MAX3243CPW Equivalent & Substitute Parts

Part Overview

The MAX3243CPW is a full RS232 transceiver IC with 3 drivers and 5 receivers, manufactured by Texas Instruments in a 28-TSSOP surface mount package. This component is classified as obsolete, though 2,118 units remain in stock. The part operates across a 3V to 5.5V supply range with a 250kbps data rate and 500mV receiver hysteresis, suitable for legacy RS232 communication applications requiring full-duplex operation.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, system maintenance, and long-term component availability. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	MAX3243CPW Value
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	250kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	28-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX3243CPW is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Voltage Supply Range: 3V ~ 5.5V
Package Type: 28-TSSOP or 28-SSOP (mechanically compatible)
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Allowable Parameter Variations:

Receiver Hysteresis: 300mV or 500mV (both acceptable for RS232 applications)
Data Rate: 120kbps, 250kbps, or 1Mbps (higher rates maintain backward compatibility)
Operating Temperature: 0°C ~ 70°C or -40°C ~ 85°C (extended range acceptable)
Product Status: Active preferred over Obsolete for long-term availability
Packaging Format: Tube, Cut Tape, or Tape & Reel (all suitable for assembly)

Substitutes are grouped into three categories: Direct Manufacturer Equivalents (same base part number, different packaging), Parametric Equivalents (identical electrical specifications, different manufacturer), and Upgrades (enhanced specifications with extended temperature range or higher data rates).

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Receiver Hysteresis	Operating Temp	Package	Product Status	Inventory
MAX3243CPW	Texas Instruments	3/5	250kbps	500mV	0°C ~ 70°C	28-TSSOP	Obsolete	2,118
MAX3243CPWR	Texas Instruments	3/5	250kbps	500mV	0°C ~ 70°C	28-TSSOP	Active	45,100
TRS3243CPW	Texas Instruments	3/5	250kbps	500mV	0°C ~ 70°C	28-TSSOP	Obsolete	1,597
MAX3243ECUI+	Analog Devices Inc./Maxim Integrated	3/5	120kbps	300mV	0°C ~ 70°C	28-TSSOP	Active	2,100
MAX3243ECUI+T	Analog Devices Inc./Maxim Integrated	3/5	120kbps	300mV	0°C ~ 70°C	28-TSSOP	Active	3,700
MAX3245ECUI+	Analog Devices Inc./Maxim Integrated	3/5	1Mbps	500mV	0°C ~ 70°C	28-TSSOP	Active	5,200
MAX3243EEUI+	Analog Devices Inc./Maxim Integrated	3/5	120kbps	300mV	-40°C ~ 85°C	28-TSSOP	Active	1,900
MAX3243EEUI+T	Analog Devices Inc./Maxim Integrated	3/5	120kbps	300mV	-40°C ~ 85°C	28-TSSOP	Active	2,300
SP3243EEY-L	MaxLinear, Inc.	3/5	120kbps	300mV	-40°C ~ 85°C	28-TSSOP	Active	1,490
SP3243EEY-L/TR	MaxLinear, Inc.	3/5	120kbps	300mV	-40°C ~ 85°C	28-TSSOP	Active	3,558
ICL3243ECAZ	Renesas Electronics Corporation	3/5	250kbps	500mV	0°C ~ 70°C	28-SSOP	Active	2,716

Engineering Selection Recommendations

Primary Recommendation: MAX3243CPWR

The MAX3243CPWR is the direct active equivalent of the MAX3243CPW, manufactured by Texas Instruments with identical electrical specifications and 28-TSSOP packaging. This part maintains 500mV receiver hysteresis and 250kbps data rate, ensuring seamless integration into existing designs. With 45,100 units in stock and active product status, this represents the optimal choice for immediate replacement and long-term supply continuity. Both parts are ROHS3 compliant with MSL 1 rating.

Secondary Recommendation: ICL3243ECAZ

The ICL3243ECAZ, manufactured by Renesas Electronics Corporation, provides identical electrical performance with 250kbps data rate and 500mV receiver hysteresis. The package differs slightly (28-SSOP vs. 28-TSSOP), but both are mechanically compatible surface mount packages with equivalent pin spacing. This part is active with 2,716 units available and maintains ROHS3 compliance. Selection of this part requires verification of PCB footprint compatibility.

Alternative Recommendation: MAX3245ECUI+

The MAX3245ECUI+ offers enhanced performance with 1Mbps data rate while maintaining identical 3/5 driver/receiver configuration and 500mV hysteresis. This upgrade is suitable for applications requiring higher data throughput without design modification. The part is active with 5,200 units in stock and operates within the same 3V to 5.5V supply range.

Extended Temperature Recommendation: MAX3243EEUI+ or SP3243EEY-L/TR

For applications requiring extended operating temperature range (-40°C to 85°C), the MAX3243EEUI+ (Analog Devices Inc./Maxim Integrated) or SP3243EEY-L/TR (MaxLinear, Inc.) provide identical 3/5 configuration with active product status. Both parts feature 300mV receiver hysteresis and 120kbps data rate, suitable for industrial and automotive environments. The SP3243EEY-L/TR offers superior inventory availability with 3,558 units.

Frequently Asked Questions (FAQ)

Q: Can MAX3243ECUI+ directly replace MAX3243CPW in existing designs?

A: The MAX3243ECUI+ maintains the critical 3/5 driver/receiver configuration, RS232 protocol, full-duplex operation, and 28-TSSOP package. However, it operates at 120kbps data rate versus the original 250kbps, and features 300mV receiver hysteresis instead of 500mV. This part is suitable for applications not requiring the higher data rate or tighter hysteresis specification of the original design.

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

A: Both are surface mount packages with 28 pins. The 28-TSSOP measures 0.173" width (4.40mm), while the 28-SSOP measures 0.209" width (5.30mm). Pin pitch and spacing differ slightly. PCB footprint verification is required before substituting ICL3243ECAZ (28-SSOP) for MAX3243CPW (28-TSSOP).

Q: Is MAX3243CPWR a direct replacement for MAX3243CPW?

A: Yes. MAX3243CPWR is the active production equivalent with identical electrical specifications, 28-TSSOP package, and ROHS3 compliance. The only difference is product status (Active vs. Obsolete) and packaging format availability. This is the recommended replacement.

Q: Can I use MAX3245ECUI+ as a substitute?

A: Yes, with design verification. The MAX3245ECUI+ maintains the 3/5 configuration and 28-TSSOP package but operates at 1Mbps data rate (versus 250kbps) with 500mV hysteresis. The higher data rate is backward compatible with lower-speed applications. No design changes are required.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life without moisture bake-out requirements. Both the original MAX3243CPW and all recommended substitutes carry MSL 1 rating, eliminating moisture-related handling constraints during assembly and storage.

Q: Are all substitutes ROHS3 compliant?

A: All recommended substitutes maintain ROHS3 compliance. The MAX3243CPWR, MAX3245ECUI+, MAX3243EEUI+, and MAX3243EEUI+T are ROHS3 compliant. The SP3243EEY-L and SP3243EEY-L/TR are RoHS Compliant (equivalent standard). The ICL3243ECAZ is ROHS3 compliant. All parts are suitable for RoHS-regulated applications.

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

A: MAX3243CPWR provides the highest inventory (45,100 units) with active product status from the original manufacturer, Texas Instruments. This ensures sustained availability for future procurement and design revisions.

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