DM74LS573N Equivalent & Substitute Parts

Part Overview

The DM74LS573N is a D-Type Transparent Latch IC with 8:8 circuit configuration and tri-state output, manufactured by onsemi in a 20-PDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where legacy compatibility is required. The part operates within a 4.75V to 5.25V supply voltage range and is suitable for through-hole mounting applications.

Substiute Parts

DM74LS573N

onsemiIn Stock: 1995DM74LS573N Datasheet

Current PartRFQ

SN74ALS573CN

Texas InstrumentsIn Stock: 2299SN74ALS573CN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS573N is determined by the following critical parameters:

• Logic Function: D-Type Transparent Latch with identical 8:8 circuit configuration and tri-state output capability
• Package Compatibility: 20-DIP (0.300", 7.62mm) form factor for direct pin-compatible replacement
• Electrical Characteristics: Supply voltage range, output current ratings, and propagation delay specifications
• Mounting Type: Through-hole mounting requirement
• Operating Temperature Range: 0°C to 70°C minimum specification

The SN74ALS573CN from Texas Instruments meets all substitution criteria as an active, pin-compatible alternative with enhanced electrical performance and improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS573CN is a direct functional substitute for the DM74LS573N based on identical logic function, circuit configuration, and package form factor. Key advantages of the SN74ALS573CN include:

• Active Product Status: Ensures ongoing availability and manufacturing support, eliminating supply chain risk associated with obsolete components
• Enhanced Compliance: ROHS3 compliance status meets current regulatory requirements, whereas the DM74LS573N is RoHS non-compliant
• Improved Performance: Propagation delay of 2ns versus 27ns provides superior switching speed while maintaining identical output current specifications
• Extended Supply Voltage Range: 4.5V to 5.5V operating range provides broader voltage tolerance compared to the 4.75V to 5.25V specification of the original part

Both components share identical output current ratings (2.6mA high, 24mA low) and operating temperature specifications, ensuring functional compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS573CN directly replace the DM74LS573N without circuit modification?

A: Yes. Both components are pin-compatible 20-DIP packages with identical D-Type Transparent Latch 8:8 configuration and tri-state output. No circuit board modifications are required for direct substitution.

Q: What is the difference between the 74LS and 74ALS logic families?

A: The 74ALS series represents an advanced low-power Schottky variant with improved propagation delay (2ns versus 27ns) while maintaining identical output current specifications. Both families operate within compatible voltage ranges and share the same functional logic.

Q: Are there any voltage compatibility concerns when substituting the SN74ALS573CN?

A: The SN74ALS573CN operates across 4.5V to 5.5V, which encompasses the DM74LS573N specification of 4.75V to 5.25V. Systems designed for the original part will operate within the substitute's voltage range without adjustment.

Q: Does the faster propagation delay of the SN74ALS573CN affect system timing?

A: The SN74ALS573CN's 2ns propagation delay is significantly faster than the DM74LS573N's 27ns. In systems with timing-critical paths, this improvement may reduce overall circuit delay. Verify that faster switching does not introduce timing violations in your specific application.

Q: What is the packaging difference between the DM74LS573N and SN74ALS573CN?

A: Both components use identical 20-DIP (0.300", 7.62mm) through-hole packages. The SN74ALS573CN is supplied in tube packaging, whereas the DM74LS573N was supplied in standard packaging. Pin assignments and footprints are identical.

Q: Is the SN74ALS573CN suitable for new designs?

A: Yes. The SN74ALS573CN is an active product with ROHS3 compliance, making it appropriate for new design implementations. The DM74LS573N, being obsolete and RoHS non-compliant, should not be specified for new designs.