SN74HC251DBR Equivalent & Substitute Parts

Part Overview

The SN74HC251DBR is a logic multiplexer IC manufactured by Texas Instruments, featuring a 1 x 8:1 multiplexer configuration in a 16-SSOP surface mount package. This active product is designed for digital signal routing and selection applications requiring single-supply operation across a 2V to 6V range. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating, making it suitable for standard industrial and commercial applications. Equivalent and substitute parts are identified based on matching functional specifications, electrical parameters, and package compatibility to ensure seamless integration in circuit designs.

Substiute Parts

SN74HC251DBR

Texas InstrumentsIn Stock: 2315SN74HC251DBR Datasheet

Current PartRFQ

74HC251PW,118

Nexperia USA Inc.In Stock: 293574HC251PW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC251DBR is determined by the following critical parameters:

Functional Equivalence: All substitute parts must maintain the 1 x 8:1 multiplexer circuit configuration and 74HC base product number designation, ensuring identical logic functionality and pin compatibility.

Electrical Compatibility: Substitute parts must operate within the specified 2V to 6V single-supply voltage range. Output current ratings may vary within acceptable limits for the application, provided the substitute meets or exceeds the original specification.

Package Compatibility: The primary substitute identified operates in a 16-TSSOP package, which is mechanically and electrically compatible with the 16-SSOP original, though with different physical dimensions. Both packages are surface mount configurations suitable for automated assembly.

Compliance and Status: All substitute parts must maintain ROHS3 compliance and active product status to ensure long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The 74HC251PW,118 from Nexperia USA Inc. is a qualified substitute for the SN74HC251DBR based on functional and electrical equivalence. Both parts share the identical 74HC251 base product number and 1 x 8:1 multiplexer configuration, ensuring pin-compatible operation in existing circuit designs.

The substitute part offers an extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), providing additional thermal margin for demanding applications. The output current specification of the substitute (5.2mA) is lower than the original (7.8mA); this difference must be evaluated against specific circuit load requirements to confirm suitability.

Package transition from 16-SSOP to 16-TSSOP requires PCB layout modification due to different physical dimensions (5.30mm versus 4.40mm width). Both packages are surface mount configurations with identical pin counts and electrical characteristics, supporting automated assembly processes.

Both parts maintain ROHS3 compliance and active product status, ensuring regulatory alignment and long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can the 74HC251PW,118 be used as a direct pin-for-pin replacement for the SN74HC251DBR?

A: Yes, the parts are electrically and functionally equivalent with identical pin assignments. However, the package transition from 16-SSOP to 16-TSSOP requires PCB layout redesign due to different physical dimensions.

Q: What is the primary difference between the SN74HC251DBR and its substitute?

A: The main differences are manufacturer (Texas Instruments versus Nexperia), package type (16-SSOP versus 16-TSSOP), output current rating (7.8mA versus 5.2mA), and operating temperature range (-40°C to 85°C versus -40°C to 125°C).

Q: Is the lower output current of the substitute part a limitation?

A: The 5.2mA output current of the substitute must be verified against circuit load requirements. Applications requiring the full 7.8mA output capability of the original part may require additional buffering or alternative component selection.

Q: Are both parts RoHS compliant?

A: Yes, both the SN74HC251DBR and 74HC251PW,118 are ROHS3 compliant and suitable for applications with RoHS regulatory requirements.

Q: What is the moisture sensitivity level for these parts?

A: Both parts carry a Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no special moisture handling precautions are required during storage or assembly.