74VHC574M Equivalent & Substitute Parts

Part Overview

The 74VHC574M is an 8-bit D-type flip-flop logic integrated circuit manufactured by onsemi in a 20-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74VHC574M operates across a wide supply voltage range of 2V to 5.5V with a maximum propagation delay of 10.6ns at 5V with 50pF load, making it suitable for general-purpose digital logic applications requiring edge-triggered data storage.

Key Parameters

Parameter	Value
Function	D-Type Flip Flop, 1 Element, 8 Bit
Output Type	Tri-State, Non-Inverted
Trigger Type	Positive Edge
Clock Frequency	115 MHz
Max Propagation Delay @ 5V, 50pF	10.6ns
Output Current (High/Low)	8mA / 8mA
Supply Voltage Range	2V ~ 5.5V
Quiescent Current	4 µA
Input Capacitance	4 pF
Operating Temperature	-40°C ~ 85°C
Package	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 74VHC574M are grouped based on strict electrical and mechanical compatibility criteria. All substitutes maintain the core functional specifications: D-type flip-flop architecture, 8-bit configuration, positive edge triggering, tri-state non-inverted output, 115 MHz clock frequency, and 10.6ns maximum propagation delay at 5V with 50pF load. All substitutes are housed in 20-SOIC surface mount packages compatible with the original part's PCB footprint.

Substitution eligibility is determined by the following parameters:

Functional equivalence: D-type flip-flop, 1 element, 8-bit configuration
Output characteristics: Tri-state, non-inverted logic
Electrical performance: 115 MHz clock frequency, 10.6ns propagation delay
Supply voltage compatibility: Minimum 2V to 5.5V range or subset thereof
Output drive capability: 8mA minimum for both high and low states
Package compatibility: 20-SOIC surface mount form factor
Compliance: ROHS3 certification

Parameter Comparison

Parameter	74VHC574M (onsemi)	MC74VHC574DWG (onsemi)	SN74AHC574DW (TI)	SN74AHC574DWR (TI)	74AHC574D,118 (Nexperia)	74AHCT574D,118 (NXP)	SN74AHC574NSR (TI)	SN74AHCT574DW (TI)	SN74AHCT574NSR (TI)
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Nexperia USA Inc.	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Series	74VHC	74VHC	74AHC	74AHC	74AHC	74AHCT	74AHC	74AHCT	74AHCT
Function	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit	D-Type FF, 1 Element, 8 Bit
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
Trigger Type	Positive Edge	Positive Edge	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	115 MHz	115 MHz
Max Propagation Delay @ 5V, 50pF	10.6ns	10.6ns	10.6ns	10.6ns	10.6ns	10.6ns	10.6ns	10.6ns	10.6ns
Output Current (High/Low)	8mA / 8mA	8mA / 8mA	8mA / 8mA	8mA / 8mA	8mA / 8mA	8mA / 8mA	8mA / 8mA	8mA / 8mA	8mA / 8mA
Supply Voltage Range	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Quiescent Current	4 µA	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	3 pF	3 pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°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)	20-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active	Active	Active	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For direct replacement of the obsolete 74VHC574M, the MC74VHC574DWG from onsemi is the primary parametric equivalent. This part maintains identical electrical specifications and operates across the same 2V to 5.5V supply range. The MC74VHC574DWG is currently in active production status, ensuring long-term availability and supply chain stability. The only difference is the moisture sensitivity level (MSL 3 versus MSL 1), which requires appropriate handling during storage and assembly.

For applications requiring active product status with extended availability, the SN74AHC574DWR from Texas Instruments provides full electrical equivalence with identical performance characteristics. This part is actively produced and available in cut tape and reel packaging. The 74AHC574D,118 from Nexperia USA Inc. offers an upgrade path with extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), maintaining all core electrical specifications while providing enhanced thermal performance for demanding applications.

For designs operating exclusively at 5V supply levels, the 74AHCT574D,118 from NXP USA Inc. and SN74AHCT574NSR from Texas Instruments are compatible alternatives. These parts restrict supply voltage to 4.5V to 5.5V but maintain all other electrical and functional specifications. Both are in active production.

Parts with narrower package widths (SN74AHC574NSR and SN74AHCT574NSR at 0.209" versus 0.295") require PCB layout verification to confirm footprint compatibility before selection.

Frequently Asked Questions (FAQ)

Q: Can the MC74VHC574DWG directly replace the 74VHC574M without circuit modifications?

A: Yes. The MC74VHC574DWG is a parametric equivalent with identical electrical specifications, output drive capability, propagation delay, and supply voltage range. The only difference is moisture sensitivity level (MSL 3 versus MSL 1), which affects storage and handling procedures but not circuit operation.

Q: What is the difference between 74VHC, 74AHC, and 74AHCT series parts?

A: The 74VHC574M operates across 2V to 5.5V supply range. The 74AHC series (SN74AHC574DW, SN74AHC574DWR, 74AHC574D,118, SN74AHC574NSR) also operates across 2V to 5.5V. The 74AHCT series (74AHCT574D,118, SN74AHCT574DW, SN74AHCT574NSR) restricts operation to 4.5V to 5.5V. All three series maintain identical clock frequency, propagation delay, and output drive specifications.

Q: Are there package compatibility concerns between substitute parts?

A: Most substitutes use the standard 20-SOIC package at 0.295" width (7.50mm), which is directly compatible with the original 74VHC574M footprint. However, SN74AHC574NSR and SN74AHCT574NSR use a narrower 20-SOIC package at 0.209" width (5.30mm). Verify PCB layout and footprint definitions before selecting these narrower variants.

Q: Which substitute part offers the best long-term availability?

A: The SN74AHC574DWR from Texas Instruments and 74AHC574D,118 from Nexperia USA Inc. are both in active production status. The MC74VHC574DWG from onsemi is also active but carries MSL 3 moisture sensitivity. All three are suitable for new designs requiring long-term supply assurance.

Q: Can I use 74AHCT574 parts in designs originally specified for 74VHC574M?

A: Only if your circuit operates exclusively at 4.5V to 5.5V supply voltage. The 74AHCT574 series restricts minimum supply voltage to 4.5V, whereas the 74VHC574M and 74AHC574 series support operation down to 2V. If your design requires operation below 4.5V, use 74VHC or 74AHC series substitutes instead.

Q: What is the significance of input capacitance differences (4 pF versus 3 pF)?

A: The 74VHC574M and MC74VHC574DWG specify 4 pF input capacitance, while 74AHC and 74AHCT series specify 3 pF. This minor difference does not affect functional compatibility or circuit operation in standard applications. Both values are within acceptable ranges for digital logic design.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant except 74AHCT574D,118 and SN74AHCT574DW, for which RoHS status is not specified in the provided data. Verify RoHS compliance with the manufacturer if this certification is required for your application.

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