SN75C189D Equivalent & Substitute Parts

Part Overview

The SN75C189D is a 0/4 Receiver RS232 interface IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. The SN75C189D operates within a 4.5V to 6V supply voltage range and maintains a receiver hysteresis of 330 mV, making it suitable for RS232 communication applications requiring reliable signal reception.

Due to Last Time Buy status and finite inventory availability (3630 Pcs), identifying equivalent substitute parts is essential for long-term design continuity and procurement planning.

Substiute Parts

SN75C189D

Texas InstrumentsIn Stock: 3724SN75C189D Datasheet

Current PartRFQ

SN75C189DR

Texas InstrumentsIn Stock: 61336SN75C189DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75C189D is determined by strict equivalence across the following critical parameters:

• Protocol specification: RS232
• Receiver configuration: 0/4 (zero drivers, four receivers)
• Receiver hysteresis: 330 mV
• Supply voltage range: 4.5V ~ 6V
• Operating temperature range: 0°C ~ 70°C
• Package type: 14-SOIC surface mount
• Electrical and mechanical pin compatibility

The SN75C189DR qualifies as a direct substitute based on identical electrical specifications, package geometry, and functional characteristics. The primary distinction is packaging format: the SN75C189D is supplied in Tube packaging, while the SN75C189DR is supplied in Tape & Reel (TR) format. Both parts share the same base product number (75C189) and maintain full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN75C189DR is the direct equivalent substitute for the SN75C189D. Both parts are manufactured by Texas Instruments and maintain identical electrical specifications, functional characteristics, and package geometry. The SN75C189DR carries Active product status, ensuring continued availability and long-term supply security compared to the Last Time Buy status of the SN75C189D.

Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, confirming regulatory and environmental equivalence. The substitution is suitable for new designs and redesigns requiring RS232 receiver functionality with 0/4 configuration.

The only operational difference is packaging format: Tube versus Tape & Reel. This distinction affects procurement, handling, and automated assembly processes but does not impact electrical performance or component functionality.

Frequently Asked Questions (FAQ)

Q: Can the SN75C189DR be used as a direct replacement for the SN75C189D in existing designs?

A: Yes. The SN75C189DR is electrically and mechanically identical to the SN75C189D. Pin configuration, electrical specifications, and functional performance are equivalent. No circuit modifications are required.

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

A: Tube packaging supplies components in plastic tubes suitable for manual handling and small-quantity applications. Tape & Reel packaging supplies components on continuous tape wound on reels, optimized for automated pick-and-place assembly. Both formats contain identical components with no electrical differences.

Q: Why is the SN75C189D marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this part number. Existing inventory is available for purchase, but no future production is planned. The SN75C189DR, with Active status, represents the recommended long-term alternative.

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

A: No. Both the SN75C189D and SN75C189DR maintain identical RoHS3 compliance, REACH status, and moisture sensitivity ratings. Regulatory and environmental certifications are equivalent.

Q: What supply voltage range does the SN75C189D support?

A: The SN75C189D operates within a 4.5V to 6V supply voltage range, consistent with RS232 receiver specifications for this device class.

Q: Is the 14-SOIC package suitable for surface mount assembly?

A: Yes. The 14-SOIC package is a standard surface mount package with 0.154" (3.90mm) width. Both the SN75C189D and SN75C189DR are compatible with automated surface mount assembly processes.