74VHCT74AMTC Equivalent & Substitute Parts

Part Overview

The 74VHCT74AMTC is a dual D-type flip-flop logic IC manufactured by onsemi in 14-TSSOP surface mount packaging. This device features complementary outputs, positive edge triggering, and operates across a 4.5V to 5.5V supply voltage range with a maximum clock frequency of 140 MHz. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHCT74AMTC
Manufacturer	onsemi
Category	Logic
Type	D-Type Flip-Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Clock Frequency	140 MHz
Max Propagation Delay @ 5V, 50pF	8.8 ns
Trigger Type	Positive Edge
Current - Output High/Low	8 mA / 8 mA
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Iq)	2 µA
Input Capacitance	4 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHCT74AMTC is determined by the following critical parameters:

Functional Compatibility Requirements:

Type: D-Type flip-flop with dual elements
Number of Elements: 2
Number of Bits per Element: 1
Output Type: Complementary
Trigger Type: Positive Edge
Function: Set (Preset) and Reset capability

Electrical Compatibility Requirements:

Clock Frequency: 140 MHz minimum
Max Propagation Delay @ 5V, 50pF: 8.8 ns maximum
Current - Output High/Low: 8 mA minimum
Voltage - Supply: Must support 4.5V ~ 5.5V range
Current - Quiescent (Iq): 2 µA maximum

Physical Compatibility Requirements:

Package / Case: 14-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount

Substitute parts are categorized as Direct, Upgrade, or Similar based on parameter alignment with these criteria.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency (MHz)	Max Propagation Delay @ 5V, 50pF (ns)	Voltage - Supply (V)	Operating Temperature (°C)	Package	Product Status
74VHCT74AMTC	onsemi	74VHCT	140	8.8	4.5 ~ 5.5	-40 ~ 85	14-TSSOP	Obsolete
74VHCT74AMTCX	Fairchild Semiconductor	74VHCT	140	8.8	4.5 ~ 5.5	-40 ~ 85	14-TSSOP	Active
SN74AHCT74PW	Texas Instruments	74AHCT	140	11.4	4.5 ~ 5.5	-40 ~ 125	14-TSSOP	Discontinued at DiGi Electronics
SN74AHCT74PWG4	Texas Instruments	74AHCT	140	8.8	4.5 ~ 5.5	-40 ~ 125	14-TSSOP	Discontinued at DiGi Electronics
SN74AHCT74PWR	Texas Instruments	74AHCT	140	8.8	4.5 ~ 5.5	-40 ~ 125	14-TSSOP	Active
74AHCT74PW,118	NXP Semiconductors	74AHCT	140	8.8	4.5 ~ 5.5	-40 ~ 125	14-TSSOP	Active
SN74AHCT74MPWREP	Texas Instruments	74AHCT	140	8.8	4.5 ~ 5.5	-55 ~ 125	14-TSSOP	Active
SN74AHCT74QPWRQ1	Texas Instruments	74AHCT	140	8.8	4.5 ~ 5.5	-40 ~ 125	14-TSSOP	Active
74AHC74PW-Q100J	Nexperia USA Inc.	74AHC	115	9.3	2 ~ 5.5	-40 ~ 125	14-TSSOP	Active
74VHC74FT	Toshiba Semiconductor and Storage	TC74VHC	115	9.3	2 ~ 5.5	-40 ~ 85	14-TSSOP	Active
SN74AHC74DBR	Texas Instruments	74AHC	115	9.3	2 ~ 5.5	-40 ~ 125	14-SSOP	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

74VHCT74AMTCX (Fairchild Semiconductor) is the primary direct substitute. It maintains identical electrical specifications and package format while offering active product status. This part is recommended as the first choice for direct replacement in existing designs.

Upgrade Substitutes (Enhanced Specifications):

SN74AHCT74PWR, SN74AHCT74PWG4, 74AHCT74PW,118, SN74AHCT74MPWREP, and SN74AHCT74QPWRQ1 are upgrade options from the 74AHCT series. These parts meet or exceed the electrical performance requirements of the original part while offering extended operating temperature ranges (-40°C to 125°C versus -40°C to 85°C). SN74AHCT74QPWRQ1 includes AEC-Q100 automotive qualification and is suitable for automotive applications. SN74AHCT74MPWREP extends the lower operating temperature to -55°C, providing enhanced cold-temperature performance.

Similar Substitutes (Functional Equivalence with Trade-offs):

74AHC74PW-Q100J and 74VHC74FT are functionally equivalent parts from the 74AHC and TC74VHC series respectively. These parts operate at reduced clock frequencies (115 MHz versus 140 MHz) and exhibit slightly higher propagation delays (9.3 ns versus 8.8 ns). Both support extended supply voltage ranges (2V to 5.5V) and are suitable for applications where the lower performance specifications are acceptable. 74AHC74PW-Q100J includes AEC-Q100 automotive qualification.

SN74AHC74DBR is available in 14-SSOP packaging (0.209", 5.30mm Width) rather than 14-TSSOP. This package variant requires PCB layout modification and is suitable only when board redesign is feasible.

Compliance and Certification:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status where specified. Parts designated with AEC-Q100 qualification (SN74AHCT74QPWRQ1 and 74AHC74PW-Q100J) are suitable for automotive applications requiring formal qualification.

Frequently Asked Questions (FAQ)

Q: Can I use 74VHCT74AMTCX as a direct replacement for 74VHCT74AMTC?

A: Yes. 74VHCT74AMTCX is a direct substitute with identical electrical specifications, package format, and functional characteristics. The primary difference is active product status versus obsolete status.

Q: What is the difference between 74VHCT and 74AHCT series parts?

A: Both series are dual D-type flip-flops with complementary outputs and positive edge triggering. The 74AHCT series offers extended operating temperature ranges (-40°C to 125°C versus -40°C to 85°C) and is generally more widely available. Electrical performance is equivalent or superior in the 74AHCT variants.

Q: Can I use 74AHC74PW-Q100J in place of 74VHCT74AMTC?

A: 74AHC74PW-Q100J is functionally compatible but operates at reduced performance specifications. Clock frequency is 115 MHz versus 140 MHz, and propagation delay is 9.3 ns versus 8.8 ns. This part is suitable only if your application does not require the higher performance of the original part.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive industry qualification standard. Parts bearing this designation (SN74AHCT74QPWRQ1 and 74AHC74PW-Q100J) have undergone formal testing and validation for automotive applications and are suitable for use in automotive designs.

Q: Why is SN74AHC74DBR listed as a similar substitute if the package is different?

A: SN74AHC74DBR uses 14-SSOP packaging (0.209", 5.30mm Width) instead of 14-TSSOP (0.173", 4.40mm Width). While functionally equivalent, this package difference requires PCB layout modification. It is listed for reference only and should be considered only when board redesign is acceptable.

Q: What is the significance of the extended temperature range in SN74AHCT74MPWREP?

A: SN74AHCT74MPWREP operates from -55°C to 125°C, extending the lower temperature limit by 15°C compared to standard parts. This is beneficial for applications requiring enhanced cold-temperature performance or operation in extreme environmental conditions.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed maintain RoHS3 compliance where specified in the provided data. Compliance status is documented in the parameter comparison table.

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