TRS3243IPWR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3243IPWR is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-TSSOP surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The TRS3243IPWR operates across a 3V to 5.5V supply range with a 250kbps data rate and -40°C to 85°C operating temperature range, making it suitable for legacy industrial and embedded communication applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS3243IPWR
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	-40°C ~ 85°C
Package / Case	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TRS3243IPWR is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Allowable Variation Parameters:

Data Rate: Substitute parts may operate at equal or higher data rates (250kbps or above)
Receiver Hysteresis: Acceptable range 300mV to 500mV
Operating Temperature: Substitute parts must support the full -40°C to 85°C range or a subset thereof
Product Status: Active status preferred for new designs

Substitute parts are grouped into two categories: direct manufacturer-recommended equivalents from Texas Instruments and parametric equivalents from alternative manufacturers (Analog Devices Inc./Maxim Integrated and Renesas Electronics Corporation) that meet all critical matching parameters.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Operating Temperature	Product Status	Inventory (Pcs)
TRS3243IPWR	Texas Instruments	250kbps	500mV	-40°C ~ 85°C	Obsolete	88400
TRS3243EIPWR	Texas Instruments	500kbps	500mV	-40°C ~ 85°C	Active	76080
MAX3243IPWR	Texas Instruments	250kbps	500mV	-40°C ~ 85°C	Active	21200
ICL3243EIVZ	Renesas Electronics Corporation	250kbps	500mV	-40°C ~ 85°C	Active	9919
MAX3243ECUI+	Analog Devices Inc./Maxim Integrated	120Kbps	300mV	0°C ~ 70°C	Active	2100
MAX3243ECUI+T	Analog Devices Inc./Maxim Integrated	120Kbps	300mV	0°C ~ 70°C	Active	3700
MAX3243EEUI+	Analog Devices Inc./Maxim Integrated	120Kbps	300mV	-40°C ~ 85°C	Active	1900
MAX3243EEUI+T	Analog Devices Inc./Maxim Integrated	120Kbps	300mV	-40°C ~ 85°C	Active	2300
MAX3244ECUI+	Analog Devices Inc./Maxim Integrated	250kbps	500mV	0°C ~ 70°C	Active	924
MAX3244EEUI+	Analog Devices Inc./Maxim Integrated	250kbps	500mV	-40°C ~ 85°C	Active	1589
MAX3245ECUI+	Analog Devices Inc./Maxim Integrated	1Mbps	500mV	0°C ~ 70°C	Active	5200

Engineering Selection Recommendations

Primary Recommendation - Texas Instruments TRS3243EIPWR: The TRS3243EIPWR is the manufacturer-recommended direct upgrade from Texas Instruments. It maintains identical electrical specifications to the TRS3243IPWR with the exception of an enhanced 500kbps data rate (versus 250kbps), operates across the full -40°C to 85°C temperature range, and holds active product status. This part is ROHS3 compliant and offers the highest inventory availability (76080 pcs), making it the optimal choice for design continuity and production volume requirements.

Secondary Recommendation - Texas Instruments MAX3243IPWR: The MAX3243IPWR provides parametric equivalence with identical electrical performance to the original TRS3243IPWR (250kbps data rate, 500mV receiver hysteresis, -40°C to 85°C operating range) and active product status. This part is suitable for applications requiring exact performance matching with the obsolete component.

Alternative Recommendation - Renesas Electronics Corporation ICL3243EIVZ: The ICL3243EIVZ from Renesas Electronics Corporation meets all critical electrical and mechanical parameters with active product status and ROHS3 compliance. Operating temperature range is -40°C to 85°C. This option provides supply diversification from an alternative qualified manufacturer.

Conditional Recommendation - Analog Devices Inc./Maxim Integrated MAX3244EEUI+ or MAX3244ECUI+: The MAX3244 series (MAX3244EEUI+ for extended temperature -40°C to 85°C, or MAX3244ECUI+ for commercial temperature 0°C to 70°C) provides identical data rate (250kbps) and receiver hysteresis (500mV) specifications. These parts are suitable for applications where operating temperature requirements align with the selected variant.

Not Recommended - Analog Devices Inc./Maxim Integrated MAX3243 Series (ECUI+, ECUI+T, EEUI+, EEUI+T): The MAX3243 variants operate at reduced data rates (120Kbps versus 250kbps) and reduced receiver hysteresis (300mV versus 500mV). These parts are suitable only for applications with lower bandwidth requirements and relaxed noise immunity specifications.

Not Recommended - Analog Devices Inc./Maxim Integrated MAX3245ECUI+: The MAX3245ECUI+ operates at an elevated data rate (1Mbps) and restricted commercial temperature range (0°C to 70°C). This part is suitable only for applications requiring higher bandwidth with relaxed temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can the TRS3243EIPWR directly replace the TRS3243IPWR in existing designs?

A: Yes. The TRS3243EIPWR is the manufacturer-recommended direct replacement. It maintains identical package, pinout, voltage supply range (3V to 5.5V), operating temperature range (-40°C to 85°C), and core RS232 transceiver functionality. The enhanced 500kbps data rate is backward compatible with applications designed for 250kbps operation.

Q: What is the difference between the MAX3244ECUI+ and MAX3244EEUI+ variants?

A: Both parts are identical in electrical performance (250kbps data rate, 500mV receiver hysteresis, 28-TSSOP package). The primary difference is operating temperature range: MAX3244ECUI+ operates 0°C to 70°C (commercial), while MAX3244EEUI+ operates -40°C to 85°C (extended). Select based on application temperature requirements.

Q: Why are the MAX3243 variants listed as not recommended?

A: The MAX3243 series operates at 120Kbps data rate and 300mV receiver hysteresis, both reduced from the original TRS3243IPWR specifications (250kbps and 500mV). These parts are suitable only for applications with lower bandwidth and relaxed noise immunity requirements. For equivalent performance, use TRS3243EIPWR, MAX3243IPWR, or ICL3243EIVZ.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel®, Tube, and Tape & Reel (TR). Select packaging based on production volume and assembly requirements. All parts maintain the identical 28-TSSOP physical package.

Q: Can I use the MAX3245ECUI+ as a substitute?

A: The MAX3245ECUI+ is not recommended as a direct substitute due to its restricted commercial operating temperature range (0°C to 70°C) versus the original -40°C to 85°C specification. Use this part only if your application operates within the 0°C to 70°C range and requires the enhanced 1Mbps data rate capability.

Q: Which substitute part offers the best inventory availability?

A: The TRS3243EIPWR offers the highest inventory availability at 76080 pcs, followed by the original TRS3243IPWR at 88400 pcs (though obsolete). For active parts, TRS3243EIPWR is the optimal choice for volume production requirements.

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