74HCT257D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT257D,652 is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates on a single 4.5V to 5.5V supply with output currents of 6mA high and 6mA low, suitable for standard TTL logic applications requiring multiplexing functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	74HCT257D,652
Manufacturer	Nexperia USA Inc.
Category	Logic
Type	Multiplexer 4 x 2:1
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply	4.5V ~ 5.5V
Current - Output High, Low	6mA, 6mA
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 74HCT257D,652 is determined by the following critical parameters:

Functional equivalence: 4 x 2:1 multiplexer circuit configuration with 1 independent circuit
Electrical compatibility: Single supply voltage range 4.5V ~ 5.5V
Output current capability: Minimum 6mA high and low output current
Package compatibility: 16-SOIC surface mount package (0.154", 3.90mm width)
Logic family: 74HCT or compatible logic series (74VHCT acceptable with higher output current)

Substitute parts are grouped into two categories based on product status and compliance:

Category 1 - Active/Preferred Status: Parts with active product status and ROHS3 compliance, suitable for new designs and ongoing production.

Category 2 - Obsolete/Discontinued Status: Parts with obsolete or discontinued status, suitable for legacy system support and replacement applications.

Parameter Comparison

Part Number	Manufacturer	Series	Circuit	Voltage Supply	Output Current (High/Low)	Operating Temp	Package	Product Status	RoHS Status
74HCT257D,652	Nexperia USA Inc.	74HCT	4 x 2:1	4.5V ~ 5.5V	6mA, 6mA	-40°C ~ 125°C	16-SOIC	Obsolete	ROHS3 Compliant
CD74HCT257M	Harris Corporation	74HCT	4 x 2:1	4.5V ~ 5.5V	6mA, 6mA	-55°C ~ 125°C	16-SOIC	Obsolete	RoHS Non-Compliant
CD74HCT257M96	Texas Instruments	74HCT	4 x 2:1	4.5V ~ 5.5V	6mA, 6mA	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
CD74HCT257MT	Texas Instruments	74HCT	4 x 2:1	4.5V ~ 5.5V	6mA, 6mA	-55°C ~ 125°C	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
MC74VHCT257ADR2G	onsemi	74VHCT	4 x 2:1	4.5V ~ 5.5V	8mA, 8mA	-55°C ~ 125°C	16-SOIC	Active	ROHS3 Compliant
SN74HCT257D	Texas Instruments	74HCT	4 x 2:1	4.5V ~ 5.5V	6mA, 6mA	-40°C ~ 85°C	16-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HCT257DR	Texas Instruments	74HCT	4 x 2:1	4.5V ~ 5.5V	6mA, 6mA	-40°C ~ 85°C	16-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Active Status with ROHS3 Compliance:

CD74HCT257M96 (Texas Instruments) and SN74HCT257DR (Texas Instruments) are the preferred substitutes. Both maintain identical electrical specifications to the original part, operate across the full -55°C to -40°C extended temperature range, and carry active product status with ROHS3 compliance. CD74HCT257M96 is supplied in Tape & Reel packaging, while SN74HCT257DR is available in both Tube and Tape & Reel formats.

Secondary Recommendation - Enhanced Output Current:

MC74VHCT257ADR2G (onsemi) provides a functionally equivalent 4 x 2:1 multiplexer with increased output current capability (8mA high and low versus 6mA). This part operates within the same voltage supply range and maintains ROHS3 compliance with active product status. The 74VHCT logic family is compatible with 74HCT logic levels and is suitable for applications requiring higher output drive capability.

Legacy Support Option:

CD74HCT257M (Harris Corporation) maintains electrical equivalence but carries RoHS non-compliance status and obsolete product classification. This part is suitable only for legacy system maintenance where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can I use MC74VHCT257ADR2G as a direct replacement for 74HCT257D,652?

A: Yes. The MC74VHCT257ADR2G provides functional equivalence with identical 4 x 2:1 multiplexer circuit configuration and voltage supply specifications. The 74VHCT logic family is compatible with 74HCT logic levels. The higher output current (8mA versus 6mA) is a superset capability and does not create compatibility issues in standard applications.

Q: What is the difference between Tube and Tape & Reel packaging options?

A: Tube packaging is suitable for manual assembly and small-volume production. Tape & Reel packaging is optimized for automated pick-and-place assembly equipment and high-volume manufacturing. Both formats contain identical die and electrical specifications.

Q: Why is the operating temperature range different between substitute parts?

A: The original 74HCT257D,652 specifies -40°C to 125°C. Substitute parts from Texas Instruments and onsemi extend the lower temperature limit to -55°C, providing broader environmental operating range. This extended range does not affect compatibility in applications operating within the original -40°C to 125°C specification.

Q: Are all substitute parts ROHS3 compliant?

A: No. CD74HCT257M (Harris Corporation) is RoHS non-compliant. All other listed substitutes carry ROHS3 compliance certification. For new designs and regulated applications, select only ROHS3 compliant parts.

Q: Can I mix different substitute parts in the same production run?

A: Yes, provided all selected parts meet your application's electrical, thermal, and compliance requirements. Verify that output current, operating temperature range, and RoHS status align with your design specifications before mixing manufacturers or part variants.

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