74VHCT74AM Equivalent & Substitute Parts

Part Overview

The 74VHCT74AM is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-SOIC surface mount package. This device features complementary outputs, positive edge triggering, and set/reset functionality. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across clock frequency, propagation delay, output current, supply voltage, and operating temperature specifications.

Key Parameters

Parameter	74VHCT74AM
Manufacturer	onsemi
Series	74VHCT
Type	D-Type Flip Flop, 2 Element, 1 Bit
Package	14-SOIC (0.154", 3.90mm Width)
Clock Frequency	140 MHz
Max Propagation Delay	8.8ns @ 5V, 50pF
Output Current (High/Low)	8mA / 8mA
Supply Voltage	4.5V ~ 5.5V
Quiescent Current	2 µA
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
Trigger Type	Positive Edge
Output Type	Complementary

Substitute Part Grouping Explanation

Substitute parts are categorized based on electrical parameter compatibility with the 74VHCT74AM. The primary substitution criteria are:

Direct Substitutes (Electrical Equivalents): Parts maintaining identical or superior clock frequency (140 MHz), propagation delay (8.8ns @ 5V, 50pF), output current (8mA), supply voltage range (4.5V ~ 5.5V), and quiescent current (2 µA). These parts are pin-compatible and functionally interchangeable in the 14-SOIC package.

Upgrade Substitutes (Enhanced Performance): Parts with extended operating temperature ranges (-55°C to 125°C or -40°C to 125°C versus -40°C to 85°C), automotive-grade qualifications (AEC-Q100), or improved product status (Active versus Obsolete). These maintain all electrical parameters while offering additional reliability margins.

Similar Alternatives (Reduced Performance): Parts with lower clock frequency (115 MHz or 50 MHz) or higher propagation delay (9.3ns or 35ns). These are functionally similar but operate at reduced speed and may not be suitable for all applications requiring the full 140 MHz specification.

Parameter Comparison

Part Number	Manufacturer	Series	Clock Frequency	Propagation Delay	Output Current	Supply Voltage	Operating Temp	Product Status	Package
74VHCT74AM	onsemi	74VHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-40°C ~ 85°C	Obsolete	14-SOIC
MC74VHCT74ADR2G	onsemi	74VHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-55°C ~ 125°C	Active	14-SOIC
SN74AHCT74DR	Texas Instruments	74AHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-40°C ~ 125°C	Active	14-SOIC
SN74AHCT74D	Texas Instruments	74AHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-40°C ~ 125°C	Discontinued at DiGi Electronics	14-SOIC
74AHCT74D,118	NXP Semiconductors	74AHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-40°C ~ 125°C	Active	14-SOIC
74AHCT74D-Q100J	Nexperia USA Inc.	74AHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-40°C ~ 125°C	Active	14-SOIC
SN74AHCT74MDREP	Texas Instruments	74AHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-55°C ~ 125°C	Active	14-SOIC
SN74AHCT74QDRG4Q1	Texas Instruments	74AHCT	140 MHz	8.8ns @ 5V, 50pF	8mA / 8mA	4.5V ~ 5.5V	-40°C ~ 125°C	Active	14-SOIC
74AHC74D,118	Nexperia USA Inc.	74AHC	115 MHz	9.3ns @ 5V, 50pF	8mA / 8mA	2V ~ 5.5V	-40°C ~ 125°C	Active	14-SOIC
CD74HCT74M	Texas Instruments	74HCT	50 MHz	35ns @ 4.5V, 50pF	4mA / 4mA	4.5V ~ 5.5V	-55°C ~ 125°C	Discontinued at DiGi Electronics	14-SOIC
CD74HCT74M96	Harris Corporation	74HCT	50 MHz	35ns @ 4.5V, 50pF	4mA / 4mA	4.5V ~ 5.5V	-55°C ~ 125°C	Obsolete	14-SOIC

Engineering Selection Recommendations

Primary Recommendation: MC74VHCT74ADR2G (onsemi) is the direct equivalent from the same manufacturer series. It maintains all electrical specifications of the 74VHCT74AM while offering extended operating temperature range (-55°C to 125°C) and active product status. This part is available in Tape & Reel packaging and is RoHS3 compliant.

