SN74S151N Equivalent & Substitute Parts

Part Overview

The SN74S151N is a 1 x 8:1 multiplexer logic IC manufactured by Texas Instruments in a 16-DIP package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The SN74S151N operates with single supply voltage and is suitable for applications requiring high-speed data selection from eight input lines.

Substiute Parts

SN74S151N

Texas InstrumentsIn Stock: 2840SN74S151N Datasheet

Current PartRFQ

SN74AS151N

Texas InstrumentsIn Stock: 2356SN74AS151N Datasheet

DirectRFQ

SN74F151BN

Texas InstrumentsIn Stock: 1719SN74F151BN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74S151N is determined by the following critical parameters:

• Functional equivalence: 1 x 8:1 multiplexer configuration with identical pin count and function
• Package compatibility: 16-DIP (0.300", 7.62mm) through-hole mounting
• Voltage supply range: Single supply operation within acceptable tolerance bands
• Operating temperature range: 0°C ~ 70°C compatibility
• Output current specifications: Compatibility with downstream circuit requirements
• Compliance certifications: RoHS3 compliance and REACH unaffected status

The SN74AS151N and SN74F151BN meet these substitution criteria. Both are active products from Texas Instruments in the same package with identical circuit configuration and compatible electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

SN74AS151N is recommended as the primary substitute for the SN74S151N. This part maintains active product status with ROHS3 compliance and REACH unaffected certification. The voltage supply range of 4.5V ~ 5.5V provides broader tolerance than the original part, and output current specifications of 2.6mA high and 24mA low are compatible with standard TTL logic circuits.

SN74F151BN serves as an alternative substitute with identical output high current (1mA) to the original SN74S151N, while providing increased output low current (24mA). This part is also active and fully compliant with RoHS3 and REACH requirements.

Both substitutes are available in the same 16-DIP package with identical pinout and functional configuration, enabling direct replacement in through-hole PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS151N directly replace the SN74S151N without PCB modifications?

A: Yes. Both parts use the 16-DIP (0.300", 7.62mm) package with identical pinout and 1 x 8:1 multiplexer configuration. No PCB layout changes are required.

Q: What is the difference between the 74S, 74AS, and 74F series?

A: These designations indicate different logic families within the TTL technology. The 74S is Schottky, 74AS is Advanced Schottky, and 74F is FAST (Fairchild Advanced Schottky Technology). All three families are functionally equivalent for this multiplexer application and operate within compatible voltage and temperature ranges.

Q: Are there voltage supply compatibility concerns when substituting?

A: The SN74S151N operates at 4.75V ~ 5.25V, while both substitutes operate at 4.5V ~ 5.5V. The substitute parts accept a wider voltage range, ensuring compatibility with standard 5V supply systems. No circuit modifications are necessary.

Q: Which substitute should be selected for new designs?

A: The SN74AS151N is the recommended choice for new designs due to its active product status and broader voltage tolerance. The SN74F151BN is equally suitable if output current characteristics better match specific circuit requirements.

Q: Are both substitutes RoHS3 compliant?

A: Yes. Both the SN74AS151N and SN74F151BN are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.