SN74LS193D Equivalent & Substitute Parts

Part Overview

The SN74LS193D is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous counting applications with both up and down counting capability. This component operates at a maximum count rate of 32 MHz with asynchronous reset functionality and is housed in a 16-SOIC surface mount package. The SN74LS193D is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term component availability.

Substiute Parts

SN74LS193D

Texas InstrumentsIn Stock: 960SN74LS193D Datasheet

Current PartRFQ

SN74LS193DR

Texas InstrumentsIn Stock: 3255SN74LS193DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS193D is determined by strict equivalence across the following critical parameters: logic type (binary counter), bit width (4-bit), counting direction (up/down capability), count rate (32 MHz minimum), trigger type (positive edge), reset method (asynchronous), timing architecture (synchronous), supply voltage range (4.75 V ~ 5.25 V), operating temperature range (0°C ~ 70°C), and physical package specification (16-SOIC). The substitute part must maintain identical electrical characteristics and pin-compatible packaging to ensure direct replacement without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS193DR serves as the direct substitute for the SN74LS193D. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, pin configuration, and package dimensions. The primary distinction is packaging format: the SN74LS193D is supplied in Tube packaging, while the SN74LS193DR is supplied in Tape & Reel (TR) format. Both parts carry Active product status for the substitute versus Last Time Buy for the main part, ensuring continued availability. Compliance certifications including ROHS3 and REACH Unaffected status are equivalent across both parts. Selection between these parts depends on procurement requirements and assembly process compatibility with the respective packaging formats.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS193DR directly replace the SN74LS193D in existing designs?

A: Yes. The SN74LS193DR is electrically and functionally identical to the SN74LS193D. Both parts share the same pin configuration, electrical characteristics, and 16-SOIC package dimensions. Direct substitution requires no circuit modifications.

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

A: Tube packaging is used for manual handling and smaller quantity orders, while Tape & Reel packaging is optimized for automated assembly processes. The components themselves are identical; the difference is in delivery and handling format.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both the SN74LS193D and SN74LS193DR maintain identical RoHS3 compliance, REACH Unaffected status, and moisture sensitivity ratings. Regulatory and environmental compliance is equivalent.

Q: Why is the SN74LS193D marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74LS193DR remains in Active status and represents the current production equivalent for new designs and ongoing supply requirements.

Q: What are the critical parameters for substitution compatibility?

A: Substitution compatibility is determined by matching logic type (binary counter), bit width (4-bit), counting direction (up/down), count rate (32 MHz), trigger type (positive edge), reset method (asynchronous), supply voltage (4.75 V ~ 5.25 V), operating temperature range (0°C ~ 70°C), and package specification (16-SOIC). All parameters must align for direct replacement.