ICL3241IAZ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3241IAZ is a full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation, configured with 3 drivers and 5 receivers in a 28-SSOP surface mount package. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and protocol standards to ensure direct replacement capability.

Key Parameters

Parameter	ICL3241IAZ
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Drivers/Receivers	3/5
Duplex	Full
Data Rate	250 kbps
Supply Voltage	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	28-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	300 mV
RoHS Status	ROHS3 Compliant
MSL Rating	2 (1 Year)

Substitute Part Grouping Explanation

Substitution eligibility for the ICL3241IAZ is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Protocol: RS232
Configuration: 3 Drivers / 5 Receivers
Duplex Mode: Full
Package: 28-SSOP (0.209", 5.30mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: 3V ~ 5.5V (minimum overlap required)

Allowable Parameter Variations:

Data Rate: 235 kbps or higher
Operating Temperature: Must encompass or match the required range
Receiver Hysteresis: 300 mV or 500 mV acceptable
Manufacturer: Different manufacturers permitted if electrical and mechanical specifications align
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories based on parameter alignment with the original ICL3241IAZ specification.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Data Rate	Operating Temp	Receiver Hysteresis	Supply Voltage	Product Status	MSL Rating
ICL3241IAZ	Renesas	3/5	250 kbps	-40°C ~ 85°C	300 mV	3V ~ 5.5V	Obsolete	2 (1 Year)
ICL3241EIAZ	Renesas	3/5	250 kbps	-40°C ~ 85°C	500 mV	3V ~ 5.5V	Active	2 (1 Year)
MAX3241EEAI+	Analog Devices/Maxim	3/5	250 kbps	-40°C ~ 85°C	500 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241EEAI+T	Analog Devices/Maxim	3/5	250 kbps	-40°C ~ 85°C	500 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241CAI+	Analog Devices/Maxim	3/5	235 kbps	0°C ~ 70°C	300 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241CAI+T	Analog Devices/Maxim	3/5	235 kbps	0°C ~ 70°C	300 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241EAI+	Analog Devices/Maxim	3/5	235 kbps	-40°C ~ 85°C	300 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241EAI+T	Analog Devices/Maxim	3/5	235 kbps	-40°C ~ 85°C	300 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241ECAI+	Analog Devices/Maxim	3/5	250 kbps	0°C ~ 70°C	500 mV	3V ~ 5.5V	Active	1 (Unlimited)
MAX3241ECAI+T	Analog Devices/Maxim	3/5	250 kbps	0°C ~ 70°C	500 mV	3V ~ 5.5V	Active	1 (Unlimited)
ST3241EBPR	STMicroelectronics	3/5	250 kbps	-40°C ~ 85°C	300 mV	3V ~ 5.5V	Active	3 (168 Hours)

Engineering Selection Recommendations

Tier 1 - Full Specification Match (Preferred for Direct Replacement):

ICL3241EIAZ and ST3241EBPR maintain the complete operating temperature range (-40°C ~ 85°C), 250 kbps data rate, and 3V ~ 5.5V supply voltage specification of the original ICL3241IAZ. Both are active products with current manufacturing status. ICL3241EIAZ is a Renesas variant with identical base product lineage. ST3241EBPR is manufactured by STMicroelectronics and provides equivalent electrical performance with ROHS3 compliance.

Tier 2 - Extended Temperature Range with Reduced Operating Window:

MAX3241EEAI+ and MAX3241EEAI+T (Analog Devices/Maxim) maintain the full -40°C ~ 85°C operating temperature range and 250 kbps data rate. These parts feature improved MSL rating (1, Unlimited) compared to the original specification. Packaging options include tube (EEAI+) and cut tape with Digi-Reel (EEAI+T).

Tier 3 - Restricted Temperature Range:

MAX3241ECAI+ and MAX3241ECAI+T operate within 0°C ~ 70°C temperature range with 250 kbps data rate. These are suitable for applications where the full military temperature range is not required. MAX3241CAI+, MAX3241CAI+T, MAX3241EAI+, and MAX3241EAI+T operate at 235 kbps data rate with either 0°C ~ 70°C or -40°C ~ 85°C temperature ranges. Selection within this tier depends on specific application temperature requirements and data rate tolerance.

