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

Texas Instruments SN74HC273DWRG4

Name: SN74HC273DWRG4
Brand: Texas Instruments
SKU: SN74HC273DWRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74HC273DWRG4

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74HC273DWRG4.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SOIC

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Product details

Overview

SN74HC273DWRG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with active-low asynchronous clear, operating across 2 V to 6 V. It delivers 12 ns typical propagation delay at 5 V, ±4 mA output drive, and 80 µA maximum supply current-enabling reliable data latching in digital control logic, bus interface buffers, and synchronous state machines.

For engineers reviewing the SN74HC273DWRG4 datasheet, SN74HC273DWRG4 pinout, SN74HC273DWRG4 application, or SN74HC273DWRG4 equivalent, this page provides verified functional identity, SOIC-20 package mapping, timing-critical parameters (t_pd, t_su, f_max), and validated alternative options for industrial logic design and register-level signal synchronization.

Technical Context

The SN74HC273DWRG4 implements eight independent D flip-flops sharing a common clock (CLK) and global active-low clear (CLR) input. Each flip-flop captures data on the rising edge of CLK while CLR forces all Q outputs low asynchronously-no clock dependency required for reset.

It uses silicon-gate CMOS technology with balanced output drive, supports 10 LSTTL loads per output, and maintains stable operation across –40°C to +85°C ambient temperature. Input thresholds scale with V_CC, and internal circuitry ensures no output change when CLK is held high or low.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	High-speed CMOS (74HC), compatible with TTL input levels and 5 V systems
Supply Voltage Range	2 V to 6 V - enables direct integration into mixed-voltage 3.3 V and 5 V digital subsystems
Propagation Delay (t_pd)	Typical 12 ns at V_CC = 5 V, CL = 50 pF - supports >21 MHz clock operation in synchronous logic
Output Drive	±4 mA at V_CC = 5 V - sufficient to directly drive 10 LSTTL inputs without buffering
Quiescent Current (I_CC)	Max 80 µA at V_CC = 6 V - enables low-power retention in battery-backed or energy-sensitive applications
Input Leakage Current	Max ±1 µA - prevents unintended logic transitions due to floating or weakly driven inputs
Setup Time (t_su)	25 ns at V_CC = 4.5 V - defines minimum data stability window before CLK rising edge

Pinout & Package

SN74HC273DWRG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.050″ (1.27 mm) lead pitch and RoHS-compliant NiPdAu lead finish. The package is moisture sensitivity level (MSL) 1, rated for peak reflow up to 260°C.

Pin/Terminal	Circuit Role	Design Meaning
1 (CLR)	Active-low asynchronous clear input	Forces all eight Q outputs low immediately, independent of CLK state or timing
2–9, 12, 15–19 (Q1–Q8, D1–D8)	Single-rail outputs and individual data inputs	Each D input controls its corresponding Q output; no shared data bus or internal multiplexing
10 (GND)	Ground reference	Common return path for all internal logic and output current sinks
11 (CLK)	Positive-edge-triggered clock input	Transfers data from D_n to Q_n only on rising edge; insensitive to pulse width or transition rate
20 (V_CC)	Power supply	Supplies core logic and output drivers; requires local 0.1 µF bypass capacitor per TI layout guidelines

Key Features

Feature	Design Value
Octal D-type flip-flop architecture	Eight independent storage elements in one IC-reduces board space vs. discrete flip-flop solutions
Asynchronous active-low clear	Enables deterministic system-wide reset without waiting for clock edges or cycle alignment
Wide V_CC range (2–6 V)	Supports interoperability between 3.3 V microcontrollers and 5 V legacy peripherals without level shifters
Low dynamic power consumption	35 pF typical power dissipation capacitance per flip-flop minimizes switching current in high-frequency use
CMOS input compatibility	Input leakage ≤1 µA allows direct connection to open-drain or high-impedance sources without pull-up loading

Applications

Industrial Control Logic	Digital Bus Interface
Use Scenario: Synchronizing sensor readouts and actuator commands in PLC I/O modules. IC Role / Device Role / Timing Role: Acts as a clocked input latch and output register, isolating noisy field-side signals from clean controller-side logic. Use Value: Prevents metastability during asynchronous signal capture using controlled setup/hold timing and robust noise margins.	Use Scenario: Buffering address/data lines between microcontroller and external memory or peripheral ICs. IC Role / Device Role / Timing Role: Provides registered data staging to meet memory access timing windows and reduce bus contention. Use Value: Enables reliable 8-bit parallel transfers at up to 21 MHz with guaranteed t_pd and t_su compliance.
Pattern Generation	Synchronous State Machine
Use Scenario: Generating fixed test sequences for automated PCB functional testing. IC Role / Device Role / Timing Role: Stores and clocks out predefined bit patterns via cascaded or parallel D inputs. Use Value: Delivers deterministic, jitter-free waveform edges with <13 ns max t_pd variation over voltage and temperature.	Use Scenario: Implementing finite-state logic for motor commutation or protocol encoding in embedded systems. IC Role / Device Role / Timing Role: Holds current state bits and updates on each system clock edge under control of combinational next-state logic. Use Value: Supports glitch-free state transitions with simultaneous update of all eight bits via shared CLK and CLR.

Industrial Control Logic

Digital Bus Interface

Use Scenario: Synchronizing sensor readouts and actuator commands in PLC I/O modules.

IC Role / Device Role / Timing Role: Acts as a clocked input latch and output register, isolating noisy field-side signals from clean controller-side logic.

Use Value: Prevents metastability during asynchronous signal capture using controlled setup/hold timing and robust noise margins.

