SN74LVC74APWTG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC74APWTG4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments, housed in a 14-TSSOP surface mount package. This device provides two independent D-type flip-flops with set and reset functionality, operating at clock frequencies up to 150 MHz. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC74APWTG4
Manufacturer	Texas Instruments
Series	74LVC
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 50pF	5.2ns
Voltage - Supply	1.65V ~ 3.6V
Current - Output High, Low	24mA, 24mA
Current - Quiescent (Iq)	10 µA
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LVC74APWTG4 is determined by the following critical parameters:

Package type: 14-TSSOP (0.173", 4.40mm Width)
Functional equivalence: Dual D-type flip-flop with set/reset capability
Clock frequency: 150 MHz minimum
Output type: Complementary
Trigger type: Positive edge
Supply voltage range compatibility
Propagation delay specifications
Output drive capability: 24mA minimum

Substitute parts are grouped into three categories based on parametric alignment:

Parametric Equivalents (Texas Instruments 74LVC Series): Parts with identical electrical specifications and supply voltage range (1.65V ~ 3.6V), differing only in packaging format (Cut Tape, Tape & Reel).

Direct Manufacturer Equivalents (onsemi 74LCX Series): Parts with compatible functional specifications but slightly different propagation delay (7ns vs 5.2ns) and reduced operating temperature range (-40°C ~ 85°C vs -40°C ~ 125°C). Supply voltage minimum increased to 2V.

Manufacturer Recommended Alternatives (Fairchild & NXP): Parts meeting functional requirements with variations in supply voltage range and propagation delay characteristics.

Parameter Comparison

Parameter	SN74LVC74APWTG4 (Main)	SN74LVC74APWR	SN74LVC74APWT	MC74LCX74DTR2G	74LCX74MTCX	74LVC74APW,118	MC74LCX74DTG
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Fairchild Semiconductor	NXP Semiconductors	onsemi
Series	74LVC	74LVC	74LVC	74LCX	74LCX	74LVC	74LCX
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Clock Frequency	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz
Max Propagation Delay @ 3.3V, 50pF	5.2ns	5.2ns	5.2ns	7ns	7ns	5.2ns	7ns
Voltage - Supply	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2V ~ 3.6V	2V ~ 3.6V	1.2V ~ 3.6V	2V ~ 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
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Input Capacitance	5 pF	5 pF	5 pF	7 pF	7 pF	4 pF	7 pF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

First Choice - Parametric Equivalents (SN74LVC74APWR, SN74LVC74APWT): These Texas Instruments 74LVC series parts provide identical electrical specifications to the discontinued SN74LVC74APWTG4. Selection between these two depends on packaging requirements: SN74LVC74APWR is available in Cut Tape and Digi-Reel format with 5200 units in stock, while SN74LVC74APWT is supplied in Tape & Reel format with 2496 units in stock. Both maintain the full operating temperature range (-40°C ~ 125°C) and supply voltage range (1.65V ~ 3.6V). Both are ROHS3 compliant with active product status.

Secondary Choice - NXP 74LVC74APW,118: This NXP Semiconductors part offers identical propagation delay (5.2ns) and extended supply voltage range (1.2V ~ 3.6V), with the highest inventory availability (56962 units). Operating temperature range matches the original part (-40°C ~ 125°C). This part is supplied in bulk packaging format.

Alternative for Extended Temperature Applications: The onsemi MC74LCX74DTR2G and MC74LCX74DTG, along with Fairchild 74LCX74MTCX, are suitable only for applications where the reduced operating temperature range (-40°C ~ 85°C) is acceptable. These parts exhibit slightly degraded propagation delay (7ns vs 5.2ns) and require minimum supply voltage of 2V. Selection among these depends on packaging format: MC74LCX74DTR2G in Tape & Reel (2175 units) or MC74LCX74DTG in Tube (1604 units).

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC74APWR as a direct replacement for SN74LVC74APWTG4?

A: Yes. SN74LVC74APWR is a parametric equivalent with identical electrical specifications. The difference is packaging format: SN74LVC74APWR is supplied in Cut Tape and Digi-Reel format, while the original part was in a specific packaging variant. All functional parameters, supply voltage range, operating temperature range, and propagation delay are identical.

Q: What is the difference between the Texas Instruments 74LVC and onsemi 74LCX series?

A: Both are dual D-type flip-flops in 14-TSSOP packages with 150 MHz clock frequency capability. Key differences: 74LVC series supports supply voltage down to 1.65V and operates to 125°C, with 5.2ns propagation delay. 74LCX series requires minimum 2V supply, operates only to 85°C, and has 7ns propagation delay. The 74LVC series is preferred for low-voltage and extended temperature applications.

Q: Is the NXP 74LVC74APW,118 compatible with my design?

A: Yes, if your application operates within the specified parameters. The NXP part provides identical propagation delay (5.2ns) and operating temperature range (-40°C ~ 125°C) as the original. It supports an even wider supply voltage range (1.2V ~ 3.6V). The only difference is slightly lower input capacitance (4 pF vs 5 pF), which is not a limiting factor for substitution.

Q: Why do some substitute parts have different propagation delays?

A: Propagation delay is a fundamental characteristic of the semiconductor process technology used by each manufacturer. The onsemi 74LCX series uses a different process than Texas Instruments 74LVC, resulting in 7ns delay versus 5.2ns. For timing-critical applications, verify that 7ns delay is acceptable in your circuit before selecting 74LCX alternatives.

Q: What packaging formats are available for these substitutes?

A: SN74LVC74APWR is available in Cut Tape (CT) and Digi-Reel format. SN74LVC74APWT is supplied in Tape & Reel (TR). MC74LCX74DTR2G is in Tape & Reel format. MC74LCX74DTG is in Tube packaging. 74LVC74APW,118 is supplied in Bulk. Select based on your assembly process requirements and minimum order quantities.

Q: Are all these parts RoHS compliant?

A: Texas Instruments 74LVC series parts (SN74LVC74APWR, SN74LVC74APWT) and onsemi 74LCX series parts (MC74LCX74DTR2G, MC74LCX74DTG) are ROHS3 compliant. Fairchild 74LCX74MTCX and NXP 74LVC74APW,118 do not have RoHS status specified in the provided data. Verify RoHS compliance requirements with your supplier if this is a design constraint.

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