SN74LVC74ADG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC74ADG4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 14-SOIC package. This component features complementary outputs, positive edge triggering, and operates across a 1.65V to 3.6V supply voltage range with a maximum propagation delay of 5.2ns at 3.3V with 50pF load. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Part Number	SN74LVC74ADG4
Manufacturer	Texas Instruments
Type	D-Type Flip-Flop, 2 Element, 1 Bit
Package	14-SOIC (0.154", 3.90mm Width)
Clock Frequency	150 MHz
Propagation Delay	5.2ns @ 3.3V, 50pF
Supply Voltage	1.65V ~ 3.6V
Output Current	24mA (High), 24mA (Low)
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SN74LVC74ADG4 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Functional type: D-Type flip-flop with 2 elements, 1 bit per element
Output configuration: Complementary outputs
Trigger mechanism: Positive edge
Package form factor: 14-SOIC (0.154", 3.90mm Width)
Clock frequency capability: 150 MHz minimum
Supply voltage range: Must encompass or match 1.65V ~ 3.6V
Output drive capability: 24mA minimum (both high and low)
Operating temperature range: -40°C ~ 125°C minimum

Substitute parts are grouped into two categories:

Category 1 - Direct Manufacturer Equivalents (Texas Instruments 74LVC Series): Parts maintaining identical electrical specifications, propagation delay (5.2ns @ 3.3V, 50pF), and full temperature range (-40°C ~ 125°C). These include SN74LVC74ADR and SN74LVC74AD, differentiated only by packaging format (Cut Tape/Digi-Reel vs. Tube).

Category 2 - Cross-Manufacturer Functional Equivalents (74LCX Series): Parts from Fairchild Semiconductor and onsemi that maintain core functionality and package compatibility but with relaxed propagation delay specifications (7ns @ 3.3V, 50pF) and reduced operating temperature range (-40°C ~ 85°C). These include 74LCX74M, MC74LCX74DG, and MC74LCX74DR2G.

Category 3 - Parametric Equivalents (Texas Instruments 74LVC Series, Alternative Packaging): Parts with identical electrical performance to Category 1 but with different product status or packaging availability, including SN74LVC74ADE4.

Parameter Comparison

Parameter	SN74LVC74ADG4	SN74LVC74ADR	SN74LVC74AD	74LCX74M	74LVC74AD,118	MC74LCX74DG	MC74LCX74DR2G	SN74LVC74ADE4
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Fairchild Semiconductor	NXP Semiconductors	onsemi	onsemi	Texas Instruments
Series	74LVC	74LVC	74LVC	74LCX	74LVC	74LCX	74LCX	74LVC
Type	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit	D-Type, 2 Element, 1 Bit
Package	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SO	14-SOIC	14-SOIC	14-SOIC
Clock Frequency	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz
Propagation Delay @ 3.3V, 50pF	5.2ns	5.2ns	5.2ns	7ns	5.2ns	7ns	7ns	5.2ns
Supply Voltage Range	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V	1.2V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	1.65V ~ 3.6V
Output Current (High/Low)	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA	24mA / 24mA
Quiescent Current	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA	10 µA
Input Capacitance	5 pF	5 pF	5 pF	7 pF	4 pF	7 pF	7 pF	5 pF
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Discontinued at DiGi Electronics
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications:

SN74LVC74ADR and SN74LVC74AD are the primary substitutes, both from Texas Instruments with active product status. These parts maintain identical electrical performance (5.2ns propagation delay, -40°C ~ 125°C operating range) and are fully compatible with the original SN74LVC74ADG4. Selection between these two depends on packaging requirements: SN74LVC74ADR is supplied in Cut Tape/Digi-Reel format, while SN74LVC74AD is supplied in Tube format.

For Extended Supply Voltage Range:

The 74LVC74AD,118 from NXP Semiconductors offers an extended lower supply voltage limit (1.2V vs. 1.65V) while maintaining identical propagation delay and full temperature range. This part is suitable for applications requiring operation below 1.65V.

For Cross-Manufacturer Compatibility with Performance Trade-offs:

The 74LCX series parts (74LCX74M from Fairchild Semiconductor, MC74LCX74DG and MC74LCX74DR2G from onsemi) provide functional equivalence with relaxed propagation delay specifications (7ns vs. 5.2ns) and reduced operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C). These substitutes are appropriate for applications where the additional propagation delay and reduced temperature range are acceptable.

For Parametric Equivalence with Alternative Availability:

SN74LVC74ADE4 from Texas Instruments maintains identical electrical specifications to the original part but carries a discontinued status at DiGi Electronics, limiting its suitability for new designs despite technical equivalence.

All substitute parts maintain ROHS3 compliance where specified and are housed in compatible 14-SOIC package form factors, ensuring mechanical interchangeability in surface-mount applications.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC74ADR as a direct replacement for SN74LVC74ADG4?

A: Yes. SN74LVC74ADR is a direct electrical and functional equivalent with identical propagation delay (5.2ns @ 3.3V, 50pF), supply voltage range (1.65V ~ 3.6V), and operating temperature range (-40°C ~ 125°C). The only difference is packaging format (Cut Tape/Digi-Reel vs. the original format). Both are housed in 14-SOIC packages and are mechanically interchangeable.

Q: What is the difference between the 74LVC and 74LCX series substitutes?

A: The 74LVC series (Texas Instruments, NXP) maintains faster propagation delay (5.2ns) and extended operating temperature range (-40°C ~ 125°C). The 74LCX series (Fairchild Semiconductor, onsemi) has slower propagation delay (7ns) and reduced operating temperature range (-40°C ~ 85°C). Both series are functionally equivalent D-type flip-flops with identical package form factors. Selection depends on timing and temperature requirements of the application.

Q: Are all substitute parts in the same package?

A: Nearly all substitutes use the 14-SOIC (0.154", 3.90mm Width) package, ensuring mechanical compatibility. The exception is 74LVC74AD,118 from NXP, which uses a 14-SO package. While electrically equivalent, verify PCB footprint compatibility before substitution.

Q: Can I use MC74LCX74DR2G in a high-temperature application requiring -40°C ~ 125°C operation?

A: No. MC74LCX74DR2G is rated only to 85°C maximum operating temperature. For applications requiring full -40°C ~ 125°C operation, use SN74LVC74ADR, SN74LVC74AD, 74LVC74AD,118, or SN74LVC74ADE4.

Q: What does "Active" product status mean for substitution purposes?

A: Active status indicates the part is currently manufactured and available from the supplier. This ensures long-term availability for production and design continuity. The original SN74LVC74ADG4 is obsolete, making active-status substitutes necessary for ongoing support.

Q: Is the extended supply voltage range of 74LVC74AD,118 (1.2V ~ 3.6V) compatible with my 1.65V ~ 3.6V design?

A: Yes. The 74LVC74AD,118 supports the full 1.65V ~ 3.6V range required by your design, plus additional operation down to 1.2V. This part is fully compatible and offers greater flexibility for future low-voltage applications.

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