SN74AC574DWR Equivalent & Substitute Parts

Part Overview

The SN74AC574DWR is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit capacity and positive edge triggering. This component operates across a 2V to 6V supply range with tri-state, non-inverted outputs and is housed in a 20-SOIC surface mount package. The device is currently in active production status and maintains full RoHS3 compliance with MSL Level 1 rating.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit functional equivalents that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74AC574DWR
Manufacturer	Texas Instruments
Category	Logic
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AC574DWR is determined by strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

Package type: 20-SOIC (0.295", 7.50mm Width)
Mounting type: Surface Mount
Supply voltage range: 2V ~ 6V
Operating temperature range: -40°C ~ 85°C
Function: D-Type flip-flop with 1 element, 8-bit capacity
Trigger type: Positive Edge
Output configuration: Tri-State, Non-Inverted
Current output capability: 24mA (High and Low)
Input capacitance: 4.5 pF
RoHS3 compliance status

The identified substitute parts MC74AC374DWR2G and MC74AC377DWR2G meet these core requirements within acceptable electrical performance tolerances for the 74AC logic family series.

Parameter Comparison

Parameter	SN74AC574DWR	MC74AC374DWR2G	MC74AC377DWR2G
Manufacturer	Texas Instruments	onsemi	onsemi
Base Product Number	74AC574	74AC374	74AC377
Package / Case	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
Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1
Number of Bits per Element	8	8	8
Trigger Type	Positive Edge	Positive Edge	Positive Edge
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Non-Inverted
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Iq)	4 µA	8 µA	8 µA
Input Capacitance	4.5 pF	4.5 pF	4.5 pF
Clock Frequency	153 MHz	155 MHz	140 MHz
Max Propagation Delay @ 5V, 50pF	6ns	9.5ns	10ns
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both substitute parts maintain active product status and full RoHS3 compliance, meeting regulatory requirements equivalent to the primary part. The MC74AC374DWR2G and MC74AC377DWR2G are functionally compatible within the 74AC logic family specification envelope.

Selection between substitutes should account for the following documented differences:

MC74AC374DWR2G: Offers marginally higher clock frequency (155 MHz versus 153 MHz) with slightly increased propagation delay (9.5ns versus 6ns). Quiescent current is doubled to 8 µA. MSL rating is Level 3 (168 Hours).

MC74AC377DWR2G: Operates at 140 MHz clock frequency with 10ns maximum propagation delay. Output configuration is non-inverted without tri-state capability. Quiescent current is 8 µA. MSL rating is Level 3 (168 Hours).

All parts are supplied in 20-SOIC surface mount packaging with identical mechanical footprints and are suitable for direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can MC74AC374DWR2G and MC74AC377DWR2G be used interchangeably with SN74AC574DWR?

A: Both parts share identical package geometry, supply voltage range, operating temperature range, and output current specifications. However, MC74AC377DWR2G lacks tri-state output capability, which may restrict its use in bus-oriented applications. MC74AC374DWR2G maintains tri-state functionality and is more directly compatible.

Q: What is the significance of the MSL rating difference?

A: The primary part carries MSL Level 1 (Unlimited), while both substitutes are rated MSL Level 3 (168 Hours). This indicates the substitute parts have moisture sensitivity constraints during storage and handling. Proper moisture control during assembly is required for MSL Level 3 components.

Q: Are there differences in propagation delay that affect circuit timing?

A: Yes. The SN74AC574DWR specifies 6ns maximum propagation delay at 5V with 50pF load, while MC74AC374DWR2G specifies 9.5ns and MC74AC377DWR2G specifies 10ns. Applications with tight timing margins must account for these differences in system-level timing analysis.

Q: Do all parts meet the same regulatory compliance standards?

A: All three parts are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory requirements. ECCN and HTSUS classifications are identical across all parts.

Q: What is the practical difference in quiescent current consumption?

A: The primary part draws 4 µA quiescent current, while both substitutes draw 8 µA. For battery-powered or low-power applications with extended idle periods, this doubling of standby current may be significant in power budget calculations.

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