SN75189N Equivalent & Substitute Parts

Part Overview

The SN75189N is a 0/4 Receiver RS232 interface IC manufactured by Texas Instruments in a 14-DIP through-hole package. This component is classified as Last Time Buy, indicating end-of-life status. The SN75189N operates within a supply voltage range of 4.5V to 5.5V and supports operating temperatures from 0°C to 70°C. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

SN75189N

Texas InstrumentsIn Stock: 3189SN75189N Datasheet

Current PartRFQ

SN75C189ANSR

Texas InstrumentsIn Stock: 6425SN75C189ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SN75C189ANSR qualifies as a direct functional substitute for the SN75189N based on the following critical parameters:

• Protocol Match: Both components implement RS232 receiver functionality
• Receiver Configuration: Both feature 0/4 driver/receiver configuration
• Supply Voltage Compatibility: SN75C189ANSR operates at 4.5V ~ 6V, which encompasses the SN75189N operating range of 4.5V ~ 5.5V
• Operating Temperature Range: Both support 0°C ~ 70°C operation
• Regulatory Compliance: Both are ROHS3 Compliant and REACH Unaffected

The primary difference is the package format: SN75189N uses through-hole 14-DIP mounting, while SN75C189ANSR uses surface-mount 14-SOIC packaging. This substitution requires PCB redesign to accommodate the different mounting technology.

Parameter Comparison

Engineering Selection Recommendations

The SN75C189ANSR is the manufacturer-recommended substitute for the SN75189N. Both components maintain identical functional specifications for RS232 receiver operation and meet the same regulatory requirements (ROHS3 Compliant, REACH Unaffected).

Selection between these parts depends on PCB design constraints:

• SN75189N: Retain for existing through-hole designs where PCB layout cannot be modified
• SN75C189ANSR: Select for new designs or redesigned boards requiring surface-mount technology, offering improved space efficiency and active product status

The SN75C189ANSR's active product status provides extended availability and supply chain stability compared to the Last Time Buy status of the SN75189N.

Frequently Asked Questions (FAQ)

Q: Can SN75C189ANSR directly replace SN75189N without circuit modifications?

A: Functional operation is compatible; however, PCB layout redesign is required due to different mounting technologies (through-hole versus surface-mount) and package footprints.

Q: Are the electrical specifications identical between these parts?

A: Core RS232 receiver specifications are functionally equivalent. The SN75C189ANSR operates at a slightly higher maximum supply voltage (6V versus 5.5V) and specifies receiver hysteresis at 970 mV. Both operate within the same temperature range and support identical protocol functionality.

Q: What is the significance of the Last Time Buy status for SN75189N?

A: Last Time Buy indicates the manufacturer will no longer produce this part after a specified date. Existing inventory may be available, but long-term supply cannot be guaranteed. The SN75C189ANSR, with Active status, provides continued manufacturing support.

Q: Are packaging and compliance certifications compatible?

A: Both parts are ROHS3 Compliant and REACH Unaffected, meeting identical regulatory requirements. Moisture Sensitivity Level differs (Not Applicable for SN75189N; Level 1 for SN75C189ANSR), requiring appropriate handling procedures for the surface-mount variant.

Q: What are the physical footprint differences?

A: SN75189N uses a 14-DIP package measuring 0.300" (7.62mm) for through-hole mounting. SN75C189ANSR uses a 14-SOIC package measuring 0.209" (5.30mm) width for surface-mount application. These require different PCB pad layouts and assembly processes.