MAX3243EUI RS232 Transceiver Interface IC Equivalent & Substitute Parts

Part Overview

The MAX3243EUI 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-TSSOP surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The MAX3243EUI operates across a 3V to 5.5V supply range with a 120 kbps data rate and 300 mV receiver hysteresis, suitable for legacy RS232 communication applications requiring full-duplex operation.

Key Parameters

Parameter	Specification
Manufacturer Part Number	MAX3243EUI
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Category	Interface
Type	Transceiver
Protocol	RS232
Driver/Receiver Configuration	3/5
Duplex Mode	Full
Package / Case	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage Supply Range	3V ~ 5.5V
Operating Temperature Range	-40°C ~ 85°C
Data Rate	120 kbps
Receiver Hysteresis	300 mV
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3243EUI is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232
Driver/Receiver Configuration: 3/5
Duplex Mode: Full
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount
Package Type: 28-TSSOP or 28-SSOP

Acceptable Variation Parameters:

Data Rate: Substitute parts may exceed 120 kbps (higher data rates are backward compatible)
Receiver Hysteresis: Substitute parts may differ from 300 mV (500 mV is acceptable for RS232 applications)
Operating Temperature Range: Substitute parts may have narrower or wider ranges; -40°C ~ 85°C is the reference
Product Status: Active parts are preferred over obsolete parts
RoHS Compliance: ROHS3 compliant parts are preferred for new designs
Moisture Sensitivity Level: Variations are acceptable based on application requirements

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications with different packaging or compliance status) and manufacturer-recommended alternatives (functionally equivalent with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Protocol	Driver/Receiver	Package	Voltage Supply	Operating Temp	Data Rate	Receiver Hysteresis	Product Status	RoHS Status
MAX3243EUI	Analog Devices/Maxim	RS232	3/5	28-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	120 kbps	300 mV	Obsolete	Non-compliant
MAX3243EEUI+	Analog Devices/Maxim	RS232	3/5	28-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	120 kbps	300 mV	Active	ROHS3 Compliant
MAX3243EUI+	Analog Devices/Maxim	RS232	3/5	28-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	120 kbps	300 mV	Active	ROHS3 Compliant
ICL3243ECAZ	Renesas Electronics	RS232	3/5	28-SSOP	3V ~ 5.5V	0°C ~ 70°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243ECAZ-T	Renesas Electronics	RS232	3/5	28-SSOP	3V ~ 5.5V	0°C ~ 70°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243ECVZ	Renesas Electronics	RS232	3/5	28-TSSOP	3V ~ 5.5V	0°C ~ 70°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243ECVZ-T	Renesas Electronics	RS232	3/5	28-TSSOP	3V ~ 5.5V	0°C ~ 70°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243EIAZ	Renesas Electronics	RS232	3/5	28-SSOP	3V ~ 5.5V	-40°C ~ 85°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243EIAZ-T	Renesas Electronics	RS232	3/5	28-SSOP	3V ~ 5.5V	-40°C ~ 85°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243EIVZ	Renesas Electronics	RS232	3/5	28-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	250 kbps	500 mV	Active	ROHS3 Compliant
ICL3243EIVZ-T	Renesas Electronics	RS232	3/5	28-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	250 kbps	500 mV	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Maxim Integrated):

MAX3243EEUI+ and MAX3243EUI+ are direct parametric equivalents to the MAX3243EUI, maintaining identical electrical specifications while offering active product status and ROHS3 compliance. These parts are sourced from the same manufacturer and represent the primary replacement path for obsolete MAX3243EUI inventory. Both parts are available in tube packaging and provide seamless functional substitution without design modification.

Manufacturer-Recommended Alternatives (Renesas Electronics):

The ICL3243 series from Renesas Electronics provides functionally equivalent RS232 transceiver solutions with enhanced performance characteristics. All ICL3243 variants maintain the critical 3/5 driver/receiver configuration, full-duplex RS232 protocol, and 3V to 5.5V supply compatibility. Key differences include higher data rate capability (250 kbps versus 120 kbps) and increased receiver hysteresis (500 mV versus 300 mV), both of which are backward compatible with legacy MAX3243EUI applications.

