DM74ALS573BSJ Equivalent & Substitute Parts

Part Overview

The DM74ALS573BSJ is a D-Type Transparent Latch logic IC with 1 channel, 8:8 configuration, and tri-state output capability. Manufactured by onsemi in a 20-SOP package, this component is classified as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts from active manufacturers is essential for design continuity and procurement reliability.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Supply Voltage Range	4.5V ~ 5.5V
Independent Circuits	1
Propagation Delay Time	2ns
Output Current (High/Low)	2.6mA / 24mA
Operating Temperature Range	0°C ~ 70°C
Mounting Type	Surface Mount
Series	74ALS
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DM74ALS573BSJ are identified based on strict electrical and mechanical compatibility criteria. All substitute candidates maintain identical functional specifications across the following critical parameters:

Logic type: D-Type Transparent Latch
Circuit configuration: 8:8
Output type: Tri-State
Supply voltage: 4.5V ~ 5.5V
Propagation delay: 2ns
Output current ratings: 2.6mA / 24mA
Operating temperature: 0°C ~ 70°C
Series designation: 74ALS
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped by packaging format and product status. Package variations (20-SOP vs. 20-SOIC) represent different physical dimensions but maintain electrical equivalence. Product status differentiation indicates availability and long-term procurement viability.

Parameter Comparison

Parameter	DM74ALS573BSJ (onsemi)	SN74ALS573CNSR (TI)	SN74ALS573CDW (TI)	SN74ALS573CDWR (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
Supply Voltage	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Independent Circuits	1	1	1	1
Propagation Delay	2ns	2ns	2ns	2ns
Output Current (High/Low)	2.6mA / 24mA	2.6mA / 24mA	2.6mA / 24mA	2.6mA / 24mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOP (0.209", 5.30mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: SN74ALS573CDWR

The SN74ALS573CDWR from Texas Instruments is the recommended substitute for the obsolete DM74ALS573BSJ. This part maintains active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification and is supplied in Tape & Reel packaging format, supporting automated assembly processes. The 20-SOIC package (0.295", 7.50mm width) differs physically from the original 20-SOP but maintains full electrical equivalence.

Secondary Substitute: SN74ALS573CNSR

The SN74ALS573CNSR offers an alternative with active product status and identical electrical specifications. This variant uses a narrower 20-SOIC package (0.209", 5.30mm width), providing closer physical compatibility with the original 20-SOP footprint. Tape & Reel packaging supports high-volume production requirements.

Tertiary Option: SN74ALS573CDW

The SN74ALS573CDW maintains electrical equivalence but carries Last Time Buy status, indicating limited future availability. This part is suitable only for applications where immediate procurement is feasible and long-term supply is not a constraint.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS573CDWR directly replace DM74ALS573BSJ in existing designs?

A: Electrical replacement is direct. The SN74ALS573CDWR maintains identical functional specifications, supply voltage, output characteristics, and operating temperature range. Physical package dimensions differ (20-SOIC 0.295" vs. 20-SOP 0.209"), requiring PCB layout verification to confirm footprint compatibility.

Q: What is the difference between 20-SOP and 20-SOIC packages?

A: Both are surface-mount packages with 20 pins. The primary difference is body width: 20-SOP measures 0.209" (5.30mm) while 20-SOIC measures either 0.209" (5.30mm) or 0.295" (7.50mm) depending on the variant. Pin pitch and electrical characteristics remain identical. PCB footprint compatibility must be confirmed before substitution.

Q: Why is the original DM74ALS573BSJ classified as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. Texas Instruments continues manufacturing functionally equivalent 74ALS573 variants, providing continuity for this logic function.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments substitutes (SN74ALS573CNSR, SN74ALS573CDW, SN74ALS573CDWR) carry ROHS3 compliance certification. The original DM74ALS573BSJ is listed as REACH Unaffected.

Q: What packaging formats are available for substitutes?

A: SN74ALS573CNSR and SN74ALS573CDWR are supplied in Tape & Reel format, suitable for automated assembly. SN74ALS573CDW is supplied in Tube format. Selection depends on production volume and assembly process requirements.

Q: Do all parts share identical electrical performance?

A: Yes. All listed parts maintain identical propagation delay (2ns), output current ratings (2.6mA / 24mA), supply voltage range (4.5V ~ 5.5V), and operating temperature (0°C ~ 70°C). Electrical substitution is direct across all variants.

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