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

Texas Instruments SN74HCT273APW

Name: SN74HCT273APW
Brand: Texas Instruments
SKU: SN74HCT273APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74HCT273APW

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74HCT273APW.pdf

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

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Product details

Overview

SN74HCT273APW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), designed for synchronous data latching in digital control and interface circuits. It operates at 4.5 V to 5.5 V, supports −40 °C to +125 °C ambient range, features TTL-compatible inputs, and delivers 4.0 mA output drive at V_CC = 4.5 V - used in microcontroller I/O expansion and bus interface buffering.

For engineers reviewing the SN74HCT273APW datasheet, SN74HCT273APW pinout, SN74HCT273APW application, or SN74HCT273APW equivalent, key selection criteria include its 16 ns typical propagation delay (CP to Q), 12 ns minimum clock pulse width, 15 ns setup time, and TSSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The SN74HCT273APW implements eight independent D-type flip-flops sharing a common clock (CP) and active-low master reset (MR). Its TTL-level input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V at V_CC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V logic families without level shifting. All outputs are push-pull with symmetrical sourcing/sinking capability.

It complies with JEDEC standard JESD7A and supports operation across industrial and extended temperature ranges (−40 °C to +125 °C). Input clamp diodes allow safe interfacing to voltages exceeding V_CC when current-limiting resistors are used - critical for mixed-voltage system integration.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	HCT - TTL-compatible input thresholds enable direct connection to 5 V microcontrollers and legacy logic without level shifters.
Supply Voltage Range	4.5 V to 5.5 V - matches standard 5 V system rails; not rated for 3.3 V operation.
Propagation Delay (CP→Q)	16 ns typical at V_CC = 4.5 V, CL = 50 pF - determines maximum synchronous data throughput in latch chains.
Output Drive Strength	±4.0 mA at V_CC = 4.5 V - sufficient to drive multiple 74-series inputs or small capacitive loads (< 50 pF).
Input Clamp Diodes	Present on all inputs - permits safe overvoltage tolerance (e.g., 12 V signals with series resistor) without external protection.
Operating Temperature	−40 °C to +125 °C - qualified for under-hood automotive, industrial motor control, and power supply monitoring applications.
ESD Rating	HBM > 2000 V, MM > 200 V - meets industrial handling requirements per JESD22-A114F/A115-A.

Pinout & Package

TSSOP-20 package (SOT-360-1): plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1	MR	Active-low master reset - forces all Q outputs LOW regardless of clock or data state; requires pull-up for normal operation.
2, 5, 6, 9, 12, 15, 16, 19	Q0–Q7	Eight registered outputs - retain latched D-input values until next CP edge or MR assertion.
3, 4, 7, 8, 13, 14, 17, 18	D0–D7	Eight asynchronous data inputs - sampled on LOW-to-HIGH CP transition if setup/hold times met.
10	GND	Ground reference - must be low-impedance connection; shared return for all internal logic and I/O.
11	CP	Clock input - edge-sensitive; only LOW-to-HIGH transitions trigger register update; minimum pulse width 16 ns.
20	V_CC	Positive supply - decoupling capacitor (100 nF ceramic) required within 10 mm of pin for noise immunity.

Key Features

Feature	Design Value
TTL-compatible inputs	Accepts standard 5 V TTL logic levels (0.8 V/2.0 V thresholds), eliminating need for external level translators in 5 V systems.
Common clock & reset	Single CP and MR control all eight flip-flops - simplifies timing control and enables synchronized state clearing across parallel data paths.
Input clamp diodes	Enable robust interfacing to voltages > V_CC (e.g., 12 V sensors) using simple series current-limiting resistors - reduces BOM count.
JEDEC JESD7A compliance	Guarantees interoperability with other JEDEC-standard 74-series logic devices in mixed-manufacturer designs.
Extended temperature range	Rated for −40 °C to +125 °C operation - suitable for engine control units, industrial PLC I/O modules, and power converter feedback latches.

