SN65C3243PW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN65C3243PW 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, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a 3V to 5.5V supply range with a 1Mbps data rate and is suitable for legacy RS232 communication applications requiring full-duplex operation.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN65C3243PW
Product Status	Obsolete
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	1Mbps
Voltage Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	500 mV
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN65C3243PW is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Protocol: RS232
Drivers/Receivers: 3/5 configuration
Duplex: Full
Voltage Supply: 3V ~ 5.5V
Operating Temperature: -40°C ~ 85°C
Package: 28-TSSOP (0.173", 4.40mm Width)
Data Rate: 1Mbps minimum
Receiver Hysteresis: 500 mV

Secondary Considerations:

Product Status: Active parts are preferred over obsolete
RoHS Compliance: ROHS3 Compliant
Packaging Format: Tube, Cut Tape (CT) & Digi-Reel®, or Tape & Reel (TR)

Substitute parts are grouped into two categories: direct equivalents matching all primary criteria, and functional alternatives with minor parameter variations that remain within acceptable operating ranges for RS232 applications.

Parameter Comparison

Part Number	Manufacturer	Status	Drivers/Receivers	Data Rate	Voltage Supply	Operating Temp	Package	Receiver Hysteresis	RoHS
SN65C3243PW	Texas Instruments	Obsolete	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500 mV	ROHS3
SN65C3243PWR	Texas Instruments	Active	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500 mV	ROHS3
MAX3245EEUI+T	Analog Devices Inc./Maxim Integrated	Active	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500 mV	ROHS3
SP3243EUEY-L/TR	MaxLinear, Inc.	Active	3/5	1Mbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	300 mV	RoHS
ICL3243ECVZ-T	Renesas Electronics Corporation	Active	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	500 mV	ROHS3
ICL3243EIVZ	Renesas Electronics Corporation	Active	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	500 mV	ROHS3
ICL3243ECAZ-T	Renesas Electronics Corporation	Active	3/5	250kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	500 mV	ROHS3
ICL3243EIAZ-T	Renesas Electronics Corporation	Active	3/5	250kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	500 mV	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): SN65C3243PWR is the direct active equivalent from Texas Instruments, matching all electrical and mechanical parameters of the obsolete SN65C3243PW. This part maintains identical performance specifications and is the preferred choice for design continuity.

Full-Duplex RS232 Transceiver Alternatives (28-TSSOP Package): MAX3245EEUI+T from Analog Devices Inc./Maxim Integrated provides complete parameter alignment with the original part, including 1Mbps data rate and -40°C to 85°C operating range. This part is actively manufactured and ROHS3 compliant.

SP3243EUEY-L/TR from MaxLinear, Inc. operates within the same electrical envelope with a reduced receiver hysteresis specification (300 mV versus 500 mV), suitable for applications where tighter input thresholds are acceptable.

Extended Temperature Range Alternative (28-TSSOP Package): ICL3243EIVZ from Renesas Electronics Corporation maintains the full -40°C to 85°C operating temperature range with 28-TSSOP packaging. The 250kbps data rate specification remains adequate for standard RS232 communication protocols.

Industrial Temperature Range Options (28-SSOP Package): ICL3243EIAZ-T from Renesas Electronics Corporation provides the extended -40°C to 85°C operating range in 28-SSOP packaging (0.209", 5.30mm width). This package variant requires PCB layout adjustment but maintains full electrical compatibility.

ICL3243ECAZ-T from Renesas Electronics Corporation operates within the 0°C to 70°C industrial temperature range in 28-SSOP packaging, suitable for controlled environment applications.

Product Status Consideration: All recommended substitutes maintain active manufacturing status, ensuring long-term availability and supply chain stability compared to the obsolete SN65C3243PW.

Frequently Asked Questions (FAQ)

Q: Can SN65C3243PWR be used as a direct replacement for SN65C3243PW? A: Yes. SN65C3243PWR is the active equivalent from Texas Instruments with identical electrical specifications, operating temperature range, data rate, and 28-TSSOP packaging. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube).

Q: What is the difference between 28-TSSOP and 28-SSOP packages? A: Both are surface mount packages with 28 pins. The 28-TSSOP has a width of 0.173" (4.40mm), while the 28-SSOP has a width of 0.209" (5.30mm). PCB footprints differ and are not interchangeable without layout modification.

Q: Can I use ICL3243 series parts as substitutes? A: ICL3243 series parts are functionally compatible RS232 transceivers with 3/5 driver/receiver configuration. However, they specify a 250kbps data rate versus the 1Mbps of the original part. For applications operating below 250kbps, these parts are suitable. The ICL3243EIVZ maintains the -40°C to 85°C temperature range in 28-TSSOP packaging.

Q: Does SP3243EUEY-L/TR have different electrical performance? A: SP3243EUEY-L/TR specifies 300 mV receiver hysteresis compared to 500 mV in the original part. This represents tighter input threshold specifications and is functionally compatible for standard RS232 applications. All other electrical parameters align with the original specification.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitutes are either ROHS3 Compliant or RoHS Compliant, meeting environmental and regulatory requirements equivalent to the original SN65C3243PW.

Q: What is the MSL (Moisture Sensitivity Level) impact when selecting substitutes? A: The original SN65C3243PW has MSL 1 (Unlimited). Most substitutes maintain MSL 1 or MSL 2 (1 Year) ratings. ICL3243 series parts in 28-TSSOP specify MSL 3 (168 Hours), requiring controlled storage conditions. Verify MSL requirements against your manufacturing process.

Q: Can I mix packaging formats in production? A: Packaging format (Tube, Cut Tape & Digi-Reel®, Tape & Reel) affects handling and automated assembly but does not impact electrical performance. Select based on your procurement and assembly process requirements.

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