ICL3232IB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3232IB is a 2/2 full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The ICL3232IB operates across a 3V to 5.5V supply range with a 250 kbps data rate and 300 mV receiver hysteresis, suitable for legacy serial communication applications requiring full RS232 protocol compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICL3232IB
Manufacturer	Renesas Electronics Corporation
Product Category	Interface / RS232 Transceiver
Type	Transceiver
Protocol	RS232
Drivers/Receivers Configuration	2/2 (Full Duplex)
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage Supply Range	3V ~ 5.5V
Operating Temperature Range	-40°C ~ 85°C
Data Rate	250 kbps
Receiver Hysteresis	300 mV
Product Status	Obsolete
RoHS Status	RoHS Non-Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ICL3232IB is determined by the following critical parameters:

Protocol Compliance: RS232 full-duplex transceiver functionality
Driver/Receiver Configuration: 2/2 (two drivers, two receivers)
Package Compatibility: 16-SOIC surface mount form factor
Voltage Supply Range: 3V to 5.5V operation
Operating Temperature Range: -40°C to 85°C
Data Rate: Minimum 250 kbps capability
Receiver Hysteresis: 300 mV or greater

Substitute parts are grouped into two categories based on package width specifications:

Category A - Narrow Package (0.154", 3.90mm Width): ADM3202ARNZ, ADM3202ARNZ-REEL, ADM3202ARNZ-REEL7, ADM3232EARNZ-REEL7

Category B - Wide Package (0.295", 7.50mm Width): ADM3202ARWZ, ADM3202ARWZ-REEL, ADM3202ARWZ-REEL7, MAX202CWE+, MAX202CWE+T

The ADM3232EARNZ variant uses a 16-SOP package and is listed for reference but requires PCB layout verification due to package geometry differences.

Parameter Comparison

Parameter	ICL3232IB	ADM3202ARNZ	ADM3202ARWZ	ADM3232EARNZ-REEL7	MAX202CWE+
Manufacturer	Renesas	Analog Devices	Analog Devices	Analog Devices	Analog Devices/Maxim
Protocol	RS232	RS232	RS232	RS232	RS232
Drivers/Receivers	2/2	2/2	2/2	2/2	2/2
Package / Case	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.295", 7.50mm)
Voltage Supply Range	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	3V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Data Rate	250 kbps	460 kbps	460 kbps	460 kbps	120 kbps
Receiver Hysteresis	300 mV	400 mV	400 mV	500 mV	500 mV
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

For applications requiring the wide 16-SOIC package (0.295", 7.50mm Width) with full parameter compatibility:

ADM3202ARWZ or ADM3202ARWZ-REEL7: Active product status with ROHS3 compliance. Supports 3V to 5.5V supply range, -40°C to 85°C operating temperature, and 460 kbps data rate. Receiver hysteresis of 400 mV exceeds the ICL3232IB specification of 300 mV, providing improved noise margin.
MAX202CWE+T: Active product status with ROHS3 compliance. Operates within 4.5V to 5.5V supply range (narrower than ICL3232IB) and 0°C to 70°C temperature range. Data rate of 120 kbps is below the ICL3232IB specification. Suitable only for applications not requiring the full 3V minimum supply or extended temperature range.

Alternative Substitutes (Package Width Consideration)

For applications where PCB layout permits the narrow 16-SOIC package (0.154", 3.90mm Width):

ADM3202ARNZ-REEL7: Active product status with ROHS3 compliance. Meets all electrical specifications of the ICL3232IB with 3V to 5.5V supply, -40°C to 85°C operation, and 460 kbps data rate. Narrow package reduces PCB footprint.
ADM3232EARNZ-REEL7: Active product status with ROHS3 compliance. Supports full parameter range with 500 mV receiver hysteresis. Package geometry is 16-SOIC (0.154", 3.90mm Width).

Compliance Considerations

All recommended substitute parts are ROHS3 compliant and REACH unaffected, addressing environmental regulatory requirements that the obsolete ICL3232IB does not meet. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can the ADM3202ARWZ directly replace the ICL3232IB without PCB modifications?

A: Yes, the ADM3202ARWZ is pin-compatible and uses the same 16-SOIC (0.295", 7.50mm Width) package as the ICL3232IB. No PCB layout changes are required. Electrical specifications are compatible across the 3V to 5.5V supply range and -40°C to 85°C operating temperature.

Q: What is the difference between ADM3202ARNZ and ADM3202ARWZ?

A: Both are functionally identical RS232 transceivers from Analog Devices. The primary difference is package width: ARNZ uses a narrow 16-SOIC (0.154", 3.90mm Width) package, while ARWZ uses a wide 16-SOIC (0.295", 7.50mm Width) package. Select based on PCB footprint requirements and existing layout constraints.

Q: Why does the MAX202CWE+ have a lower data rate (120 kbps) than the ICL3232IB (250 kbps)?

A: The MAX202CWE+ is an older generation RS232 transceiver design with inherent speed limitations. While it meets the 2/2 full-duplex RS232 protocol requirement, applications requiring data rates above 120 kbps should use ADM3202 or ADM3232 series alternatives.

Q: Is the MAX202CWE+ suitable for applications requiring 3V supply operation?

A: No. The MAX202CWE+ operates within a 4.5V to 5.5V supply range, which does not include the 3V to 3.3V range supported by the ICL3232IB and ADM3202 series. Use ADM3202ARWZ or ADM3202ARNZ for applications requiring 3V minimum supply voltage.

Q: What does the receiver hysteresis specification mean for substitution?

A: Receiver hysteresis defines the voltage difference between rising and falling threshold levels, affecting noise immunity. The ICL3232IB specifies 300 mV hysteresis. Substitute parts with 400 mV or 500 mV hysteresis provide equal or improved noise margin and are fully compatible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts (ADM3202 and MAX202 series) are ROHS3 compliant. The original ICL3232IB is RoHS non-compliant. Substitution addresses environmental regulatory requirements for new designs and system updates.

Q: Can I use ADM3232EARNZ-REEL7 as a substitute if my PCB uses the wide package footprint?

A: No. The ADM3232EARNZ-REEL7 uses a 16-SOP package geometry, which differs from the 16-SOIC package used by the ICL3232IB. PCB layout verification and potential redesign would be required. Use ADM3202ARWZ or MAX202CWE+ for wide package compatibility.

Q: What is the difference between tube and reel packaging options?

A: Tube packaging (e.g., ADM3202ARWZ) is suitable for lower-volume applications and manual assembly. Reel packaging (e.g., ADM3202ARWZ-REEL, ADM3202ARWZ-REEL7) is optimized for automated pick-and-place assembly and higher production volumes. Electrical specifications are identical; selection depends on assembly process requirements.

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