SN75185DB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN75185DB is a 3/5 RS232 transceiver IC manufactured by Texas Instruments in a 20-SSOP surface mount package. This interface component is designed for serial communication applications requiring RS232 protocol support with 3 drivers and 5 receivers. The SN75185DB is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure continued availability for new designs, production continuity, and long-term system support.

Key Parameters

Parameter	Value
Protocol	RS232
Number of Drivers/Receivers	3/5
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature Range	0°C ~ 70°C
Receiver Hysteresis	500 mV
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN75185DB is determined by the following critical parameters:

Protocol compatibility: RS232
Driver/Receiver configuration: 3/5
Supply voltage range: 4.5V ~ 5.5V
Operating temperature range: 0°C ~ 70°C
Receiver hysteresis: 500 mV
Surface mount technology
RoHS3 compliance

Two substitute parts meet these core electrical and mechanical requirements: the SN75185DBR (Texas Instruments, Tape & Reel packaging) and the ST75185CTR (STMicroelectronics, Cut Tape & Digi-Reel packaging). Both maintain identical functional specifications and compliance certifications, with differences limited to packaging format and minor package geometry variations.

Parameter Comparison

Parameter	SN75185DB	SN75185DBR	ST75185CTR
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics
Protocol	RS232	RS232	RS232
Drivers/Receivers	3/5	3/5	3/5
Duplex	-	-	Full
Receiver Hysteresis	500 mV	500 mV	500 mV
Data Rate	-	-	120 Kbps
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)
Packaging Format	Tube	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The SN75185DBR is the primary substitute for the SN75185DB. Both parts are manufactured by Texas Instruments with identical electrical specifications and package dimensions. The SN75185DBR differs only in packaging format (Tape & Reel versus Tube) and maintains Active product status, ensuring long-term availability and supply chain continuity. This part is recommended for direct replacement in new production runs and design revisions.

The ST75185CTR from STMicroelectronics is a secondary substitute option. It maintains all critical electrical parameters and compliance certifications. However, the ST75185CTR uses a 20-TSSOP package (0.173" width) compared to the 20-SSOP package (0.209" width) of the SN75185DB, requiring PCB layout verification for pin-to-pin compatibility. Additionally, the ST75185CTR has a Moisture Sensitivity Level of 3 (168 Hours) versus Level 1 (Unlimited) for the SN75185DB, necessitating stricter handling and storage protocols during manufacturing. The ST75185CTR is suitable for applications where package footprint differences are acceptable and moisture control procedures are implemented.

Frequently Asked Questions (FAQ)

Q: Can the SN75185DBR be used as a direct replacement for the SN75185DB?

A: Yes. The SN75185DBR is electrically and functionally identical to the SN75185DB. Both use the same 20-SSOP package with identical pin assignments and electrical specifications. The only difference is packaging format (Tape & Reel versus Tube). PCB layout and schematic integration require no modifications.

Q: What are the package differences between the SN75185DB and ST75185CTR?

A: The SN75185DB uses a 20-SSOP package with 0.209" width, while the ST75185CTR uses a 20-TSSOP package with 0.173" width. Although both are 20-pin surface mount packages with identical pin counts and assignments, the reduced width of the TSSOP package may affect PCB footprint compatibility. Verify PCB layout dimensions and trace routing before implementation.

Q: Does the ST75185CTR require different handling procedures?

A: Yes. The ST75185CTR has a Moisture Sensitivity Level of 3 (168 Hours), compared to Level 1 (Unlimited) for the SN75185DB. This requires adherence to moisture control procedures during storage, handling, and assembly. Parts must be stored in dry conditions and baked according to IPC-A-610 standards prior to reflow soldering if moisture absorption limits are exceeded.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The SN75185DBR and ST75185CTR are both ROHS3 compliant and REACH unaffected, matching the compliance status of the SN75185DB. All three parts are suitable for applications requiring environmental and regulatory compliance.

Q: What is the significance of the SN75185DB being in Last Time Buy status?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of the SN75185DB and will no longer accept new orders after a specified cutoff date. Existing inventory will be depleted. The SN75185DBR and ST75185CTR are both in Active status, ensuring continued availability for future production requirements.

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