74ACT533SC Equivalent & Substitute Parts

Part Overview

The 74ACT533SC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with 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-SOIC surface mount package.

Substiute Parts

74ACT533SC

onsemiIn Stock: 95874ACT533SC Datasheet

Current PartRFQ

SN74ACT533DW

Texas InstrumentsIn Stock: 1775SN74ACT533DW Datasheet

SimilarRFQ

SN74ACT573DW

Texas InstrumentsIn Stock: 2818SN74ACT573DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT533SC are identified based on strict electrical and mechanical parameter matching within the 74ACT logic family. The substitution criteria are:

Critical Parameters for Substitution:

• Logic Type: D-Type Transparent Latch
• Circuit Configuration: 8:8
• Output Type: Tri-State
• Voltage - Supply: 4.5V ~ 5.5V
• Independent Circuits: 1
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C

Substitution Categories:

Similar Manufacturer Part: SN74ACT533DW (Texas Instruments) — Identical base product number (74ACT533) with matching electrical specifications and package configuration. Product status is Active.

Parametric Equivalent: SN74ACT573DW (Texas Instruments) — Matches all critical electrical parameters and package specifications. Different base product number (74ACT573) but functionally equivalent within the allowed parameter set. Product status is Discontinued at DiGi Electronics.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74ACT533DW (Texas Instruments)

The SN74ACT533DW is the recommended substitute for the obsolete 74ACT533SC. This part maintains identical base product designation (74ACT533), matching all critical electrical and mechanical parameters. The SN74ACT533DW is currently in Active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. The propagation delay of 2.5ns is superior to the original 6ns specification, providing performance headroom in timing-critical applications.

Secondary Equivalent: SN74ACT573DW (Texas Instruments)

The SN74ACT573DW serves as a parametric equivalent with matching electrical specifications and identical package configuration. This part meets all substitution criteria based on allowed parameters. However, product status is listed as Discontinued at DiGi Electronics, which may impact long-term sourcing. The SN74ACT573DW carries ROHS3 compliance certification and maintains the original 6ns propagation delay specification.

Both substitute parts are surface mount components in 20-SOIC packaging, compatible with existing PCB layouts designed for the 74ACT533SC.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT533DW directly replace the 74ACT533SC without PCB modifications?

A: Yes. The SN74ACT533DW is pin-compatible and functionally equivalent. Both parts use the 20-SOIC package with identical pinout, supply voltage range (4.5V ~ 5.5V), and output specifications (24mA tri-state). No PCB layout changes are required.

Q: What is the difference between the SN74ACT533DW and SN74ACT573DW?

A: Both parts meet the critical substitution parameters for the 74ACT533SC. The primary difference is the base product number (74ACT533 versus 74ACT573). The SN74ACT533DW is the direct equivalent with identical part designation. The SN74ACT573DW is a parametric equivalent that matches all electrical and mechanical specifications but carries a different base product number. The SN74ACT533DW is recommended as the primary choice due to Active product status.

Q: Are there compliance differences between the substitute parts?

A: Both Texas Instruments substitutes (SN74ACT533DW and SN74ACT573DW) are ROHS3 compliant. The original 74ACT533SC does not specify RoHS status. Both substitutes carry identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring regulatory compatibility.

Q: Why is the propagation delay different in the SN74ACT533DW (2.5ns vs. 6ns)?

A: The SN74ACT533DW specification of 2.5ns represents improved performance compared to the original 6ns. This faster propagation delay is within acceptable substitution parameters and provides timing margin in circuit designs. Applications with strict timing requirements should verify that the faster response does not introduce signal integrity issues.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All three parts (74ACT533SC, SN74ACT533DW, and SN74ACT573DW) carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions during storage or handling.