SN74AC574DW Equivalent & Substitute Parts

Part Overview

The SN74AC574DW 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, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 74AC logic family provides standard D-Type flip-flop functionality with tri-state, non-inverted outputs suitable for digital logic applications requiring edge-triggered storage and output control.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN74AC574DW
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	153 MHz
Max Propagation Delay @ 5V, 50pF	6 ns
Trigger Type	Positive Edge
Voltage Supply Range	2V ~ 6V
Current Output High/Low	24 mA / 24 mA
Quiescent Current (Iq)	4 µA
Package	20-SOIC (0.295", 7.50mm Width)
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74AC574DW is determined by the following critical parameters: D-Type flip-flop architecture, 8-bit configuration, positive edge triggering, tri-state non-inverted output capability, 20-SOIC package compatibility, and supply voltage range of 2V to 6V. All substitute parts maintain these core functional and mechanical specifications.

The substitute parts are grouped into two categories:

Direct Functional Equivalents (Same Base Product Number 74AC574): Parts that maintain identical base product designation and tri-state output configuration, including SN74AC574DWR (Texas Instruments, active status) and MC74AC574DWR2G and MC74AC574DWG (onsemi, active status).

Manufacturer-Recommended Alternatives (Different Base Product Numbers): Parts that share the 74AC logic family, D-Type flip-flop architecture, 8-bit configuration, and 20-SOIC package but use different base product designations: MC74AC374DWG, MC74AC374DWR2G (74AC374 series), and MC74AC377DWR2G (74AC377 series). These parts are recommended by manufacturers as functional alternatives within the 74AC logic family.

Parameter Comparison

Parameter	SN74AC574DW	SN74AC574DWR	MC74AC574DWR2G	MC74AC574DWG	MC74AC374DWG	MC74AC374DWR2G	MC74AC377DWR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi	onsemi	onsemi	onsemi
Series	74AC	74AC	74AC	74AC	74AC	74AC	74AC
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Bits per Element	8	8	8	8	8	8	8
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	153 MHz	153 MHz	95 MHz	95 MHz	155 MHz	155 MHz	140 MHz
Max Propagation Delay @ 5V, 50pF	6 ns	6 ns	9.5 ns	9.5 ns	9.5 ns	9.5 ns	10 ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Voltage Supply Range	2V ~ 6V	2V ~ 6V	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)	4 µA	4 µA	8 µA	8 µA	8 µA	8 µA	8 µA
Input Capacitance	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF	4.5 pF
Package	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)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

SN74AC574DWR is the primary direct equivalent, manufactured by Texas Instruments with active product status. This part maintains identical electrical specifications to the original SN74AC574DW, including 153 MHz clock frequency, 6 ns propagation delay, and 4 µA quiescent current. The only difference is packaging format (Cut Tape & Digi-Reel versus tube). This part is suitable for applications requiring the original performance characteristics.

MC74AC574DWR2G and MC74AC574DWG are onsemi equivalents of the 74AC574 base product number, maintaining tri-state non-inverted output configuration and 20-SOIC package compatibility. These parts have slightly reduced clock frequency (95 MHz) and increased propagation delay (9.5 ns) compared to the original, with higher quiescent current (8 µA). Moisture sensitivity level is MSL 3 (168 hours) versus MSL 1 for the original. These parts are suitable for applications where the performance reduction is acceptable.

MC74AC374DWG and MC74AC374DWR2G are onsemi 74AC374 series alternatives with tri-state non-inverted outputs. These parts offer 155 MHz clock frequency and 9.5 ns propagation delay, providing intermediate performance between the original and MC74AC574 onsemi variants. MSL rating is 3 (168 hours).

MC74AC377DWR2G is an onsemi 74AC377 series alternative with non-inverted output (without tri-state capability). This part has 140 MHz clock frequency and 10 ns propagation delay. Selection of this part requires confirmation that tri-state output control is not required in the application circuit.

All substitute parts maintain ROHS3 compliance, 2V to 6V supply voltage range, 24 mA output current capability, and -40°C to 85°C operating temperature range. Selection should prioritize active product status and compliance with application-specific performance requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74AC574DWR directly replace SN74AC574DW?

A: Yes. SN74AC574DWR is a direct functional equivalent manufactured by Texas Instruments with identical electrical specifications. The only difference is packaging format (Cut Tape & Digi-Reel versus tube). Both parts are 20-SOIC surface mount packages with the same pin configuration.

Q: What are the performance differences between onsemi MC74AC574 variants and the original Texas Instruments part?

A: MC74AC574DWR2G and MC74AC574DWG have reduced clock frequency (95 MHz versus 153 MHz), increased propagation delay (9.5 ns versus 6 ns), and higher quiescent current (8 µA versus 4 µA). These differences are acceptable for applications not requiring maximum speed performance.

Q: Are MC74AC374 and MC74AC377 parts suitable substitutes?

A: MC74AC374DWG and MC74AC374DWR2G are suitable for applications where 155 MHz clock frequency and 9.5 ns propagation delay are acceptable. MC74AC377DWR2G is suitable only if tri-state output control is not required in the circuit, as this part has non-inverted output without tri-state capability.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: The original SN74AC574DW has MSL 1 (unlimited shelf life). onsemi substitutes have MSL 3 (168 hours maximum shelf life after moisture exposure). This affects storage and handling procedures but does not impact electrical performance after installation.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and suitable for applications requiring RoHS compliance.

Q: Can these parts be used interchangeably in existing designs?

A: Direct substitutes (SN74AC574DWR, MC74AC574DWR2G, MC74AC574DWG) maintain identical pin configuration and 20-SOIC package dimensions. MC74AC374 and MC74AC377 variants also use the same package but have different base product numbers. Electrical performance differences must be evaluated against application timing requirements before substitution.

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