SN74AS823ADW Equivalent & Substitute Parts

Part Overview

The SN74AS823ADW is a single-element D-type flip-flop with 9-bit configuration, manufactured by Texas Instruments in the 74AS logic series. This component features tri-state, non-inverted outputs and operates with positive edge triggering. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The 24-SOIC package format and specific electrical characteristics define the substitution criteria for this component.

Substiute Parts

SN74AS823ADW

Texas InstrumentsIn Stock: 850SN74AS823ADW Datasheet

Current PartRFQ

SN74ABT823DW

Texas InstrumentsIn Stock: 964SN74ABT823DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS823ADW is determined by strict equivalence across the following critical parameters:

Functional Equivalence Criteria:

• D-type flip-flop architecture with single element and 9-bit configuration
• Tri-state, non-inverted output configuration
• Positive edge trigger mechanism
• 24-SOIC package format with identical physical dimensions (0.295", 7.50mm Width)
• Supply voltage range: 4.5V ~ 5.5V
• Surface mount mounting type

Electrical Performance Boundaries:

• Propagation delay specifications must not exceed the original device maximum
• Output current capabilities (high and low) must meet or exceed original specifications
• Quiescent current must remain within acceptable operational limits
• Operating temperature range may be extended without affecting backward compatibility

The SN74ABT823DW qualifies as a direct substitute based on full compliance with all functional and physical parameters, while offering improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74ABT823DW is a qualified substitute for the obsolete SN74AS823ADW based on the following engineering criteria:

Functional Compatibility: Both devices implement identical D-type flip-flop architecture with 9-bit configuration, tri-state non-inverted outputs, and positive edge triggering. The 24-SOIC package format ensures mechanical and electrical pin compatibility without PCB redesign.

Electrical Performance: The SN74ABT823DW demonstrates superior performance across all measured parameters. Propagation delay is reduced by 53% (6.1ns versus 13ns), output current capacity is increased by 33% for high output and 33% for low output, and quiescent current is reduced by 99.7% (250 µA versus 80 mA). These improvements provide enhanced system reliability and reduced power consumption.

Compliance Status: Both devices maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. The substitute part carries active product status from Texas Instruments, ensuring long-term availability and manufacturing support. The extended operating temperature range (-40°C ~ 85°C) of the substitute provides broader environmental applicability.

Supply Voltage Compatibility: Identical supply voltage specifications (4.5V ~ 5.5V) ensure direct electrical integration without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the SN74ABT823DW be used as a direct replacement for the SN74AS823ADW in existing designs?

A: Yes. Both devices share identical functional specifications, package format, pin configuration, and supply voltage requirements. The substitute part offers improved electrical performance without requiring circuit modifications.

Q: What are the key differences between the 74AS and 74ABT series?

A: The 74ABT series represents an advanced technology generation with improved propagation delay, reduced quiescent current, and increased output drive capability compared to the 74AS series. Both series maintain compatible logic levels and package formats for the SN74823 device family.

Q: Does the package format remain unchanged between these parts?

A: Yes. Both the SN74AS823ADW and SN74ABT823DW use the 24-SOIC package with identical physical dimensions (0.295", 7.50mm Width). No PCB layout modifications are required for substitution.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status. Compliance certifications are equivalent.

Q: What is the significance of the obsolete status of the original part?

A: The obsolete status of the SN74AS823ADW indicates that Texas Instruments has discontinued manufacturing. The SN74ABT823DW, with active product status, ensures continued availability for replacement, repair, and new production requirements.

Q: How does the extended operating temperature range of the substitute affect compatibility?

A: The SN74ABT823DW operating range (-40°C ~ 85°C) encompasses the original part range (0°C ~ 70°C). This extended range provides additional environmental flexibility without compromising backward compatibility for applications within the original temperature specification.