CD74AC574MG4 Equivalent & Substitute Parts

Part Overview

The CD74AC574MG4 is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74AC574MG4
Manufacturer	Texas Instruments
Series	74AC
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	125 MHz
Max Propagation Delay @ 5V, 50pF	10.8 ns
Trigger Type	Positive Edge
Voltage Supply Range	1.5V ~ 5.5V
Current Output High/Low	24 mA / 24 mA
Quiescent Current (Iq)	8 µA
Input Capacitance	10 pF
Operating Temperature Range	-55°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the CD74AC574MG4 is determined by the following critical parameters:

Functional Equivalence Criteria:

D-Type flip-flop architecture with 1 element, 8-bit configuration
Positive edge trigger mechanism
Tri-State, Non-Inverted output type
20-SOIC surface mount package

Electrical Compatibility Criteria:

Supply voltage range must encompass or match the original specification (1.5V ~ 5.5V)
Output drive capability (24 mA minimum for both high and low states)
Propagation delay performance within acceptable operating margins
Quiescent current specification (8 µA)

Compliance & Availability Criteria:

Active product status preferred for long-term supply assurance
RoHS3 compliance for regulatory alignment
Moisture sensitivity level compatibility for assembly processes

Substitute parts are grouped into two categories: direct functional equivalents with identical electrical specifications, and parametric equivalents with minor variations in clock frequency or operating temperature range that remain functionally compatible within the 74AC logic family.

Parameter Comparison

Parameter	CD74AC574MG4 (Main)	CD74AC574M96	MC74AC574DWR2G	MC74AC574DWG	MC74AC374DWR2G	MC74AC374DWG	MC74AC377DWR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi	onsemi	onsemi	onsemi
Product Status	Discontinued	Active	Active	Active	Active	Active	Active
Type	D-Type (74AC574)	D-Type (74AC574)	D-Type (74AC574)	D-Type (74AC574)	D-Type (74AC374)	D-Type (74AC374)	D-Type (74AC377)
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Non-Inverted
Clock Frequency	125 MHz	125 MHz	95 MHz	95 MHz	155 MHz	155 MHz	140 MHz
Max Propagation Delay @ 5V, 50pF	10.8 ns	10.8 ns	9.5 ns	9.5 ns	9.5 ns	9.5 ns	10 ns
Voltage Supply Range	1.5V ~ 5.5V	1.5V ~ 5.5V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current Output High/Low	24 mA / 24 mA	24 mA / 24 mA	24 mA / 24 mA	24 mA / 24 mA	24 mA / 24 mA	24 mA / 24 mA	24 mA / 24 mA
Quiescent Current (Iq)	8 µA	8 µA	8 µA	8 µA	8 µA	8 µA	8 µA
Input Capacitance	10 pF	10 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Packaging Format	Not specified	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Tube	Tape & Reel	Tube	Tape & Reel
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Inventory Status	978 Pcs	2735 Pcs	2200 Pcs	2584 Pcs	3699 Pcs	878 Pcs	1655 Pcs

Engineering Selection Recommendations

Primary Substitute: CD74AC574M96

CD74AC574M96 is the direct functional equivalent from Texas Instruments with identical electrical specifications, clock frequency, propagation delay, and operating temperature range. This part maintains the original 1.5V ~ 5.5V supply voltage range and 10 pF input capacitance. Product status is Active, ensuring long-term availability. RoHS3 compliance and MSL 1 rating match the original specification. This is the preferred substitute for applications requiring no design modifications.

Secondary Substitutes: MC74AC574DWR2G and MC74AC574DWG

Both onsemi MC74AC574 variants provide functional equivalence with identical D-Type 8-bit architecture and tri-state non-inverted output. These parts feature improved propagation delay (9.5 ns versus 10.8 ns) and lower input capacitance (4.5 pF versus 10 pF). Supply voltage range extends to 6V maximum. Operating temperature range is narrower (-40°C ~ 85°C). Both parts are Active status with RoHS3 compliance. MSL 3 rating requires controlled moisture handling during assembly. MC74AC574DWR2G is packaged in Cut Tape & Digi-Reel format; MC74AC574DWG is supplied in Tube format.

