SN74LVC574APWRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC574APWRG4 is a D-type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit parallel data storage capability. This device operates as a positive-edge-triggered flip-flop with tri-state, non-inverted outputs in a 20-TSSOP surface-mount package. The part is currently discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute components that maintain functional and electrical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC574APWRG4
Manufacturer	Texas Instruments
Base Product Number	74LVC574
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 50pF	6.8 ns
Trigger Type	Positive Edge
Current - Output High/Low	24 mA / 24 mA
Voltage - Supply	1.65V ~ 3.6V
Current - Quiescent (Iq)	10 µA
Input Capacitance	4 pF
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm 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 SN74LVC574APWRG4 is determined by strict equivalence across the following critical parameters:

Functional Equivalence Requirements:

D-Type flip-flop architecture with 1 element, 8-bit configuration
Tri-state, non-inverted output topology
Positive edge trigger mechanism
20-TSSOP package form factor

Electrical Compatibility Parameters:

Supply voltage range: 1.65V ~ 3.6V (minimum overlap required)
Clock frequency: 150 MHz or higher
Propagation delay: 6.8 ns or faster at 3.3V, 50pF load
Output current capability: 24 mA minimum (both high and low)
Operating temperature range: -40°C minimum to 125°C maximum (or subset thereof)
Quiescent current: 10 µA or lower
Input capacitance: 4 pF or lower

Compliance Requirements:

ROHS3 compliance mandatory
MSL rating of 1 (Unlimited) preferred for manufacturing flexibility

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications and active product status) and manufacturer-recommended alternatives (functionally compatible with minor parameter variations acceptable for specific applications).

Parameter Comparison

Part Number	Manufacturer	Series	Clock Freq (MHz)	Prop Delay @ 3.3V, 50pF (ns)	Supply Voltage (V)	Iq (µA)	Input Cap (pF)	Temp Range (°C)	Packaging	Product Status
SN74LVC574APWRG4	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	10	4	-40 ~ 125	Tape & Reel (TR)	Discontinued
SN74LVC574APWR	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	10	4	-40 ~ 125	Cut Tape (CT) & Digi-Reel®	Active
SN74LVC574APWT	Texas Instruments	74LVC	150	6.8	1.65 ~ 3.6	10	4	-40 ~ 125	Tape & Reel (TR)	Active
74LCX574FT	Toshiba Semiconductor and Storage	74LCX	150	8.5	1.65 ~ 3.6	10	7	-40 ~ 85	Tape & Reel (TR)	Active
74LVC574APW,118	NXP Semiconductors	74LVC	200	7	1.65 ~ 3.6	10	5	-40 ~ 125	Bulk	Active
MC74LCX374DTR2G	onsemi	74LCX	150	8.5	2 ~ 3.6	10	7	-40 ~ 85	Cut Tape (CT)	Active
MC74LCX574DTG	onsemi	74LCX	150	8.5	2 ~ 3.6	10	7	-40 ~ 85	Tube	Obsolete
MC74LCX574DTR2G	onsemi	74LCX	150	8.5	2 ~ 3.6	10	7	-40 ~ 85	Tape & Reel (TR)	Active
74LVC374APW,118	Nexperia USA Inc.	74LVC	150	7	1.65 ~ 3.6	10	4	-40 ~ 125	Tape & Reel (TR)	Active

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents):

SN74LVC574APWR and SN74LVC574APWT are direct parametric equivalents manufactured by Texas Instruments. Both maintain identical electrical specifications to the SN74LVC574APWRG4, including 6.8 ns propagation delay, 150 MHz clock frequency, and -40°C to 125°C operating temperature range. Both are ROHS3 compliant with MSL rating of 1. The primary difference is packaging format: SN74LVC574APWR is supplied in Cut Tape and Digi-Reel format, while SN74LVC574APWT is supplied in Tape & Reel format. Both maintain active product status with substantial inventory availability.

