MAX3243IPW Equivalent & Substitute Parts

Part Overview

The MAX3243IPW is a 3/5 Transceiver Full RS232 interface IC in 28-TSSOP surface mount packaging, manufactured by Texas Instruments. This part is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MAX3243IPW operates across 3V to 5.5V supply voltage with full-duplex RS232 communication capability, supporting data rates up to 250kbps with 500mV receiver hysteresis.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	MAX3243IPW
Product Status	Obsolete
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	250kbps
Voltage Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX3243IPW is determined by the following critical parameters: RS232 protocol compliance, 3/5 driver/receiver configuration, full-duplex operation, 28-pin surface mount packaging (TSSOP or SSOP variants), voltage supply range of 3V to 5.5V, and data rate capability of 250kbps or higher. The receiver hysteresis specification of 500mV is a key electrical parameter for signal integrity.

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Active Status) Parts maintaining identical electrical specifications and 28-TSSOP packaging with -40°C to 85°C operating temperature range, ensuring drop-in replacement capability.

Category 2: Functional Equivalents (Active Status) Parts with compatible RS232 3/5 transceiver functionality in 28-pin packaging but with alternative package variants (28-SSOP) or modified operating temperature ranges (0°C to 70°C), requiring design verification for thermal and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Package	Data Rate	Voltage Supply	Operating Temp	Receiver Hysteresis	Product Status	MSL Rating
MAX3243IPW	Texas Instruments	28-TSSOP	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500mV	Obsolete	1
MAX3243IPWR	Texas Instruments	28-TSSOP	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500mV	Active	1
ICL3243ECVZ	Renesas Electronics	28-TSSOP	250kbps	3V ~ 5.5V	0°C ~ 70°C	500mV	Active	3
ICL3243ECVZ-T	Renesas Electronics	28-TSSOP	250kbps	3V ~ 5.5V	0°C ~ 70°C	500mV	Active	3
ICL3243EIVZ-T	Renesas Electronics	28-TSSOP	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500mV	Active	3
ICL3243ECAZ	Renesas Electronics	28-SSOP	250kbps	3V ~ 5.5V	0°C ~ 70°C	500mV	Active	2
ICL3243ECAZ-T	Renesas Electronics	28-SSOP	250kbps	3V ~ 5.5V	0°C ~ 70°C	500mV	Active	2
ICL3243EIAZ	Renesas Electronics	28-SSOP	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500mV	Active	2
ICL3243EIAZ-T	Renesas Electronics	28-SSOP	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500mV	Active	2
MAX3243CUI+	Analog Devices Inc./Maxim Integrated	28-TSSOP	120Kbps	3V ~ 5.5V	0°C ~ 70°C	300mV	Active	1
MAX3243CUI+T	Analog Devices Inc./Maxim Integrated	28-TSSOP	120Kbps	3V ~ 5.5V	0°C ~ 70°C	300mV	Active	1

Engineering Selection Recommendations

Primary Recommendation: MAX3243IPWR

The MAX3243IPWR is the direct active equivalent to the MAX3243IPW. Manufactured by Texas Instruments, it maintains identical electrical specifications including 250kbps data rate, 500mV receiver hysteresis, and -40°C to 85°C operating temperature range. The part is in Active product status with unlimited moisture sensitivity rating (MSL 1), ensuring long-term availability and supply chain stability. This part requires no design modifications and provides the highest compatibility for direct replacement applications.

Secondary Recommendation: ICL3243EIVZ-T

The ICL3243EIVZ-T, manufactured by Renesas Electronics Corporation, provides functional equivalence with identical electrical performance and 28-TSSOP packaging. It maintains the -40°C to 85°C operating temperature range and 250kbps data rate. The part is in Active status with ROHS3 compliance. The MSL 3 rating (168 hours) requires standard moisture control during storage and assembly.

Alternative for Extended Temperature Range: ICL3243EIAZ-T

For applications requiring 28-SSOP packaging instead of 28-TSSOP, the ICL3243EIAZ-T offers identical electrical specifications with -40°C to 85°C operating temperature coverage. The 28-SSOP package (0.209", 5.30mm width) differs mechanically from the original 28-TSSOP (0.173", 4.40mm width), requiring PCB layout verification. MSL 2 rating (1 year) applies.

Not Recommended: MAX3243CUI+ and MAX3243CUI+T

These parts exhibit reduced data rate (120Kbps versus 250kbps) and lower receiver hysteresis (300mV versus 500mV), making them unsuitable for applications requiring the full electrical performance of the MAX3243IPW.

Frequently Asked Questions (FAQ)

Q: Can MAX3243IPWR be used as a direct replacement for MAX3243IPW?

A: Yes. The MAX3243IPWR is the active equivalent part from Texas Instruments with identical electrical specifications, package type (28-TSSOP), and operating temperature range (-40°C to 85°C). No design changes are required.

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

A: Both are 28-pin surface mount packages but differ in physical dimensions. The 28-TSSOP has a width of 0.173" (4.40mm), while the 28-SSOP has a width of 0.209" (5.30mm). PCB footprints are not interchangeable; layout verification is required when switching between these package types.

Q: Are Renesas ICL3243 parts compatible with the MAX3243IPW?

A: Renesas ICL3243 parts maintain RS232 3/5 transceiver functionality with identical data rates (250kbps) and voltage supply ranges (3V to 5.5V). Parts with -40°C to 85°C operating temperature (ICL3243EIVZ-T, ICL3243EIAZ, ICL3243EIAZ-T) provide full electrical compatibility. Parts with 0°C to 70°C operating temperature require thermal environment verification. Package variants (TSSOP versus SSOP) require PCB layout confirmation.

Q: What does MSL rating mean for component selection?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 2 (1 Year) and MSL 3 (168 Hours) require controlled storage environments and baking procedures before assembly. The MAX3243IPW has MSL 1; substitute parts with higher MSL ratings require additional moisture management during manufacturing.

Q: Why is the MAX3243IPW classified as Obsolete?

A: Obsolete status indicates Texas Instruments has discontinued this specific part number. The MAX3243IPWR is the active replacement, maintaining full compatibility while ensuring continued availability and manufacturing support.

Q: Can MAX3243CUI+ be used instead of MAX3243IPW?

A: No. The MAX3243CUI+ operates at reduced data rate (120Kbps versus 250kbps) and lower receiver hysteresis (300mV versus 500mV). These electrical differences make it unsuitable for applications requiring the full performance specifications of the MAX3243IPW.

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