SN75C3232DBR Equivalent & Substitute Parts

Part Overview

The SN75C3232DBR is a 2/2 transceiver full RS232 interface IC manufactured by Texas Instruments in a 16-SSOP package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The SN75C3232DBR operates across a 3V to 5.5V supply voltage range with a 1Mbps data rate and 300mV receiver hysteresis, making it suitable for legacy RS232 communication applications requiring full-duplex operation.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75C3232DBR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	1Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	16-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN75C3232DBR is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232 (mandatory)
Number of Drivers/Receivers: 2/2 (mandatory)
Duplex: Full (mandatory)
Voltage - Supply: 3V ~ 5.5V (mandatory)
Mounting Type: Surface Mount (mandatory)

Secondary Compatibility Factors:

Package / Case: 16-SSOP preferred for direct pin compatibility; 16-SOIC and 16-TSSOP acceptable with PCB layout adjustment
Receiver Hysteresis: 300mV or 500mV acceptable within RS232 specification tolerances
Data Rate: 250kbps or higher acceptable for legacy RS232 applications
Operating Temperature: Extended range (-40°C ~ 85°C) provides broader operational envelope than original (0°C ~ 70°C)

Substitute parts are grouped into two categories:

Category 1 - Manufacturer Recommended (Active Status): TRSF3232EIDR (Texas Instruments, 16-SOIC package, -40°C ~ 85°C operating range) and ICL3232CVZ-T / ICL3232EIAZ-T (Renesas Electronics Corporation, 16-TSSOP and 16-SSOP packages respectively, active product status).

Category 2 - Parametric Equivalents (Obsolete Status): SN75C3232EDBR and TRSF3232ECDBR maintain identical electrical specifications and 16-SSOP packaging but are also obsolete.

Parameter Comparison

Parameter	SN75C3232DBR	TRSF3232EIDR	SN75C3232EDBR	TRSF3232ECDBR	ICL3232CVZ-T	ICL3232ECAZ-T	ICL3232EIAZ-T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Renesas	Renesas	Renesas
Protocol	RS232	RS232	RS232	RS232	RS232	RS232	RS232
Drivers/Receivers	2/2	2/2	2/2	2/2	2/2	2/2	2/2
Duplex	Full	Full	Full	Full	Full	Full	Full
Receiver Hysteresis	300 mV	300 mV	300 mV	300 mV	300 mV	500 mV	500 mV
Data Rate	1Mbps	1Mbps	1Mbps	1Mbps	250kbps	250kbps	250kbps
Voltage - Supply	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	16-SSOP	16-SOIC	16-SSOP	16-SSOP	16-TSSOP	16-SSOP	16-SSOP
Product Status	Obsolete	Active	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Active Product Status Requirement:

TRSF3232EIDR is the manufacturer-recommended substitute from Texas Instruments with active product status. This part maintains identical electrical specifications (2/2 transceiver, full RS232, 300mV hysteresis, 1Mbps data rate, 3V-5.5V supply) and extends the operating temperature range to -40°C ~ 85°C. The package change from 16-SSOP to 16-SOIC requires PCB layout modification but provides superior long-term availability and supply chain stability.

ICL3232EIAZ-T (Renesas Electronics Corporation) offers an alternative with active product status, maintaining the original 16-SSOP package footprint. This part features extended operating temperature range (-40°C ~ 85°C), higher receiver hysteresis (500mV), and reduced data rate (250kbps). The 16-SSOP package enables direct PCB compatibility without layout changes. Moisture sensitivity level MSL-3 requires controlled storage conditions (168 hours at 60% RH, 30°C maximum).

For Parametric Equivalence with Original Specifications:

SN75C3232EDBR and TRSF3232ECDBR maintain identical electrical and package specifications to the SN75C3232DBR but retain obsolete product status. These parts are suitable only for replacement in existing inventory or legacy system maintenance where new product qualification is not required.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part. Selection between active and obsolete alternatives depends on procurement timeline, supply chain requirements, and design qualification constraints.

Frequently Asked Questions (FAQ)

Q: Can TRSF3232EIDR replace SN75C3232DBR directly on the PCB?

A: TRSF3232EIDR uses a 16-SOIC package versus the original 16-SSOP package. While pin count and electrical function are identical, the physical footprint differs. PCB layout modification is required. Pin-to-pin functionality is preserved.

Q: What is the difference between ICL3232CVZ-T and ICL3232EIAZ-T?

A: Both are Renesas RS232 transceivers in 16-SSOP packages with identical supply voltage and protocol specifications. ICL3232CVZ-T operates 0°C ~ 70°C with 300mV hysteresis and 250kbps data rate. ICL3232EIAZ-T operates -40°C ~ 85°C with 500mV hysteresis and 250kbps data rate. Selection depends on temperature range requirements and noise immunity needs.

Q: Why do Renesas parts have lower data rates (250kbps vs 1Mbps)?

A: The 250kbps specification reflects Renesas device characterization. Both 250kbps and 1Mbps ratings are within RS232 protocol capability. Legacy RS232 applications typically operate at 9600 to 115200 baud, making both ratings suitable for standard serial communication.

Q: What does MSL-3 (168 Hours) mean for ICL3232 parts?

A: Moisture Sensitivity Level 3 requires storage at ≤60% relative humidity and ≤30°C. The component can be exposed to ambient conditions for maximum 168 hours before soldering. Exceeding this exposure requires baking at 125°C for 24 hours. Original SN75C3232DBR with MSL-1 has unlimited shelf life under standard conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SN75C3232DBR.

Q: Which substitute offers the best long-term availability?

A: TRSF3232EIDR and ICL3232EIAZ-T both carry active product status from their respective manufacturers (Texas Instruments and Renesas Electronics Corporation), providing superior long-term availability compared to obsolete alternatives.

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