74F245SC Equivalent & Substitute Parts

Part Overview

The 74F245SC 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-SOIC 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

74F245SC

onsemiIn Stock: 219974F245SC Datasheet

Current PartRFQ

SN74F245DWR

Texas InstrumentsIn Stock: 2571SN74F245DWR Datasheet

DirectRFQ

SN74F245NSR

Texas InstrumentsIn Stock: 2086SN74F245NSR Datasheet

SimilarRFQ

SN74BCT245DW

Texas InstrumentsIn Stock: 1322SN74BCT245DW Datasheet

Parametric EquivalentRFQ

SN74F245DW

Texas InstrumentsIn Stock: 2240SN74F245DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F245SC is determined by strict equivalence across the following critical parameters: logic type (non-inverting transceiver), element count (1), bit width (8 bits per element), output configuration (3-state), output current specifications (3mA/24mA and 15mA/64mA), supply voltage range (4.5V ~ 5.5V), operating temperature range (0°C ~ 70°C), and package type (20-SOIC with 0.295" width).

Substitute parts are categorized as follows:

Direct Manufacturer Equivalent: SN74F245DWR matches all electrical and mechanical parameters with identical 20-SOIC packaging and differs only in packaging format (Tape & Reel versus tube).

Similar Equivalent: SN74F245NSR maintains all electrical specifications but uses a 20-SO package with reduced width (0.209", 5.30mm), requiring PCB layout verification for pin-to-pin compatibility.

Parametric Equivalents: SN74BCT245DW and SN74F245DW both satisfy all electrical and mechanical requirements with identical 20-SOIC packaging but differ in series designation and product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SN74F245DWR is the recommended substitute. It is manufactured by Texas Instruments, maintains active product status, achieves ROHS3 compliance, and provides identical electrical and mechanical specifications to the 74F245SC. The Tape & Reel packaging format is standard for production environments.

Secondary Selection: SN74F245DW offers equivalent electrical performance with identical 20-SOIC packaging but carries Last Time Buy status, indicating limited future availability. This part is suitable for legacy system maintenance where immediate component sourcing is required.

Alternative Selection: SN74BCT245DW provides parametric equivalence across all critical electrical parameters and identical mechanical packaging. However, Last Time Buy status and series designation change (74BCT versus 74F) require confirmation of timing characteristics for specific application requirements.

Package Variant: SN74F245NSR maintains full electrical equivalence but uses a narrower 20-SO package (0.209" width versus 0.295"). This part is suitable only when PCB layout accommodates the reduced package width and pin spacing remains compatible with existing footprints.

Frequently Asked Questions (FAQ)

Q: Can SN74F245DWR be used as a direct replacement for 74F245SC?

A: Yes. SN74F245DWR satisfies all electrical and mechanical requirements specified for the 74F245SC. Both parts operate at 4.5V to 5.5V supply voltage, deliver identical output current specifications, and are housed in 20-SOIC packages with 0.295" width. The primary difference is packaging format (Tape & Reel versus tube) and manufacturer (Texas Instruments versus onsemi).

Q: What is the difference between SN74F245DWR and SN74F245NSR?

A: Both parts are manufactured by Texas Instruments and maintain identical electrical specifications. The key difference is package type: SN74F245DWR uses a 20-SOIC package with 0.295" width, while SN74F245NSR uses a 20-SO package with 0.209" width. The narrower package of SN74F245NSR requires PCB layout verification to ensure pin-to-pin compatibility with existing designs.

Q: Why is SN74BCT245DW listed as a parametric equivalent rather than a direct equivalent?

A: SN74BCT245DW belongs to the 74BCT logic series rather than the 74F series. While all electrical parameters and mechanical specifications match the 74F245SC, the series designation indicates potential differences in timing characteristics and propagation delays. Confirmation of timing requirements is necessary before substitution in timing-critical applications.

Q: What does Last Time Buy status mean for SN74F245DW and SN74BCT245DW?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for these parts. Existing inventory may be available for purchase, but future production is not planned. These parts are suitable for immediate replacement needs but should not be selected for new long-term production designs.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitute parts (SN74F245DWR, SN74F245NSR, SN74BCT245DW, and SN74F245DW) are ROHS3 compliant. The original 74F245SC manufactured by onsemi does not specify RoHS status in available documentation.

Q: What packaging formats are available for the 74F245 transceiver?

A: The substitute parts are available in three packaging formats: Tape & Reel (SN74F245DWR and SN74F245NSR), Tube (SN74BCT245DW and SN74F245DW), and the original Tube format for 74F245SC. Selection depends on production volume requirements and inventory management practices.