SN74LVC126APWG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC126APWG4 is a non-inverting buffer IC with 4 elements, 1 bit per element, and 3-state output capability. Manufactured by Texas Instruments in 14-TSSOP surface mount packaging, this logic component operates across a 1.65V to 3.6V supply voltage range with ±24mA output current capability. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines to maintain design continuity and ensure supply chain 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

Substitute Part Grouping Explanation

Substitute parts for the SN74LVC126APWG4 are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

Logic type: Buffer, Non-Inverting
Element count: 4 elements
Bits per element: 1
Output configuration: 3-State
Output current: 24mA (both high and low)
Package: 14-TSSOP surface mount
Supply voltage range: Minimum 1.65V, maximum 3.6V or higher
Operating temperature: -40°C to 125°C or wider

Parts are grouped into two categories:

Manufacturer Recommended (Direct Replacement): Parts with identical or superior electrical specifications and active product status from the same or equivalent manufacturer series.

Parametric Equivalent: Parts meeting all critical electrical and mechanical parameters with minor variations in supply voltage range or manufacturer, suitable for applications where the extended specifications provide additional design margin.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Supply Voltage	Output Current (mA)	Operating Temp (°C)	Package	Inventory
SN74LVC126APWG4	Texas Instruments	74LVC	Discontinued	1.65V ~ 3.6V	24, 24	-40 ~ 125	14-TSSOP	795 Pcs
SN74LVC126APW	Texas Instruments	74LVC	Active	1.65V ~ 3.6V	24, 24	-40 ~ 125	14-TSSOP	2200 Pcs
SN74LVC125APW	Texas Instruments	74LVC	Active	1.65V ~ 3.6V	24, 24	-40 ~ 125	14-TSSOP	2388 Pcs
74LCX126MTCX	Fairchild Semiconductor	74LCX	Active	2V ~ 3.6V	24, 24	-40 ~ 85	14-TSSOP	33302 Pcs
74LVC126APW,118	Nexperia USA Inc.	74LVC	Active	1.2V ~ 3.6V	24, 24	-40 ~ 125	14-TSSOP	5326 Pcs
74LVC126AT14-13	Diodes Incorporated	74LVC	Active	1.65V ~ 5.5V	24, 24	-40 ~ 125	14-TSSOP	2778 Pcs

Engineering Selection Recommendations

Primary Recommendation: SN74LVC126APW (Texas Instruments)

The SN74LVC126APW is the direct manufacturer-recommended substitute. It maintains identical electrical specifications to the original SN74LVC126APWG4, including supply voltage range (1.65V ~ 3.6V), output current (24mA), and operating temperature range (-40°C ~ 125°C). The part is in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Inventory availability is 2200 units. This part requires no design modifications and provides the highest compatibility assurance.

Secondary Recommendation: 74LVC126APW,118 (Nexperia USA Inc.)

The 74LVC126APW,118 offers extended lower supply voltage capability (1.2V minimum) while maintaining all other critical parameters. It is ROHS3 compliant with active product status and 5326 units in stock. This part is suitable for applications requiring operation below 1.65V or where additional supply voltage margin is beneficial.

Alternative Recommendation: 74LVC126AT14-13 (Diodes Incorporated)

The 74LVC126AT14-13 provides extended upper supply voltage capability (5.5V maximum) compared to the original specification (3.6V maximum). It maintains the full operating temperature range (-40°C ~ 125°C) and is ROHS3 compliant with active status. This part is appropriate for designs requiring higher voltage tolerance or where supply voltage margin above 3.6V is necessary.

Consideration: 74LCX126MTCX (Fairchild Semiconductor)

The 74LCX126MTCX meets all critical electrical and mechanical parameters with the exception of operating temperature range, which is limited to -40°C ~ 85°C (versus -40°C ~ 125°C for the original). This part is suitable only for applications where the maximum operating temperature requirement does not exceed 85°C. Inventory availability is high at 33302 units.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC126APW be used as a direct drop-in replacement for SN74LVC126APWG4?

A: Yes. The SN74LVC126APW is electrically and mechanically identical to the SN74LVC126APWG4. Both parts share the same supply voltage range (1.65V ~ 3.6V), output current specifications (24mA), operating temperature range (-40°C ~ 125°C), and 14-TSSOP package. No circuit modifications are required.

Q: What is the difference between SN74LVC126APW and SN74LVC125APW?

A: Both parts are non-inverting buffers with 4 elements, 1 bit per element, and 3-state output in 14-TSSOP packaging. The primary difference is in the base product number (74LVC126 versus 74LVC125), indicating different internal logic configurations. Both meet the electrical specifications of the original part and are suitable substitutes.

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

A: The 74LCX126MTCX operates within the -40°C ~ 85°C range, which is narrower than the original -40°C ~ 125°C specification. This part is from the 74LCX series (Fairchild Semiconductor) rather than the 74LVC series (Texas Instruments). It is suitable only for applications where the maximum ambient temperature does not exceed 85°C.

Q: Can I use 74LVC126AT14-13 in a design originally specified for SN74LVC126APWG4?

A: Yes, with consideration of the extended supply voltage range. The 74LVC126AT14-13 supports 1.65V ~ 5.5V (versus 1.65V ~ 3.6V for the original), providing additional upper voltage margin. All other parameters, including output current, element count, and operating temperature range, are identical or superior. This part is suitable for designs requiring higher supply voltage tolerance.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts (SN74LVC126APW, SN74LVC125APW, 74LVC126APW,118, and 74LVC126AT14-13) are ROHS3 compliant. The 74LCX126MTCX compliance status is not specified in the provided data.

Q: What packaging options are available for these substitutes?

A: All substitute parts are available in 14-TSSOP surface mount packaging. Packaging formats vary by supplier: SN74LVC126APW is available in Tube; 74LCX126MTCX in Bulk; 74LVC126APW,118 and 74LVC126AT14-13 in Tape & Reel (TR).

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