SN74HCS573RKSR Equivalent & Substitute Parts

Part Overview

The SN74HCS573RKSR is an active D-Type Transparent Latch logic integrated circuit manufactured by Texas Instruments. This component functions as a single-channel 8:8 latch with tri-state output capability, designed for digital logic applications requiring transparent latch functionality. The device is housed in a 20-VQFN surface mount package with exposed pad and operates across a 2V to 6V supply voltage range.

Substitute parts are identified when components share identical electrical specifications, mechanical compatibility, and functional characteristics. Alternative models become necessary when the primary part number experiences extended lead times, inventory constraints, or supply chain disruptions while maintaining full design compatibility.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Independent Circuits	1
Propagation Delay Time	11ns
Output Current (High/Low)	7.8mA / 7.8mA
Operating Temperature Range	-40°C ~ 125°C (TA)
Package Type	20-VQFN (2.5x4.5) Exposed Pad
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HCS573RKSR is determined by strict parametric matching across all critical electrical and mechanical specifications. The following parameters establish the substitution criteria:

Electrical Specifications:

Logic type classification (D-Type Transparent Latch)
Circuit configuration (8:8)
Output type (Tri-State)
Supply voltage range (2V ~ 6V)
Propagation delay time (11ns)
Output current ratings (7.8mA high and low)
Operating temperature range (-40°C ~ 125°C)

Mechanical Specifications:

Package type (20-VQFN with exposed pad)
Physical dimensions (2.5x4.5mm)
Mounting technology (Surface Mount)
Moisture sensitivity classification (MSL 1)

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. No functional or performance degradation occurs when substituting between qualified parts within this grouping.

Parameter Comparison

Parameter	SN74HCS573RKSR	SN74HCS373RKSR
Manufacturer	Texas Instruments	Texas Instruments
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8
Output Type	Tri-State	Tri-State
Voltage Supply Range	2V ~ 6V	2V ~ 6V
Independent Circuits	1	1
Propagation Delay Time	11ns	11ns
Output Current High	7.8mA	7.8mA
Output Current Low	7.8mA	7.8mA
Operating Temperature Range	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)
Package Type	20-VQFN (2.5x4.5) Exposed Pad	20-VQFN (2.5x4.5) Exposed Pad
Mounting Type	Surface Mount	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active
ECCN Classification	EAR99	EAR99
HTSUS Code	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

Both the SN74HCS573RKSR and SN74HCS373RKSR are classified as active products by Texas Instruments, indicating ongoing manufacturing support and availability. Both components carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, establishing equivalent regulatory and compliance status.

Selection between these parts is based on inventory availability and supply chain considerations. The SN74HCS573RKSR maintains 3,587 pieces in stock, while the SN74HCS373RKSR maintains 2,112 pieces in stock. Both parts satisfy identical design requirements and deliver equivalent performance characteristics across all specified electrical and mechanical parameters.

No performance trade-offs, derating, or design modifications are required when substituting between these components. Direct pin-for-pin and functional compatibility is established through parametric equivalence.

Frequently Asked Questions (FAQ)

Q: Can the SN74HCS373RKSR be used as a direct replacement for the SN74HCS573RKSR?

A: Yes. Both components are parametric equivalents with identical electrical specifications, output characteristics, operating temperature ranges, and package configurations. Direct substitution is supported without design modifications.

Q: Are there any differences in propagation delay between these parts?

A: No. Both the SN74HCS573RKSR and SN74HCS373RKSR specify 11ns propagation delay time. Timing performance is identical.

Q: Do these parts require different PCB layouts or mounting procedures?

A: No. Both components use the 20-VQFN (2.5x4.5mm) surface mount package with exposed pad. PCB footprints, reflow profiles, and assembly procedures are identical.

Q: What is the moisture sensitivity classification for these parts?

A: Both parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply.

Q: Are supply voltage requirements identical?

A: Yes. Both parts operate across the 2V to 6V supply voltage range with identical electrical performance across this range.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. No schematic changes, PCB modifications, or firmware updates are required when substituting between these components.

Q: What output current capability do these parts provide?

A: Both parts deliver 7.8mA output current in both high and low states, providing identical drive capability for connected logic circuits.

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