SN74ABT533ADW Equivalent & Substitute Parts

Part Overview

The SN74ABT533ADW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output capability. This component is classified as obsolete, which necessitates identification of active equivalent alternatives 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-SOIC package suitable for surface mount applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74ABT533ADW
Manufacturer	Texas Instruments
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	4.9ns
Current - Output High, Low	32mA, 64mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SN74ABT533ADW are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Logic Type: D-Type Transparent Latch (identical function)
Circuit Configuration: 8:8 (identical channel count and bit width)
Output Type: Tri-State (identical output capability)
Voltage - Supply: 4.5V ~ 5.5V (identical operating voltage)
Independent Circuits: 1 (identical circuit count)
Current - Output High, Low: 32mA, 64mA (identical output current specifications)
Operating Temperature: -40°C ~ 85°C (identical temperature range)
RoHS Status: ROHS3 Compliant (identical compliance)

Substitutes are further differentiated by package type and product status. The SN74ABT533APWR represents a manufacturer-recommended alternative with active product status but different packaging (20-TSSOP). The SN74ABT373DW and SN74ABT573ADW are parametric equivalents maintaining the same 20-SOIC package footprint with active product status and minor propagation delay variations within acceptable engineering tolerances.

Parameter Comparison

Parameter	SN74ABT533ADW (Main)	SN74ABT533APWR	SN74ABT373DW	SN74ABT573ADW
Manufacturer	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
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	4.9ns	4.9ns	4.6ns	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
Package / Case	20-SOIC	20-TSSOP	20-SOIC	20-SOIC
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the SN74ABT533ADW, the following selection criteria apply based on product status and compliance:

SN74ABT533APWR is the manufacturer-recommended substitute, maintaining identical electrical specifications and propagation delay. This part carries active product status and ROHS3 compliance. The primary consideration is packaging: this substitute uses 20-TSSOP instead of 20-SOIC, requiring PCB layout modification and different land pattern implementation.

SN74ABT373DW and SN74ABT573ADW are parametric equivalents that maintain the 20-SOIC package footprint, eliminating PCB redesign requirements. Both parts carry active product status and ROHS3 compliance. The SN74ABT373DW provides 4.6ns propagation delay, while the SN74ABT573ADW offers improved performance at 4ns propagation delay. Both values remain within acceptable engineering tolerances relative to the original 4.9ns specification.

All substitute options maintain identical supply voltage range, output current specifications, operating temperature range, and tri-state output capability, ensuring functional compatibility within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the SN74ABT533APWR be used as a direct replacement for the SN74ABT533ADW?

A: The SN74ABT533APWR is electrically equivalent with identical propagation delay and output specifications. However, it uses 20-TSSOP packaging instead of 20-SOIC, requiring PCB land pattern modification. Pin-to-pin functionality is preserved.

Q: What is the difference between the SN74ABT373DW and SN74ABT573ADW?

A: Both parts are parametric equivalents with identical 20-SOIC packaging and electrical specifications. The primary difference is propagation delay: SN74ABT373DW operates at 4.6ns while SN74ABT573ADW operates at 4ns. Both values are within acceptable tolerance of the original 4.9ns specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The SN74ABT533ADW and all listed substitute parts (SN74ABT533APWR, SN74ABT373DW, SN74ABT573ADW) are ROHS3 compliant.

Q: Can I use these substitutes in existing PCB designs without modification?

A: The SN74ABT373DW and SN74ABT573ADW maintain the 20-SOIC package and can be used as direct PCB replacements. The SN74ABT533APWR requires PCB modification due to its 20-TSSOP package format.

Q: Do all substitute parts operate within the same voltage and temperature range?

A: Yes. All substitute parts operate within 4.5V to 5.5V supply voltage and -40°C to 85°C operating temperature range, matching the original SN74ABT533ADW specifications.

Q: What is the inventory status of these substitute parts?

A: SN74ABT533APWR has 699 units in stock, SN74ABT373DW has 1031 units in stock, and SN74ABT573ADW has 2316 units in stock. All parts are available as new original components.

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