CD74HC126MT Equivalent & Substitute Parts

Part Overview

The CD74HC126MT 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	CD74HC126MT
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	-55°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC126MT is determined by strict equivalence across the following parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 4
Number of Bits per Element: 1
Output Type: 3-State
Voltage - Supply: 2V ~ 6V
Package / Case: 14-SOIC (0.154", 3.90mm Width)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into three categories based on manufacturer and product status:

Parametric Equivalents (Texas Instruments): CD74HC125M96, CD74HC125MT, and CD74HC126M96 maintain identical electrical specifications and packaging, with variations in base product number (74HC125 vs. 74HC126) and packaging format (Cut Tape vs. Tape & Reel).

Manufacturer Recommended Substitutes (Nexperia, Diodes Incorporated): 74HC126D,653, 74HC126D-Q100J, and 74HC126S14-13 provide functional equivalence with minor variations in operating temperature range and output current specifications.

Cross-Manufacturer Alternatives (onsemi, Fairchild Semiconductor): MC74HC126ADG, MM74HC126M, MM74HC126MX, and MC74HC125ADR2G offer functional compatibility with differences in product status and temperature operating ranges.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Type	Current (mA)	Voltage Supply	Temp Range (°C)	Package	Product Status
CD74HC126MT	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Discontinued
CD74HC125M96	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active
CD74HC125MT	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Discontinued
CD74HC126M96	Texas Instruments	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active
74HC126D,653	Nexperia USA Inc.	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	14-SOIC	Active
74HC126D-Q100J	Nexperia USA Inc.	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	14-SOIC	Active
74HC126S14-13	Diodes Incorporated	Buffer, Non-Inverting	4 x 1-bit	3-State	5.2 / 5.2	2V ~ 6V	-40 ~ 125	14-SOIC	Active
MC74HC126ADG	onsemi	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Obsolete
MM74HC126M	Fairchild Semiconductor	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active
MM74HC126MX	Fairchild Semiconductor	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active
MC74HC125ADR2G	onsemi	Buffer, Non-Inverting	4 x 1-bit	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: CD74HC126M96 (Texas Instruments) is the direct active equivalent with identical electrical specifications, operating temperature range (-55°C to 125°C), and output current ratings (7.8mA). This part maintains full compatibility with the original CD74HC126MT design.

Alternative from Active Inventory: CD74HC125M96 (Texas Instruments) provides parametric equivalence with the same electrical performance and temperature range. The base product number difference (74HC125 vs. 74HC126) does not affect functional compatibility for buffer applications.

Cross-Manufacturer Options: MC74HC125ADR2G (onsemi) and MC74HC126ADG (onsemi) maintain identical electrical specifications and temperature range. MC74HC126ADG is currently obsolete; MC74HC125ADR2G is active with substantial inventory availability.

Temperature-Constrained Alternatives: 74HC126D,653 (Nexperia), 74HC126D-Q100J (Nexperia), MM74HC126M, and MM74HC126MX (Fairchild Semiconductor) operate within a narrower temperature range (-40°C to 125°C or -40°C to 85°C). These are suitable for applications not requiring the full -55°C lower temperature limit.

Output Current Consideration: 74HC126S14-13 (Diodes Incorporated) specifies reduced output current (5.2mA vs. 7.8mA). This part is suitable only for applications with lower current drive requirements.

Frequently Asked Questions (FAQ)

Q: Can I use CD74HC125M96 as a direct replacement for CD74HC126MT?

A: Yes. Both parts are Texas Instruments 74HC series non-inverting buffers with 4 elements, 1 bit per element, 3-state output, identical electrical specifications (7.8mA output current, 2V to 6V supply), and matching operating temperature range (-55°C to 125°C). The base product number difference does not affect functional compatibility.

Q: What is the difference between the 74HC125 and 74HC126 base product numbers?

A: Both are non-inverting buffer ICs with identical pin configurations and electrical characteristics within the 74HC series. The numerical designation reflects internal logic architecture but does not impact substitution compatibility for standard buffer applications.

Q: Are Nexperia 74HC126D,653 and 74HC126D-Q100J suitable replacements?

A: Both are functionally equivalent with identical electrical specifications and 14-SOIC packaging. The operating temperature range is -40°C to 125°C, which is narrower than the original -55°C to 125°C. Use these parts only if your application does not require operation below -40°C. The 74HC126D-Q100J includes AEC-Q100 automotive qualification.

Q: Why does 74HC126S14-13 (Diodes Incorporated) have lower output current?

A: This part specifies 5.2mA output current versus 7.8mA for other equivalents. It is suitable only for applications with lower current drive requirements. Verify your circuit's current demands before selection.

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

A: Both formats contain identical components in 14-SOIC packages. Cut Tape is supplied in smaller quantities on individual tape segments; Tape & Reel is supplied in continuous reel format for high-volume automated assembly. Electrical and functional performance is identical.

Q: Can I use MC74HC126ADG (onsemi) as a replacement?

A: MC74HC126ADG is currently obsolete and not recommended for new designs. MC74HC125ADR2G (onsemi) is the active alternative from this manufacturer, offering identical electrical specifications and temperature range with higher inventory availability.

Q: Are Fairchild Semiconductor MM74HC126M and MM74HC126MX suitable alternatives?

A: Both parts provide functional equivalence with identical electrical specifications and 14-SOIC packaging. The operating temperature range is -40°C to 85°C, which is narrower than the original. Use these parts only if your application operates within this temperature window.

Q: What RoHS and compliance status applies to substitute parts?

A: All recommended substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original CD74HC126MT. All parts carry EAR99 ECCN classification and REACH Unaffected status.

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