Applications

Microcontroller I/O Expansion	Parallel Bus Interface Latching
Use Scenario: Expanding GPIO count of an MSP430 or STM32 MCU by latching 8-bit parallel data from peripheral registers. IC Role / Device Role / Timing Role: Synchronous data capture element - holds peripheral status or command bits stable during MCU read cycles. Use Value: Enables deterministic timing between MCU clock domain and slower peripherals; eliminates metastability risk via controlled edge-triggered sampling.	Use Scenario: Capturing address/data bus states in legacy 8-bit microprocessor systems (e.g., Z80, 8085) during memory-mapped I/O operations. IC Role / Device Role / Timing Role: Address latch - freezes bus contents at precise clock edge to meet memory access setup/hold windows. Use Value: Provides clean, glitch-free address hold with 16 ns propagation delay - ensures reliable SRAM or peripheral chip select timing.
Industrial Sensor Data Capture	LED Display Row/Column Driver Control
Use Scenario: Sampling analog-to-digital converter outputs or discrete sensor status bits in programmable logic controllers. IC Role / Device Role / Timing Role: Digital input synchronizer - aligns asynchronous sensor signals to system clock domain before processing. Use Value: Prevents metastability-induced logic errors in safety-critical control loops; MR pin allows hardware-initiated fault recovery.	Use Scenario: Driving multiplexed 7-segment or dot-matrix LED displays where row/column enable signals must be held stable for display persistence. IC Role / Device Role / Timing Role: Static output latch - maintains segment drive states while display controller refreshes other rows. Use Value: Eliminates visible flicker by guaranteeing consistent output voltage (≤0.26 V VOL at 4 mA) across all eight segments.

Microcontroller I/O Expansion

Parallel Bus Interface Latching

Use Scenario: Expanding GPIO count of an MSP430 or STM32 MCU by latching 8-bit parallel data from peripheral registers.

IC Role / Device Role / Timing Role: Synchronous data capture element - holds peripheral status or command bits stable during MCU read cycles.

Use Value: Enables deterministic timing between MCU clock domain and slower peripherals; eliminates metastability risk via controlled edge-triggered sampling.

Use Scenario: Capturing address/data bus states in legacy 8-bit microprocessor systems (e.g., Z80, 8085) during memory-mapped I/O operations.

IC Role / Device Role / Timing Role: Address latch - freezes bus contents at precise clock edge to meet memory access setup/hold windows.

Use Value: Provides clean, glitch-free address hold with 16 ns propagation delay - ensures reliable SRAM or peripheral chip select timing.

Industrial Sensor Data Capture

LED Display Row/Column Driver Control

Use Scenario: Sampling analog-to-digital converter outputs or discrete sensor status bits in programmable logic controllers.

IC Role / Device Role / Timing Role: Digital input synchronizer - aligns asynchronous sensor signals to system clock domain before processing.

Use Value: Prevents metastability-induced logic errors in safety-critical control loops; MR pin allows hardware-initiated fault recovery.

Use Scenario: Driving multiplexed 7-segment or dot-matrix LED displays where row/column enable signals must be held stable for display persistence.

IC Role / Device Role / Timing Role: Static output latch - maintains segment drive states while display controller refreshes other rows.

Use Value: Eliminates visible flicker by guaranteeing consistent output voltage (≤0.26 V VOL at 4 mA) across all eight segments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HCT273D	SO-20 package (7.5 mm width); identical electrical specs and pinout; higher thermal resistance than TSSOP.	Suitable for through-hole or larger footprint designs where board space is less constrained.	Choose when manual soldering or rework accessibility is prioritized over density.
SN74HCT374PWR	Octal D-type transparent latch (3-state outputs); different function (latch vs. flip-flop); no MR pin; 3-state enable instead.	Used where bus isolation or bidirectional data flow is required, not pure edge-triggered storage.	Select only if 3-state capability and latch behavior (not edge-triggered) match system architecture.

