MM74HC157MTCX Equivalent & Substitute Parts

Part Overview

The MM74HC157MTCX is a 4 x 2:1 multiplexer logic IC manufactured by onsemi in 16-TSSOP surface mount packaging. This component functions as a data selector, routing one of four input pairs to a single output based on control signals. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain identical circuit configuration (4 x 2:1), matching package type (16-TSSOP), and compatible electrical specifications to ensure direct board-level replacement without design modification.

Key Parameters

Parameter	Value
Circuit Configuration	4 x 2:1 Multiplexer
Package Type	16-TSSOP (0.173", 4.40mm Width)
Voltage Supply Range	2V ~ 6V
Output Current (High/Low)	5.2mA / 5.2mA
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC157MTCX is determined by the following criteria:

Primary Compatibility Requirements:

Circuit configuration must be 4 x 2:1 multiplexer
Package must be 16-TSSOP with identical pinout
Voltage supply range must encompass or match 2V ~ 6V specification
Operating temperature range must support -40°C ~ 85°C minimum
Mounting type must be surface mount

Secondary Compatibility Factors:

Output current specifications may vary within acceptable design margins
Product status (active vs. discontinued) affects long-term availability
RoHS and REACH compliance status for regulatory requirements
Packaging format (tube, tape & reel, cut tape) affects procurement logistics

Parts are grouped as direct substitutes when all primary requirements are met. Similar parts with package variations (16-SSOP vs. 16-TSSOP) are noted separately due to physical incompatibility with existing PCB layouts.

Parameter Comparison

Part Number	Manufacturer	Series	Circuit	Package	Voltage Supply	Output Current (H/L)	Temp Range	Status
MM74HC157MTCX	onsemi	74HC	4 x 2:1	16-TSSOP	2V ~ 6V	5.2mA / 5.2mA	-40°C ~ 85°C	Obsolete
74VHC157MTCX	Fairchild Semiconductor	74VHC	4 x 2:1	16-TSSOP	2V ~ 5.5V	8mA / 8mA	-40°C ~ 85°C	Active
MC74HC157ADTR2G	onsemi	74HC	4 x 2:1	16-TSSOP	2V ~ 6V	7.8mA / 7.8mA	-55°C ~ 125°C	Active
SN74HC157PW	Texas Instruments	74HC	4 x 2:1	16-TSSOP	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Discontinued
SN74HC157PWR	Texas Instruments	74HC	4 x 2:1	16-TSSOP	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Active
SN74HC157PWT	Texas Instruments	74HC	4 x 2:1	16-TSSOP	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Discontinued
74HC157PW,118	Nexperia USA Inc.	74HC	4 x 2:1	16-TSSOP	2V ~ 6V	5.2mA / 5.2mA	-40°C ~ 125°C	Active
SN74HC157DBR	Texas Instruments	74HC	4 x 2:1	16-SSOP	2V ~ 6V	7.8mA / 7.8mA	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Substitutes (16-TSSOP Package):

For applications requiring immediate replacement with active product status and full voltage compatibility, SN74HC157PWR (Texas Instruments) is the primary selection. This part maintains identical voltage supply range (2V ~ 6V), operating temperature specification (-40°C ~ 85°C), and 16-TSSOP package geometry. RoHS3 compliance and unlimited moisture sensitivity level match the original specification.

MC74HC157ADTR2G (onsemi) provides an alternative with extended operating temperature range (-55°C ~ 125°C) and active product status. This part is supplied in tape & reel packaging and maintains full voltage compatibility. The higher output current specification (7.8mA vs. 5.2mA) is within acceptable design margins for standard logic applications.

74HC157PW,118 (Nexperia USA Inc.) offers matching output current characteristics (5.2mA / 5.2mA) to the original part with extended temperature range (-40°C ~ 125°C) and active status. This part provides the closest electrical match while ensuring long-term availability.

74VHC157MTCX (Fairchild Semiconductor) is suitable for applications operating within 2V ~ 5.5V supply range. The higher output current (8mA) and active product status support demanding load conditions. Voltage supply range is slightly reduced compared to the original specification.

Package Variant (16-SSOP):

SN74HC157DBR (Texas Instruments) provides identical circuit functionality in 16-SSOP packaging (0.209", 5.30mm width). This part is not suitable for direct PCB replacement due to physical package incompatibility but may be considered for new designs or board redesigns requiring this package format.

Discontinued Parts:

SN74HC157PW and SN74HC157PWT (Texas Instruments) are listed as discontinued at DiGi Electronics and should not be selected for new production designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC157PWR as a direct replacement for MM74HC157MTCX?

A: Yes. SN74HC157PWR maintains identical 16-TSSOP package geometry, voltage supply range (2V ~ 6V), operating temperature range (-40°C ~ 85°C), and circuit configuration (4 x 2:1). The part is currently active and RoHS3 compliant. No PCB layout modifications are required.

Q: What is the difference between 16-TSSOP and 16-SSOP packages?

A: 16-TSSOP has a body width of 0.173" (4.40mm), while 16-SSOP has a body width of 0.209" (5.30mm). These packages have different pinout footprints and are not physically interchangeable on existing PCBs. SN74HC157DBR in 16-SSOP packaging requires board redesign.

Q: Why does MC74HC157ADTR2G have higher output current (7.8mA) than the original part (5.2mA)?

A: Output current specifications vary by manufacturer design and process technology. The higher current capability of MC74HC157ADTR2G is compatible with standard logic applications and does not create incompatibility. Designs using the original 5.2mA specification will operate correctly with this part.

Q: Is 74VHC157MTCX compatible with the full 2V ~ 6V supply range?

A: No. 74VHC157MTCX operates within 2V ~ 5.5V supply range, which is narrower than the original MM74HC157MTCX specification (2V ~ 6V). This part is suitable only for applications operating at or below 5.5V supply voltage.

Q: What does "discontinued at DiGi Electronics" mean for SN74HC157PW and SN74HC157PWT?

A: These parts are no longer actively distributed through DiGi Electronics but may remain available through other suppliers or inventory channels. For new production designs, active status parts (SN74HC157PWR, MC74HC157ADTR2G, 74HC157PW,118) are recommended to ensure long-term supply continuity.

Q: Does the extended temperature range of MC74HC157ADTR2G (-55°C ~ 125°C) affect compatibility?

A: No. Extended temperature range indicates broader operational capability and does not create incompatibility. Applications requiring only -40°C ~ 85°C operation will function correctly with this part.

Q: What packaging formats are available for substitute parts?

A: SN74HC157PWR is supplied in cut tape and Digi-Reel format. MC74HC157ADTR2G and 74HC157PW,118 are supplied in tape & reel format. SN74HC157PW is supplied in tube format. Packaging selection depends on procurement volume and assembly line requirements.

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