MAX3243MDBREP RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3243MDBREP is an active RS232 transceiver interface circuit manufactured by Texas Instruments. This device functions as a full-duplex 3/5 transceiver, providing bidirectional communication between RS232 and TTL/CMOS logic levels. The part is classified as Active with ROHS3 compliance and operates across industrial temperature ranges. Substitute parts are necessary to address supply chain availability, packaging preferences, temperature range requirements, or alternative manufacturer sourcing while maintaining functional equivalence in RS232 interface applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3243MDBREP
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	250 kbps
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Package/Case	28-SSOP (0.209", 5.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Part Status	Active

Substitute Part Grouping Explanation

Substitution of the MAX3243MDBREP is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Operating Temperature Range: Substitute parts with narrower or equivalent temperature ranges are acceptable for applications not requiring the full -55°C ~ 125°C range
Receiver Hysteresis: Variations between 300 mV and 500 mV are acceptable within RS232 specification tolerances
Data Rate: Substitute parts with equal or higher data rate capability are acceptable
Package/Case: Both 28-SSOP and 28-TSSOP packages are mechanically compatible for surface mount applications with different footprint widths
Packaging Format: Tube, Cut Tape (CT), and Tape & Reel (TR) formats are interchangeable based on assembly requirements
Moisture Sensitivity Level: Variations are acceptable based on storage and handling conditions

Substitute parts are grouped by manufacturer (Renesas Electronics Corporation ICL3243 series and Analog Devices Inc./Maxim Integrated MAX3243 variants) and by package type (28-SSOP or 28-TSSOP).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Voltage Supply	Operating Temp	Package	Packaging Format	Receiver Hysteresis
MAX3243MDBREP	Texas Instruments	RS232	3/5	250 kbps	3V ~ 5.5V	-55°C ~ 125°C	28-SSOP	Cut Tape (CT) & Digi-Reel®	500 mV
ICL3243ECAZ-T	Renesas Electronics	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tape & Reel (TR)	500 mV
ICL3243ECVZ-T	Renesas Electronics	RS232	3/5	250 kbps	3V ~ 5.5V	0°C ~ 70°C	28-TSSOP	Cut Tape (CT) & Digi-Reel®	500 mV
ICL3243EIAZ	Renesas Electronics	RS232	3/5	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Tube	500 mV
ICL3243EIAZ-T	Renesas Electronics	RS232	3/5	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Cut Tape (CT) & Digi-Reel®	500 mV
ICL3243EIVZ	Renesas Electronics	RS232	3/5	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Tube	500 mV
ICL3243EIVZ-T	Renesas Electronics	RS232	3/5	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-TSSOP	Cut Tape (CT) & Digi-Reel®	500 mV
MAX3243CAI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	120 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Tube	300 mV
MAX3243CAI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	120 kbps	3V ~ 5.5V	0°C ~ 70°C	28-SSOP	Cut Tape (CT) & Digi-Reel®	300 mV
MAX3243EAI+	Analog Devices Inc./Maxim Integrated	RS232	3/5	120 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Tube	300 mV
MAX3243EAI+T	Analog Devices Inc./Maxim Integrated	RS232	3/5	120 kbps	3V ~ 5.5V	-40°C ~ 85°C	28-SSOP	Cut Tape (CT) & Digi-Reel®	300 mV

Engineering Selection Recommendations

Renesas Electronics ICL3243 Series (Preferred for Extended Temperature Range):

The ICL3243EIAZ-T and ICL3243EIVZ-T variants provide operating temperature ranges of -40°C ~ 85°C, which approach the original MAX3243MDBREP specification of -55°C ~ 125°C. These parts maintain 250 kbps data rate and 500 mV receiver hysteresis. The ICL3243EIAZ-T is available in 28-SSOP package with Cut Tape & Digi-Reel® packaging, matching the original part's footprint and format. The ICL3243EIVZ-T offers the same temperature range in 28-TSSOP package for applications where reduced package width is acceptable.

