74HCT573N Equivalent & Substitute Parts

Part Overview

The 74HCT573N is a D-Type Transparent Latch logic IC manufactured by NXP USA Inc., featuring an 8:8 circuit configuration with tri-state output in a 20-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The part operates within a 4.5V to 5.5V supply voltage range and is suitable for through-hole mounting applications requiring transparent latch functionality.

Substiute Parts

74HCT573N,652

NXP USA Inc.In Stock: 102374HCT573N,652 Datasheet

Current PartRFQ

CD74HCT573E

Harris CorporationIn Stock: 3066CD74HCT573E Datasheet

DirectRFQ

SN74HCT573N

Texas InstrumentsIn Stock: 2486SN74HCT573N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT573N is determined by the following critical parameters: logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage range (4.5V ~ 5.5V), output current capability (6mA minimum for both high and low states), and physical package compatibility (20-DIP form factor with 0.300" pitch).

Acceptable substitutes must maintain identical or superior specifications in these core parameters. Variations in propagation delay time, operating temperature range, and product status are permitted provided the substitute meets or exceeds the functional requirements of the original design. All substitute parts listed below share the same base product number (74HCT573) and are manufactured to the same logic family standard.

Parameter Comparison

Engineering Selection Recommendations

The SN74HCT573N manufactured by Texas Instruments is the primary recommended substitute. This part maintains active product status, ensuring long-term availability and manufacturing support. It meets ROHS3 compliance requirements and delivers propagation delay performance (25ns) between the original NXP part (17ns) and the Harris alternative (35ns). The operating temperature range of -40°C to 85°C covers standard industrial applications, though it does not extend to the upper limit of the original specification.

The CD74HCT573E from Harris Corporation provides an alternative with extended upper operating temperature capability (-55°C to 125°C), matching the original part's temperature envelope. However, this substitute carries obsolete product status and does not meet RoHS3 compliance standards. Selection of this part should be limited to legacy system maintenance where temperature performance is critical and compliance requirements are not applicable.

Both substitutes maintain electrical and mechanical compatibility with the original 74HCT573N through identical supply voltage ranges, output current specifications, and 20-DIP package geometry.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCT573N directly replace the 74HCT573N in existing designs?

A: Yes. The SN74HCT573N maintains identical logic type, circuit configuration, output type, supply voltage range, output current capability, and physical package dimensions. Propagation delay differences (25ns versus 17ns) are within acceptable margins for most applications using transparent latch functionality.

Q: What is the primary difference between the CD74HCT573E and SN74HCT573N substitutes?

A: The CD74HCT573E provides extended lower operating temperature capability (-55°C minimum versus -40°C) and reaches the full upper temperature limit of 125°C. The SN74HCT573N offers active product status and RoHS3 compliance. Propagation delay performance differs: CD74HCT573E at 35ns versus SN74HCT573N at 25ns.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitutes use the 20-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical compatibility with existing PCB layouts and socket configurations.

Q: Does RoHS compliance affect functional compatibility?

A: No. RoHS compliance status indicates manufacturing process and material composition standards but does not alter electrical performance or functional behavior. Both RoHS3-compliant and non-compliant parts perform identically in circuit operation.

Q: Which substitute should be selected for new designs?

A: The SN74HCT573N is the appropriate choice for new designs due to active product status, ensuring continued availability and manufacturing consistency. This part meets modern compliance requirements and delivers adequate performance for standard transparent latch applications.