SN55189AJ RS232 Receiver Interface IC - Equivalent & Substitute Parts

Part Overview

The SN55189AJ is a 0/4 Receiver RS232 interface integrated circuit manufactured by Texas Instruments, housed in a 14-CDIP package. This component functions as an RS232 receiver for serial communication applications requiring industrial-grade temperature operation from -55°C to 125°C. The SN55189AJ maintains Active product status with 2047 units currently in stock.

Substitute parts become necessary when the SN55189AJ reaches end-of-life status, when alternative packaging formats are required for specific assembly processes, or when operating temperature ranges differ from application requirements. The SN75189AN represents the primary equivalent substitute, offering identical functional specifications with modified environmental and packaging characteristics.

Substiute Parts

SN55189AJ

Texas InstrumentsIn Stock: 2118SN55189AJ Datasheet

Current PartRFQ

SN75189AN

Texas InstrumentsIn Stock: 17005SN75189AN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN55189AJ is determined by strict alignment across the following parameters:

Protocol Compatibility: The substitute must implement RS232 serial communication protocol without deviation.

Receiver Configuration: The 0/4 receiver channel configuration (zero drivers, four receivers) is mandatory. Substitutes with different driver/receiver ratios are not functionally equivalent.

Supply Voltage Range: The 4.5V to 5.5V supply voltage window must be maintained. Substitutes operating at different voltage ranges introduce circuit redesign requirements.

Data Rate Capability: The 1 Mbps data rate specification establishes minimum performance requirements. Substitutes must support this rate or higher.

Package Form Factor: The 14-CDIP through-hole package defines physical compatibility with existing PCB designs. Package variations require board redesign.

Regulatory Compliance: ROHS3 compliance status ensures environmental and material standards alignment.

The SN75189AN qualifies as a substitute based on matching protocol, receiver configuration, supply voltage, and compliance status. However, differences in operating temperature range and product status require engineering evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

For Active Production Applications:

Select the SN55189AJ when designing new systems or maintaining active production lines. The Active product status ensures long-term availability and consistent manufacturing processes. The extended operating temperature range (-55°C to 125°C) qualifies this component for industrial, automotive, and military-grade applications requiring temperature extremes.

For Legacy System Maintenance:

The SN75189AN serves as a functional substitute for existing systems currently operating within the 0°C to 70°C commercial temperature range. The Last Time Buy status indicates limited future availability; procurement should prioritize the higher current inventory (16960 units) if this substitute is selected for ongoing support.

Temperature Range Considerations:

Applications requiring operation below 0°C or above 70°C must use the SN55189AJ. The SN75189AN is not suitable for these extended temperature environments. Verify actual operating conditions before selecting the substitute.

Package Compatibility:

Both components use 14-pin DIP through-hole packages with identical 0.300" (7.62mm) pitch. The CDIP versus PDIP variant difference does not affect PCB footprint compatibility or soldering procedures. Existing board designs accept either variant without modification.

Compliance Status:

Both parts maintain ROHS3 compliance, ensuring equivalent environmental and material standards. No additional compliance verification is required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can the SN75189AN directly replace the SN55189AJ in all applications?

A: Direct replacement is possible only for applications operating within the 0°C to 70°C temperature range. Applications requiring operation at -55°C to -1°C or 71°C to 125°C must use the SN55189AJ. Verify your system's actual operating temperature before substitution.

Q: What is the difference between 14-CDIP and 14-DIP packaging?

A: Both are 14-pin dual inline packages with identical 0.300" pitch and through-hole mounting. CDIP (Ceramic DIP) and PDIP (Plastic DIP) refer to the package material. For PCB layout and assembly purposes, they are mechanically and electrically interchangeable.

Q: Why is the SN75189AN listed as "Last Time Buy" if it has higher inventory?

A: Last Time Buy status indicates Texas Instruments has discontinued active manufacturing of this part. The current high inventory (16960 units) represents remaining stock from final production runs. Once depleted, this part will become unavailable. The SN55189AJ, with Active status, represents the current production alternative.

Q: Are the RS232 communication specifications identical between these parts?

A: Yes. Both components implement identical RS232 protocol with 0/4 receiver configuration and 4.5V to 5.5V supply voltage. The 1 Mbps data rate specification applies to the SN55189AJ; the SN75189AN does not specify a data rate limit but supports RS232 standard operation.

Q: What supply voltage range do these components require?

A: Both the SN55189AJ and SN75189AN operate with identical 4.5V to 5.5V supply voltage range. This standard 5V logic supply voltage is compatible with conventional TTL and CMOS digital circuits.

Q: Can I use the SN75189AN in a new design?

A: Not recommended. The Last Time Buy status and limited future availability make the SN75189AN unsuitable for new designs. Use the SN55189AJ for all new development to ensure long-term component availability and manufacturing consistency.

Q: Are there any electrical performance differences between these receivers?

A: Based on provided specifications, both components implement identical RS232 receiver functionality with matching supply voltage and channel configuration. No electrical performance differences are documented in the provided parameters.