74LVC126ADB,112 Equivalent & Substitute Parts

Part Overview

The 74LVC126ADB,112 is a non-inverting buffer IC manufactured by Nexperia USA Inc., designed for logic-level signal buffering applications. This device features 4 elements with 1 bit per element and 3-state output capability, operating across a supply voltage range of 1.2V to 3.6V. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional equivalence in buffer operation, output drive capability, and pin configuration while meeting current availability and compliance requirements.

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	1.2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	14-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LVC126ADB,112 is determined by the following critical parameters: logic type (buffer, non-inverting), element count (4), bits per element (1), output type (3-state), output current capability (24mA high and low), and mounting type (surface mount). Package compatibility is evaluated separately, as the original part uses 14-SSOP packaging. Substitute parts are grouped into two categories based on package type: parts maintaining 14-SSOP packaging and parts using alternative 14-pin surface mount packages (14-TSSOP, 14-TVSOP) that provide functional equivalence with different footprints. All substitute parts must support the operating temperature range of -40°C to 125°C and maintain ROHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status
74LVC126ADB,112	Nexperia USA Inc.	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.2 ~ 3.6V	-40 ~ 125	14-SSOP	Obsolete
SN74LVC126ADBR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.65 ~ 3.6V	-40 ~ 125	14-SSOP	Active
SN74LVC126APWR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.65 ~ 3.6V	-40 ~ 125	14-TSSOP	Active
SN74LVC126APWT	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.65 ~ 3.6V	-40 ~ 125	14-TSSOP	Active
SN74LVC126APW	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.65 ~ 3.6V	-40 ~ 125	14-TSSOP	Active
SN74LVC126ADGVR	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.65 ~ 3.6V	-40 ~ 125	14-TVSOP	Active
CLVC126AQPWRG4Q1	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	1.65 ~ 3.6V	-40 ~ 125	14-TSSOP	Active
74LCX126MTCX	Fairchild Semiconductor	Buffer, Non-Inverting	4 x 1-bit	3-State	24/24	2.0 ~ 3.6V	-40 ~ 85	14-TSSOP	Active

Engineering Selection Recommendations

For direct footprint replacement of the obsolete 74LVC126ADB,112 in 14-SSOP packaging, the SN74LVC126ADBR from Texas Instruments is the primary selection. This part maintains identical package geometry, full operating temperature range (-40°C to 125°C), and active product status with established supply chain availability.

For applications where package migration is acceptable, the SN74LVC126APWR and SN74LVC126APWT offer superior availability (24,300 and 3,100 units respectively) in 14-TSSOP packaging. Both parts are active products with ROHS3 compliance and identical functional specifications.

The CLVC126AQPWRG4Q1 from Texas Instruments provides automotive-grade qualification (AEC-Q100) for applications requiring automotive compliance, available in 14-TSSOP packaging with 1,322 units in stock.

The 74LCX126MTCX from Fairchild Semiconductor is functionally equivalent but operates at a reduced maximum temperature of 85°C and requires minimum supply voltage of 2.0V. This part is suitable only for applications within these thermal and voltage constraints.

Frequently Asked Questions (FAQ)

Q: Can I use SN74LVC126ADBR as a direct replacement for 74LVC126ADB,112?

A: Yes. The SN74LVC126ADBR maintains identical 14-SSOP packaging, matching pin configuration and footprint. Both parts share the same buffer architecture, 4-element configuration, 3-state output, and 24mA drive capability. The SN74LVC126ADBR is an active product with established availability.

Q: What is the difference between 14-SSOP and 14-TSSOP packages?

A: Both are 14-pin surface mount packages with different body widths. The 14-SSOP (original part) has a width of 0.209" (5.30mm), while 14-TSSOP has a width of 0.173" (4.40mm). These packages are not mechanically interchangeable on the same PCB footprint. Package migration requires PCB redesign.

Q: Why does 74LCX126MTCX have a lower maximum operating temperature?

A: The 74LCX126MTCX is specified for -40°C to 85°C operation, compared to -40°C to 125°C for the 74LVC series. This reflects the device's design specifications and is not a limitation of the buffer function itself. Selection depends on application temperature requirements.

Q: Is the CLVC126AQPWRG4Q1 suitable for non-automotive applications?

A: Yes. The CLVC126AQPWRG4Q1 includes automotive qualification (AEC-Q100) but is functionally equivalent to standard 74LVC126 parts. It can be used in any application requiring the specified buffer characteristics. Automotive qualification does not restrict use in non-automotive designs.

Q: What is the minimum supply voltage difference between the original part and substitutes?

A: The 74LVC126ADB,112 operates from 1.2V minimum, while most Texas Instruments substitutes operate from 1.65V minimum. The 74LCX126MTCX requires 2.0V minimum. Applications operating below 1.65V require the original Nexperia part or equivalent 1.2V-rated alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental compliance of the original 74LVC126ADB,112.

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