Secondary Substitutes (Manufacturer-Recommended Alternatives):

74LVC574APW,118 (NXP Semiconductors) provides enhanced performance with 200 MHz clock frequency and 7 ns propagation delay while maintaining full supply voltage compatibility (1.65V ~ 3.6V) and -40°C to 125°C operating range. This part is ROHS3 compliant and carries active product status. The slightly increased propagation delay (7 ns vs. 6.8 ns) and input capacitance (5 pF vs. 4 pF) remain within acceptable substitution parameters for most applications.

74LCX574FT (Toshiba Semiconductor and Storage) and MC74LCX574DTR2G (onsemi) represent cross-manufacturer alternatives from the 74LCX logic family. These parts maintain 150 MHz clock frequency and 8.5 ns propagation delay. Critical parameter differences include reduced operating temperature range (-40°C to 85°C vs. 125°C maximum) and minimum supply voltage of 2V (vs. 1.65V). These parts are suitable for applications not requiring the extended upper temperature specification or lower voltage operation of the original part. Both are ROHS3 compliant and carry active product status.

Not Recommended:

MC74LCX574DTG (onsemi) carries obsolete product status and should not be selected for new designs despite functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC574APWR be used as a direct replacement for SN74LVC574APWRG4?

A: Yes. SN74LVC574APWR is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel). Both are manufactured by Texas Instruments, ROHS3 compliant, and carry active product status. Verify your procurement and assembly process accommodates the Cut Tape format.

Q: What is the functional difference between 74LVC574 and 74LCX574 series parts?

A: Both are D-type flip-flops with 8-bit configuration and tri-state outputs. The 74LCX series (Toshiba, onsemi) exhibits slightly higher propagation delay (8.5 ns vs. 6.8 ns) and reduced operating temperature range (85°C maximum vs. 125°C). The 74LVC series maintains superior speed performance and extended temperature capability. Select 74LCX variants only when the reduced temperature range and slightly slower propagation delay are acceptable for your application.

Q: Is the 74LVC374APW,118 (Nexperia) compatible with the original SN74LVC574APWRG4?

A: The 74LVC374APW,118 is functionally compatible as a D-type flip-flop with 8-bit configuration and tri-state outputs. However, this part is from the 74LVC374 base product number, not 74LVC574. Verify your circuit design does not depend on specific pinout or functional differences between 574 and 374 variants before substitution. Electrical parameters are compatible (1.65V ~ 3.6V supply, -40°C to 125°C operation, ROHS3 compliant).

Q: Why does the NXP 74LVC574APW,118 show 200 MHz clock frequency while the original shows 150 MHz?

A: The NXP part offers enhanced performance specifications with higher maximum clock frequency (200 MHz vs. 150 MHz) and faster propagation delay (7 ns vs. 6.8 ns). This represents a performance upgrade suitable for applications requiring higher speed operation. The part remains backward compatible with designs specified for 150 MHz operation.

Q: What packaging considerations apply when substituting SN74LVC574APWT for SN74LVC574APWRG4?

A: Both parts use identical 20-TSSOP (0.173", 4.40mm Width) surface-mount package. The difference is supply format: the original uses Tape & Reel (TR) format, and SN74LVC574APWT also uses Tape & Reel format. No PCB layout or assembly process changes are required. Verify tape specifications with your assembly partner if using automated pick-and-place equipment.

Q: Can I use MC74LCX574DTR2G in a design requiring -40°C to 125°C operation?

A: No. MC74LCX574DTR2G is rated for -40°C to 85°C operating temperature. If your application requires operation above 85°C, this part is not suitable. Select SN74LVC574APWR, SN74LVC574APWT, or 74LVC574APW,118 instead, all of which support -40°C to 125°C operation.

Q: Are all recommended substitutes ROHS3 compliant?

A: Yes. All active substitute parts listed (SN74LVC574APWR, SN74LVC574APWT, 74LCX574FT, 74LVC574APW,118, MC74LCX374DTR2G, and MC74LCX574DTR2G) are ROHS3 compliant. All carry MSL rating of 1 (Unlimited) except where not specified in source data.

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