74ACT245MSAX Equivalent & Substitute Parts

Part Overview

The 74ACT245MSAX is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ACT245MSAX

onsemiIn Stock: 174274ACT245MSAX Datasheet

Current PartRFQ

CD74ACT245SM96

Texas InstrumentsIn Stock: 778CD74ACT245SM96 Datasheet

SimilarRFQ

SN74ACT245PWR

Texas InstrumentsIn Stock: 3994SN74ACT245PWR Datasheet

SimilarRFQ

SN74ACT245DBR

Texas InstrumentsIn Stock: 5490SN74ACT245DBR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT245MSAX is determined by the following critical parameters:

• Logic Function: Transceiver, Non-Inverting with 1 Element and 8 Bits per Element
• Output Configuration: 3-State output capability
• Electrical Performance: 24mA output current (high and low), 4.5V to 5.5V supply voltage
• Package Compatibility: 20-SSOP or 20-TSSOP surface mount packages
• Operating Temperature Range: Minimum -40°C to 85°C

The identified substitute parts maintain these core electrical and functional parameters. Variations in package dimensions (SSOP vs. TSSOP) and product status (active vs. obsolete) are noted but do not affect functional equivalence when PCB layout accommodates the specific package footprint.

Parameter Comparison

Engineering Selection Recommendations

Direct Package Match (20-SSOP):

• SN74ACT245DBR (Texas Instruments): Identical package footprint, identical operating temperature range, active product status with ROHS3 compliance. This part provides the most direct replacement path with no PCB layout modifications required.
• CD74ACT245SM96 (Texas Instruments): Identical package footprint and electrical specifications. Extended operating temperature range (-55°C to 125°C) provides additional thermal margin. Active product status with ROHS3 compliance.

Alternative Package (20-TSSOP):

• SN74ACT245PWR (Texas Instruments): Functionally equivalent with identical electrical performance and operating temperature range. Package footprint differs (20-TSSOP vs. 20-SSOP), requiring PCB layout verification. Active product status with ROHS3 compliance.

All substitute parts are manufactured by Texas Instruments and carry active product status, ensuring long-term availability and supply chain stability compared to the obsolete onsemi original.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT245PWR be used as a direct replacement for 74ACT245MSAX? A: SN74ACT245PWR is functionally equivalent but uses a 20-TSSOP package instead of 20-SSOP. The electrical specifications and pin configuration are identical. PCB layout must accommodate the different package footprint dimensions (4.40mm width for TSSOP vs. 5.30mm width for SSOP).

Q: What is the difference between CD74ACT245SM96 and SN74ACT245DBR? A: Both parts are functionally equivalent with identical 20-SSOP packaging. CD74ACT245SM96 offers an extended operating temperature range (-55°C to 125°C) compared to SN74ACT245DBR (-40°C to 85°C). Selection depends on thermal environment requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. CD74ACT245SM96, SN74ACT245PWR, and SN74ACT245DBR are all ROHS3 compliant, meeting current environmental and regulatory standards.

Q: Does the 74ACT245 series support bidirectional data transfer? A: Yes. The 74ACT245 is a bidirectional transceiver with 3-state output, enabling controlled data flow in both directions on the same 8-bit bus.

Q: What is the significance of the obsolete status for 74ACT245MSAX? A: Obsolete status indicates the part is no longer manufactured by onsemi. Existing inventory may be available through distributors, but long-term supply cannot be guaranteed. Migration to active alternatives (Texas Instruments parts) is recommended for new designs and ongoing production.