SN74AC574PW Equivalent & Substitute Parts

Part Overview

The SN74AC574PW is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit positive edge triggering in a 20-TSSOP surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74AC series logic family provides standard D-Type flip-flop functionality with tri-state, non-inverted outputs suitable for digital signal storage and bus interface applications.

Substiute Parts

SN74AC574PW

Texas InstrumentsIn Stock: 898SN74AC574PW Datasheet

Current PartRFQ

SN74AC574PWR

Texas InstrumentsIn Stock: 3868SN74AC574PWR Datasheet

DirectRFQ

MC74AC374DTR2G

onsemiIn Stock: 3574MC74AC374DTR2G Datasheet

MFR RecommendedRFQ

MC74AC377DTG

onsemiIn Stock: 782MC74AC377DTG Datasheet

MFR RecommendedRFQ

MC74AC377DTR2G

onsemiIn Stock: 3640MC74AC377DTR2G Datasheet

MFR RecommendedRFQ

MC74AC574DTR2G

onsemiIn Stock: 17818MC74AC574DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74AC574PW is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• D-Type flip-flop architecture with 1 element, 8-bit configuration
• Positive edge trigger mechanism
• 20-TSSOP surface mount package (0.173", 4.40mm Width)
• Tri-state, non-inverted output configuration
• Voltage supply range: 2V to 6V
• Operating temperature: -40°C to 85°C
• RoHS3 compliance and MSL 1 rating

Substitute Categories:

Direct Equivalents (Same Base Product Number 74AC574):

• SN74AC574PWR (Texas Instruments) – Active product status, identical electrical specifications, alternative packaging (Cut Tape & Digi-Reel)
• MC74AC574DTR2G (onsemi) – Active product status, identical electrical specifications, Tape & Reel packaging

Functional Alternatives (Different Base Product Number, Compatible Parameters):

• MC74AC374DTR2G (onsemi) – D-Type flip-flop with identical bit configuration and package, tri-state output, minor variations in clock frequency (155 MHz vs 153 MHz) and quiescent current (8 µA vs 4 µA)
• MC74AC377DTG (onsemi) – D-Type flip-flop with identical bit configuration and package, non-inverted output (without tri-state), minor variations in clock frequency (140 MHz) and propagation delay (10 ns)
• MC74AC377DTR2G (onsemi) – D-Type flip-flop with identical bit configuration and package, non-inverted output (without tri-state), Tape & Reel packaging, minor variations in clock frequency (140 MHz) and propagation delay (10 ns)

Parameter Comparison

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Recommended): SN74AC574PWR and MC74AC574DTR2G are direct functional equivalents with identical electrical specifications to the SN74AC574PW. Both parts maintain the 74AC574 base product number, tri-state output configuration, and all critical timing parameters. SN74AC574PWR remains available from Texas Instruments with active product status. MC74AC574DTR2G is supplied by onsemi in Tape & Reel packaging with the highest inventory availability (17,800 pcs). Both parts carry ROHS3 compliance and MSL 1 rating, ensuring compatibility with current manufacturing and environmental standards.

Tier 2 – Functional Alternatives (Conditional Use): MC74AC374DTR2G and MC74AC377DTG/MC74AC377DTR2G provide functional D-Type flip-flop operation with 8-bit configuration in the same 20-TSSOP package. These alternatives differ in output configuration and minor timing specifications. MC74AC374DTR2G maintains tri-state output but operates at 155 MHz clock frequency with 8 µA quiescent current. MC74AC377 variants provide non-inverted output without tri-state capability, with 140 MHz clock frequency and 10 ns propagation delay. These alternatives are suitable only when tri-state output is not required or when the timing variations are acceptable for the application. All alternatives maintain ROHS3 compliance and MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can SN74AC574PWR be used as a direct replacement for SN74AC574PW? A: Yes. SN74AC574PWR is a direct equivalent with identical electrical specifications, package type (20-TSSOP), and functional characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel vs Tube) and active product status. No circuit modifications are required.

Q: What is the difference between MC74AC574DTR2G and MC74AC374DTR2G? A: Both are 8-bit D-Type flip-flops in 20-TSSOP packages with tri-state outputs. MC74AC574DTR2G operates at 153 MHz with 4 µA quiescent current (matching the original SN74AC574PW). MC74AC374DTR2G operates at 155 MHz with 8 µA quiescent current. The 74AC574 variant is the closer electrical match.

Q: Why are MC74AC377 parts listed as alternatives if they lack tri-state output? A: MC74AC377DTG and MC74AC377DTR2G provide D-Type flip-flop functionality with 8-bit configuration in the same 20-TSSOP package. These parts are functional alternatives only when tri-state output capability is not required by the circuit design. If tri-state output is essential, these parts are not suitable substitutes.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: What packaging options are available for 74AC574 equivalents? A: SN74AC574PWR is supplied in Cut Tape & Digi-Reel packaging. MC74AC574DTR2G is supplied in Tape & Reel (TR) packaging. Both maintain the 20-TSSOP package type suitable for surface mount assembly.

Q: Can I use MC74AC377DTR2G if my circuit requires tri-state output? A: No. MC74AC377DTR2G provides non-inverted output without tri-state capability. If tri-state output is required, use SN74AC574PWR, MC74AC574DTR2G, or MC74AC374DTR2G instead.

Q: What is the inventory status of available substitutes? A: SN74AC574PWR has 3,848 pcs available. MC74AC574DTR2G has the highest availability at 17,800 pcs. MC74AC374DTR2G has 3,480 pcs. MC74AC377DTG has 710 pcs. MC74AC377DTR2G has 3,600 pcs available.