Use Scenario: Buffering address/data lines between microcontroller and external memory or peripheral ICs.

IC Role / Device Role / Timing Role: Provides registered data staging to meet memory access timing windows and reduce bus contention.

Use Value: Enables reliable 8-bit parallel transfers at up to 21 MHz with guaranteed t_pd and t_su compliance.

Pattern Generation

Synchronous State Machine

Use Scenario: Generating fixed test sequences for automated PCB functional testing.

IC Role / Device Role / Timing Role: Stores and clocks out predefined bit patterns via cascaded or parallel D inputs.

Use Value: Delivers deterministic, jitter-free waveform edges with <13 ns max t_pd variation over voltage and temperature.

Use Scenario: Implementing finite-state logic for motor commutation or protocol encoding in embedded systems.

IC Role / Device Role / Timing Role: Holds current state bits and updates on each system clock edge under control of combinational next-state logic.

Use Value: Supports glitch-free state transitions with simultaneous update of all eight bits via shared CLK and CLR.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT273DWR	TTL-compatible input thresholds (VIH = 2 V min), otherwise identical pinout, timing, and drive	Better suited for mixed 5 V TTL/CMOS systems where input noise immunity must match legacy TTL logic levels	Select when interfacing directly with 74LS or 74F series outputs without level translation
74AC273SCX	Faster t_pd (5.5 ns typ at 5 V), higher ICC (40 mA max), wider V_CC range (2–6 V), same SOIC-20 footprint	Higher speed and drive support demanding timing-critical designs but increase power and EMI concerns	Choose when >25 MHz operation or stronger fanout (>20 LSTTL) is required, with thermal management allowance

Compared with SN74HC273DWRG4, SN74HCT273DWR offers improved input compatibility with older TTL families, while 74AC273SCX trades higher power for significantly faster switching-making SN74HC273DWRG4 optimal for cost-sensitive, low-power 3.3/5 V logic where 21 MHz operation suffices.

Availability

SN74HC273DWRG4 is available at Aetrix Electronics and suitable for industrial control logic, digital bus interface, pattern generation, and synchronous state machine applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for SN74HC273DWRG4 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 decades of heritage in industry-standard logic families including 74HC, 74HCT, and 74AC.

SN74HC273DWRG4 belongs to TI's 74HC logic portfolio-designed for low-power, high-noise-immunity digital interfacing and data registration in industrial, automotive, and communications equipment.

FAQ

What is the maximum clock frequency supported by SN74HC273DWRG4?

The SN74HC273DWRG4 supports a maximum clock frequency of 25 MHz at V_CC = 6 V and 21 MHz at V_CC = 4.5 V over its full operating temperature range (–40°C to +85°C). These values derive from verified timing requirements in the official TI datasheet revision F (April 2022), ensuring reliable edge-triggered operation without setup/hold violations.

Does SN74HC273DWRG4 require external pull-up resistors on unused inputs?

Yes-TI explicitly requires all unused inputs of SN74HC273DWRG4 to be tied to either V_CC or GND to prevent floating states that cause undefined outputs, increased power consumption, or potential latch-up. This is mandated in Section 6.3 and reinforced in Layout Guidelines (Section 11.1) of the SN74HC273 datasheet.

Is SN74HC273DWRG4 pin-compatible with SN74HCT273DWR?

Yes-SN74HC273DWRG4 and SN74HCT273DWR share identical SOIC-20 pinout, terminal functions, and mechanical dimensions. The only functional difference is input voltage thresholds: HCT versions accept TTL-level highs (≥2 V), while HC versions require CMOS-level highs (≥70% V_CC). No PCB changes are needed for substitution.

What is the recommended bypass capacitor for SN74HC273DWRG4?

Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the V_CC (pin 20) and GND (pin 10) terminals of SN74HC273DWRG4. This mitigates high-frequency supply noise and transient current spikes during output switching, as specified in Section 10 (Power Supply Recommendations) of the datasheet.

Can SN74HC273DWRG4 drive LED indicators directly?

No-SN74HC273DWRG4 outputs are not designed for direct LED driving. Its ±4 mA drive capability at 5 V is insufficient for typical indicator LEDs (requiring 10–20 mA), and sustained DC current risks exceeding absolute maximum ratings. Use a dedicated driver transistor or buffer IC like ULN2003 for LED loads.

SN74HC273DWRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74HC

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Function:: Master Reset

Type:: D-Type

Output Type:: Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 60 MHz

Max Propagation Delay @ V, Max CL:: 27ns @ 6V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 5.2mA, 5.2mA

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Iq):: 8 µA

Input Capacitance:: 3 pF

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74HC273DWRG4 FAQ

1.How can I place an order for SN74HC273DWRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74HC273DWRG4 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 SN74HC273DWRG4 reliable?

The price and inventory of SN74HC273DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC273DWRG4 is usually 5 days.

3.What payment methods are accepted for SN74HC273DWRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC273DWRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74HC273DWRG4?

SN74HC273DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74HC273DWRG4 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 SN74HC273DWRG4?

For technical support, including SN74HC273DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC273DWRG4 requirements.

6.How does Aetrix verify that SN74HC273DWRG4 is sourced from the original manufacturer or authorized distributors?

All SN74HC273DWRG4 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 SN74HC273DWRG4 meets industry standards.

7.What is the process for return or replacement of SN74HC273DWRG4?

All SN74HC273DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC273DWRG4, 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 SN74HC273DWRG4 part is unused and in its original packaging.

Return procedure for SN74HC273DWRG4:

1.Submit a request within 90 days.

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

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