74VHCT74AMX Equivalent & Substitute Parts

Part Overview

The 74VHCT74AMX is a dual D-type flip-flop logic integrated circuit manufactured by onsemi in 14-SOIC surface mount packaging. This device provides two independent D-type flip-flops with set and reset functionality, complementary outputs, and positive edge triggering. 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	74VHCT74AMX
Manufacturer	onsemi
Series	74VHCT
Type	D-Type Flip-Flop, Dual 1-Bit
Package	14-SOIC (0.154", 3.90mm Width)
Clock Frequency	140 MHz
Max Propagation Delay	8.8ns @ 5V, 50pF
Supply Voltage	4.5V ~ 5.5V
Output Current	8mA (High), 8mA (Low)
Quiescent Current	2 µA
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 74VHCT74AMX is determined by the following critical parameters:

Electrical Compatibility Requirements:

D-Type flip-flop architecture with dual 1-bit configuration
Clock frequency of 140 MHz minimum
Propagation delay of 8.8ns or better @ 5V, 50pF
Supply voltage range encompassing 4.5V ~ 5.5V
Output current capability of 8mA minimum (both high and low)
Quiescent current of 2 µA or lower
Positive edge trigger type
Complementary output configuration

Mechanical Compatibility Requirements:

14-SOIC (0.154", 3.90mm Width) package
Surface mount mounting type

Compliance Requirements:

ROHS3 compliance
Moisture Sensitivity Level 1 (Unlimited)

Substitute parts are grouped into three categories: direct equivalents (identical electrical and mechanical specifications), similar parts (minor parameter variations within acceptable tolerance), and upgrade parts (enhanced specifications with backward compatibility).

Parameter Comparison

Part Number	Manufacturer	Series	Clock Freq (MHz)	Prop Delay (ns)	Supply Voltage	Output Current (mA)	Iq (µA)	Temp Range (°C)	Package	Status	Packaging Type
74VHCT74AMX	onsemi	74VHCT	140	8.8	4.5~5.5V	8/8	2	-40~85	14-SOIC	Obsolete	Cut Tape
MC74VHCT74ADR2G	onsemi	74VHCT	140	8.8	4.5~5.5V	8/8	2	-55~125	14-SOIC	Active	Tape & Reel
SN74AHCT74D	Texas Instruments	74AHCT	140	8.8	4.5~5.5V	8/8	2	-40~125	14-SOIC	Discontinued	Tube
SN74AHCT74DR	Texas Instruments	74AHCT	140	8.8	4.5~5.5V	8/8	2	-40~125	14-SOIC	Active	Cut Tape
SN74AHCT74QDRQ1	Texas Instruments	74AHCT	140	8.8	4.5~5.5V	8/8	2	-40~125	14-SOIC	Active	Tape & Reel
74AHCT74D,118	NXP Semiconductors	74AHCT	140	8.8	4.5~5.5V	8/8	2	-40~125	14-SOIC	Active	Bulk
74AHCT74D-Q100J	Nexperia USA Inc.	74AHCT	140	8.8	4.5~5.5V	8/8	2	-40~125	14-SOIC	Active	Tape & Reel
SN74AHCT74MDREP	Texas Instruments	74AHCT	140	8.8	4.5~5.5V	8/8	2	-55~125	14-SOIC	Active	Tape & Reel
SN74AHCT74QDRG4Q1	Texas Instruments	74AHCT	140	8.8	4.5~5.5V	8/8	2	-40~125	14-SOIC	Active	Tape & Reel
74AHC74D,118	Nexperia USA Inc.	74AHC	115	9.3	2~5.5V	8/8	2	-40~125	14-SOIC	Active	Tape & Reel
CD74HCT74M	Texas Instruments	74HCT	50	35	4.5~5.5V	4/4	4	-55~125	14-SOIC	Discontinued	Tube

Engineering Selection Recommendations

Primary Recommendation: MC74VHCT74ADR2G

The MC74VHCT74ADR2G is the closest functional equivalent to the 74VHCT74AMX. Both devices share the 74VHCT series designation and are manufactured by onsemi. Electrical specifications are identical, including 140 MHz clock frequency, 8.8ns propagation delay, and 8mA output current. The MC74VHCT74ADR2G offers an extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and is currently in active production status. Packaging is Tape & Reel format rather than Cut Tape, which may require adjustment to procurement and handling procedures.

