SN74LS148DG4 Equivalent & Substitute Parts

Part Overview

The SN74LS148DG4 is a Priority Encoder 1 x 8:3 logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 8-to-3 priority encoding functionality.

Substiute Parts

SN74LS148DG4

Texas InstrumentsIn Stock: 712SN74LS148DG4 Datasheet

Current PartRFQ

SN74LS148DR

Texas InstrumentsIn Stock: 23171SN74LS148DR Datasheet

MFR RecommendedRFQ

SN74LS148D

Texas InstrumentsIn Stock: 3111SN74LS148D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74LS148DG4 are qualified based on identical electrical and mechanical parameters:

• Circuit configuration: 1 x 8:3 priority encoder
• Package type: 16-SOIC surface mount
• Voltage supply range: 4.75V ~ 5.25V
• Output current specifications: 400µA (high), 8mA (low)
• Operating temperature range: 0°C ~ 70°C
• RoHS3 compliance and MSL Level 1 rating
• Base product number: 74LS148 series

Substitutes differ only in packaging format (Tube vs. Tape & Reel) and product status (Last Time Buy vs. Active), which do not affect functional or electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

SN74LS148DR is the primary substitute for the SN74LS148DG4. Both parts share identical electrical specifications and package geometry. The SN74LS148DR carries Active product status, ensuring continued availability and supply chain stability compared to the Last Time Buy status of the original part. The packaging format difference (Tape & Reel vs. Tube) does not affect functional performance and is determined by procurement and assembly requirements.

SN74LS148D is a secondary substitute with identical electrical and mechanical specifications. This part maintains Last Time Buy status, similar to the original SN74LS148DG4, and is packaged in Tube format. Selection between SN74LS148DR and SN74LS148D should prioritize long-term supply availability and procurement logistics.

All three parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard surface mount assembly processes and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74LS148DR be used as a direct replacement for SN74LS148DG4?

A: Yes. Both parts are electrically and mechanically identical. The SN74LS148DR differs only in packaging format (Tape & Reel vs. Tube) and product status (Active vs. Last Time Buy). No circuit modifications are required.

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

A: Tube packaging is used for manual handling and smaller quantity orders. Tape & Reel packaging is designed for automated assembly equipment. Both formats contain the same component with identical electrical performance. Selection depends on assembly process requirements and order quantity.

Q: Why is the SN74LS148DG4 marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments will discontinue this specific part number variant. Customers should transition to active alternatives such as SN74LS148DR to ensure long-term supply availability.

Q: Are all three parts RoHS3 compliant?

A: Yes. SN74LS148DG4, SN74LS148DR, and SN74LS148D are all ROHS3 compliant with MSL Level 1 rating, meeting environmental and regulatory requirements for standard manufacturing processes.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the assembly process accommodates the packaging format. SN74LS148DR (Tape & Reel) is suitable for automated pick-and-place assembly. SN74LS148D and SN74LS148DG4 (Tube) are suitable for manual or semi-automated assembly. Electrical performance is identical across all three variants.