SN74AS533AN Equivalent & Substitute Parts

Part Overview

The SN74AS533AN is a D-Type Transparent Latch IC manufactured by Texas Instruments, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-DIP package suitable for through-hole mounting applications.

Substiute Parts

SN74AS533AN

Texas InstrumentsIn Stock: 2245SN74AS533AN Datasheet

Current PartRFQ

SN74ALS533AN

Texas InstrumentsIn Stock: 858SN74ALS533AN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS533AN is determined by strict equivalence across the following critical parameters:

• Logic Type: D-Type Transparent Latch (functional architecture must remain identical)
• Circuit Configuration: 8:8 (input/output channel count must match)
• Output Type: Tri-State (output stage configuration must be preserved)
• Voltage Supply Range: 4.5V ~ 5.5V (operating voltage window must be compatible)
• Independent Circuits: 1 (number of independent functional blocks must match)
• Package Type: 20-DIP (0.300", 7.62mm) (physical form factor and pin count must be identical)
• Mounting Type: Through Hole (PCB assembly method must be compatible)

The SN74ALS533AN qualifies as a direct substitute based on full alignment with these parameters. Variations in propagation delay (6ns vs. 5ns) and product status (Active vs. Obsolete) do not disqualify substitution when electrical and mechanical compatibility is maintained.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS533AN is a qualified substitute for the obsolete SN74AS533AN based on electrical and mechanical parameter equivalence. Both parts maintain identical logic functionality, circuit configuration, output characteristics, and physical packaging. The SN74ALS533AN offers the additional advantage of Active product status, ensuring continued availability and manufacturing support.

Both parts satisfy ROHS3 compliance requirements and operate within identical voltage and temperature specifications. The propagation delay differential (1ns) between the 74AS and 74ALS series does not constitute a functional incompatibility for latch applications where timing margins are typically sufficient to accommodate this variation.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS533AN directly replace the SN74AS533AN in existing designs?

A: Yes. The SN74ALS533AN maintains full electrical and mechanical compatibility with the SN74AS533AN. Both parts feature identical logic type, circuit configuration, output type, voltage supply range, and 20-DIP package specifications.

Q: What is the significance of the propagation delay difference between these parts?

A: The SN74ALS533AN exhibits a 6ns propagation delay compared to the SN74AS533AN's 5ns specification. This 1ns difference is within typical design margins for latch circuits and does not affect functional compatibility in standard applications.

Q: Why is the SN74AS533AN classified as obsolete?

A: The SN74AS533AN has reached end-of-life status with Texas Instruments. The SN74ALS533AN, as an active product, provides continued manufacturing support and availability for new designs and production requirements.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. Compliance certifications are equivalent across both components.

Q: Does the packaging format differ between these parts?

A: No. Both the SN74AS533AN and SN74ALS533AN utilize identical 20-DIP (0.300", 7.62mm) through-hole packaging, ensuring direct PCB compatibility without layout modifications.