MAX3241EUI RS232 Transceiver Interface IC - Equivalent & Substitute Parts

Part Overview

The MAX3241EUI is a full-duplex RS232 transceiver interface IC manufactured by Analog Devices Inc./Maxim Integrated, configured with 3 drivers and 5 receivers in a 28-TSSOP surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across a 3V to 5.5V supply range with a 235 kbps data rate and -40°C to 85°C operating temperature range, making it suitable for legacy industrial and embedded communication applications.

Key Parameters

Parameter	MAX3241EUI Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	235 kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	28-TSSOP (0.173", 4.40mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX3241EUI is determined by strict equivalence across the following critical parameters:

Protocol Compliance: All substitutes must implement full-duplex RS232 transceiver functionality
Driver/Receiver Configuration: 3 drivers and 5 receivers configuration must be maintained
Supply Voltage Range: 3V to 5.5V compatibility is mandatory
Package Compatibility: Substitutes are grouped by package type (28-TSSOP vs. 28-SSOP)
Data Rate: Minimum 235 kbps performance requirement
Operating Temperature Range: Extended range (-40°C to 85°C) preferred for industrial applications
Product Status: Active parts are prioritized over obsolete classifications

Substitutes are organized into two primary groups based on package type: 28-TSSOP direct pin-compatible replacements and 28-SSOP alternatives requiring PCB layout modification. Within each group, variants differ by manufacturer, RoHS compliance status, and packaging format (tube, tape & reel, or cut tape).

Parameter Comparison

Part Number	Manufacturer	Package	Drivers/Receivers	Data Rate	Hysteresis	Temp Range	RoHS Status	Product Status
MAX3241EUI	Analog Devices/Maxim	28-TSSOP	3/5	235 kbps	300 mV	-40°C ~ 85°C	Non-compliant	Obsolete
MAX3241EUI+	Analog Devices/Maxim	28-TSSOP	3/5	235 kbps	300 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
ICL3241EIVZ	Renesas Electronics	28-TSSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
ICL3241EIVZ-T	Renesas Electronics	28-TSSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
MAX3243IPWR	Texas Instruments	28-TSSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
ICL3241ECAZ	Renesas Electronics	28-SSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	ROHS3 Compliant	Active
ICL3241ECAZ-T	Renesas Electronics	28-SSOP	3/5	250 kbps	500 mV	0°C ~ 70°C	ROHS3 Compliant	Active
ICL3241EIAZ	Renesas Electronics	28-SSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
ICL3241EIAZ-T	Renesas Electronics	28-SSOP	3/5	250 kbps	500 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
ST3241EBPR	STMicroelectronics	28-SSOP	3/5	250 kbps	300 mV	-40°C ~ 85°C	ROHS3 Compliant	Active
ST3241ECPR	STMicroelectronics	28-SSOP	3/5	250 kbps	300 mV	0°C ~ 70°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Pin-Compatible Replacement (28-TSSOP Package)

For applications requiring no PCB layout modification, MAX3241EUI+ provides parametric equivalence with ROHS3 compliance and active product status. ICL3241EIVZ and ICL3241EIVZ-T (Renesas) offer extended temperature range (-40°C to 85°C) with improved data rate (250 kbps) and are available in both tube and tape & reel packaging. MAX3243IPWR (Texas Instruments) provides the same package footprint with active status and high inventory availability (21,200 units).

Package-Compatible Alternative (28-SSOP Package)

When PCB layout permits a 0.036" (0.91mm) width increase, 28-SSOP alternatives provide additional sourcing options. ICL3241EIAZ and ICL3241EIAZ-T maintain the full -40°C to 85°C operating range with ROHS3 compliance. ST3241EBPR and ST3241ECPR (STMicroelectronics) offer hysteresis matching the original part (300 mV) with extended temperature support (ST3241EBPR only).

Compliance Considerations

All recommended substitutes carry ROHS3 compliance certification. The original MAX3241EUI is RoHS non-compliant; migration to compliant alternatives is necessary for new designs and regulatory adherence. Moisture sensitivity levels vary across substitutes (MSL 1-3); procurement and storage protocols must align with component specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX3241EUI+ be used as a direct replacement without PCB modification?

A: Yes. MAX3241EUI+ maintains identical pin configuration, package dimensions (28-TSSOP), and electrical parameters. The primary difference is ROHS3 compliance status and active product availability.

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

A: 28-TSSOP measures 0.173" (4.40mm) width, while 28-SSOP measures 0.209" (5.30mm) width. TSSOP is a thinner shrink package. Direct pin-for-pin substitution requires matching package type; SSOP alternatives require PCB layout redesign.

Q: Are Renesas ICL3241 variants fully compatible with MAX3241EUI?

A: ICL3241 variants maintain 3/5 driver/receiver configuration, RS232 protocol, and 3V-5.5V supply range. Key differences include higher receiver hysteresis (500 mV vs. 300 mV), improved data rate (250 kbps vs. 235 kbps), and extended product lifecycle (active status). Temperature range varies by part number suffix.

Q: Which substitute offers the best inventory availability?

A: MAX3243IPWR (Texas Instruments) provides the highest inventory level at 21,200 units in stock, with 28-TSSOP package compatibility and -40°C to 85°C operating range.

Q: Does operating temperature range affect substitution eligibility?

A: Yes. For applications requiring -40°C to 85°C operation, ICL3241EIAZ, ICL3241EIAZ-T, ICL3241EIVZ, ICL3241EIVZ-T, MAX3243IPWR, and ST3241EBPR are qualified. Parts with 0°C to 70°C range (ICL3241ECAZ, ICL3241ECAZ-T, ST3241ECPR) are restricted to commercial temperature applications.

Q: What is the significance of receiver hysteresis differences?

A: Receiver hysteresis (300 mV vs. 500 mV) affects noise immunity and signal threshold behavior. Higher hysteresis (500 mV) provides improved noise rejection in electrically noisy environments. The original MAX3241EUI specifies 300 mV; substitutes with 500 mV hysteresis offer enhanced performance but may require signal level verification in existing designs.

Q: Are tape & reel (-T suffix) variants electrically identical to tube packaging?

A: Yes. Packaging format (-T for tape & reel, no suffix for tube) does not affect electrical performance. Selection depends on assembly process requirements and procurement volume.

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