74VHCT574AMTC Equivalent & Substitute Parts

Part Overview

The 74VHCT574AMTC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates at a clock frequency of 130 MHz with tri-state, non-inverted outputs suitable for digital logic applications requiring edge-triggered data latching.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHCT574AMTC
Manufacturer	onsemi
Series	74VHCT
Type	D-Type Flip-Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	130 MHz
Max Propagation Delay @ 5V, 50pF	10.4 ns
Trigger Type	Positive Edge
Current - Output High, Low	8 mA, 8 mA
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Iq)	4 µA
Input Capacitance	4 pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-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

Substitute parts for the 74VHCT574AMTC are selected based on the following critical parameters that determine functional and mechanical compatibility:

Core Functional Parameters:

Type: D-Type Flip-Flop with 1 element, 8-bit configuration
Output Type: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Supply Voltage Range: Must support 4.5V ~ 5.5V operation
Mounting Type: Surface Mount

Mechanical Parameters:

Package / Case: 20-TSSOP (0.173", 4.40mm Width) preferred; 20-SSOP (0.209", 5.30mm Width) acceptable with PCB layout adjustment; 20-TVSOP/20-TFSOP acceptable with footprint compatibility verification

Performance Parameters:

Clock Frequency: Minimum 115 MHz acceptable (lower than original 130 MHz but within functional range)
Max Propagation Delay @ 5V, 50pF: Maximum 10.6 ns acceptable
Current Output: 8 mA minimum for both high and low states
Quiescent Current: 4 µA maximum

Compliance Parameters:

RoHS3 Compliant required
MSL 1 (Unlimited) required

Substitutes are grouped by series (74AHC, 74AHCT, 74HCT) based on voltage compatibility and performance characteristics. Active product status substitutes are prioritized over discontinued or obsolete alternatives.

Parameter Comparison

Parameter	74VHCT574AMTC	74AHC574PW,118	74AHCT574PW,118	CD74HCT574PWR	SN74AHC574DBR	SN74AHC574PWR	SN74AHCT574DBR	SN74AHCT574DGVR	SN74AHCT574PWR
Manufacturer	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Series	74VHCT	74AHC	74AHCT	74HCT	74AHC	74AHC	74AHCT	74AHCT	74AHCT
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Clock Frequency	130 MHz	115 MHz	115 MHz	60 MHz	115 MHz	115 MHz	115 MHz	115 MHz	115 MHz
Max Propagation Delay @ 5V, 50pF	10.4 ns	10.6 ns	10.6 ns	33 ns	10.6 ns	10.6 ns	10.6 ns	10.6 ns	10.6 ns
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Current - Output High, Low	8 mA, 8 mA	8 mA, 8 mA	8 mA, 8 mA	6 mA, 6 mA	8 mA, 8 mA	8 mA, 8 mA	8 mA, 8 mA	8 mA, 8 mA	8 mA, 8 mA
Voltage - Supply	4.5V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	4 µA	4 µA	4 µA	8 µA	4 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	4 pF	3 pF	3 pF	10 pF	3 pF	3 pF	3 pF	3 pF	3 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-SSOP (0.209", 5.30mm)	20-TSSOP (0.173", 4.40mm)	20-SSOP (0.209", 5.30mm)	20-TFSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

74AHCT574PW,118 (Nexperia) and SN74AHCT574PWR (Texas Instruments) are the preferred substitutes. Both maintain the 4.5V ~ 5.5V supply voltage range of the original part, feature identical 8-bit D-type tri-state output configuration, and are classified as active products with ROHS3 compliance and MSL 1 rating. These parts operate at 115 MHz clock frequency with 10.6 ns maximum propagation delay, meeting the functional requirements of the 74VHCT574AMTC. The 20-TSSOP package footprint is identical to the original part.

Secondary Substitutes (Package Variation):

SN74AHCT574DBR (Texas Instruments) and SN74AHC574DBR (Texas Instruments) are functionally equivalent but use the 20-SSOP package (0.209", 5.30mm width) instead of 20-TSSOP. These require PCB layout modification but maintain electrical compatibility. SN74AHCT574DGVR uses the 20-TFSOP package, which is mechanically compatible with 20-TSSOP footprints.

Alternative Substitute (Lower Performance):

CD74HCT574PWR (Texas Instruments) operates at 60 MHz clock frequency with 33 ns maximum propagation delay, representing reduced performance compared to the original 130 MHz specification. This part is suitable only for applications where lower clock speeds are acceptable. It features 6 mA output current (versus 8 mA) and 8 µA quiescent current (versus 4 µA), resulting in higher power consumption.

Voltage-Flexible Alternatives:

74AHC574PW,118 (Nexperia) and SN74AHC574PWR (Texas Instruments) support extended supply voltage range (2V ~ 5.5V), providing flexibility for mixed-voltage systems. These parts maintain 115 MHz clock frequency and 10.6 ns propagation delay but are limited to -40°C ~ 85°C operating temperature range.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74VHCT574AMTC with 74AHCT574PW,118 without PCB modifications?

A: Yes. Both parts use the identical 20-TSSOP package (0.173", 4.40mm width) and footprint. The electrical specifications are compatible within the 4.5V ~ 5.5V supply range. No PCB layout changes are required.

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

A: The 74AHCT series maintains the 4.5V ~ 5.5V supply voltage range of the original 74VHCT574AMTC. The 74AHC series supports extended voltage operation (2V ~ 5.5V) but is otherwise functionally identical. For designs operating strictly at 5V, both are interchangeable.

Q: Why does CD74HCT574PWR show 60 MHz clock frequency instead of 130 MHz?

A: CD74HCT574PWR is from the 74HCT series, which uses different internal architecture resulting in lower clock frequency and longer propagation delay (33 ns versus 10.4 ns). This part is suitable only for applications where timing margins permit reduced performance.

Q: Can I use SN74AHCT574DBR if my PCB is designed for 20-TSSOP?

A: SN74AHCT574DBR uses 20-SSOP package (0.209", 5.30mm width), which has different pin spacing than 20-TSSOP (0.173", 4.40mm width). Direct substitution requires PCB redesign. Verify footprint compatibility before use.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the environmental and regulatory status of the original 74VHCT574AMTC.

Q: What is the maximum operating temperature for substitute parts?

A: 74AHCT series substitutes (74AHCT574PW,118, SN74AHCT574DBR, SN74AHCT574DGVR, SN74AHCT574PWR) operate to 125°C. 74AHC series substitutes (74AHC574PW,118, SN74AHC574DBR, SN74AHC574PWR) operate to 85°C, matching the original part. CD74HCT574PWR operates to 125°C.

Q: Which substitute has the lowest quiescent current?

A: All 74AHC and 74AHCT series substitutes feature 4 µA quiescent current, identical to the original part. CD74HCT574PWR has 8 µA quiescent current, resulting in higher standby power consumption.

Q: Can I use these substitutes in high-speed applications requiring 130 MHz operation?

A: Substitute parts operate at maximum 115 MHz clock frequency, which is lower than the original 130 MHz specification. For applications requiring 130 MHz operation, timing analysis must confirm that 115 MHz performance is acceptable for the specific circuit design.

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