SN75189APWR Equivalent & Substitute Parts

Part Overview

The SN75189APWR is a 0/4 Receiver RS232 interface IC manufactured by Texas Instruments in a 14-TSSOP surface mount package. This component is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The SN75189APWR operates within a 4.5V to 5.5V supply voltage range and supports standard RS232 protocol communication. Due to its Last Time Buy status, identifying compatible substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

SN75189APWR

Texas InstrumentsIn Stock: 4441SN75189APWR Datasheet

Current PartRFQ

SN75C189ANSR

Texas InstrumentsIn Stock: 6425SN75C189ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75189APWR is determined by the following critical parameters:

• Protocol compatibility: RS232 standard
• Functional configuration: 0/4 Receiver (4 receiver channels, 0 driver channels)
• Supply voltage range: Minimum 4.5V operation required
• Operating temperature range: 0°C to 70°C
• Mounting type: Surface mount technology
• RoHS compliance: ROHS3 Compliant status
• Moisture sensitivity: MSL 1 rating

The SN75C189ANSR qualifies as a manufacturer-recommended substitute based on matching protocol, receiver configuration, supply voltage compatibility, temperature range, mounting type, and compliance certifications. Package geometry differences (14-TSSOP versus 14-SOIC) require PCB layout verification but do not affect electrical functionality.

Parameter Comparison

Engineering Selection Recommendations

The SN75C189ANSR is the manufacturer-recommended substitute for the SN75189APWR. Both components maintain ROHS3 compliance and MSL 1 ratings, ensuring equivalent environmental and regulatory standing. The substitute part carries Active product status, providing long-term availability and production support compared to the Last Time Buy status of the original part.

The primary design consideration is package footprint transition from 14-TSSOP to 14-SOIC. The SOIC package is 0.209 inches wide compared to the TSSOP at 0.173 inches. PCB layout modifications are required to accommodate the larger package outline. Pin-to-pin electrical compatibility is maintained, allowing direct functional substitution following physical layout adjustments.

The SN75C189ANSR extends the supply voltage range to 6V maximum, providing additional operational margin beyond the original 5.5V specification. Operating temperature range remains identical at 0°C to 70°C.

Frequently Asked Questions (FAQ)

Q: Can the SN75C189ANSR directly replace the SN75189APWR without PCB modifications?

A: Electrical functionality is directly compatible. Physical PCB layout modifications are required due to package geometry differences. The 14-SOIC package is larger than the 14-TSSOP package, necessitating footprint redesign.

Q: Are there differences in RS232 protocol support between these parts?

A: Both parts implement identical RS232 receiver functionality with 0/4 configuration (4 receiver channels, 0 driver channels). Protocol compatibility is complete.

Q: What is the significance of the extended voltage range in the substitute part?

A: The SN75C189ANSR operates to 6V maximum supply voltage compared to 5.5V for the SN75189APWR. This provides additional design margin but does not affect compatibility with 4.5V to 5.5V applications.

Q: Does the substitute part maintain the same moisture sensitivity rating?

A: Yes. Both parts carry MSL 1 (Unlimited) rating, indicating identical moisture sensitivity handling requirements.

Q: Why is the original part designated Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of the SN75189APWR. The SN75C189ANSR remains in Active production status, ensuring continued availability for new designs and production support.

Q: Are compliance certifications identical between the two parts?

A: Yes. Both parts are ROHS3 Compliant, REACH Unaffected, and carry identical ECCN and HTSUS classifications.