SN74LS125ANS Equivalent & Substitute Parts

Part Overview

The SN74LS125ANS is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments, featuring 4 elements with 1 bit per element and 3-state output capability. This component is classified as a Last Time Buy product, indicating that the original manufacturer has discontinued or will discontinue production. The identification of equivalent and substitute parts is necessary to ensure continued availability for new designs, production runs, and field replacements where the original part number is no longer obtainable from standard distribution channels.

Substiute Parts

SN74LS125ANS

Texas InstrumentsIn Stock: 7889SN74LS125ANS Datasheet

Current PartRFQ

SN74LS125ANSR

Texas InstrumentsIn Stock: 5976SN74LS125ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS125ANS is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic Type: Buffer, Non-Inverting
• Number of Elements: 4
• Number of Bits per Element: 1
• Output Type: 3-State

Electrical Parameters:

• Current - Output High: 2.6 mA
• Current - Output Low: 24 mA
• Voltage - Supply: 4.75V ~ 5.25V
• Operating Temperature: 0°C ~ 70°C (TA)

Physical Parameters:

• Package / Case: 14-SOIC (0.209", 5.30mm Width)
• Mounting Type: Surface Mount

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute part SN74LS125ANSR maintains identical functional, electrical, and physical specifications. The primary distinction is the packaging format: the substitute is supplied in Tape & Reel (TR) configuration, whereas the original part number does not specify a packaging format. Both parts share the same base product number (74LS125) and are manufactured by Texas Instruments.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS125ANSR is a direct functional and electrical equivalent to the SN74LS125ANS. Selection between these parts should be based on the following criteria:

Product Status Consideration: The SN74LS125ANS carries a Last Time Buy status, indicating limited future availability. The SN74LS125ANSR maintains Active product status with Texas Instruments, ensuring continued supply and support for long-term production requirements.

Compliance and Certification: Both parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL) ratings, satisfying equivalent environmental and regulatory requirements for industrial and commercial applications.

Packaging and Supply Chain: The SN74LS125ANSR is supplied in Tape & Reel (TR) format, which is the standard packaging configuration for high-volume automated assembly operations. This format provides advantages in pick-and-place manufacturing processes and reduces handling costs in production environments.

Electrical and Functional Equivalence: All critical electrical parameters, including supply voltage range (4.75V ~ 5.25V), output current specifications (2.6 mA high, 24 mA low), and operating temperature range (0°C ~ 70°C), are identical between both parts. The functional architecture—4-element non-inverting buffer with 3-state output—remains unchanged.

For new designs and production planning, the SN74LS125ANSR is the recommended selection due to its Active product status and standard Tape & Reel packaging format.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS125ANSR be used as a direct replacement for the SN74LS125ANS in existing designs?

A: Yes. The SN74LS125ANSR is electrically and functionally identical to the SN74LS125ANS. Both parts share the same 14-SOIC package dimensions, pin configuration, electrical specifications, and operating characteristics. The parts are pin-for-pin compatible and require no circuit modifications.

Q: What is the difference between the SN74LS125ANS and SN74LS125ANSR?

A: The primary difference is the packaging format. The SN74LS125ANSR is supplied in Tape & Reel (TR) configuration, which is standard for automated assembly. The SN74LS125ANS does not specify a packaging format. Both parts are manufactured by Texas Instruments and contain identical die and electrical specifications.

Q: Why is the SN74LS125ANS marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has announced the discontinuation of this part number. Customers requiring this component should transition to the SN74LS125ANSR, which maintains Active status and ensures continued availability.

Q: Are there any differences in RoHS compliance between these parts?

A: No. Both the SN74LS125ANS and SN74LS125ANSR are ROHS3 compliant and carry identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited). They meet equivalent environmental and regulatory standards.

Q: Can the SN74LS125ANSR be used in applications requiring the original SN74LS125ANS?

A: Yes. The SN74LS125ANSR is a direct substitute for all applications using the SN74LS125ANS. The electrical performance, output drive capability (2.6 mA high, 24 mA low), supply voltage range (4.75V ~ 5.25V), and operating temperature range (0°C ~ 70°C) are identical. No design changes are required.

Q: What is the 14-SOIC package specification?

A: The 14-SOIC (Small Outline Integrated Circuit) package is a surface-mount package with 14 pins, measuring 0.209 inches (5.30mm) in width. This is a standard package for logic integrated circuits and is compatible with automated pick-and-place assembly equipment.

Q: Is the SN74LS125ANSR suitable for high-volume production?

A: Yes. The SN74LS125ANSR is supplied in Tape & Reel (TR) format, which is the standard packaging configuration for high-volume automated manufacturing. This format is optimized for pick-and-place assembly processes and provides cost efficiency in production environments.