CD74AC574M Equivalent & Substitute Parts

Part Overview

The CD74AC574M is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit capacity and tri-state, non-inverted output configuration. This component operates as a standard positive edge-triggered flip-flop in the 74AC logic family, housed in a 20-SOIC surface mount package. The CD74AC574M is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity.

Substiute Parts

CD74AC574M

Texas InstrumentsIn Stock: 50399CD74AC574M Datasheet

Current PartRFQ

CD74AC574M96

Texas InstrumentsIn Stock: 2823CD74AC574M96 Datasheet

DirectRFQ

CD74AC374M

Harris CorporationIn Stock: 2098CD74AC374M Datasheet

Parametric EquivalentRFQ

MC74AC574DWR2G

onsemiIn Stock: 2232MC74AC574DWR2G Datasheet

DirectRFQ

MC74AC374DWG

onsemiIn Stock: 984MC74AC374DWG Datasheet

MFR RecommendedRFQ

MC74AC374DWR2G

onsemiIn Stock: 3778MC74AC374DWR2G Datasheet

MFR RecommendedRFQ

MC74AC377DWR2G

onsemiIn Stock: 1739MC74AC377DWR2G Datasheet

MFR RecommendedRFQ

MC74AC574DWG

onsemiIn Stock: 2608MC74AC574DWG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74AC574M is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Type: D-Type Flip-Flop
• Number of Elements: 1
• Number of Bits per Element: 8
• Trigger Type: Positive Edge
• Output Type: Tri-State, Non-Inverted
• Current - Output High/Low: 24 mA / 24 mA

Allowable Parameter Variations:

• Clock Frequency: Substitute parts may exceed the original 125 MHz specification
• Max Propagation Delay: Substitute parts may be equal to or faster than 10.8 ns
• Voltage Supply Range: Substitute parts may have narrower ranges (2V ~ 6V is acceptable)
• Operating Temperature: Substitute parts may have narrower ranges (-40°C ~ 85°C is acceptable)
• Input Capacitance: Substitute parts may differ (4.5 pF is acceptable)
• Quiescent Current: Must remain at 8 µA
• RoHS Status: ROHS3 Compliant required

Substitute parts are grouped into two categories: direct manufacturer equivalents (identical base product number 74AC574) and parametric equivalents with different base product numbers but matching functional and electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CD74AC574M96

CD74AC574M96 is the direct equivalent from Texas Instruments with identical electrical specifications and the same base product number 74AC574. This part maintains the original 125 MHz clock frequency, 10.8 ns propagation delay, and extended operating temperature range (-55°C ~ 125°C). The primary advantage is product status: CD74AC574M96 is currently active, ensuring long-term availability. MSL rating of 1 (Unlimited) matches the original part, reducing moisture handling requirements during assembly. This is the preferred substitute for applications requiring exact performance matching and extended temperature operation.

Secondary Substitutes: MC74AC574DWR2G and MC74AC574DWG (onsemi)

Both onsemi 74AC574 variants maintain the tri-state, non-inverted output configuration and identical output current specifications. These parts feature faster propagation delay (9.5 ns) compared to the original 10.8 ns, providing performance margin. However, operating temperature range is narrower (-40°C ~ 85°C), and MSL rating is 3 (168 Hours), requiring controlled moisture handling. These substitutes are suitable for commercial and industrial temperature applications where extended temperature operation is not required.

Parametric Equivalents: MC74AC374DWG, MC74AC374DWR2G, and MC74AC377DWR2G (onsemi)

These parts share the same 20-SOIC package, surface mount configuration, and core D-type flip-flop architecture. MC74AC374 variants feature higher clock frequency (155 MHz) and faster propagation delay (9.5 ns). MC74AC377DWR2G differs in output type (non-inverted without tri-state specification) and operates at 140 MHz with 10 ns propagation delay. All onsemi parts have narrower operating temperature ranges and MSL rating of 3. These are suitable only when the specific output configuration and temperature range are compatible with application requirements.

Obsolete Part: CD74AC374M (Harris Corporation)

CD74AC374M is marked as obsolete and is not recommended for new designs or production continuity planning.

Frequently Asked Questions (FAQ)

Q: Can I use CD74AC574M96 as a direct replacement for CD74AC574M?

A: Yes. CD74AC574M96 is a direct equivalent from the same manufacturer (Texas Instruments) with identical electrical specifications, package, and base product number. It is currently active and recommended as the primary substitute.

Q: What is the difference between the onsemi MC74AC574 variants and the Texas Instruments CD74AC574M?

A: Both maintain the same 74AC574 base product number and tri-state, non-inverted output configuration. The onsemi parts feature faster propagation delay (9.5 ns vs. 10.8 ns) but have a narrower operating temperature range (-40°C ~ 85°C vs. -55°C ~ 125°C) and higher moisture sensitivity level (MSL 3 vs. MSL 1). They are suitable for commercial and industrial applications but not for extended temperature environments.

Q: What does MSL rating mean, and why does it matter?

A: Moisture Sensitivity Level (MSL) indicates how sensitive a component is to moisture absorption during storage and handling. MSL 1 (Unlimited) means the part has no moisture-related restrictions. MSL 3 (168 Hours) means the part must be used within 168 hours of opening the moisture barrier bag. CD74AC574M96 has MSL 1, while onsemi substitutes have MSL 3, requiring more careful handling during assembly.

Q: Can I use MC74AC374DWG or MC74AC377DWR2G instead of CD74AC574M?

A: These are parametric equivalents, not direct substitutes. MC74AC374 has a different base product number (74AC374 vs. 74AC574), and MC74AC377 has a different base product number (74AC377). While they share the same package and core D-type flip-flop architecture, functional differences may exist. Use only if your application requirements are compatible with their specific output configurations and operating parameters.

Q: What packaging options are available for the substitute parts?

A: CD74AC574M96 is available in Cut Tape (CT) & Digi-Reel® packaging. MC74AC574DWR2G is available in Cut Tape (CT) & Digi-Reel®. MC74AC574DWG is available in Tube. MC74AC374DWG is available in Tube. MC74AC374DWR2G and MC74AC377DWR2G are available in Tape & Reel (TR). Select packaging based on your production volume and assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts (CD74AC574M96, MC74AC574DWR2G, MC74AC574DWG, MC74AC374DWG, MC74AC374DWR2G, and MC74AC377DWR2G) are ROHS3 compliant, matching the original CD74AC574M specification.

Q: What is the difference between tri-state and non-inverted output types?

A: Tri-state output means the output can be in one of three states: high, low, or high-impedance (disabled). Non-inverted means the output logic matches the input logic (1 in = 1 out). MC74AC377DWR2G is specified as non-inverted without tri-state, meaning it lacks the high-impedance output state. This functional difference makes it unsuitable as a direct substitute for applications requiring tri-state output control.