SN75C189AD Equivalent & Substitute Parts

Part Overview

The SN75C189AD 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 availability. The SN75C189AD operates within a 4.5V to 6V supply voltage range and maintains a receiver hysteresis of 970 mV, making it suitable for RS232 communication applications requiring reliable signal reception. Due to its Last Time Buy status and limited inventory, identifying equivalent substitute parts is essential for design continuity and long-term supply chain planning.

Substiute Parts

SN75C189AD

Texas InstrumentsIn Stock: 3198SN75C189AD Datasheet

Current PartRFQ

SN75C189ADR

Texas InstrumentsIn Stock: 6543SN75C189ADR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75C189AD is determined by strict equivalence across the following critical parameters:

• Protocol Compatibility: RS232 protocol requirement
• Functional Configuration: 0/4 Receiver (zero drivers, four receivers)
• Electrical Specifications: Receiver hysteresis of 970 mV, supply voltage range 4.5V ~ 6V
• Package Compatibility: 14-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm Width)
• Compliance Requirements: ROHS3 compliance, MSL Level 1

The SN75C189ADR qualifies as a direct substitute based on identical electrical characteristics, functional configuration, and package specifications. The primary distinction is packaging format: the SN75C189AD is supplied in Tube packaging (Last Time Buy status), while the SN75C189ADR is supplied in Tape & Reel format (Active product status).

Parameter Comparison

Engineering Selection Recommendations

The SN75C189ADR is a direct functional and electrical equivalent to the SN75C189AD. Both components share identical electrical specifications, functional configuration, and package geometry. The SN75C189ADR is the preferred selection for new designs and ongoing production due to its Active product status, ensuring continued availability and supply chain stability. Both parts maintain ROHS3 compliance and MSL Level 1 rating, meeting environmental and moisture sensitivity requirements.

For existing designs currently using the SN75C189AD in Tube packaging, transition to the SN75C189ADR in Tape & Reel format is supported without circuit modification, provided that assembly processes accommodate the alternative packaging format. The identical 14-SOIC package dimensions ensure mechanical compatibility on printed circuit boards.

Frequently Asked Questions (FAQ)

Q: Can the SN75C189ADR replace the SN75C189AD in existing designs?

A: Yes. The SN75C189ADR is electrically and functionally identical to the SN75C189AD. Both components feature the same 0/4 receiver configuration, 970 mV hysteresis, 4.5V to 6V supply voltage range, and 14-SOIC package dimensions. No circuit modifications are required for substitution.

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

A: Tube packaging (SN75C189AD) is used for lower-volume applications and manual assembly processes. Tape & Reel packaging (SN75C189ADR) is designed for automated pick-and-place assembly and higher-volume production. The components themselves are identical; only the packaging format differs.

Q: Why is the SN75C189AD marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory is available for purchase, but no future production is planned. The SN75C189ADR in Tape & Reel format remains in active production and is the recommended long-term alternative.

Q: Are there any compliance differences between these parts?

A: No. Both the SN75C189AD and SN75C189ADR maintain identical ROHS3 compliance, REACH Unaffected status, and MSL Level 1 rating. Compliance certifications are equivalent.

Q: Can I use the SN75C189ADR in high-volume automated assembly?

A: Yes. The Tape & Reel packaging of the SN75C189ADR is specifically designed for automated pick-and-place assembly systems, making it the appropriate choice for high-volume production environments.