SN74LVC1G79DCKRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC1G79DCKRE4 is a single-element D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 5-TSSOP (SC-70-5, SOT-353) surface mount package. This device functions as a standard positive edge-triggered flip-flop with non-inverted output, operating across a supply voltage range of 1.65V to 5.5V. The part is currently discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC1G79DCKRE4
Manufacturer	Texas Instruments
Base Product Number	74LVC1G79
Type	D-Type Flip-Flop, 1 Element, 1 Bit
Clock Frequency	160 MHz
Max Propagation Delay @ 5V, 50pF	4.5ns
Voltage Supply Range	1.65V ~ 5.5V
Output Current (High/Low)	32mA / 32mA
Quiescent Current (Iq)	10 µA
Input Capacitance	4 pF
Operating Temperature	-40°C ~ 125°C
Package / Case	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the SN74LVC1G79DCKRE4 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Base product number: 74LVC1G79
Package type: 5-TSSOP, SC-70-5, SOT-353
Flip-flop type: D-Type, single element, 1 bit
Trigger type: Positive edge
Output type: Non-inverted
Supply voltage range: 1.65V ~ 5.5V
Operating temperature: -40°C ~ 125°C
Mounting type: Surface mount

Parametric Equivalents maintain identical electrical specifications including clock frequency (160 MHz), propagation delay (4.5ns @ 5V, 50pF), output current (32mA), and quiescent current (10 µA). These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or product status (Active vs. Discontinued).

Automotive-Grade Equivalents (SN74LVC1G79QDCKRQ1, SN74LVC1G79QDCKTQ1) maintain identical electrical performance but include AEC-Q100 qualification and automotive-grade designation. These parts feature slightly higher propagation delay (5ns @ 5V, 50pF) and different moisture sensitivity level (MSL 2 vs. MSL 1).

Upgrade Alternatives (74LVC1G79GW,125, 74LVC1G79GV,125, 74LVC1G79GW-Q100H) are manufactured by Nexperia USA Inc. or NXP Semiconductors and offer enhanced performance characteristics including higher clock frequency (500 MHz) and faster propagation delay (3.8ns @ 5V, 50pF). The 74LVC1G79GV,125 uses an alternative package (SC-74A, SOT-753) and is not a direct mechanical substitute.

Parameter Comparison

Part Number	Manufacturer	Product Status	Clock Frequency	Propagation Delay @ 5V, 50pF	Iq (µA)	Package	Grade
SN74LVC1G79DCKRE4	Texas Instruments	Discontinued	160 MHz	4.5ns	10	5-TSSOP, SC-70-5	Standard
SN74LVC1G79DCKR	Texas Instruments	Active	160 MHz	4.5ns	10	5-TSSOP, SC-70-5	Standard
SN74LVC1G79DCKT	Texas Instruments	Active	160 MHz	4.5ns	10	5-TSSOP, SC-70-5	Standard
SN74LVC1G79QDCKRQ1	Texas Instruments	Active	160 MHz	5ns	10	5-TSSOP, SC-70-5	Automotive
SN74LVC1G79QDCKTQ1	Texas Instruments	Active	160 MHz	5ns	10	5-TSSOP, SC-70-5	Automotive
74LVC1G79GW,125	Nexperia USA Inc.	Active	500 MHz	3.8ns	500	5-TSSOP, SC-70-5	Standard
74LVC1G79GV,125	NXP Semiconductors	Active	500 MHz	3.8ns	500	SC-74A, SOT-753	Standard
74LVC1G79GW-Q100H	Nexperia USA Inc.	Active	500 MHz	3.8ns	4	5-TSSOP, SC-70-5	Automotive

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): Select SN74LVC1G79DCKR or SN74LVC1G79DCKT. Both parts are active products from Texas Instruments with identical electrical specifications to the discontinued SN74LVC1G79DCKRE4. The choice between these two depends on packaging format availability: SN74LVC1G79DCKR is supplied in Cut Tape and Digi-Reel format, while SN74LVC1G79DCKT is supplied in Tape & Reel format.

For Automotive Applications: Select SN74LVC1G79QDCKRQ1 or SN74LVC1G79QDCKTQ1. Both parts carry AEC-Q100 qualification and automotive-grade designation. These are suitable for applications requiring automotive-grade components. Propagation delay is slightly higher (5ns vs. 4.5ns), and moisture sensitivity level is MSL 2 (1 Year) rather than MSL 1 (Unlimited).

For Enhanced Performance: Select 74LVC1G79GW,125 or 74LVC1G79GW-Q100H. These Nexperia parts offer superior performance with 500 MHz clock frequency and 3.8ns propagation delay. The 74LVC1G79GW-Q100H includes AEC-Q100 qualification for automotive applications. Both maintain the 5-TSSOP package format. Note that quiescent current is higher (500 µA for standard version, 4 µA for automotive version).

Package Compatibility Note: The 74LVC1G79GV,125 from NXP Semiconductors uses SC-74A (SOT-753) package and is not a direct mechanical substitute for the 5-TSSOP package of the original part.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC1G79DCKR as a direct replacement for SN74LVC1G79DCKRE4? A: Yes. Both parts share identical electrical specifications, package type (5-TSSOP, SC-70-5), and functional characteristics. The primary difference is product status: SN74LVC1G79DCKR is active while SN74LVC1G79DCKRE4 is discontinued. The suffix difference (DCKR vs. DCKRE4) reflects packaging format variations.

Q: What is the difference between the standard-grade and automotive-grade versions? A: Automotive-grade parts (SN74LVC1G79QDCKRQ1, SN74LVC1G79QDCKTQ1) carry AEC-Q100 qualification and are tested to automotive standards. They feature slightly higher propagation delay (5ns vs. 4.5ns) and MSL 2 moisture sensitivity (1 Year) compared to MSL 1 (Unlimited) for standard grades. Use automotive-grade parts only when AEC-Q100 qualification is required.

Q: Are the Nexperia 74LVC1G79GW,125 and 74LVC1G79GW-Q100H suitable replacements? A: These parts are electrically compatible and offer superior performance (500 MHz vs. 160 MHz, 3.8ns vs. 4.5ns propagation delay). Both maintain the 5-TSSOP package. However, quiescent current is significantly higher (500 µA for standard, 4 µA for automotive version vs. 10 µA for the original). Use these only if the application can tolerate higher quiescent current or if enhanced performance is beneficial.

Q: Why is 74LVC1G79GV,125 listed as a substitute if it uses a different package? A: The 74LVC1G79GV,125 is electrically equivalent but uses SC-74A (SOT-753) package instead of 5-TSSOP (SC-70-5). This part is not a direct mechanical substitute and requires PCB layout modification. It is listed as a manufacturer-recommended alternative only for applications where package change is acceptable.

Q: What does the suffix "Q100H" mean in 74LVC1G79GW-Q100H? A: The "Q100H" suffix indicates AEC-Q100 qualification for automotive applications. This part meets automotive-grade standards and is suitable for automotive-grade designs.

Q: Can I interchange Cut Tape (CT) and Tape & Reel (TR) packaging formats? A: Yes, from an electrical and functional perspective. Both SN74LVC1G79DCKR (Cut Tape & Digi-Reel) and SN74LVC1G79DCKT (Tape & Reel) are identical parts. The packaging format difference affects only handling, storage, and supply chain logistics, not component performance or compatibility.

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