MAX3243ECPW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3243ECPW is a 3/5 transceiver IC for full-duplex RS232 communication, manufactured by Texas Instruments in a 28-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a 3V to 5.5V supply range with a 500 kbps data rate and 500 mV receiver hysteresis, suitable for legacy serial communication applications requiring full RS232 protocol compliance.

Key Parameters

Parameter	Value
Part Number	MAX3243ECPW
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	500 kbps
Supply Voltage	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-TSSOP (0.173", 4.40mm Width)
Receiver Hysteresis	500 mV
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX3243ECPW is determined by strict equivalence across the following critical parameters:

Protocol: RS232 full-duplex transceiver
Configuration: 3 drivers / 5 receivers
Package: 28-TSSOP form factor
Supply voltage range: 3V ~ 5.5V
Mounting type: Surface mount

Substitute parts are categorized as follows:

Direct Equivalents maintain identical electrical specifications including data rate (500 kbps) and receiver hysteresis (500 mV). These parts are pin-compatible and functionally interchangeable without design modification.

Parametric Equivalents meet the core functional requirements but may differ in secondary parameters such as data rate (250 kbps) or receiver hysteresis (300 mV). These remain compatible within RS232 protocol constraints.

Upgrade Options extend the operating temperature range from 0°C ~ 70°C to -40°C ~ 85°C, providing enhanced environmental performance while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Data Rate	Receiver Hysteresis	Operating Temperature	Packaging	Inventory
MAX3243ECPW	Texas Instruments	Obsolete	500 kbps	500 mV	0°C ~ 70°C	Tube	2200 Pcs
MAX3243ECPWR	Texas Instruments	Active	500 kbps	500 mV	0°C ~ 70°C	Cut Tape & Digi-Reel	27600 Pcs
TRS3243ECPW	Texas Instruments	Last Time Buy	500 kbps	500 mV	0°C ~ 70°C	Tube	1369 Pcs
ICL3243ECVZ	Renesas Electronics	Active	250 kbps	500 mV	0°C ~ 70°C	Tube	1859 Pcs
ICL3243ECVZ-T	Renesas Electronics	Active	250 kbps	500 mV	0°C ~ 70°C	Cut Tape & Digi-Reel	7514 Pcs
ICL3243EIVZ	Renesas Electronics	Active	250 kbps	500 mV	-40°C ~ 85°C	Tube	9919 Pcs
ICL3243EIVZ-T	Renesas Electronics	Active	250 kbps	500 mV	-40°C ~ 85°C	Cut Tape & Digi-Reel	1464 Pcs
SP3243EBEY-L	MaxLinear, Inc.	Active	250 kbps	300 mV	-40°C ~ 85°C	Tube	1200 Pcs
SP3243EBEY-L/TR	MaxLinear, Inc.	Active	250 kbps	300 mV	-40°C ~ 85°C	Tape & Reel	17557 Pcs
SP3243EEY-L	MaxLinear, Inc.	Active	120 kbps	300 mV	-40°C ~ 85°C	Not Specified	1490 Pcs
SP3243EEY-L/TR	MaxLinear, Inc.	Active	120 kbps	300 mV	-40°C ~ 85°C	Tape & Reel	3558 Pcs

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

MAX3243ECPWR is the primary direct equivalent, offering identical electrical specifications with active product status and significantly higher inventory availability (27600 Pcs). This part is available in Cut Tape and Digi-Reel packaging, suitable for both prototype and production volumes.

For Extended Temperature Range Applications:

ICL3243EIVZ and ICL3243EIVZ-T (Renesas Electronics) extend the operating temperature range to -40°C ~ 85°C while maintaining 500 mV receiver hysteresis. These parts are active products with robust inventory levels. The -T variant provides Tape & Reel packaging for automated assembly.

SP3243EBEY-L/TR (MaxLinear, Inc.) offers the highest inventory availability (17557 Pcs) among extended-temperature options with Tape & Reel packaging. Note the reduced receiver hysteresis of 300 mV and data rate of 250 kbps.

For Cost-Optimized Designs:

ICL3243ECVZ-T provides active product status with extended packaging options and lower cost positioning, though data rate is reduced to 250 kbps.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. MSL ratings vary between 1 (Unlimited) and 3 (168 Hours), with implications for storage and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can MAX3243ECPWR be used as a direct replacement for MAX3243ECPW?

A: Yes. MAX3243ECPWR is electrically and functionally identical, with the same 500 kbps data rate, 500 mV receiver hysteresis, and 0°C ~ 70°C operating range. The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tube) and higher inventory availability.

Q: What is the impact of reduced data rate in Renesas and MaxLinear alternatives?

A: The ICL3243 and SP3243 series operate at 250 kbps or lower. For applications requiring 500 kbps operation, these parts are not suitable. For legacy RS232 systems typically operating at 115.2 kbps or lower, the reduced data rate has no functional impact.

Q: Are the SP3243 parts with 300 mV receiver hysteresis compatible?

A: SP3243 parts maintain RS232 protocol compliance with 300 mV hysteresis. This reduced hysteresis may improve noise immunity in some applications but does not affect pin compatibility or basic functionality. Verify signal integrity in your specific application environment.

Q: Which substitute offers the best long-term availability?

A: MAX3243ECPWR (Texas Instruments, Active status, 27600 Pcs) and SP3243EBEY-L/TR (MaxLinear, 17557 Pcs) offer the highest inventory levels and active product status, ensuring sustained supply for production requirements.

Q: What are the MSL implications for storage?

A: MAX3243ECPW and MAX3243ECPWR carry MSL 1 (Unlimited), requiring no special moisture control. ICL3243 and SP3243 parts carry MSL 3 (168 Hours), requiring bake-out procedures if storage exceeds 168 hours in standard humidity conditions.

Q: Can I use extended-temperature parts in standard 0°C ~ 70°C applications?

A: Yes. Extended-temperature parts (ICL3243EIVZ, SP3243EBEY-L/TR) are fully compatible in standard temperature ranges and provide additional margin for thermal stress conditions. No design changes are required.

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