74LCX126MTC Equivalent & Substitute Parts

Part Overview

The 74LCX126MTC is a non-inverting buffer IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This device operates across a 2V to 3.6V supply voltage range and is housed in a 14-TSSOP surface mount package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX126MTC
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	24mA, 24mA
Voltage - Supply	2V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LCX126MTC is determined by the following critical parameters:

Functional Equivalence: Logic type (Buffer, Non-Inverting), number of elements (4), bits per element (1), and output type (3-State) must remain constant.

Electrical Compatibility: Output current capability (24mA minimum for both high and low states), supply voltage range, and operating temperature range define the operational envelope.

Physical Compatibility: Package type (14-TSSOP preferred for direct replacement) and mounting type (Surface Mount) ensure PCB-level compatibility.

Compliance Requirements: RoHS3 compliance and MSL rating (1) are mandatory for production environments.

Substitute parts are categorized as:

Parametric Equivalents: Identical functional and electrical specifications with active product status
Direct Manufacturers: Parts listed in the original substitutes field with confirmed compatibility
Similar Parts: Functionally equivalent with extended supply voltage ranges or enhanced temperature ratings, suitable for designs with broader operational requirements

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS
74LCX126MTC	onsemi	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	2V ~ 3.6V	-40°C ~ 85°C	14-TSSOP	Obsolete	ROHS3
74LCX125MTC	Fairchild Semiconductor	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	2V ~ 3.6V	-40°C ~ 85°C	14-TSSOP	Active	ROHS3
MC74LCX125DTG	onsemi	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	2V ~ 3.6V	-40°C ~ 85°C	14-TSSOP	Active	ROHS3
74LVC126AT14-13	Diodes Incorporated	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.65V ~ 5.5V	-40°C ~ 125°C	14-TSSOP	Active	ROHS3
74LVC126APW,118	Nexperia USA Inc.	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.2V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	ROHS3
74LVC126APW-Q100J	Nexperia USA Inc.	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.2V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	ROHS3
CLVC126AQPWRG4Q1	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	ROHS3
SN74LVC126ADBR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.65V ~ 3.6V	-40°C ~ 125°C	14-SSOP	Active	ROHS3
SN74LVC126ADGVR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.65V ~ 3.6V	-40°C ~ 125°C	14-TVSOP	Active	ROHS3
SN74LVC126APW	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	ROHS3
SN74LVC126APWR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24, 24	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents):

74LCX125MTC (Fairchild Semiconductor) and MC74LCX125DTG (onsemi) provide direct functional replacement with identical electrical specifications and 14-TSSOP packaging. Both maintain the 2V to 3.6V supply voltage range and -40°C to 85°C operating temperature of the original part. MC74LCX125DTG offers the advantage of active product status and onsemi manufacturer continuity.

Extended Range Alternatives:

74LVC126AT14-13 (Diodes Incorporated), 74LVC126APW,118 (Nexperia), 74LVC126APW-Q100J (Nexperia), CLVC126AQPWRG4Q1 (Texas Instruments), SN74LVC126ADBR (Texas Instruments), SN74LVC126ADGVR (Texas Instruments), SN74LVC126APW (Texas Instruments), and SN74LVC126APWR (Texas Instruments) all provide extended supply voltage ranges (1.2V to 5.5V) and enhanced operating temperature ranges (-40°C to 125°C). These parts are suitable for designs requiring broader operational envelopes while maintaining functional equivalence.

Packaging Considerations:

SN74LVC126ADBR uses 14-SSOP packaging (0.209" width) instead of 14-TSSOP, requiring PCB layout verification. SN74LVC126ADGVR uses 14-TVSOP packaging, also requiring footprint confirmation. All other substitutes maintain the 14-TSSOP package for direct PCB compatibility.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and MSL rating of 1. All listed alternatives are currently in active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can 74LVC126 series parts directly replace 74LCX126MTC?

A: Yes. The 74LVC126 series maintains identical functional specifications (4-element non-inverting buffer with 3-state output, 24mA output current, 14-TSSOP package). The 74LVC designation indicates enhanced voltage and temperature ratings, making these parts backward compatible with 74LCX126MTC designs operating within the original 2V to 3.6V and -40°C to 85°C specifications.

Q: What is the difference between 74LCX and 74LVC logic families?

A: Both are low-voltage CMOS buffer families. 74LCX operates at 2V to 3.6V supply voltage with -40°C to 85°C temperature range. 74LVC extends these ranges to 1.2V to 5.5V supply voltage and -40°C to 125°C temperature range, providing greater design flexibility for mixed-voltage systems and extended temperature applications.

Q: Are package variants (TSSOP, SSOP, TVSOP) interchangeable?

A: No. While all variants maintain the same pin count and functional specifications, physical package dimensions differ. TSSOP (0.173" width), SSOP (0.209" width), and TVSOP packages require different PCB footprints. Verify PCB layout compatibility before substituting package variants.

Q: Does the 74LVC126APW-Q100J automotive qualification affect general industrial use?

A: No. AEC-Q100 qualification indicates the part meets automotive reliability standards and is suitable for automotive applications. This qualification does not restrict use in industrial or consumer applications; it only confirms additional testing and quality assurance.

Q: What inventory considerations apply when selecting substitutes?

A: MC74LCX125DTG (4681 pcs), SN74LVC126APWR (24300 pcs), and 74LVC126APW,118 (5326 pcs) offer the highest stock levels, providing supply chain security for production requirements. Parametric equivalents 74LCX125MTC (1535 pcs) and 74LVC126AT14-13 (2778 pcs) provide adequate inventory for most applications.

Q: Can I use 74LVC126 parts in designs originally specified for 74LCX126MTC without circuit modification?

A: Yes, provided your design operates within the original 74LCX126MTC specifications (2V to 3.6V supply, -40°C to 85°C temperature). The extended ratings of 74LVC parts do not affect operation at lower voltage and temperature ranges. No circuit modifications are required for functional compatibility.

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