TRSF3243CDWR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3243CDWR is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across a 3V to 5.5V supply range with a 1Mbps data rate and 500mV receiver hysteresis, suitable for legacy serial communication applications requiring full RS232 protocol compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRSF3243CDWR
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	1Mbps
Receiver Hysteresis	500 mV
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TRSF3243CDWR is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232 full-duplex transceiver
Driver/Receiver Configuration: 3 drivers / 5 receivers
Package: 28-SOIC surface mount
Supply Voltage Range: 3V ~ 5.5V
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount
RoHS3 Compliance

Allowable Variations:

Data Rate: Substitute parts may operate at 250kbps or 1Mbps (1Mbps is preferred for full compatibility)
Receiver Hysteresis: 300mV or 500mV (500mV matches the original specification)
Product Status: Active status substitutes are preferred over obsolete parts
Packaging Format: Tube or Tape & Reel formats are interchangeable for the same part number

The substitute parts listed below maintain all critical parameters while offering active product status and improved availability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	RoHS3
TRSF3243CDWR	Texas Instruments	Obsolete	3/5	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Yes
MAX3243ECWI+	Analog Devices Inc./Maxim Integrated	Active	3/5	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Yes
MAX3244ECWI+	Analog Devices Inc./Maxim Integrated	Active	3/5	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Yes
MAX3245ECWI+	Analog Devices Inc./Maxim Integrated	Active	3/5	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Yes
MAX3245CWI+T	Analog Devices Inc./Maxim Integrated	Active	3/5	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Yes
MAX3245ECWI+T	Analog Devices Inc./Maxim Integrated	Active	3/5	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Yes

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): MAX3245ECWI+ and MAX3245ECWI+T are the preferred substitutes for TRSF3243CDWR. These parts maintain identical electrical specifications including 1Mbps data rate and 500mV receiver hysteresis, ensuring direct functional equivalence. Both are manufactured by Analog Devices Inc./Maxim Integrated with active product status, ROHS3 compliance, and unlimited moisture sensitivity rating. The ECWI+ variant is packaged in Tube format, while ECWI+T is supplied in Tape & Reel format.

Secondary Substitutes (Reduced Data Rate): MAX3244ECWI+ maintains the 500mV receiver hysteresis specification but operates at 250kbps data rate. This part is suitable for applications where the full 1Mbps capability is not required. MAX3243ECWI+ operates at 250kbps with 300mV receiver hysteresis and is appropriate only for systems with lower bandwidth requirements and higher noise immunity tolerance.

Compliance Status: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification, matching the regulatory profile of the original TRSF3243CDWR.

Frequently Asked Questions (FAQ)

Q: Can MAX3245ECWI+ directly replace TRSF3243CDWR in existing designs? A: Yes. MAX3245ECWI+ is a direct functional equivalent with identical driver/receiver configuration (3/5), data rate (1Mbps), receiver hysteresis (500mV), supply voltage range (3V ~ 5.5V), operating temperature (0°C ~ 70°C), and 28-SOIC package. Pin-to-pin compatibility and electrical performance are equivalent.

Q: What is the difference between MAX3245ECWI+ and MAX3245ECWI+T? A: Both parts are electrically identical. The primary difference is packaging format: MAX3245ECWI+ is supplied in Tube packaging, while MAX3245ECWI+T is supplied in Tape & Reel format. Selection depends on assembly process requirements and volume considerations.

Q: Why would I choose MAX3244ECWI+ over MAX3245ECWI+? A: MAX3244ECWI+ operates at 250kbps data rate compared to MAX3245ECWI+ at 1Mbps. Selection of MAX3244ECWI+ is appropriate only when system bandwidth requirements do not exceed 250kbps, as it provides no performance advantage over the higher-speed MAX3245 variant.

Q: Is MAX3243ECWI+ suitable as a substitute? A: MAX3243ECWI+ maintains the 3/5 driver/receiver configuration and 28-SOIC package but operates at 250kbps with 300mV receiver hysteresis. This part is suitable only for applications with reduced bandwidth requirements and where the lower hysteresis specification does not compromise noise immunity in the operating environment.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (MAX3243ECWI+, MAX3244ECWI+, MAX3245ECWI+, MAX3245CWI+T, and MAX3245ECWI+T) maintain ROHS3 compliance and REACH unaffected status, matching the regulatory requirements of the original TRSF3243CDWR.

Q: What is the moisture sensitivity level for substitute parts? A: All substitute parts maintain MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

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