ICL3222CB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3222CB is a 2/2 full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation in an 18-SOIC surface mount package. This interface IC operates across a 3V to 5.5V supply range with a 250kbps data rate and 300mV receiver hysteresis, designed for serial communication applications requiring RS232 protocol compliance.

The ICL3222CB is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance or redesign initiatives.

Key Parameters

Parameter	ICL3222CB Value
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Package / Case	18-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Voltage - Supply	3V ~ 5.5V
Data Rate	250kbps
Receiver Hysteresis	300mV
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ICL3222CB is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 18-SOIC (0.295", 7.50mm Width) surface mount package to ensure PCB layout compatibility without redesign.
Functional Equivalence: All substitutes must provide 2/2 full-duplex RS232 transceiver functionality with identical driver and receiver configuration.
Electrical Operating Range: Supply voltage range of 3V to 5.5V is required for direct substitution in existing designs. Parts with narrower ranges (4.5V to 5.5V) are conditional substitutes requiring design verification.
Protocol Compliance: RS232 protocol implementation is mandatory for serial communication compatibility.
Data Rate Capability: The 250kbps minimum data rate requirement can be met by parts with equal or higher data rate specifications.
Receiver Hysteresis: The 300mV specification establishes the threshold for input signal discrimination. Parts with 300mV, 400mV, or 500mV hysteresis are functionally compatible, though higher values may affect noise immunity characteristics.

Substitute parts are grouped into two categories: direct substitutes (matching all critical parameters) and conditional substitutes (requiring design verification for specific parameter differences).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Data Rate	Receiver Hysteresis	Operating Temperature	RoHS Status	Packaging
ICL3222CB	Renesas Electronics	Obsolete	3V ~ 5.5V	250kbps	300mV	0°C ~ 70°C	RoHS non-compliant	Tube
ADM3222ARWZ	Analog Devices Inc.	Active	3V ~ 5.5V	460Kbps	400mV	-40°C ~ 85°C	ROHS3 Compliant	Tube
ADM3222ARWZ-REEL	Analog Devices Inc.	Active	3V ~ 5.5V	460Kbps	400mV	-40°C ~ 85°C	ROHS3 Compliant	Cut Tape & Digi-Reel
ADM3222ARWZ-REEL7	Analog Devices Inc.	Active	3V ~ 5.5V	460Kbps	400mV	-40°C ~ 85°C	ROHS3 Compliant	Cut Tape & Digi-Reel
MAX222CWN+	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 5.5V	250kbps	500mV	0°C ~ 70°C	ROHS3 Compliant	Tube
MAX222CWN+T	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 5.5V	250kbps	500mV	0°C ~ 70°C	ROHS3 Compliant	Tape & Reel
MAX222EWN+	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 5.5V	250kbps	500mV	-40°C ~ 85°C	ROHS3 Compliant	Tube
MAX222EWN+T	Analog Devices Inc./Maxim Integrated	Active	4.5V ~ 5.5V	250kbps	500mV	-40°C ~ 85°C	ROHS3 Compliant	Tape & Reel
MAX3222CWN+	Analog Devices Inc./Maxim Integrated	Active	3V ~ 5.5V	120Kbps	300mV	0°C ~ 70°C	ROHS3 Compliant	Tube
MAX3222CWN+T	Analog Devices Inc./Maxim Integrated	Active	3V ~ 5.5V	120Kbps	300mV	0°C ~ 70°C	ROHS3 Compliant	Cut Tape & Digi-Reel
MAX3222ECWN+	Analog Devices Inc./Maxim Integrated	Active	3V ~ 5.5V	1Mbps	500mV	0°C ~ 70°C	ROHS3 Compliant	Tube

Engineering Selection Recommendations

Direct Substitutes (Recommended for Obsolescence Replacement)

The ADM3222ARWZ, ADM3222ARWZ-REEL, and ADM3222ARWZ-REEL7 provide the closest functional equivalence to the ICL3222CB. These parts maintain the 3V to 5.5V supply voltage range, exceed the 250kbps data rate requirement with 460Kbps capability, and are manufactured by Analog Devices Inc. with active product status and ROHS3 compliance. The extended operating temperature range (-40°C to 85°C) provides additional environmental margin compared to the original 0°C to 70°C specification. Packaging options include tube, cut tape, and Digi-Reel formats to accommodate different procurement and assembly workflows.

Conditional Substitutes (Require Design Verification)

The MAX222 series (MAX222CWN+, MAX222CWN+T, MAX222EWN+, MAX222EWN+T) and MAX3222 series (MAX3222CWN+, MAX3222CWN+T, MAX3222ECWN+) are functionally compatible but require design verification for specific applications:

MAX222 variants operate within a narrower 4.5V to 5.5V supply range, excluding 3V operation. These parts are suitable only for designs with fixed 5V supply rails.
MAX3222CWN+ and MAX3222CWN+T operate at reduced data rates (120Kbps), limiting their use to low-speed serial applications.
MAX3222ECWN+ supports 1Mbps data rate with 500mV receiver hysteresis, suitable for high-speed applications requiring enhanced noise immunity.

All substitute parts are ROHS3 compliant and manufactured by Analog Devices Inc./Maxim Integrated with active product status, ensuring long-term supply availability and regulatory compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can the ADM3222ARWZ directly replace the ICL3222CB without PCB modifications?

A: Yes. Both parts use the 18-SOIC package with identical pinout and footprint. The ADM3222ARWZ maintains the 3V to 5.5V supply range and provides equivalent 2/2 full-duplex RS232 transceiver functionality. No PCB layout changes are required.

Q: What is the difference between ADM3222ARWZ, ADM3222ARWZ-REEL, and ADM3222ARWZ-REEL7?

A: These part numbers represent the same IC with different packaging and delivery formats. ADM3222ARWZ is supplied in tube packaging. ADM3222ARWZ-REEL and ADM3222ARWZ-REEL7 are supplied on cut tape with Digi-Reel carriers, differing in reel size. Electrical specifications are identical across all three variants.

Q: Why do MAX222 parts have a narrower voltage range (4.5V to 5.5V)?

A: The MAX222 series is optimized for 5V-only applications and does not support 3V operation. These parts are suitable only for designs with dedicated 5V supply rails. For designs requiring 3V to 5.5V operation, use ADM3222ARWZ or MAX3222 series alternatives.

Q: Is the higher receiver hysteresis (400mV or 500mV) in substitute parts a concern?

A: Higher receiver hysteresis improves noise immunity by increasing the input signal discrimination threshold. This is generally beneficial for noisy environments. However, it may slightly reduce sensitivity to weak input signals. For most RS232 applications operating within standard voltage levels, this difference is not functionally significant.

Q: Can MAX3222CWN+ replace ICL3222CB in high-speed applications?

A: No. MAX3222CWN+ operates at 120Kbps, below the ICL3222CB's 250kbps specification. This part is suitable only for low-speed serial communication. For equivalent or higher data rates, use ADM3222ARWZ (460Kbps) or MAX3222ECWN+ (1Mbps).

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original ICL3222CB is RoHS non-compliant. If RoHS compliance is required for new designs or regulatory purposes, any of the listed substitutes satisfy this requirement.

Q: What is the impact of the extended operating temperature range in ADM3222ARWZ?

A: The ADM3222ARWZ operates from -40°C to 85°C, compared to the ICL3222CB's 0°C to 70°C range. This extended range provides additional margin for industrial and automotive applications operating in extreme temperature environments. For standard commercial applications (0°C to 70°C), both specifications are equivalent.

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