SN74LS145NS Equivalent & Substitute Parts

Part Overview

The SN74LS145NS is a 1 x 4:10 decoder logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, making identification of compatible substitute parts essential for ongoing design support and procurement. The decoder function remains critical in digital logic applications requiring address decoding and signal routing. Substitute parts must maintain identical electrical specifications, package dimensions, and functional performance to ensure direct replacement capability.

Substiute Parts

SN74LS145NS

Texas InstrumentsIn Stock: 2454SN74LS145NS Datasheet

Current PartRFQ

SN74LS145NSR

Texas InstrumentsIn Stock: 3310SN74LS145NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS145NS is determined by strict equivalence across the following critical parameters:

• Decoder Circuit Configuration: 1 x 4:10 (identical input-to-output decoding function)
• Package Type: 16-SOIC surface mount package with 0.209" width and 5.30mm dimensions
• Electrical Specifications: Voltage supply range 4.75V ~ 5.25V, output current 80mA maximum
• Operating Temperature Range: 0°C ~ 70°C
• Compliance Standards: ROHS3 compliance and MSL Level 1 rating

The SN74LS145NSR qualifies as a direct substitute based on complete alignment with all specified parameters. The primary distinction is product status and packaging format availability, not functional or electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS145NSR is a direct functional equivalent to the SN74LS145NS. Both parts share identical electrical specifications, package dimensions, and circuit configuration. The SN74LS145NSR is currently active in production status, whereas the SN74LS145NS is discontinued, making the NSR variant the appropriate selection for new designs and ongoing procurement requirements.

Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols. The difference in packaging format (Tube versus Cut Tape & Digi-Reel) does not affect component functionality and represents only a supply chain or inventory management consideration.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS145NSR replace the SN74LS145NS in existing designs?

A: Yes. The SN74LS145NSR is a direct substitute. All electrical parameters, package dimensions, and functional specifications are identical. The component can be used as a pin-for-pin replacement without circuit modification.

Q: What is the difference between the NS and NSR suffix designations?

A: The suffix indicates packaging and distribution format. NS denotes tube packaging, while NSR indicates cut tape and Digi-Reel packaging. The core semiconductor die and electrical performance are identical.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74LS145NS and SN74LS145NSR carry identical ROHS3 compliance status and MSL Level 1 rating. They meet the same regulatory and environmental standards.

Q: Why is the SN74LS145NS listed as discontinued?

A: The SN74LS145NS is discontinued at DiGi Electronics, indicating it is no longer actively stocked or distributed through that channel. The SN74LS145NSR remains in active production and is the recommended procurement option.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use the 16-SOIC surface mount package with identical pin configuration and spacing. They are fully interchangeable in PCB assembly processes without requiring design or layout modifications.