MM74HC126MTC Equivalent & Substitute Parts

Part Overview

The MM74HC126MTC is a non-inverting buffer logic IC manufactured by onsemi, featuring 4 elements with 1 bit per element and 3-state output capability. This component operates across a 2V to 6V supply voltage range and is housed in a 14-TSSOP surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC126MTC
Manufacturer	onsemi
Series	74HC
Logic Type	Buffer, Non-Inverting
Number of Elements	4
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-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MM74HC126MTC is determined by strict alignment of the following critical parameters:

Logic type: Buffer, Non-Inverting
Number of elements: 4
Number of bits per element: 1
Output type: 3-State
Output current: 7.8mA (high and low)
Supply voltage range: 2V ~ 6V
Package type: 14-TSSOP surface mount
Base product number: 74HC126

Substitute parts are grouped into three categories: direct manufacturer equivalents (identical specifications), similar parts (same functional and electrical parameters with minor packaging or status variations), and parametric equivalents (functionally compatible with allowable parameter differences).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status
MM74HC126MTC	onsemi	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-TSSOP	Obsolete
MM74HC126MTCX	Fairchild Semiconductor	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-TSSOP	Active
MC74HC126ADTR2G	onsemi	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-TSSOP	Active
NLV74HC126ADTR2G	onsemi	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	14-TSSOP	Obsolete
MM74HC125MTC	Fairchild Semiconductor	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-TSSOP	Active
74HC126PW,118	Nexperia USA Inc.	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 125	14-TSSOP	Active
SN74HC126DBR	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-SSOP	Active
SN74HC126PWR	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-TSSOP	Active
SN74HC126PWT	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-TSSOP	Discontinued at DiGi Electronics
SN74HC126PW	Texas Instruments	Buffer, Non-Inverting	4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	14-TSSOP	Discontinued at DiGi Electronics

Engineering Selection Recommendations

For applications currently using the obsolete MM74HC126MTC, the following selection criteria apply:

Active Status Priority: MM74HC126MTCX (Fairchild Semiconductor), MC74HC126ADTR2G (onsemi), 74HC126PW,118 (Nexperia USA Inc.), SN74HC126PWR (Texas Instruments), and SN74HC126DBR (Texas Instruments) are all active products with current manufacturing support and availability.

Extended Temperature Range: MC74HC126ADTR2G and 74HC126PW,118 support operating temperatures from -55°C to 125°C, compared to the original -40°C to 85°C range, providing enhanced thermal margin for demanding applications.

Compliance and Certifications: All active substitute parts carry RoHS3 compliance and REACH unaffected status. NLV74HC126ADTR2G includes AEC-Q100 automotive qualification, suitable for automotive-grade applications.

Package Considerations: SN74HC126DBR uses 14-SSOP packaging (0.209", 5.30mm width) instead of 14-TSSOP, requiring PCB layout verification before selection. All other substitutes maintain the original 14-TSSOP footprint.

Inventory Availability: SN74HC126PWR shows the highest current inventory (23,405 units), followed by MM74HC126MTCX (18,574 units), providing supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MM74HC126MTC with any of these substitute parts?

A: Direct replacement is possible only with parts maintaining identical electrical parameters (4 elements, 3-state output, 7.8mA output current, 2V-6V supply) and the same 14-TSSOP package. MM74HC126MTCX, MC74HC126ADTR2G, 74HC126PW,118, SN74HC126PWR, and SN74HC126PWT meet these criteria. SN74HC126DBR uses 14-SSOP packaging and requires PCB footprint verification.

Q: What is the difference between MM74HC125MTC and MM74HC126MTC?

A: Both are 4-element non-inverting buffers with 3-state output in 14-TSSOP packaging. The base product numbers (74HC125 vs. 74HC126) indicate different internal logic configurations. MM74HC125MTC is listed as a parametric equivalent, meaning it satisfies the same functional requirements within the allowed parameter set.

Q: Why do some parts have extended temperature ranges (-55°C to 125°C)?

A: Extended temperature range variants like MC74HC126ADTR2G and 74HC126PW,118 are designed for industrial and automotive applications requiring broader thermal operation. These are direct functional substitutes if your application does not require the original -40°C to 85°C specification.

Q: Are discontinued parts suitable for new designs?

A: SN74HC126PWT and SN74HC126PW are discontinued at DiGi Electronics but remain available through alternative distributors. For new designs, active status parts (MM74HC126MTCX, MC74HC126ADTR2G, 74HC126PW,118, SN74HC126PWR, SN74HC126DBR) are recommended to ensure long-term supply continuity.

Q: What packaging options are available?

A: The majority of substitutes use 14-TSSOP surface mount packaging (0.173", 4.40mm width). SN74HC126DBR is available in 14-SSOP (0.209", 5.30mm width), which has a different footprint and requires PCB layout adjustment. Verify your PCB design before selecting this variant.

Q: Do all substitutes have the same output current specifications?

A: Yes, all listed substitutes maintain 7.8mA output current for both high and low states, matching the original MM74HC126MTC specification.

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