MAX3243CDW Equivalent & Substitute Parts

Part Overview

The MAX3243CDW is a full RS232 transceiver IC manufactured by Texas Instruments, designed for 3/5 driver/receiver configurations in 28-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MAX3243CDW operates across 3V to 5.5V supply voltage with a 250kbps data rate and 300mV receiver hysteresis, suitable for legacy RS232 communication applications requiring full-duplex operation.

Key Parameters

Parameter	MAX3243CDW
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	250kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	28-SOIC (0.295", 7.50mm Width)
Receiver Hysteresis	300 mV
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX3243CDW is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Allowable Variations:

Data Rate: Substitute parts may exceed 250kbps (higher data rates are backward compatible)
Operating Temperature: Substitute parts may exceed 0°C ~ 70°C range (wider temperature ranges are acceptable)
Receiver Hysteresis: Substitute parts may differ (300mV or 500mV both acceptable for RS232 operation)
Product Status: Active parts are preferred over obsolete parts
Packaging Format: Tube or Tape & Reel formats are interchangeable for the same part number

Substitute parts are grouped by manufacturer and base product number to maintain functional equivalence while accommodating procurement availability.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Operating Temp	Receiver Hysteresis	Packaging	Product Status	Inventory
MAX3243CDW	Texas Instruments	250kbps	0°C ~ 70°C	300 mV	Tube	Obsolete	923 Pcs
MAX3243CDWR	Texas Instruments	250kbps	0°C ~ 70°C	300 mV	Tape & Reel	Active	2196 Pcs
MAX3243EEWI+	Analog Devices Inc./Maxim Integrated	250kbps	-40°C ~ 85°C	500 mV	Tube	Active	820 Pcs
ICL3243CBZ-T	Renesas Electronics Corporation	250kbps	0°C ~ 70°C	300 mV	Tape & Reel	Active	1586 Pcs
MAX3243CWI+	Analog Devices Inc./Maxim Integrated	120Kbps	0°C ~ 70°C	300 mV	Tube	Active	997 Pcs
MAX3243CWI+T	Analog Devices Inc./Maxim Integrated	120Kbps	0°C ~ 70°C	300 mV	Tape & Reel	Active	2300 Pcs
MAX3243EEWI+T	Analog Devices Inc./Maxim Integrated	250kbps	-40°C ~ 85°C	500 mV	Not Specified	Active	2100 Pcs
MAX3243EWI+	Analog Devices Inc./Maxim Integrated	120Kbps	-40°C ~ 85°C	300 mV	Tube	Active	972 Pcs
MAX3243EWI+T	Analog Devices Inc./Maxim Integrated	120Kbps	-40°C ~ 85°C	300 mV	Not Specified	Active	950 Pcs
MAX3244ECWI+	Analog Devices Inc./Maxim Integrated	250kbps	0°C ~ 70°C	500 mV	Tube	Active	1024 Pcs
MAX3245ECWI+	Analog Devices Inc./Maxim Integrated	1Mbps	0°C ~ 70°C	500 mV	Tube	Active	1041 Pcs

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): MAX3243CDWR is the direct equivalent of MAX3243CDW, differing only in packaging format (Tape & Reel vs. Tube). This part maintains identical electrical specifications and is manufactured by Texas Instruments with active product status, ensuring long-term availability and support.

Secondary Substitutes (Functional Equivalents): ICL3243CBZ-T (Renesas Electronics Corporation) provides identical electrical performance to the MAX3243CDW with matching data rate, receiver hysteresis, and operating temperature range. This part is actively manufactured and available in Tape & Reel packaging.

MAX3243EEWI+ and MAX3243EEWI+T (Analog Devices Inc./Maxim Integrated) offer enhanced operating temperature range (-40°C ~ 85°C) and higher receiver hysteresis (500mV), suitable for applications requiring extended thermal performance. Data rate remains at 250kbps.

MAX3244ECWI+ (Analog Devices Inc./Maxim Integrated) maintains 250kbps data rate with 500mV receiver hysteresis and 0°C ~ 70°C operating range, providing alternative sourcing from Analog Devices.

MAX3245ECWI+ (Analog Devices Inc./Maxim Integrated) supports higher data rates (1Mbps) with 500mV receiver hysteresis, suitable for applications requiring increased communication speed within the same package footprint.

Lower Priority Substitutes: MAX3243CWI+, MAX3243CWI+T, MAX3243EWI+, and MAX3243EWI+T operate at reduced data rates (120Kbps). These parts are suitable only for applications where lower data rates are acceptable and do not require the full 250kbps capability of the original part.

All substitute parts maintain ROHS3 compliance, MSL rating of 1 (Unlimited), and identical 28-SOIC package dimensions, ensuring mechanical and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can MAX3243CDWR be used as a direct replacement for MAX3243CDW? A: Yes. MAX3243CDWR is electrically identical to MAX3243CDW. The only difference is packaging format: MAX3243CDWR uses Tape & Reel while MAX3243CDW uses Tube. Both are 28-SOIC surface mount packages with identical pin configurations and electrical specifications.

Q: What is the difference between MAX3243EEWI+ and MAX3243CWI+? A: Both are Analog Devices MAX3243 variants in 28-SOIC packaging. MAX3243EEWI+ operates at 250kbps with -40°C ~ 85°C temperature range and 500mV receiver hysteresis. MAX3243CWI+ operates at 120Kbps with 0°C ~ 70°C temperature range and 300mV receiver hysteresis. Selection depends on required data rate and operating temperature.

Q: Is ICL3243CBZ-T from Renesas compatible with MAX3243CDW? A: Yes. ICL3243CBZ-T is functionally equivalent with identical RS232 protocol, 3/5 driver/receiver configuration, 250kbps data rate, 300mV receiver hysteresis, and 0°C ~ 70°C operating range. Package and pin configuration are identical 28-SOIC.

Q: Can MAX3245ECWI+ replace MAX3243CDW in existing designs? A: MAX3245ECWI+ is mechanically and electrically compatible in terms of package, supply voltage, and pin configuration. However, it operates at 1Mbps data rate compared to MAX3243CDW's 250kbps. Use only if the application can accommodate higher data rate capability or if data rate is not a limiting factor.

Q: What does the "+T" suffix indicate in part numbers like MAX3243CWI+T? A: The "+T" suffix indicates Tape & Reel packaging format, suitable for automated assembly processes. Parts without "+T" are typically supplied in Tube packaging. Electrical specifications remain identical between packaging formats.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for applications requiring RoHS certification.

Q: What is the significance of receiver hysteresis differences (300mV vs 500mV)? A: Both 300mV and 500mV receiver hysteresis values are acceptable for RS232 operation. Higher hysteresis (500mV) provides improved noise immunity in electrically noisy environments. Selection depends on application requirements.

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