TRS3243CDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3243CDB is a 3/5 transceiver full RS232 interface IC manufactured by Texas Instruments in a 28-SSOP surface mount package. This part is discontinued at DiGi Electronics but remains available in inventory (864 pcs new original in stock). The TRS3243CDB operates across a 3V to 5.5V supply range with a 250kbps data rate and 500mV receiver hysteresis, designed for industrial and commercial RS232 communication applications. Due to its discontinued status, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	TRS3243CDB Specification
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	250kbps
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	500mV
Package / Case	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TRS3243CDB is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Package / Case: 28-SSOP (0.209", 5.30mm Width)
Mounting Type: Surface Mount
Voltage Supply Range: 3V ~ 5.5V
Receiver Hysteresis: 500mV

Compatible Variation Parameters:

Data Rate: 250kbps or higher (250kbps minimum required)
Operating Temperature: 0°C ~ 70°C or extended range (-40°C ~ 85°C acceptable)
RoHS Status: ROHS3 Compliant or RoHS Compliant
Moisture Sensitivity Level: 1 or 2

All substitute parts listed maintain identical electrical and mechanical specifications within these allowable parameters, ensuring direct functional compatibility with the TRS3243CDB in existing circuit designs.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Operating Temp	Receiver Hysteresis	Product Status	Inventory (pcs)	Packaging
TRS3243CDB	Texas Instruments	250kbps	0°C ~ 70°C	500mV	Discontinued	864	-
ICL3245CAZ-T	Renesas Electronics	1Mbps	0°C ~ 70°C	500mV	Active	1840	Tape & Reel
ICL3245ECAZ-T	Renesas Electronics	1Mbps	0°C ~ 70°C	500mV	Active	2016	Tape & Reel
MAX3243ECAI+T	Analog Devices Inc./Maxim Integrated	250kbps	0°C ~ 70°C	500mV	Active	1700	Cut Tape & Digi-Reel
MAX3244ECAI+T	Analog Devices Inc./Maxim Integrated	250kbps	0°C ~ 70°C	500mV	Active	3580	Tape & Reel
MAX3245ECAI+	Analog Devices Inc./Maxim Integrated	1Mbps	0°C ~ 70°C	500mV	Active	2310	Tube
MAX3243EEAI+	Analog Devices Inc./Maxim Integrated	250kbps	-40°C ~ 85°C	500mV	Active	2140	Tube
MAX3243EEAI+T	Analog Devices Inc./Maxim Integrated	250kbps	-40°C ~ 85°C	500mV	Active	15588	Cut Tape & Digi-Reel
MAX3244EEAI+	Analog Devices Inc./Maxim Integrated	250kbps	-40°C ~ 85°C	500mV	Active	2200	Tube
SP3243EBEA-L/TR	MaxLinear, Inc.	250kbps	-40°C ~ 85°C	300mV	Active	19750	Tape & Reel
SP3243EEA-L/TR	MaxLinear, Inc.	120Kbps	-40°C ~ 85°C	300mV	Active	27600	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Equivalents (Identical Operating Temperature Range): MAX3243ECAI+T and MAX3244ECAI+T maintain the original 0°C ~ 70°C operating temperature specification with active product status and high inventory availability. These parts are suitable for direct replacement in applications with standard industrial temperature requirements.

Extended Temperature Range Alternatives: MAX3243EEAI+T, MAX3243EEAI+, MAX3244EEAI+, SP3243EBEA-L/TR, and SP3243EEA-L/TR offer extended operating temperature ranges (-40°C ~ 85°C), providing enhanced reliability for applications requiring broader thermal performance. MAX3243EEAI+T offers the highest inventory level (15,588 pcs) among extended-range options.

High Data Rate Options: ICL3245CAZ-T, ICL3245ECAZ-T, and MAX3245ECAI+ support 1Mbps data rates, exceeding the original 250kbps specification while maintaining all other electrical parameters. These parts are suitable for applications requiring higher communication speeds within the same package footprint.

Receiver Hysteresis Consideration: SP3243EBEA-L/TR and SP3243EEA-L/TR feature 300mV receiver hysteresis compared to the original 500mV specification. This reduced hysteresis may provide improved noise immunity in certain applications but represents a parameter deviation from the original design.

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

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher data rate than the original TRS3243CDB? A: Yes. Parts with data rates of 1Mbps (ICL3245CAZ-T, ICL3245ECAZ-T, MAX3245ECAI+) are fully compatible. Higher data rate capability does not affect operation at lower speeds and provides additional performance headroom for future design iterations.

Q: What is the difference between the MAX3243ECAI+T and MAX3243EEAI+T variants? A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is operating temperature range: MAX3243ECAI+T operates 0°C ~ 70°C, while MAX3243EEAI+T operates -40°C ~ 85°C. Select based on your application's thermal requirements.

Q: Are the SP3243 series parts fully compatible with the TRS3243CDB? A: SP3243EBEA-L/TR and SP3243EEA-L/TR are mechanically and electrically compatible with one exception: receiver hysteresis is 300mV instead of 500mV. This reduced hysteresis may improve noise immunity but represents a specification change. Evaluate for your specific application requirements.

Q: Does packaging type affect electrical performance? A: No. Tape & Reel, Cut Tape & Digi-Reel, and Tube packaging options contain identical die and electrical specifications. Packaging selection is determined by your assembly process and volume requirements, not electrical compatibility.

Q: Which substitute part offers the best inventory availability? A: SP3243EEA-L/TR provides the highest inventory level at 27,600 pcs, followed by MAX3243EEAI+T at 15,588 pcs. Both are active products with extended temperature range specifications.

Q: Can I substitute a part with extended temperature range (-40°C ~ 85°C) in an application designed for 0°C ~ 70°C? A: Yes. Extended temperature range parts are fully backward compatible with standard temperature applications. They provide additional thermal margin and are suitable for any application within the original temperature specification.

Q: What is the minimum data rate requirement for substitution? A: The minimum acceptable data rate is 250kbps, matching the original TRS3243CDB specification. Parts with 120Kbps (SP3243EEA-L/TR) fall below this threshold and are not recommended as direct substitutes for standard applications.

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