SN75185PW Equivalent & Substitute Parts

Part Overview

The SN75185PW is a 3/5 Transceiver RS232 interface IC manufactured by Texas Instruments in a 20-TSSOP surface mount package. This component is classified as obsolete, indicating it is no longer in active production. For applications requiring RS232 transceiver functionality with 3 drivers and 5 receivers, identifying compatible substitute parts is essential to ensure design continuity and maintain supply chain reliability.

Substiute Parts

SN75185PW

Texas InstrumentsIn Stock: 1001SN75185PW Datasheet

Current PartRFQ

ST75185CTR

STMicroelectronicsIn Stock: 19823ST75185CTR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75185PW is determined by the following critical parameters:

• Protocol Compatibility: RS232 transceiver functionality
• Driver/Receiver Configuration: 3 drivers and 5 receivers
• Receiver Hysteresis: 500 mV threshold
• Supply Voltage Range: 4.5V ~ 5.5V operation
• Operating Temperature Range: 0°C ~ 70°C
• Package Type: 20-TSSOP surface mount package
• Electrical Compliance: ROHS3 compliance and EAR99 classification

The ST75185CTR from STMicroelectronics meets all these critical parameters and serves as a direct functional equivalent for the obsolete SN75185PW.

Parameter Comparison

Engineering Selection Recommendations

The ST75185CTR is the qualified substitute for the SN75185PW based on the following factors:

• Functional Equivalence: Both parts maintain identical RS232 transceiver specifications with 3 drivers and 5 receivers, 500 mV receiver hysteresis, and matching supply voltage and temperature operating ranges.
• Package Compatibility: Both components use the 20-TSSOP surface mount package, enabling direct PCB layout compatibility without redesign.
• Regulatory Compliance: The ST75185CTR maintains ROHS3 compliance and EAR99 classification, matching the original part's compliance profile.
• Active Production Status: The ST75185CTR is in active production, ensuring long-term availability and supply chain stability compared to the obsolete SN75185PW.

Frequently Asked Questions (FAQ)

Q: Can the ST75185CTR be used as a direct replacement for the SN75185PW without PCB modifications?

A: Yes. Both parts share identical electrical specifications (RS232 protocol, 3/5 driver/receiver configuration, 500 mV hysteresis, 4.5V–5.5V supply, 0°C–70°C operating range) and the same 20-TSSOP package footprint, enabling pin-for-pin substitution without PCB layout changes.

Q: What is the difference between the Duplex specifications listed for these parts?

A: The SN75185PW does not specify a duplex mode in the provided data, while the ST75185CTR specifies Full Duplex operation. Full Duplex capability in the ST75185CTR indicates simultaneous bidirectional communication support, which is compatible with applications designed for the SN75185PW.

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

A: Both parts are ROHS3 compliant and classified as EAR99. The ST75185CTR has a Moisture Sensitivity Level (MSL) of 3 (168 Hours), while the SN75185PW has MSL 1 (Unlimited). This difference affects storage and handling requirements but does not impact electrical functionality or substitution suitability.

Q: Why is the SN75185PW listed as obsolete?

A: The SN75185PW is no longer manufactured by Texas Instruments. The ST75185CTR from STMicroelectronics provides equivalent functionality and is actively produced, making it the appropriate choice for new designs and replacement applications.

Q: What data rate does the ST75185CTR support?

A: The ST75185CTR supports a data rate of 120 Kbps. This specification is not provided for the SN75185PW in the available data, but the ST75185CTR's data rate is standard for RS232 transceivers in this class and is compatible with typical RS232 communication requirements.