MAX3243EEAI RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3243EEAI 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-SSOP surface mount package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The device operates across 3V to 5.5V supply ranges with a 250 kbps data rate and is suitable for legacy embedded systems and industrial communication applications requiring RS232 protocol compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3243EEAI
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Category	Interface Transceiver
Protocol	RS232
Driver/Receiver Configuration	3/5 (3 Drivers, 5 Receivers)
Duplex Mode	Full
Data Rate	250 kbps
Supply Voltage Range	3V to 5.5V
Operating Temperature Range	-40°C to 85°C
Package Type	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	500 mV
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	RoHS Non-Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3243EEAI is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232
Driver/Receiver Configuration: 3/5
Duplex Mode: Full
Package Type: 28-SSOP
Supply Voltage Range: 3V to 5.5V
Operating Temperature Range: -40°C to 85°C
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Data Rate: 250 kbps or higher
Receiver Hysteresis: 500 mV (acceptable tolerance)
Moisture Sensitivity Level: 1 or 2

Substitute parts are classified into two categories:

Parametric Equivalents (Maxim Integrated MAX series): Parts with identical electrical specifications and 28-SSOP packaging, differing primarily in product status (Active vs. Obsolete) and RoHS compliance. These include MAX3241EEAI+, MAX3243EEAI+, MAX3244EAI+, MAX3244EEAI+, and MAX3250EAI+.

Direct Manufacturer Alternatives (Renesas, Texas Instruments, MaxLinear): Parts from alternative manufacturers meeting the same functional requirements and package specifications. These include ICL3245EIAZ, ICL3245EIAZ-T, MAX3243EIDB, SP3243EBEA-L/TR, and TRSF3243IDB.

Parameter Comparison

Part Number	Manufacturer	Driver/Receiver	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status	Receiver Hysteresis
MAX3243EEAI	Analog Devices/Maxim	3/5	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Obsolete	Non-Compliant	500 mV
MAX3241EEAI+	Analog Devices/Maxim	3/5	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
MAX3243EEAI+	Analog Devices/Maxim	3/5	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
MAX3244EAI+	Analog Devices/Maxim	3/5	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
MAX3244EEAI+	Analog Devices/Maxim	3/5	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
MAX3250EAI+	Analog Devices/Maxim	2/2	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
ICL3245EIAZ	Renesas Electronics	3/5	1 Mbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
ICL3245EIAZ-T	Renesas Electronics	3/5	1 Mbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	ROHS3 Compliant	500 mV
MAX3243EIDB	Texas Instruments	3/5	500 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Obsolete	ROHS3 Compliant	500 mV
SP3243EBEA-L/TR	MaxLinear, Inc.	3/5	250 kbps	3V–5.5V	-40°C to 85°C	28-SSOP	Active	RoHS Compliant	300 mV
TRSF3243IDB	Texas Instruments	3/5	1 Mbps	3V–5.5V	-40°C to 85°C	28-SSOP	Last Time Buy	ROHS3 Compliant	500 mV

Engineering Selection Recommendations

Preferred Substitutes (Active Product Status with RoHS3 Compliance):

For new designs and long-term procurement, MAX3241EEAI+, MAX3243EEAI+, MAX3244EAI+, and MAX3244EEAI+ from Analog Devices/Maxim Integrated are the primary recommendations. These parts maintain identical electrical specifications to the MAX3243EEAI while offering active product status and ROHS3 compliance, ensuring supply chain continuity and regulatory alignment.

Alternative Manufacturer Options:

ICL3245EIAZ and ICL3245EIAZ-T from Renesas Electronics provide enhanced data rate capability (1 Mbps vs. 250 kbps) with identical driver/receiver configuration and package specifications. These parts are suitable for applications requiring higher communication speeds while maintaining backward compatibility with existing PCB layouts.

SP3243EBEA-L/TR from MaxLinear, Inc. offers active product status and RoHS compliance with identical data rate and configuration. The reduced receiver hysteresis (300 mV vs. 500 mV) may provide improved noise margin in certain applications.

Conditional Substitutes:

MAX3250EAI+ is suitable only for applications requiring 2/2 driver/receiver configuration and can be used if system design permits reduced driver/receiver count.

MAX3243EIDB and TRSF3243IDB from Texas Instruments are classified as obsolete or last-time-buy, limiting their suitability for new procurement despite RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can MAX3250EAI+ directly replace MAX3243EEAI?

A: No. MAX3250EAI+ has a 2/2 driver/receiver configuration compared to the 3/5 configuration of MAX3243EEAI. Direct substitution is only possible if the application design accommodates reduced driver and receiver channels.

Q: What is the primary advantage of ICL3245EIAZ over MAX3243EEAI?

A: ICL3245EIAZ supports 1 Mbps data rate compared to 250 kbps for MAX3243EEAI, providing four times higher communication speed. All other electrical and package parameters remain compatible.

Q: Are MAX3241EEAI+ and MAX3243EEAI+ interchangeable?

A: Yes. Both parts share identical electrical specifications, 28-SSOP packaging, 3/5 driver/receiver configuration, and operating parameters. The primary difference is the base product number (MAX3241 vs. MAX3243), which does not affect functional compatibility.

Q: Why is SP3243EBEA-L/TR listed as a substitute despite different receiver hysteresis?

A: SP3243EBEA-L/TR maintains all critical parameters: 3/5 configuration, 28-SSOP package, 3V–5.5V supply, and -40°C to 85°C operating range. The 300 mV receiver hysteresis (vs. 500 mV) is within acceptable tolerance for RS232 interface applications and may provide improved sensitivity in low-noise environments.

Q: What packaging difference exists between ICL3245EIAZ and ICL3245EIAZ-T?

A: ICL3245EIAZ is supplied in Tube packaging, while ICL3245EIAZ-T is supplied in Tape & Reel (TR) format. Both parts are electrically identical; packaging selection depends on assembly process requirements and volume.

Q: Is RoHS compliance mandatory for substitution?

A: RoHS compliance is not a functional requirement for substitution but is a regulatory and procurement consideration. MAX3243EEAI is RoHS non-compliant, while most active substitutes are ROHS3 compliant, making them preferable for new designs subject to environmental regulations.

Q: Can TRSF3243IDB be used for new production?

A: TRSF3243IDB is classified as Last Time Buy, indicating limited remaining inventory and no future production. It is not recommended for new designs; active alternatives such as ICL3245EIAZ or MAX3244EEAI+ should be selected instead.

Q: What is the significance of the "+" suffix in part numbers like MAX3243EEAI+?

A: The "+" suffix typically indicates an updated or revised version of the base part number, often with improved specifications or compliance status. MAX3243EEAI+ is the active, RoHS-compliant variant of the obsolete MAX3243EEAI.

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