SN75185PWG4 Equivalent & Substitute Parts

Part Overview

The SN75185PWG4 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, which necessitates identification of active equivalent parts for ongoing design support and procurement. The device functions as a full-duplex RS232 transceiver suitable for serial communication applications requiring 3 drivers and 5 receivers in a compact form factor.

Substiute Parts

SN75185PWG4

Texas InstrumentsIn Stock: 1069SN75185PWG4 Datasheet

Current PartRFQ

ST75185CTR

STMicroelectronicsIn Stock: 19823ST75185CTR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN75185PWG4 is determined by strict equivalence across the following critical parameters:

• Protocol: RS232
• Number of Drivers/Receivers: 3/5 configuration
• Package / Case: 20-TSSOP form factor
• Voltage - Supply: 4.5V ~ 5.5V operating range
• Receiver Hysteresis: 500 mV
• Mounting Type: Surface Mount

The ST75185CTR from STMicroelectronics meets all substitution criteria. Both parts share identical electrical specifications for supply voltage, receiver hysteresis, and operating temperature range. Both are packaged in 20-TSSOP and support the same RS232 protocol with 3/5 driver/receiver configuration. The primary distinction is product status: the SN75185PWG4 is obsolete while the ST75185CTR is active, making it the appropriate replacement for new designs and ongoing procurement.

Parameter Comparison

Engineering Selection Recommendations

The ST75185CTR is the direct substitute for the SN75185PWG4. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The ST75185CTR holds active product status, ensuring long-term availability and supply chain continuity. The electrical and mechanical specifications are equivalent across all critical parameters: supply voltage range, receiver hysteresis, operating temperature, package form factor, and RS232 protocol implementation with 3/5 driver/receiver configuration.

The MSL rating difference (1 versus 3) reflects different moisture sensitivity classifications but does not affect functional equivalence. Standard PCB assembly and storage practices accommodate both ratings.

Frequently Asked Questions (FAQ)

Q: Can the ST75185CTR directly replace the SN75185PWG4 in existing designs?

A: Yes. Both parts share identical electrical specifications for supply voltage (4.5V ~ 5.5V), receiver hysteresis (500 mV), operating temperature range (0°C ~ 70°C), and RS232 protocol implementation with 3/5 driver/receiver configuration. The 20-TSSOP package is identical, enabling direct PCB substitution without layout modifications.

Q: What is the significance of the product status difference?

A: The SN75185PWG4 is classified as obsolete, indicating Texas Instruments has discontinued production and support. The ST75185CTR is active, meaning STMicroelectronics continues manufacturing and providing technical support. For new designs and long-term procurement, the active part is the appropriate choice.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. Regulatory compliance is equivalent. The MSL rating difference (1 versus 3) reflects moisture sensitivity classification but does not affect functional performance or compliance status.

Q: Does the full-duplex specification on the ST75185CTR affect compatibility?

A: No. Full-duplex operation is a functional capability of the ST75185CTR that does not restrict its use in applications designed for the SN75185PWG4. The part remains fully compatible with existing circuit designs.

Q: Are there packaging or supply chain considerations?

A: The ST75185CTR is available in Cut Tape (CT) and Digi-Reel packaging options with 19,800 units in stock, providing reliable supply availability. Standard surface mount assembly processes apply to both parts.