SN74LS593DW Equivalent & Substitute Parts

Part Overview

The SN74LS593DW is an 8-bit binary counter IC manufactured by Texas Instruments, housed in a 20-SOIC surface mount package. This logic component functions as a positive edge-triggered counter with synchronous reset capability and a maximum count rate of 35 MHz. The device operates within a 4.75 V to 5.25 V supply voltage range and is rated for 0°C to 70°C operating temperature.

The SN74LS593DW carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production. This status necessitates identification of equivalent substitute parts to ensure continued component availability for new designs, repairs, and production continuity.

Substiute Parts

SN74LS593DW

Texas InstrumentsIn Stock: 1303SN74LS593DW Datasheet

Current PartRFQ

SN74LS593DWR

Texas InstrumentsIn Stock: 943SN74LS593DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS593DW is determined by strict equivalence across the following critical parameters:

• Logic Type: Binary Counter (identical functional classification)
• Number of Bits per Element: 8 Bit (identical bit width)
• Direction: Up (identical counting direction)
• Reset Type: Synchronous (identical reset mechanism)
• Trigger Type: Positive Edge (identical edge sensitivity)
• Count Rate: 35 MHz (identical maximum frequency)
• Voltage - Supply: 4.75 V ~ 5.25 V (identical supply voltage range)
• Operating Temperature: 0°C ~ 70°C (identical temperature range)
• Package / Case: 20-SOIC (identical physical package)
• Mounting Type: Surface Mount (identical mounting method)

The SN74LS593DWR qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications. The only distinction between these parts is packaging format: the main part uses Tube packaging, while the substitute uses Tape & Reel (TR) packaging. Both formats contain identical die and electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS593DWR is a direct functional and electrical equivalent to the SN74LS593DW. Selection between these parts should be based on the following criteria:

SN74LS593DWR (Recommended for New Designs): This part carries Active product status from Texas Instruments, ensuring continued availability and manufacturing support. It maintains identical electrical specifications and package dimensions. The Tape & Reel packaging format is standard for automated assembly processes and high-volume production environments. Both parts meet ROHS3 compliance and REACH requirements.

SN74LS593DW (Legacy Applications): This part is suitable only for existing designs already qualified to this specific part number and packaging format. The Last Time Buy status indicates limited remaining inventory; procurement should prioritize the Active substitute for long-term supply chain stability.

Both parts are ROHS3 Compliant with MSL Level 1 (Unlimited moisture sensitivity), indicating robust handling characteristics suitable for standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS593DWR replace the SN74LS593DW in existing designs?

A: Yes. The SN74LS593DWR is electrically and functionally identical to the SN74LS593DW. Both devices share the same die, pin configuration, electrical performance, and 20-SOIC package dimensions. The only difference is packaging format (Tube versus Tape & Reel).

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

A: Tube packaging contains loose components in a plastic tube, typically used for manual assembly or small-quantity applications. Tape & Reel packaging places components on a continuous carrier tape wound on a reel, designed for automated pick-and-place assembly equipment. Both formats contain identical components with identical electrical characteristics.

Q: Why is the SN74LS593DW marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has ceased active production of this part number. Existing inventory is being sold through distribution channels until depletion. The SN74LS593DWR (Active status) is the recommended long-term alternative.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts operate at 35 MHz maximum count rate, support 4.75 V to 5.25 V supply voltage, and function across 0°C to 70°C operating temperature. All functional parameters are identical.

Q: Can I use these parts interchangeably on the same PCB assembly?

A: Yes, provided your assembly process accommodates the packaging format. If your production line uses automated Tape & Reel equipment, the SN74LS593DWR is the appropriate choice. If manual placement or Tube-compatible equipment is used, either part is suitable. Pin-to-pin compatibility is complete.

Q: What compliance certifications apply to both parts?

A: Both the SN74LS593DW and SN74LS593DWR are ROHS3 Compliant and REACH Unaffected. Both carry MSL Level 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling.