SN74HC151ANS Equivalent & Substitute Parts

Part Overview

The SN74HC151ANS is a Data Selector/Multiplexer integrated circuit with a 1 x 8:1 configuration, manufactured by Texas Instruments in the 74HC logic series. This component functions as a digital multiplexer, selecting one of eight input data lines and routing it to a single output based on address control signals. The SN74HC151ANS is designated as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Substiute Parts

SN74HC151ANS

Texas InstrumentsIn Stock: 1066SN74HC151ANS Datasheet

Current PartRFQ

SN74HC151ANSR

Texas InstrumentsIn Stock: 3439SN74HC151ANSR Datasheet

Parametric EquivalentRFQ

SN74HC251ANSR

Texas InstrumentsIn Stock: 3119SN74HC251ANSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC151ANS is determined by strict parametric equivalence across the following critical criteria:

Functional Equivalence: The substitute part must be a Data Selector/Multiplexer with identical 1 x 8:1 circuit configuration and single independent circuit topology.

Electrical Specifications: Output current ratings (7.8 mA high and low), single supply voltage source, and supply voltage range (2V ~ 6V) must be identical. Operating temperature range (-40°C ~ 85°C) must match or exceed the original specification.

Physical Compatibility: Package type must be 16-SOIC with identical dimensions (0.209", 5.30mm width) to ensure direct board-level substitution without layout modifications.

Compliance & Environmental: RoHS3 compliance and MSL rating of 1 (Unlimited) are mandatory for equivalent substitution in regulated applications.

Series Consistency: Parts must belong to the 74HC logic series to maintain timing characteristics and logic family compatibility.

Substitute parts identified below meet all these criteria and are classified as parametric equivalents suitable for direct replacement in the SN74HC151ANS application.

Parameter Comparison

Engineering Selection Recommendations

SN74HC151ANSR is the primary substitute for SN74HC151ANS. This part maintains identical electrical and physical specifications while offering Active product status, ensuring ongoing availability and manufacturing support. The transition from Last Time Buy to Active status provides supply chain continuity without design modification. Current inventory of 3382 units supports immediate procurement requirements.

SN74HC251ANSR is an alternative substitute meeting all parametric equivalence criteria. This part also carries Active product status and is available in equivalent quantities (3100 units). Selection between SN74HC151ANSR and SN74HC251ANSR depends on application-specific requirements not defined by the provided electrical and mechanical parameters. Both parts are ROHS3 compliant and suitable for regulated environments.

Both substitute parts eliminate Last Time Buy risk while maintaining full functional and physical compatibility with existing SN74HC151ANS designs. No circuit modifications, board layout changes, or firmware updates are required for substitution.

Frequently Asked Questions (FAQ)

Q: Can SN74HC151ANSR be used as a direct replacement for SN74HC151ANS?

A: Yes. SN74HC151ANSR is a parametric equivalent with identical electrical specifications (7.8 mA output current, 2V ~ 6V supply range, -40°C ~ 85°C operating temperature), identical 16-SOIC package dimensions, and matching RoHS3 compliance. Direct board-level substitution is supported without design changes.

Q: What is the difference between SN74HC151ANSR and SN74HC251ANSR?

A: Both parts are parametric equivalents of SN74HC151ANS with identical electrical and physical specifications. The difference lies in the part number designation (151 versus 251 series identifier). Both are Active status products from Texas Instruments with equivalent availability and compliance certifications.

Q: Why is SN74HC151ANS designated as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific part number. Substitute parts with Active status (SN74HC151ANSR and SN74HC251ANSR) ensure continued access to equivalent functionality and prevent supply chain interruption.

Q: Are package dimensions identical across all three parts?

A: Yes. All three parts use 16-SOIC packaging with identical dimensions (0.209", 5.30mm width). No PCB layout modifications are required for substitution.

Q: Do the substitute parts meet RoHS3 compliance?

A: Yes. Both SN74HC151ANSR and SN74HC251ANSR are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original SN74HC151ANS specifications.

Q: What is the supply voltage compatibility range?

A: All three parts operate with single supply voltage in the range of 2V ~ 6V. This specification is identical across SN74HC151ANS, SN74HC151ANSR, and SN74HC251ANSR.

Q: Can these parts be used in temperature-critical applications?

A: Yes. All three parts support the operating temperature range of -40°C ~ 85°C, suitable for industrial and commercial temperature environments.