74VHC74MTC Equivalent & Substitute Parts

Part Overview

The 74VHC74MTC is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-TSSOP surface mount packaging. This device features complementary outputs, positive edge triggering, and operates across a 2V to 5.5V supply voltage range with a maximum propagation delay of 9.3ns at 5V with 50pF load. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHC74MTC
Manufacturer	onsemi
Series	74VHC
Type	D-Type Flip Flop
Number of Elements	2
Number of Bits per Element	1
Output Type	Complementary
Trigger Type	Positive Edge
Clock Frequency	115 MHz
Max Propagation Delay @ 5V, 50pF	9.3ns
Current - Output High, Low	8mA, 8mA
Voltage - Supply	2V ~ 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74VHC74MTC is determined by the following critical parameters:

Electrical Compatibility Parameters:

Type: D-Type flip-flop with 2 elements, 1 bit per element
Output Type: Complementary outputs
Trigger Type: Positive edge triggered
Clock Frequency: 115 MHz minimum
Max Propagation Delay: 9.3ns @ 5V, 50pF
Current Output Capability: 8mA high and low
Voltage Supply Range: Must support 2V ~ 5.5V operation
Quiescent Current: 2 µA maximum
Function: Set (Preset) and Reset capability

Mechanical Compatibility Parameters:

Package / Case: 14-TSSOP (0.173", 4.40mm Width) for direct pin-compatible substitution
Mounting Type: Surface Mount

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited) preferred for standard applications

Substitute parts are grouped into three categories: Direct Equivalents (identical electrical and mechanical specifications), Upgrades (enhanced specifications such as extended temperature range or automotive qualification), and Similar Parts (alternative packaging or logic family variants with compatible electrical performance).

Parameter Comparison

Parameter	74VHC74MTC (Main)	SN74AHC74PW	SN74AHC74PWR	74AHC74PW,118	SN74AHC74MPWREP	SN74AHC74QPWRG4Q1	SN74AHC74QPWRQ1
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Series	74VHC	74AHC	74AHC	74AHC	74AHC	74AHC	74AHC
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	2	2	2	2	2	2	2
Number of Bits per Element	1	1	1	1	1	1	1
Output Type	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary	Complementary
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	115 MHz	115 MHz	115 MHz	115 MHz	115 MHz	115 MHz	115 MHz
Max Propagation Delay @ 5V, 50pF	9.3ns	9.3ns	9.3ns	9.3ns	9.3ns	9.3ns	9.3ns
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA
Voltage - Supply	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V
Current - Quiescent (Iq)	2 µA	2 µA	2 µA	2 µA	2 µA	2 µA	2 µA
Input Capacitance	4 pF	2 pF	2 pF	3 pF	2 pF	2 pF	2 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
Grade	Standard	Standard	Standard	Standard	Standard	Automotive	Automotive
Qualification	None	None	None	None	None	AEC-Q100	AEC-Q100

Engineering Selection Recommendations

Primary Recommendation: SN74AHC74PWR

SN74AHC74PWR from Texas Instruments is the preferred direct substitute for the obsolete 74VHC74MTC. This part maintains identical electrical specifications including 115 MHz clock frequency, 9.3ns propagation delay, 8mA output current, and 2V to 5.5V supply voltage range. The part is currently in Active product status with high inventory availability (119,658 units), ensuring long-term supply continuity. It is ROHS3 compliant with MSL 1 (Unlimited) rating and is supplied in Cut Tape and Digi-Reel packaging formats suitable for production environments.

Secondary Recommendation: 74AHC74PW,118

The 74AHC74PW,118 from Nexperia USA Inc. provides an alternative direct equivalent with identical electrical performance and 14-TSSOP packaging. This part is Active with 11,674 units in stock and offers ROHS3 compliance with MSL 1 rating. Input capacitance is 3 pF compared to 2 pF in the SN74AHC74PWR, remaining within acceptable design margins.

Extended Temperature Range Option: SN74AHC74MPWREP

For applications requiring extended temperature operation, the SN74AHC74MPWREP extends the operating range to -55°C to 125°C compared to the standard -40°C to 85°C of the original part. This part carries Last Time Buy status with 12,331 units available and maintains all other electrical specifications. ROHS3 compliance and MSL 1 rating are preserved.

