SN74F125D Equivalent & Substitute Parts

Part Overview

The SN74F125D 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 14-SOIC surface mount device operates within a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The SN74F125D carries a Last Time Buy product status, indicating limited future availability. Identifying equivalent and substitute parts is essential for design continuity, long-term supply chain planning, and ensuring component availability for production and maintenance applications.

Substiute Parts

SN74F125D

Texas InstrumentsIn Stock: 1912SN74F125D Datasheet

Current PartRFQ

SN74F125DR

Texas InstrumentsIn Stock: 12577SN74F125DR Datasheet

MFR RecommendedRFQ

SN74BCT125AD

Texas InstrumentsIn Stock: 66112SN74BCT125AD Datasheet

Parametric EquivalentRFQ

SN74F126D

Texas InstrumentsIn Stock: 3145SN74F126D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74F125D are qualified based on strict electrical and mechanical parameter matching. All substitute candidates maintain identical functional specifications: 4-element non-inverting buffer configuration, 1 bit per element, 3-state output, 15mA/64mA output current ratings, 4.5V to 5.5V supply voltage range, 0°C to 70°C operating temperature, and 14-SOIC package footprint. Substitution eligibility is determined by these core parameters, which ensure pin-for-pin and functional compatibility. Packaging format (Tube vs. Tape & Reel) and product status (Last Time Buy vs. Active) do not affect electrical substitutability but influence supply chain considerations and long-term availability.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—SN74F125DR, SN74BCT125AD, and SN74F126D—are electrically and mechanically equivalent to the SN74F125D and satisfy identical functional requirements for non-inverting buffer applications. All parts maintain ROHS3 compliance, REACH unaffected status, and MSL Level 1 rating, ensuring regulatory and environmental compatibility.

SN74F125DR is the manufacturer-recommended substitute, offering the advantage of Active product status, which provides extended availability and supply chain stability compared to the Last Time Buy status of the SN74F125D. This part is supplied in Tape & Reel format, suitable for high-volume automated assembly processes.

SN74BCT125AD and SN74F126D are parametric equivalents with Last Time Buy status, similar to the original SN74F125D. These parts are supplied in Tube packaging format. SN74BCT125AD belongs to the 74BCT logic series, while SN74F126D belongs to the 74F series, matching the original part's series classification.

For new designs and long-term production planning, SN74F125DR is the preferred selection due to its Active status. For existing designs requiring direct replacement with identical packaging format, SN74BCT125AD and SN74F126D provide equivalent functionality.

Frequently Asked Questions (FAQ)

Q: Can SN74F125DR be used as a direct replacement for SN74F125D?

A: Yes. SN74F125DR is electrically and mechanically equivalent to SN74F125D. Both parts share identical logic type, element count, output type, current ratings, supply voltage range, operating temperature, and 14-SOIC package footprint. The primary difference is packaging format (Tape & Reel vs. Tube) and product status (Active vs. Last Time Buy).

Q: What is the difference between SN74F125D and SN74BCT125AD?

A: Both parts are parametric equivalents with identical electrical specifications and 14-SOIC package dimensions. The difference lies in the logic series designation: SN74F125D belongs to the 74F series, while SN74BCT125AD belongs to the 74BCT series. Both maintain the same functional performance for non-inverting buffer applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN74F125DR, SN74BCT125AD, and SN74F126D are all ROHS3 compliant and REACH unaffected, matching the compliance status of the original SN74F125D.

Q: Does packaging format affect electrical compatibility?

A: No. Packaging format (Tube vs. Tape & Reel) does not affect electrical compatibility or functional performance. The choice between formats depends on assembly process requirements and supply chain logistics. Tube packaging is suitable for manual assembly and lower-volume applications, while Tape & Reel format is optimized for automated high-volume production.

Q: Why is SN74F125DR recommended over other substitutes?

A: SN74F125DR carries Active product status, ensuring long-term availability and supply chain continuity. The SN74F125D and alternative substitutes SN74BCT125AD and SN74F126D are designated Last Time Buy, indicating limited future availability. For new designs and ongoing production, SN74F125DR provides superior supply security.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, provided the PCB footprint accommodates the 14-SOIC package and the assembly process is compatible with the selected packaging format. All substitute parts maintain identical pin configuration and electrical characteristics, enabling direct substitution without circuit redesign.