TRS3221CPWR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3221CPWR is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-TSSOP surface mount package. This component operates across a 3V to 5.5V supply range with a 250 kbps data rate and 500 mV receiver hysteresis. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS3221CPWR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250 kbps
Voltage Supply Range	3V to 5.5V
Operating Temperature	0°C to 70°C
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TRS3221CPWR is determined by strict equivalence across the following critical parameters:

Protocol: RS232 full-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Data Rate: 250 kbps minimum
Voltage Supply Range: 3V to 5.5V
Package / Case: 16-TSSOP or compatible footprint
Receiver Hysteresis: 500 mV or 300 mV (both acceptable for RS232 operation)
RoHS Compliance: ROHS3 Compliant
Mounting Type: Surface Mount

Substitute parts are grouped into three categories:

Parametric Equivalents maintain identical electrical specifications and package footprint, differing only in product status or manufacturer variant codes.

Upgrade Parts extend the operating temperature range beyond the original specification while maintaining all other electrical and mechanical parameters.

Manufacturer Recommended Parts provide functional equivalence with minor variations in receiver hysteresis or package dimensions that remain compatible with the original design intent.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Package	Receiver Hysteresis	Product Status
TRS3221CPWR	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	500 mV	Obsolete
MAX3221CPWR	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	500 mV	Active
MAX3221CPWRE4	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	500 mV	Discontinued at DiGi Electronics
MAX3221ECPWR	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	500 mV	Active
TRS3221ECPWR	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	500 mV	Active
MAX3221EEUE+	Analog Devices Inc./Maxim Integrated	RS232	1/1	250 kbps	3V–5.5V	−40°C–85°C	16-TSSOP	500 mV	Active
MAX3221EEUE+T	Analog Devices Inc./Maxim Integrated	RS232	1/1	250 kbps	3V–5.5V	−40°C–85°C	16-TSSOP	500 mV	Active
ICL3221CAZ	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-SSOP	300 mV	Active
ICL3221CAZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-SSOP	300 mV	Active
ICL3221CVZ	Intersil	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	300 mV	Active
ICL3221CVZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	16-TSSOP	300 mV	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MAX3221CPWR, MAX3221ECPWR, and TRS3221ECPWR are parametric equivalents with active product status. These parts maintain the original 16-TSSOP footprint, 500 mV receiver hysteresis, and 0°C to 70°C operating range. MAX3221CPWR and MAX3221ECPWR are manufactured by Texas Instruments with current availability.

For Extended Temperature Range Applications: MAX3221EEUE+ and MAX3221EEUE+T extend the operating temperature range to −40°C to 85°C while preserving all other electrical characteristics. These parts are manufactured by Analog Devices Inc./Maxim Integrated and carry active product status. Selection between the two depends on packaging preference: MAX3221EEUE+ is supplied in Tube packaging, while MAX3221EEUE+T is supplied in Cut Tape (CT) & Digi-Reel® format.

For Alternative Sourcing (Manufacturer Recommended): ICL3221CVZ-T (Renesas Electronics Corporation) and ICL3221CAZ-T (Renesas Electronics Corporation) provide functional equivalence with 300 mV receiver hysteresis. ICL3221CVZ-T maintains the 16-TSSOP footprint, while ICL3221CAZ-T uses a 16-SSOP package (0.209", 5.30mm Width). Both are active products with ROHS3 compliance and MSL 3 rating. The 300 mV hysteresis specification remains within RS232 protocol tolerances and does not compromise signal integrity for standard applications.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can MAX3221CPWR be used as a direct replacement for TRS3221CPWR? A: Yes. MAX3221CPWR is a parametric equivalent with identical electrical specifications (1/1 RS232 transceiver, 250 kbps, 3V–5.5V supply, 500 mV hysteresis, 16-TSSOP package) and active product status. The primary difference is manufacturer variant coding; both are manufactured by Texas Instruments.

Q: What is the difference between 500 mV and 300 mV receiver hysteresis? A: Receiver hysteresis defines the voltage difference between the rising and falling threshold levels. Both 500 mV and 300 mV specifications comply with RS232 protocol requirements. The 300 mV hysteresis in ICL3221 variants provides tighter threshold control and is suitable for standard RS232 applications without signal integrity concerns.

Q: Can ICL3221CAZ-T be used instead of ICL3221CVZ-T? A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is package type: ICL3221CAZ-T uses 16-SSOP (0.209", 5.30mm Width), while ICL3221CVZ-T uses 16-TSSOP (0.173", 4.40mm Width). PCB layout compatibility must be verified before substitution.

Q: Should I select MAX3221EEUE+T for applications requiring extended temperature range? A: MAX3221EEUE+T is appropriate for designs requiring operation from −40°C to 85°C. This part maintains all other electrical specifications identical to the original TRS3221CPWR. The +T suffix indicates Cut Tape (CT) & Digi-Reel® packaging format, suitable for automated assembly processes.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original TRS3221CPWR.

Q: What is the significance of MSL 1 versus MSL 3 rating? A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions; the component can be stored indefinitely without baking. MSL 3 (168 Hours) requires baking before reflow if the component has been exposed to moisture for more than 168 hours. ICL3221 variants carry MSL 3 rating and require standard moisture control procedures during assembly.

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