74LCX157MTC Equivalent & Substitute Parts

Part Overview

The 74LCX157MTC is a 4x2:1 multiplexer logic IC manufactured by onsemi in a 16-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74LCX157MTC operates from a single 2V to 3.6V supply with 24mA output drive capability and is suitable for low-voltage logic applications requiring multiplexing functionality across -40°C to 85°C operating temperature range.

Key Parameters

Parameter	Value
Type	Multiplexer 4x2:1
Package	16-TSSOP (0.173", 4.40mm Width)
Voltage Supply	2V ~ 3.6V
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74LCX157MTC is determined by the following critical parameters: multiplexer circuit configuration (4x2:1), package type (16-TSSOP), voltage supply range compatibility, output current capability (24mA minimum), and operating temperature range. Parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications and package footprint, differing only in packaging format (tube vs. tape & reel) or manufacturer designation. These provide direct functional replacement.

Similar Parts share the same multiplexer function and package footprint but may extend voltage supply range (1.2V minimum), operating temperature range (up to 125°C), or include automotive qualification (AEC-Q100). These are compatible when application requirements permit the enhanced specifications.

Parameter Comparison

Part Number	Manufacturer	Series	Voltage Supply	Operating Temp	Package	Output Current	Product Status	Automotive Grade
74LCX157MTC	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	24mA / 24mA	Obsolete	No
MC74LCX157DTG	onsemi	74LCX	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	24mA / 24mA	Obsolete	No
74LVC157APW,118	Nexperia USA Inc.	74LVC	1.2V ~ 3.6V	-40°C ~ 125°C	16-TSSOP	24mA / 24mA	Active	No
74LVC157APW-Q100J	Nexperia USA Inc.	74LVC	1.2V ~ 3.6V	-40°C ~ 125°C	16-TSSOP	24mA / 24mA	Active	Yes (AEC-Q100)
CLVC157AQPWRG4Q1	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 125°C	16-TSSOP	24mA / 24mA	Active	Yes (AEC-Q100)
SN74LVC157ADBR	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 85°C	16-SSOP	24mA / 24mA	Active	No
SN74LVC157APWR	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	24mA / 24mA	Active	No
SN74LVC157APWRE4	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	24mA / 24mA	Discontinued at DiGi Electronics	No
SN74LVC157APWRG4	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	24mA / 24mA	Discontinued at DiGi Electronics	No
SN74LVC157APWT	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 85°C	16-TSSOP	24mA / 24mA	Active	No
SN74LVC157AQPWREP	Texas Instruments	74LVC	2V ~ 3.6V	-40°C ~ 125°C	16-TSSOP	24mA / 24mA	Active	No

Engineering Selection Recommendations

For direct replacement of the obsolete 74LCX157MTC, MC74LCX157DTG provides parametric equivalence with identical electrical and thermal specifications, differing only in packaging format (tube).

For active production designs, SN74LVC157APWR and SN74LVC157APWT from Texas Instruments offer active product status with matching voltage supply range (2V ~ 3.6V) and operating temperature (-40°C ~ 85°C), maintaining full compatibility with the original 74LCX157MTC specifications.

For applications requiring extended operating temperature range to 125°C, SN74LVC157AQPWREP provides active status with this enhanced capability while maintaining the 2V ~ 3.6V supply range.

For automotive applications requiring AEC-Q100 qualification, CLVC157AQPWRG4Q1 from Texas Instruments or 74LVC157APW-Q100J from Nexperia USA Inc. are qualified options. CLVC157AQPWRG4Q1 maintains the original 2V ~ 3.6V supply range, while 74LVC157APW-Q100J extends the minimum supply voltage to 1.2V.

SN74LVC157ADBR is a package variant in 16-SSOP (0.209", 5.30mm width) rather than 16-TSSOP, suitable only when PCB layout accommodates the wider package footprint.

Frequently Asked Questions (FAQ)

Q: Can I use 74LVC157APW,118 as a direct replacement for 74LCX157MTC?

A: Yes. Both parts share identical 4x2:1 multiplexer function, 16-TSSOP package footprint, and 24mA output drive. The 74LVC157APW,118 extends the voltage supply range to 1.2V minimum and operating temperature to 125°C, making it a compatible upgrade with enhanced specifications.

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

A: 16-TSSOP has a 0.173" (4.40mm) width, while 16-SSOP has a 0.209" (5.30mm) width. These are not interchangeable on the same PCB footprint. SN74LVC157ADBR uses the wider 16-SSOP package and requires different board layout.

Q: Are the automotive-qualified parts (CLVC157AQPWRG4Q1 and 74LVC157APW-Q100J) suitable for non-automotive applications?

A: Yes. Automotive qualification (AEC-Q100) indicates additional testing and reliability assurance. These parts are fully compatible with non-automotive designs and provide enhanced quality assurance.

Q: Why do some substitute parts show "Discontinued at DiGi Electronics" status?

A: SN74LVC157APWRE4 and SN74LVC157APWRG4 are discontinued at DiGi Electronics but remain functionally equivalent to the 74LCX157MTC. Availability through alternative distributors should be confirmed before design selection.

Q: What is the significance of the voltage supply range difference between 2V ~ 3.6V and 1.2V ~ 3.6V?

A: Parts rated for 1.2V minimum supply (such as 74LVC157APW,118) can operate in lower-voltage applications. Parts rated for 2V minimum (such as 74LCX157MTC) require higher minimum supply voltage. Both ranges are compatible when the application supply voltage falls within the specified range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), matching the environmental and moisture sensitivity specifications of the original 74LCX157MTC.

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