SN74LS151D Equivalent & Substitute Parts

Part Overview

The SN74LS151D is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited availability. The SN74LS151D operates on single supply voltage and is commonly used in digital signal routing and data selection applications. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term supply chain planning.

Substiute Parts

SN74LS151D

Texas InstrumentsIn Stock: 1368SN74LS151D Datasheet

Current PartRFQ

SN74LS151DR

Texas InstrumentsIn Stock: 3987SN74LS151DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS151D is determined by strict equivalence across the following parameters:

• Multiplexer circuit configuration (1 x 8:1)
• Number of independent circuits (1)
• Output current specifications (400µA high, 8mA low)
• Supply voltage range (4.75V ~ 5.25V)
• Operating temperature range (0°C ~ 70°C)
• Package and case dimensions (16-SOIC, 0.154" width, 3.90mm)
• Surface mount mounting type
• Compliance certifications (RoHS3, REACH Unaffected)

The SN74LS151DR meets all these criteria and is identified as the manufacturer-recommended substitute. The primary distinction between these parts is packaging format: the SN74LS151D is supplied in Tube packaging, while the SN74LS151DR is supplied in Tape & Reel format. Both parts share identical electrical specifications and pinout configuration.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS151DR is the direct functional equivalent of the SN74LS151D. Both parts are manufactured by Texas Instruments and maintain identical electrical characteristics, pinout configuration, and package dimensions. The SN74LS151DR is recommended for new designs and ongoing production due to its Active product status, ensuring continued availability and supply chain stability.

For existing designs currently using the SN74LS151D, the transition to SN74LS151DR requires no circuit modifications. The parts are pin-compatible and electrically interchangeable. The primary consideration is packaging format: Tube packaging (SN74LS151D) is suitable for lower-volume applications and manual assembly, while Tape & Reel packaging (SN74LS151DR) is optimized for automated pick-and-place assembly processes.

Both parts maintain full compliance with RoHS3 and REACH regulations, ensuring regulatory compatibility across applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS151DR be used as a direct replacement for the SN74LS151D?

A: Yes. The SN74LS151DR is electrically and functionally identical to the SN74LS151D. Both parts share the same pinout, electrical specifications, and 16-SOIC package dimensions. No circuit modifications are required for substitution.

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

A: Tube packaging supplies components in plastic tubes suitable for manual handling and lower-volume assembly. Tape & Reel packaging supplies components on continuous tape wound on reels, optimized for automated assembly equipment. Both formats contain the same component with identical specifications.

Q: Why is the SN74LS151D marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory may be available through authorized distributors, but long-term availability is not guaranteed. The SN74LS151DR, with Active status, is the recommended alternative for ongoing production.

Q: Are there any compliance differences between these parts?

A: No. Both the SN74LS151D and SN74LS151DR are ROHS3 Compliant and REACH Unaffected. They maintain identical regulatory compliance and are suitable for the same applications.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching the multiplexer configuration (1 x 8:1), output current specifications (400µA high, 8mA low), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and package type (16-SOIC surface mount). All these parameters are identical between the SN74LS151D and SN74LS151DR.