All substitute parts maintain ROHS3 compliance and REACH unaffected status. Packaging format selection (tube, tape & reel, or cut tape) should align with production assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX3241 series parts directly replace the ICL3241IAZ?

A: Yes, MAX3241 series parts are direct functional replacements when operating temperature and data rate requirements are satisfied. All MAX3241 variants maintain the 3/5 driver/receiver configuration, RS232 protocol, full-duplex operation, and 28-SSOP package. Verify that your application temperature range does not exceed the substitute part's operating limits. MAX3241EEAI+ and MAX3241EEAI+T provide the closest match to the original -40°C ~ 85°C specification.

Q: What is the difference between ICL3241EIAZ and ICL3241IAZ?

A: ICL3241EIAZ is the active production variant of the obsolete ICL3241IAZ. Both are manufactured by Renesas Electronics and share identical electrical specifications, package, and pin configuration. The primary difference is product status: ICL3241EIAZ is currently in active production with guaranteed long-term availability, while ICL3241IAZ is obsolete. Receiver hysteresis differs slightly (500 mV vs. 300 mV), but this does not affect functional compatibility in standard RS232 applications.

Q: Are there packaging format differences between substitute parts?

A: Yes. Substitute parts are available in multiple packaging formats: tube, tape & reel (TR), and cut tape with Digi-Reel (CT). The tube format is suitable for manual assembly or small-volume production. Tape & reel and cut tape formats are optimized for automated pick-and-place assembly. All formats contain identical die and electrical specifications; selection depends on production assembly methodology and volume requirements.

Q: What does MSL rating mean, and why does it vary?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering without baking. MSL 2 (1 Year) allows one year of storage without moisture conditioning. MSL 1 (Unlimited) requires no moisture conditioning and provides superior shelf life stability. The original ICL3241IAZ specifies MSL 2; substitute parts with MSL 1 offer improved storage reliability without additional handling requirements.

Q: Can I use MAX3241 parts rated for 0°C ~ 70°C in applications requiring -40°C ~ 85°C operation?

A: No. Operating temperature range is a critical specification. Parts rated for 0°C ~ 70°C (such as MAX3241CAI+, MAX3241CAI+T, MAX3241ECAI+, MAX3241ECAI+T) must not be used in applications requiring the full -40°C ~ 85°C range. Use only parts with matching or extended temperature specifications: ICL3241EIAZ, MAX3241EEAI+, MAX3241EEAI+T, MAX3241EAI+, MAX3241EAI+T, or ST3241EBPR.

Q: Is the 235 kbps data rate of some MAX3241 variants acceptable as a substitute for 250 kbps?

A: Data rate compatibility depends on application requirements. If your system operates at or below 235 kbps, MAX3241CAI+, MAX3241CAI+T, MAX3241EAI+, and MAX3241EAI+T are acceptable substitutes. If your application requires 250 kbps operation, use only parts specified at 250 kbps: ICL3241EIAZ, MAX3241EEAI+, MAX3241EEAI+T, MAX3241ECAI+, MAX3241ECAI+T, or ST3241EBPR.

Q: What is the significance of receiver hysteresis differences (300 mV vs. 500 mV)?

A: Receiver hysteresis affects noise immunity and switching threshold characteristics. The original ICL3241IAZ specifies 300 mV hysteresis. Substitute parts with 500 mV hysteresis (ICL3241EIAZ, MAX3241EEAI+, MAX3241EEAI+T, MAX3241ECAI+, MAX3241ECAI+T) provide enhanced noise immunity in electrically noisy environments. Parts with 300 mV hysteresis (MAX3241CAI+, MAX3241CAI+T, MAX3241EAI+, MAX3241EAI+T, ST3241EBPR) maintain the original specification. Both are functionally compatible with standard RS232 applications.

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