SN65C3243DW Equivalent & Substitute Parts

Part Overview

The SN65C3243DW is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-SOIC package. This device operates across a 3V to 5.5V supply range with a 1Mbps data rate and is compliant with ROHS3 standards. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65C3243DW
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	1Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	28-SOIC (0.295", 7.50mm Width)
Receiver Hysteresis	500 mV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN65C3243DW is determined by the following critical parameters:

Protocol: RS232 full-duplex transceiver
Driver/Receiver Configuration: 3 drivers and 5 receivers
Package Type: 28-SOIC form factor (0.295", 7.50mm Width)
Data Rate: Minimum 1Mbps capability
Supply Voltage Range: 3V to 5.5V compatibility
Operating Temperature: Support for -40°C to 85°C range
RoHS3 Compliance: Environmental regulatory requirement

Substitute parts are grouped into three categories based on their relationship to the main part:

MFR Recommended Substitutes: Parts recommended by manufacturers as direct functional replacements with identical or superior electrical characteristics.

Direct Substitutes: Parts with equivalent electrical specifications and identical package types, differing primarily in manufacturer or data rate capability.

Upgrade Options: Parts offering enhanced performance (higher data rates) or alternative temperature ratings while maintaining package compatibility and core functionality.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Package	Receiver Hysteresis	Product Status
SN65C3243DW	Texas Instruments	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Last Time Buy
TRSF3243EIPWR	Texas Instruments	3/5	1Mbps	3V ~ 3.6V, 4.5V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500 mV	Active
MAX3243EEWI+	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active
MAX3243EEWI+T	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active
MAX3244EEWI+	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active
MAX3244EEWI+T	Analog Devices Inc./Maxim Integrated	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active
MAX3245EEWI+T	Analog Devices Inc./Maxim Integrated	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	500 mV	Active
MAX3245ECWI+	Analog Devices Inc./Maxim Integrated	3/5	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	500 mV	Active
MAX3245ECWI+T	Analog Devices Inc./Maxim Integrated	3/5	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	500 mV	Active
ICL3243CBZ	Renesas Electronics Corporation	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	300 mV	Active
ICL3243CBZ-T	Renesas Electronics Corporation	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	300 mV	Active

Engineering Selection Recommendations

For Direct Replacement with Extended Temperature Support: The MAX3245EEWI+T and MAX3245ECWI+T offer full compatibility with the SN65C3243DW in 28-SOIC packaging while maintaining 1Mbps data rate capability. Both parts are ROHS3 compliant and actively produced. The MAX3245EEWI+T supports the full -40°C to 85°C temperature range, matching the original specification. The MAX3245ECWI+T variant operates within 0°C to 70°C, suitable for commercial-grade applications.

For Package Form Factor Alternatives: The TRSF3243EIPWR from Texas Instruments provides an active alternative in 28-TSSOP packaging with identical electrical specifications and 1Mbps data rate. This option is beneficial for space-constrained designs requiring a smaller footprint while maintaining full functional compatibility.

For Lower Data Rate Applications: The MAX3243EEWI+, MAX3243EEWI+T, MAX3244EEWI+, and MAX3244EEWI+T support 250kbps data rates in 28-SOIC packaging. These parts are suitable for applications where the full 1Mbps capability is not required. All maintain 3V to 5.5V supply compatibility and -40°C to 85°C operating range.

For Commercial Temperature Range Applications: The ICL3243CBZ and ICL3243CBZ-T from Renesas Electronics Corporation operate within 0°C to 70°C and feature 250kbps data rate capability. These parts are ROHS3 compliant with MSL-3 moisture sensitivity rating and are suitable for non-industrial environments.

All substitute parts listed maintain ROHS3 compliance and are currently in active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the MAX3243EEWI+ series be used as a direct replacement for the SN65C3243DW?

A: The MAX3243EEWI+ and MAX3243EEWI+T are functionally compatible in terms of package type (28-SOIC), driver/receiver configuration (3/5), supply voltage (3V to 5.5V), and operating temperature (-40°C to 85°C). However, the data rate is limited to 250kbps compared to the SN65C3243DW's 1Mbps capability. This substitution is valid for applications not requiring the full 1Mbps bandwidth.

Q: What is the difference between the MAX3245EEWI+T and MAX3245ECWI+T?

A: Both parts share identical electrical specifications, 1Mbps data rate, and 28-SOIC packaging. The primary difference is operating temperature range: MAX3245EEWI+T supports -40°C to 85°C (industrial grade), while MAX3245ECWI+T operates within 0°C to 70°C (commercial grade). Select based on your application's temperature requirements.

Q: Why is the TRSF3243EIPWR packaged differently?

A: The TRSF3243EIPWR uses 28-TSSOP packaging instead of 28-SOIC. While electrically equivalent with 1Mbps data rate and full temperature range support, the TSSOP package is physically smaller (4.40mm width versus 7.50mm). This option is suitable for designs where PCB space is limited, but requires layout redesign due to different pin spacing.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The ICL3243CBZ and ICL3243CBZ-T variants have MSL-3 moisture sensitivity rating (168 hours) compared to MSL-1 (unlimited) for other options. This affects storage and handling requirements but does not impact functional compatibility.

Q: Which substitute offers the best compatibility for a direct PCB swap?

A: The MAX3245EEWI+T provides the closest compatibility: identical 28-SOIC package, 1Mbps data rate matching the original, full -40°C to 85°C temperature range, and ROHS3 compliance. No layout changes are required for this substitution.

Q: Can I use a 250kbps part in a design originally specified for 1Mbps?

A: Only if your application's actual data rate requirement is 250kbps or lower. The MAX3243 and MAX3244 series are rated for 250kbps maximum. Using these parts in a 1Mbps application will result in communication failures. Verify your system's actual bandwidth requirement before selecting a lower-rated substitute.

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