TRS3243IPW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3243IPW is a 3/5 full-duplex RS232 transceiver manufactured by Texas Instruments in a 28-TSSOP surface mount package. This part operates across a 3V to 5.5V supply range with a 250kbps data rate and 500mV receiver hysteresis. The TRS3243IPW is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility within the RS232 interface category while meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	TRS3243IPW Specification
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Package / Case	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Receiver Hysteresis	500 mV
Data Rate	250kbps
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TRS3243IPW is determined by strict adherence to the following parameters:

Critical Parameters for Substitution:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Package / Case: 28-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Voltage - Supply: 3V ~ 5.5V
RoHS Status: ROHS3 Compliant

Allowable Variations:

Data Rate: Equal to or greater than 250kbps
Receiver Hysteresis: 300mV or 500mV
Operating Temperature: Must encompass or match -40°C ~ 85°C range
Product Status: Active parts preferred for production continuity
Moisture Sensitivity Level: MSL 1 or MSL 3

Substitute parts are grouped based on these criteria. Parts meeting all critical parameters with equal or superior data rates and compatible temperature ranges are classified as direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Operating Temperature	Product Status	Inventory
TRS3243IPW	Texas Instruments	250kbps	500 mV	-40°C ~ 85°C	Obsolete	719 Pcs
TRS3243EIPWR	Texas Instruments	500kbps	500 mV	-40°C ~ 85°C	Active	76080 Pcs
MAX3245EEUI+	Analog Devices Inc./Maxim Integrated	1Mbps	500 mV	-40°C ~ 85°C	Active	1900 Pcs
ICL3243EIVZ-T	Renesas Electronics Corporation	250kbps	500 mV	-40°C ~ 85°C	Active	1464 Pcs
MAX3243ECUI+	Analog Devices Inc./Maxim Integrated	120Kbps	300 mV	0°C ~ 70°C	Active	2100 Pcs
MAX3243ECUI+T	Analog Devices Inc./Maxim Integrated	120Kbps	300 mV	0°C ~ 70°C	Active	3700 Pcs
MAX3243EEUI+	Analog Devices Inc./Maxim Integrated	120Kbps	300 mV	-40°C ~ 85°C	Active	1900 Pcs
MAX3243EEUI+T	Analog Devices Inc./Maxim Integrated	120Kbps	300 mV	-40°C ~ 85°C	Active	2300 Pcs
MAX3244ECUI+	Analog Devices Inc./Maxim Integrated	250kbps	500 mV	0°C ~ 70°C	Active	924 Pcs
MAX3245ECUI+	Analog Devices Inc./Maxim Integrated	1Mbps	500 mV	0°C ~ 70°C	Active	5200 Pcs
MAX3245EEUI+T	Analog Devices Inc./Maxim Integrated	1Mbps	500 mV	-40°C ~ 85°C	Active	4680 Pcs

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Production):

TRS3243EIPWR (Texas Instruments) and ICL3243EIVZ-T (Renesas Electronics Corporation) are the primary substitutes. Both maintain identical package specifications, supply voltage range, and full operating temperature range (-40°C ~ 85°C). TRS3243EIPWR offers superior data rate performance (500kbps) while maintaining 500mV receiver hysteresis. ICL3243EIVZ-T matches the original 250kbps data rate specification. Both parts are ROHS3 compliant and active in production status.

Tier 2 - Compatible Substitutes (Extended Performance):

MAX3245EEUI+T (Analog Devices Inc./Maxim Integrated) provides enhanced data rate capability (1Mbps) with full temperature range coverage (-40°C ~ 85°C). This part is suitable for applications requiring higher bandwidth while maintaining backward compatibility with the 28-TSSOP package and 3V to 5.5V supply range.

Tier 3 - Limited Substitutes (Temperature-Restricted):

MAX3244ECUI+ and MAX3245ECUI+ are compatible substitutes with restricted operating temperature range (0°C ~ 70°C). These parts are suitable only for applications within this narrower temperature window. MAX3245ECUI+ offers 1Mbps data rate performance.

Not Recommended:

MAX3243ECUI+, MAX3243ECUI+T, MAX3243EEUI+, and MAX3243EEUI+T operate at 120Kbps data rate, which is below the original 250kbps specification. These parts are suitable only for legacy applications with lower bandwidth requirements and are not recommended as primary substitutes for the TRS3243IPW.

Frequently Asked Questions (FAQ)

Q: Can I use MAX3243ECUI+ as a direct replacement for TRS3243IPW?

A: No. While MAX3243ECUI+ maintains the same 28-TSSOP package and 3V to 5.5V supply range, it operates at 120Kbps data rate, which is below the original 250kbps specification. Additionally, its operating temperature range (0°C ~ 70°C) is narrower than the original (-40°C ~ 85°C). This part is suitable only for applications with lower bandwidth and temperature requirements.

Q: What is the difference between TRS3243EIPWR and ICL3243EIVZ-T?

A: Both are direct substitutes with identical package, supply voltage, and full temperature range specifications. TRS3243EIPWR (Texas Instruments) operates at 500kbps, while ICL3243EIVZ-T (Renesas Electronics Corporation) operates at 250kbps, matching the original specification. TRS3243EIPWR is preferred for applications requiring higher data rates. TRS3243EIPWR has significantly higher inventory availability (76080 Pcs vs. 1464 Pcs).

Q: Can I use MAX3245EEUI+T in place of TRS3243IPW?

A: Yes. MAX3245EEUI+T is a compatible substitute that maintains the 28-TSSOP package, 3V to 5.5V supply range, and full operating temperature range (-40°C ~ 85°C). It provides enhanced data rate performance (1Mbps) and 500mV receiver hysteresis. This part is suitable for applications requiring higher bandwidth while maintaining full temperature coverage.

Q: What does receiver hysteresis mean in the context of RS232 transceivers?

A: Receiver hysteresis is the voltage difference between the rising and falling threshold levels of the receiver input. The TRS3243IPW specifies 500mV hysteresis, which provides noise immunity in the RS232 signal path. Substitute parts with 300mV or 500mV hysteresis are compatible, though 500mV provides superior noise rejection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the original TRS3243IPW specification. All parts are also REACH unaffected and classified under ECCN EAR99.

Q: What is the significance of MSL (Moisture Sensitivity Level) in component selection?

A: Moisture Sensitivity Level indicates the component's sensitivity to moisture absorption during storage and handling. The TRS3243IPW specifies MSL 1 (Unlimited), meaning no moisture precautions are required. ICL3243EIVZ-T specifies MSL 3 (168 Hours), requiring moisture control during storage. All other substitutes maintain MSL 1 specification.

Q: Can I mix different substitute parts in the same production run?

A: All listed substitute parts maintain identical package specifications (28-TSSOP) and pinout compatibility. However, differences in data rate and operating temperature range should be evaluated against specific application requirements. For consistency, use a single substitute part number per production batch.

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