SN74F245NS Equivalent & Substitute Parts

Part Overview

The SN74F245NS is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. This component functions as a 1-element, 8-bit per element transceiver with 3-state output capability, housed in a 20-SOIC surface mount package. The SN74F245NS is designated as Last Time Buy status, indicating that the original manufacturer has discontinued or will discontinue production. Identifying equivalent and substitute parts is necessary to ensure continued availability for new designs, production runs, and maintenance applications.

Substiute Parts

SN74F245NS

Texas InstrumentsIn Stock: 964SN74F245NS Datasheet

Current PartRFQ

SN74F245NSR

Texas InstrumentsIn Stock: 2086SN74F245NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74F245NS is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic type: Transceiver, Non-Inverting
• Number of elements: 1
• Bits per element: 8
• Output configuration: 3-State

Electrical Parameters:

• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C (TA)

Physical Parameters:

• Package type: 20-SOIC (0.209", 5.30mm Width)
• Mounting type: Surface Mount

Compliance Parameters:

• RoHS3 Compliance
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute part SN74F245NSR maintains identical functional, electrical, and physical specifications while differing in packaging format (Tape & Reel versus individual packaging) and product status (Active versus Last Time Buy). Output current specifications may vary within acceptable ranges for the 74F logic family while maintaining functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74F245NSR is the direct substitute for the SN74F245NS based on the following engineering criteria:

Product Status Consideration: The SN74F245NS carries Last Time Buy status, indicating end-of-life production. The SN74F245NSR maintains Active product status from the same manufacturer, ensuring continued availability and supply chain stability.

Functional Equivalence: Both parts share identical logic family classification (74F series), transceiver configuration, and electrical specifications. The 20-SOIC package dimensions and surface mount mounting type are identical, enabling direct PCB footprint compatibility.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL) ratings, satisfying regulatory and environmental requirements without modification.

Output Current Specifications: The SN74F245NSR provides dual output current specifications (3mA, 24mA and 15mA, 64mA), encompassing the SN74F245NS specification (15mA, 64mA). This ensures functional compatibility across all operating conditions.

Packaging Consideration: The primary difference is packaging format. The SN74F245NSR is supplied in Tape & Reel format, standard for high-volume production. For applications requiring individual component packaging, alternative sourcing or packaging services may be necessary.

Frequently Asked Questions (FAQ)

Q: Can the SN74F245NSR be used as a direct replacement for the SN74F245NS on existing PCBs?

A: Yes. Both parts use identical 20-SOIC package dimensions (0.209", 5.30mm Width) and surface mount configuration. Pin-to-pin compatibility is complete, enabling direct substitution without PCB redesign.

Q: What is the significance of the "R" suffix in SN74F245NSR?

A: The "R" suffix indicates Tape & Reel packaging format, used for automated assembly and high-volume production. The "S" suffix in SN74F245NS indicates individual packaging. The functional specifications and die are identical.

Q: Are there differences in electrical performance between these parts?

A: Both parts operate within the 4.5V ~ 5.5V supply voltage range and 0°C ~ 70°C temperature range. Output current specifications are compatible, with the SN74F245NSR providing additional current rating options while maintaining the primary specification of the original part.

Q: Why is the SN74F245NS marked as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer has ceased or will cease production of this specific part number. Customers are advised to transition to active alternatives such as the SN74F245NSR to ensure long-term supply availability.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74F245NS and SN74F245NSR are ROHS3 compliant and carry identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited), meeting environmental and regulatory requirements.

Q: What is the base product number for these parts?

A: The base product number is 74F245. Both the SN74F245NS and SN74F245NSR are variants of this base product, differing only in packaging format and product lifecycle status.