74LCX573MTC Equivalent & Substitute Parts

Part Overview

The 74LCX573MTC is a D-Type Transparent Latch IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The 20-TSSOP package and 2V to 3.6V supply voltage range define its operational parameters. Equivalent parts must maintain functional compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 3.6V
Propagation Delay	1.5ns
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-TSSOP
Independent Circuits	1

Substitute Part Grouping Explanation

Substitution of the 74LCX573MTC is determined by the following critical parameters: logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage compatibility, propagation delay, output current capability, and package form factor. Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Substitutes maintain identical electrical specifications and package type, differing only in product status (active vs. obsolete) or packaging format (tape & reel vs. tube). These parts are pin-compatible and functionally equivalent.

Upgrade Substitutes are active production parts from the same manufacturer with extended operating temperature ranges (-55°C to 125°C vs. -40°C to 85°C) and improved compliance status (RoHS3 compliant), while maintaining all other electrical parameters.

Parametric Equivalents share the same base product number series (74LCX373) or alternative series (74LVC) with identical functional specifications but may differ in propagation delay, supply voltage range, or operating temperature. These require verification of circuit-level compatibility.

Similar Parts from alternative manufacturers meet the core functional requirements (D-Type Transparent Latch, 8:8 configuration, tri-state output, 20-TSSOP package) but may have variations in propagation delay, supply voltage range, or temperature rating that require application-level assessment.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Propagation Delay	Operating Temp	Package	RoHS Status	Substitution Type
74LCX573MTC	onsemi	Obsolete	2V ~ 3.6V	1.5ns	-40°C ~ 85°C	20-TSSOP	REACH Unaffected	Main Part
MC74LCX573DTR2G	onsemi	Active	2V ~ 3.6V	1.5ns	-55°C ~ 125°C	20-TSSOP	ROHS3 Compliant	Direct Substitute
MC74LCX573DTG	onsemi	Active	2V ~ 3.6V	1.5ns	-55°C ~ 125°C	20-TSSOP	ROHS3 Compliant	Upgrade Substitute
74LCX373MTC	Fairchild Semiconductor	Active	2V ~ 3.6V	1.5ns	-40°C ~ 85°C	20-TSSOP	Not Specified	Parametric Equivalent
MC74LCX373DTG	onsemi	Active	2V ~ 3.6V	1.5ns	-40°C ~ 85°C	20-TSSOP	ROHS3 Compliant	Parametric Equivalent
74LVC573AT20-13	Diodes Incorporated	Active	1.65V ~ 3.6V	4.4ns	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant	Similar Part
74LVC573APW,118	Nexperia USA Inc.	Active	1.2V ~ 3.6V	1.5ns	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant	Similar Part
CLVC573AQPWRG4Q1	Texas Instruments	Active	2V ~ 3.6V	1ns	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant	Similar Part
SN74LVC573ADBR	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-SSOP	ROHS3 Compliant	Similar Part
SN74LVC573ADGVR	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TVSOP	ROHS3 Compliant	Similar Part
SN74LVC573APW	Texas Instruments	Active	1.65V ~ 3.6V	2ns	-40°C ~ 85°C	20-TSSOP	ROHS3 Compliant	Similar Part

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility): MC74LCX573DTR2G and MC74LCX573DTG are the primary substitutes. Both are active production parts from onsemi with identical electrical specifications to the 74LCX573MTC. MC74LCX573DTG offers extended operating temperature range (-55°C to 125°C) and RoHS3 compliance, making it the preferred upgrade path for new designs. Both maintain the 20-TSSOP package and 1.5ns propagation delay.

For Parametric Equivalents: 74LCX373MTC (Fairchild) and MC74LCX373DTG (onsemi) are functionally equivalent with identical electrical parameters but use the 74LCX373 base product number. These are suitable where the specific latch variant (373 vs. 573) is acceptable within the application circuit.

For Extended Temperature or Lower Voltage Operation: 74LVC573APW,118 (Nexperia) supports lower supply voltage (1.2V minimum) and extended temperature range (-40°C to 125°C) while maintaining 1.5ns propagation delay and 20-TSSOP package. CLVC573AQPWRG4Q1 (Texas Instruments) offers automotive-grade qualification (AEC-Q100) with 1ns propagation delay for performance-critical applications.

For Alternative Packages: SN74LVC573ADBR uses 20-SSOP package (5.30mm width vs. 4.40mm), and SN74LVC573ADGVR uses 20-TVSOP package. These are suitable only if PCB layout accommodates the different package dimensions.

All recommended substitutes maintain tri-state output capability, 8:8 circuit configuration, and 24mA output current specifications. Product status verification confirms all alternatives are in active production with current RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX573DTG directly replace 74LCX573MTC without circuit modification?

A: Yes. MC74LCX573DTG is a direct functional replacement with identical pin configuration, electrical specifications, and 20-TSSOP package. The extended operating temperature range (-55°C to 125°C vs. -40°C to 85°C) and RoHS3 compliance represent improvements over the obsolete part. No circuit modifications are required.

Q: What is the difference between 74LCX573 and 74LCX373 base product numbers?

A: Both are D-Type Transparent Latch ICs with 8:8 configuration and tri-state output. The primary distinction is in the internal latch architecture. Parametric equivalents (74LCX373MTC and MC74LCX373DTG) are suitable substitutes only if the application circuit does not depend on specific 573-series functional characteristics. Verify datasheet compatibility before substitution.

Q: Why does 74LVC573APW,118 have a lower minimum supply voltage (1.2V vs. 2V)?

A: The 74LVC series uses a different logic family technology (LVC vs. LCX) that operates across a wider voltage range. While 74LVC573APW,118 maintains identical propagation delay (1.5ns) and output current specifications, the lower voltage threshold may affect circuit behavior in applications with marginal supply voltage margins. Verify supply voltage stability in the target application.

Q: Is the 20-SSOP package (SN74LVC573ADBR) compatible with 20-TSSOP PCB layouts?

A: No. The 20-SSOP package has a 5.30mm width compared to 4.40mm for 20-TSSOP. Pin pitch and footprint differ, requiring PCB layout redesign. Use only if PCB redesign is acceptable or if the application already uses 20-SSOP footprints.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitutes listed are RoHS3 compliant, ensuring compatibility with modern manufacturing and environmental standards.

Q: Can CLVC573AQPWRG4Q1 be used in non-automotive applications?

A: Yes. CLVC573AQPWRG4Q1 is automotive-qualified (AEC-Q100) but functions in standard industrial and commercial applications. The automotive qualification represents an additional quality assurance level. The 1ns propagation delay is faster than the 74LCX573MTC (1.5ns), which may require timing verification in delay-sensitive circuits.

Q: What is the Moisture Sensitivity Level (MSL) significance?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions and does not require special handling or baking procedures before soldering. All recommended substitutes maintain MSL 1 or equivalent specifications, ensuring consistent manufacturing processes.

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