Automotive Grade Options: SN74AHC74QPWRG4Q1 and SN74AHC74QPWRQ1

For automotive applications requiring AEC-Q100 qualification, both SN74AHC74QPWRG4Q1 and SN74AHC74QPWRQ1 are available. The SN74AHC74QPWRG4Q1 maintains MSL 1 (Unlimited) with 2,100 units in stock, while SN74AHC74QPWRQ1 has MSL 3 (168 Hours) with 4,930 units available. Both support -40°C to 125°C operating temperature and are ROHS3 compliant.

Alternative Logic Family: SN74AHCT74MPWREP

The SN74AHCT74MPWREP from the 74AHCT series operates at 140 MHz clock frequency with 8.8ns propagation delay, providing improved timing performance. This part requires 4.5V to 5.5V supply voltage (narrower than the 2V to 5.5V range of the original) and extends temperature operation to -55°C to 125°C. It is Active with 1,036 units in stock and ROHS3 compliant with MSL 1 rating.

Package Variants for Alternative Mounting:

SN74AHC74DBR provides 14-SSOP (0.209", 5.30mm Width) packaging for applications where wider pitch is required. SN74AHC74DGVR offers 14-TFSOP (0.173", 4.40mm Width) packaging as an alternative form factor. Both maintain identical electrical specifications and are Active with substantial inventory.

Frequently Asked Questions (FAQ)

Q: Can SN74AHC74PWR be used as a direct replacement for 74VHC74MTC without circuit modifications?

A: Yes. SN74AHC74PWR is electrically and mechanically compatible with 74VHC74MTC. Both devices feature identical clock frequency (115 MHz), propagation delay (9.3ns @ 5V, 50pF), output current (8mA), supply voltage range (2V to 5.5V), and quiescent current (2 µA). The 14-TSSOP package pinout is identical, enabling direct PCB substitution.

Q: What is the difference between 74AHC and 74AHCT logic families?

A: The 74AHC series operates across 2V to 5.5V supply voltage range, while 74AHCT requires 4.5V to 5.5V. The 74AHCT series achieves higher clock frequency (140 MHz versus 115 MHz) and faster propagation delay (8.8ns versus 9.3ns). Selection depends on whether the application requires the wider voltage range of 74AHC or the improved timing performance of 74AHCT.

Q: Are automotive-grade parts (AEC-Q100) required for all applications?

A: Automotive-grade qualification is required only for applications subject to automotive industry standards. Standard-grade parts such as SN74AHC74PWR are suitable for industrial, consumer, and general-purpose applications. Automotive-grade variants (SN74AHC74QPWRG4Q1, SN74AHC74QPWRQ1) add qualification overhead and are specified only when automotive compliance is mandated.

Q: What is the significance of Moisture Sensitivity Level (MSL) rating?

A: MSL 1 (Unlimited) indicates the component can be stored indefinitely without moisture absorption concerns. MSL 3 (168 Hours) requires the component to be used within 168 hours of package opening or requires baking to remove absorbed moisture. For standard production environments with controlled storage, MSL 1 parts are preferred to eliminate moisture management procedures.

Q: Can parts with different input capacitance values be substituted?

A: Input capacitance differences (ranging from 2 pF to 4 pF across the substitute parts) are generally acceptable in digital logic applications. These variations have minimal impact on circuit timing and signal integrity in standard TTL/CMOS logic designs. Verification is recommended only in high-speed or noise-sensitive applications where input loading effects are critical.

Q: What packaging options are available for the 74AHC74 logic function?

A: The 74AHC74 function is available in three package variants: 14-TSSOP (0.173", 4.40mm Width) for standard surface mount applications, 14-SSOP (0.209", 5.30mm Width) for wider pitch requirements, and 14-TFSOP (0.173", 4.40mm Width) as an alternative form factor. All variants maintain identical electrical specifications and pin assignments.

Q: Is extended temperature range operation (-55°C to 125°C) necessary for standard applications?

A: Extended temperature range is required only for applications operating in extreme environmental conditions or industrial settings with wide temperature variation. Standard applications operating within -40°C to 85°C or -40°C to 125°C ranges use standard-grade parts. Extended range variants such as SN74AHC74MPWREP are specified only when application requirements explicitly demand -55°C minimum operation.

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