SN74LS93DR Equivalent & Substitute Parts

Part Overview

The SN74LS93DR is a 4-bit binary counter IC manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This component functions as a negative edge-triggered counter with asynchronous reset capability, operating at a maximum count rate of 42 MHz. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical specifications and package compatibility to ensure direct replacement without circuit redesign.

Substiute Parts

SN74LS93DR

Texas InstrumentsIn Stock: 10426SN74LS93DR Datasheet

Current PartRFQ

SN74LS93D

Texas InstrumentsIn Stock: 1195SN74LS93D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS93DR is based on strict equivalence across the following critical parameters:

• Logic Function: Binary counter with identical 4-bit configuration and up-counting direction
• Electrical Characteristics: Matching supply voltage range (4.75 V ~ 5.25 V), count rate (42 MHz), and trigger mechanism (negative edge)
• Reset Behavior: Asynchronous reset functionality
• Package Compatibility: 14-SOIC surface mount package with identical pin configuration
• Series Alignment: 74LS logic family designation

The SN74LS93D qualifies as a direct substitute based on complete alignment with all specified parameters. The primary distinction is product status: the SN74LS93DR is obsolete, while the SN74LS93D maintains active production status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS93D is the direct equivalent for the SN74LS93DR. Both components are manufactured by Texas Instruments and maintain identical electrical and mechanical specifications. The SN74LS93D is preferred for new designs and production continuity due to its active product status, ensuring long-term availability and supply chain stability. Both parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. The transition from SN74LS93DR to SN74LS93D requires no circuit modifications, as pin configuration, electrical performance, and functional behavior are identical.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS93D directly replace the SN74LS93DR without circuit modification?

A: Yes. The SN74LS93D is a direct pin-for-pin and functionally equivalent replacement. All electrical parameters, package dimensions, and operational characteristics are identical.

Q: What is the primary reason for substitution?

A: The SN74LS93DR is classified as obsolete. The SN74LS93D maintains active production status, ensuring continued availability and supply chain reliability.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: Does the package type differ between these parts?

A: Both parts use the 14-SOIC surface mount package with identical dimensions (0.154", 3.90mm width). No PCB layout modifications are required.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution is based on matching logic type (4-bit binary counter), trigger mechanism (negative edge), reset behavior (asynchronous), count rate (42 MHz), supply voltage range (4.75 V ~ 5.25 V), operating temperature (0°C ~ 70°C), and package configuration (14-SOIC).