Compared with 74HCT273D and SN74HCT374PWR, the SN74HCT273APW offers the smallest PCB footprint (TSSOP-20), identical timing and drive performance to the SO-20 variant, and provides true asynchronous reset - making it optimal for space-constrained, high-reliability synchronous latch applications.

Availability

SN74HCT273APW is available at Aetrix Electronics and suitable for industrial automation, automotive control modules, and embedded instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HCT273APW 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The SN74HCT273APW belongs to TI's 74HCT logic family, engineered for robust 5 V TTL-compatible operation in harsh environments - targeting applications demanding noise immunity, wide temperature tolerance, and drop-in replacement capability for legacy 74-series designs.

FAQ

What is the maximum clock frequency supported by the SN74HCT273APW?

The SN74HCT273APW supports a maximum clock frequency of 24 MHz at V_CC = 4.5 V and −40 °C to +85 °C ambient, and 20 MHz across the full −40 °C to +125 °C range. This is derived from its 16 ns typical propagation delay and 12 ns minimum clock pulse width, ensuring reliable edge-triggered operation in high-speed synchronous logic systems.

Does the SN74HCT273APW support 3.3 V operation?

No, the SN74HCT273APW does not support 3.3 V operation. Its recommended supply voltage range is strictly 4.5 V to 5.5 V, and its TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) are specified only for V_CC = 4.5–5.5 V. Operating below 4.5 V may result in undefined logic behavior or failure to meet timing specifications.

How is the master reset (MR) pin used in the SN74HCT273APW?

The MR pin on the SN74HCT273APW is an active-low asynchronous reset that forces all Q0–Q7 outputs LOW immediately, independent of the clock signal or D-input states. It must be pulled HIGH (typically via 10 kΩ resistor to V_CC) during normal operation. A transient LOW on MR overrides all clocked behavior - essential for system initialization and fault recovery in safety-critical designs.

Can the SN74HCT273APW drive LEDs directly?

The SN74HCT273APW can drive low-current LEDs (≤4 mA per output) with appropriate current-limiting resistors, leveraging its ±4.0 mA output drive at V_CC = 4.5 V. However, it is not optimized for continuous LED current sinking; for higher-brightness or multi-LED applications, dedicated LED drivers or buffer ICs are recommended to maintain output voltage margins and thermal stability.

What package type is used for the SN74HCT273APW?

SN74HCT273APW uses the TSSOP-20 (Thin Shrink Small Outline Package) with 20 leads, 0.65 mm lead pitch, and 4.4 mm body width (SOT-360-1). This surface-mount package enables high-density PCB layouts and is compatible with standard reflow soldering processes, but requires careful stencil design and inspection due to fine-pitch gull-wing leads.

SN74HCT273APW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74HCT

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

Function:: Master Reset

Type:: D-Type

Output Type:: Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 75 MHz

Max Propagation Delay @ V, Max CL:: 27ns @ 5.5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 4mA, 4mA

Voltage - Supply:: 4.5V ~ 5.5V

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-TSSOP

SN74HCT273APW FAQ

1.How can I place an order for SN74HCT273APW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74HCT273APW 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 SN74HCT273APW reliable?

The price and inventory of SN74HCT273APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT273APW is usually 5 days.

3.What payment methods are accepted for SN74HCT273APW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT273APW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74HCT273APW?

SN74HCT273APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74HCT273APW 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 SN74HCT273APW?

For technical support, including SN74HCT273APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT273APW requirements.

6.How does Aetrix verify that SN74HCT273APW is sourced from the original manufacturer or authorized distributors?

All SN74HCT273APW 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 SN74HCT273APW meets industry standards.

7.What is the process for return or replacement of SN74HCT273APW?

All SN74HCT273APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT273APW, 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 SN74HCT273APW part is unused and in its original packaging.

Return procedure for SN74HCT273APW:

1.Submit a request within 90 days.

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

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