74ABT126CSJ Equivalent & Substitute Parts

Part Overview

The 74ABT126CSJ 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 74ABT series provides standard logic buffering functionality suitable for 4.5V to 5.5V supply voltage applications with industrial temperature range operation.

Key Parameters

Parameter	Specification
Manufacturer Part Number	74ABT126CSJ
Manufacturer	onsemi
Logic Type	Buffer, Non-Inverting
Number of Elements	4
Number of Bits per Element	1
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ABT126CSJ is determined by the following critical parameters that must remain constant across all equivalent parts:

Logic Type: Buffer, Non-Inverting
Number of Elements: 4
Number of Bits per Element: 1
Output Type: 3-State
Current - Output High, Low: 32mA, 64mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount
Base Product Number: 74ABT126 or 74ABT125

Substitute parts are grouped into two categories:

Direct Substitutes (Same Base Product Number 74ABT126): Parts that maintain identical functional specifications and differ only in packaging format or supplier designation. These include SN74ABT126D, SN74ABT126DR, SN74ABT126NSR, and 74ABT126D,623.

Parametric Equivalents (Base Product Number 74ABT125): Parts that maintain all electrical and functional parameters but use an alternative base product designation. SN74ABT125NS qualifies as a parametric equivalent with identical performance characteristics.

Parameter Comparison

Parameter	74ABT126CSJ (Main)	74ABT126D,623	SN74ABT126D	SN74ABT126DR	SN74ABT126NSR	SN74ABT125NS	SN74ABT126NS
Manufacturer	onsemi	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4	4	4	4
Number of Bits per Element	1	1	1	1	1	1	1
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA	32mA, 64mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.209", 5.30mm)	14-SOIC (0.209", 5.30mm)	14-SOIC (0.209", 5.30mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical and functional specifications to the 74ABT126CSJ. Selection among active alternatives should be based on the following factors:

Product Status: The 74ABT126CSJ is obsolete. All substitute parts listed carry active product status, ensuring long-term availability and manufacturing support.

Compliance and Certifications: All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The main part does not specify RoHS compliance status.

Package Considerations: The 74ABT126CSJ uses a 14-SOIC package with 0.209" width (5.30mm). Direct package matches are available with SN74ABT126NSR, SN74ABT125NS, and SN74ABT126NS. Alternative package options with 0.154" width (3.90mm) are available with 74ABT126D,623, SN74ABT126D, and SN74ABT126DR, which may require PCB layout adjustment.

Manufacturer Selection: Texas Instruments (SN74ABT126D, SN74ABT126DR, SN74ABT126NSR, SN74ABT125NS, SN74ABT126NS) and Nexperia USA Inc. (74ABT126D,623) are established suppliers with active product lines. Selection may depend on existing supply chain relationships and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT126D be used as a direct replacement for 74ABT126CSJ?

A: SN74ABT126D is functionally equivalent with identical electrical specifications. However, it uses a 14-SOIC package with 0.154" width (3.90mm) compared to the main part's 0.209" width (5.30mm). PCB layout compatibility must be verified before substitution.

Q: What is the difference between 74ABT126 and 74ABT125 base product numbers?

A: Both maintain identical electrical and functional parameters as specified. SN74ABT125NS qualifies as a parametric equivalent with the same performance characteristics. The base product number difference does not affect substitution eligibility based on the provided specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed carry ROHS3 compliance certification. The original 74ABT126CSJ does not specify RoHS status in the provided data.

Q: What packaging options are available for substitution?

A: Two package widths are available: 14-SOIC with 0.209" width (5.30mm) matching the original part, and 14-SOIC with 0.154" width (3.90mm) as a compact alternative. Package selection depends on PCB layout requirements and available board space.

Q: Which substitute part has the highest inventory availability?

A: SN74ABT126D from Texas Instruments has 2100 pieces in stock, followed by SN74ABT126DR with 2200 pieces. Both represent the highest available inventory among the listed substitutes.

Q: Can packaging format differences affect circuit performance?

A: All listed parts maintain identical electrical specifications regardless of package width. Packaging differences are physical only and do not affect functional performance. PCB layout and footprint compatibility must be confirmed during design integration.

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