74LCX257MTC Equivalent & Substitute Parts

Part Overview

The 74LCX257MTC is a 4 x 2:1 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 new designs and production continuity. The 74LCX257MTC operates from a single 2V to 3.6V supply with output drive capability of 24mA high and low, suitable for low-voltage digital logic applications requiring signal multiplexing functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LCX257MTC
Manufacturer	onsemi
Type	Multiplexer 4 x 2:1
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Voltage Supply Range	2V ~ 3.6V
Output Current (High/Low)	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74LCX257MTC is determined by the following critical parameters:

Functional Equivalence: Circuit configuration must be 4 x 2:1 multiplexer with 1 independent circuit.

Package Compatibility: 16-TSSOP surface mount package is required for PCB layout compatibility.

Electrical Parameters: Voltage supply range, output current drive capability, and operating temperature range determine functional interchangeability.

Compliance Requirements: RoHS3 compliance and MSL rating (1 - Unlimited) must be maintained.

Substitute parts are categorized as follows:

Direct Manufacturer Equivalents: onsemi parts with identical base product number (74LCX257) and matching electrical specifications
Parametric Equivalents: Parts with same circuit configuration but different base product numbers, requiring functional verification
Similar Parts: Alternative manufacturer solutions with compatible electrical characteristics and package format

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Output Current (High/Low)	Operating Temp	Package	Packaging Type
74LCX257MTC	onsemi	Obsolete	2V ~ 3.6V	24mA / 24mA	-40°C ~ 85°C	16-TSSOP	-
MC74LCX257DTG	onsemi	Active	2.3V ~ 3.6V	8mA / 8mA	-40°C ~ 85°C	16-TSSOP	Tube
MC74LCX257DTR2G	onsemi	Active	2.3V ~ 3.6V	8mA / 8mA	-40°C ~ 85°C	16-TSSOP	Cut Tape (CT)
MC74LCX157DTG	onsemi	Obsolete	2V ~ 3.6V	24mA / 24mA	-40°C ~ 85°C	16-TSSOP	Tube
74LVC257APW,112	NXP Semiconductors	Active	1.2V ~ 3.6V	24mA / 24mA	-40°C ~ 125°C	16-TSSOP	Bulk
74LVC257APW,118	Nexperia USA Inc.	Active	1.2V ~ 3.6V	24mA / 24mA	-40°C ~ 125°C	16-TSSOP	Tape & Reel (TR)
CLVC257AQPWRG4Q1	Texas Instruments	Active	2V ~ 3.6V	24mA / 24mA	-40°C ~ 125°C	16-TSSOP	Cut Tape (CT) & Digi-Reel®
SN74LVC257ADBR	Texas Instruments	Active	1.65V ~ 3.6V	24mA / 24mA	-40°C ~ 85°C	16-SSOP	Cut Tape (CT) & Digi-Reel®
SN74LVC257AMPWREP	Texas Instruments	Active	2V ~ 3.6V	24mA / 24mA	-55°C ~ 125°C	16-TSSOP	Tape & Reel (TR)
SN74LVC257APW	Texas Instruments	Active	1.65V ~ 3.6V	24mA / 24mA	-40°C ~ 85°C	16-TSSOP	Tube
SN74LVC257APWR	Texas Instruments	Active	1.65V ~ 3.6V	24mA / 24mA	-40°C ~ 85°C	16-TSSOP	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Manufacturer Equivalents (onsemi):

MC74LCX257DTG and MC74LCX257DTR2G are active onsemi alternatives within the 74LCX257 family. Both maintain the 16-TSSOP package and operating temperature range. These parts feature reduced output current (8mA vs. 24mA) and a narrower voltage supply range (2.3V ~ 3.6V). Selection between these two depends on packaging requirements: DTG is supplied in Tube format, while DTR2G is supplied in Cut Tape with significantly higher inventory availability (55,300 pcs).