Temperature Range Considerations:

ICL3243ECAZ, ICL3243ECAZ-T, ICL3243ECVZ, and ICL3243ECVZ-T variants operate within a 0°C to 70°C temperature range, which is narrower than the MAX3243EUI specification of -40°C to 85°C. These parts are suitable for applications with restricted operating temperature requirements.

ICL3243EIAZ, ICL3243EIAZ-T, ICL3243EIVZ, and ICL3243EIVZ-T variants maintain the full -40°C to 85°C operating temperature range, providing direct thermal compatibility with the original MAX3243EUI specification.

Package Selection:

28-TSSOP package variants (MAX3243EEUI+, MAX3243EUI+, ICL3243ECVZ, ICL3243ECVZ-T, ICL3243EIVZ, ICL3243EIVZ-T) maintain identical footprint compatibility with the original MAX3243EUI.

28-SSOP package variants (ICL3243ECAZ, ICL3243ECAZ-T, ICL3243EIAZ, ICL3243EIAZ-T) feature a wider package body (5.30mm versus 4.40mm) and require PCB layout verification before implementation.

Compliance Status:

All substitute parts listed are ROHS3 compliant, addressing regulatory requirements for new production. The original MAX3243EUI is RoHS non-compliant and should be phased out in favor of compliant alternatives.

Frequently Asked Questions (FAQ)

Q: Can MAX3243EEUI+ or MAX3243EUI+ be used as direct replacements for MAX3243EUI?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, package type (28-TSSOP), and pin configuration. The primary differences are active product status and ROHS3 compliance. No design modifications are required.

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

A: The 28-TSSOP package has a body width of 0.173" (4.40mm), while the 28-SSOP package has a body width of 0.209" (5.30mm). The SSOP variant is wider and requires PCB layout verification to confirm footprint compatibility. Pin pitch and lead configuration differ between these package types.

Q: Are Renesas ICL3243 parts compatible with MAX3243EUI applications?

A: Yes, with parameter verification. All ICL3243 variants maintain the critical RS232 protocol, 3/5 driver/receiver configuration, full-duplex operation, and 3V to 5.5V supply range. The higher data rate (250 kbps) and increased receiver hysteresis (500 mV) are backward compatible with legacy MAX3243EUI designs. Temperature range and package type must be verified against application requirements.

Q: Which substitute part should be selected for applications requiring -40°C to 85°C operation?

A: For full temperature range compatibility, select MAX3243EEUI+, MAX3243EUI+, ICL3243EIAZ, ICL3243EIAZ-T, ICL3243EIVZ, or ICL3243EIVZ-T. Parts designated with "EC" (ICL3243ECAZ, ICL3243ECVZ) operate only to 70°C and are unsuitable for extended low-temperature applications.

Q: What is the significance of the "+" suffix in MAX3243EEUI+ and MAX3243EUI+?

A: The "+" suffix indicates ROHS3 compliance and active product status. These parts are the current production equivalents to the obsolete MAX3243EUI and are recommended for new designs and production continuity.

Q: Can ICL3243ECVZ (28-TSSOP) be substituted for MAX3243EUI without PCB modification?

A: Yes, the 28-TSSOP package maintains identical footprint compatibility. However, the operating temperature range is limited to 0°C to 70°C. Verify that your application does not require operation below 0°C or above 70°C before implementation.

Q: What packaging options are available for substitute parts?

A: Maxim Integrated equivalents (MAX3243EEUI+, MAX3243EUI+) are supplied in tube packaging. Renesas ICL3243 variants are available in tube, tape & reel (TR), or cut tape (CT) & Digi-Reel packaging options. Select packaging based on production volume and handling requirements.

Q: Is there a performance advantage to using ICL3243 parts over MAX3243 equivalents?

A: ICL3243 variants offer higher data rate capability (250 kbps versus 120 kbps) and increased receiver hysteresis (500 mV versus 300 mV). These enhancements provide improved noise immunity and higher-speed communication capability. For legacy applications operating at 120 kbps, both part families are functionally equivalent.

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