SN74HC126DT Equivalent & Substitute Parts

Part Overview

The SN74HC126DT 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 2V to 6V supply voltage range and is housed in a 14-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC126DT
Manufacturer	Texas Instruments
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 ~ 85°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HC126DT is determined by the following critical parameters: logic type (non-inverting buffer), number of elements (4), output configuration (3-state), supply voltage range (2V ~ 6V), output current capability (7.8mA per output), operating temperature range, and package type (14-SOIC). Parts meeting these electrical and mechanical specifications are classified as parametric equivalents or manufacturer-recommended substitutes. Packaging format (Tape & Reel vs. Cut Tape) does not affect functional equivalence but may influence procurement and handling requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Status
SN74HC126DT	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Discontinued
SN74HC125DR	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active
SN74HC125DT	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Discontinued
SN74HC126DR	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active
74HC126D,653	Nexperia USA Inc.	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	14-SOIC	Active
74HC126S14-13	Diodes Incorporated	Buffer, Non-Inverting	4	3-State	5.2 / 5.2	2V ~ 6V	-40 ~ 125	14-SOIC	Active
MC74HC126ADG	onsemi	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Obsolete
MC74HC126ADR2G	onsemi	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active
MM74HC126M	Fairchild Semiconductor	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active
MM74HC125MX	Fairchild Semiconductor	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active
MM74HC126MX	Fairchild Semiconductor	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HC126DT, SN74HC126DR from Texas Instruments is the primary choice, offering identical electrical specifications and active product status. This part maintains the same output current capability (7.8mA), supply voltage range, and operating temperature window as the original.

When Texas Instruments parts are unavailable, MC74HC126ADR2G from onsemi provides full parametric equivalence with extended operating temperature range (-55°C to 125°C) and active status. This part is suitable for applications requiring broader temperature performance.

For cost-sensitive applications where slightly reduced output current is acceptable, 74HC126S14-13 from Diodes Incorporated delivers the same functional performance with 5.2mA output current and extended temperature range (-40°C to 125°C).

Nexperia's 74HC126D,653 and Fairchild's MM74HC126M and MM74HC126MX are functionally equivalent alternatives with active product status. All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating.

MC74HC126ADG from onsemi is obsolete and should be avoided for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74HC125DR replace SN74HC126DT? A: Yes. Both parts are non-inverting buffers with 4 elements, 3-state output, identical output current (7.8mA), and the same supply voltage and temperature operating ranges. The primary difference is base product number (74HC125 vs. 74HC126), but electrical functionality is equivalent. Verify circuit design compatibility with the specific buffer variant.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging? A: Packaging format affects procurement and handling only. Tape & Reel is supplied on continuous tape for automated assembly, while Cut Tape & Digi-Reel is supplied in smaller quantities on cut tape segments. Electrical and mechanical specifications remain identical.

Q: Why does 74HC126S14-13 have lower output current (5.2mA vs. 7.8mA)? A: Output current specifications vary by manufacturer design. The 5.2mA rating from Diodes Incorporated is still sufficient for standard logic-level applications. Verify that your circuit's load requirements do not exceed this current specification before substitution.

Q: Is MC74HC126ADG suitable for new designs? A: No. This part is marked as obsolete and should not be selected for new designs. Use active alternatives such as MC74HC126ADR2G, SN74HC126DR, or MM74HC126M instead.

Q: Do all substitutes maintain the same temperature operating range? A: No. The original SN74HC126DT operates from -40°C to 85°C. Some substitutes, including 74HC126D,653 and 74HC126S14-13, extend to -40°C to 125°C. MC74HC126ADR2G extends to -55°C to 125°C. Verify that the selected substitute meets your application's temperature requirements.

Q: Are all listed parts ROHS3 compliant? A: Yes. All active and recommended substitute parts listed carry ROHS3 compliance certification. Moisture Sensitivity Level is 1 (Unlimited) across all parts, indicating no special moisture handling requirements.

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