SN75185DBR Equivalent & Substitute Parts

Part Overview

The SN75185DBR is an active RS232 interface transceiver manufactured by Texas Instruments, configured as a 3/5 driver/receiver in a 20-SSOP surface mount package. This component is designed for serial communication applications requiring RS232 protocol compliance. The part maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating, making it suitable for standard industrial and commercial applications. Equivalent parts are identified based on matching electrical specifications, protocol compatibility, and mechanical form factors that permit direct functional substitution in circuit designs.

Substiute Parts

SN75185DBR

Texas InstrumentsIn Stock: 2914SN75185DBR Datasheet

Current PartRFQ

ST75185CTR

STMicroelectronicsIn Stock: 19823ST75185CTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75185DBR is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Protocol: RS232
• Driver/Receiver Configuration: 3/5
• Receiver Hysteresis: 500 mV
• Supply Voltage Range: 4.5V ~ 5.5V
• Operating Temperature Range: 0°C ~ 70°C

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount
• Package Family: 20-pin SSOP or equivalent pin-compatible variants

Regulatory & Environmental Requirements:

• RoHS3 Compliance
• REACH Unaffected Status
• ECCN: EAR99

The ST75185CTR from STMicroelectronics qualifies as a functional equivalent based on matching electrical specifications, identical protocol support, and compatible pin configuration. While package geometry differs slightly (20-TSSOP vs. 20-SSOP), both maintain surface mount compatibility with standard PCB layouts designed for 20-pin SSOP footprints.

Parameter Comparison

Engineering Selection Recommendations

Both the SN75185DBR and ST75185CTR maintain active product status with full regulatory compliance under RoHS3 and REACH standards. Selection between these parts should be based on:

Availability and Lead Time: The ST75185CTR currently maintains higher inventory levels (19,800 pcs) compared to the SN75185DBR (2,845 pcs), making it suitable for applications where supply continuity is a priority.

Packaging Considerations: The ST75185CTR uses a narrower 20-TSSOP package (4.40mm width) versus the 20-SSOP package (5.30mm width) of the SN75185DBR. PCB layout compatibility must be verified for the specific footprint used in the target design.

Moisture Sensitivity: The SN75185DBR carries MSL 1 (unlimited), while the ST75185CTR carries MSL 3 (168 hours). Storage and handling procedures may differ accordingly.

Both parts are suitable for direct functional substitution in RS232 serial communication circuits operating within the specified voltage and temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can the ST75185CTR directly replace the SN75185DBR on an existing PCB?

A: Electrical substitution is valid based on matching protocol, driver/receiver configuration, and supply specifications. However, physical PCB compatibility depends on whether the design footprint accommodates the 20-TSSOP package (4.40mm width) versus the original 20-SSOP package (5.30mm width). Pin configuration remains compatible for both packages.

Q: What are the key electrical parameters that define substitution eligibility?

A: The critical parameters are RS232 protocol compliance, 3/5 driver/receiver configuration, 500 mV receiver hysteresis, 4.5V to 5.5V supply voltage range, and 0°C to 70°C operating temperature range. Parts matching all these specifications are functionally equivalent.

Q: Are there differences in data rate specifications between these parts?

A: The SN75185DBR does not specify a data rate parameter in the provided documentation. The ST75185CTR specifies 120 Kbps. Both parts support standard RS232 serial communication within their operating specifications.

Q: How do moisture sensitivity levels affect component handling?

A: The SN75185DBR (MSL 1) has unlimited shelf life under standard conditions. The ST75185CTR (MSL 3) requires controlled storage conditions with a maximum floor life of 168 hours after moisture exposure. Handling procedures should follow the respective manufacturer guidelines.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the SN75185DBR and ST75185CTR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for commercial and industrial applications.