MM74HC126N Equivalent & Substitute Parts

Part Overview

The MM74HC126N is a non-inverting buffer logic integrated circuit manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This 14-DIP package device operates across a 2V to 6V supply voltage range and is classified as obsolete. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for design continuity and procurement reliability.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC126N
Manufacturer	onsemi
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-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
Series	74HC

Substitute Part Grouping Explanation

Substitution of the MM74HC126N is determined by strict alignment of the following parameters:

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
Package / Case: 14-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Series: 74HC

All identified substitute parts maintain these core electrical and mechanical specifications, ensuring direct functional equivalence. Variations in operating temperature range, product status, and compliance certifications are noted but do not affect substitutability within the defined parameter set.

Parameter Comparison

Parameter	MM74HC126N (onsemi)	CD74HC126E (Harris)	SN74HC125N (TI)	SN74HC125NE4 (TI)	SN74HC126N (TI)	TC74HC126AP(F) (Toshiba)
Logic Type	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
Number of Bits per Element	1	1	1	1	1	1
Output Type	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
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

For applications currently using the MM74HC126N, the following selection criteria apply:

Active Product Status Priority: SN74HC126N (Texas Instruments), SN74HC125N (Texas Instruments), and TC74HC126AP(F) (Toshiba Semiconductor and Storage) are active products with current manufacturing support and availability. These are preferred for new designs and ongoing procurement.

Compliance Considerations: SN74HC126N, SN74HC125N, and SN74HC125NE4 carry ROHS3 compliance certification. TC74HC126AP(F) is RoHS compliant. CD74HC126E is RoHS non-compliant. For applications subject to RoHS requirements, select from the compliant alternatives.

Extended Temperature Range: CD74HC126E provides an extended operating temperature range of -55°C to 125°C compared to the standard -40°C to 85°C range of other substitutes. This option is applicable only when extended temperature performance is required and RoHS non-compliance is acceptable.

Inventory Availability: SN74HC125N (Texas Instruments) offers the highest inventory level at 13,552 pieces, followed by CD74HC126E at 2,730 pieces and SN74HC126N at 2,515 pieces.

Frequently Asked Questions (FAQ)

Q: Can SN74HC125N replace MM74HC126N directly? A: Yes. SN74HC125N meets all core electrical and mechanical parameters: 4-element non-inverting buffer with 3-state output, 7.8mA output current, 2V to 6V supply voltage, and 14-DIP through-hole package. Both operate within -40°C to 85°C temperature range.

Q: What is the difference between SN74HC125N and SN74HC126N? A: Both parts are functionally equivalent non-inverting buffers with identical electrical specifications and 14-DIP packaging. The primary difference is the base product number designation (74HC125 versus 74HC126), which reflects different manufacturer part numbering schemes. Both are active products from Texas Instruments with ROHS3 compliance.

Q: Is CD74HC126E suitable for new designs? A: CD74HC126E is classified as obsolete and is RoHS non-compliant. While electrically equivalent, it is not recommended for new designs. Active alternatives such as SN74HC126N or TC74HC126AP(F) are preferred.

Q: Does operating temperature range affect substitutability? A: Operating temperature range does not affect substitutability for applications within the standard -40°C to 85°C range. CD74HC126E's extended range to -55°C to 125°C is an additional capability, not a requirement for substitution.

Q: Are all substitute parts pin-compatible with MM74HC126N? A: Yes. All substitute parts use the 14-DIP (0.300", 7.62mm) through-hole package with identical pinout for non-inverting buffer functionality.

Q: Which substitute offers the best long-term availability? A: SN74HC126N and SN74HC125N (Texas Instruments) are active products with ROHS3 compliance and established supply chains. TC74HC126AP(F) (Toshiba) is also active and RoHS compliant. These three options provide the best long-term procurement reliability.

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