SN74HCT74PW Equivalent & Substitute Parts

Part Overview

The SN74HCT74PW is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in 14-TSSOP surface mount packaging. This component functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain functional equivalence through matching logic family characteristics, package form factor, and electrical performance within specified operating ranges.

Key Parameters

Parameter	Value
Logic Family	74HCT
Function	Dual D-Type Flip-Flop with Set/Preset and Reset
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HCT74PW is determined by strict adherence to the following criteria:

Primary Substitution Criteria:

Logic family compatibility (74HCT, 74VHCT series)
Identical package form factor (14-TSSOP)
Matching functional architecture (dual D-type flip-flop, complementary outputs, positive edge trigger)
Voltage supply range overlap (4.5V ~ 5.5V minimum requirement)
Surface mount mounting type

Secondary Compatibility Factors:

Clock frequency performance
Propagation delay specifications
Output current drive capability
Quiescent current consumption
Input capacitance
Operating temperature range

Parts are grouped into two categories based on logic family series: 74HCT series substitutes (direct family match) and 74VHCT series substitutes (higher performance variant with enhanced speed characteristics).

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency	Max Propagation Delay @ V, CL	Output Current (High/Low)	Quiescent Current	Operating Temperature	Product Status	Packaging
SN74HCT74PW	Texas Instruments	74HCT	46 MHz	25ns @ 5.5V, 50pF	4mA / 4mA	4 µA	-40°C ~ 85°C	Discontinued	Tube
SN74HCT74PWR	Texas Instruments	74HCT	46 MHz	25ns @ 5.5V, 50pF	4mA / 4mA	4 µA	-40°C ~ 85°C	Active	Cut Tape & Digi-Reel
74HCT74PW,118	Nexperia USA Inc.	74HCT	59 MHz	44ns @ 4.5V, 50pF	4mA / 4mA	40 µA	-40°C ~ 125°C	Active	Cut Tape & Digi-Reel
74HCT74PW-Q100,118	Nexperia USA Inc.	74HCT	59 MHz	44ns @ 4.5V, 50pF	4mA / 4mA	40 µA	-40°C ~ 125°C	Active	Tape & Reel (Automotive AEC-Q100)
74VHCT74AMTCX	Fairchild Semiconductor	74VHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	2 µA	-40°C ~ 85°C	Active	Surface Mount
MC74VHCT74ADTR2G	onsemi	74VHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	2 µA	-55°C ~ 125°C	Active	Tape & Reel
MM74HCT74MTC	Fairchild Semiconductor	74HCT	27 MHz	35ns @ 5V, 50pF	4.8mA / 4.8mA	2 µA	-40°C ~ 85°C	Active	Bulk
MM74HCT74MTCX	Fairchild Semiconductor	74HCT	27 MHz	35ns @ 5V, 50pF	4.8mA / 4.8mA	2 µA	-40°C ~ 85°C	Active	Bulk

Engineering Selection Recommendations

Direct Replacement (74HCT Series): SN74HCT74PWR is the primary direct substitute, manufactured by Texas Instruments with identical electrical specifications to the discontinued SN74HCT74PW. Both parts share the same clock frequency (46 MHz), propagation delay (25ns @ 5.5V, 50pF), and output current ratings. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). This part maintains active product status and full RoHS3 compliance.

Extended Temperature Range Alternative: 74HCT74PW,118 from Nexperia USA Inc. provides an active substitute with extended operating temperature range (-40°C ~ 125°C) compared to the original specification (-40°C ~ 85°C). This part is suitable for applications requiring broader thermal performance. Note that quiescent current increases to 40 µA and propagation delay extends to 44ns @ 4.5V, 50pF.

Automotive Grade Option: 74HCT74PW-Q100,118 from Nexperia USA Inc. is qualified to AEC-Q100 automotive standards and packaged in Tape & Reel format. This variant maintains the same electrical characteristics as 74HCT74PW,118 and is appropriate for automotive and high-reliability applications.

High-Performance Alternatives (74VHCT Series): 74VHCT74AMTCX (Fairchild Semiconductor) and MC74VHCT74ADTR2G (onsemi) represent higher-performance logic family variants. These parts deliver significantly improved speed (140 MHz clock frequency, 8.8ns propagation delay) and lower quiescent current (2 µA). The 74VHCT series is pin-compatible and functionally equivalent but operates at enhanced performance levels. MC74VHCT74ADTR2G extends the operating temperature range to -55°C ~ 125°C and includes RoHS3 compliance.

Standard Performance Alternatives (74HCT Series): MM74HCT74MTC and MM74HCT74MTCX from Fairchild Semiconductor are functionally equivalent 74HCT series parts available in bulk packaging. These parts operate at lower clock frequency (27 MHz) and exhibit longer propagation delay (35ns @ 5V, 50pF) compared to the original specification, making them suitable for applications with relaxed timing requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT74PWR directly replace SN74HCT74PW? A: Yes. SN74HCT74PWR is a direct functional equivalent manufactured by Texas Instruments with identical electrical specifications. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). Both parts are RoHS3 compliant and operate within the same voltage supply range (4.5V ~ 5.5V) and temperature range (-40°C ~ 85°C).

Q: What is the difference between 74HCT and 74VHCT series substitutes? A: The 74VHCT series represents a higher-performance logic family variant. 74VHCT parts deliver faster clock frequency (140 MHz versus 46 MHz), shorter propagation delay (8.8ns versus 25ns), higher output current drive (8mA versus 4mA), and lower quiescent current (2 µA versus 4 µA). Both families are pin-compatible and functionally equivalent, but 74VHCT is suitable for applications requiring enhanced speed performance.

Q: Are all substitute parts available in the same 14-TSSOP package? A: Yes. All listed substitute parts are packaged in 14-TSSOP (0.173", 4.40mm Width) surface mount form factor, ensuring mechanical and electrical compatibility with the original SN74HCT74PW footprint.

Q: Which substitute part has the widest operating temperature range? A: MC74VHCT74ADTR2G from onsemi operates across -55°C ~ 125°C, providing the broadest temperature coverage. This part is suitable for extreme environment applications and includes RoHS3 compliance.

Q: Is the Nexperia 74HCT74PW-Q100,118 suitable for automotive applications? A: Yes. The 74HCT74PW-Q100,118 is qualified to AEC-Q100 automotive standards and is appropriate for automotive and high-reliability applications requiring formal qualification documentation.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in multiple packaging formats: Cut Tape & Digi-Reel (SN74HCT74PWR, 74HCT74PW,118), Tape & Reel (74HCT74PW-Q100,118, MC74VHCT74ADTR2G), and Bulk (MM74HCT74MTC, MM74HCT74MTCX). Selection depends on production volume and supply chain requirements.

Q: Do all substitute parts maintain RoHS3 compliance? A: Most substitute parts are RoHS3 compliant. SN74HCT74PWR, 74HCT74PW,118, 74HCT74PW-Q100,118, and MC74VHCT74ADTR2G explicitly state ROHS3 compliance. Fairchild Semiconductor parts (74VHCT74AMTCX, MM74HCT74MTC, MM74HCT74MTCX) do not list RoHS status in provided specifications.

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