SN74LVC574APWRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC574APWRE4 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 standard positive-edge-triggered flip-flop with tri-state, non-inverted outputs in a 20-TSSOP surface mount package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC574APWRE4
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74LVC574APWRE4 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Base product number (74LVC574 or functionally equivalent 74LVC374/74LCX574)
D-Type flip-flop architecture with 8-bit configuration
Tri-state, non-inverted output type
Positive edge trigger functionality
20-TSSOP package form factor
Surface mount mounting type
Supply voltage range compatibility (minimum 1.65V ~ 3.6V)
Operating temperature range (-40°C ~ 125°C preferred)

Substitution Categories:

Category 1: Texas Instruments 74LVC574 Series (Direct Parametric Equivalents) Parts SN74LVC574APWR and SN74LVC574APWT are parametrically identical to the main part with identical electrical specifications. These differ only in packaging format (Cut Tape/Digi-Reel vs. Tape & Reel) and product status (Active vs. Obsolete).

Category 2: NXP Semiconductors 74LVC574 Series (Manufacturer-Recommended Equivalents) Parts 74LVC574APW,118 and 74LVC574APW/AUJ are manufacturer-recommended equivalents from NXP. These maintain identical functional architecture and package but feature slightly higher clock frequency (200 MHz vs. 150 MHz) and marginally different propagation delay (7 ns vs. 6.8 ns).

Category 3: onsemi 74LCX574 Series (Functional Equivalents with Parameter Variations) Parts MC74LCX574DTG and MC74LCX574DTR2G are functional equivalents from onsemi using the 74LCX logic family. These maintain 8-bit D-type flip-flop architecture and tri-state outputs but operate with a narrower supply voltage range (2V ~ 3.6V vs. 1.65V ~ 3.6V), higher propagation delay (8.5 ns vs. 6.8 ns), and reduced operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C).

Category 4: Nexperia 74LVC374 Series (Functional Equivalents with Different Base Product) Parts 74LVC374APW,118, 74LVC374APW-Q100J, and 74LVC374APW/AUJ use the 74LVC374 base product number (latch variant) rather than 74LVC574 (flip-flop variant). These maintain identical electrical specifications and package but implement a different storage architecture (latch vs. flip-flop).

Parameter Comparison

Part Number	Manufacturer	Product Status	Clock Frequency (MHz)	Max Propagation Delay @ 3.3V, 50pF (ns)	Supply Voltage Range (V)	Operating Temperature (°C)	Packaging
SN74LVC574APWRE4	Texas Instruments	Obsolete	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
SN74LVC574APWR	Texas Instruments	Active	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
SN74LVC574APWT	Texas Instruments	Active	150	6.8	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
74LVC574APW,118	NXP Semiconductors	Active	200	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
74LVC574APW/AUJ	NXP USA Inc.	Active	200	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
MC74LCX574DTR2G	onsemi	Active	150	8.5	2.0 ~ 3.6	-40 ~ 85	20-TSSOP
MC74LCX574DTG	onsemi	Obsolete	150	8.5	2.0 ~ 3.6	-40 ~ 85	20-TSSOP
74LVC374APW,118	Nexperia USA Inc.	Active	150	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
74LVC374APW-Q100J	Nexperia USA Inc.	Active	150	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP
74LVC374APW/AUJ	NXP USA Inc.	Active	150	7.0	1.65 ~ 3.6	-40 ~ 125	20-TSSOP

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred): SN74LVC574APWR and SN74LVC574APWT are the optimal substitutes. Both are Texas Instruments products with identical electrical specifications to the obsolete SN74LVC574APWRE4. SN74LVC574APWR is available in Cut Tape/Digi-Reel packaging with 237,968 units in stock, providing superior availability. SN74LVC574APWT is available in Tape & Reel format with 1,209 units in stock. Both parts are ROHS3 compliant and maintain the full operating temperature range of -40°C to 125°C.

Tier 2 - Manufacturer-Recommended Equivalents: 74LVC574APW,118 (NXP) and 74LVC574APW/AUJ (NXP USA Inc.) are manufacturer-recommended alternatives. These parts maintain full functional compatibility and identical supply voltage range. The slightly higher clock frequency (200 MHz) and marginally increased propagation delay (7 ns vs. 6.8 ns) are within acceptable tolerance for most applications. Both are ROHS3 compliant and support the full -40°C to 125°C operating temperature range. 74LVC574APW,118 offers 195,695 units in stock.

Tier 3 - Functional Equivalents with Constraints: MC74LCX574DTR2G (onsemi) is an active product with high availability (85,400 units). However, this part operates with a narrower supply voltage range (2V ~ 3.6V minimum vs. 1.65V ~ 3.6V) and reduced operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C). Use this substitute only when the application does not require operation below 2V supply or above 85°C ambient temperature.

Tier 4 - Latch Variants (Architecture Difference): 74LVC374APW,118, 74LVC374APW-Q100J, and 74LVC374APW/AUJ are 74LVC374 latch devices rather than 74LVC574 flip-flops. While electrically similar, these parts implement a different storage architecture (transparent latch vs. edge-triggered flip-flop). Use only if the application circuit is designed for latch operation or if functional equivalence has been verified.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74LVC574APWRE4 with SN74LVC574APWR? A: Yes. SN74LVC574APWR is a direct parametric equivalent with identical electrical specifications, package form factor, and operating characteristics. The only difference is product status (Active vs. Obsolete) and packaging format (Cut Tape/Digi-Reel vs. the original format). This is the recommended replacement.

Q: What is the difference between 74LVC574 and 74LVC374? A: The 74LVC574 is an edge-triggered D-type flip-flop that captures data on the rising clock edge and holds it until the next clock pulse. The 74LVC374 is a transparent latch that passes data through when the clock is high and latches data when the clock is low. These are functionally different architectures and are not interchangeable without circuit redesign.

Q: Can I use MC74LCX574DTR2G as a substitute? A: MC74LCX574DTR2G is functionally compatible but has operational constraints. It requires a minimum supply voltage of 2V (vs. 1.65V for the original) and operates only to 85°C maximum (vs. 125°C). Use this part only if your application operates within these narrower ranges. The propagation delay is also slightly higher (8.5 ns vs. 6.8 ns).

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant. The original SN74LVC574APWRE4 is also ROHS3 compliant. All parts maintain Moisture Sensitivity Level 1 (Unlimited).

Q: What is the difference between packaging formats (Cut Tape, Tape & Reel, Bulk)? A: These are supply chain packaging formats that do not affect electrical performance. Cut Tape (CT) and Digi-Reel are suitable for automated pick-and-place assembly. Tape & Reel (TR) is standard for high-volume production. Bulk packaging is for manual handling. Select based on your assembly process requirements.

Q: Which substitute has the best availability? A: SN74LVC574APWR (Texas Instruments) has the highest inventory with 237,968 units in stock, followed by MC74LCX574DTR2G (onsemi) with 85,400 units. Both are active products with reliable supply.

Q: Can I use NXP 74LVC574APW,118 instead of the Texas Instruments part? A: Yes. The NXP part is manufacturer-recommended and maintains full compatibility. It has slightly higher performance (200 MHz vs. 150 MHz clock frequency) and is suitable for direct substitution. Verify that the marginally higher propagation delay (7 ns vs. 6.8 ns) is acceptable for your timing requirements.

Q: What does "Obsolete" product status mean? A: Obsolete status indicates the manufacturer has discontinued production. The SN74LVC574APWRE4 is obsolete, which is why substitutes are necessary. Active substitutes like SN74LVC574APWR ensure long-term design support and production continuity.

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