MAX3241CUI RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3241CUI is a full-duplex RS232 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated, designed for 3/5 driver/receiver configurations in surface-mount 28-TSSOP packaging. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The MAX3241CUI operates across 3V to 5.5V supply voltage with a 235 kbps data rate and 300 mV receiver hysteresis, suitable for legacy RS232 communication applications requiring compact form factors.

Substiute Parts

MAX3241CUI

Analog Devices Inc./Maxim IntegratedIn Stock: 2342MAX3241CUI Datasheet

Current PartRFQ

MAX3241CUI+

Analog Devices Inc./Maxim IntegratedIn Stock: 956MAX3241CUI+ Datasheet

Parametric EquivalentRFQ

ICL3241ECAZ

Renesas Electronics CorporationIn Stock: 2549ICL3241ECAZ Datasheet

MFR RecommendedRFQ

ICL3241ECAZ-T

Renesas Electronics CorporationIn Stock: 2474ICL3241ECAZ-T Datasheet

MFR RecommendedRFQ

ICL3241EIAZ

Renesas Electronics CorporationIn Stock: 1487ICL3241EIAZ Datasheet

MFR RecommendedRFQ

ICL3241EIAZ-T

Renesas Electronics CorporationIn Stock: 5258ICL3241EIAZ-T Datasheet

MFR RecommendedRFQ

ICL3241EIVZ

Renesas Electronics CorporationIn Stock: 1277ICL3241EIVZ Datasheet

MFR RecommendedRFQ

ICL3241EIVZ-T

Renesas Electronics CorporationIn Stock: 3934ICL3241EIVZ-T Datasheet

MFR RecommendedRFQ

ST3241EBPR

STMicroelectronicsIn Stock: 6648ST3241EBPR Datasheet

MFR RecommendedRFQ

ST3241ECPR

STMicroelectronicsIn Stock: 2633ST3241ECPR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX3241CUI is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Protocol: RS232
• Number of Drivers/Receivers: 3/5
• Duplex: Full
• Voltage - Supply: 3V ~ 5.5V
• Mounting Type: Surface Mount

Package Compatibility Levels:

• Direct Package Match: 28-TSSOP (0.173", 4.40mm Width) — identical footprint and pinout
• Compatible Package: 28-SSOP (0.209", 5.30mm Width) — same pin count and signal assignment, different physical dimensions

Secondary Considerations:

• Data Rate: 235 kbps (MAX3241CUI) vs. 250 kbps (substitute parts) — substitute parts meet or exceed this requirement
• Receiver Hysteresis: 300 mV (MAX3241CUI) vs. 500 mV (Renesas ICL3241 series) — higher hysteresis in substitutes provides improved noise immunity
• Operating Temperature: 0°C ~ 70°C (MAX3241CUI) vs. -40°C ~ 85°C (extended-range substitutes) — extended-range parts provide broader environmental coverage
• RoHS Compliance: MAX3241CUI is non-compliant; all active substitutes are ROHS3 compliant

Substitutes are grouped into two categories: parametric equivalents (same package, active status) and manufacturer-recommended alternatives (compatible packages, active status, enhanced specifications).

Parameter Comparison

Engineering Selection Recommendations

For Direct Footprint Replacement (28-TSSOP Package):

MAX3241CUI+ is the primary active equivalent, offering identical package geometry, electrical specifications, and pinout. This part transitions the obsolete MAX3241CUI to an active product status while maintaining ROHS3 compliance and Tube packaging. Selection of MAX3241CUI+ eliminates redesign requirements and PCB layout modifications.

ICL3241EIVZ and ICL3241EIVZ-T (Renesas) provide direct 28-TSSOP package compatibility with enhanced specifications: 250 kbps data rate (vs. 235 kbps), 500 mV receiver hysteresis (vs. 300 mV), and extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C). These parts are suitable for applications requiring improved noise immunity and broader environmental operation. ICL3241EIVZ-T offers Tape & Reel packaging for high-volume production.

For Package-Compatible Substitution (28-SSOP Package):

ICL3241 series (ECAZ, ECAZ-T, EIAZ, EIAZ-T) and ST3241 series (EBPR, ECPR) provide 28-SSOP package compatibility. These parts require PCB layout modification due to different physical dimensions (0.209" vs. 0.173" width) but maintain identical pin count and signal assignment. Selection depends on operating temperature requirements:

• ICL3241ECAZ / ICL3241ECAZ-T: 0°C ~ 70°C operating range, matching MAX3241CUI temperature specification
• ICL3241EIAZ / ICL3241EIAZ-T: -40°C ~ 85°C extended operating range
• ST3241EBPR: -40°C ~ 85°C extended operating range, 300 mV receiver hysteresis (matching MAX3241CUI)
• ST3241ECPR: 0°C ~ 70°C operating range, 300 mV receiver hysteresis

All substitute parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can MAX3241CUI+ be used as a direct replacement for MAX3241CUI?

A: Yes. MAX3241CUI+ is electrically and mechanically identical to MAX3241CUI, with identical 28-TSSOP package, pinout, and electrical specifications. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No design changes are required.

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

A: Both packages contain 28 pins with identical signal assignments and pinout. The primary difference is physical width: 28-TSSOP is 0.173" (4.40mm) wide, while 28-SSOP is 0.209" (5.30mm) wide. Substitution between these packages requires PCB layout modification but maintains electrical compatibility.

Q: Why do Renesas ICL3241 parts specify 500 mV receiver hysteresis instead of 300 mV?

A: Receiver hysteresis is the voltage difference required to switch the receiver output. Higher hysteresis (500 mV vs. 300 mV) provides improved noise immunity in electrically noisy environments but requires larger input signal swings. Both values meet RS232 specification requirements. Selection depends on application noise characteristics.

Q: Which substitute part should I select for new designs?

A: For new designs, select based on package preference and operating temperature requirements. For 28-TSSOP package: ICL3241EIVZ-T or ICL3241EIVZ offer enhanced specifications and extended temperature range. For 28-SSOP package: ICL3241EIAZ-T or ST3241EBPR provide -40°C ~ 85°C operation. All are ROHS3 compliant and carry active product status.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original MAX3241CUI is RoHS non-compliant. Substitution to any listed part ensures compliance with current environmental regulations.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging is suitable for low-to-medium volume applications and manual assembly. Tape & Reel (TR) packaging is optimized for high-volume automated assembly processes. Electrical specifications are identical; packaging selection depends on production volume and assembly method.

Q: Can I use ST3241EBPR in place of MAX3241CUI?

A: Yes, with PCB layout modification. ST3241EBPR provides 28-SSOP package (vs. 28-TSSOP), requiring footprint redesign. Electrical specifications are compatible: 3/5 full-duplex RS232 transceiver, 3V ~ 5.5V supply, 250 kbps data rate. ST3241EBPR offers extended -40°C ~ 85°C operating temperature and 300 mV receiver hysteresis matching MAX3241CUI.

Q: What is the data rate difference between MAX3241CUI (235 kbps) and substitute parts (250 kbps)?

A: The 15 kbps difference is within normal manufacturing tolerance and does not affect RS232 protocol compliance. Substitute parts rated at 250 kbps meet or exceed the MAX3241CUI specification and are fully compatible for applications operating at 235 kbps or lower.