74ACT374MSA Equivalent & Substitute Parts

Part Overview

The 74ACT374MSA is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-SSOP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement.

The 74ACT374 series operates at 160 MHz clock frequency with tri-state, non-inverted outputs, making it suitable for digital logic applications requiring edge-triggered data storage. Due to its obsolete status, direct replacements from active manufacturers are required for new designs and production continuity.

Substiute Parts

74ACT374MSA

onsemiIn Stock: 105074ACT374MSA Datasheet

Current PartRFQ

SN74ACT374DBR

Texas InstrumentsIn Stock: 2186SN74ACT374DBR Datasheet

DirectRFQ

SN74ACT574DBR

Texas InstrumentsIn Stock: 2034SN74ACT574DBR Datasheet

DirectRFQ

SN74ACT374PW

Texas InstrumentsIn Stock: 3334SN74ACT374PW Datasheet

SimilarRFQ

SN74ACT374PWR

Texas InstrumentsIn Stock: 1954SN74ACT374PWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT374MSA is determined by the following critical parameters:

Functional Equivalence Requirements:

• D-Type flip-flop architecture with 1 element, 8-bit configuration
• Positive edge trigger mechanism
• Tri-state, non-inverted output configuration
• 160 MHz clock frequency capability (or higher)
• Propagation delay ≤ 10 ns @ 5V, 50pF load
• Output drive capability: 24 mA minimum (both high and low)
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C

Package Compatibility:

• Primary: 20-SSOP (0.209", 5.30mm Width) - direct pin-for-pin replacement
• Secondary: 20-TSSOP (0.173", 4.40mm Width) - functionally equivalent with package footprint change

Electrical Performance: Substitute parts must maintain or exceed the propagation delay specification and output current ratings. Quiescent current differences are acceptable provided they do not exceed design power budgets.

Parameter Comparison

Engineering Selection Recommendations

Direct Pin-for-Pin Replacement (20-SSOP Package):

SN74ACT374DBR from Texas Instruments is the primary direct substitute for 74ACT374MSA. This part maintains identical package geometry (20-SSOP, 0.209" width), meets or exceeds all electrical specifications with 8.5 ns propagation delay, and carries Active product status with ROHS3 compliance. The reduced quiescent current (4 µA vs. 40 µA) provides improved power efficiency without functional impact.

Alternative with Package Change (20-TSSOP Package):

SN74ACT374PWR and SN74ACT374PW provide functional equivalence with a narrower package footprint (20-TSSOP, 0.173" width). Both maintain 160 MHz clock frequency and 10 ns propagation delay. SN74ACT374PWR is Active status with ROHS3 compliance, while SN74ACT374PW is discontinued at DiGi Electronics. Package transition requires PCB layout modification.

Limited Compatibility Option:

SN74ACT574DBR is functionally compatible but operates at reduced clock frequency (110 MHz vs. 160 MHz) with slightly higher propagation delay (11 ns vs. 10 ns). This part is suitable only for applications where the lower performance specifications are acceptable. It maintains the 20-SSOP package format and Active product status with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT374DBR directly replace 74ACT374MSA without PCB modification?

A: Yes. SN74ACT374DBR is a direct pin-for-pin replacement. Both parts use the 20-SSOP package with identical pinout, electrical specifications, and operating parameters. No PCB layout changes are required.

Q: What is the difference between SN74ACT374DBR and SN74ACT574DBR?

A: Both are 8-bit D-Type flip-flops in 20-SSOP packages with tri-state outputs. The primary difference is clock frequency: SN74ACT374DBR operates at 160 MHz with 8.5 ns propagation delay, while SN74ACT574DBR operates at 110 MHz with 11 ns propagation delay. Select SN74ACT374DBR for timing-critical applications requiring full 160 MHz performance.

Q: Why do SN74ACT374PW and SN74ACT374PWR use a different package?

A: Both parts use the 20-TSSOP package (0.173" width) instead of 20-SSOP (0.209" width). This narrower package reduces PCB footprint but requires different land pattern design. Electrical functionality remains identical to the SSOP versions.

Q: Is the quiescent current difference between 74ACT374MSA (40 µA) and SN74ACT374DBR (4 µA) significant?

A: The 36 µA difference is negligible in most applications. The lower quiescent current in SN74ACT374DBR provides improved power efficiency. This difference becomes relevant only in ultra-low-power designs where standby current is a critical design parameter.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitutes (SN74ACT374DBR, SN74ACT574DBR, SN74ACT374PW, SN74ACT374PWR) are ROHS3 compliant. The original onsemi 74ACT374MSA RoHS status is not specified in the provided data.

Q: Which substitute part should I select for new designs?

A: SN74ACT374DBR is the recommended choice for new designs. It provides direct pin-for-pin compatibility, Active product status ensuring long-term availability, ROHS3 compliance, and superior propagation delay performance (8.5 ns). This part offers the lowest technical and supply-chain risk.