74ACQ574SCX Equivalent & Substitute Parts

Part Overview

The 74ACQ574SCX is a D-Type flip-flop logic IC manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC package. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The 74ACQ574SCX operates across a 2V to 6V supply range with tri-state, non-inverted outputs and a maximum propagation delay of 8.5ns at 5V with 50pF load.

Substiute Parts

74ACQ574SCX

onsemiIn Stock: 306874ACQ574SCX Datasheet

Current PartRFQ

MC74AC574DWG

onsemiIn Stock: 2608MC74AC574DWG Datasheet

SimilarRFQ

MC74AC574DWR2G

onsemiIn Stock: 2232MC74AC574DWR2G Datasheet

SimilarRFQ

CD74AC574M96

Texas InstrumentsIn Stock: 2823CD74AC574M96 Datasheet

SimilarRFQ

SN74AC574DWR

Texas InstrumentsIn Stock: 3871SN74AC574DWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACQ574SCX is determined by the following critical parameters that must remain compatible:

• Package / Case: 20-SOIC (0.295", 7.50mm Width) — all substitutes must match this footprint
• Type: D-Type Flip Flop with 1 element, 8-bit configuration
• Output Type: Tri-State, Non-Inverted
• Trigger Type: Positive Edge
• Voltage - Supply: 2V ~ 6V operating range
• Current - Output High, Low: 24mA, 24mA
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount

The following parts meet these substitution criteria and are available as active alternatives:

• MC74AC574DWG (onsemi, Active)
• MC74AC574DWR2G (onsemi, Active)
• CD74AC574M96 (Texas Instruments, Active)
• SN74AC574DWR (Texas Instruments, Active)

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are active products with ROHS3 compliance and REACH unaffected status, making them suitable for new designs and production environments.

MC74AC574DWG and MC74AC574DWR2G are onsemi alternatives that maintain the same supply voltage range (2V ~ 6V) and operating temperature range (-40°C ~ 85°C) as the original 74ACQ574SCX. These parts feature improved quiescent current (8 µA versus 40 µA) and are available in active production. MC74AC574DWG is supplied in tube packaging, while MC74AC574DWR2G is supplied in cut tape and digi-reel format.

CD74AC574M96 from Texas Instruments offers an extended operating temperature range (-55°C ~ 125°C) and higher clock frequency (125 MHz), with MSL rating of 1 (Unlimited). The supply voltage range is slightly narrower (1.5V ~ 5.5V), which remains compatible with the original 2V ~ 6V specification.

SN74AC574DWR from Texas Instruments provides the fastest propagation delay (6ns) and lowest quiescent current (4 µA) among all substitutes, with MSL rating of 1 (Unlimited). This part maintains the original supply voltage range (2V ~ 6V) and operating temperature range (-40°C ~ 85°C).

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74ACQ574SCX with any of these substitute parts?

A: Yes, all four substitute parts are pin-compatible and functionally equivalent within the 20-SOIC package. They maintain the same D-Type flip-flop configuration with 8-bit positive edge triggering, tri-state non-inverted outputs, and identical output current ratings (24mA high and low).

Q: What is the main difference between the onsemi and Texas Instruments substitutes?

A: The onsemi alternatives (MC74AC574DWG and MC74AC574DWR2G) maintain identical supply voltage (2V ~ 6V) and operating temperature ranges (-40°C ~ 85°C) as the original part. Texas Instruments alternatives offer different performance characteristics: CD74AC574M96 provides extended temperature range (-55°C ~ 125°C) with slightly narrower supply voltage (1.5V ~ 5.5V), while SN74AC574DWR offers the fastest propagation delay (6ns) and lowest quiescent current (4 µA).

Q: Does the difference in quiescent current matter for my application?

A: Quiescent current differences (40 µA original versus 4-8 µA for substitutes) are relevant only for low-power or battery-operated applications. For standard industrial and commercial applications, this difference is negligible.

Q: Are there packaging differences I should consider?

A: MC74AC574DWG is supplied in tube packaging, while MC74AC574DWR2G, CD74AC574M96, and SN74AC574DWR are supplied in cut tape and digi-reel format. All parts use the same 20-SOIC footprint and are surface mount compatible.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions during storage and handling. MSL 3 (168 Hours) requires controlled storage conditions and limits the time the component can be exposed to ambient humidity before soldering. For applications with standard manufacturing environments, both ratings are acceptable.

Q: Which substitute should I choose for a new design?

A: Selection depends on specific application requirements. For direct replacement with minimal design changes, choose MC74AC574DWG or MC74AC574DWR2G. For extended temperature range applications, choose CD74AC574M96. For lowest power consumption and fastest performance, choose SN74AC574DWR.