SN74LVC74APWRE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC74APWRE4 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	SN74LVC74APWRE4
Manufacturer	Texas Instruments
Series	74LVC
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Clock Frequency	150 MHz
Max Propagation Delay @ 3.3V, 50pF	5.2 ns
Trigger Type	Positive Edge
Output Type	Complementary
Current - Output High/Low	24 mA / 24 mA
Voltage - Supply	1.65V ~ 3.6V
Current - Quiescent (Iq)	10 µA
Input Capacitance	5 pF
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74LVC74APWRE4 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Package type: 14-TSSOP (0.173", 4.40mm Width)
Functional configuration: Dual D-type flip-flop with 2 elements, 1 bit per element
Trigger type: Positive edge
Output type: Complementary
Function: Set (Preset) and Reset capability
Clock frequency: 150 MHz minimum
Supply voltage range: Must encompass or match 1.65V ~ 3.6V
Operating temperature range: Must support -40°C ~ 125°C or equivalent
Surface mount configuration

Acceptable Variation Parameters:

Propagation delay: Up to 7 ns at 3.3V, 50pF (slight increase acceptable)
Input capacitance: Up to 7 pF (slight increase acceptable)
Quiescent current: 10 µA (fixed across all equivalents)
Output current: 24 mA / 24 mA (fixed across all equivalents)
Packaging format: Cut Tape, Tape & Reel, or Bulk acceptable
Manufacturer: Texas Instruments, NXP Semiconductors, onsemi, Toshiba Semiconductor, or Fairchild Semiconductor

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications) and direct equivalents (functionally compatible with minor parameter variations within acceptable engineering tolerances).

Parameter Comparison

Part Number	Manufacturer	Series	Clock Freq (MHz)	Prop Delay @ 3.3V (ns)	Supply Voltage	Temp Range (°C)	Input Cap (pF)	Product Status	Packaging
SN74LVC74APWRE4	Texas Instruments	74LVC	150	5.2	1.65V ~ 3.6V	-40 ~ 125	5	Discontinued	14-TSSOP
SN74LVC74APWR	Texas Instruments	74LVC	150	5.2	1.65V ~ 3.6V	-40 ~ 125	5	Active	14-TSSOP
SN74LVC74APWT	Texas Instruments	74LVC	150	5.2	1.65V ~ 3.6V	-40 ~ 125	5	Active	14-TSSOP
74LVC74APW,118	NXP Semiconductors	74LVC	150	5.2	1.2V ~ 3.6V	-40 ~ 125	4	Active	14-TSSOP
MC74LCX74DTR2G	onsemi	74LCX	150	7	2V ~ 3.6V	-40 ~ 85	7	Active	14-TSSOP
74LCX74FT	Toshiba Semiconductor	74LCX	150	7	1.65V ~ 3.6V	-40 ~ 85	7	Active	14-TSSOP
74LCX74MTCX	Fairchild Semiconductor	74LCX	150	7	2V ~ 3.6V	-40 ~ 85	7	Active	14-TSSOP
MC74LCX74DTG	onsemi	74LCX	150	7	2V ~ 3.6V	-40 ~ 85	7	Active	14-TSSOP

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Recommended Primary Substitutes):

SN74LVC74APWR and SN74LVC74APWT are direct parametric equivalents manufactured by Texas Instruments. Both maintain identical electrical specifications to the SN74LVC74APWRE4, including propagation delay (5.2 ns), supply voltage range (1.65V ~ 3.6V), and operating temperature range (-40°C ~ 125°C). The difference between these two is packaging format: SN74LVC74APWR is supplied in Cut Tape & Digi-Reel format, while SN74LVC74APWT is supplied in Tape & Reel format. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. These substitutes provide the highest compatibility with the discontinued SN74LVC74APWRE4.

Tier 2 - Cross-Manufacturer Parametric Equivalent:

74LVC74APW,118 from NXP Semiconductors maintains the 74LVC series designation and identical clock frequency and propagation delay specifications. This part offers an extended lower supply voltage limit (1.2V minimum versus 1.65V) and slightly reduced input capacitance (4 pF versus 5 pF), both favorable characteristics. Operating temperature range matches the original part (-40°C ~ 125°C). This substitute is suitable for applications requiring the full temperature range and is available in bulk packaging.

Tier 3 - Functional Equivalents with Parameter Variations:

MC74LCX74DTR2G, 74LCX74FT, 74LCX74MTCX, and MC74LCX74DTG are 74LCX series devices that maintain functional equivalence but with acceptable parameter variations. These parts exhibit increased propagation delay (7 ns versus 5.2 ns) and input capacitance (7 pF versus 5 pF). Operating temperature range is reduced to -40°C ~ 85°C, which is unsuitable for applications requiring the full -40°C ~ 125°C range of the original part. Supply voltage ranges vary: MC74LCX74DTR2G and 74LCX74MTCX operate from 2V minimum, while 74LCX74FT extends to 1.65V minimum. These substitutes are appropriate only for applications where the reduced temperature range and increased propagation delay are acceptable.

All substitute parts maintain the 14-TSSOP package configuration, dual D-type flip-flop architecture, complementary output type, and positive edge trigger functionality required for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can I use 74LCX series parts as direct replacements for the SN74LVC74APWRE4?

A: 74LCX series parts (MC74LCX74DTR2G, 74LCX74FT, 74LCX74MTCX, MC74LCX74DTG) are functionally compatible but with important limitations. The propagation delay increases from 5.2 ns to 7 ns, and the operating temperature range is reduced from -40°C ~ 125°C to -40°C ~ 85°C. These substitutes are suitable only for applications that can tolerate the increased delay and do not require operation above 85°C.

Q: What is the difference between SN74LVC74APWR and SN74LVC74APWT?

A: Both parts are identical in electrical specifications and are direct parametric equivalents to the SN74LVC74APWRE4. The only difference is packaging format: SN74LVC74APWR is supplied in Cut Tape & Digi-Reel format, while SN74LVC74APWT is supplied in Tape & Reel format. Selection depends on your procurement and assembly requirements.

Q: Why does the NXP 74LVC74APW,118 have a lower minimum supply voltage?

A: The NXP part specifies a 1.2V minimum supply voltage compared to 1.65V for the Texas Instruments SN74LVC74APWRE4. This represents an extended operating range and is not a limitation. The part remains fully compatible with the original 1.65V ~ 3.6V range and offers additional flexibility for low-voltage applications.

Q: Are all substitute parts ROHS3 compliant?

A: ROHS3 compliance is confirmed for SN74LVC74APWR, SN74LVC74APWT, MC74LCX74DTR2G, and MC74LCX74DTG. Compliance information for 74LVC74APW,118, 74LCX74FT, and 74LCX74MTCX is not provided in the available specifications.

Q: Can I mix different substitute parts in the same design?

A: All substitute parts maintain the same 14-TSSOP package footprint and functional architecture, allowing physical interchangeability on the PCB. However, mixing parts with different propagation delays (5.2 ns versus 7 ns) or operating temperature ranges may introduce timing inconsistencies. For designs sensitive to propagation delay, maintain consistency within a single part number.

Q: What is the moisture sensitivity level for all these parts?

A: All substitute parts specify Moisture Sensitivity Level (MSL) 1 (Unlimited), matching the original SN74LVC74APWRE4. This indicates no moisture sensitivity restrictions for storage and handling.

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