SN74AHCT374DBRG4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT374DBRG4 is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit parallel data storage capability. This device operates as a positive edge-triggered flip-flop with tri-state, non-inverted outputs, designed for digital logic applications requiring synchronous data latching and buffering. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility within system designs.

Substiute Parts

SN74AHCT374DBRG4

Texas InstrumentsIn Stock: 1151SN74AHCT374DBRG4 Datasheet

Current PartRFQ

SN74AHCT374DBR

Texas InstrumentsIn Stock: 3256SN74AHCT374DBR Datasheet

MFR RecommendedRFQ

74VHC374MTCX

Fairchild SemiconductorIn Stock: 335374VHC374MTCX Datasheet

MFR RecommendedRFQ

MC74VHC374DTR2G

onsemiIn Stock: 3683MC74VHC374DTR2G Datasheet

MFR RecommendedRFQ

MC74VHC574DTG

onsemiIn Stock: 1441MC74VHC574DTG Datasheet

MFR RecommendedRFQ

MC74VHC574DTR2G

onsemiIn Stock: 32810MC74VHC574DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AHCT374DBRG4 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Criteria:

• D-Type flip-flop architecture with 1 element and 8-bit configuration
• Positive edge trigger functionality
• Tri-state, non-inverted output configuration
• Operating temperature range: -40°C ~ 85°C
• Surface mount packaging with 20-pin configuration
• Supply voltage compatibility within specified ranges
• Propagation delay performance within acceptable system timing margins
• Output drive capability: 8mA minimum for both high and low states

Substitute Parts Identified:

1. SN74AHCT374DBR (Texas Instruments) – Direct series equivalent with identical electrical specifications and 20-SSOP package. Active product status with higher inventory availability.

2. 74VHC374MTCX (Fairchild Semiconductor) – Cross-series substitute with compatible D-type 8-bit architecture. Operates across extended supply voltage range (2V ~ 5.5V). 20-TSSOP package with reduced width (0.173", 4.40mm). Clock frequency 120 MHz with 10.1 ns propagation delay.

3. MC74VHC374DTR2G (onsemi) – Cross-series substitute with identical functional specification to 74VHC374MTCX. Tape & Reel packaging format. Active product status with substantial inventory.

4. MC74VHC574DTG (onsemi) – Functionally equivalent D-type 8-bit flip-flop with 115 MHz clock frequency and 10.6 ns propagation delay. Tube packaging. Compatible tri-state output configuration.

5. MC74VHC574DTR2G (onsemi) – Functionally equivalent to MC74VHC574DTG with Tape & Reel packaging. Highest inventory availability (32,700 units). Active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AHCT374DBR

The SN74AHCT374DBR is the preferred substitute for the discontinued SN74AHCT374DBRG4. This part maintains identical electrical specifications, clock frequency, propagation delay, and supply voltage requirements. Both devices operate within the 74AHCT series logic family, ensuring direct functional compatibility. The SN74AHCT374DBR is currently active with 3,155 units in stock, providing supply continuity. ROHS3 compliance and MSL 1 rating match the original specification. The 20-SSOP package is mechanically identical, requiring no PCB layout modifications.

Secondary Recommendation: MC74VHC374DTR2G or 74VHC374MTCX

Cross-series substitutes from the 74VHC logic family are functionally equivalent alternatives when supply voltage flexibility is advantageous. These parts operate across an extended supply range (2V ~ 5.5V) compared to the 74AHCT series (4.5V ~ 5.5V). Clock frequency is reduced to 120 MHz with 10.1 ns propagation delay, remaining within acceptable timing margins for most applications. The 20-TSSOP package is mechanically compatible with standard 20-pin SSOP footprints, though the reduced width (0.173" vs 0.209") may require PCB layout verification. MC74VHC374DTR2G offers the highest inventory availability (3,600 units) in Tape & Reel format. ROHS3 compliance is maintained.

Tertiary Recommendation: MC74VHC574DTR2G

The MC74VHC574DTR2G provides functional equivalence with the highest inventory availability (32,700 units). This part operates at 115 MHz with 10.6 ns propagation delay. Extended supply voltage range (2V ~ 5.5V) and ROHS3 compliance are maintained. Tape & Reel packaging supports automated assembly processes. The 20-TSSOP package requires the same PCB layout considerations as other 74VHC alternatives.

Package Consideration:

Designs currently using 20-SSOP footprints can accommodate 20-TSSOP packages without electrical impact, as both are 20-pin surface mount configurations. Physical footprint differences (width: 0.209" vs 0.173") require verification against PCB layout constraints and assembly equipment capabilities.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT374DBR directly replace the SN74AHCT374DBRG4 without design changes?

A: Yes. The SN74AHCT374DBR is electrically and mechanically identical to the SN74AHCT374DBRG4. Both operate at 130 MHz with 10.4 ns propagation delay, require 4.5V ~ 5.5V supply voltage, and use the 20-SSOP package. No PCB modifications or firmware changes are required.

Q: What are the key differences between 74AHCT and 74VHC series substitutes?

A: The 74AHCT series operates exclusively within 4.5V ~ 5.5V supply range, while 74VHC series supports 2V ~ 5.5V operation. Clock frequency is reduced from 130 MHz (74AHCT374) to 120 MHz (74VHC374) or 115 MHz (74VHC574). Propagation delays increase slightly (10.1 ns to 10.6 ns). Both series maintain identical output drive capability (8mA) and tri-state functionality. 74VHC substitutes are suitable for applications requiring lower supply voltage operation.

Q: Are package differences between 20-SSOP and 20-TSSOP significant for PCB design?

A: Both packages are 20-pin surface mount configurations with identical pin pitch and electrical connectivity. The primary difference is package width: 20-SSOP measures 0.209" (5.30mm) while 20-TSSOP measures 0.173" (4.40mm). Standard PCB footprints accommodate both packages. Verify assembly equipment compatibility with the narrower 20-TSSOP profile if switching from 20-SSOP designs.

Q: Which substitute offers the best inventory availability?

A: MC74VHC574DTR2G provides the highest inventory with 32,700 units in stock. MC74VHC374DTR2G offers 3,600 units, and SN74AHCT374DBR provides 3,155 units. All three are currently active products with reliable supply status.

Q: Do all substitutes maintain RoHS3 compliance?

A: SN74AHCT374DBR, MC74VHC374DTR2G, MC74VHC574DTG, and MC74VHC574DTR2G are all ROHS3 compliant. The 74VHC374MTCX RoHS status is not specified in available documentation. Verify compliance requirements for your specific application before selection.

Q: What is the impact of reduced clock frequency in 74VHC substitutes?

A: 74VHC substitutes operate at 120 MHz (74VHC374) or 115 MHz (74VHC574) compared to 130 MHz for the original 74AHCT374. This reduction is acceptable for most digital logic applications where clock frequencies remain well below maximum device ratings. Verify system timing requirements to confirm compatibility with the reduced maximum frequency.

Q: Can I use MC74VHC574 variants as substitutes for MC74VHC374 variants?

A: Yes. Both MC74VHC574DTG and MC74VHC574DTR2G are functionally equivalent to MC74VHC374DTR2G and 74VHC374MTCX. All maintain identical D-type 8-bit flip-flop architecture, tri-state output configuration, and electrical specifications. The primary differences are clock frequency (115 MHz vs 120 MHz) and propagation delay (10.6 ns vs 10.1 ns), both within acceptable margins for standard logic applications.