TRSF3243CDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3243CDB is a full-duplex RS232 transceiver manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-SSOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across 3V to 5.5V supply voltage with a 1Mbps data rate and 500mV receiver hysteresis, suitable for legacy RS232 communication interfaces.

Key Parameters

Parameter	TRSF3243CDB Value
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	1Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	500 mV
Mounting Type	Surface Mount
Package / Case	28-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TRSF3243CDB is determined by strict alignment with the following critical parameters:

Core Compatibility Criteria:

Protocol: RS232
Number of Drivers/Receivers: 3/5 configuration
Duplex: Full
Receiver Hysteresis: 500 mV
Voltage Supply Range: 3V ~ 5.5V (minimum overlap required)
Package / Case: 28-SSOP (0.209", 5.30mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variations:

Data Rate: Parts with 250kbps or 1Mbps are functionally compatible (1Mbps parts are direct replacements; 250kbps parts operate within the same interface protocol)
Operating Temperature: Extended temperature ranges (-40°C ~ 85°C) are acceptable substitutes for the base range (0°C ~ 70°C)
Product Status: Active or Last Time Buy parts are preferred over obsolete status
Packaging Format: Tube, Tape & Reel, or Cut Tape formats are interchangeable for design purposes
MSL Rating: MSL 1 and MSL 2 are both acceptable for standard assembly processes

Substitute parts must maintain identical electrical interface characteristics and pinout compatibility within the 28-SSOP package footprint.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Operating Temp	Product Status	Packaging	Inventory
TRSF3243CDB	Texas Instruments	1Mbps	0°C ~ 70°C	Obsolete	-	918 Pcs
TRSF3243IDB	Texas Instruments	1Mbps	-40°C ~ 85°C	Last Time Buy	Tube	1130 Pcs
ICL3243ECAZ	Renesas Electronics	250kbps	0°C ~ 70°C	Active	Tube	2716 Pcs
ICL3243ECAZ-T	Renesas Electronics	250kbps	0°C ~ 70°C	Active	Tape & Reel	20100 Pcs
ICL3245CAZ-T	Renesas Electronics	1Mbps	0°C ~ 70°C	Active	Tape & Reel	1840 Pcs
ICL3245ECAZ-T	Renesas Electronics	1Mbps	0°C ~ 70°C	Active	Tape & Reel	2016 Pcs
MAX3243ECAI+	Analog Devices/Maxim	250kbps	0°C ~ 70°C	Active	Tube	3284 Pcs
MAX3243ECAI+T	Analog Devices/Maxim	250kbps	0°C ~ 70°C	Active	Cut Tape & Digi-Reel	1700 Pcs
MAX3244ECAI+	Analog Devices/Maxim	250kbps	0°C ~ 70°C	Active	Tube	2200 Pcs
MAX3244ECAI+T	Analog Devices/Maxim	250kbps	0°C ~ 70°C	Active	Tape & Reel	3580 Pcs
MAX3245ECAI+T	Analog Devices/Maxim	1Mbps	0°C ~ 70°C	Active	Tape & Reel	5800 Pcs

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

Parts with 1Mbps data rate and active product status provide direct functional replacement with enhanced supply chain availability:

MAX3245ECAI+T (Analog Devices/Maxim) — Active status, highest inventory, 1Mbps performance
ICL3245ECAZ-T (Renesas Electronics) — Active status, 1Mbps performance, established supply
ICL3245CAZ-T (Renesas Electronics) — Active status, 1Mbps performance

Secondary Substitutes (Reduced Data Rate):

Parts with 250kbps data rate remain functionally compatible for RS232 applications not requiring maximum throughput:

ICL3243ECAZ-T (Renesas Electronics) — Active status, highest inventory (20100 Pcs), established reliability
MAX3243ECAI+ (Analog Devices/Maxim) — Active status, established supply chain
MAX3244ECAI+T (Analog Devices/Maxim) — Active status, Tape & Reel packaging

Compliance & Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. MSL ratings of 1 and 2 are both suitable for standard surface mount assembly processes. Extended temperature range variants (TRSF3243IDB) provide additional operational margin for demanding environments.

Frequently Asked Questions (FAQ)

Q: Can I use a 250kbps substitute in place of the 1Mbps TRSF3243CDB?

A: Yes. The 250kbps parts (ICL3243ECAZ-T, MAX3243ECAI+, MAX3244ECAI+T) are functionally compatible substitutes. RS232 communication protocols support variable data rates, and 250kbps operation is valid for applications not requiring the full 1Mbps bandwidth. Verify your application's actual data rate requirement before selection.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is suitable for manual assembly or small-volume production. Tape & Reel packaging is optimized for automated pick-and-place assembly and high-volume manufacturing. Both formats contain identical components; selection depends on your assembly process and volume requirements.

Q: Are all substitute parts pin-compatible with the TRSF3243CDB?

A: Yes. All listed substitutes maintain the 28-SSOP package footprint (0.209", 5.30mm Width) and RS232 transceiver pinout configuration. Electrical interface characteristics (3/5 driver/receiver configuration, full-duplex operation, 500mV hysteresis) are identical across all substitutes.

Q: Why is TRSF3243IDB listed as "Last Time Buy" instead of "Active"?

A: Last Time Buy status indicates Texas Instruments has announced end-of-life for this part number. While still available, inventory is finite. For new designs or long-term production, select from Active status alternatives (Renesas or Analog Devices/Maxim parts) to ensure sustained supply availability.

Q: Do I need to test substitute parts before production use?

A: All listed substitutes meet identical electrical specifications, package requirements, and compliance certifications. Design validation should focus on confirming your application's actual data rate requirement and operating temperature range to select the most appropriate substitute.

Q: What is MSL rating and why does it matter?

A: Moisture Sensitivity Level (MSL) indicates how long a component can be exposed to ambient humidity before assembly. MSL 1 (Unlimited) allows indefinite storage. MSL 2 (1 Year) requires assembly within one year of packaging opening. Both ratings are acceptable for standard manufacturing; MSL 1 parts offer greater storage flexibility.

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