74ACT245MSA Equivalent & Substitute Parts

Part Overview

The 74ACT245MSA is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 bits per element and 3-state output capability in a 20-SSOP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The 74ACT245 series provides bidirectional data transmission with standardized electrical characteristics across multiple manufacturers and package variants.

Substiute Parts

74ACT245MSA

onsemiIn Stock: 85074ACT245MSA Datasheet

Current PartRFQ

SN74ACT245DBR

Texas InstrumentsIn Stock: 5490SN74ACT245DBR Datasheet

DirectRFQ

CD74ACT245SM96

Texas InstrumentsIn Stock: 778CD74ACT245SM96 Datasheet

SimilarRFQ

SN74ACT245PWR

Texas InstrumentsIn Stock: 3994SN74ACT245PWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT245MSA is determined by strict equivalence in the following core parameters: logic type (non-inverting transceiver), element and bit configuration (1 element, 8 bits per element), output type (3-state), output current capability (24mA high and low), supply voltage range (4.5V ~ 5.5V), and base product number (74ACT245). Package variants and operating temperature ranges represent secondary considerations that may affect physical integration and environmental suitability but do not prevent functional substitution when electrical specifications remain identical.

The substitute parts are grouped into two categories:

Direct Substitutes (Identical Package): SN74ACT245DBR maintains the 20-SSOP package footprint and identical operating temperature range, providing pin-for-pin compatibility.

Compatible Substitutes (Package Variant): SN74ACT245PWR uses a 20-TSSOP package with reduced width (4.40mm vs 5.30mm), and CD74ACT245SM96 extends the operating temperature range to -55°C ~ 125°C while maintaining the 20-SSOP footprint. Both retain all critical electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT245DBR is the primary substitute for the 74ACT245MSA. It provides identical electrical specifications, package footprint, and operating temperature range. As an active product from Texas Instruments with ROHS3 compliance and established supply chain availability (5400 pcs in stock), this part eliminates obsolescence risk while maintaining full design compatibility.

SN74ACT245PWR serves as an alternative when PCB space constraints favor a narrower package footprint (20-TSSOP vs 20-SSOP). The reduced width (4.40mm vs 5.30mm) may enable layout optimization in space-constrained applications. All electrical parameters remain equivalent to the original part. This option requires PCB redesign to accommodate the different package geometry.

CD74ACT245SM96 is suitable for applications requiring extended operating temperature range (-55°C ~ 125°C). This part maintains the original 20-SSOP package footprint and all electrical specifications. Selection of this variant is appropriate only when the extended temperature capability is a design requirement.

All three substitutes are active products with ROHS3 compliance and REACH unaffected status, providing regulatory continuity and long-term procurement stability.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT245DBR replace 74ACT245MSA directly without PCB modification?

A: Yes. SN74ACT245DBR is pin-for-pin compatible with identical package footprint (20-SSOP), electrical specifications, and operating temperature range. No PCB redesign is required.

Q: What is the difference between the 20-SSOP and 20-TSSOP packages?

A: Both packages contain 20 pins with identical pin assignments. The primary difference is package width: 20-SSOP is 5.30mm wide, while 20-TSSOP is 4.40mm wide. The TSSOP variant (SN74ACT245PWR) is narrower and requires PCB layout modification to accommodate the different footprint.

Q: Why does CD74ACT245SM96 have a different operating temperature range?

A: CD74ACT245SM96 is specified for -55°C ~ 125°C operating temperature, compared to -40°C ~ 85°C for the original part. This extended range is a product variant characteristic and does not affect electrical functionality within the original temperature specification. Selection should be based on actual application temperature requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. SN74ACT245DBR, SN74ACT245PWR, and CD74ACT245SM96 are all ROHS3 compliant. The original 74ACT245MSA RoHS status was not specified in available documentation.

Q: What inventory availability should I expect for these substitutes?

A: Current stock levels are: SN74ACT245DBR (5400 pcs), SN74ACT245PWR (3900 pcs), and CD74ACT245SM96 (743 pcs). All parts are listed as new original stock from active product lines.

Q: Can I use these substitutes interchangeably in the same design?

A: SN74ACT245DBR and CD74ACT245SM96 are interchangeable without PCB modification due to identical 20-SSOP footprint. SN74ACT245PWR requires PCB redesign due to different package width. All three are electrically equivalent within their specified operating parameters.