SN74HC257PWT Equivalent & Substitute Parts

Part Overview

The SN74HC257PWT is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments 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 device operates with a single supply voltage between 2V and 6V and is suitable for applications requiring multiplexing functionality in digital logic circuits. Substitute parts maintain identical electrical and mechanical specifications while offering improved availability and active product status.

Key Parameters

Parameter	Value
Type	Multiplexer 4 x 2:1
Circuit Configuration	4 x 2:1
Independent Circuits	1
Output Current (High/Low)	7.8mA / 7.8mA
Supply Voltage Range	2V to 6V
Operating Temperature	-40°C to 85°C
Package Type	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HC257PWT is determined by strict equivalence across the following parameters: circuit type (4 x 2:1 multiplexer), output current specifications (7.8mA high and low), supply voltage range (2V to 6V), operating temperature range (-40°C to 85°C), package configuration (16-TSSOP), and compliance certifications (ROHS3, REACH Unaffected, EAR99). Parts are grouped into three categories based on product status and availability: active parametric equivalents from Texas Instruments, discontinued parametric equivalents from Texas Instruments, and manufacturer-recommended alternatives from other suppliers. All substitute parts maintain identical electrical performance and mechanical compatibility with the original SN74HC257PWT.

Parameter Comparison

Part Number	Manufacturer	Product Status	Circuit	Output Current (mA)	Supply Voltage	Operating Temp	Package	Inventory
SN74HC257PWT	Texas Instruments	Obsolete	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	962
SN74HC157APWR	Texas Instruments	Active	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	2100
SN74HC157PWR	Texas Instruments	Active	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	2000
SN74HC157PWT	Texas Instruments	Discontinued at DiGi Electronics	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	2010
SN74HC158PWR	Texas Instruments	Active	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	4028
SN74HC158PWT	Texas Instruments	Discontinued at DiGi Electronics	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	903
SN74HC257PWR	Texas Instruments	Active	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	1900
SN74HC258PWR	Texas Instruments	Active	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	2637
SN74HC258PWT	Texas Instruments	Discontinued at DiGi Electronics	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 85°C	16-TSSOP	886
74HC257PW,118	Nexperia USA Inc.	Active	4 x 2:1	7.8 / 7.8	2V - 6V	-40°C to 125°C	16-TSSOP	12800

Engineering Selection Recommendations

For new designs and production applications, SN74HC157APWR, SN74HC157PWR, SN74HC158PWR, SN74HC257PWR, and SN74HC258PWR are recommended as primary substitutes due to active product status from Texas Instruments. These parts maintain full electrical and mechanical compatibility with SN74HC257PWT while offering superior long-term availability and supply chain stability. All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements.

The 74HC257PW,118 from Nexperia USA Inc. is a manufacturer-recommended alternative with extended operating temperature range (-40°C to 125°C) and significantly higher inventory availability (12,800 units). This part is suitable for applications requiring enhanced thermal performance while maintaining identical electrical specifications and 16-TSSOP package compatibility.

Discontinued parts (SN74HC157PWT, SN74HC158PWT, SN74HC258PWT) should be avoided for new designs despite current inventory availability, as these represent end-of-life products with limited future supply assurance.

Frequently Asked Questions (FAQ)

Q: Can SN74HC257PWT be directly replaced with SN74HC157PWR?

A: Yes. Both parts are 4 x 2:1 multiplexers with identical output current (7.8mA high/low), supply voltage range (2V to 6V), operating temperature (-40°C to 85°C), and 16-TSSOP package. Electrical and mechanical compatibility is complete.

Q: What is the difference between the various Texas Instruments 74HC multiplexer part numbers?

A: The base product numbers (74HC157, 74HC158, 74HC257, 74HC258) represent different multiplexer variants within the same family. All variants provided maintain identical 4 x 2:1 circuit configuration, output current, voltage, temperature, and package specifications. Suffix variations (PWR, PWT, APWR) indicate packaging format and product status differences only.

Q: Is the Nexperia 74HC257PW,118 suitable as a substitute?

A: Yes. The 74HC257PW,118 meets all electrical and mechanical requirements of SN74HC257PWT. It offers extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and higher inventory availability. It is manufacturer-recommended for this application.

Q: What packaging differences exist between substitute parts?

A: Packaging designations (PWR = Cut Tape & Digi-Reel, PWT = Tape & Reel, APWR = Tape & Reel) indicate supply format only. All parts use identical 16-TSSOP physical package (0.173", 4.40mm width) suitable for surface mount assembly. Packaging format does not affect electrical performance or PCB compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements identical to the original SN74HC257PWT.

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