SN74HC374NS Equivalent & Substitute Parts

Part Overview

The SN74HC374NS is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, designed for 8-bit parallel data storage and transfer applications. This component features tri-state, non-inverted outputs and operates across a 2V to 6V supply voltage range with a maximum propagation delay of 31ns at 6V with 50pF load. The SN74HC374NS is currently discontinued at DiGi Electronics, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Base Product Number	74HC374
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	70 MHz
Max Propagation Delay @ 6V, 50pF	31 ns
Trigger Type	Positive Edge
Voltage - Supply	2V ~ 6V
Current - Output High, Low	7.8 mA, 7.8 mA
Current - Quiescent (Iq)	8 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HC374NS is determined by strict equivalence across all electrical and mechanical parameters. The primary substitute identified is the SN74HC374NSR, which maintains identical functional specifications, electrical performance characteristics, and physical packaging. Both parts share the same base product number (74HC374), manufacturer (Texas Instruments), and are classified within the 74HC logic series.

The substitution is valid based on the following criteria:

Identical D-Type flip-flop architecture with 8-bit configuration
Matching tri-state, non-inverted output configuration
Equivalent clock frequency (70 MHz) and propagation delay (31ns @ 6V, 50pF)
Identical supply voltage range (2V ~ 6V)
Matching output current specifications (7.8mA high and low)
Identical quiescent current (8 µA)
Same 20-SOIC package footprint and surface mount mounting type
Equivalent environmental and compliance certifications (ROHS3, MSL 1)

Parameter Comparison

Parameter	SN74HC374NS	SN74HC374NSR	Match
Manufacturer	Texas Instruments	Texas Instruments	Yes
Base Product Number	74HC374	74HC374	Yes
Type	D-Type	D-Type	Yes
Number of Elements	1	1	Yes
Number of Bits per Element	8	8	Yes
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Yes
Clock Frequency	70 MHz	70 MHz	Yes
Max Propagation Delay @ 6V, 50pF	31 ns	31 ns	Yes
Trigger Type	Positive Edge	Positive Edge	Yes
Voltage - Supply	2V ~ 6V	2V ~ 6V	Yes
Current - Output High, Low	7.8 mA, 7.8 mA	7.8 mA, 7.8 mA	Yes
Current - Quiescent (Iq)	8 µA	8 µA	Yes
Input Capacitance	3 pF	3 pF	Yes
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Yes
Package / Case	20-SOIC (0.209", 5.30mm Width)	20-SOIC (0.209", 5.30mm Width)	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes
Product Status	Discontinued at DiGi Electronics	Active	Different
Packaging Format	Tube	Cut Tape (CT) & Digi-Reel®	Different

Engineering Selection Recommendations

The SN74HC374NSR is a direct functional equivalent to the SN74HC374NS and is suitable for replacement in all applications where the original part was specified. The primary distinction between these parts is product status and packaging format rather than electrical or mechanical performance.

The SN74HC374NS is discontinued at DiGi Electronics, whereas the SN74HC374NSR maintains active product status, ensuring ongoing availability and manufacturer support. Both parts carry identical ROHS3 compliance and MSL 1 ratings, confirming equivalent environmental and regulatory standing.

The packaging difference—tube format for the SN74HC374NS versus cut tape and Digi-Reel format for the SN74HC374NSR—reflects distribution channel variation and does not affect component functionality or performance. Selection between these parts should be based on current availability and packaging requirements for your procurement process.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC374NSR replace the SN74HC374NS in existing designs?

A: Yes. The SN74HC374NSR is electrically and mechanically equivalent to the SN74HC374NS. All functional parameters, electrical specifications, and package dimensions are identical. Direct substitution is appropriate for all applications.

Q: What is the difference between the SN74HC374NS and SN74HC374NSR?

A: The primary differences are product status and packaging format. The SN74HC374NS is discontinued and supplied in tube packaging, while the SN74HC374NSR is active and supplied in cut tape and Digi-Reel formats. Electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns with the 20-SOIC package?

A: No. Both parts use the identical 20-SOIC (0.209", 5.30mm Width) package footprint. PCB layout, solder pad dimensions, and component placement are fully compatible.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SN74HC374NS and SN74HC374NSR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Regulatory and environmental compliance is equivalent.

Q: What is the operating temperature range for these parts?

A: Both parts operate across -40°C to 85°C (TA). This range applies to all electrical specifications and performance guarantees.

Q: Are the supply voltage requirements the same?

A: Yes. Both parts operate across a 2V to 6V supply voltage range with identical output current and quiescent current specifications.

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