CD74HCT251M Equivalent & Substitute Parts

Part Overview

The CD74HCT251M is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The CD74HCT251M operates from a single 4.5V to 5.5V supply and is rated for -55°C to 125°C operating temperature range with 4mA output drive capability.

Substiute Parts

CD74HCT251M

Texas InstrumentsIn Stock: 1325CD74HCT251M Datasheet

Current PartRFQ

CD74HCT251M96

Texas InstrumentsIn Stock: 1987CD74HCT251M96 Datasheet

DirectRFQ

CD74HCT151M

Harris CorporationIn Stock: 4958CD74HCT151M Datasheet

Parametric EquivalentRFQ

74HCT139D,653

Nexperia USA Inc.In Stock: 422374HCT139D,653 Datasheet

MFR RecommendedRFQ

74HCT251D,652

Nexperia USA Inc.In Stock: 73174HCT251D,652 Datasheet

MFR RecommendedRFQ

74HCT251D,653

Nexperia USA Inc.In Stock: 315274HCT251D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HCT251M is determined by the following critical parameters: circuit configuration (1 x 8:1 multiplexer), voltage supply range (4.5V ~ 5.5V), output current capability (4mA), package type (16-SOIC), and mounting technology (surface mount). Parts are grouped into three categories based on substitution relationship type:

Direct Manufacturer Equivalent: CD74HCT251M96 maintains identical electrical specifications and circuit configuration with packaging variation (Tape & Reel instead of Tube). This part is currently active in production.

Parametric Equivalent: CD74HCT151M provides the same 1 x 8:1 multiplexer circuit with matching electrical parameters but is manufactured by Harris Corporation and carries obsolete product status with non-RoHS compliance.

Manufacturer Recommended Alternatives: 74HCT251D,653 and 74HCT251D,652 are Nexperia USA Inc. manufactured parts with identical 1 x 8:1 multiplexer configuration and matching electrical specifications. The 74HCT139D,653 is a decoder/demultiplexer with different circuit topology (1 x 2:4) and is included as a functional alternative only when application requirements permit different logic configuration.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement of CD74HCT251M in active production, CD74HCT251M96 is the primary choice. This part is manufactured by Texas Instruments with identical electrical specifications, maintains ROHS3 compliance, and carries active product status. The only difference is packaging format (Tape & Reel versus Tube), which does not affect electrical performance or PCB integration.

For applications where Texas Instruments sourcing is unavailable, 74HCT251D,653 manufactured by Nexperia USA Inc. provides equivalent 1 x 8:1 multiplexer functionality with matching voltage supply, output current, and package specifications. This part is currently active and ROHS3 compliant. The operating temperature range is reduced to -40°C to 125°C compared to the original -55°C to 125°C specification.

CD74HCT151M from Harris Corporation maintains identical electrical parameters but carries obsolete product status and non-RoHS compliance, making it unsuitable for new designs or applications requiring regulatory compliance documentation.

74HCT251D,652 is ROHS3 compliant with matching specifications but is obsolete, limiting availability for production quantities.

74HCT139D,653 has different circuit topology (1 x 2:4 decoder/demultiplexer instead of 1 x 8:1 multiplexer) and is not functionally equivalent for standard multiplexer applications.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT251M96 be used as a direct replacement for CD74HCT251M?

A: Yes. CD74HCT251M96 is electrically and functionally identical to CD74HCT251M. The difference is packaging format: CD74HCT251M96 is supplied in Tape & Reel format while CD74HCT251M is supplied in Tube format. Both are 16-SOIC surface mount packages with identical pinout and electrical specifications.

Q: What is the temperature range difference between CD74HCT251M and 74HCT251D,653?

A: CD74HCT251M operates from -55°C to 125°C, while 74HCT251D,653 operates from -40°C to 125°C. The lower temperature limit is 15°C higher for the Nexperia part. Applications requiring operation below -40°C must use CD74HCT251M or CD74HCT251M96.

Q: Why is 74HCT139D,653 listed as a substitute if it has different circuit configuration?

A: 74HCT139D,653 is listed as a manufacturer-recommended alternative only for applications where the different circuit topology (1 x 2:4 decoder/demultiplexer versus 1 x 8:1 multiplexer) can satisfy functional requirements. It is not a direct substitute for standard multiplexer applications.

Q: Is CD74HCT151M suitable for new designs?

A: No. CD74HCT151M is obsolete and non-RoHS compliant. New designs should use CD74HCT251M96 or 74HCT251D,653, both of which are active products with current compliance certifications.

Q: What are the key parameters that determine substitutability?

A: The critical parameters are circuit type (1 x 8:1 multiplexer), voltage supply range (4.5V ~ 5.5V), output current (4mA), package type (16-SOIC), and mounting technology (surface mount). All substitute parts must match these specifications for electrical and mechanical compatibility.