MAX3243CPWR Equivalent & Substitute Parts

Part Overview

The MAX3243CPWR is an active RS232 transceiver interface circuit manufactured by Texas Instruments, configured as a 3/5 full-duplex transceiver in a 28-TSSOP surface mount package. This component is classified as Active product status and is ROHS3 compliant. The MAX3243CPWR serves applications requiring RS232 serial communication with supply voltage flexibility across 3V to 5.5V operating ranges. Equivalent and substitute parts are identified when electrical parameters, mechanical packaging, and functional specifications align within acceptable tolerances for direct circuit board replacement or design flexibility.

Key Parameters

Parameter	MAX3243CPWR Specification
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	250 kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	28-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MAX3243CPWR are classified based on strict alignment with the following critical parameters: RS232 protocol compliance, 3/5 driver/receiver configuration, full-duplex operation, 28-pin TSSOP or compatible package geometry, 3V to 5.5V supply voltage range, and surface mount technology. Parts are grouped into three categories:

MFR Recommended Substitutes: Parts meeting all electrical and mechanical specifications with identical or superior performance characteristics and Active product status.

Direct Equivalents: Parts with identical base functionality and package compatibility but with variations in secondary parameters such as data rate or receiver hysteresis that do not affect circuit operation within the specified application envelope.

Upgrade Options: Parts offering extended operating temperature ranges or enhanced performance metrics while maintaining full backward compatibility with the original design.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Receiver Hysteresis	Operating Temperature	Package	Packaging Type	Inventory (Pcs)
MAX3243CPWR	Texas Instruments	3/5	250 kbps	500 mV	0°C ~ 70°C	28-TSSOP	Cut Tape (CT) & Digi-Reel®	45,100
SN75C3243PWR	Texas Instruments	3/5	1 Mbps	500 mV	0°C ~ 70°C	28-TSSOP	Cut Tape (CT) & Digi-Reel®	2,303
MAX3243ECUI+	Analog Devices Inc./Maxim Integrated	3/5	120 kbps	300 mV	0°C ~ 70°C	28-TSSOP	Tube	2,100
MAX3244ECUI+	Analog Devices Inc./Maxim Integrated	3/5	250 kbps	500 mV	0°C ~ 70°C	28-TSSOP	Tube	924
MAX3245ECUI+	Analog Devices Inc./Maxim Integrated	3/5	1 Mbps	500 mV	0°C ~ 70°C	28-TSSOP	Tube	5,200
MAX3243EEUI+	Analog Devices Inc./Maxim Integrated	3/5	120 kbps	300 mV	-40°C ~ 85°C	28-TSSOP	Tube	1,900
ICL3243ECAZ	Renesas Electronics Corporation	3/5	250 kbps	500 mV	0°C ~ 70°C	28-SSOP	Tube	2,716
ICL3243ECAZ-T	Renesas Electronics Corporation	3/5	250 kbps	500 mV	0°C ~ 70°C	28-SSOP	Tape & Reel (TR)	20,100
ICL3243ECVZ	Renesas Electronics Corporation	3/5	250 kbps	500 mV	0°C ~ 70°C	28-TSSOP	Tube	1,859
ICL3243EIAZ	Renesas Electronics Corporation	3/5	250 kbps	500 mV	-40°C ~ 85°C	28-SSOP	Tube	4,418
ICL3243EIAZ-T	Renesas Electronics Corporation	3/5	250 kbps	500 mV	-40°C ~ 85°C	28-SSOP	Cut Tape (CT) & Digi-Reel®	20,200

Engineering Selection Recommendations

Direct Substitution (Identical Specifications): ICL3243ECVZ and ICL3243ECAZ provide direct functional equivalence to MAX3243CPWR with matching 250 kbps data rate, 500 mV receiver hysteresis, and 0°C to 70°C operating temperature. Both are Active status products with ROHS3 compliance. ICL3243ECVZ maintains the 28-TSSOP package geometry identical to the original part. ICL3243ECAZ uses a 28-SSOP package (0.209" width versus 0.173" width), requiring PCB layout verification for pin-to-pin compatibility.

Performance Enhancement (Higher Data Rate): SN75C3243PWR and MAX3245ECUI+ offer 1 Mbps data rate capability while maintaining all other electrical parameters and supply voltage specifications. These parts are suitable for applications requiring higher serial communication bandwidth without thermal or power supply modifications.

Extended Temperature Range: MAX3243EEUI+ and ICL3243EIAZ/ICL3243EIAZ-T extend the operating temperature range to -40°C to 85°C, accommodating industrial and automotive environments. These parts maintain 250 kbps data rate and 500 mV receiver hysteresis specifications. ICL3243EIAZ-T provides the highest inventory availability at 20,200 units with Cut Tape & Digi-Reel packaging.

Packaging Considerations: All substitute parts maintain surface mount technology and 28-pin configurations. TSSOP packages (0.173" width) are mechanically interchangeable with the original MAX3243CPWR. SSOP packages (0.209" width) require PCB footprint adjustment but maintain electrical pin compatibility.

Frequently Asked Questions (FAQ)

Q: Can MAX3243ECUI+ replace MAX3243CPWR directly on the PCB?

A: MAX3243ECUI+ is electrically compatible as a 3/5 RS232 transceiver with identical supply voltage range and package type. However, the data rate is specified at 120 kbps versus 250 kbps for the original part. This substitution is valid for applications not requiring the full 250 kbps bandwidth. Packaging is Tube versus Cut Tape & Digi-Reel for the original part.

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

A: Both are 28-pin surface mount packages with identical pin assignments. The primary difference is package width: 28-TSSOP measures 0.173" (4.40mm) while 28-SSOP measures 0.209" (5.30mm). PCB footprints must accommodate the wider SSOP package. Pin pitch and electrical connectivity remain identical.

Q: Is ICL3243EIAZ-T suitable for automotive applications?

A: ICL3243EIAZ-T meets automotive temperature requirements with -40°C to 85°C operating range. It maintains 250 kbps data rate, 500 mV receiver hysteresis, and ROHS3 compliance. The part is available in high-volume Cut Tape & Digi-Reel packaging with 20,200 units in stock.

Q: Which substitute offers the best inventory availability?

A: ICL3243ECAZ-T and ICL3243EIAZ-T both provide 20,100 and 20,200 units respectively in Tape & Reel packaging. Both are Renesas Electronics Corporation products with identical electrical specifications to MAX3243CPWR except for package geometry (28-SSOP versus 28-TSSOP).

Q: Can I use SN75C3243PWR if my application requires higher data rates?

A: SN75C3243PWR is specified at 1 Mbps data rate, four times the 250 kbps specification of MAX3243CPWR. This part is suitable for applications requiring higher serial communication bandwidth. All other electrical parameters, supply voltage range, and package type remain compatible with the original design.

Q: What is the MSL (Moisture Sensitivity Level) difference between parts?

A: MAX3243CPWR and SN75C3243PWR are rated MSL 1 (Unlimited moisture exposure). Most Renesas ICL3243 variants are rated MSL 2 (1 Year) or MSL 3 (168 Hours). Lower MSL ratings require controlled storage and handling conditions. MSL 1 parts offer the most flexible storage and handling requirements.

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