74VHCT574AM Equivalent & Substitute Parts

Part Overview

The 74VHCT574AM is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and tri-state, non-inverted output configuration. This component operates as a standard logic latch with positive edge triggering and is housed in a 20-SOIC surface mount package. 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	74VHCT574AM
Manufacturer	onsemi
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 (TA)
Package / Case	20-SOIC (0.295", 7.50mm 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 74VHCT574AM are classified based on strict adherence to the following critical parameters:

Core Substitution Criteria:

Type: D-Type Flip Flop
Number of Elements: 1
Number of Bits per Element: 8
Output Type: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 4.5V ~ 5.5V (minimum requirement)
Current - Output High, Low: 8 mA, 8 mA

Parametric Equivalents maintain all core parameters identically to the main part, including clock frequency (130 MHz) and propagation delay (10.4 ns @ 5V, 50pF).

Similar Parts share the same functional configuration and package but may have minor variations in clock frequency (115 MHz vs. 130 MHz), propagation delay (10.6 ns vs. 10.4 ns), input capacitance (3 pF vs. 4 pF), or operating temperature range extensions. These variations remain within acceptable substitution tolerances for standard logic applications.

Parameter Comparison

Parameter	74VHCT574AM (onsemi)	74VHCT574AM (Fairchild)	74AHCT574D,118 (NXP)	SN74AHC574DWR (TI)	SN74AHCT574DW (TI)	SN74AHCT574DWR (TI)	SN74AHCT574NSR (TI)	SN74AHCT374DW (TI)
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
Number of Bits per Element	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
Clock Frequency	130 MHz	130 MHz	115 MHz	115 MHz	115 MHz	115 MHz	115 MHz	130 MHz
Max Propagation Delay @ 5V, 50pF	10.4 ns	10.4 ns	10.6 ns	10.6 ns	10.6 ns	10.6 ns	10.6 ns	10.4 ns
Trigger Type	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	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	4.5V ~ 5.5V	4.5V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	4 µA	4 µA	4 µA	4 µA	4 µA	4 µA	4 µA	4 µA
Input Capacitance	4 pF	4 pF	3 pF	3 pF	3 pF	3 pF	3 pF	4 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)
Product Status	Obsolete	Active	Active	Active	Discontinued at DiGi Electronics	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements):

The 74VHCT574AM from Fairchild Semiconductor and SN74AHCT374DW from Texas Instruments are parametric equivalents, maintaining identical clock frequency (130 MHz) and propagation delay (10.4 ns @ 5V, 50pF) specifications. The Fairchild part carries Active product status, while the Texas Instruments SN74AHCT374DW is designated Last Time Buy. Both are ROHS3 compliant and suitable for direct substitution in applications requiring the original performance envelope.

Similar Parts (Functional Substitutes):

The 74AHCT574D,118 (NXP), SN74AHC574DWR, SN74AHCT574DW, and SN74AHCT574DWR (all Texas Instruments) function as compatible substitutes with minor performance variations. These parts operate at 115 MHz clock frequency and 10.6 ns propagation delay, representing acceptable tolerance margins for standard logic applications. All maintain the required 8 mA output drive capability and tri-state configuration. The SN74AHC574DWR offers extended supply voltage range (2V ~ 5.5V), providing additional design flexibility for lower voltage applications.

Package Consideration:

The SN74AHCT574NSR from Texas Instruments uses a narrower 20-SOIC package (0.209", 5.30mm width) compared to the standard 0.295" (7.50mm) width. This variant requires PCB layout verification before selection to ensure footprint compatibility.

Product Status Guidance:

For new designs, prioritize Active status parts: 74VHCT574AM (Fairchild), 74AHCT574D,118 (NXP), SN74AHC574DWR, and SN74AHCT574DWR (Texas Instruments). The SN74AHCT574DW (Discontinued at DiGi Electronics) and SN74AHCT374DW (Last Time Buy) are suitable for existing production support but not recommended for new development.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AHCT574DWR as a direct replacement for 74VHCT574AM?

A: Yes. The SN74AHCT574DWR maintains all critical functional parameters: D-Type flip-flop, 1 element, 8-bit configuration, tri-state non-inverted output, positive edge trigger, 8 mA output drive, 4.5V ~ 5.5V supply, and 20-SOIC package. The 115 MHz clock frequency and 10.6 ns propagation delay represent minor performance variations acceptable for standard logic applications.

Q: What is the difference between 74VHCT574AM and SN74AHCT374DW?

A: Both are parametric equivalents with identical clock frequency (130 MHz) and propagation delay (10.4 ns @ 5V, 50pF). The primary difference is product status: 74VHCT574AM is Obsolete, while SN74AHCT374DW is Last Time Buy. Both are suitable for substitution in applications requiring the original performance specifications.

Q: Why does SN74AHC574DWR have a different supply voltage range?

A: The SN74AHC574DWR operates at 2V ~ 5.5V supply voltage, compared to the standard 4.5V ~ 5.5V range of the 74VHCT574AM. This extended lower voltage capability is a design feature of the AHC logic family. For applications requiring 4.5V ~ 5.5V operation, this part remains fully compatible.

Q: Is the SN74AHCT574NSR package compatible with 74VHCT574AM PCB layouts?

A: The SN74AHCT574NSR uses a narrower 20-SOIC package (0.209", 5.30mm width) versus the standard 0.295" (7.50mm) width of 74VHCT574AM. PCB footprint verification is required before selection. Standard 20-SOIC footprints may not accommodate this narrower variant.

Q: Which substitute part has the best product availability status?

A: The 74AHCT574D,118 (NXP), SN74AHC574DWR, and SN74AHCT574DWR (Texas Instruments) all carry Active product status, indicating current production and ongoing availability. These are the preferred selections for new designs and ongoing production support.

Q: Are all substitute parts ROHS3 compliant?

A: The 74VHCT574AM (onsemi), SN74AHC574DWR, SN74AHCT574DW, SN74AHCT574DWR, and SN74AHCT374DW are confirmed ROHS3 compliant. The 74VHCT574AM (Fairchild), 74AHCT574D,118 (NXP), and SN74AHCT574NSR do not specify RoHS status in the provided data.

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