SN74LVC126ARGYRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC126ARGYRG4 is a non-inverting buffer IC manufactured by Texas Instruments, featuring 4 elements with 1 bit per element and 3-state output capability. Designed for low-voltage logic applications, this device operates across a supply voltage range of 1.65V to 3.6V and is housed in a 14-VQFN package with exposed pad. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives to maintain design continuity and ensure component availability for production and repair applications.

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	24mA, 24mA
Voltage - Supply	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	14-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LVC126ARGYRG4 is determined by strict equivalence across the following critical parameters: logic type (non-inverting buffer), element count (4), bits per element (1), output configuration (3-state), output current capability (24mA high and low), supply voltage range (1.65V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and surface mount capability. Package variations within the 14-VFQFN family with exposed pad are permissible provided mechanical and electrical compatibility is maintained. All identified substitutes meet these core requirements while differing in packaging format, manufacturer, or product status.

Parameter Comparison

Parameter	SN74LVC126ARGYRG4	SN74LVC126ARGYR	74ALVC125BQ,115	74ALVC125BQ-Q100X
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4
Number of Bits per Element	1	1	1	1
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-VFQFN Exposed Pad	14-VFQFN Exposed Pad	14-VFQFN Exposed Pad	14-VFQFN Exposed Pad
Supplier Device Package	14-VQFN (4.6x4.6)	14-VQFN (4.6x4.6)	14-DHVQFN (2.5x3)	14-DHVQFN (2.5x3)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)
Grade	Standard	Standard	Standard	Automotive
Qualification	—	—	—	AEC-Q100

Engineering Selection Recommendations

SN74LVC126ARGYR is the primary direct substitute, manufactured by Texas Instruments with identical electrical specifications and active product status. This part maintains the original 14-VQFN (4.6x4.6) package footprint and is available in Tape & Reel packaging format.

74ALVC125BQ,115 and 74ALVC125BQ-Q100X are parametric equivalents manufactured by Nexperia USA Inc. Both parts satisfy all core electrical requirements but employ a different package variant (14-DHVQFN 2.5x3) with reduced footprint dimensions. These parts feature improved moisture sensitivity characteristics (MSL 1 versus MSL 2) and are actively produced. The 74ALVC125BQ-Q100X variant includes automotive-grade qualification (AEC-Q100), suitable for applications requiring automotive compliance.

Selection between these substitutes depends on PCB layout constraints and application requirements. Direct footprint compatibility is maintained with SN74LVC126ARGYR. Alternative footprint accommodation is required for Nexperia variants, though their superior moisture handling and active production status provide long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC126ARGYR be used as a direct replacement for SN74LVC126ARGYRG4?

A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications, operating parameters, and package designation. The primary difference is packaging format (Tape & Reel versus bulk). PCB layout and assembly processes remain unchanged.

Q: What are the key differences between Texas Instruments and Nexperia substitutes?

A: Texas Instruments SN74LVC126ARGYR maintains the original 14-VQFN (4.6x4.6) package. Nexperia 74ALVC125BQ variants use a smaller 14-DHVQFN (2.5x3) package footprint. All three parts meet identical electrical specifications. Nexperia parts feature superior moisture sensitivity (MSL 1 versus MSL 2) and active production status.

Q: Are package dimension differences between 14-VQFN (4.6x4.6) and 14-DHVQFN (2.5x3) significant?

A: Yes. The 14-DHVQFN package is physically smaller. PCB layout modifications are required for Nexperia substitutes. Verify land pattern compatibility with your design before implementation.

Q: What does AEC-Q100 qualification mean for the 74ALVC125BQ-Q100X?

A: AEC-Q100 is an automotive industry qualification standard. The 74ALVC125BQ-Q100X meets automotive-grade reliability and testing requirements. Select this variant only if your application requires automotive compliance.

Q: Why is the original SN74LVC126ARGYRG4 discontinued?

A: Product discontinuation is determined by manufacturer lifecycle decisions. Active alternatives with equivalent electrical performance are available from both Texas Instruments and Nexperia.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance, matching the original part's environmental standards.

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