TRSF3243IDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3243IDB is a 3/5 full-duplex RS232 transceiver manufactured by Texas Instruments in 28-SSOP surface mount packaging. This interface IC operates across 3V to 5.5V supply voltage with a 1Mbps data rate and 500mV receiver hysteresis, designed for serial communication applications requiring bidirectional RS232 protocol support.

The TRSF3243IDB is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Transceiver Type	3/5 Full-Duplex RS232
Data Rate	1Mbps
Supply Voltage Range	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Receiver Hysteresis	500mV
Package Type	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 TRSF3243IDB is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232 full-duplex transceiver
Driver/Receiver Configuration: 3/5 channels
Package: 28-SSOP (0.209", 5.30mm Width) for direct pin-compatible replacement
Operating Temperature Range: -40°C ~ 85°C
Supply Voltage: 3V ~ 5.5V minimum overlap

Secondary Compatibility Criteria:

Data Rate: 1Mbps or higher (250kbps parts are functional but operate at reduced maximum speed)
Receiver Hysteresis: 500mV
RoHS3 Compliance
Surface Mount technology

Substitute parts are grouped into two categories:

Category 1 - Direct Pin-Compatible Substitutes (Same Package): Parts maintaining identical 28-SSOP package dimensions and pinout, allowing direct PCB replacement without layout modification.

Category 2 - Functional Equivalents (Alternative Packaging): Parts with identical electrical specifications and pinout but different packaging formats (Tape & Reel, Cut Tape), suitable for new production designs or when packaging format is not a constraint.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Package	Temp Range	Product Status	MSL
TRSF3243IDB	Texas Instruments	RS232	3/5	1Mbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Last Time Buy	1
TRSF3243EIPWR	Texas Instruments	RS232	3/5	1Mbps	3V ~ 3.6V, 4.5V ~ 5.5V	28-TSSOP	-40°C ~ 85°C	Active	1
ICL3243EIAZ	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	2
ICL3243EIAZ-T	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	2
ICL3244EIAZ	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	2
ICL3244EIAZ-T	Renesas Electronics	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	2
ICL3245EIAZ-T	Renesas Electronics	RS232	3/5	1Mbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	2
MAX3243EEAI+	Analog Devices/Maxim	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	1
MAX3243EEAI+T	Analog Devices/Maxim	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	1
MAX3244EEAI+	Analog Devices/Maxim	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	1
MAX3244EEAI+T	Analog Devices/Maxim	RS232	3/5	250kbps	3V ~ 5.5V	28-SSOP	-40°C ~ 85°C	Active	1

Engineering Selection Recommendations

Primary Recommendation - Active Production Status:

The TRSF3243EIPWR (Texas Instruments, Active status) is the manufacturer-recommended direct successor. While packaged in 28-TSSOP format rather than 28-SSOP, it maintains identical electrical specifications including 1Mbps data rate, 3/5 transceiver configuration, and full temperature/voltage operating range. This part is suitable for new designs where packaging format flexibility exists.

Pin-Compatible Direct Replacements (28-SSOP Package):

For applications requiring identical 28-SSOP package footprint without PCB redesign:

ICL3245EIAZ-T (Renesas Electronics, Active) matches the 1Mbps data rate specification and maintains full supply voltage range compatibility. MSL rating of 2 (1 Year) requires standard moisture control during storage and assembly.
MAX3243EEAI+ and MAX3243EEAI+T (Analog Devices/Maxim, Active) provide 28-SSOP pin compatibility with MSL 1 (Unlimited) moisture sensitivity rating, offering superior shelf-life characteristics. Data rate specification of 250kbps is functional for applications not requiring maximum 1Mbps throughput.

Alternative Substitutes (Reduced Data Rate):

ICL3243EIAZ, ICL3243EIAZ-T, ICL3244EEAI+, and ICL3244EEAI+T operate at 250kbps maximum data rate. These parts are electrically and mechanically compatible with the TRSF3243IDB but are suitable only for applications where serial communication speed does not exceed 250kbps.

All substitute parts maintain ROHS3 compliance, -40°C to 85°C operating temperature range, and 500mV receiver hysteresis specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 250kbps data rate in place of the TRSF3243IDB rated for 1Mbps?

A: Substitution is possible only if your application's actual data rate requirement does not exceed 250kbps. The TRSF3243IDB is rated for 1Mbps maximum; using a 250kbps-rated substitute in a 1Mbps application will result in communication errors or data loss. Verify your system's actual serial communication speed before selecting a lower-rated substitute.

Q: What is the difference between 28-SSOP and 28-TSSOP packaging?

A: Both are 28-pin surface mount packages with identical pinout and electrical compatibility. The primary difference is physical dimensions: 28-SSOP has a 0.209" width (5.30mm), while 28-TSSOP has a 0.173" width (4.40mm). The TRSF3243EIPWR in 28-TSSOP format requires PCB layout modification if direct footprint replacement is required. For existing PCB designs, select 28-SSOP packaged alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification, matching the original TRSF3243IDB compliance status. All parts are also REACH Unaffected and classified under ECCN EAR99.

Q: What does MSL rating mean, and why do ICL parts have MSL 2 while MAX parts have MSL 1?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be stored in standard conditions before moisture absorption affects reliability. MSL 1 (Unlimited) allows indefinite storage without special moisture control. MSL 2 (1 Year) requires components to be used within one year of manufacture or stored in controlled humidity environments. For applications with extended inventory holding periods, MAX3243 and MAX3244 series parts with MSL 1 rating are preferred.

Q: Can I substitute the TRSF3243IDB with TRSF3243EIPWR in an existing design without PCB modification?

A: No. The TRSF3243EIPWR uses 28-TSSOP packaging (0.173" width) while the original uses 28-SSOP (0.209" width). Although pinout is identical, the physical footprint differs, requiring PCB layout redesign. For drop-in replacement without PCB changes, select 28-SSOP packaged alternatives such as ICL3245EIAZ-T or MAX3243EEAI+.

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

A: All listed substitutes carry Active product status, indicating ongoing manufacturer support. Renesas Electronics (ICL series) and Analog Devices/Maxim (MAX series) are established suppliers with broad distribution networks. For new designs, TRSF3243EIPWR from Texas Instruments provides manufacturer continuity, though packaging format differs from the original.

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