SN65C3221DB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN65C3221DB is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-SSOP surface mount package. This device integrates one driver and one receiver for RS232 serial communication at data rates up to 1 Mbps. The part is classified as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts ensures design continuity and supply chain resilience for applications requiring RS232 interface functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65C3221DB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	1 Mbps
Voltage Supply Range	3V to 5.5V
Operating Temperature	-40°C to 85°C
Package / Case	16-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN65C3221DB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Protocol: RS232 full-duplex transceiver
Driver/Receiver Configuration: 1/1
Package: 16-SSOP surface mount
Voltage Supply: 3V to 5.5V
Operating Temperature Range: -40°C to 85°C minimum
RoHS3 Compliance

Acceptable Variations:

Data Rate: Substitute parts may operate at 250 kbps or higher (1 Mbps preferred but not mandatory)
Receiver Hysteresis: 300 mV or 500 mV acceptable
Moisture Sensitivity Level: MSL 1 or MSL 3 acceptable
Packaging Format: Tube or Cut Tape (CT) & Digi-Reel® acceptable

Substitute parts are grouped into three categories: Parametric Equivalents (identical electrical specifications), Direct Equivalents (minor parameter variations), and Manufacturer Recommended Alternatives (extended temperature or performance variants).

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Operating Temp	MSL	Product Status	Packaging
SN65C3221DB	Texas Instruments	1 Mbps	500 mV	-40°C to 85°C	1	Last Time Buy	Tube
MAX3227EIDB	Texas Instruments	1 Mbps	500 mV	-40°C to 85°C	1	Last Time Buy	Tube
TRS3227IDB	Texas Instruments	1 Mbps	500 mV	-40°C to 85°C	1	Last Time Buy	Tube
ICL3221EIAZ	Renesas Electronics	250 kbps	500 mV	-40°C to 85°C	3	Active	Tube
ICL3221EIAZ-T	Renesas Electronics	250 kbps	500 mV	-40°C to 85°C	3	Active	Cut Tape
ICL3221IAZ	Renesas Electronics	250 kbps	300 mV	-40°C to 85°C	3	Active	Tube
ICL3221IAZ-T	Renesas Electronics	250 kbps	300 mV	-40°C to 85°C	3	Active	Cut Tape
MAX3227EEAE+T	Analog Devices Inc./Maxim	1 Mbps	500 mV	-40°C to 85°C	1	Active	Cut Tape
ICL3221CAZ	Renesas Electronics	250 kbps	300 mV	0°C to 70°C	3	Active	Tube
ICL3221CAZ-T	Renesas Electronics	250 kbps	300 mV	0°C to 70°C	3	Active	Cut Tape
ICL3221ECAZ	Renesas Electronics	250 kbps	500 mV	0°C to 70°C	3	Active	Tube

Engineering Selection Recommendations

Parametric Equivalents (Highest Compatibility): MAX3227EIDB and TRS3227IDB are direct parametric equivalents to the SN65C3221DB, matching all electrical specifications and operating ranges. Both are classified as Last Time Buy, indicating similar supply constraints. MAX3227EIDB offers 2050 units in stock, while TRS3227IDB provides 982 units.

Active Status Alternatives (Recommended for New Designs): MAX3227EEAE+T (Analog Devices Inc./Maxim Integrated) is the preferred substitute for applications requiring extended component availability. This part maintains identical electrical performance (1 Mbps data rate, 500 mV hysteresis, -40°C to 85°C operation) and Active product status with 2100 units in stock. The Cut Tape packaging format accommodates both high-volume and prototype applications.

Extended Temperature Consideration: ICL3221EIAZ and ICL3221EIAZ-T (Renesas Electronics) support the full -40°C to 85°C operating range with Active product status. These parts operate at 250 kbps, which is acceptable for applications not requiring 1 Mbps throughput. Renesas offers 3410 units (tube) and 2105 units (cut tape) respectively.

Restricted Temperature Range: ICL3221CAZ, ICL3221CAZ-T, and ICL3221ECAZ are restricted to 0°C to 70°C operation and are suitable only for commercial-grade applications. These parts are not recommended for industrial or extended temperature environments.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SN65C3221DB with a part rated for 250 kbps instead of 1 Mbps? A: Yes, if your application operates at or below 250 kbps. The ICL3221 series from Renesas Electronics operates at 250 kbps and is fully compatible with the SN65C3221DB in all other parameters. Verify your actual data rate requirement before selection.

Q: What is the difference between ICL3221EIAZ and ICL3221IAZ? A: Both parts are identical except for receiver hysteresis: ICL3221EIAZ has 500 mV hysteresis (matching the SN65C3221DB), while ICL3221IAZ has 300 mV hysteresis. Select based on your noise immunity requirements.

Q: Are Cut Tape and Tube packaging electrically equivalent? A: Yes. Cut Tape (CT) & Digi-Reel® and Tube packaging contain identical die and electrical performance. Packaging format affects only handling, storage, and automated assembly compatibility. Select based on your manufacturing process requirements.

Q: Why do some substitutes have MSL 3 instead of MSL 1? A: MSL 3 (168 hours) indicates higher moisture sensitivity and requires stricter storage and handling protocols. MSL 1 (Unlimited) parts like the SN65C3221DB and MAX3227EEAE+T have no moisture sensitivity restrictions. Both are acceptable; MSL 3 parts require controlled humidity storage.

Q: Is the SN65C3221DB still available for new designs? A: The SN65C3221DB is classified as Last Time Buy, meaning Texas Instruments will discontinue production. For new designs, use MAX3227EEAE+T (Active status, Analog Devices Inc./Maxim) or ICL3221EIAZ (Active status, Renesas Electronics) to ensure long-term supply availability.

Q: Can I use ICL3221CAZ in a -40°C to 85°C application? A: No. ICL3221CAZ is rated only for 0°C to 70°C operation. For extended temperature applications, use ICL3221EIAZ, ICL3221IAZ, or MAX3227EEAE+T, all rated to -40°C to 85°C.

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