CD74ACT574M Equivalent & Substitute Parts

Part Overview

The CD74ACT574M is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, configured as a single element with 8-bit positive edge triggering in a 20-SOIC surface mount package. This component functions as a standard octal D-type flip-flop with tri-state, non-inverted outputs, operating at a clock frequency of 110 MHz with a maximum propagation delay of 11.2 ns at 5V with 50 pF load.

The CD74ACT574M is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Type	D-Type Flip-Flop	—
Number of Elements	1	—
Number of Bits per Element	8	—
Output Type	Tri-State, Non-Inverted	—
Trigger Type	Positive Edge	—
Clock Frequency	110	MHz
Max Propagation Delay @ 5V, 50pF	11.2	ns
Output Current (High/Low)	24 / 24	mA
Supply Voltage Range	4.5 – 5.5	V
Quiescent Current	8	µA
Input Capacitance	10	pF
Operating Temperature Range	−55 to +125	°C
Package Type	20-SOIC (0.295", 7.50mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CD74ACT574M is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Type: D-Type flip-flop
Number of Elements: 1
Number of Bits per Element: 8
Output Type: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Package: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: 4.5 – 5.5 V
Output Current: 24 mA (High and Low)
Quiescent Current: 8 µA

Acceptable Variations:

Clock Frequency: Equal to or greater than 110 MHz
Max Propagation Delay: Equal to or less than 11.2 ns @ 5V, 50pF
Input Capacitance: Any value (not a limiting factor)
Operating Temperature Range: May be narrower than −55 to +125°C
Packaging Format: Tube or Tape & Reel (both surface mount formats)
RoHS Compliance: ROHS3 Compliant preferred; non-compliant parts noted
Moisture Sensitivity Level: May vary (1, 3, or higher acceptable)

Substitute parts are grouped into three categories: MFR Recommended (manufacturer-endorsed direct replacements), Parametric Equivalent (functionally identical with different base part numbers), and Direct Manufacturer alternatives (active production from alternate suppliers).

Parameter Comparison

Part Number	Manufacturer	Status	Clock Freq (MHz)	Max Prop Delay (ns)	Input Cap (pF)	Temp Range (°C)	Package	RoHS	MSL
CD74ACT574M	Texas Instruments	Obsolete	110	11.2	10	−55 to +125	20-SOIC (Tube)	ROHS3	1
CD74ACT574M96	Texas Instruments	Active	110	11.2	10	−55 to +125	20-SOIC (TR)	ROHS3	1
CD74ACT374M	Harris Corporation	Obsolete	110	11.2	10	−55 to +125	20-SOIC (Tube)	Non-Compliant	—
MC74ACT574DWR2G	onsemi	Active	100	11	4.5	−40 to +85	20-SOIC (TR)	ROHS3	3
MC74ACT574DWG	onsemi	Active	100	11	4.5	−40 to +85	20-SOIC (Tube)	ROHS3	3
MC74ACT374DWR2G	onsemi	Active	160	10	4.5	−40 to +85	20-SOIC (TR)	ROHS3	3
MC74ACT374DWG	onsemi	Active	160	10	4.5	−40 to +85	20-SOIC (Tube)	ROHS3	3
MC74ACT377DWR2G	onsemi	Active	140	10	4.5	−40 to +85	20-SOIC (TR)	ROHS3	3
MC74ACT377DWG	onsemi	Obsolete	140	10	4.5	−40 to +85	20-SOIC (Tube)	ROHS3	3

Engineering Selection Recommendations

Primary Recommendation: CD74ACT574M96

CD74ACT574M96 is the manufacturer-recommended direct substitute. This part is manufactured by Texas Instruments, the original equipment manufacturer of the CD74ACT574M. It maintains identical electrical specifications (110 MHz clock frequency, 11.2 ns propagation delay, 10 pF input capacitance) and the same extended operating temperature range (−55 to +125°C). The primary difference is packaging format: CD74ACT574M96 is supplied in Tape & Reel format rather than Tube, which is standard for active production. Both parts are ROHS3 Compliant with MSL 1 (Unlimited). This part is preferred for applications requiring the extended temperature range and is the most direct replacement.

Secondary Recommendation: MC74ACT574DWR2G or MC74ACT574DWG

onsemi manufactures the MC74ACT574 series as an active alternative. Both MC74ACT574DWR2G (Tape & Reel) and MC74ACT574DWG (Tube) are functionally equivalent with identical output type (Tri-State, Non-Inverted), element configuration (1 element, 8-bit), and supply voltage range (4.5 – 5.5 V). These parts meet or exceed the propagation delay specification (11 ns vs. 11.2 ns) and are ROHS3 Compliant. The operating temperature range is narrower (−40 to +85°C vs. −55 to +125°C), which is acceptable for most commercial and industrial applications. These parts are in active production with higher inventory availability.

