SN65C3232D RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN65C3232D is a 2/2 full-duplex RS232 transceiver manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SN65C3232D operates across a 3V to 5.5V supply range with a 1 Mbps data rate and is suitable for legacy serial communication applications requiring full RS232 protocol compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65C3232D
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	1 Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SN65C3232D is determined by the following critical parameters:

Primary Matching Criteria:

RS232 protocol compliance
2/2 driver/receiver configuration
Full-duplex operation
16-SOIC package format (0.154", 3.90mm Width)
3V to 5.5V supply voltage range
Surface mount technology

Secondary Compatibility Factors:

Operating temperature range (-40°C to 85°C preferred for extended industrial applications)
Receiver hysteresis specification (300 mV or 500 mV acceptable)
Data rate capability (minimum 250 kbps; original part rated 1 Mbps)
RoHS3 compliance and MSL rating

Substitute parts are grouped into two categories: parametric equivalents from Texas Instruments and manufacturer-recommended alternatives from Renesas Electronics Corporation. All listed substitutes maintain identical package geometry and pinout compatibility, enabling direct board-level replacement without layout modifications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temperature	Package	Product Status	Packaging Type
SN65C3232D	Texas Instruments	RS232	2/2	300 mV	1 Mbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Obsolete	Tube
SN65C3232ED	Texas Instruments	RS232	2/2	300 mV	1 Mbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Obsolete	Tube
ICL3232CBNZ	Renesas Electronics	RS232	2/2	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SOIC	Active	Tube
ICL3232CBNZ-T	Renesas Electronics	RS232	2/2	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SOIC	Active	Cut Tape (CT) & Digi-Reel
ICL3232ECBNZ	Renesas Electronics	RS232	2/2	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SOIC	Active	Tube
ICL3232ECBNZ-T	Renesas Electronics	RS232	2/2	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SOIC	Active	Cut Tape (CT) & Digi-Reel
ICL3232EIBNZ	Renesas Electronics	RS232	2/2	500 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	Tube
ICL3232EIBNZ-T	Renesas Electronics	RS232	2/2	500 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	Cut Tape (CT) & Digi-Reel
ICL3232IBNZ	Renesas Electronics	RS232	2/2	300 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	Tube
ICL3232IBNZ-T	Renesas Electronics	RS232	2/2	300 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	Cut Tape (CT) & Digi-Reel
ICL3232IBNZ-T7A	Renesas Electronics	RS232	2/2	300 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Texas Instruments Parametric Equivalent: The SN65C3232ED provides direct functional equivalence to the SN65C3232D with identical electrical specifications and operating parameters. Both parts are obsolete; however, the SN65C3232ED maintains higher inventory availability (2140 units) compared to the original part (805 units). Selection of this part is appropriate when maintaining strict Texas Instruments component lineage is required.

Renesas Electronics ICL3232 Series - Active Production: The ICL3232 family represents the primary substitute path, with all variants currently in active production status. This ensures long-term supply chain stability and component availability for new designs and production runs.

Temperature Range Considerations: For applications requiring the full -40°C to 85°C operating range, select ICL3232EIBNZ, ICL3232EIBNZ-T, ICL3232IBNZ, ICL3232IBNZ-T, or ICL3232IBNZ-T7A. These parts maintain the extended temperature specification of the original SN65C3232D.

For applications limited to 0°C to 70°C operation, ICL3232CBNZ and ICL3232CBNZ-T are suitable alternatives with lower cost positioning.

Receiver Hysteresis Selection: ICL3232IBNZ variants (300 mV hysteresis) provide the closest electrical match to the SN65C3232D. ICL3232EIBNZ variants (500 mV hysteresis) offer enhanced noise immunity in electrically noisy environments but require system-level validation for signal integrity.

Packaging and Supply Format: Tube packaging (standard suffix) is suitable for low-volume prototyping and repair applications. Cut Tape (CT) & Digi-Reel and Tape & Reel (TR) formats are optimized for automated assembly and high-volume production.

RoHS and Compliance: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original component.

Frequently Asked Questions (FAQ)

Q: Can ICL3232 parts with 250 kbps data rate replace the SN65C3232D rated at 1 Mbps? A: Yes. The 250 kbps specification represents the guaranteed minimum data rate for the ICL3232 series. These parts are capable of operating at higher data rates in practical applications. The 1 Mbps rating of the SN65C3232D and the 250 kbps rating of the ICL3232 reflect different test and specification methodologies rather than fundamental performance limitations. Direct substitution is valid for RS232 serial communication applications.

Q: What is the difference between ICL3232IBNZ and ICL3232EIBNZ? A: The primary difference is receiver hysteresis: ICL3232IBNZ features 300 mV hysteresis (matching the SN65C3232D), while ICL3232EIBNZ features 500 mV hysteresis. Higher hysteresis reduces susceptibility to noise but may increase propagation delay. Both maintain identical supply voltage, package, and pinout specifications. Selection depends on signal integrity requirements in the target application environment.

Q: Are the -T and -T7A packaging suffixes interchangeable? A: Both suffixes indicate tape and reel packaging suitable for automated assembly. The -T7A variant represents a specific reel configuration. Functionally and electrically, ICL3232IBNZ-T and ICL3232IBNZ-T7A are identical. Selection is determined by assembly equipment compatibility and supplier availability.

Q: Can I use ICL3232CBNZ in an application requiring -40°C to 85°C operation? A: No. The ICL3232CBNZ is rated for 0°C to 70°C operation only. For extended temperature range applications, use ICL3232EIBNZ, ICL3232EIBNZ-T, ICL3232IBNZ, ICL3232IBNZ-T, or ICL3232IBNZ-T7A, all of which support -40°C to 85°C operation.

Q: Is the 16-SOIC package pinout identical across all substitute parts? A: Yes. All listed substitute parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pinout and footprint. Direct board-level replacement is possible without PCB layout modifications.

Q: What is the MSL (Moisture Sensitivity Level) difference between the original and substitute parts? A: The SN65C3232D carries MSL 1 (Unlimited), while all ICL3232 variants carry MSL 3 (168 Hours). MSL 3 requires controlled storage conditions and bake-out procedures before reflow soldering. Ensure manufacturing processes accommodate the higher moisture sensitivity of the substitute parts.

Q: Are all substitute parts RoHS compliant? A: Yes. The SN65C3232D and all listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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