CD74HC126M Equivalent & Substitute Parts

Part Overview

The CD74HC126M 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. The CD74HC126M is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74HC126M
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)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Series	74HC

Substitute Part Grouping Explanation

Substitute parts for the CD74HC126M are classified based on the following substitution criteria:

Direct Manufacturer Equivalents maintain identical electrical specifications, package configuration, and functional characteristics. These parts are interchangeable without design modification.

Parametric Equivalents share the same logic function, pin count, and electrical performance within specified tolerances but may differ in manufacturer, product status, or compliance certifications. These require verification of compliance requirements before substitution.

Key Parameters Determining Substitutability:

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)
Mounting Type: Surface Mount
Current - Output High, Low: 7.8mA, 7.8mA (or lower)
Operating Temperature Range: -55°C ~ 125°C or -40°C ~ 125°C

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	RoHS Status
CD74HC126M	Texas Instruments	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Discontinued	ROHS3
CD74HC126M96	Texas Instruments	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active	ROHS3
CD74HC125M	Harris Corporation	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Obsolete	Non-compliant
MM74HC126M	Fairchild Semiconductor	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active	Not specified
74HC126D,653	Nexperia USA Inc.	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-40 ~ 125	14-SO	Active	ROHS3
74HC126D-Q100J	Nexperia USA Inc.	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-40 ~ 125	14-SO	Active	ROHS3
74HC126S14-13	Diodes Incorporated	Buffer, Non-Inverting	4	5.2 / 5.2	2V ~ 6V	-40 ~ 125	14-SO	Active	ROHS3
MC74HC126ADR2G	onsemi	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active	ROHS3
MM74HC126MX	Fairchild Semiconductor	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SOIC	Active	Not specified
MC74HC125ADG	Fairchild Semiconductor	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Active	Not specified
MC74HC126ADG	onsemi	Buffer, Non-Inverting	4	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-SOIC	Obsolete	ROHS3

Engineering Selection Recommendations

Preferred Direct Replacement: CD74HC126M96 (Texas Instruments) is the primary substitute, offering identical electrical specifications and active product status. This part maintains the same 14-SOIC package, supply voltage range, operating temperature range, and output current characteristics as the original CD74HC126M.

Active Production Alternatives: MC74HC126ADR2G (onsemi) provides full electrical equivalence with active product status and ROHS3 compliance. This part matches the original specifications across all critical parameters including output current, supply voltage, and operating temperature range.

74HC126D,653 and 74HC126D-Q100J (Nexperia USA Inc.) are active alternatives with ROHS3 compliance. Both maintain equivalent electrical performance and support the full operating temperature range. The 74HC126D-Q100J includes AEC-Q100 automotive qualification.

Temperature-Constrained Alternatives: MM74HC126M and MM74HC126MX (Fairchild Semiconductor) are active parts with identical electrical specifications but operate within a reduced temperature range of -40°C to 85°C. These are suitable only for applications not requiring the extended -55°C lower temperature limit.

Current-Reduced Alternative: 74HC126S14-13 (Diodes Incorporated) features reduced output current specifications (5.2mA versus 7.8mA) and is suitable only for applications with lower current drive requirements.

Obsolete or Non-Compliant Parts: CD74HC125M (Harris Corporation) and MC74HC126ADG (onsemi) are obsolete or have non-compliant RoHS status and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can CD74HC126M96 be used as a direct replacement for CD74HC126M? A: Yes. CD74HC126M96 is a direct equivalent from the same manufacturer (Texas Instruments) with identical electrical specifications, package configuration, and functional characteristics. The primary difference is packaging format (Tape & Reel versus Tube) and active product status.

Q: What is the difference between 14-SOIC and 14-SO packages? A: Both designations refer to 14-pin small outline integrated circuit packages with 0.154" width and 3.90mm pitch. These are mechanically and electrically compatible for PCB assembly purposes.

Q: Are the Nexperia parts (74HC126D,653 and 74HC126D-Q100J) suitable replacements? A: Yes, both Nexperia parts are suitable replacements with active product status and ROHS3 compliance. The 74HC126D-Q100J includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.

Q: Why does 74HC126S14-13 have lower output current specifications? A: The 74HC126S14-13 from Diodes Incorporated is specified with 5.2mA output current versus 7.8mA for the original part. This part is suitable only for applications with lower current drive requirements and should not be used as a general replacement.

Q: Can Fairchild Semiconductor parts (MM74HC126M or MM74HC126MX) replace the CD74HC126M in all applications? A: Fairchild parts are suitable only for applications operating within the -40°C to 85°C temperature range. They cannot replace the CD74HC126M in applications requiring the extended -55°C lower temperature limit.

Q: What compliance certifications should I verify before substitution? A: Verify RoHS compliance status for your application requirements. The CD74HC126M is ROHS3 compliant. Most active alternatives (CD74HC126M96, MC74HC126ADR2G, 74HC126D,653, 74HC126D-Q100J, 74HC126S14-13) maintain ROHS3 compliance. Fairchild parts do not specify RoHS status.

Q: Is moisture sensitivity level (MSL) a factor in part selection? A: The CD74HC126M and most active alternatives are rated MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling. This specification is consistent across equivalent parts.

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