74ABT573CMSA Equivalent & Substitute Parts

Part Overview

The 74ABT573CMSA 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 equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP surface mount package.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	4.5V ~ 5.5V
Independent Circuits	1
Delay Time - Propagation	2.7ns
Current - Output High, Low	32mA, 64mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ABT573CMSA is determined by the following critical parameters:

Logic Type & Circuit Configuration: All substitute parts must be D-Type Transparent Latch devices with 8:8 circuit configuration
Output Type: Tri-state output capability is required
Supply Voltage: 4.5V ~ 5.5V operating range must be maintained
Independent Circuits: Single channel configuration (1 circuit)
Output Current Ratings: 32mA high, 64mA low output current capability
Operating Temperature Range: -40°C ~ 85°C
Mounting Type: Surface mount only
Base Product Number: 74ABT573 series

Substitute parts are grouped by package type variation (20-SSOP vs. 20-TSSOP) and packaging format (Cut Tape, Tube, Tape & Reel). All identified substitutes maintain electrical equivalence while differing in physical package dimensions and supply formats.

Parameter Comparison

Parameter	74ABT573CMSA (onsemi)	SN74ABT573ADBR (TI)	SN74ABT573APW (TI)	SN74ABT573APWR (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	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
Output Type	Tri-State	Tri-State	Tri-State	Tri-State
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Independent Circuits	1	1	1	1
Delay Time - Propagation	2.7ns	4ns	4ns	4ns
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SN74ABT573ADBR is the direct package equivalent, maintaining the 20-SSOP form factor identical to the original 74ABT573CMSA. This part is manufactured by Texas Instruments and carries Active product status with ROHS3 compliance, making it suitable for new designs requiring the same PCB footprint.

SN74ABT573APW and SN74ABT573APWR utilize the 20-TSSOP package, which features a narrower 4.40mm width compared to the 20-SSOP 5.30mm width. These parts require PCB layout modification but offer the same electrical performance. Both are Active status products with ROHS3 compliance. SN74ABT573APWR is supplied in Tape & Reel format, while SN74ABT573APW is supplied in Tube format.

All substitute parts are manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability compared to the obsolete onsemi original. All substitutes maintain electrical equivalence across supply voltage, output current, operating temperature, and logic function parameters.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT573ADBR directly replace 74ABT573CMSA without PCB modification?

A: Yes. SN74ABT573ADBR maintains identical 20-SSOP package dimensions (0.209", 5.30mm width) and pin configuration, allowing direct PCB footprint compatibility without layout changes.

Q: What is the difference between SN74ABT573APW and SN74ABT573APWR?

A: Both parts are electrically identical and use the 20-TSSOP package. The difference is packaging format: SN74ABT573APW is supplied in Tube, while SN74ABT573APWR is supplied in Tape & Reel (TR). Selection depends on assembly process requirements and order quantities.

Q: Why do the Texas Instruments substitutes show 4ns propagation delay versus 2.7ns for the original?

A: Propagation delay specifications differ between manufacturers. The 4ns specification for Texas Instruments parts remains within acceptable logic timing parameters for 74ABT573 series applications. Verify timing requirements against your specific circuit design.

Q: Can I use the 20-TSSOP package variants (SN74ABT573APW, SN74ABT573APWR) as substitutes?

A: Electrically yes, but PCB layout modification is required. The 20-TSSOP package is narrower (4.40mm) than the 20-SSOP package (5.30mm), necessitating footprint redesign. Use SN74ABT573ADBR for direct replacement without layout changes.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitutes (SN74ABT573ADBR, SN74ABT573APW, SN74ABT573APWR) are ROHS3 compliant. The original onsemi part RoHS status is not specified in available documentation.

Q: What is the MSL rating for these parts?

A: All parts, including the original and all substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage and handling.

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