CD74HCT126M Equivalent & Substitute Parts

Part Overview

The CD74HCT126M is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 4 elements with 3-state output capability in a 14-SOIC surface mount package. This device is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The 74HCT126 series provides standardized buffer functionality across multiple manufacturers, enabling direct substitution based on electrical and mechanical compatibility.

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, Low	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Base Product Number	74HCT126

Substitute Part Grouping Explanation

Substitution of the CD74HCT126M is determined by the following critical parameters:

Logic Function: All substitute parts must implement Buffer, Non-Inverting logic with 4 elements, 1 bit per element, and 3-state output
Electrical Specifications: Supply voltage range 4.5V ~ 5.5V and output current capability (6mA minimum for primary substitutes)
Package Compatibility: 14-SOIC surface mount package with 0.154" (3.90mm) width
Base Product Number: 74HCT126 series designation ensures functional equivalence

Substitute parts are grouped by manufacturer and packaging format while maintaining identical functional and electrical characteristics. Variations in product status, operating temperature range, and output current specifications are noted for application-specific selection.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements	Output Type	Current (mA)	Voltage Supply	Temp Range	Package	Packaging Format
CD74HCT126M	Texas Instruments	Discontinued	Buffer, Non-Inverting	4	3-State	6, 6	4.5V ~ 5.5V	-55°C ~ 125°C	14-SOIC	Tube
CD74HCT126M96	Texas Instruments	Active	Buffer, Non-Inverting	4	3-State	6, 6	4.5V ~ 5.5V	-55°C ~ 125°C	14-SOIC	Cut Tape & Digi-Reel
CD74HCT125M	Harris Corporation	Obsolete	Buffer, Non-Inverting	4	3-State	6, 6	4.5V ~ 5.5V	-55°C ~ 125°C	14-SOIC	Tube
74HCT126D,653	NXP Semiconductors	Active	Buffer, Non-Inverting	4	3-State	6, 6	4.5V ~ 5.5V	-40°C ~ 125°C	14-SOIC	Bulk
74HCT126D-Q100J	Nexperia USA Inc.	Active	Buffer, Non-Inverting	4	3-State	6, 6	4.5V ~ 5.5V	-40°C ~ 125°C	14-SOIC	Tape & Reel
74HCT126S14-13	Diodes Incorporated	Active	Buffer, Non-Inverting	4	3-State	4, 4	4.5V ~ 5.5V	-40°C ~ 125°C	14-SOIC	Tape & Reel

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): CD74HCT126M96 from Texas Instruments is the direct equivalent, maintaining identical electrical specifications and operating temperature range while offering active product status and alternative packaging (Cut Tape & Digi-Reel).

Active Alternatives: 74HCT126D,653 (NXP Semiconductors) and 74HCT126D-Q100J (Nexperia USA Inc.) provide active product status with full functional equivalence. Both support the extended operating temperature range (-40°C ~ 125°C) and maintain 6mA output current specifications. The 74HCT126D-Q100J includes AEC-Q100 automotive qualification and ROHS3 compliance.

Reduced Output Current Option: 74HCT126S14-13 from Diodes Incorporated is functionally equivalent with reduced output current (4mA vs. 6mA). This part is suitable for applications where lower drive capability is acceptable.

Obsolete Alternatives: CD74HCT125M (Harris Corporation) and CD74HCT126M96 maintain full electrical compatibility but carry obsolete or discontinued status, limiting long-term availability.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT126M96 directly replace CD74HCT126M? A: Yes. CD74HCT126M96 is the direct equivalent from Texas Instruments with identical electrical specifications, logic function, and operating temperature range. The difference is packaging format (Cut Tape & Digi-Reel vs. Tube) and active product status.

Q: What is the difference between 74HCT126D,653 and 74HCT126D-Q100J? A: Both are functionally equivalent 74HCT126 implementations from different manufacturers (NXP vs. Nexperia). The 74HCT126D-Q100J includes AEC-Q100 automotive qualification and is packaged in Tape & Reel format, while 74HCT126D,653 is supplied in Bulk packaging.

Q: Is 74HCT126S14-13 compatible with the original CD74HCT126M? A: 74HCT126S14-13 is functionally compatible but with reduced output current (4mA vs. 6mA). It is suitable for applications where lower drive capability meets design requirements. Verify output current requirements before substitution.

Q: Why does CD74HCT125M appear in the substitute list? A: CD74HCT125M shares identical electrical specifications and package format with CD74HCT126M. However, it carries obsolete status and is not recommended for new designs due to limited availability.

Q: What packaging formats are available for 74HCT126 substitutes? A: Available formats include Tube, Cut Tape & Digi-Reel, Tape & Reel (TR), and Bulk. Selection depends on production volume and assembly requirements. All maintain the same 14-SOIC package footprint.

Q: Are all substitutes ROHS3 compliant? A: CD74HCT126M96, 74HCT126D-Q100J, and 74HCT126S14-13 are ROHS3 compliant. CD74HCT125M is RoHS non-compliant. Verify compliance requirements for your application.

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