ICL3222CBZ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3222CBZ 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 ICL3222CBZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this transceiver.

Key Parameters

Parameter	ICL3222CBZ Value
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	250kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	18-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the ICL3222CBZ is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

Protocol: RS232
Number of Drivers/Receivers: 2/2
Duplex: Full
Mounting Type: Surface Mount
Package / Case: 18-SOIC (0.295", 7.50mm Width)
Voltage - Supply: 3V ~ 5.5V (minimum requirement)

Allowable Variation Parameters:

Receiver Hysteresis: 300mV to 500mV (higher hysteresis acceptable for noise immunity)
Data Rate: 250kbps or higher (backward compatible)
Operating Temperature: Extended ranges acceptable (0°C ~ 70°C minimum)
Product Status: Active preferred over obsolete
Packaging Format: Tube, Cut Tape & Digi-Reel, or Tape & Reel formats all acceptable

All substitute parts listed meet the mandatory matching criteria. Variations in receiver hysteresis, data rate, and operating temperature represent functional improvements or extended specifications that do not compromise pin-level or protocol compatibility.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status
ICL3222CBZ	Renesas Electronics	RS232	2/2	300 mV	250kbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	Obsolete
ADM3222ARWZ	Analog Devices Inc.	RS232	2/2	400 mV	460Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	Active
ADM3222ARWZ-REEL	Analog Devices Inc.	RS232	2/2	400 mV	460Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	Active
ADM3222ARWZ-REEL7	Analog Devices Inc.	RS232	2/2	400 mV	460Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	Active
MAX222CWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	500 mV	250kbps	4.5V ~ 5.5V	0°C ~ 70°C	18-SOIC	Active
MAX222CWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	500 mV	250kbps	4.5V ~ 5.5V	0°C ~ 70°C	18-SOIC	Active
MAX222EWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	500 mV	250kbps	4.5V ~ 5.5V	-40°C ~ 85°C	18-SOIC	Active
MAX222EWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	500 mV	250kbps	4.5V ~ 5.5V	-40°C ~ 85°C	18-SOIC	Active
MAX3222CWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	300 mV	120Kbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	Active
MAX3222CWN+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	300 mV	120Kbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	Active
MAX3222ECWN+	Analog Devices Inc./Maxim Integrated	RS232	2/2	500 mV	1Mbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The ADM3222ARWZ series (ADM3222ARWZ, ADM3222ARWZ-REEL, ADM3222ARWZ-REEL7) from Analog Devices Inc. represents the most direct functional replacement. These parts maintain full RS232 2/2 transceiver architecture in 18-SOIC packaging with 3V to 5.5V supply compatibility. The extended operating temperature range (-40°C to 85°C) and higher data rate (460Kbps) provide enhanced performance margins. All variants are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

Secondary Substitutes (Conditional Compatibility):

The MAX3222ECWN+ offers the highest data rate capability (1Mbps) while maintaining the original 3V to 5.5V supply range and 18-SOIC package. This part is suitable for applications requiring higher bandwidth. The MAX222 series (MAX222CWN+, MAX222CWN+T, MAX222EWN+, MAX222EWN+T) operates at a narrower supply range (4.5V to 5.5V), limiting compatibility to 5V-only systems. These parts are appropriate only when the design operates exclusively at 5V supply.

The MAX3222CWN+ and MAX3222CWN+T variants operate at reduced data rates (120Kbps), suitable only for legacy or low-speed serial communication applications.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 export classification matching the original ICL3222CBZ. Moisture sensitivity levels are improved or equivalent across all active substitutes.

Frequently Asked Questions (FAQ)

Q: Can the ADM3222ARWZ series directly replace the ICL3222CBZ without PCB modifications?

A: Yes. The ADM3222ARWZ, ADM3222ARWZ-REEL, and ADM3222ARWZ-REEL7 are pin-compatible 18-SOIC packages with identical driver/receiver configuration (2/2 full-duplex RS232). No PCB layout changes are required. The difference in packaging format (Tube vs. Cut Tape & Digi-Reel) affects only component procurement and assembly handling, not electrical performance.

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

A: These three part numbers represent the same IC with different packaging and reel configurations. ADM3222ARWZ is supplied in Tube format. ADM3222ARWZ-REEL and ADM3222ARWZ-REEL7 are supplied on Cut Tape & Digi-Reel with different reel quantities. Electrical specifications and pin configuration are identical across all three variants.

Q: Why do MAX222 series parts specify 4.5V to 5.5V supply instead of 3V to 5.5V?

A: The MAX222 series is designed for 5V-only applications and does not support 3V operation. These parts are substitutes only for designs that operate exclusively at 5V supply voltage. If your application requires 3V to 5V operation, use ADM3222ARWZ or MAX3222ECWN+ instead.

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

A: No. Higher receiver hysteresis improves noise immunity and signal integrity. The ICL3222CBZ specifies 300mV hysteresis; substitute parts with 400mV or 500mV hysteresis maintain RS232 protocol compliance while providing enhanced noise rejection. This is a functional improvement, not a limitation.

Q: Can I use MAX3222CWN+ or MAX3222CWN+T as substitutes?

A: These parts are functionally compatible but operate at reduced data rate (120Kbps vs. 250Kbps). Use these only if your application does not require the full 250kbps bandwidth of the original ICL3222CBZ. For applications requiring 250kbps or higher, use ADM3222ARWZ or MAX3222ECWN+ instead.

Q: What is the advantage of MAX3222ECWN+ over other substitutes?

A: The MAX3222ECWN+ supports the highest data rate (1Mbps) while maintaining the original 3V to 5.5V supply range. This part is suitable for future-proofing designs that may require higher serial communication speeds. It remains pin-compatible in the 18-SOIC package.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance matching the original ICL3222CBZ specification. All parts are also REACH unaffected and classified as EAR99 for export purposes.

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