74F125SCX Equivalent & Substitute Parts

Part Overview

The 74F125SCX is a non-inverting buffer logic IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 14-SOIC package format and 5.5V supply voltage specification define the core functional requirements for identifying compatible alternatives.

Substiute Parts

74F125SCX

onsemiIn Stock: 3491974F125SCX Datasheet

Current PartRFQ

SN74F125D

Texas InstrumentsIn Stock: 1912SN74F125D Datasheet

DirectRFQ

SN74F125DR

Texas InstrumentsIn Stock: 12577SN74F125DR Datasheet

DirectRFQ

SN74F125NSR

Texas InstrumentsIn Stock: 3503SN74F125NSR Datasheet

SimilarRFQ

SN74BCT125ADR

Texas InstrumentsIn Stock: 1068SN74BCT125ADR Datasheet

Parametric EquivalentRFQ

SN74F126DR

Texas InstrumentsIn Stock: 8915SN74F126DR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F125SCX are classified based on functional and physical compatibility. The primary substitution criteria are:

Direct Equivalents maintain identical logic function, pin configuration, and package dimensions (14-SOIC 0.154" width). These parts share the same base product number (74F125) or functionally equivalent series designation.

Similar Substitutes provide equivalent electrical performance but differ in package width specification (14-SO 0.209" width instead of 0.154"). These parts maintain functional compatibility but require PCB layout verification for mechanical fit.

Parametric Equivalents belong to different logic series (74BCT or 74F126) but deliver identical electrical performance across all specified parameters: 4 elements, 1 bit per element, 3-state output, 15mA/64mA output current, and 4.5V–5.5V supply voltage range.

All substitute parts maintain the same operating temperature range (0°C ~ 70°C), MSL rating (1), and supply voltage specification as the original 74F125SCX.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SN74F125DR

The SN74F125DR is the recommended direct substitute for the 74F125SCX. This Texas Instruments part maintains identical electrical specifications, package dimensions (14-SOIC 0.154" width), and logic function. The part carries Active product status with ROHS3 compliance and substantial inventory availability (12,519 pcs), ensuring long-term procurement reliability and regulatory compliance.

Secondary Selection: SN74F125D

The SN74F125D provides direct functional equivalence with identical package dimensions and electrical performance. This part is classified as Last Time Buy, indicating limited future availability. Selection of this part should be reserved for applications where inventory depletion of primary options is anticipated.

Alternative for Package Flexibility: SN74F125NSR

The SN74F125NSR delivers equivalent electrical performance with Active product status and robust inventory (3,400 pcs). The wider package format (14-SO 0.209" width) requires PCB layout verification to confirm mechanical compatibility with existing designs. This part is suitable for new designs or redesigns where package width accommodation is feasible.

Parametric Equivalent: SN74BCT125ADR

The SN74BCT125ADR belongs to the 74BCT logic series and provides identical electrical performance across all specified parameters. This part maintains the 14-SOIC 0.154" package format and Active product status. Selection is appropriate when 74F series availability is constrained, provided design documentation acknowledges the series change.

Parametric Equivalent: SN74F126DR

The SN74F126DR is a 74F126 series part with identical electrical specifications and package format (14-SOIC 0.154" width). Active product status and strong inventory (8,840 pcs) support procurement continuity. This part is suitable as a secondary alternative when primary 74F125 options are unavailable.

Frequently Asked Questions (FAQ)

Q: Can SN74F125DR be used as a direct replacement for 74F125SCX?

A: Yes. The SN74F125DR is a direct substitute with identical logic function, electrical specifications, output current ratings (15mA/64mA), supply voltage range (4.5V–5.5V), operating temperature (0°C–70°C), and package format (14-SOIC 0.154" width). No circuit modifications are required.

Q: What is the difference between SN74F125D and SN74F125DR?

A: Both parts are electrically identical. The primary difference is packaging format: SN74F125D is supplied in Tube packaging, while SN74F125DR is supplied in Tape & Reel (TR) format. SN74F125DR is recommended for production environments requiring automated assembly compatibility.

Q: Can SN74F125NSR replace 74F125SCX on existing PCBs?

A: SN74F125NSR provides equivalent electrical performance but uses a wider package format (14-SO 0.209" width versus 14-SOIC 0.154" width). Physical fit on existing PCBs must be verified. This part is suitable for new designs or PCB redesigns where the wider footprint can be accommodated.

Q: What is the difference between 74F and 74BCT series buffers?

A: Both series deliver identical electrical performance for the specified parameters (4 elements, 1 bit per element, 3-state output, 15mA/64mA output current, 4.5V–5.5V supply). The 74BCT series is a separate logic family with different internal architecture. Selection of SN74BCT125ADR is appropriate when 74F series parts are unavailable, provided design documentation reflects the series change.

Q: Why is 74F125SCX listed as obsolete?

A: The 74F125SCX is an onsemi product that has reached end-of-life status. Substitute parts from Texas Instruments (SN74F125DR, SN74F125D) or equivalent series parts (SN74BCT125ADR, SN74F126DR) provide continued design support and procurement options.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitute parts listed (SN74F125D, SN74F125DR, SN74F125NSR, SN74BCT125ADR, SN74F126DR) carry ROHS3 compliance certification. The original 74F125SCX is REACH Unaffected. Compliance requirements for your application should be verified against procurement specifications.

Q: What inventory levels should I consider for long-term supply planning?

A: SN74F125DR offers the highest inventory availability (12,519 pcs) with Active product status, supporting extended procurement windows. SN74F126DR (8,840 pcs) and SN74F125NSR (3,400 pcs) provide secondary options. SN74F125D (1,900 pcs) is Last Time Buy with limited future availability. SN74BCT125ADR (1,025 pcs) has the lowest inventory level.