ICL3221CA-T RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The ICL3221CA-T is a full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation, designed for single driver/receiver interface applications. This part operates across a 3V to 5.5V supply range with a 250kbps data rate and 300mV receiver hysteresis. The ICL3221CA-T is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain core RS232 transceiver functionality while offering improved product status, compliance certifications, and availability.

Key Parameters

Parameter	ICL3221CA-T
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250kbps
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	300mV
Package / Case	16-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the ICL3221CA-T is determined by strict adherence to the following electrical and mechanical parameters:

Core Compatibility Requirements:

Protocol: RS232 full-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Package / Case: 16-SSOP (0.209", 5.30mm Width)
Voltage Supply Range: 3V ~ 5.5V
Mounting Type: Surface Mount
Operating Temperature: 0°C ~ 70°C minimum (extended range acceptable)

Acceptable Parameter Variations:

Data Rate: 250kbps or higher (backward compatible)
Receiver Hysteresis: 300mV or higher (acceptable tolerance variation)
Product Status: Active or Last Time Buy preferred over Obsolete
RoHS Compliance: ROHS3 Compliant preferred for new designs

Substitute parts are grouped into three categories: parametric equivalents (identical electrical specifications), direct substitutes (compatible with minor parameter enhancements), and upgrades (extended operating temperature range).

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Operating Temperature	Product Status	RoHS Status	Inventory (Pcs)
ICL3221CA-T	Renesas	250kbps	300mV	0°C ~ 70°C	Obsolete	RoHS non-compliant	54600
ICL3221CAZ-T	Renesas	250kbps	300mV	0°C ~ 70°C	Active	ROHS3 Compliant	5400
MAX3221CDBR	Texas Instruments	250kbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	35200
MAX3227ECAE+	Analog Devices Inc./Maxim Integrated	1Mbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	1900
MAX3227ECAE+T	Analog Devices Inc./Maxim Integrated	1Mbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	3100
SN75C3221DBR	Texas Instruments	1Mbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	3650
TRSF3221CDBR	Texas Instruments	1Mbps	500mV	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant	1410
TRSF3221ECDB	Texas Instruments	1Mbps	500mV	0°C ~ 70°C	Last Time Buy	ROHS3 Compliant	1480
TRSF3221ECDBR	Texas Instruments	1Mbps	500mV	0°C ~ 70°C	Active	ROHS3 Compliant	1600
SN65C3221DB	Texas Instruments	1Mbps	500mV	-40°C ~ 85°C	Last Time Buy	ROHS3 Compliant	1180
SN65C3221DBR	Texas Instruments	1Mbps	500mV	-40°C ~ 85°C	Obsolete	ROHS3 Compliant	2100

Engineering Selection Recommendations

Parametric Equivalent (Recommended for Direct Replacement): ICL3221CAZ-T is the primary equivalent, maintaining identical electrical specifications (250kbps data rate, 300mV receiver hysteresis) while offering Active product status and ROHS3 compliance. This part is the preferred choice for designs requiring exact parameter matching with improved lifecycle support.

Direct Substitutes (Compatible with Enhanced Performance): MAX3221CDBR, MAX3227ECAE+, MAX3227ECAE+T, SN75C3221DBR, TRSF3221CDBR, TRSF3221ECDB, and TRSF3221ECDBR all maintain the required 1/1 transceiver configuration, 16-SSOP package, and 3V to 5.5V supply range. These parts feature higher data rates (250kbps to 1Mbps) and increased receiver hysteresis (500mV), providing backward compatibility with improved performance margins. All direct substitutes carry ROHS3 compliance and Active or Last Time Buy status.

Upgrade Options (Extended Temperature Range): SN65C3221DB and SN65C3221DBR extend the operating temperature range to -40°C to 85°C, suitable for industrial and automotive applications requiring wider temperature specifications. These upgrades maintain all core RS232 transceiver functionality while providing enhanced environmental performance.

Compliance and Availability Considerations: All substitute parts listed carry ROHS3 compliance, addressing the RoHS non-compliant status of the obsolete ICL3221CA-T. MAX3221CDBR and TRSF3221ECDBR offer the highest inventory availability (35200 and 1600 units respectively), supporting volume production requirements. Parts with Last Time Buy status (TRSF3221CDBR, TRSF3221ECDB, SN65C3221DB, SN65C3221DBR) should be evaluated for long-term supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can ICL3221CAZ-T directly replace ICL3221CA-T without circuit modifications? A: Yes. ICL3221CAZ-T is a parametric equivalent with identical electrical specifications (250kbps data rate, 300mV receiver hysteresis, 1/1 transceiver configuration) and identical 16-SSOP package. The only differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the impact of using a substitute with 500mV receiver hysteresis instead of 300mV? A: Increased receiver hysteresis (500mV vs. 300mV) provides a wider noise margin during signal transitions, improving noise immunity. This is a beneficial parameter enhancement that maintains backward compatibility. Designs operating within the original 300mV specification will function correctly with 500mV hysteresis parts.

Q: Are higher data rate substitutes (1Mbps vs. 250kbps) backward compatible? A: Yes. Parts rated for 1Mbps data rate are backward compatible with designs operating at 250kbps. The higher data rate specification indicates enhanced performance capability without affecting lower-speed operation. All electrical and mechanical parameters remain compatible.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Tube. All maintain the identical 16-SSOP (0.209", 5.30mm Width) surface mount package. Packaging selection depends on production volume and handling requirements.

Q: Should I select an upgrade part with extended temperature range (-40°C to 85°C)? A: Upgrade selection depends on application requirements. If your design operates within the original 0°C to 70°C range, standard substitutes are appropriate. Extended temperature range upgrades (SN65C3221DB, SN65C3221DBR) are necessary only for industrial, automotive, or harsh environment applications requiring -40°C to 85°C operation.

Q: What is the significance of Last Time Buy status for TRSF3221 and SN65C3221 parts? A: Last Time Buy status indicates these parts are in the final production phase before discontinuation. While currently available, long-term supply cannot be guaranteed. For new designs or extended production runs, Active status parts (ICL3221CAZ-T, MAX3221CDBR, TRSF3221ECDBR) are recommended for supply chain stability.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed carry ROHS3 compliance, addressing the RoHS non-compliant status of the obsolete ICL3221CA-T. This compliance is mandatory for most commercial and industrial applications.

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