74HCT574N Equivalent & Substitute Parts

Part Overview

The 74HCT574N is a D-Type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for 8-bit data storage and transfer applications. This component features tri-state, non-inverted outputs and operates across a 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, redesign, and procurement planning. Substitute parts must maintain functional equivalence through matching logic family, package type, and critical electrical parameters.

Substiute Parts

74HCT574N,652

NXP USA Inc.In Stock: 107774HCT574N,652 Datasheet

Current PartRFQ

CD74HCT574E

Texas InstrumentsIn Stock: 1329CD74HCT574E Datasheet

DirectRFQ

SN74HCT574N

Texas InstrumentsIn Stock: 129063SN74HCT574N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HCT574N is determined by strict adherence to the following parameters:

Critical Matching Parameters:

• Logic family designation (74HCT series)
• Functional type (D-Type flip-flop, 1 element, 8-bit configuration)
• Output configuration (tri-state, non-inverted)
• Package type (20-DIP with 0.300" pitch, 7.62mm)
• Mounting method (through-hole)
• Supply voltage range (4.5V ~ 5.5V)
• Trigger mechanism (positive edge)

Allowable Variation Parameters:

• Clock frequency (may vary within logic family specifications)
• Propagation delay (within acceptable timing margins for the application)
• Input capacitance (minor variations acceptable)
• Operating temperature range (may extend beyond original specification)
• Product status (active parts preferred over obsolete)

Two substitute parts meet these criteria: the CD74HCT574E (Texas Instruments, direct manufacturer equivalent) and the SN74HCT574N (Texas Instruments, manufacturer-recommended substitute).

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products from Texas Instruments and maintain full functional and electrical compatibility with the 74HCT574N within the specified parameter ranges.

CD74HCT574E Selection Criteria:

• Preferred for applications requiring extended lower temperature operation (-55°C minimum)
• Suitable for designs with timing margins that accommodate 60 MHz clock frequency
• Maintains identical propagation delay specification (33ns @ 4.5V, 50pF) to the original part
• ROHS3 compliant and REACH unaffected

SN74HCT574N Selection Criteria:

• Manufacturer-recommended substitute with highest inventory availability (129,050 pcs)
• Suitable for applications operating within -40°C to 85°C temperature range
• Acceptable for designs where 40 MHz clock frequency meets system requirements
• Propagation delay specification (47ns @ 5.5V, 150pF) requires timing verification for critical paths
• ROHS3 compliant and REACH unaffected

Both parts satisfy regulatory compliance requirements (ROHS3, REACH unaffected, EAR99 classification, HTSUS 8542.39.0001). Selection between CD74HCT574E and SN74HCT574N depends on specific application temperature range and timing margin requirements.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT574E and SN74HCT574N be used interchangeably with the 74HCT574N?

A: Both parts are functionally equivalent within the 74HCT logic family and share identical package, pinout, and output configuration. Interchangeability is confirmed for applications where the operating temperature range and clock frequency specifications of the selected substitute part encompass the system requirements.

Q: What is the primary difference between the CD74HCT574E and SN74HCT574N?

A: The CD74HCT574E supports extended lower temperature operation (-55°C minimum) and maintains tighter propagation delay specifications (33ns @ 4.5V, 50pF). The SN74HCT574N operates within -40°C to 85°C and has relaxed propagation delay specifications (47ns @ 5.5V, 150pF). Clock frequency ratings differ: CD74HCT574E at 60 MHz versus SN74HCT574N at 40 MHz.

Q: Are there any package or pinout differences between these parts?

A: No. All three parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging with matching pinout and mechanical dimensions.

Q: Do these substitute parts meet current regulatory requirements?

A: Yes. Both CD74HCT574E and SN74HCT574N are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes.

Q: Which substitute part should be selected for new designs?

A: The SN74HCT574N is the manufacturer-recommended substitute with superior inventory availability. The CD74HCT574E is preferred only when extended lower temperature operation (-55°C) is a system requirement.

Q: What timing considerations apply when substituting the SN74HCT574N?

A: The SN74HCT574N has a maximum propagation delay of 47ns at 5.5V with 150pF load, compared to 33ns at 4.5V with 50pF load for the original part. Critical timing paths must be re-evaluated to confirm the relaxed specification remains within system margins.