MM74HC573SJ Equivalent & Substitute Parts

Part Overview

The MM74HC573SJ is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply voltage range and is housed in a 20-SOP surface mount package.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC573SJ
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	2V ~ 6V
Delay Time - Propagation	15ns
Current - Output High, Low	7.8mA, 7.8mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MM74HC573SJ is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Voltage Supply Range: 2V ~ 6V (minimum requirement)
Output Current: 7.8mA High and Low
Independent Circuits: 1
Mounting Type: Surface Mount
Base Product Number: 74HC573 series

Package Compatibility Considerations: Substitutes are grouped by package type. The MM74HC573SJ uses a 20-SOP package (0.209", 5.30mm Width). Equivalent parts may use alternative 20-pin surface mount packages (20-SOIC, 20-SSOP, 20-SO) provided they maintain electrical compatibility and fit within the specified footprint constraints of the application.

Propagation Delay Tolerance: The MM74HC573SJ specifies 15ns propagation delay. Substitute parts with equal or faster propagation delay (15ns, 23ns, or 30ns) are functionally compatible, as faster switching does not compromise circuit operation.

Operating Temperature Range: The MM74HC573SJ operates from -40°C to 85°C. Substitutes with equal or extended temperature ranges (-55°C to 125°C) are acceptable for standard applications. Automotive-grade variants (AEC-Q100 qualified) with extended temperature ranges provide additional qualification for demanding environments.

Parameter Comparison

Parameter	MM74HC573SJ	CD74HC573M	CD74HC573M96	SN74HC573ADBR	SN74HC573ADWR	SN74HC573AQDWRQ1	SN74HC373NS
Manufacturer	onsemi	Harris Corporation	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State	Tri-State
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Output High, Low	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Delay Time - Propagation	15ns	30ns	30ns	23ns	23ns	23ns	15ns
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	20-SOP (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SSOP (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SO (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Discontinued at DiGi Electronics
Base Product Number	74HC573	74HC573	74HC573	74HC573	74HC573	74HC573	74HC373

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

For new designs and procurement requiring active product status, the following parts are recommended:

CD74HC573M96 (Texas Instruments): Active product with ROHS3 compliance, extended operating temperature range (-55°C to 125°C), and 20-SOIC package. Suitable for applications requiring long-term availability and environmental compliance.
SN74HC573ADBR (Texas Instruments): Active product with ROHS3 compliance, 20-SSOP package matching the original footprint width (0.209", 5.30mm), and 23ns propagation delay. Optimal for space-constrained PCB layouts.
SN74HC573ADWR (Texas Instruments): Active product with ROHS3 compliance and 20-SOIC package. Provides standard operating temperature range (-40°C to 85°C) matching the original specification.
SN74HC573AQDWRQ1 (Texas Instruments): Active product with automotive-grade qualification (AEC-Q100), ROHS3 compliance, extended operating temperature range (-40°C to 125°C), and 20-SOIC package. Required for automotive and mission-critical applications.

Secondary Substitutes (Obsolete or Discontinued Status):

CD74HC573M (Harris Corporation): Obsolete product with RoHS non-compliance. Not recommended for new designs or applications requiring regulatory compliance.
SN74HC373NS (Texas Instruments): Discontinued at DiGi Electronics with different base product number (74HC373 vs. 74HC573). Parametric equivalent only; verify functional compatibility with circuit requirements before selection.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance and REACH unaffected status. The MM74HC573SJ's obsolete status necessitates transition to active alternatives. For applications requiring automotive qualification, SN74HC573AQDWRQ1 is the only AEC-Q100 qualified option.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MM74HC573SJ with any of the listed substitutes?

A: Direct replacement depends on package compatibility and PCB layout constraints. SN74HC573ADBR and SN74HC373NS use 20-SOP/20-SO packages (0.209", 5.30mm width) matching the original footprint. CD74HC573M96 and SN74HC573ADWR use 20-SOIC packages (0.295", 7.50mm width) requiring PCB layout modification. All substitutes maintain electrical compatibility within the specified parameters.

Q: What is the difference between 74HC573 and 74HC373 base product numbers?

A: Both are D-Type Transparent Latch ICs with 8:8 circuit configuration and tri-state output. SN74HC373NS uses the 74HC373 base product number. Verify functional equivalence with circuit requirements and datasheet specifications before substitution.

Q: Why is CD74HC573M not recommended despite being listed as a substitute?

A: CD74HC573M is classified as obsolete and RoHS non-compliant. For new designs and applications subject to environmental regulations, active and compliant alternatives (CD74HC573M96, SN74HC573ADBR, SN74HC573ADWR, SN74HC573AQDWRQ1) are required.

Q: Which substitute offers the best long-term availability?

A: CD74HC573M96 and SN74HC573ADBR are active products from Texas Instruments with current inventory levels (16,090 and 2,100 units respectively). Both maintain ROHS3 compliance and are suitable for long-term design support.

Q: Is automotive qualification necessary for my application?

A: Automotive qualification (AEC-Q100) is required only for automotive and mission-critical applications operating in demanding environments. SN74HC573AQDWRQ1 is the only AEC-Q100 qualified option with extended operating temperature range (-40°C to 125°C).

Q: What are the propagation delay differences among substitutes?

A: MM74HC573SJ and SN74HC373NS specify 15ns propagation delay. SN74HC573ADBR and SN74HC573ADWR specify 23ns. CD74HC573M and CD74HC573M96 specify 30ns. Faster propagation delay does not compromise circuit operation; slower delays may affect timing-critical applications.

Q: Can I use 20-SOIC packages as direct replacements for 20-SOP packages?

A: 20-SOIC packages (0.295", 7.50mm width) differ from 20-SOP packages (0.209", 5.30mm width). PCB layout modification is required. Verify footprint compatibility and trace routing before substitution.

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