Secondary Recommendation: SN74AHCT74DR

The SN74AHCT74DR from Texas Instruments provides identical electrical performance to the 74VHCT74AMX with 140 MHz operation and 8.8ns propagation delay. This part is actively produced and available in Cut Tape packaging, matching the original packaging format. The 74AHCT series is a widely supported logic family with established supply chains. Operating temperature range extends to 125°C maximum.

Automotive-Grade Options: SN74AHCT74QDRQ1 and 74AHCT74D-Q100J

For applications requiring automotive qualification, SN74AHCT74QDRQ1 (Texas Instruments) and 74AHCT74D-Q100J (Nexperia USA Inc.) both meet AEC-Q100 standards. These parts maintain identical electrical specifications and are actively produced. The automotive qualification adds process and reliability documentation suitable for automotive and high-reliability applications.

Extended Temperature Option: SN74AHCT74MDREP

The SN74AHCT74MDREP from Texas Instruments extends the operating temperature range to -55°C to 125°C while maintaining all electrical specifications of the 74VHCT74AMX. This part is suitable for applications requiring enhanced low-temperature performance.

Lower-Speed Alternative: 74AHC74D,118

The 74AHC74D,118 from Nexperia USA Inc. operates at 115 MHz with 9.3ns propagation delay, representing a minor performance reduction. This part supports a wider supply voltage range (2V to 5.5V) and is suitable for applications where the lower clock frequency is acceptable. This option provides flexibility for designs with reduced speed requirements.

Not Recommended: CD74HCT74M

The CD74HCT74M from Texas Instruments is discontinued at DiGi Electronics and exhibits significantly degraded electrical performance (50 MHz clock frequency, 35ns propagation delay, 4mA output current). This part does not meet the electrical requirements of the 74VHCT74AMX and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74VHCT74AMX with MC74VHCT74ADR2G?

A: Yes. Both parts are onsemi 74VHCT series devices with identical electrical specifications. The primary difference is packaging format (Tape & Reel versus Cut Tape) and extended operating temperature range on the MC74VHCT74ADR2G. Electrical performance, pinout, and functional behavior are equivalent.

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

A: Both series meet the same electrical specifications for this dual D-type flip-flop function, including 140 MHz clock frequency and 8.8ns propagation delay. The 74AHCT series from Texas Instruments and other manufacturers is actively produced, while the 74VHCT series from onsemi is becoming obsolete. Substitution between these series is electrically valid.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT), Tape & Reel (TR), Tube, and Bulk packaging formats do not affect electrical performance. Packaging format impacts procurement, handling, and storage procedures. The 14-SOIC package dimensions and pinout remain identical across all packaging options.

Q: Can I use 74AHC74D,118 as a substitute?

A: The 74AHC74D,118 is electrically compatible but operates at reduced speed (115 MHz versus 140 MHz) with longer propagation delay (9.3ns versus 8.8ns). This part is suitable only if your application does not require the full 140 MHz performance specification. The wider supply voltage range (2V to 5.5V) may provide additional design flexibility.

Q: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive industry standard qualification that certifies component reliability for automotive applications. Parts like SN74AHCT74QDRQ1 and 74AHCT74D-Q100J carry this certification and include additional process documentation and reliability testing. Use these parts for automotive or high-reliability applications where such certification is required.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts listed in the Parameter Comparison table are ROHS3 compliant. Compliance status is maintained across the 74VHCT and 74AHCT series families.

Q: What is the difference between SN74AHCT74DR and SN74AHCT74MDREP?

A: Both are Texas Instruments 74AHCT series parts with identical electrical specifications. The SN74AHCT74MDREP extends the operating temperature range to -55°C to 125°C, compared to -40°C to 125°C for the SN74AHCT74DR. Select SN74AHCT74MDREP if your application requires operation below -40°C.

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