SN74HCT574DW Equivalent & Substitute Parts

Part Overview

The SN74HCT574DW is a D-Type flip-flop logic integrated circuit manufactured by Texas Instruments, featuring 1 element with 8-bit positive edge triggering in a 20-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates within the 4.5V to 5.5V supply voltage range with a maximum clock frequency of 40 MHz and propagation delay of 47ns at 5.5V with 150pF load.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN74HCT574DW
Series	74HCT
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	40 MHz
Max Propagation Delay @ V, Max CL	47ns @ 5.5V, 150pF
Voltage Supply Range	4.5V ~ 5.5V
Current - Output High, Low	6mA, 6mA
Current - Quiescent (Iq)	8 µA
Input Capacitance	3 pF
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the SN74HCT574DW is determined by strict equivalence across the following critical parameters:

Functional Type: D-Type flip-flop with 1 element, 8-bit configuration
Output Configuration: Tri-State, Non-Inverted
Trigger Type: Positive Edge
Package: 20-SOIC (0.295", 7.50mm Width) surface mount
Voltage Supply: 4.5V ~ 5.5V
Output Drive Capability: 6mA minimum for both high and low states
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent: Parts from the same manufacturer (Texas Instruments) with identical electrical specifications and packaging, differing only in tape and reel packaging format.

Manufacturer Recommended Equivalents: Parts from alternative manufacturers (Nexperia, onsemi) that meet or exceed the electrical specifications of the original part while maintaining functional and package compatibility.

Parametric Equivalents: Parts with the same base function but different internal architecture (such as the SN74HCT374DW, which is a latch rather than a flip-flop) that may serve similar applications with design consideration.

Parameter Comparison

Part Number	Manufacturer	Clock Frequency	Max Propagation Delay	Output Current (High/Low)	Quiescent Current	Operating Temperature	Package	Product Status	MSL
SN74HCT574DW	Texas Instruments	40 MHz	47ns @ 5.5V, 150pF	6mA, 6mA	8 µA	-40°C ~ 85°C	20-SOIC	Discontinued	1
SN74HCT574DWR	Texas Instruments	40 MHz	47ns @ 5.5V, 150pF	6mA, 6mA	8 µA	-40°C ~ 85°C	20-SOIC	Active	1
74HCT574D,653	Nexperia USA Inc.	76 MHz	33ns @ 4.5V, 50pF	6mA, 6mA	8 µA	-40°C ~ 125°C	20-SOIC	Active	1
74HCT574D-Q100,118	Nexperia USA Inc.	76 MHz	33ns @ 4.5V, 50pF	6mA, 6mA	8 µA	-40°C ~ 125°C	20-SOIC	Active	1
MC74HCT574ADWR2G	onsemi	30 MHz	30ns @ 5V, 50pF	6mA, 6mA	4 µA	-55°C ~ 125°C	20-SOIC	Active	3
MM74HCT574WM	onsemi	33 MHz	30ns @ 5V, 50pF	7.2mA, 7.2mA	8 µA	-40°C ~ 85°C	20-SOIC	Active	3
MM74HCT574WMX	onsemi	33 MHz	30ns @ 5V, 50pF	7.2mA, 7.2mA	8 µA	-40°C ~ 85°C	20-SOIC	Active	3
NLV74HCT574ADWRG	onsemi	30 MHz	30ns @ 5V, 50pF	6mA, 6mA	4 µA	-55°C ~ 125°C	20-SOIC	Obsolete	3
SN74HCT374DW	Texas Instruments	40 MHz	25ns @ 5.5V, 50pF	6mA, 6mA	8 µA	-40°C ~ 85°C	20-SOIC	Discontinued	1

Engineering Selection Recommendations

Primary Recommendation: SN74HCT574DWR (Texas Instruments)

The SN74HCT574DWR is the direct equivalent to the SN74HCT574DW, offering identical electrical specifications and operating characteristics. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube). This part maintains active product status and is the preferred choice for direct replacement in production environments.

Secondary Recommendation: 74HCT574D,653 or 74HCT574D-Q100,118 (Nexperia USA Inc.)

