MAX3243CPWRG4 Equivalent & Substitute Parts

Part Overview

The MAX3243CPWRG4 is a full-duplex RS232 transceiver IC manufactured by Texas Instruments, featuring 3 drivers and 5 receivers in a 28-TSSOP surface mount package. This device operates across a 3V to 5.5V supply voltage range and supports data rates up to 250 kbps with a 500 mV receiver hysteresis specification. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements.

Key Parameters

Parameter	Specification
Part Number	MAX3243CPWRG4
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	250 kbps
Receiver Hysteresis	500 mV
Supply Voltage	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3243CPWRG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

RS232 protocol implementation
3 drivers and 5 receivers configuration
Full-duplex operation
28-pin package format (TSSOP or SSOP variants)
Supply voltage range: 3V ~ 5.5V
Surface mount technology

Secondary Compatibility Criteria:

Data rate capability (minimum 250 kbps)
Receiver hysteresis (500 mV preferred)
Operating temperature range (0°C ~ 70°C minimum)
RoHS3 compliance
MSL rating compatibility

Substitutes are grouped into three categories based on functional equivalence and parameter alignment:

Category 1: Direct Packaging Equivalents (28-TSSOP) Parts maintaining identical package geometry and electrical specifications, suitable for direct PCB replacement without layout modification.

Category 2: Package Variant Equivalents (28-SSOP) Parts with functionally equivalent specifications but different package footprint (28-SSOP vs 28-TSSOP), requiring PCB layout evaluation.

Category 3: Enhanced Performance Variants Parts with superior data rate or extended temperature range capabilities, providing upgrade paths for demanding applications.

Parameter Comparison

Part Number	Manufacturer	Package	Drivers/Receivers	Data Rate	Receiver Hysteresis	Operating Temp	Supply Voltage	Product Status
MAX3243CPWRG4	Texas Instruments	28-TSSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	3V ~ 5.5V	Discontinued
MAX3243CPWR	Texas Instruments	28-TSSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	3V ~ 5.5V	Active
MAX3243ECUI+	Analog Devices Inc./Maxim Integrated	28-TSSOP	3/5	120 kbps	300 mV	0°C ~ 70°C	3V ~ 5.5V	Active
MAX3244ECUI+	Analog Devices Inc./Maxim Integrated	28-TSSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	3V ~ 5.5V	Active
MAX3245ECUI+	Analog Devices Inc./Maxim Integrated	28-TSSOP	3/5	1 Mbps	500 mV	0°C ~ 70°C	3V ~ 5.5V	Active
MAX3243EEUI+	Analog Devices Inc./Maxim Integrated	28-TSSOP	3/5	120 kbps	300 mV	-40°C ~ 85°C	3V ~ 5.5V	Active
ICL3243ECAZ	Renesas Electronics Corporation	28-SSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	3V ~ 5.5V	Active
ICL3243ECAZ-T	Renesas Electronics Corporation	28-SSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	3V ~ 5.5V	Active
ICL3243EIAZ	Renesas Electronics Corporation	28-SSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	3V ~ 5.5V	Active
ICL3243EIAZ-T	Renesas Electronics Corporation	28-SSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	3V ~ 5.5V	Active
ICL3243EIVZ	Renesas Electronics Corporation	28-TSSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	3V ~ 5.5V	Active

Engineering Selection Recommendations

Primary Recommendation: MAX3243CPWR

The MAX3243CPWR represents the optimal direct substitute for the discontinued MAX3243CPWRG4. Both parts are manufactured by Texas Instruments, share identical electrical specifications (250 kbps data rate, 500 mV receiver hysteresis), and utilize the same 28-TSSOP package geometry. The MAX3243CPWR maintains active product status with substantial inventory availability (45,100 units), ensuring long-term procurement viability. This part requires no PCB layout modifications and provides drop-in compatibility for existing designs.

Secondary Recommendation: ICL3243EIVZ

The ICL3243EIVZ, manufactured by Renesas Electronics Corporation, offers full electrical equivalence to the original part while providing extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). This part maintains the 28-TSSOP package format, 250 kbps data rate, and 500 mV receiver hysteresis. Selection of this part is appropriate for applications requiring enhanced thermal performance or industrial temperature specifications without PCB redesign.

Alternative for Package Flexibility: ICL3243ECAZ-T

The ICL3243ECAZ-T provides electrical equivalence with a 28-SSOP package variant (0.209" width versus 0.173" for TSSOP). This part maintains identical electrical specifications and operating temperature range (0°C ~ 70°C) as the original. Selection requires PCB footprint evaluation and layout modification. High inventory availability (20,100 units) supports procurement requirements.

Enhanced Performance Option: MAX3245ECUI+

The MAX3245ECUI+ offers superior data rate capability (1 Mbps versus 250 kbps) while maintaining all other critical parameters including 500 mV receiver hysteresis, 28-TSSOP package, and 3V ~ 5.5V supply voltage range. This part is suitable for applications requiring higher communication bandwidth within the same physical footprint.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, consistent with the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q1: Can MAX3243CPWR be used as a direct replacement for MAX3243CPWRG4?

Yes. Both parts share identical electrical specifications, package format (28-TSSOP), and functional characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tape & Reel), which does not affect circuit performance. No design modifications are required.

Q2: What is the difference between 28-TSSOP and 28-SSOP packages?

The 28-TSSOP package has a width of 0.173" (4.40mm), while the 28-SSOP package has a width of 0.209" (5.30mm). These are distinct footprints requiring different PCB pad layouts. Parts in 28-SSOP packages (such as ICL3243ECAZ) cannot be used on boards designed for 28-TSSOP without PCB redesign.

Q3: Why does MAX3243ECUI+ have lower data rate (120 kbps) than the original part (250 kbps)?

The MAX3243ECUI+ is a variant within the MAX3243 product family with different electrical specifications. While it maintains the same package and driver/receiver configuration, its data rate specification is 120 kbps. This part is suitable only for applications with lower bandwidth requirements.

Q4: What is the advantage of ICL3243EIAZ over ICL3243ECAZ?

The ICL3243EIAZ extends the operating temperature range to -40°C ~ 85°C, compared to 0°C ~ 70°C for the ICL3243ECAZ. Both parts maintain identical electrical specifications (250 kbps, 500 mV hysteresis) and 28-SSOP package format. Selection depends on application temperature requirements.

Q5: Is MAX3245ECUI+ compatible with designs requiring 250 kbps data rate?

Yes. The MAX3245ECUI+ supports data rates up to 1 Mbps, which exceeds the 250 kbps requirement. It maintains all other critical parameters including receiver hysteresis (500 mV), supply voltage (3V ~ 5.5V), and package format (28-TSSOP). This part provides backward compatibility with higher performance margin.

Q6: What does MSL rating indicate for these parts?

Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (unlimited) allows indefinite storage without special handling. MSL 2 (1 Year) and MSL 3 (168 Hours) require controlled storage environments. The original MAX3243CPWRG4 has MSL 1, while some substitutes have MSL 2 or 3, requiring appropriate storage protocol management.

Q7: Are all recommended substitutes RoHS3 compliant?

Yes. All parts listed in the substitute table maintain RoHS3 compliance and REACH unaffected status, consistent with regulatory requirements for the original MAX3243CPWRG4.

Q8: Which substitute offers the best inventory availability?

The ICL3243EIAZ-T offers the highest inventory level at 20,200 units, followed by ICL3243ECAZ-T at 20,100 units. The MAX3243CPWR provides 45,100 units, representing the largest available stock among all substitutes.

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