SN74LS193NSR Equivalent & Substitute Parts

Part Overview

The SN74LS193NSR is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous up/down counting applications. This device features positive edge triggering, asynchronous reset, and operates at a maximum count rate of 32 MHz within a supply voltage range of 4.75 V to 5.25 V. The part is currently in active production status and is RoHS3 compliant.

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements permit alternative packaging or manufacturer options while maintaining functional equivalence.

Substiute Parts

SN74LS193NSR

Texas InstrumentsIn Stock: 695SN74LS193NSR Datasheet

Current PartRFQ

SN74LS193D

onsemiIn Stock: 16628SN74LS193D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LS193NSR is determined by the following critical parameters:

• Logic Type: Binary Counter (must match exactly)
• Number of Bits per Element: 4 (must match exactly)
• Direction: Up, Down (must match exactly)
• Reset Type: Asynchronous (must match exactly)
• Timing: Synchronous (must match exactly)
• Count Rate: 32 MHz (must match exactly)
• Trigger Type: Positive Edge (must match exactly)
• Voltage - Supply: 4.75 V ~ 5.25 V (must match exactly)
• Operating Temperature: 0°C ~ 70°C (must match exactly)
• Mounting Type: Surface Mount (must match exactly)
• Package / Case: 16-SOIC (must match exactly)
• Base Product Number: 74LS193 (must match exactly)

The SN74LS193D from onsemi meets all functional and electrical requirements for direct substitution. Packaging differences (Tape & Reel versus Tube) represent distribution format variations that do not affect component performance or circuit integration.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS193NSR is the preferred selection for new designs due to its active product status and RoHS3 compliance. This part is suitable for applications requiring regulatory compliance with modern environmental standards and long-term supply availability.

The SN74LS193D is functionally equivalent but carries obsolete product status and does not meet RoHS compliance requirements. This part should be considered only for legacy system maintenance or applications where RoHS compliance is not mandated. The physical package dimensions differ slightly between the two parts (0.209" versus 0.154" width), which may affect PCB layout considerations in space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS193D be used as a direct replacement for the SN74LS193NSR in new designs?

A: The SN74LS193D is functionally equivalent and electrically compatible. However, the SN74LS193NSR is preferred for new designs due to active product status and RoHS3 compliance. The SN74LS193D is obsolete and non-compliant with current environmental regulations.

Q: What are the physical package differences between these parts?

A: Both parts use 16-SOIC packaging. The SN74LS193NSR has a package width of 0.209" (5.30mm), while the SN74LS193D has a width of 0.154" (3.90mm). These dimensional differences may require PCB layout verification if switching between parts in existing designs.

Q: Are there any electrical performance differences between the SN74LS193NSR and SN74LS193D?

A: No. Both parts share identical electrical specifications including 32 MHz count rate, 4.75 V to 5.25 V supply voltage range, 0°C to 70°C operating temperature, and all functional characteristics (4-bit binary counter, up/down direction, asynchronous reset, positive edge trigger, synchronous timing).

Q: What is the significance of the product status difference?

A: Active status indicates the SN74LS193NSR is in current production with ongoing manufacturer support and supply availability. Obsolete status for the SN74LS193D indicates the part is no longer manufactured and existing inventory is limited.

Q: Does RoHS compliance affect circuit functionality?

A: RoHS compliance does not affect electrical performance or circuit functionality. It indicates the part meets environmental standards for hazardous substance restrictions. RoHS3 compliance of the SN74LS193NSR ensures compatibility with modern procurement and regulatory requirements.