Secondary Recommendations: SN74AHCT74DR (Texas Instruments) and 74AHCT74D,118 (NXP Semiconductors) are functionally equivalent alternatives with active product status. Both maintain 140 MHz clock frequency and 8.8ns propagation delay. SN74AHCT74DR is available in Cut Tape & Digi-Reel packaging, while 74AHCT74D,118 is supplied in Bulk packaging.

Automotive Applications: For AEC-Q100 qualified designs, select 74AHCT74D-Q100J (Nexperia USA Inc.) or SN74AHCT74QDRG4Q1 (Texas Instruments). Both parts carry automotive-grade qualification and maintain full electrical compatibility.

Extended Temperature Range: SN74AHCT74MDREP (Texas Instruments) and MC74VHCT74ADR2G (onsemi) support -55°C to 125°C operating range, suitable for industrial and harsh environment applications.

Lower-Speed Alternatives: CD74HCT74M (Texas Instruments) and CD74HCT74M96 (Harris Corporation) operate at 50 MHz with 35ns propagation delay. These are suitable only for applications not requiring the full 140 MHz specification. Output current is reduced to 4mA.

Reduced Supply Voltage Range: 74AHC74D,118 (Nexperia USA Inc.) supports 2V to 5.5V supply voltage, enabling operation in lower-voltage systems. Clock frequency is reduced to 115 MHz.

Frequently Asked Questions (FAQ)

Q: Can MC74VHCT74ADR2G directly replace 74VHCT74AM? A: Yes. MC74VHCT74ADR2G is electrically equivalent with identical clock frequency (140 MHz), propagation delay (8.8ns @ 5V, 50pF), output current (8mA), and supply voltage range (4.5V ~ 5.5V). It is pin-compatible in the 14-SOIC package and offers extended operating temperature range and active product status.

Q: What is the difference between 74VHCT and 74AHCT series? A: Both series maintain identical electrical specifications for this dual D-type flip-flop function. The primary difference is manufacturer and product status. 74VHCT is onsemi's series, while 74AHCT is offered by Texas Instruments, NXP Semiconductors, and Nexperia. All maintain 140 MHz clock frequency and 8.8ns propagation delay.

Q: Are 74HCT74 parts suitable replacements? A: 74HCT74 parts (CD74HCT74M, CD74HCT74M96) are not recommended as direct replacements. They operate at only 50 MHz clock frequency with 35ns propagation delay, and provide reduced output current (4mA versus 8mA). Use only if your application does not require the full 140 MHz specification.

Q: What packaging options are available? A: All substitute parts are available in 14-SOIC (0.154", 3.90mm Width) surface mount package. Packaging formats vary by part number: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, Tube, and Bulk. Select based on procurement and assembly requirements.

Q: Which parts are RoHS3 compliant? A: MC74VHCT74ADR2G, SN74AHCT74D, SN74AHCT74DR, 74AHCT74D,118, 74AHCT74D-Q100J, SN74AHCT74MDREP, SN74AHCT74QDRG4Q1, 74AHC74D,118, and CD74HCT74M are RoHS3 compliant. CD74HCT74M96 is RoHS non-compliant.

Q: Can I use 74AHC74D,118 in place of 74VHCT74AM? A: 74AHC74D,118 is a similar alternative with reduced performance. It operates at 115 MHz (versus 140 MHz) and 9.3ns propagation delay (versus 8.8ns). It supports wider supply voltage range (2V ~ 5.5V). Use only if your application tolerates lower clock frequency and slightly higher propagation delay.

Q: Are automotive-qualified versions available? A: Yes. 74AHCT74D-Q100J (Nexperia USA Inc.) and SN74AHCT74QDRG4Q1 (Texas Instruments) are AEC-Q100 qualified for automotive applications. Both maintain full electrical specifications and active product status.

Q: What is the quiescent current specification? A: All substitute parts maintain 2 µA quiescent current, matching the 74VHCT74AM specification. CD74HCT74M and CD74HCT74M96 have higher quiescent current at 4 µA.

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