74HC126DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC126DB,112 is a non-inverting buffer IC manufactured by Nexperia USA Inc., designed for logic-level signal buffering with 3-state output capability. This component features 4 buffer elements, each with 1-bit per element configuration, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HC126DB,112
Manufacturer	Nexperia USA Inc.
Series	74HC
Logic Type	Buffer, Non-Inverting
Number of Elements	4
Number of Bits per Element	1
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	14-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74HC126DB,112 are classified into two categories based on allowed electrical and mechanical parameters:

Direct Manufacturer Substitutes maintain identical package type (14-SSOP), electrical specifications, and functional characteristics. These parts are pin-compatible and require no circuit board modifications.

Similar Manufacturer Substitutes share identical electrical specifications and functional characteristics but utilize alternative package types (14-TSSOP) or different manufacturers within the 74HC series. These parts require PCB layout adjustments due to package footprint differences.

Parametric Equivalents share the same base product number series (74HC125) with identical electrical performance parameters but represent a different logic function variant. These are functionally equivalent for applications requiring non-inverting buffer operation with 3-state output.

Key parameters determining substitution eligibility:

Logic Type: Buffer, Non-Inverting
Number of Elements: 4
Number of Bits per Element: 1
Output Type: 3-State
Current - Output High, Low: 7.8mA, 7.8mA
Voltage - Supply: 2V ~ 6V
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Parameter Comparison

Parameter	74HC126DB,112 (Main)	SN74HC126DBR	MM74HC126MTCX	SN74HC126APWR	SN74HC126PW	SN74HC126PWR	SN74HC126PWT	74HC125DB,112
Manufacturer	Nexperia USA Inc.	Texas Instruments	Fairchild Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	NXP USA Inc.
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	4	4	4	4	4	4	4	4
Number of Bits per Element	1	1	1	1	1	1	1	1
Output Type	3-State	3-State	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	14-SSOP (0.209", 5.30mm)	14-SSOP (0.209", 5.30mm)	14-TSSOP (0.173", 4.40mm)	14-TSSOP (0.173", 4.40mm)	14-TSSOP (0.173", 4.40mm)	14-TSSOP (0.173", 4.40mm)	14-TSSOP (0.173", 4.40mm)	14-SSOP (0.209", 5.30mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Discontinued at DiGi Electronics	Active	Discontinued at DiGi Electronics	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (14-SSOP Package):

SN74HC126DBR from Texas Instruments is the primary direct substitute. This part maintains identical package footprint, electrical specifications, and functional characteristics. The part is currently active in production, ensuring long-term availability. Operating temperature range is reduced to -40°C ~ 85°C compared to the original -40°C ~ 125°C specification.

74HC125DB,112 from NXP USA Inc. serves as a parametric equivalent with identical package type and extended operating temperature range (-40°C ~ 125°C). Both parts maintain ROHS3 compliance and MSL Level 1 rating.

For Alternative Package Configurations (14-TSSOP Package):

SN74HC126APWR, SN74HC126PWR, and SN74HC126PWT from Texas Instruments provide active or recently discontinued alternatives with 14-TSSOP packaging. These parts require PCB layout modifications due to reduced package width (0.173" versus 0.209"). All maintain identical electrical specifications and ROHS3 compliance.

MM74HC126MTCX from Fairchild Semiconductor offers similar electrical performance in 14-TSSOP package with bulk packaging option. RoHS and MSL status are not specified for this part.

Compliance and Certification Basis:

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with modern manufacturing and storage requirements. Parts with active product status provide superior long-term procurement reliability compared to discontinued or obsolete alternatives.

Frequently Asked Questions (FAQ)

Q: Can SN74HC126DBR be used as a direct replacement for 74HC126DB,112?

A: Yes. SN74HC126DBR maintains identical package type (14-SSOP), pin configuration, electrical specifications, and functional characteristics. No circuit board modifications are required. The operating temperature range is reduced from -40°C ~ 125°C to -40°C ~ 85°C, which must be evaluated against application requirements.

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

A: Both are 14-pin surface mount packages with different physical dimensions. The 14-SSOP has a width of 0.209" (5.30mm), while the 14-TSSOP has a width of 0.173" (4.40mm). Substituting between these packages requires PCB footprint redesign and cannot be performed as a direct drop-in replacement.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitutes except MM74HC126MTCX explicitly state ROHS3 compliance. MM74HC126MTCX does not specify RoHS status in the provided data. Compliance verification with the manufacturer is recommended before selection.

Q: What is the significance of MSL Level 1 rating?

A: MSL Level 1 indicates unlimited shelf life without moisture baking requirements. All listed parts maintain this rating, ensuring consistent handling and storage procedures across substitutes.

Q: Can 74HC125DB,112 replace 74HC126DB,112 functionally?

A: Both parts share identical electrical specifications, element count, output type, and package configuration. The base product numbers differ (74HC125 versus 74HC126), indicating different logic function variants. Functional compatibility depends on circuit design requirements and must be verified against application schematics.

Q: Which substitute offers the best long-term availability?

A: SN74HC126DBR and SN74HC126PWR from Texas Instruments are listed as active products, providing superior long-term procurement reliability. SN74HC126PW and SN74HC126PWT are discontinued at DiGi Electronics, limiting future availability.

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