74AC573MTC Equivalent & Substitute Parts

Part Overview

The 74AC573MTC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. The 74AC573 series provides transparent latch functionality suitable for data storage and bus interface applications in digital logic circuits.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	2V ~ 6V
Independent Circuits	1
Propagation Delay	8.5ns
Output Current (High/Low)	24mA / 24mA
Operating Temperature Range	-40°C ~ 85°C
Package Type	20-TSSOP
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74AC573MTC are classified based on the following critical parameters that determine functional and physical compatibility:

Primary Substitution Criteria:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 2V ~ 6V
Operating Temperature Range: -40°C ~ 85°C
Moisture Sensitivity Level: 1 (Unlimited)

Package Compatibility Levels:

Direct Package Match (20-TSSOP): MC74AC573DTR2G, SN74AC573PW, SN74AC573PWR
Alternative Package (20-SSOP): SN74AC573DBR
Parametric Equivalent (Different Base Number): SN74AC373PW

Substitutes are grouped by the degree of electrical and mechanical compatibility with the original 74AC573MTC specification.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Supply Voltage	Propagation Delay (ns)	Output Current (mA)	Operating Temp (°C)	Package	Product Status
74AC573MTC	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	8.5	24 / 24	-40 ~ 85	20-TSSOP	Obsolete
MC74AC573DTR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	10	24 / 24	-40 ~ 85	20-TSSOP	Active
SN74AC573DBR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5	24 / 24	-40 ~ 85	20-SSOP	Active
SN74AC573PW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5	24 / 24	-40 ~ 85	20-TSSOP	Discontinued at DiGi Electronics
SN74AC573PWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5	24 / 24	-40 ~ 85	20-TSSOP	Active
SN74AC373PW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5	24 / 24	-40 ~ 85	20-TSSOP	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for New Designs):

MC74AC573DTR2G (onsemi): Active product status with identical package (20-TSSOP) and electrical specifications. RoHS3 compliant. Propagation delay of 10ns is within acceptable tolerance for most applications.
SN74AC573PWR (Texas Instruments): Active product status with identical package (20-TSSOP) and electrical specifications. RoHS3 compliant. Faster propagation delay (2.5ns) provides performance margin.

Tier 2 - Compatible Substitutes (Package Consideration Required):

SN74AC573DBR (Texas Instruments): Active product status with identical electrical specifications but alternative package (20-SSOP, 5.30mm width vs. 20-TSSOP, 4.40mm width). PCB layout modification required. RoHS3 compliant.

Tier 3 - Parametric Equivalents (Base Number Variation):

SN74AC373PW (Texas Instruments): Parametric equivalent with different base product number (74AC373 vs. 74AC573). Identical electrical and package specifications. Discontinued at DiGi Electronics; limited availability.

All substitute parts maintain compliance with REACH regulations and EAR99 export classification. Moisture Sensitivity Level 1 (Unlimited) is consistent across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can MC74AC573DTR2G directly replace 74AC573MTC without PCB modifications? A: Yes. MC74AC573DTR2G shares identical package type (20-TSSOP), pin configuration, and electrical specifications. No PCB layout changes are required.

Q: What is the difference between 20-TSSOP and 20-SSOP packages? A: Both are surface-mount packages with 20 pins. The 20-TSSOP measures 4.40mm in width, while 20-SSOP measures 5.30mm in width. PCB footprint and land pattern differ; verify design compatibility before substitution.

Q: Why does SN74AC573PWR have faster propagation delay (2.5ns vs. 8.5ns)? A: Propagation delay variation reflects manufacturing process differences between onsemi and Texas Instruments. Faster delay provides improved timing performance and is functionally compatible with designs specified for the original part.

Q: Is SN74AC373PW a suitable replacement for 74AC573MTC? A: SN74AC373PW is a parametric equivalent with identical electrical and package specifications but uses a different base product number (74AC373 vs. 74AC573). Functional compatibility is maintained; however, this part is discontinued at DiGi Electronics, limiting availability.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All active and discontinued substitute parts listed maintain RoHS3 compliance status.

Q: What is the inventory status for substitute parts? A: MC74AC573DTR2G (9556 pcs), SN74AC573PWR (10400 pcs), and SN74AC573DBR (3064 pcs) are available in stock as new original components. SN74AC573PW and SN74AC373PW have limited inventory (1579 pcs and 903 pcs respectively) and are discontinued at DiGi Electronics.

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