SN74ACT574DW Equivalent & Substitute Parts

Part Overview

The SN74ACT574DW 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 at a maximum clock frequency of 110 MHz with 11ns propagation delay at 5V and 50pF load. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74ACT574DW
Manufacturer	Texas Instruments
Series	74ACT
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency (Max)	110 MHz
Max Propagation Delay @ 5V, 50pF	11ns
Trigger Type	Positive Edge
Current - Output High/Low	24mA / 24mA
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Iq)	4 µA
Input Capacitance	4.5 pF
Operating Temperature	-40°C ~ 85°C (TA)
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 SN74ACT574DW is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Type: D-Type flip-flop architecture
Number of Elements: 1
Number of Bits per Element: 8
Output Type: Tri-State configuration (eliminates MC74ACT377 variants)
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Trigger Type: Positive Edge

Allowable Parameter Variations:

Clock Frequency: Substitute parts may exceed the original 110 MHz specification
Max Propagation Delay: Substitute parts may be equal to or faster than 11ns
Current - Quiescent (Iq): Substitute parts may vary (4 µA to 8 µA acceptable)
Moisture Sensitivity Level (MSL): May differ (MSL 1 or MSL 3 acceptable)
Packaging Format: Cut Tape, Tape & Reel, or Tube acceptable for same 20-SOIC package

Non-Substitutable Variants: MC74ACT374 series (different base product number, different functional architecture) and MC74ACT377 series (non-inverted output without tri-state capability) do not qualify as direct substitutes despite similar packaging.

Parameter Comparison

Parameter	SN74ACT574DW	SN74ACT574DWR	MC74ACT574DWR2G	MC74ACT574DWG
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi
Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1
Number of Bits per Element	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Clock Frequency (Max)	110 MHz	110 MHz	100 MHz	100 MHz
Max Propagation Delay @ 5V, 50pF	11ns	11ns	11ns	11ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Current - Output High/Low	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	4 µA	4 µA	8 µA	8 µA
Input Capacitance	4.5 pF	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)
Product Status	Discontinued	Active	Active	Active
Packaging Format	Tube	Cut Tape & Digi-Reel	Tape & Reel (TR)	Tube

Engineering Selection Recommendations

Primary Substitute: SN74ACT574DWR

The SN74ACT574DWR from Texas Instruments is the direct active equivalent of the discontinued SN74ACT574DW. This part maintains identical electrical specifications including 110 MHz clock frequency, 11ns propagation delay, and 4 µA quiescent current. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect functional performance. Product status is Active, ensuring long-term availability. RoHS3 compliance and MSL 1 rating match the original specification.

Secondary Substitutes: MC74ACT574DWR2G and MC74ACT574DWG

Both onsemi variants (MC74ACT574DWR2G in Tape & Reel format and MC74ACT574DWG in Tube format) are functionally compatible alternatives. These parts maintain the same 8-bit D-Type tri-state architecture, output drive capability (24mA), and supply voltage range. Clock frequency specification is 100 MHz (lower than the original 110 MHz), and propagation delay remains 11ns. Quiescent current is 8 µA (higher than the original 4 µA). Both parts carry Active product status and ROHS3 compliance. MSL rating is 3 (168 Hours), requiring appropriate moisture control during storage and handling compared to the original MSL 1 rating.

Non-Substitutable Parts:

MC74ACT374 series and MC74ACT377 series variants are not suitable replacements. The MC74ACT374 uses a different base product number and functional architecture. The MC74ACT377 series lacks tri-state output capability, providing only non-inverted output without output enable control, making it functionally incompatible with designs requiring tri-state logic.

Frequently Asked Questions (FAQ)

Q: Can I use MC74ACT574DWR2G or MC74ACT574DWG as direct replacements for SN74ACT574DW?

A: Yes. Both onsemi parts are functionally equivalent. They maintain the same 8-bit D-Type tri-state flip-flop architecture, 20-SOIC package, and electrical performance within acceptable parameters. The onsemi variants have slightly higher quiescent current (8 µA versus 4 µA) and lower maximum clock frequency specification (100 MHz versus 110 MHz), but both remain within typical operating margins for 74ACT logic applications. MSL 3 rating requires standard moisture control practices during storage.

Q: Why are MC74ACT374 and MC74ACT377 not suitable substitutes?

A: MC74ACT374 is a different device with a different base product number and internal architecture, despite similar packaging. MC74ACT377 lacks tri-state output capability—it provides only non-inverted output without output enable control. Designs requiring tri-state bus interface capability cannot use MC74ACT377 without circuit modification.

Q: What is the difference between Cut Tape, Tape & Reel, and Tube packaging formats?

A: These are packaging and delivery formats that do not affect electrical performance. Cut Tape & Digi-Reel format is suitable for automated pick-and-place assembly. Tape & Reel (TR) format is standard for high-volume production. Tube format is typical for lower-volume or manual assembly applications. All three formats contain the same 20-SOIC component.

Q: Does the higher quiescent current (8 µA) of onsemi variants affect circuit performance?

A: The increase from 4 µA to 8 µA quiescent current is negligible in most applications. This affects only standby power consumption. For designs with strict power budget requirements, the Texas Instruments SN74ACT574DWR with 4 µA specification is preferred.

Q: What does MSL 3 (168 Hours) mean compared to MSL 1 (Unlimited)?

A: MSL 3 indicates the component requires reflow soldering within 168 hours of package opening under controlled humidity conditions. MSL 1 (Unlimited) has no time restriction. For standard manufacturing environments with proper moisture control, MSL 3 components present no practical limitation. Extended storage or high-humidity environments may require baking before reflow.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN74ACT574DWR, MC74ACT574DWR2G, and MC74ACT574DWG are all ROHS3 compliant, matching the original SN74ACT574DW specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message