74HCT574DB,112 Equivalent & Substitute Parts

Part Overview

The 74HCT574DB,112 is a D-Type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., configured as a single 8-bit element with tri-state, non-inverted outputs. This device operates as a standard positive-edge-triggered flip-flop in the 74HCT logic family, housed in a 20-SSOP (0.209", 5.30mm Width) surface mount package.

The 74HCT574DB,112 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain functional equivalence across electrical performance, logic family compatibility, and mechanical packaging constraints.

Substiute Parts

74HCT574DB,112

Nexperia USA Inc.In Stock: 115374HCT574DB,112 Datasheet

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74HCT574PW,118

Nexperia USA Inc.In Stock: 3391274HCT574PW,118 Datasheet

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CD74HCT574PWR

Texas InstrumentsIn Stock: 2246CD74HCT574PWR Datasheet

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CD74HCT574QPWREP

Texas InstrumentsIn Stock: 1067CD74HCT574QPWREP Datasheet

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MM74HCT574MTC

onsemiIn Stock: 3264MM74HCT574MTC Datasheet

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MM74HCT574MTCX

onsemiIn Stock: 2330MM74HCT574MTCX Datasheet

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SN74HCT574DBR

Texas InstrumentsIn Stock: 3369SN74HCT574DBR Datasheet

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SN74HCT574PW

Texas InstrumentsIn Stock: 1722SN74HCT574PW Datasheet

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SN74HCT574PWR

Texas InstrumentsIn Stock: 2125SN74HCT574PWR Datasheet

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SN74HCT574PWT

Texas InstrumentsIn Stock: 1215SN74HCT574PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HCT574DB,112 are grouped based on the following substitution criteria:

Primary Substitution Parameters:

• Logic family (74HCT)
• Function (D-Type flip-flop, 1 element, 8-bit)
• Output type (Tri-state, non-inverted)
• Trigger type (Positive edge)
• Voltage supply range (4.5V ~ 5.5V)
• RoHS and compliance status

Package Compatibility Groups:

1. Same Package (20-SSOP): Parts maintaining identical 20-SSOP (0.209", 5.30mm Width) packaging for direct board-level substitution without layout modification.

2. Alternative Package (20-TSSOP): Parts using 20-TSSOP (0.173", 4.40mm Width) packaging, which is mechanically compatible but requires PCB footprint adjustment. This package is narrower and represents a space-optimized alternative.

Substitute parts are sourced from multiple manufacturers including Texas Instruments, onsemi, and Nexperia USA Inc., all maintaining the 74HCT logic family standard and core electrical specifications. Variations in clock frequency, propagation delay, output current, and operating temperature range are noted but do not preclude substitution when application requirements fall within the substitute part's specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Replacement (20-SSOP):

SN74HCT574DBR (Texas Instruments) is the primary substitute for the 74HCT574DB,112. Both parts use identical 20-SSOP packaging, enabling direct board-level substitution without PCB layout modification. SN74HCT574DBR maintains active product status and full RoHS3 compliance. The part operates within the required 4.5V ~ 5.5V supply range and meets the tri-state, non-inverted output specification. Operating temperature range is -40°C ~ 85°C, which is narrower than the original part but covers standard industrial applications.

For Space-Optimized Substitution (20-TSSOP):

74HCT574PW,118 (Nexperia USA Inc.) provides the closest electrical match with active product status. This part maintains the same clock frequency (76 MHz) and propagation delay (33 ns @ 4.5V, 50pF) as the original 74HCT574DB,112, with identical output current specifications. The 20-TSSOP package is narrower (0.173" vs. 0.209") and requires PCB footprint redesign. Operating temperature range extends to -40°C ~ 125°C, matching the original specification.

CD74HCT574PWR (Texas Instruments) offers extended operating temperature range (-55°C ~ 125°C) for applications requiring enhanced low-temperature performance. This part is active and RoHS3 compliant. Clock frequency is reduced to 60 MHz, and propagation delay remains 33 ns @ 4.5V, 50pF.

For High-Current Output Applications:

MM74HCT574MTC and MM74HCT574MTCX (onsemi) provide increased output current capability (7.2 mA vs. 6 mA) and faster propagation delay (30 ns @ 5V, 50pF). Both parts are active and RoHS3 compliant. Operating temperature range is -40°C ~ 85°C. These parts are suitable for applications requiring higher drive capability.

All recommended substitutes maintain RoHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory and environmental compliance equivalence with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package part as a direct replacement for the 20-SSOP 74HCT574DB,112?

A: No, not without PCB modification. The 20-TSSOP package (0.173" width) and 20-SSOP package (0.209" width) have different footprints. While electrically compatible, the narrower TSSOP package requires PCB layout redesign. For direct board-level substitution without layout changes, use SN74HCT574DBR, which maintains the 20-SSOP package.

Q: What is the difference between the Nexperia 74HCT574PW,118 and Texas Instruments SN74HCT574PWR?

A: Both are 20-TSSOP packages with tri-state, non-inverted outputs and positive-edge triggering. The Nexperia part maintains 76 MHz clock frequency and 33 ns propagation delay. The Texas Instruments part operates at 60 MHz with the same 33 ns propagation delay. The Nexperia part supports -40°C ~ 125°C operation, while the Texas Instruments part supports -55°C ~ 125°C. Selection depends on clock frequency requirements and low-temperature performance needs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the regulatory compliance of the original 74HCT574DB,112.

Q: What does "Discontinued at DiGi Electronics" mean for SN74HCT574PW and SN74HCT574PWT?

A: These parts are no longer actively distributed through DiGi Electronics but may remain available through other authorized distributors or secondary market sources. For new designs, prioritize parts with "Active" product status such as SN74HCT574PWR, 74HCT574PW,118, or CD74HCT574PWR.

Q: Can I substitute the onsemi MM74HCT574MTC for the original 74HCT574DB,112?

A: Yes, with considerations. The MM74HCT574MTC uses a 20-TSSOP package (requiring PCB modification) and operates at -40°C ~ 85°C (narrower than the original -40°C ~ 125°C range). However, it provides superior propagation delay (30 ns @ 5V, 50pF) and higher output current (7.2 mA). This part is suitable if your application operates within the -40°C ~ 85°C temperature range and benefits from improved performance characteristics.

Q: What is the significance of input capacitance differences between parts?

A: Input capacitance affects circuit loading and timing characteristics. The original 74HCT574DB,112 specifies 4.6 pF input capacitance. Substitute parts from Texas Instruments and onsemi specify 3 pF or 10 pF. These variations are within normal manufacturing tolerances for the 74HCT logic family and do not preclude substitution. Verify that your circuit design accommodates the specified input capacitance of the selected substitute part.

Q: Which substitute part has the best availability?

A: According to current inventory data, 74HCT574PW,118 (Nexperia) has the highest stock level at 33,864 pieces. SN74HCT574DBR (Texas Instruments) has 3,300 pieces available. For immediate availability, consult current distributor inventory, as stock levels change continuously.