SN74AS533ADW Equivalent & Substitute Parts

Part Overview

The SN74AS533ADW is a D-Type Transparent Latch IC manufactured by Texas Instruments, featuring a single 8:8 channel configuration with tri-state output capability in a 20-SOIC surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates within a 4.5V to 5.5V supply voltage range and is designed for applications requiring transparent latch functionality with controlled output impedance.

Substiute Parts

SN74AS533ADW

Texas InstrumentsIn Stock: 1198SN74AS533ADW Datasheet

Current PartRFQ

SN74ALS533ADW

Texas InstrumentsIn Stock: 2012SN74ALS533ADW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS533ADW is determined by the following critical parameters:

• Logic Function: D-Type Transparent Latch with identical 8:8 channel configuration
• Output Architecture: Tri-state output capability
• Supply Voltage Range: 4.5V ~ 5.5V compatibility
• Package Specification: 20-SOIC surface mount form factor
• Pin Configuration: Identical pin count and signal routing
• Electrical Characteristics: Output current ratings and propagation delay within acceptable operational margins

The SN74ALS533ADW qualifies as a direct substitute based on matching all critical functional and physical parameters. The 74ALS series represents an active product line variant of the 74AS architecture, maintaining functional equivalence while offering improved availability and ongoing manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS533ADW is the qualified substitute for the obsolete SN74AS533ADW based on the following criteria:

Product Status: The SN74ALS533ADW maintains active product status with Texas Instruments, ensuring continued availability and manufacturer support. The original SN74AS533ADW is classified as obsolete, creating supply chain risk for new production and field replacements.

Compliance Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component procurement. Moisture sensitivity level (MSL) rating of 1 (Unlimited) is identical across both parts.

Functional Equivalence: The substitute part maintains identical logic function, circuit configuration, output type, supply voltage range, and package specification. The propagation delay differential of 1ns (6ns versus 5ns) remains within acceptable operational margins for D-Type transparent latch applications and does not introduce functional incompatibility.

Electrical Compatibility: Output current ratings (2.6mA high, 24mA low) and operating temperature range (0°C ~ 70°C) are identical, confirming direct electrical substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS533ADW be used as a direct replacement for the SN74AS533ADW without PCB modifications?

A: Yes. Both parts share identical pin configuration, package specification (20-SOIC), and electrical characteristics. No PCB layout changes are required for substitution.

Q: What is the significance of the 1ns propagation delay difference between the two parts?

A: The SN74ALS533ADW exhibits 6ns propagation delay compared to 5ns for the SN74AS533ADW. This 1ns difference is within typical operational tolerances for transparent latch applications and does not create functional incompatibility in standard digital logic circuits.

Q: Are there supply voltage or operating temperature restrictions when using the substitute part?

A: No. The SN74ALS533ADW maintains identical supply voltage range (4.5V ~ 5.5V) and operating temperature range (0°C ~ 70°C) as the original part. No circuit modifications are necessary.

Q: Why is the SN74ALS533ADW recommended over the obsolete SN74AS533ADW?

A: The SN74ALS533ADW is an active product with ongoing manufacturer support and availability. The original SN74AS533ADW is obsolete, creating supply chain risk and limiting long-term procurement options.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the SN74AS533ADW and SN74ALS533ADW are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity level (MSL) ratings of 1 (Unlimited).