ICL3221CV RS232 Transceiver Interface IC

Part Overview

The ICL3221CV is a full-duplex RS232 transceiver interface IC manufactured by Renesas Electronics Corporation, designed for serial communication applications requiring 1/1 driver/receiver configuration. This component operates across a 3V to 5.5V supply range with a 250kbps data rate and 300mV receiver hysteresis, housed in a 16-TSSOP surface mount package.

The ICL3221CV is classified as obsolete. Identifying equivalent and substitute parts is necessary to support ongoing production requirements, legacy system maintenance, and design flexibility when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICL3221CV
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250kbps
Receiver Hysteresis	300 mV
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ICL3221CV is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232
Number of Drivers/Receivers: 1/1
Duplex: Full
Voltage - Supply: 3V ~ 5.5V
Mounting Type: Surface Mount
Package / Case: 16-TSSOP (0.173", 4.40mm Width)

Allowable Variation Parameters:

Data Rate: 250kbps or higher (backward compatible)
Receiver Hysteresis: 300mV or 500mV (both acceptable for RS232 applications)
Operating Temperature: 0°C ~ 70°C or extended range (-40°C ~ 85°C)
Product Status: Active or Obsolete
RoHS Compliance: Compliant or non-compliant (application-dependent)

Substitute parts are grouped into three categories based on their relationship to the ICL3221CV:

Parametric Equivalents: Parts with identical electrical specifications and package, differing only in manufacturer or product status.

Direct Substitutes: Parts with enhanced specifications (higher data rate, improved receiver hysteresis) that maintain full backward compatibility.

Upgrade Options: Parts with extended operating temperature ranges or improved compliance certifications, suitable for applications requiring higher reliability or regulatory compliance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Voltage - Supply	Operating Temperature	Package	Product Status	RoHS Status
ICL3221CV	Renesas Electronics	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Obsolete	Non-compliant
ICL3221CVZ	Intersil	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	ROHS3 Compliant
ISL83220ECVZ	Renesas Electronics	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Obsolete	ROHS3 Compliant
SN75C3221PW	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Obsolete	ROHS3 Compliant
SN75C3221PWR	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	ROHS3 Compliant
TRSF3221ECPW	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Obsolete	ROHS3 Compliant
TRSF3221ECPWR	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	ROHS3 Compliant
MAX3221EIPWR	Texas Instruments	RS232	1/1	250kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Active	ROHS3 Compliant
SN65C3221PW	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Obsolete	ROHS3 Compliant
SN65C3221PWR	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-TSSOP	Active	ROHS3 Compliant
MAX3221CDB	Texas Instruments	RS232	1/1	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): ICL3221CVZ is the primary parametric equivalent, offering identical electrical performance with active product status and ROHS3 compliance. This part is recommended for applications requiring exact specification matching with improved supply chain availability.

For Active Production Requirements: SN75C3221PWR and TRSF3221ECPWR are active products from Texas Instruments with enhanced data rate capability (1Mbps) and ROHS3 compliance. These parts provide superior performance headroom while maintaining full backward compatibility with the ICL3221CV electrical interface.

For Extended Temperature Range Applications: MAX3221EIPWR and SN65C3221PWR extend the operating temperature range to -40°C ~ 85°C, suitable for industrial and automotive environments. Both maintain ROHS3 compliance and active product status.

For Legacy System Support: ISL83220ECVZ from Renesas Electronics provides parametric equivalence with ROHS3 compliance, maintaining the original manufacturer ecosystem while addressing obsolescence concerns.

Package Consideration: MAX3221CDB uses a 16-SSOP package (0.209", 5.30mm Width) instead of 16-TSSOP. This part is suitable only for applications where PCB layout accommodates the wider package footprint.

Frequently Asked Questions (FAQ)

Q: Can I use SN75C3221PWR as a direct replacement for ICL3221CV? A: Yes. SN75C3221PWR maintains all critical parameters: RS232 protocol, 1/1 driver/receiver configuration, full duplex operation, 3V ~ 5.5V supply range, and 16-TSSOP package. The enhanced 1Mbps data rate and 500mV receiver hysteresis provide improved performance margins while remaining fully backward compatible.

Q: What is the difference between ICL3221CVZ and ISL83220ECVZ? A: Both are parametric equivalents with identical electrical specifications (250kbps data rate, 300mV receiver hysteresis). ICL3221CVZ is manufactured by Intersil with active product status. ISL83220ECVZ is manufactured by Renesas Electronics with obsolete status. Both offer ROHS3 compliance.

Q: Why would I choose MAX3221EIPWR over other substitutes? A: MAX3221EIPWR provides extended operating temperature range (-40°C ~ 85°C) compared to the ICL3221CV (0°C ~ 70°C), making it suitable for industrial and automotive applications. It maintains active product status and ROHS3 compliance with identical 250kbps data rate specification.

Q: Is MAX3221CDB compatible with ICL3221CV? A: MAX3221CDB is electrically compatible but uses a 16-SSOP package instead of 16-TSSOP. The package footprint is wider (5.30mm vs 4.40mm), requiring PCB layout verification before substitution. This part is suitable only if your design accommodates the larger package dimensions.

Q: What does ROHS3 compliance mean for my application? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. The original ICL3221CV is RoHS non-compliant. If your application or market requires RoHS compliance, select from the ROHS3-compliant alternatives listed.

Q: Can I use parts with 500mV receiver hysteresis instead of 300mV? A: Yes. The 500mV receiver hysteresis in parts like SN75C3221PWR and TRSF3221ECPWR provides improved noise immunity compared to the 300mV specification of ICL3221CV. This is a performance enhancement that maintains full backward compatibility with RS232 interface requirements.

Q: What is the significance of "Active" vs "Obsolete" product status? A: Active products have ongoing manufacturing and supply chain support. Obsolete products have limited or no future availability. For new designs or long-term production, select active products such as SN75C3221PWR, TRSF3221ECPWR, MAX3221EIPWR, or ICL3221CVZ.

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