SN74LS163AD Equivalent & Substitute Parts

Part Overview

The SN74LS163AD is a 4-bit binary counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This synchronous counter operates at a maximum count rate of 25 MHz with positive edge triggering and synchronous reset functionality. The device is classified as Last Time Buy, indicating discontinued production status. Finding equivalent substitute parts is necessary to ensure continued availability for new designs and ongoing production support.

Substiute Parts

SN74LS163AD

Texas InstrumentsIn Stock: 1963SN74LS163AD Datasheet

Current PartRFQ

SN74LS163ADR

Texas InstrumentsIn Stock: 3151SN74LS163ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS163AD is determined by strict equivalence across the following critical parameters:

• Logic function: 4-bit binary counter with identical element count and bit width
• Electrical specifications: Synchronous timing, positive edge trigger, 25 MHz count rate capability
• Supply voltage: 4.75 V ~ 5.25 V operating range
• Temperature range: 0°C ~ 70°C
• Package format: 16-SOIC surface mount configuration with identical pinout
• Compliance: ROHS3 compliance and equivalent regulatory status

The SN74LS163ADR qualifies as a direct substitute based on matching all parameters above. The primary distinction is product status: SN74LS163ADR maintains Active status, providing continued availability and manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS163ADR is the direct equivalent substitute for the SN74LS163AD. Selection between these parts should be based on availability and product lifecycle requirements:

• For new designs and ongoing production: SN74LS163ADR is the preferred choice due to Active product status, ensuring long-term supply chain stability and manufacturing support.
• For legacy system maintenance: SN74LS163AD may be sourced from existing inventory (1937 pcs available) if immediate availability is required, though this part is designated Last Time Buy.
• Both parts maintain identical electrical performance, package configuration, and compliance certifications, ensuring direct functional interchangeability.

Frequently Asked Questions (FAQ)

Q: Can SN74LS163ADR be used as a direct replacement for SN74LS163AD?

A: Yes. Both parts are electrically and mechanically identical. They share the same pinout, package dimensions, electrical specifications, and operating parameters. The primary difference is product status: SN74LS163ADR is in active production while SN74LS163AD is Last Time Buy.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 16-SOIC package with identical 0.154" width and 3.90mm dimensions. Pin configuration and functionality are identical.

Q: What does Last Time Buy status mean for the SN74LS163AD?

A: Last Time Buy indicates the manufacturer has discontinued production. Existing inventory may be available, but no new manufacturing runs are planned. The Active status of SN74LS163ADR ensures continued availability for future orders.

Q: Are both parts RoHS compliant?

A: Yes. Both SN74LS163AD and SN74LS163ADR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. Identical package, pinout, and electrical specifications allow direct substitution without PCB redesign or layout modifications.