MAX3243CUI RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3243CUI is a full-duplex RS232 transceiver 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 equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across a 3V to 5.5V supply range with a 120 kbps data rate and is suitable for legacy RS232 communication applications requiring compact packaging.

Key Parameters

Parameter	MAX3243CUI
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
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
Package	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX3243CUI is determined by strict equivalence across the following critical parameters:

Protocol: RS232 full-duplex transceiver
Driver/Receiver Configuration: 3 drivers and 5 receivers
Supply Voltage Range: 3V to 5.5V
Package Type: 28-TSSOP or 28-SSOP (mechanically compatible)
Mounting: Surface mount
Operating Temperature Range: Minimum 0°C to 70°C (extended range variants acceptable)

Substitute parts are grouped into three categories:

Parametric Equivalents (MAX3243CUI+, MAX3243ECUI+): Identical electrical specifications with active product status and improved RoHS compliance
Direct Manufacturer Alternatives (MAX3243CPW): Same base functionality with minor parameter variations (higher hysteresis and data rate)
Manufacturer Recommended Alternatives (ICL3243 series): Renesas Electronics equivalents with compatible pinout and electrical characteristics, available in multiple package and temperature variants

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Receiver Hysteresis	Voltage Supply	Operating Temp	Package	Product Status	RoHS Status
MAX3243CUI	Analog Devices	3/5	120 kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Obsolete	RoHS non-compliant
MAX3243CUI+	Analog Devices	3/5	120 kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active	ROHS3 Compliant
MAX3243ECUI+	Analog Devices	3/5	120 kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active	ROHS3 Compliant
MAX3243CPW	Texas Instruments	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Obsolete	ROHS3 Compliant
ICL3243ECAZ	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
ICL3243ECAZ-T	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Active	ROHS3 Compliant
ICL3243ECVZ	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active	ROHS3 Compliant
ICL3243ECVZ-T	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Active	ROHS3 Compliant
ICL3243EIAZ	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant
ICL3243EIAZ-T	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Active	ROHS3 Compliant
ICL3243EIVZ	Renesas Electronics	3/5	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MAX3243CUI+ or MAX3243ECUI+

These Analog Devices parts provide direct electrical equivalence to the MAX3243CUI with active product status and ROHS3 compliance. Selection between these two variants depends on packaging requirements (tube vs. tape & reel) and inventory availability. Both maintain the original 300 mV receiver hysteresis and 120 kbps data rate specifications.

Secondary Recommendation: ICL3243ECVZ or ICL3243ECVZ-T (Renesas Electronics)

These Renesas alternatives offer active product status, ROHS3 compliance, and 28-TSSOP package compatibility with the original MAX3243CUI. The increased receiver hysteresis (500 mV) and data rate (250 kbps) provide enhanced noise immunity and performance headroom. Packaging options include tube (ECVZ) and cut tape with Digi-Reel (ECVZ-T).

Extended Temperature Range Option: ICL3243EIAZ, ICL3243EIAZ-T, or ICL3243EIVZ

For applications requiring extended operating temperature range (-40°C to 85°C), Renesas Electronics offers the ICL3243EI series. The EIAZ and EIAZ-T variants use 28-SSOP packaging, while EIVZ uses 28-TSSOP. All maintain full RS232 3/5 transceiver functionality with active product status and ROHS3 compliance.

Compliance Consideration

The original MAX3243CUI is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting modern procurement and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can MAX3243CUI+ directly replace MAX3243CUI without circuit modification?

A: Yes. MAX3243CUI+ is a parametric equivalent with identical electrical specifications (3/5 drivers/receivers, 300 mV hysteresis, 120 kbps data rate, 3V-5.5V supply). The primary difference is active product status and ROHS3 compliance. Pinout and package (28-TSSOP) are identical.

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

A: Both are surface mount packages with 28 pins. The 28-TSSOP has a width of 0.173" (4.40mm), while 28-SSOP has a width of 0.209" (5.30mm). PCB footprints differ; verify layout compatibility before substitution. Pin assignments remain consistent across both package types for this device family.

Q: Are ICL3243 parts from Renesas fully compatible with MAX3243CUI?

A: ICL3243 parts maintain the same RS232 3/5 transceiver configuration, supply voltage range (3V-5.5V), and pin assignments. However, receiver hysteresis is higher (500 mV vs. 300 mV) and data rate is faster (250 kbps vs. 120 kbps). These differences represent performance improvements and do not prevent functional substitution in legacy applications. Package selection (28-TSSOP vs. 28-SSOP) must match PCB design.

Q: Which substitute part has the best availability?

A: ICL3243EIAZ-T and ICL3243ECVZ-T show the highest inventory levels (20,200 and 7,514 units respectively). MAX3243CUI+ also has substantial availability (25,200 units). Selection should balance availability with specific package and temperature range requirements.

Q: Can I use ICL3243EIAZ for applications requiring only 0°C to 70°C operation?

A: Yes. ICL3243EIAZ is rated for -40°C to 85°C, which exceeds the 0°C to 70°C requirement of the original MAX3243CUI. The extended temperature range does not create incompatibility; it provides additional operational margin. Verify MSL (Moisture Sensitivity Level) requirements for your assembly process: ICL3243EIAZ has MSL 2 (1 Year) versus MAX3243CUI's MSL 1 (Unlimited).

Q: What is the significance of the "+" suffix in MAX3243CUI+ and MAX3243ECUI+?

A: The "+" suffix indicates an updated version with improved compliance status (ROHS3 compliant) and active product lifecycle status. Electrical and mechanical specifications remain identical to the base part number. This is a direct replacement with no design changes required.

Q: Are there packaging format differences I should consider?

A: Yes. Tube packaging (standard) is suitable for manual assembly and small-volume production. Tape & Reel (TR) and Cut Tape with Digi-Reel (CT) formats are optimized for automated pick-and-place assembly. Select based on your manufacturing process. All formats contain identical components; packaging affects only handling and assembly efficiency.

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