Alternative Consideration: MC74ACT374DWR2G or MC74ACT374DWG

The MC74ACT374 series from onsemi offers superior performance characteristics: 160 MHz clock frequency and 10 ns propagation delay. However, the base part number differs (74ACT374 vs. 74ACT574), indicating a different internal logic configuration. These parts are functionally compatible as D-Type flip-flops with tri-state outputs but should be selected only when the specific 74ACT374 pinout and logic function are acceptable for the application.

Not Recommended: CD74ACT374M

CD74ACT374M (Harris Corporation) is a parametric equivalent but is obsolete and RoHS non-compliant. This part should not be selected for new designs or ongoing production.

Not Recommended: MC74ACT377DWR2G or MC74ACT377DWG

The MC74ACT377 series has non-inverted output type without tri-state capability, making it functionally different from the CD74ACT574M. These parts are suitable only if the application specifically requires non-inverted, non-tri-state outputs.

Frequently Asked Questions (FAQ)

Q1: Can I use CD74ACT574M96 as a direct replacement for CD74ACT574M?

Yes. CD74ACT574M96 is the manufacturer-recommended substitute from Texas Instruments. Both parts have identical electrical specifications and the same 20-SOIC package. The only difference is the packaging format: CD74ACT574M is supplied in Tube, while CD74ACT574M96 is supplied in Tape & Reel. Both formats are surface mount and compatible with standard assembly equipment.

Q2: What is the difference between Tube and Tape & Reel packaging?

Tube and Tape & Reel are both surface mount packaging formats for the same 20-SOIC component. Tube packaging is used for lower-volume orders and manual assembly. Tape & Reel packaging is used for high-volume automated assembly. The electrical and mechanical specifications of the component are identical; only the delivery and handling format differs.

Q3: Can I substitute MC74ACT574DWG for CD74ACT574M?

Yes, with one consideration. MC74ACT574DWG from onsemi is functionally equivalent and meets all critical electrical parameters. However, the operating temperature range is narrower (−40 to +85°C vs. −55 to +125°C). If your application operates within the −40 to +85°C range, this part is a suitable substitute. If your application requires operation below −40°C or above +85°C, use CD74ACT574M96 instead.

Q4: Why do some substitute parts have different input capacitance values?

Input capacitance (10 pF for CD74ACT574M vs. 4.5 pF for onsemi parts) reflects manufacturing process differences between Texas Instruments and onsemi. Both values are acceptable for the 74ACT logic family. Lower input capacitance (4.5 pF) is not a limitation; it indicates improved performance characteristics. This parameter does not affect substitutability.

Q5: Can I use MC74ACT374DWR2G instead of CD74ACT574M?

MC74ACT374DWR2G is functionally compatible as a D-Type flip-flop with tri-state outputs, but the base part number differs (74ACT374 vs. 74ACT574). This indicates a different internal logic configuration. Substitution is possible only if the specific pinout and logic function of the 74ACT374 are acceptable for your application. Verify pinout compatibility before substitution.

Q6: What does ROHS3 Compliant mean?

ROHS3 Compliant indicates the part meets the Restriction of Hazardous Substances Directive 3 (RoHS 3), which restricts the use of specific hazardous materials in electrical and electronic equipment. All recommended substitutes are ROHS3 Compliant, ensuring compliance with environmental regulations.

Q7: What is Moisture Sensitivity Level (MSL)?

MSL indicates the maximum time a component can be exposed to moisture at specified temperature and humidity conditions before soldering. MSL 1 (Unlimited) means the part has no moisture sensitivity restrictions. MSL 3 (168 Hours) means the part must be soldered within 168 hours of opening the package. For most applications, both levels are acceptable; however, MSL 1 parts offer greater handling flexibility.

Q8: Which substitute part should I choose for a new design?

For new designs, select CD74ACT574M96 (Texas Instruments, active production) or MC74ACT574DWR2G (onsemi, active production). Both are in active production with stable supply chains. CD74ACT574M96 is preferred if your application requires the extended temperature range (−55 to +125°C). MC74ACT574DWR2G is preferred if your application operates within −40 to +85°C and you require higher inventory availability.

Q9: Are all substitute parts pin-compatible with CD74ACT574M?

Yes. All substitute parts listed use the 20-SOIC package with identical pinout. Pin compatibility is guaranteed for all parts in this substitution list.

Q10: What is the difference between "MFR Recommended" and "Direct Manufacturer" substitutes?

MFR Recommended substitutes are endorsed by the original equipment manufacturer (Texas Instruments) as direct replacements. Direct Manufacturer substitutes are from alternative manufacturers (onsemi) and are functionally equivalent but not officially endorsed by the original manufacturer. Both categories are suitable for substitution; the distinction reflects the source of the recommendation.

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