Parametric Equivalent (onsemi):

MC74LCX157DTG is a 74LCX157 base product number with identical electrical specifications to the original 74LCX257MTC (24mA output current, 2V ~ 3.6V supply). This part is obsolete but maintains full parameter compatibility. Use only when circuit topology supports the 74LCX157 configuration.

Active Alternatives (NXP/Nexperia):

74LVC257APW variants from NXP Semiconductors and Nexperia USA Inc. provide active production status with extended voltage range (1.2V ~ 3.6V) and extended operating temperature to 125°C. Output current matches the original specification (24mA). Available in Bulk and Tape & Reel packaging formats with substantial inventory.

Active Alternatives (Texas Instruments):

SN74LVC257 series from Texas Instruments offers multiple packaging and temperature options, all with active product status and RoHS3 compliance. SN74LVC257APWR and SN74LVC257APW maintain the 16-TSSOP package with 24mA output current. SN74LVC257ADBR uses 16-SSOP package (0.209" width vs. 0.173"), requiring PCB layout verification. SN74LVC257AMPWREP extends operating temperature to -55°C ~ 125°C for extended temperature applications.

CLVC257AQPWRG4Q1 from Texas Instruments includes automotive qualification (AEC-Q100) with active status, suitable for automotive-grade applications.

Selection Priority:

For new designs, prioritize active production status parts. MC74LCX257DTR2G offers the highest inventory availability among onsemi alternatives. For extended temperature or voltage range requirements, NXP 74LVC257APW variants or Texas Instruments SN74LVC257 series provide superior specifications. For automotive applications, CLVC257AQPWRG4Q1 is the qualified choice.

Frequently Asked Questions (FAQ)

Q: Can MC74LCX257DTG replace 74LCX257MTC directly?

A: MC74LCX257DTG is functionally compatible in the 16-TSSOP package and maintains the same operating temperature range. However, output current is reduced from 24mA to 8mA, and the minimum supply voltage increases from 2V to 2.3V. Verify that your circuit design tolerates these electrical differences before substitution.

Q: What is the difference between MC74LCX257DTG and MC74LCX257DTR2G?

A: Both parts are electrically identical with the same specifications. The difference is packaging format: DTG is supplied in Tube, while DTR2G is supplied in Cut Tape (CT). MC74LCX257DTR2G has significantly higher inventory (55,300 pcs vs. 1,657 pcs). Select based on your assembly process requirements.

Q: Why do SN74LVC257 parts have different voltage ranges?

A: Texas Instruments offers multiple variants of the SN74LVC257 with different voltage specifications. SN74LVC257APW and SN74LVC257APWR support 1.65V ~ 3.6V, while SN74LVC257AMPWREP supports 2V ~ 3.6V. Verify your circuit's minimum supply voltage requirement before selection.

Q: Is SN74LVC257ADBR compatible with 74LCX257MTC?

A: SN74LVC257ADBR is functionally equivalent but uses 16-SSOP package (0.209" width) instead of 16-TSSOP (0.173" width). PCB footprint and layout must be verified for compatibility. Electrical specifications match the original part.

Q: What does "Active" product status mean for substitution?

A: Active status indicates the part is in current production with ongoing manufacturer support and availability. Obsolete parts like 74LCX257MTC have limited future availability. Substituting with active parts ensures long-term supply chain reliability.

Q: Can I use 74LVC257APW,112 in place of 74LCX257MTC?

A: Yes. 74LVC257APW,112 is functionally compatible with identical output current (24mA) and package (16-TSSOP). It offers extended voltage range (1.2V ~ 3.6V) and extended operating temperature (-40°C ~ 125°C), making it suitable for broader application requirements. The part is in active production status.

Q: What is the significance of RoHS3 compliance?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. All listed substitute parts maintain RoHS3 compliance, ensuring regulatory compatibility for new designs and production.

Q: Should I choose Tube or Tape & Reel packaging?

A: Packaging selection depends on assembly process. Tube packaging is suitable for manual or small-batch assembly. Tape & Reel (TR) format is required for automated pick-and-place assembly. Both formats are available across the substitute options.

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