74LVC574ADTR2G Equivalent & Substitute Parts

Part Overview

The 74LVC574ADTR2G is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering capability. This component is classified as obsolete, though 803 units remain in stock as new original inventory. The part operates across a supply voltage range of 1.65V to 3.6V with a maximum propagation delay of 7ns at 3.3V with 50pF load. Due to its obsolete status, identifying functionally equivalent and substitute parts is necessary for design continuity and long-term component availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVC574ADTR2G
Manufacturer	onsemi
Series	74LVC
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	200 MHz
Max Propagation Delay @ 3.3V, 50pF	7ns
Trigger Type	Positive Edge
Voltage - Supply	1.65V ~ 3.6V
Current - Output High, Low	24mA, 24mA
Current - Quiescent (Iq)	10 µA
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74LVC574ADTR2G are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

D-Type flip-flop architecture with 1 element and 8-bit configuration
Tri-state, non-inverted output type
Positive edge trigger mechanism
20-TSSOP package form factor (0.173", 4.40mm Width)
Surface mount mounting type
Quiescent current of 10 µA
Output drive capability of 24mA (high and low)
ROHS3 compliance and MSL 1 rating

Secondary Compatibility Parameters:

Clock frequency: 150 MHz minimum (original part: 200 MHz)
Propagation delay: 8.5ns maximum at 3.3V (original part: 7ns)
Supply voltage range: Minimum 1.65V to 2V; Maximum 3.6V
Input capacitance: 4pF to 7pF range
Operating temperature: -40°C minimum; 85°C to 125°C maximum

Parts meeting all primary criteria and falling within secondary parameter tolerances are classified as direct substitutes. Parts with identical electrical specifications across all parameters are classified as parametric equivalents.

Parameter Comparison

Parameter	74LVC574ADTR2G (Main)	MC74LCX574DTR2G	SN74LVC574APWR	SN74LVC574APWT	SN74LVC574AQPWREP	74LVC574APW,118	74LVC574APW/AUJ
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	NXP Semiconductors	NXP USA Inc.
Series	74LVC	74LCX	74LVC	74LVC	74LVC	74LVC	74LVC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Clock Frequency	200 MHz	150 MHz	150 MHz	150 MHz	150 MHz	200 MHz	200 MHz
Max Propagation Delay @ 3.3V	7ns @ 50pF	8.5ns @ 50pF	6.8ns @ 50pF	6.8ns @ 50pF	7ns @ 30pF	7ns @ 50pF	7ns @ 50pF
Voltage - Supply	1.65V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Current - Quiescent (Iq)	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA
Input Capacitance	5 pF	7 pF	4 pF	4 pF	4 pF	5 pF	5 pF
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	803 Pcs	85400 Pcs	237968 Pcs	1209 Pcs	895 Pcs	195695 Pcs	932 Pcs

Engineering Selection Recommendations

For Active Product Designs:

SN74LVC574APWR (Texas Instruments) and 74LVC574APW,118 (NXP Semiconductors) are the primary recommended substitutes. Both parts maintain active product status, full ROHS3 compliance, and identical electrical specifications to the original 74LVC574ADTR2G across all critical parameters including 200 MHz clock frequency, 7ns propagation delay at 3.3V with 50pF load, and 1.65V to 3.6V supply voltage range. SN74LVC574APWR offers the highest inventory availability at 237,968 units. 74LVC574APW/AUJ (NXP USA Inc.) provides an alternative with equivalent specifications and active status.

For Extended Temperature Range Applications:

Designs requiring the full -40°C to 125°C operating temperature range should avoid MC74LCX574DTR2G, which operates only to 85°C maximum. All other substitute options maintain the full temperature range of the original part.

For Minimum Supply Voltage Compatibility:

MC74LCX574DTR2G and SN74LVC574AQPWREP specify a minimum supply voltage of 2V, compared to 1.65V for the original part. Applications requiring operation below 2V must use SN74LVC574APWR, SN74LVC574APWT, 74LVC574APW,118, or 74LVC574APW/AUJ.

For Load Capacitance Considerations:

SN74LVC574AQPWREP specifies propagation delay at 30pF load rather than 50pF. For applications with higher load capacitance, verify timing margins against the 7ns specification at 50pF provided by other substitute options.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX574DTR2G be used as a direct replacement for 74LVC574ADTR2G?

A: MC74LCX574DTR2G meets the primary substitution criteria for package, pin configuration, and core electrical function. However, it operates only to 85°C maximum temperature compared to 125°C for the original part, and specifies a minimum supply voltage of 2V versus 1.65V. Verify your application's temperature and voltage requirements before selection.

Q: What is the difference between the Texas Instruments and NXP substitute options?

A: SN74LVC574APWR (Texas Instruments) and 74LVC574APW,118 (NXP Semiconductors) both provide parametric equivalence to the original part with identical electrical specifications. The primary differences are manufacturer, packaging format (Cut Tape & Digi-Reel versus Bulk), and inventory availability. SN74LVC574APWR offers significantly higher stock levels.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts except 74LVC574APW,118 explicitly specify ROHS3 compliance. Verify compliance documentation with your supplier for 74LVC574APW,118 if ROHS3 certification is required for your application.

Q: Does the 20-TSSOP package remain consistent across all substitutes?

A: Yes. All substitute parts use the identical 20-TSSOP (0.173", 4.40mm Width) package form factor, ensuring mechanical and electrical pin compatibility without PCB redesign.

Q: What is the significance of the different propagation delay specifications?

A: Propagation delay determines the maximum speed at which the flip-flop can reliably capture and transfer data. The original part specifies 7ns at 3.3V with 50pF load. SN74LVC574APWR and SN74LVC574APWT achieve 6.8ns under identical conditions, providing improved timing margin. MC74LCX574DTR2G specifies 8.5ns, which remains within acceptable range for most applications but should be verified against your timing budget.

Q: Can I mix different substitute parts within the same design?

A: All substitute parts maintain identical output drive capability (24mA), quiescent current (10 µA), and MSL 1 rating. Mixing parts is permissible from an electrical standpoint, though maintaining single-source parts per design is recommended for supply chain consistency and manufacturing traceability.

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