74ABT126CSJX Equivalent & Substitute Parts

Part Overview

The 74ABT126CSJX is a non-inverting buffer IC with 4 elements, 1 bit per element, and 3-state output capability. Manufactured by onsemi in a 14-SOP package, this component is classified as obsolete. Due to its obsolete status, identifying functionally equivalent and mechanically compatible substitute parts is essential for design continuity and procurement flexibility. Substitute parts maintain identical electrical specifications while offering active product status from alternative manufacturers.

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
Series	74ABT
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

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)
Series: 74ABT
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Package Considerations: Substitute parts are grouped by package type. The 74ABT126CSJX uses a 14-SOP package (0.209", 5.30mm Width). Substitutes with identical package dimensions are direct mechanical replacements. Substitutes with different package dimensions (14-SOIC, 0.154", 3.90mm Width) require PCB layout verification but maintain electrical equivalence.

All substitute parts listed maintain identical electrical specifications and operating characteristics as the main part.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Type	I(out) High / Low	Supply Voltage	Temp Range	Package / Case	Product Status
74ABT126CSJX	onsemi	Buffer, Non-Inverting	4 x 1-bit	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.209", 5.30mm)	Obsolete
74ABT126D,623	Nexperia USA Inc.	Buffer, Non-Inverting	4 x 1-bit	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm)	Active
SN74ABT126D	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm)	Active
SN74ABT126DR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.154", 3.90mm)	Active
SN74ABT125NSR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.209", 5.30mm)	Active
SN74ABT126NSR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	32mA / 64mA	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC (0.209", 5.30mm)	Active

Engineering Selection Recommendations

Direct Package Match (14-SOIC, 0.209", 5.30mm Width): SN74ABT125NSR and SN74ABT126NSR are mechanically and electrically equivalent to the 74ABT126CSJX. Both parts are manufactured by Texas Instruments with active product status and ROHS3 compliance. These parts require no PCB layout modifications and provide the highest compatibility level.

Alternative Package (14-SOIC, 0.154", 3.90mm Width): 74ABT126D,623 (Nexperia USA Inc.), SN74ABT126D, and SN74ABT126DR (Texas Instruments) maintain full electrical equivalence but use a narrower 14-SOIC package. These parts are active products with ROHS3 compliance. PCB layout verification is required due to package dimension differences.

Compliance Status: All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The main part (74ABT126CSJX) is classified as obsolete; substitution with active products is recommended for new designs and ongoing procurement.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT126D replace 74ABT126CSJX directly on the PCB? A: SN74ABT126D is electrically equivalent but uses a different package footprint (14-SOIC, 0.154", 3.90mm Width versus 0.209", 5.30mm Width). PCB layout verification is required. For direct footprint compatibility, use SN74ABT126NSR or SN74ABT125NSR.

Q: What is the difference between 74ABT126 and 74ABT125? A: Both are 4-element, 1-bit non-inverting buffers with 3-state outputs and identical electrical specifications. The part numbers differ by manufacturer designation. SN74ABT125NSR is functionally equivalent to the 74ABT126CSJX for this application.

Q: Are all substitute parts ROHS3 compliant? A: All substitute parts listed are ROHS3 compliant. The main part (74ABT126CSJX) has not been evaluated for ROHS status due to its obsolete classification.

Q: Which substitute part has the highest inventory availability? A: SN74ABT126D (Texas Instruments) has 2100 pieces in stock, followed by SN74ABT126DR with 2200 pieces. Both are active products with reliable supply.

Q: Can I use these parts interchangeably in my circuit? A: All substitute parts maintain identical electrical specifications (voltage, current, temperature range, logic function). Interchangeability depends on package compatibility with your PCB design. Verify package dimensions before selection.

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