For applications limited to 0°C ~ 70°C operating temperature, ICL3243ECAZ-T (28-SSOP, Tape & Reel) and ICL3243ECVZ-T (28-TSSOP, Cut Tape & Digi-Reel®) are available with full 250 kbps data rate capability.

Analog Devices Inc./Maxim Integrated MAX3243 Variants (Alternative Sourcing):

MAX3243EAI+T provides -40°C ~ 85°C operating temperature in 28-SSOP package with Cut Tape & Digi-Reel® packaging. This variant operates at 120 kbps data rate with 300 mV receiver hysteresis. Applications requiring the full 250 kbps data rate of the original part should not use these variants. MAX3243CAI+T is limited to 0°C ~ 70°C operating temperature and 120 kbps data rate.

Package Considerations:

28-SSOP (0.209", 5.30mm width) packages are direct footprint replacements. 28-TSSOP (0.173", 4.40mm width) packages require PCB layout modification but provide reduced board space. Both package types are surface mount compatible.

Compliance and Status:

All substitute parts maintain ROHS3 compliance and Active product status. Moisture sensitivity levels vary from 1 (Unlimited) to 3 (168 Hours), requiring appropriate storage and handling protocols during assembly.

Frequently Asked Questions (FAQ)

Q: Can ICL3243ECVZ-T replace MAX3243MDBREP in all applications?

A: ICL3243ECVZ-T is functionally equivalent for RS232 transceiver applications within its operating temperature range of 0°C ~ 70°C. The original part operates to -55°C ~ 125°C. If your application requires operation below 0°C or above 70°C, use ICL3243EIAZ-T or ICL3243EIVZ-T instead. The 28-TSSOP package requires PCB layout modification compared to the original 28-SSOP footprint.

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

A: Both are 28-pin surface mount packages. The 28-SSOP has a width of 0.209" (5.30mm), while the 28-TSSOP has a width of 0.173" (4.40mm). The TSSOP package is narrower and requires different PCB pad layouts. Pin pitch and functionality remain identical. Select based on available PCB space and existing layout constraints.

Q: Are MAX3243CAI+T and MAX3243EAI+T suitable replacements?

A: These parts are functionally equivalent for RS232 transceiver applications but operate at 120 kbps data rate compared to the original 250 kbps. Use these variants only if your application data rate requirement is 120 kbps or lower. MAX3243EAI+T supports -40°C ~ 85°C operating temperature; MAX3243CAI+T is limited to 0°C ~ 70°C.

Q: What does receiver hysteresis variation mean for substitution?

A: The original MAX3243MDBREP has 500 mV receiver hysteresis. Substitute parts with 300 mV hysteresis (MAX3243 variants) provide tighter input threshold control. Both values comply with RS232 specifications. The 300 mV hysteresis may improve noise immunity in some applications but does not affect functional compatibility.

Q: Can I use Tube packaging instead of Cut Tape & Digi-Reel® format?

A: Tube and Cut Tape & Digi-Reel® are different packaging formats for the same component. Tube packaging is suitable for manual assembly or small-volume production. Cut Tape & Digi-Reel® format is optimized for automated pick-and-place assembly. The electrical and mechanical specifications are identical; selection depends on assembly process requirements.

Q: Which substitute part has the closest temperature range match to MAX3243MDBREP?

A: ICL3243EIAZ-T and ICL3243EIVZ-T provide -40°C ~ 85°C operating range, which is the closest available match to the original -55°C ~ 125°C specification. These parts do not extend to -55°C or 125°C. For applications requiring the full original temperature range, alternative sourcing or design modification may be necessary.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the original MAX3243MDBREP. All parts are also REACH Unaffected and classified under ECCN EAR99.

Q: What is Moisture Sensitivity Level (MSL) and why does it vary?

A: MSL indicates the maximum time a component can be stored in ambient conditions before requiring baking prior to reflow soldering. MSL 1 (Unlimited) requires no time restrictions. MSL 2 (1 Year) and MSL 3 (168 Hours) require adherence to storage time limits. Select based on your inventory management and assembly scheduling practices.

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