TRSF3243CPWR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3243CPWR is a full-duplex RS232 transceiver manufactured by Texas Instruments, designed for 3/5 driver/receiver configurations in 28-TSSOP surface mount packaging. This part operates across 3V to 5.5V supply voltage with a 1Mbps data rate and 500mV receiver hysteresis. The TRSF3243CPWR is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRSF3243CPWR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	1Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TRSF3243CPWR is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

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 Compliance: ROHS3 Compliant or RoHS Compliant

Secondary Compatibility Parameters:

Receiver Hysteresis: 500 mV (preferred match)
Data Rate: 1Mbps (preferred match)
Operating Temperature: 0°C ~ 70°C (minimum requirement)
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into three categories based on parameter alignment:

MFR Recommended Substitute: TRSF3243IPWR matches all primary criteria with extended operating temperature range (-40°C ~ 85°C) and active product status.

Parametric Equivalents: SN75C3243PWR and MAX3245ECUI+T match all primary criteria and secondary parameters with active product status.

Direct Substitutes: MAX3243ECUI+, MAX3243ECUI+T, MAX3244ECUI+, MAX3245ECUI+, SP3243EBCY-L/TR, and SP3243EUCY-L/TR meet primary substitution criteria with variations in receiver hysteresis and data rate specifications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status
TRSF3243CPWR	Texas Instruments	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Obsolete
TRSF3243IPWR	Texas Instruments	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active
SN75C3243PWR	Texas Instruments	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3243ECUI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	300 mV	120Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3243ECUI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	300 mV	120Kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3244ECUI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3245ECUI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
MAX3245ECUI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
SP3243EBCY-L/TR	MaxLinear, Inc.	RS232	3/5	300 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active
SP3243EUCY-L/TR	MaxLinear, Inc.	RS232	3/5	300 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active

Engineering Selection Recommendations

Primary Selection: TRSF3243IPWR is the manufacturer-recommended substitute, offering identical electrical specifications to the TRSF3243CPWR with extended operating temperature range (-40°C ~ 85°C) and active product status. This part maintains full compatibility with existing designs while providing improved temperature performance.

Secondary Selection: SN75C3243PWR provides parametric equivalence with identical receiver hysteresis (500 mV) and data rate (1Mbps) specifications. This Texas Instruments part maintains the original operating temperature range and is actively manufactured.

Alternative Selections: MAX3245ECUI+ and MAX3245ECUI+T deliver full parameter matching with 1Mbps data rate and 500mV receiver hysteresis. Both parts are actively produced by Analog Devices Inc./Maxim Integrated and meet ROHS3 compliance requirements.

Conditional Selections: MAX3243ECUI+, MAX3243ECUI+T, SP3243EUCY-L/TR, and MAX3244ECUI+ are suitable for applications where reduced receiver hysteresis (300 mV) or lower data rates (120Kbps to 250kbps) are acceptable. These parts maintain full 28-TSSOP package compatibility and active manufacturing status.

All substitute parts maintain ROHS3 or RoHS compliance, MSL Level 1 (Unlimited) moisture sensitivity, and surface mount 28-TSSOP packaging identical to the original TRSF3243CPWR specification.

Frequently Asked Questions (FAQ)

Q: Can TRSF3243IPWR directly replace TRSF3243CPWR in existing designs?

A: Yes. TRSF3243IPWR is the manufacturer-recommended substitute with identical electrical specifications. The extended operating temperature range (-40°C ~ 85°C) provides additional performance margin compared to the original 0°C ~ 70°C range. Pin configuration and 28-TSSOP package dimensions are identical.

Q: What is the difference between MAX3243ECUI+ and MAX3245ECUI+?

A: Both parts are 3/5 full-duplex RS232 transceivers in 28-TSSOP packaging. MAX3243ECUI+ operates at 120Kbps with 300mV receiver hysteresis. MAX3245ECUI+ operates at 1Mbps with 500mV receiver hysteresis, matching the original TRSF3243CPWR data rate and hysteresis specifications.

Q: Are SP3243EUCY-L/TR and SP3243EBCY-L/TR interchangeable?

A: Both are MaxLinear SP3243 series transceivers in 28-TSSOP packaging with 3/5 driver/receiver configuration. SP3243EUCY-L/TR supports 1Mbps data rate with 300mV hysteresis. SP3243EBCY-L/TR supports 250kbps data rate with 300mV hysteresis. Selection depends on required data rate performance.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Cut Tape (CT), Digi-Reel, Tube, and Tape & Reel (TR) packaging. All maintain identical 28-TSSOP case dimensions (0.173", 4.40mm Width) and surface mount mounting type. Packaging selection does not affect electrical performance or pin compatibility.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All listed substitute parts are ROHS3 Compliant or RoHS Compliant. The original TRSF3243CPWR and all recommended substitutes meet ROHS3 compliance with MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute part offers the best temperature performance?

A: TRSF3243IPWR provides the widest operating temperature range at -40°C ~ 85°C, compared to the original 0°C ~ 70°C specification. This extended range is beneficial for industrial and automotive applications requiring broader temperature operation.

Q: Can parts with different receiver hysteresis values be used interchangeably?

A: Receiver hysteresis affects input threshold characteristics. The original TRSF3243CPWR specifies 500mV hysteresis. Substitutes with 300mV hysteresis (MAX3243ECUI+, SP3243 series) have tighter input thresholds and may require circuit evaluation for noise immunity in specific applications. Parts with matching 500mV hysteresis (MAX3244ECUI+, MAX3245ECUI+, SN75C3243PWR) provide direct electrical equivalence.

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