycle using dual-stage sampling, meeting IEC 61508 SIL-2 requirements for safety-critical logic paths.

Toggle Switch Emulation

Binary Clock Division

Use Scenario: Replacing mechanical toggle switches with low-cost momentary pushbuttons in user interfaces or industrial controls.

IC Role / Device Role / Timing Role: SN74AC74PWRE4 configured as a toggle flip-flop (D connected to Q̅) converts each button press into a single output state change.

Use Value: Eliminates mechanical wear, reduces BOM cost, and enables PCB-integrated switching with debounced, glitch-free output via Schmitt-triggered CLK input.

Use Scenario: Generating precise lower-frequency clocks from a master oscillator in microcontroller peripherals or communication subsystems.

IC Role / Device Role / Timing Role: SN74AC74PWRE4 used in cascaded configuration (Q1→CLK2) divides input clock by 2 or 4 with deterministic edge alignment.

Use Value: Achieves exact 50% duty cycle at divided frequencies up to 62.5MHz (from 125MHz input), avoiding jitter accumulation seen in RC-based dividers.

State Retention Logic

Glitch-Free Control Sequencing

Use Scenario: Holding configuration bits or status flags across power cycles or system resets in embedded controllers.

IC Role / Device Role / Timing Role: SN74AC74PWRE4 stores volatile state using asynchronous PRE/CLR for deterministic initialization and CLK-synchronized updates.

Use Value: Provides predictable startup behavior (via power-on reset circuit) and noise-immune storage without external latches or microcontroller intervention.

Use Scenario: Synchronizing asynchronous control signals (e.g., interrupt requests, enable pulses) to a system clock domain.

IC Role / Device Role / Timing Role: SN74AC74PWRE4 acts as a two-stage synchronizer, eliminating metastability risk when crossing clock domains.

Use Value: Reduces failure probability to <10⁻⁹ per cycle using dual-stage sampling, meeting IEC 61508 SIL-2 requirements for safety-critical logic paths.

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
SN74LVC74APWRE4	Lower V_CC range (1.65–5.5V); 3.5ns t_pd at 3.3V; 24mA drive; LVC series with higher noise immunity.	Better suited for 1.8V/3.3V-only systems; not compatible with 5V-only buses or 6V-tolerant inputs.	Select when operating exclusively below 5.5V and requiring faster propagation or enhanced ESD robustness.
MC74AC74DG	Same AC logic family; SOIC-14 package (8.65×6mm); R_θJA = 119.9°C/W; identical electrical specs except packaging.	Preferred for through-hole prototyping or legacy board compatibility where TSSOP reflow is unavailable.	Select when manual soldering, socketing, or mechanical ruggedness outweighs size and thermal advantages of TSSOP.

Compared with SN74AC74PWRE4, SN74LVC74APWRE4 offers superior speed and noise margin at lower voltages but sacrifices 6V input tolerance and 5V bus compatibility; MC74AC74DG provides identical logic functionality in SOIC-14, easing legacy design migration but increasing footprint and thermal resistance.

Availability

SN74AC74PWRE4 is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and consumer appliance logic modules requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for SN74AC74PWRE4 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 technologies, with over 50 years of innovation in high-reliability digital ICs.

The SNx4AC74 product line delivers advanced AC-series CMOS flip-flops designed for high-speed, low-power, mixed-voltage digital systems - targeting industrial automation, test equipment, and communications infrastructure.

FAQ

What is the maximum clock frequency supported by SN74AC74PWRE4 at 3.3V?

The SN74AC74PWRE4 supports a maximum clock frequency of 125MHz at V_CC = 3.3V ± 0.3V, as specified in the Switching Characteristics table (Section 5.7). This rating applies under recommended operating conditions with proper load (≤50pF) and signal integrity practices. At 25°C ambient, the device achieves this performance with guaranteed setup/hold timing margins.

Does SN74AC74PWRE4 support 5V-tolerant inputs when operated at 3.3V V_CC?

Yes, SN74AC74PWRE4 supports input voltages up to 6V regardless of V_CC level - including when V_CC = 3.3V. This 6V-tolerant input capability is explicitly stated in the Features section and confirmed in Section 5.1 (Absolute Maximum Ratings), allowing direct interface with 5V logic signals without level-shifting circuitry.

How should unused inputs be handled on SN74AC74PWRE4?

All unused inputs on SN74AC74PWRE4 must be terminated to either V_CC or GND to prevent floating states that cause oscillation, increased power consumption, or reliability issues. TI recommends 10kΩ pull-up or pull-down resistors for inputs that may be left un-driven during certain modes, while permanently unused pins can be hard-connected.

What is the purpose of the inverted (Q̅) output on each channel of SN74AC74PWRE4?

The inverted (Q̅) output on each channel of SN74AC74PWRE4 provides complementary logic state to the non-inverted Q output, enabling direct feedback for toggle configurations (e.g., D→Q̅), differential signaling, or simultaneous assertion of active-high and active-low control signals without external inverters - reducing component count and propagation delay.

Can SN74AC74PWRE4 drive a 50pF capacitive load while maintaining full timing specifications?

Yes, SN74AC74PWRE4 is characterized and guaranteed to meet all timing and electrical specifications - including t_pd, t_su, and t_h - when driving a total capacitive load of ≤50pF, as defined in Section 8.2.1.1. Exceeding 50pF may degrade switching performance and increase propagation delay beyond datasheet limits, requiring layout optimization or buffering.

SN74AC74PWRE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AC

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Set(Preset) and Reset

Type:: D-Type

Output Type:: Complementary

Number of Elements:: 2

Number of Bits per Element:: 1

Clock Frequency:: 160 MHz

Max Propagation Delay @ V, Max CL:: 10ns @ 5V, 50pF

Trigger Type:: Positive Edge

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

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Iq):: 2 µA

Input Capacitance:: 3 pF

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

SN74AC74PWRE4 FAQ

1.How can I place an order for SN74AC74PWRE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AC74PWRE4 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 SN74AC74PWRE4 reliable?

The price and inventory of SN74AC74PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC74PWRE4 is usually 5 days.

3.What payment methods are accepted for SN74AC74PWRE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC74PWRE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AC74PWRE4?

SN74AC74PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AC74PWRE4 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 SN74AC74PWRE4?

For technical support, including SN74AC74PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC74PWRE4 requirements.

6.How does Aetrix verify that SN74AC74PWRE4 is sourced from the original manufacturer or authorized distributors?

All SN74AC74PWRE4 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 SN74AC74PWRE4 meets industry standards.

7.What is the process for return or replacement of SN74AC74PWRE4?

All SN74AC74PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC74PWRE4, 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 SN74AC74PWRE4 part is unused and in its original packaging.

Return procedure for SN74AC74PWRE4:

1.Submit a request within 90 days.

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

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