SN74LVC126APWRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC126APWRG4 is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 4 elements with 1 bit per element and 3-state output capability. The device operates across a supply voltage range of 1.65V to 3.6V and is housed in a 14-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design requirements and production continuity. Substitute parts maintain identical electrical performance and mechanical compatibility while offering active product status and improved availability.

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 ~ 125°C (TA)
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: logic type (buffer, non-inverting), number of elements (4), bits per element (1), output type (3-state), output current capability (24mA high and low), supply voltage range (1.65V ~ 3.6V minimum), operating temperature range (-40°C ~ 125°C minimum), package type (14-TSSOP), and mounting method (surface mount). All substitute parts listed maintain these specifications without deviation. Packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Discontinued) do not affect electrical or mechanical substitutability. Automotive-grade variants with AEC-Q100 qualification are included as they meet or exceed standard commercial specifications.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Elements	Output Type	Supply Voltage	Operating Temp	Package	Product Status	Inventory (Pcs)
SN74LVC126APWRG4	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Discontinued	1900
SN74LVC126APWR	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	24300
CLVC125AQPWRG4Q1	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	1744
CLVC126AQPWRG4Q1	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	1322
SN74LVC125APWR	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	56300
SN74LVC125APWRE4	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Discontinued	2173
SN74LVC125APWRG3	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	4761
SN74LVC125APWT	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	6453
SN74LVC125AQPWRQ1	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	6300
SN74LVC126APWT	Texas Instruments	74LVC	Buffer, Non-Inverting	4 x 1-bit	3-State	1.65V ~ 3.6V	-40°C ~ 125°C	14-TSSOP	Active	3100
74LCX126MTCX	Fairchild Semiconductor	74LCX	Buffer, Non-Inverting	4 x 1-bit	3-State	2V ~ 3.6V	-40°C ~ 85°C	14-TSSOP	Active	33302

Engineering Selection Recommendations

For direct replacement with maximum compatibility and availability, SN74LVC126APWR is the primary substitute. This part maintains identical electrical specifications and 14-TSSOP packaging while offering active product status and significantly higher inventory (24,300 units). The packaging format difference (Tape & Reel vs. Cut Tape) does not affect circuit performance.

SN74LVC125APWR and SN74LVC125APWT are functionally equivalent alternatives with the same electrical characteristics and operating parameters. These parts offer the highest inventory availability (56,300 and 6,453 units respectively) and confirmed active status.

Automotive-grade variants CLVC125AQPWRG4Q1, CLVC126AQPWRG4Q1, and SN74LVC125AQPWRQ1 are suitable for applications requiring AEC-Q100 qualification. These parts meet all standard commercial specifications and provide additional reliability assurance for automotive environments.

The 74LCX126MTCX from Fairchild Semiconductor is a cross-manufacturer substitute with identical logic configuration and output characteristics. However, the supply voltage range is restricted to 2V ~ 3.6V (versus 1.65V ~ 3.6V) and the operating temperature range is limited to -40°C ~ 85°C (versus -40°C ~ 125°C). This part is suitable only for applications operating within these narrower specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC125 series parts replace SN74LVC126 series parts?

A: Yes. Both series maintain identical logic type (buffer, non-inverting), element count (4), bit configuration (1 bit per element), output type (3-state), output current (24mA), supply voltage range (1.65V ~ 3.6V), operating temperature (-40°C ~ 125°C), and 14-TSSOP package. The series designation difference does not affect electrical or mechanical compatibility.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are packaging formats only. Both contain identical die and electrical specifications. Cut Tape is supplied in smaller quantities on individual tape segments, while Tape & Reel is supplied in continuous reel format for automated assembly. Circuit performance is identical regardless of packaging format.

Q: Can the 74LCX126MTCX be used in all applications where SN74LVC126APWRG4 is specified?

A: The 74LCX126MTCX is suitable only for applications operating within its narrower specifications: supply voltage 2V ~ 3.6V (not 1.65V) and operating temperature -40°C ~ 85°C (not 125°C). Applications requiring the full 1.65V minimum supply voltage or 125°C maximum operating temperature must use Texas Instruments 74LVC series parts.

Q: Are automotive-grade variants (CLVC125AQPWRG4Q1, CLVC126AQPWRG4Q1, SN74LVC125AQPWRQ1) suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q100 qualification meet or exceed standard commercial specifications. These parts are fully compatible with non-automotive designs and provide additional reliability assurance.

Q: What is the primary reason for substituting the discontinued SN74LVC126APWRG4?

A: The SN74LVC126APWRG4 is discontinued at DiGi Electronics. Substitute parts maintain identical electrical performance and mechanical compatibility while offering active product status and improved long-term availability for production continuity.

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