74ACTQ574SC Equivalent & Substitute Parts

Part Overview

The 74ACTQ574SC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC package. This component is classified as Obsolete, which necessitates identification of functionally equivalent substitute parts for ongoing design support and procurement continuity. The part operates at 85 MHz clock frequency with 9ns maximum propagation delay at 5V and 50pF load.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ574SC
Manufacturer	onsemi
Category	Logic
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	85 MHz
Max Propagation Delay @ 5V, 50pF	9ns
Voltage Supply Range	4.5V ~ 5.5V
Current Output High/Low	24mA / 24mA
Quiescent Current (Iq)	40 µA
Input Capacitance	4.5 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ574SC is determined by the following critical parameters:

Functional Compatibility Requirements:

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 / Case: 20-SOIC (0.295", 7.50mm Width)
Voltage Supply Range: 4.5V ~ 5.5V
Current Output High/Low: 24mA / 24mA

Performance Considerations:

Clock Frequency: 85 MHz minimum
Max Propagation Delay @ 5V, 50pF: 9ns maximum
Operating Temperature: -40°C ~ 85°C minimum range

All identified substitute parts meet these core functional and electrical requirements. Variations in quiescent current, input capacitance, and product status are noted but do not preclude substitution when functional parameters align.

Parameter Comparison

Parameter	74ACTQ574SC	MC74ACT574DWR2G	CD74ACT574M96	MC74ACT574DWG	SN74ACT574DWR	SN74ACT574NSR
Manufacturer	onsemi	onsemi	Texas Instruments	onsemi	Texas Instruments	Texas Instruments
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	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
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	85 MHz	100 MHz	110 MHz	100 MHz	110 MHz	110 MHz
Max Propagation Delay @ 5V, 50pF	9ns	11ns	11.2ns	11ns	11ns	11ns
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current Output High/Low	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA
Quiescent Current (Iq)	40 µA	8 µA	8 µA	8 µA	4 µA	4 µA
Input Capacitance	4.5 pF	4.5 pF	10 pF	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Active Status):

MC74ACT574DWR2G and MC74ACT574DWG are active onsemi products offering direct functional equivalence with improved quiescent current performance (8 µA vs. 40 µA). Both maintain identical output drive capability and voltage supply specifications. MC74ACT574DWR2G is supplied in Tape & Reel packaging, while MC74ACT574DWG is supplied in Tube packaging.

SN74ACT574DWR and SN74ACT574NSR are active Texas Instruments products with superior quiescent current characteristics (4 µA). SN74ACT574DWR is supplied in Cut Tape & Digi-Reel packaging. SN74ACT574NSR features a narrower package width (0.209" vs. 0.295") and is supplied in Tape & Reel packaging; PCB layout verification is required for this variant.

Secondary Substitute (Obsolete Status):

CD74ACT574M96 is an active Texas Instruments product with extended operating temperature range (-55°C ~ 125°C) and higher input capacitance (10 pF). This part is suitable for applications requiring broader temperature performance.

Compliance Considerations:

All active substitute parts are ROHS3 compliant and REACH unaffected. The original 74ACTQ574SC and CD74ACT574M are obsolete; active alternatives are recommended for new designs and ongoing procurement.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT574NSR be used as a direct replacement for 74ACTQ574SC?

A: SN74ACT574NSR is functionally equivalent but features a different package width (0.209" vs. 0.295"). Electrical performance is identical. PCB layout compatibility must be verified before substitution.

Q: What is the difference between MC74ACT574DWR2G and MC74ACT574DWG?

A: Both parts are electrically identical. The primary difference is packaging: MC74ACT574DWR2G is supplied in Tape & Reel format, while MC74ACT574DWG is supplied in Tube format. Selection depends on assembly process requirements.

Q: Why do substitute parts show lower quiescent current than the original 74ACTQ574SC?

A: Quiescent current variation reflects manufacturing process improvements across product generations. Lower quiescent current in substitute parts (4-8 µA vs. 40 µA) represents improved power efficiency without affecting functional performance or output drive capability.

Q: Is CD74ACT574M96 suitable for applications requiring extended temperature range?

A: CD74ACT574M96 operates from -55°C to 125°C, exceeding the original part's -40°C to 85°C range. This part is appropriate for applications requiring broader temperature performance. Input capacitance is 10 pF versus 4.5 pF in other variants.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Tape & Reel (TR), Cut Tape & Digi-Reel (CT), and Tube packaging formats. All maintain the 20-SOIC package footprint except SN74ACT574NSR, which uses a narrower 20-SO variant. Selection depends on assembly equipment compatibility and procurement volume requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts (MC74ACT574DWR2G, MC74ACT574DWG, SN74ACT574DWR, SN74ACT574NSR, and CD74ACT574M96) are ROHS3 compliant. The original 74ACTQ574SC does not specify RoHS status.

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