74ACT574SJ Equivalent & Substitute Parts

Part Overview

The 74ACT574SJ is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and positive edge triggering. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates at 110 MHz clock frequency with tri-state, non-inverted outputs suitable for digital logic applications requiring edge-triggered data storage and bus interface capabilities.

Substiute Parts

74ACT574SJ

onsemiIn Stock: 225974ACT574SJ Datasheet

Current PartRFQ

SN74ACT574NSR

Texas InstrumentsIn Stock: 4218SN74ACT574NSR Datasheet

DirectRFQ

CD74ACT574M

Texas InstrumentsIn Stock: 3513CD74ACT574M Datasheet

SimilarRFQ

CD74ACT574M96

Texas InstrumentsIn Stock: 50372CD74ACT574M96 Datasheet

SimilarRFQ

SN74ACT574DW

Texas InstrumentsIn Stock: 2264SN74ACT574DW Datasheet

SimilarRFQ

SN74ACT574DWR

Texas InstrumentsIn Stock: 18738SN74ACT574DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT574SJ are identified based on the following critical parameters that determine functional and mechanical compatibility:

Core Functional Parameters:

• Series: 74ACT (Advanced CMOS Technology logic family)
• Type: D-Type Flip Flop with 1 element, 8-bit configuration
• Output Type: Tri-State, Non-Inverted
• Trigger Type: Positive Edge
• Clock Frequency: 110 MHz minimum
• Voltage Supply Range: 4.5V ~ 5.5V
• Output Drive Capability: 24 mA minimum (High and Low)

Mechanical Parameters:

• Mounting Type: Surface Mount
• Package Family: 20-SOIC (0.209" or 0.295" width variants acceptable)

Acceptable Variations:

• Propagation delay up to 11.2 ns at 5V, 50pF load
• Quiescent current between 4 µA and 40 µA
• Input capacitance between 4.5 pF and 10 pF
• Operating temperature range: -40°C ~ 85°C or -55°C ~ 125°C
• Product status: Active or Obsolete (both acceptable for substitution purposes)
• Packaging format: Tape & Reel, Cut Tape, or Tube

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - Direct Replacement: SN74ACT574NSR (Texas Instruments) is the optimal direct substitute for the 74ACT574SJ. This part maintains identical electrical specifications including propagation delay (11 ns), output drive capability (24 mA), and operating temperature range (-40°C ~ 85°C). The package footprint is mechanically compatible (20-SOIC, 0.209" width). SN74ACT574NSR holds Active product status and carries ROHS3 compliance certification, ensuring long-term availability and regulatory alignment.

Secondary Substitutes - Compatible with Package Consideration: SN74ACT574DWR (Texas Instruments) provides equivalent electrical performance with Active product status and ROHS3 compliance. The package footprint differs slightly (20-SOIC, 0.295" width), requiring PCB layout verification for mechanical fit. This part is currently in active production with substantial inventory availability.

CD74ACT574M96 (Texas Instruments) offers extended operating temperature range (-55°C ~ 125°C) and Active product status with ROHS3 compliance. The 20-SOIC package width is 0.295", necessitating mechanical compatibility assessment. This part maintains all critical electrical parameters within acceptable tolerance.

Tertiary Substitutes - Limited Availability: CD74ACT574M (Texas Instruments) is classified as Obsolete but remains functionally equivalent. The extended temperature range (-55°C ~ 125°C) may provide design margin for demanding applications. Package width is 0.295" (20-SOIC).

SN74ACT574DW (Texas Instruments) is discontinued at DiGi Electronics but maintains electrical equivalence. This part should be considered only when other options are unavailable.

Compliance and Regulatory Status: All Texas Instruments substitutes carry ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications. REACH compliance and ECCN classification (EAR99) are consistent across all parts.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT574NSR be used as a direct drop-in replacement for 74ACT574SJ? A: Yes. SN74ACT574NSR is electrically and mechanically equivalent. Both parts use the 20-SOIC package with 0.209" width, identical pin configuration, and matching electrical specifications. No circuit modifications are required.

Q: What is the difference between the 0.209" and 0.295" package width variants? A: Both are 20-SOIC packages with identical pin pitch and electrical characteristics. The width difference affects PCB footprint dimensions. Parts with 0.295" width (CD74ACT574M, CD74ACT574M96, SN74ACT574DW, SN74ACT574DWR) require verification that existing PCB layouts accommodate the larger body width. Pin-to-pin spacing remains constant.

Q: Why does CD74ACT574M96 have lower quiescent current (8 µA) compared to the original 74ACT574SJ (40 µA)? A: Lower quiescent current indicates improved power efficiency in the substitute part. This represents a design enhancement and does not affect functional compatibility. The substitute will consume less standby power while maintaining all specified performance parameters.

Q: Is the extended temperature range of CD74ACT574M (-55°C ~ 125°C) compatible with designs specified for -40°C ~ 85°C? A: Yes. Extended temperature range is a superset of the original specification. Parts rated for -55°C ~ 125°C will operate correctly within the narrower -40°C ~ 85°C range. This provides additional design margin for thermal stress conditions.

Q: What is the significance of Active versus Obsolete product status? A: Active status indicates ongoing production and long-term availability. Obsolete status indicates discontinued manufacturing. For new designs, Active parts (SN74ACT574NSR, CD74ACT574M96, SN74ACT574DWR) are preferred. Obsolete parts may be used for legacy system maintenance if inventory is available.

Q: Are all substitute parts ROHS3 compliant? A: All Texas Instruments substitutes carry ROHS3 compliance certification. The original 74ACT574SJ does not specify RoHS status. ROHS3 compliance ensures the parts meet current environmental and regulatory requirements for electronic component manufacturing.

Q: Can packaging format (Tape & Reel, Cut Tape, Tube) affect electrical performance? A: No. Packaging format affects only handling, storage, and procurement logistics. Electrical and functional specifications remain identical regardless of packaging format. Selection should be based on assembly process requirements and inventory management practices.

Q: What inventory levels are available for each substitute? A: SN74ACT574NSR: 4,200 pcs; CD74ACT574M96: 50,300 pcs; SN74ACT574DWR: 18,709 pcs; CD74ACT574M: 3,464 pcs; SN74ACT574DW: 2,200 pcs. CD74ACT574M96 offers the highest availability for volume production requirements.