74ABT126CSC Equivalent & Substitute Parts

Part Overview

The 74ABT126CSC 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 operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	4
Number of Bits per Element	1
Output Type	3-State
Current - Output High	32mA
Current - Output Low	64mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ABT126CSC is determined by strict equivalence across the following critical parameters: logic type (Buffer, Non-Inverting), number of elements (4), bits per element (1), output type (3-State), output current ratings (32mA high, 64mA low), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and mounting type (Surface Mount).

Substitute parts are grouped into two categories:

Direct Substitutes (Same Base Part Number): Parts sharing the 74ABT126 base designation with identical electrical specifications and compatible packaging. These include 74ABT126D,623 (Nexperia), SN74ABT126DR (Texas Instruments), and SN74ABT126D (Texas Instruments). Packaging variations between 14-SOIC and 14-SO are mechanically compatible within the specified width tolerance.

Parametric Equivalents (Alternative Base Part Number): Parts with different base designations but identical electrical and functional parameters. SN74ABT125D (Texas Instruments) qualifies as a parametric equivalent, offering the same logic configuration and performance characteristics. SN74ABT126NSR (Texas Instruments) is also included as a direct substitute with a wider package footprint (0.209" vs 0.154" width).

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements	Output Type	Current High / Low (mA)	Supply Voltage	Temp Range	Package	RoHS Status
74ABT126CSC	onsemi	Obsolete	Buffer, Non-Inverting	4 x 1-bit	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154")	Not Specified
74ABT126D,623	Nexperia USA Inc.	Active	Buffer, Non-Inverting	4 x 1-bit	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	14-SO (0.154")	ROHS3 Compliant
SN74ABT126DR	Texas Instruments	Active	Buffer, Non-Inverting	4 x 1-bit	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154")	ROHS3 Compliant
SN74ABT126NSR	Texas Instruments	Active	Buffer, Non-Inverting	4 x 1-bit	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	14-SO (0.209")	ROHS3 Compliant
SN74ABT126D	Texas Instruments	Active	Buffer, Non-Inverting	4 x 1-bit	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154")	ROHS3 Compliant
SN74ABT125D	Texas Instruments	Active	Buffer, Non-Inverting	4 x 1-bit	3-State	32 / 64	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154")	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical specifications and functional equivalence to the 74ABT126CSC. Selection should prioritize active product status and compliance certifications.

Primary Recommendation: SN74ABT126DR (Texas Instruments) or SN74ABT126D (Texas Instruments) are preferred substitutes, offering active product status, ROHS3 compliance, and identical 14-SOIC packaging (0.154" width) matching the original part footprint. Both are available in standard packaging formats (Cut Tape & Digi-Reel or Tube).

Secondary Recommendation: 74ABT126D,623 (Nexperia USA Inc.) provides active status and ROHS3 compliance with compatible 14-SO packaging. This option is suitable where tape and reel packaging is required.

Alternative Equivalent: SN74ABT125D (Texas Instruments) offers parametric equivalence with active status and ROHS3 compliance. This part maintains identical electrical performance and 14-SOIC packaging but carries a different base part number.

Package Consideration: SN74ABT126NSR features a wider 14-SO package (0.209" width) compared to the standard 0.154" width. This part is suitable only for designs where the increased package width does not create PCB layout conflicts.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT126D directly replace 74ABT126CSC in existing designs?

A: Yes. SN74ABT126D provides direct electrical and functional equivalence with identical 14-SOIC packaging dimensions (0.154" width). No circuit modifications are required. The part is pin-compatible and maintains all specified electrical parameters.

Q: What is the difference between 74ABT126D,623 and SN74ABT126D?

A: Both parts are electrically equivalent with identical specifications. The primary difference is manufacturer (Nexperia vs. Texas Instruments) and packaging format designation (14-SO vs. 14-SOIC). Both are mechanically compatible with the original 0.154" width specification.

Q: Is SN74ABT125D a suitable replacement?

A: Yes. SN74ABT125D is a parametric equivalent offering identical logic configuration, output current ratings, supply voltage, and operating temperature range. The different base part number (125 vs. 126) does not affect functional compatibility in applications requiring 4-element, 1-bit non-inverting buffers with 3-state output.

Q: Why is SN74ABT126NSR listed if it has a different package width?

A: SN74ABT126NSR is included as a direct substitute with identical electrical specifications. However, the wider 14-SO package (0.209" width) requires verification against PCB layout constraints before selection. Use this part only when the increased width does not conflict with existing board design.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (74ABT126D,623, SN74ABT126DR, SN74ABT126NSR, SN74ABT126D, and SN74ABT125D) are ROHS3 compliant. The original 74ABT126CSC (obsolete) does not specify RoHS status.

Q: What packaging formats are available for these substitutes?

A: Substitute parts are available in multiple packaging formats: Cut Tape & Digi-Reel (SN74ABT126DR), Tape & Reel (74ABT126D,623 and SN74ABT126NSR), and Tube (SN74ABT126D and SN74ABT125D). Select based on procurement volume and assembly requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message