SN74HC273NG4 Equivalent & Substitute Parts

Part Overview

The SN74HC273NG4 is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as a master reset flip-flop with non-inverted output, designed for digital logic applications requiring synchronous data storage and control. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SN74HC273NG4

Texas InstrumentsIn Stock: 785SN74HC273NG4 Datasheet

Current PartRFQ

TC74HC273APF

Toshiba Semiconductor and StorageIn Stock: 905TC74HC273APF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC273NG4 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Series: 74HC (CMOS logic family compatibility)
• Type: D-Type Flip-Flop with 1 element, 8-bit configuration
• Trigger Type: Positive Edge
• Output Type: Non-Inverted
• Package: 20-DIP (0.300", 7.62mm) form factor
• Voltage Supply Range: 2V to 6V minimum overlap
• Operating Temperature: -40°C to 85°C minimum coverage
• Mounting Type: Through Hole

Acceptable Parameter Variations:

• Clock Frequency: Equal to or greater than 60 MHz
• Max Propagation Delay: Equal to or less than 27 ns @ 6V, 50pF
• Current Output High/Low: Equal to or less than 5.2 mA
• Quiescent Current (Iq): Equal to or less than 8 µA
• Input Capacitance: Equal to or less than 3 pF

The TC74HC273APF meets all critical matching parameters and acceptable variations, qualifying as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The TC74HC273APF is a qualified substitute for the SN74HC273NG4 based on the following engineering criteria:

Functional Equivalence: Both parts belong to the 74HC logic family and share identical D-Type flip-flop architecture with 1 element and 8-bit configuration. Pin-to-pin compatibility is maintained through identical 20-DIP packaging.

Performance Characteristics: The TC74HC273APF demonstrates superior performance metrics, with a clock frequency of 66 MHz (exceeding the 60 MHz specification) and reduced propagation delay of 25 ns (below the 27 ns maximum). Quiescent current consumption is lower at 4 µA compared to 8 µA, providing improved power efficiency.

Compliance and Certification: Both parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and identical operating temperature ranges of -40°C to 85°C. Voltage supply specifications are identical at 2V to 6V.

Availability and Status: The TC74HC273APF is currently active in production with 855 pieces in stock, addressing the discontinuation status of the original SN74HC273NG4.

Frequently Asked Questions (FAQ)

Q: Can the TC74HC273APF be used as a direct replacement for the SN74HC273NG4 in existing designs?

A: Yes. Both parts are 20-DIP through-hole packages with identical pinouts, voltage supply ranges (2V to 6V), operating temperature ranges (-40°C to 85°C), and D-Type flip-flop functionality with 8-bit capacity and positive edge triggering. No circuit modifications are required.

Q: What are the key differences between these two parts?

A: The TC74HC273APF offers improved performance with a higher clock frequency (66 MHz vs. 60 MHz), faster propagation delay (25 ns vs. 27 ns), and lower quiescent current (4 µA vs. 8 µA). Input capacitance is slightly higher at 5 pF compared to 3 pF. The Toshiba part is currently in active production, while the Texas Instruments part is discontinued.

Q: Are there any package or mounting differences?

A: No. Both parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging and are mounted using the same PCB footprint and assembly process.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74HC273NG4 and TC74HC273APF are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings.

Q: Which part should be selected for new designs?

A: The TC74HC273APF is the appropriate choice for new designs due to its active production status, superior performance specifications, and improved power efficiency characteristics.