SN74LS148NS Equivalent & Substitute Parts

Part Overview

The SN74LS148NS is a priority encoder integrated circuit manufactured by Texas Instruments, currently in Last Time Buy status. This component is a 16-pin DIP package device designed for priority encoding applications. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term supply chain planning. The SN74LS148NSR provides a direct functional equivalent with enhanced availability and active product status.

Substiute Parts

SN74LS148NS

Texas InstrumentsIn Stock: 1053SN74LS148NS Datasheet

Current PartRFQ

SN74LS148NSR

Texas InstrumentsIn Stock: 2782SN74LS148NSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS148NS is determined by the following critical parameters:

• Functional Type: Priority Encoder 1 x 8:3 configuration
• Logic Family: 74LS series
• Electrical Specifications: Voltage supply 4.75V ~ 5.25V, operating temperature 0°C ~ 70°C
• Output Characteristics: Current output 400µA (high), 8mA (low)
• Compliance Requirements: ROHS3 compliant, REACH unaffected, MSL Level 1

The SN74LS148NSR qualifies as a direct substitute based on identical functional specifications, matching electrical parameters, and equivalent compliance certifications. The primary distinction is packaging format and product lifecycle status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS148NSR is the direct functional equivalent for the SN74LS148NS. Both components meet identical electrical specifications, compliance requirements, and operational parameters. Selection between these parts should be based on:

• Product Lifecycle: The SN74LS148NSR maintains Active status, ensuring long-term availability and support, whereas the SN74LS148NS is in Last Time Buy status.
• Compliance Alignment: Both parts are ROHS3 compliant and REACH unaffected, suitable for regulated applications.
• Inventory Availability: The SN74LS148NSR has higher current inventory (2761 Pcs) compared to the SN74LS148NS (1024 Pcs).
• Packaging Consideration: The SN74LS148NSR is supplied in Tape & Reel format, standard for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS148NSR directly replace the SN74LS148NS in existing designs?

A: Yes. Both components are functionally identical priority encoders with matching electrical specifications, voltage supply ranges (4.75V ~ 5.25V), output current characteristics (400µA, 8mA), and operating temperature ranges (0°C ~ 70°C). They share identical package dimensions (16-SOIC, 0.209" width, 5.30mm).

Q: What is the significance of the Last Time Buy status for the SN74LS148NS?

A: Last Time Buy status indicates that the manufacturer will no longer accept new orders after a specified date. Transitioning to the SN74LS148NSR ensures continued supply chain access and product support.

Q: Are there any compliance differences between these parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (Unlimited) moisture sensitivity ratings.

Q: Does packaging format affect electrical performance?

A: No. The packaging format difference (DIP versus Tape & Reel) does not affect electrical performance or functional characteristics. The difference is in supply and handling format only.

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

A: Substitution is determined by matching functional type (Priority Encoder 1 x 8:3), logic family (74LS series), voltage supply specifications (4.75V ~ 5.25V), output current ratings (400µA, 8mA), operating temperature range (0°C ~ 70°C), and compliance certifications (ROHS3, REACH, MSL Level 1).