MAX243ESE+ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX243ESE+ is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC surface mount package. This interface IC operates across a 4.5V to 5.5V supply range with a 200 kbps data rate and is classified as an active product with ROHS3 compliance. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional equivalence within the RS232 transceiver category. Alternative parts may be required due to inventory availability, supply chain considerations, or specific application requirements.

Key Parameters

Parameter	MAX243ESE+
Manufacturer	Analog Devices Inc./Maxim Integrated
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Data Rate	200 kbps
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	500 mV
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MAX243ESE+ are classified based on strict electrical and mechanical parameter matching:

Parametric Equivalents share identical specifications across all critical parameters: 2/2 driver/receiver configuration, full-duplex RS232 protocol, 200 kbps data rate, 4.5V–5.5V supply voltage, -40°C to 85°C operating temperature range, 500 mV receiver hysteresis, and 16-SOIC package format.

Manufacturer-Recommended Alternatives maintain functional equivalence in RS232 transceiver operation and 16-SOIC packaging but may differ in specific parameters such as data rate, supply voltage range, receiver hysteresis, operating temperature limits, or moisture sensitivity level. These parts are suitable for applications where the parameter variations do not impact system performance.

Key Parameters Determining Substitution:

Protocol: RS232
Driver/Receiver Count: 2/2
Duplex Mode: Full
Package: 16-SOIC
Mounting: Surface Mount
Supply Voltage Compatibility
Operating Temperature Range
Data Rate Capability

Parameter Comparison

Part Number	Manufacturer	Data Rate	Voltage Supply	Operating Temp	Receiver Hysteresis	Product Status	Packaging
MAX243ESE+	Analog Devices Inc./Maxim Integrated	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	500 mV	Active	Tube
MAX232AESE+	Analog Devices Inc./Maxim Integrated	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	500 mV	Active	Tube
ICL3232IBNZ-T7A	Renesas Electronics Corporation	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	300 mV	Active	Tape & Reel
MAX202CD	Texas Instruments	120 kbps	4.5V ~ 5.5V	0°C ~ 70°C	500 mV	Obsolete	Tube
MAX202CDR	Texas Instruments	120 kbps	4.5V ~ 5.5V	0°C ~ 70°C	500 mV	Obsolete	Cut Tape & Digi-Reel
MAX202ID	Texas Instruments	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	500 mV	Obsolete	Tube
MAX202IDR	Texas Instruments	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	500 mV	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents): The MAX232AESE+ provides identical electrical and mechanical specifications to the MAX243ESE+, including matching data rate, supply voltage, operating temperature range, and receiver hysteresis. Both parts maintain active product status and ROHS3 compliance. This part is suitable for direct substitution without design modification.

For Extended Supply Voltage Range: The ICL3232IBNZ-T7A from Renesas Electronics extends the supply voltage range to 3V–5.5V, enabling operation in lower-voltage applications. This part exceeds the data rate specification at 250 kbps and maintains the full -40°C to 85°C operating temperature range. The reduced receiver hysteresis of 300 mV provides improved noise margin in certain applications. Packaging differs as Tape & Reel format. This part is suitable for applications requiring lower supply voltage operation.

For Legacy System Compatibility: The MAX202 series (MAX202CD, MAX202CDR, MAX202ID, MAX202IDR) represents obsolete product lines with reduced data rate capability (120 kbps). These parts maintain 16-SOIC packaging and RS232 protocol compliance. MAX202CD and MAX202CDR operate within a narrower temperature range (0°C–70°C), limiting suitability for extended temperature applications. MAX202ID and MAX202IDR support the full -40°C to 85°C range. Only MAX202IDR maintains active product status; remaining MAX202 variants are obsolete and should be avoided for new designs unless legacy system compatibility is mandatory.

Compliance Considerations: All listed parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can MAX232AESE+ replace MAX243ESE+ without PCB modification? A: Yes. The MAX232AESE+ is a parametric equivalent with identical electrical specifications, supply voltage, operating temperature range, data rate, and 16-SOIC package format. Direct substitution is possible without design changes.

Q: What are the advantages of ICL3232IBNZ-T7A over MAX243ESE+? A: The ICL3232IBNZ-T7A supports a lower minimum supply voltage (3V versus 4.5V), enabling operation in battery-powered or low-voltage applications. It also provides higher data rate capability (250 kbps versus 200 kbps). The reduced receiver hysteresis (300 mV) may improve noise immunity in certain signal environments. Packaging is supplied as Tape & Reel format rather than Tube.

Q: Why are MAX202 series parts listed as obsolete? A: The MAX202 series represents legacy transceiver designs with reduced data rate (120 kbps) and limited operating temperature ranges in some variants. These parts are no longer in active production. MAX202CD and MAX202CDR are restricted to 0°C–70°C operation, unsuitable for industrial temperature applications. Only MAX202IDR maintains active status with full temperature range support.

Q: Are all substitute parts available in the same package? A: All substitute parts use the 16-SOIC package format, ensuring mechanical compatibility. Packaging format (Tube, Cut Tape & Digi-Reel, or Tape & Reel) differs based on supplier and part variant but does not affect PCB mounting or electrical function.

Q: Which substitute part should be selected for new designs? A: For new designs, MAX232AESE+ is recommended as the primary equivalent due to identical specifications and active product status. ICL3232IBNZ-T7A is suitable if extended supply voltage range or higher data rate is required. MAX202 series parts should be avoided for new designs due to obsolete status.

Q: Does receiver hysteresis variation affect circuit compatibility? A: Receiver hysteresis determines the voltage differential required for input signal transitions. MAX243ESE+ and most substitutes specify 500 mV hysteresis. ICL3232IBNZ-T7A specifies 300 mV, providing tighter input thresholds. This variation does not prevent substitution but may affect noise immunity in high-noise environments. System-level signal integrity analysis is recommended if hysteresis variation is critical to application performance.

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