TRS3243ECPW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3243ECPW is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-TSSOP surface mount package. This device operates across 3V to 5.5V supply voltage with a 500kbps data rate and 500mV receiver hysteresis. The part is currently in Last Time Buy status, making equivalent and substitute parts essential for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS3243ECPW
Manufacturer	Texas Instruments
Protocol	RS232
Type	Transceiver
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	500kbps
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	500mV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the TRS3243ECPW is determined by the following critical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

Data Rate: 500kbps (minimum acceptable)
Receiver Hysteresis: 500mV (nominal)
Operating Temperature: 0°C ~ 70°C (minimum acceptable)

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

Parametric Equivalents maintain identical electrical specifications and package footprint, differing only in manufacturer or product status.

Direct Equivalents share all critical parameters but may have minor variations in data rate or temperature range that remain within acceptable operating margins for most applications.

Upgrade Options provide enhanced specifications such as extended temperature range (-40°C ~ 85°C) or improved receiver hysteresis characteristics while maintaining full pin and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Voltage Supply	Operating Temp	Package	Receiver Hysteresis	Product Status	Packaging Type
TRS3243ECPW	Texas Instruments	RS232	3/5	500kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	500mV	Last Time Buy	Tube
MAX3243ECPW	Texas Instruments	RS232	3/5	500kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	500mV	Obsolete	Tube
ICL3243ECVZ	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	500mV	Active	Tube
ICL3243ECVZ-T	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	500mV	Active	Cut Tape & Digi-Reel
ICL3243EIVZ	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500mV	Active	Tube
ICL3243EIVZ-T	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500mV	Active	Cut Tape & Digi-Reel
SP3243EEY-L	MaxLinear, Inc.	RS232	3/5	120Kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	300mV	Active	Tube
SP3243EEY-L/TR	MaxLinear, Inc.	RS232	3/5	120Kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	300mV	Active	Tape & Reel
ICL3243ECAZ	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	500mV	Active	Tube
ICL3243ECAZ-T	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	500mV	Active	Tape & Reel
ICL3243EIAZ	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	500mV	Active	Tube

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (28-TSSOP Package):

The MAX3243ECPW provides parametric equivalence to the TRS3243ECPW with identical electrical specifications and package footprint. However, its Obsolete product status limits long-term availability. The Renesas ICL3243ECVZ and ICL3243ECVZ-T maintain full compatibility with the 28-TSSOP package and Active product status, though data rate is reduced to 250kbps. This reduction remains within acceptable margins for most RS232 applications operating below 500kbps.

For Extended Temperature Range Applications:

The ICL3243EIVZ and ICL3243EIVZ-T offer identical 28-TSSOP package compatibility with extended operating temperature range (-40°C ~ 85°C), suitable for industrial and automotive environments. These parts maintain Active product status with robust long-term availability.

For Alternative Package Consideration (28-SSOP):

The ICL3243ECAZ, ICL3243ECAZ-T, and ICL3243EIAZ provide equivalent electrical functionality in a 28-SSOP package (0.209", 5.30mm Width). This package change requires PCB layout modification but offers Active product status and improved availability. The ICL3243EIAZ variant includes extended temperature range.

For Low Data Rate Applications:

The SP3243EEY-L and SP3243EEY-L/TR from MaxLinear provide 28-TSSOP package compatibility with extended temperature range and RoHS compliance. The 120Kbps data rate and 300mV receiver hysteresis are suitable for applications not requiring the full 500kbps specification.

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use ICL3243ECVZ as a direct replacement for TRS3243ECPW?

A: Yes, the ICL3243ECVZ is pin-compatible and maintains the same 28-TSSOP package footprint. The primary difference is data rate: ICL3243ECVZ operates at 250kbps versus 500kbps for TRS3243ECPW. For applications operating below 250kbps, this substitution is fully compatible. The part is manufactured by Renesas Electronics with Active product status, ensuring long-term availability.

Q: What is the difference between ICL3243ECVZ and ICL3243EIVZ?

A: Both parts share identical package, protocol, and driver/receiver configuration. The key difference is operating temperature range: ICL3243ECVZ operates 0°C ~ 70°C, while ICL3243EIVZ extends to -40°C ~ 85°C. Select ICL3243EIVZ for industrial, automotive, or temperature-extreme environments.

Q: Why do some substitutes have different data rates?

A: Data rate specifications reflect the maximum guaranteed performance of each device. The TRS3243ECPW operates at 500kbps, while Renesas ICL3243 variants operate at 250kbps. Both rates are valid RS232 specifications. Applications requiring data rates below 250kbps can use either part without functional impact. Applications requiring 500kbps should use MAX3243ECPW or remain with TRS3243ECPW.

Q: Can I substitute a 28-SSOP package part for the 28-TSSOP original?

A: No, without PCB redesign. The 28-SSOP package (0.209", 5.30mm Width) has different pin spacing than 28-TSSOP (0.173", 4.40mm Width). Parts like ICL3243ECAZ require new PCB layout. Use 28-TSSOP substitutes (ICL3243ECVZ, ICL3243EIVZ, SP3243EEY-L) for direct board-level replacement.

Q: What does "Last Time Buy" status mean for TRS3243ECPW?

A: Last Time Buy indicates Texas Instruments will no longer manufacture this part after a specified date. Existing inventory may be available, but long-term supply is not guaranteed. Transition to Active status alternatives such as ICL3243ECVZ or ICL3243EIVZ for new designs and ongoing production.

Q: Are all substitute parts RoHS compliant?

A: Yes. TRS3243ECPW is ROHS3 Compliant. All listed substitutes maintain RoHS or ROHS3 compliance, ensuring environmental and regulatory compatibility.

Q: Which substitute offers the best long-term availability?

A: Renesas ICL3243 variants (ECVZ, EIVZ, ECAZ, EIAZ) and MaxLinear SP3243 variants all carry Active product status with robust manufacturing support. ICL3243ECVZ-T and ICL3243ECAZ-T offer Tape & Reel packaging with highest inventory levels (7514 and 20100 units respectively), indicating strong market availability.

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