Both Nexperia parts exceed the performance specifications of the original SN74HCT574DW with higher clock frequency (76 MHz versus 40 MHz) and faster propagation delay (33ns versus 47ns). The 74HCT574D-Q100,118 variant includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components. Both maintain active product status and ROHS3 compliance.

Tertiary Recommendation: MC74HCT574ADWR2G or MM74HCT574WMX (onsemi)

onsemi parts provide functional equivalence with extended operating temperature ranges (-55°C to 125°C for MC74HCT574ADWR2G). The MC74HCT574ADWR2G offers lower quiescent current (4 µA versus 8 µA), beneficial for low-power applications. Both parts are active and ROHS3 compliant. Note that onsemi parts carry MSL rating of 3 (168 Hours), requiring moisture control during storage and handling.

Not Recommended: NLV74HCT574ADWRG (onsemi)

This part is marked as Obsolete and should not be selected for new designs or production continuity planning.

Not Recommended for Direct Substitution: SN74HCT374DW (Texas Instruments)

While functionally similar, the SN74HCT374DW is a latch (not a flip-flop) and has different internal architecture. This part is a parametric equivalent only and requires circuit design review before substitution.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HCT574DWR as a direct replacement for SN74HCT574DW?

A: Yes. The SN74HCT574DWR is electrically and functionally identical to the SN74HCT574DW. The only difference is the packaging format: SN74HCT574DWR is supplied in Cut Tape & Digi-Reel format, while SN74HCT574DW is supplied in Tube format. Both are 20-SOIC surface mount packages with identical pinouts and electrical characteristics.

Q: What is the difference between the 74HCT574 and 74HCT374?

A: The 74HCT574 is a D-Type flip-flop, while the 74HCT374 is a D-Type latch. These are different functional devices with different internal architectures. The 74HCT374 captures data on the rising edge of the clock and holds it while the clock is high, whereas the 74HCT574 captures data on the rising edge and holds it until the next rising edge. Direct substitution is not possible without circuit redesign.

Q: Are Nexperia 74HCT574D parts compatible with the original SN74HCT574DW?

A: Yes. Nexperia 74HCT574D,653 and 74HCT574D-Q100,118 are functionally compatible with the SN74HCT574DW. They maintain the same 20-SOIC package, pinout, and voltage supply range (4.5V ~ 5.5V). Both parts exceed the original specifications with higher clock frequency and faster propagation delay, making them suitable drop-in replacements.

Q: What does MSL rating mean, and why do onsemi parts have MSL 3 instead of MSL 1?

A: MSL (Moisture Sensitivity Level) indicates how sensitive a component is to moisture absorption during storage. MSL 1 means unlimited shelf life without moisture control. MSL 3 means the component must be used within 168 hours of opening the moisture barrier bag. onsemi parts with MSL 3 require proper moisture control during storage and handling but are otherwise functionally equivalent.

Q: Can I use MC74HCT574ADWR2G in a battery-powered application?

A: Yes. The MC74HCT574ADWR2G has lower quiescent current (4 µA) compared to the original SN74HCT574DW (8 µA), making it more suitable for low-power and battery-powered applications. It also offers extended operating temperature range (-55°C to 125°C), providing additional design margin for temperature-sensitive applications.

Q: Is the 74HCT574D-Q100,118 suitable for automotive applications?

A: Yes. The 74HCT574D-Q100,118 carries AEC-Q100 automotive qualification, indicating it meets automotive industry reliability and quality standards. This part is suitable for automotive and other mission-critical applications requiring qualified components.

Q: What should I consider when switching from Texas Instruments to Nexperia or onsemi parts?

A: Key considerations include: (1) Propagation delay specifications—Nexperia parts are faster; (2) Operating temperature range—Nexperia and onsemi parts offer extended ranges; (3) Quiescent current—onsemi MC74HCT574ADWR2G is lower; (4) Moisture sensitivity—onsemi parts require MSL 3 handling; (5) Availability and lead times from your supplier. All parts maintain the same 20-SOIC package and pinout, ensuring mechanical compatibility.

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