MAX3243CWI RS232 Transceiver Interface IC Equivalent & Substitute Parts

Part Overview

The MAX3243CWI is a full-duplex RS232 transceiver interface IC manufactured by Analog Devices Inc./Maxim Integrated, configured with 3 drivers and 5 receivers in a 28-SOIC surface mount package. This component operates across 3V to 5.5V supply voltage with a 120 kbps data rate and 300 mV receiver hysteresis, supporting industrial and commercial communication applications.

The MAX3243CWI is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and meet current RoHS compliance requirements for new production runs and system upgrades.

Key Parameters

Parameter	MAX3243CWI
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	120 kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	28-SOIC (0.295", 7.50mm Width)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the MAX3243CWI are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine valid substitution:

Critical Matching Parameters:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount
Package / Case: 28-SOIC (0.295", 7.50mm Width)

Allowable Parameter Variations:

Receiver Hysteresis: 300 mV (primary) or 500 mV (acceptable for enhanced noise immunity)
Data Rate: 120 kbps (primary) up to 500 kbps (backward compatible)
Operating Temperature: 0°C ~ 70°C (primary) or -40°C ~ 85°C (extended range, backward compatible)
RoHS Status: Active compliance preferred; obsolete parts acceptable for legacy applications
Product Status: Active or Last Time Buy acceptable; Obsolete acceptable for replacement scenarios

Substitutes are grouped by manufacturer recommendation level and product status to facilitate selection based on supply chain requirements and compliance mandates.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
MAX3243CWI	Analog Devices/Maxim	RS232	3/5	Full	300 mV	120 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Obsolete	Non-compliant
MAX3243CWI+	Analog Devices/Maxim	RS232	3/5	Full	300 mV	120 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	ROHS3 Compliant
TRS3243ECDW	Texas Instruments	RS232	3/5	Full	500 mV	500 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Last Time Buy	ROHS3 Compliant
ICL3243CBZ	Renesas Electronics	RS232	3/5	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	ROHS3 Compliant
ICL3243CBZ-T	Renesas Electronics	RS232	3/5	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	ROHS3 Compliant
MAX3243CDW	Texas Instruments	RS232	3/5	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Obsolete	ROHS3 Compliant
MAX3243CDWR	Texas Instruments	RS232	3/5	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	ROHS3 Compliant
MAX3243ECDW	Texas Instruments	RS232	3/5	Full	500 mV	500 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Last Time Buy	ROHS3 Compliant
MAX3243ECDWR	Texas Instruments	RS232	3/5	Full	500 mV	500 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SOIC	Active	ROHS3 Compliant
MAX3243EIDW	Texas Instruments	RS232	3/5	Full	500 mV	500 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Last Time Buy	ROHS3 Compliant
MAX3243EIDWR	Texas Instruments	RS232	3/5	Full	500 mV	500 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS Compliance Requirement: Select MAX3243CWI+ as the direct parametric equivalent. This part maintains identical electrical specifications (300 mV receiver hysteresis, 120 kbps data rate, 0°C ~ 70°C operating range) while achieving ROHS3 compliance and Active product status. Packaging is Tube format.

For Active Product Status with Standard Performance: ICL3243CBZ or ICL3243CBZ-T (Renesas Electronics) provide Active status with ROHS3 compliance. These parts operate at 250 kbps data rate with 300 mV receiver hysteresis, matching the original operating temperature range. ICL3243CBZ-T offers Tape & Reel packaging for high-volume production; ICL3243CBZ provides Tube packaging for lower-volume applications.

For Active Product Status with Enhanced Performance: MAX3243CDWR or MAX3243ECDWR (Texas Instruments) deliver Active status with ROHS3 compliance. MAX3243CDWR operates at 250 kbps with 300 mV hysteresis. MAX3243ECDWR provides enhanced performance at 500 kbps data rate with 500 mV receiver hysteresis, suitable for noise-sensitive environments.

For Extended Temperature Range Applications: MAX3243EIDWR (Texas Instruments) supports -40°C ~ 85°C operating temperature with 500 kbps data rate and 500 mV receiver hysteresis. This part is Active status with ROHS3 compliance and Tape & Reel packaging.

For Legacy System Replacement: MAX3243CDW (Texas Instruments) provides Obsolete status with ROHS3 compliance and 250 kbps performance, suitable for direct replacement in existing designs where supply chain continuity is prioritized over new product adoption.

Frequently Asked Questions (FAQ)

Q: Can MAX3243CWI+ directly replace MAX3243CWI without circuit modification?

A: Yes. MAX3243CWI+ maintains identical electrical parameters: 3/5 driver/receiver configuration, 300 mV receiver hysteresis, 120 kbps data rate, 3V ~ 5.5V supply voltage, and 28-SOIC package. The primary difference is Active product status and ROHS3 compliance. No circuit redesign is required.

Q: What is the impact of selecting a substitute with 500 mV receiver hysteresis instead of 300 mV?

A: 500 mV receiver hysteresis provides increased noise immunity and reduced susceptibility to signal reflections on RS232 communication lines. This is a backward-compatible enhancement suitable for electrically noisy environments. The original 300 mV specification remains the baseline requirement.

Q: Are Tube and Tape & Reel packaging variants electrically equivalent?

A: Yes. Tube (standard packaging) and Tape & Reel (TR) variants of the same part number contain identical die and electrical performance. Packaging selection depends on production volume and assembly automation requirements. Tube packaging is standard for lower volumes; Tape & Reel is optimized for high-speed automated pick-and-place assembly.

Q: Can parts with higher data rates (250 kbps or 500 kbps) replace the 120 kbps MAX3243CWI?

A: Yes. Higher data rate specifications are backward compatible. A 250 kbps or 500 kbps transceiver operates correctly at 120 kbps communication speeds. Selection of higher-performance parts depends on supply availability and cost considerations.

Q: What is the significance of Last Time Buy product status?

A: Last Time Buy indicates the manufacturer has announced end-of-life for that part number. Existing inventory is available for purchase, but no future production is planned. These parts are suitable for immediate replacement needs but should not be selected for new long-term production designs. Active status parts are preferred for new designs.

Q: Does operating temperature range affect RS232 signal integrity?

A: Operating temperature range specifies the thermal environment in which the transceiver maintains specified electrical performance. The 0°C ~ 70°C range (commercial) differs from -40°C ~ 85°C (industrial/extended). Selection depends on the target application environment. Extended range parts are backward compatible with commercial temperature requirements.

Q: Are Renesas ICL3243 parts pin-compatible with Maxim MAX3243 parts?

A: Yes. All substitute parts listed maintain identical 28-SOIC pinout and functional pin assignments for 3/5 driver/receiver RS232 transceiver operation. Physical and electrical pin compatibility is confirmed across all listed substitutes.

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