SN74AC574DBR Equivalent & Substitute Parts

Part Overview

The SN74AC574DBR is an active-status D-type flip-flop logic integrated circuit manufactured by Texas Instruments. This component functions as a single-element, 8-bit positive edge-triggered flip-flop with tri-state, non-inverted outputs. The device is packaged in a 20-SSOP surface mount configuration and operates across a 2V to 6V supply voltage range. Equivalent and substitute parts are necessary when the original part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from different manufacturers is preferred for supply chain optimization.

Substiute Parts

SN74AC574DBR

Texas InstrumentsIn Stock: 1035SN74AC574DBR Datasheet

Current PartRFQ

MC74AC374DTR2G

onsemiIn Stock: 3574MC74AC374DTR2G Datasheet

MFR RecommendedRFQ

MC74AC377DTG

onsemiIn Stock: 782MC74AC377DTG Datasheet

MFR RecommendedRFQ

MC74AC377DTR2G

onsemiIn Stock: 3640MC74AC377DTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC574DBR is determined by the following critical parameters: series classification (74AC logic family), functional type (D-type flip-flop), element and bit configuration (1 element, 8 bits), trigger mechanism (positive edge), output characteristics (tri-state capability), supply voltage range (2V ~ 6V), and operating temperature range (-40°C ~ 85°C). Substitute parts must maintain compatibility across these core electrical and functional specifications.

The substitute parts identified are grouped into two categories based on packaging format and output type configuration:

Category 1: MC74AC374 Series (Tri-State Output)

• MC74AC374DTR2G (onsemi, Cut Tape packaging)
• Maintains tri-state, non-inverted output configuration
• Package format: 20-TSSOP (0.173", 4.40mm Width)
• Electrical parameters within acceptable tolerance ranges

Category 2: MC74AC377 Series (Non-Inverted Output)

• MC74AC377DTG (onsemi, Tube packaging)
• MC74AC377DTR2G (onsemi, Tape & Reel packaging)
• Output type: Non-Inverted (without tri-state specification in provided data)
• Package format: 20-TSSOP (0.173", 4.40mm Width)
• Electrical parameters within acceptable tolerance ranges

All substitute parts maintain the 74AC series classification, positive edge trigger type, 8-bit configuration, and compatible supply voltage and temperature operating ranges.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active product status and ROHS3 compliance, ensuring continued manufacturer support and environmental regulatory alignment. The MC74AC374DTR2G provides the closest functional equivalence to the SN74AC574DBR, maintaining tri-state output capability with marginally higher clock frequency (155 MHz versus 153 MHz) and identical propagation delay specifications. The MC74AC377 series parts (DTG and DTR2G variants) offer functional substitution with slightly reduced clock frequency (140 MHz) and marginally increased propagation delay (10 ns versus 9.5 ns), with the primary distinction being output type classification as non-inverted without explicit tri-state designation.

Packaging differences exist between the main part (20-SSOP, 0.209" width) and all substitute parts (20-TSSOP, 0.173" width). This narrower TSSOP package format requires PCB layout and footprint modifications. Quiescent current consumption increases from 4 µA to 8 µA in all substitute parts, a factor relevant for low-power applications. All parts maintain identical supply voltage ranges, output current ratings, input capacitance, and operating temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can MC74AC374DTR2G directly replace SN74AC574DBR without circuit modifications?

A: Electrical functionality is compatible. However, the package format differs (20-TSSOP versus 20-SSOP), requiring PCB footprint redesign. Pin assignments must be verified against manufacturer datasheets before implementation.

Q: What is the significance of the output type difference between MC74AC374 (tri-state) and MC74AC377 (non-inverted)?

A: The MC74AC374 maintains tri-state output capability identical to the SN74AC574DBR, allowing output disable functionality. The MC74AC377 series specifies non-inverted output without explicit tri-state designation in the provided data. Circuit requirements for output control determine which substitute is appropriate.

Q: How does the quiescent current increase from 4 µA to 8 µA affect system design?

A: The 4 µA increase in standby current consumption is relevant for battery-powered or ultra-low-power applications. For standard industrial and commercial applications operating at normal clock frequencies, this difference is typically negligible relative to active-mode power consumption.

Q: Are packaging differences between SSOP and TSSOP critical for substitution?

A: Yes. SSOP and TSSOP packages have different physical dimensions and pin spacing. TSSOP is narrower (0.173" versus 0.209" width). PCB layout, footprint libraries, and assembly processes must be updated to accommodate the substitute package format.

Q: Do all substitute parts maintain the same propagation delay specifications?

A: MC74AC374DTR2G maintains identical propagation delay (9.5 ns). MC74AC377 series parts specify 10 ns propagation delay, a 0.5 ns increase. For timing-critical applications, this marginal difference must be evaluated against system timing margins.

Q: Are all parts suitable for the same operating temperature range?

A: Yes. All parts operate across -40°C to 85°C, maintaining identical temperature specifications for industrial and commercial applications.