74ACTQ374QSCX Equivalent & Substitute Parts

Part Overview

The 74ACTQ374QSCX is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering and tri-state non-inverted output. This component operates at a clock frequency of 85 MHz with a maximum propagation delay of 9ns at 5V with 50pF load. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

74ACTQ374QSCX

onsemiIn Stock: 82474ACTQ374QSCX Datasheet

Current PartRFQ

74AHCT374D,118

Nexperia USA Inc.In Stock: 301074AHCT374D,118 Datasheet

SimilarRFQ

CY74FCT374TQCT

Texas InstrumentsIn Stock: 1004CY74FCT374TQCT Datasheet

SimilarRFQ

SN74ACT374DBR

Texas InstrumentsIn Stock: 2186SN74ACT374DBR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ374QSCX are selected based on the following critical parameters that determine functional compatibility:

Core Functional Requirements:

• D-Type flip-flop architecture with 1 element and 8-bit configuration
• Tri-state, non-inverted output topology
• Positive edge trigger mechanism
• Supply voltage range: 4.5V ~ 5.5V
• Surface mount packaging

Performance Criteria:

• Clock frequency capability equal to or exceeding 85 MHz
• Maximum propagation delay at 5V with 50pF load equal to or less than 9ns
• Operating temperature range minimum of -40°C to 85°C

Package Compatibility:

• 20-pin package configurations (LSSOP, SOIC, SSOP variants)
• Surface mount technology

The three substitute parts listed below meet these core requirements while offering active product status and improved availability compared to the obsolete 74ACTQ374QSCX.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT374DBR (Texas Instruments) is the primary substitute for the 74ACTQ374QSCX. This part maintains identical output current specifications (24mA, 24mA) and input capacitance (4.5 pF), with superior clock frequency performance (160 MHz versus 85 MHz) and faster propagation delay (8.5ns versus 9ns). The part carries active product status, ROHS3 compliance, and unlimited moisture sensitivity rating. Package variation from 20-LSSOP to 20-SSOP (0.209", 5.30mm Width) requires PCB layout verification.

CY74FCT374TQCT (Texas Instruments) provides an alternative with package geometry matching the original 20-SSOP (0.154", 3.90mm Width). This part maintains functional compatibility with propagation delay of 10ns and higher output current capability (32mA/64mA). The narrower supply voltage range (4.75V ~ 5.25V) and elevated quiescent current (200 µA) require circuit validation. Moisture sensitivity level MSL 2 (1 Year) necessitates controlled storage conditions.

74AHCT374D,118 (Nexperia USA Inc.) offers the widest operating temperature range (-40°C ~ 125°C) and lowest quiescent current (4 µA), supporting extended temperature applications. The 20-SOIC package (0.295", 7.50mm Width) represents the largest footprint variant. ROHS3 compliance and unlimited moisture sensitivity rating are provided. Propagation delay of 10.4ns and reduced output current (8mA, 8mA) require load analysis.

All three substitutes maintain active product status, REACH compliance, and EAR99 classification. Selection depends on specific circuit requirements for package geometry, thermal performance, and power consumption characteristics.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT374DBR directly replace the 74ACTQ374QSCX without circuit modifications?

A: Functional substitution is supported. The SN74ACT374DBR maintains identical logic function, output type, and electrical specifications for supply voltage and output current. However, the package changes from 20-LSSOP (0.154", 3.90mm Width) to 20-SSOP (0.209", 5.30mm Width), requiring PCB footprint and layout verification before implementation.

Q: What are the key differences between the three substitute options?

A: The SN74ACT374DBR provides the closest electrical match with identical output current and input capacitance. The CY74FCT374TQCT maintains the original narrow package width but operates within a narrower supply voltage range and requires controlled moisture storage. The 74AHCT374D,118 supports the widest temperature range and lowest power consumption but uses the largest package footprint.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SN74ACT374DBR, CY74FCT374TQCT, and 74AHCT374D,118 all carry ROHS3 compliance certification. The original 74ACTQ374QSCX RoHS status is not specified in available documentation.

Q: What is the impact of package size differences on PCB design?

A: The 74ACTQ374QSCX uses 20-LSSOP (0.154", 3.90mm Width). The SN74ACT374DBR increases to 20-SSOP (0.209", 5.30mm Width), the CY74FCT374TQCT matches at 20-SSOP (0.154", 3.90mm Width), and the 74AHCT374D,118 expands to 20-SOIC (0.295", 7.50mm Width). Pin pitch and body dimensions require footprint redesign for larger packages.

Q: Which substitute is recommended for high-temperature applications?

A: The 74AHCT374D,118 supports operating temperatures to 125°C, compared to 85°C for the original part and other substitutes. This extended range suits applications requiring elevated thermal performance.

Q: Does the CY74FCT374TQCT moisture sensitivity level affect usability?

A: The CY74FCT374TQCT carries MSL 2 (1 Year) rating, requiring controlled storage and handling within one year of packaging. The SN74ACT374DBR and 74AHCT374D,118 both carry MSL 1 (Unlimited), eliminating moisture sensitivity constraints.

Q: Are propagation delay differences significant for timing-critical circuits?

A: The SN74ACT374DBR provides the fastest propagation delay at 8.5ns, compared to 9ns for the original part. The CY74FCT374TQCT and 74AHCT374D,118 both measure 10ns and 10.4ns respectively. For circuits with tight timing margins, the SN74ACT374DBR offers the best performance headroom.