Parametric Equivalents: MC74AC374DWR2G, MC74AC374DWG, and MC74AC377DWR2G

These onsemi parts represent the 74AC374 and 74AC377 logic families within the 74AC series. MC74AC374 variants feature higher clock frequency (155 MHz) and improved propagation delay (9.5 ns). MC74AC377DWR2G provides 140 MHz clock frequency with 10 ns propagation delay and non-inverted output without tri-state capability. All three parts are Active status with RoHS3 compliance and MSL 3 rating. Operating temperature range is -40°C ~ 85°C. These parts are functionally compatible within the 74AC logic family but require circuit-level verification for output configuration compatibility.

Obsolete Reference: CD74AC374M

CD74AC374M from Harris Corporation is listed as Obsolete and RoHS non-compliant. This part is not recommended for new designs or production substitution.

Frequently Asked Questions (FAQ)

Q: Can CD74AC574M96 be used as a direct replacement for CD74AC574MG4?

A: Yes. CD74AC574M96 is a direct functional equivalent with identical electrical specifications, including clock frequency (125 MHz), propagation delay (10.8 ns @ 5V, 50pF), supply voltage range (1.5V ~ 5.5V), and operating temperature range (-55°C ~ 125°C). Both parts feature tri-state non-inverted output in 20-SOIC packaging. The primary difference is product status: CD74AC574M96 is Active, ensuring supply availability.

Q: What are the key differences between MC74AC574 and MC74AC374 variants?

A: Both are D-Type flip-flops in the 74AC family with 8-bit configuration and 20-SOIC packaging. The primary functional difference is the base product number: 74AC574 versus 74AC374. MC74AC374 variants feature higher clock frequency (155 MHz versus 95-125 MHz) and improved propagation delay (9.5 ns versus 10.8 ns). Both maintain 24 mA output drive capability and 8 µA quiescent current. Circuit-level verification is required to confirm functional compatibility in the specific application.

Q: Are onsemi MC74AC574 parts compatible with the original Texas Instruments CD74AC574MG4?

A: MC74AC574DWR2G and MC74AC574DWG are functionally compatible with identical D-Type 8-bit architecture, tri-state non-inverted output, and 20-SOIC packaging. Electrical differences include narrower operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C), extended supply voltage maximum (6V versus 5.5V), and lower input capacitance (4.5 pF versus 10 pF). These differences are within acceptable substitution parameters for most applications. MSL 3 rating requires controlled moisture handling during assembly and storage.

Q: What is the significance of MSL rating differences between parts?

A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions; parts can be stored indefinitely without desiccant protection. MSL 3 (168 Hours) requires that parts be stored in controlled humidity environments and used within 168 hours of package opening. CD74AC574M96 maintains MSL 1 rating. onsemi MC74AC574 and MC74AC374 variants are MSL 3, requiring adherence to moisture control procedures during manufacturing and assembly to prevent solder joint reliability issues.

Q: Can MC74AC377DWR2G substitute for CD74AC574MG4?

A: MC74AC377DWR2G is a parametric equivalent within the 74AC logic family but differs in output configuration: it provides non-inverted output without tri-state capability, whereas CD74AC574MG4 provides tri-state non-inverted output. This functional difference requires circuit-level verification. If tri-state output is essential to the application, MC74AC377DWR2G is not suitable. If tri-state is not required, MC74AC377DWR2G offers 140 MHz clock frequency and 10 ns propagation delay with Active product status and RoHS3 compliance.

Q: What packaging format differences exist among substitute parts?

A: CD74AC574M96 is available in Cut Tape & Digi-Reel format. MC74AC574DWR2G is supplied in Cut Tape & Digi-Reel; MC74AC574DWG is supplied in Tube. MC74AC374DWR2G and MC74AC377DWR2G are supplied in Tape & Reel format. MC74AC374DWG is supplied in Tube. Packaging format selection depends on manufacturing process requirements and volume. Cut Tape & Digi-Reel and Tape & Reel formats are suitable for automated pick-and-place assembly; Tube format is suitable for manual or semi-automated assembly.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. CD74AC574M96, MC74AC574DWR2G, MC74AC574DWG, MC74AC374DWR2G, MC74AC374DWG, and MC74AC377DWR2G are all RoHS3 compliant. CD74AC374M (Harris Corporation, Obsolete) is RoHS non-compliant and is not recommended for new designs.

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