TRS3221CDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3221CDB is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-SSOP surface mount package. This interface IC operates across a 3V to 5.5V supply range with a 250 kbps data rate and 500 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS3221CDB
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
Receiver Hysteresis	500 mV
Package Type	16-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TRS3221CDB is determined by the following critical parameters:

Protocol: RS232 full-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Data Rate: 250 kbps minimum
Voltage Supply: 3V to 5.5V range
Package: 16-SSOP or 16-TSSOP surface mount
Receiver Hysteresis: 500 mV or 300 mV (both acceptable for RS232 applications)
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into three categories:

Direct Equivalent (Same Packaging): MAX3221CDBR maintains identical electrical specifications and 16-SSOP packaging with active product status and higher inventory availability.

Parametric Equivalent (Same Base Function): MAX3221CDB provides identical electrical performance in 16-SSOP packaging, though marked obsolete.

Upgraded Alternatives (Extended Temperature Range): MAX3221EEAE+ and MAX3221EEAE+T offer extended operating temperature (-40°C to 85°C) with active status, suitable for applications requiring wider temperature performance.

Manufacturer Recommended Alternatives: ICL3221 series (Renesas Electronics) and ICL3221CVZ (Intersil) provide full functional equivalence with alternative receiver hysteresis specifications (300 mV) and different package options (16-TSSOP).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status	Packaging Type
TRS3221CDB	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	500 mV	16-SSOP	Obsolete	Tube
MAX3221CDBR	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	500 mV	16-SSOP	Active	Tape & Reel
MAX3221CDB	Texas Instruments	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	500 mV	16-SSOP	Obsolete	Tube
MAX3221EEAE+	Analog Devices Inc./Maxim Integrated	RS232	1/1	250 kbps	3V–5.5V	-40°C–85°C	500 mV	16-SSOP	Active	Tube
MAX3221EEAE+T	Analog Devices Inc./Maxim Integrated	RS232	1/1	250 kbps	3V–5.5V	-40°C–85°C	500 mV	16-SSOP	Active	Cut Tape & Digi-Reel
ICL3221CAZ	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	300 mV	16-SSOP	Active	Tube
ICL3221CAZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	300 mV	16-SSOP	Active	Cut Tape & Digi-Reel
ICL3221CVZ	Intersil	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	300 mV	16-TSSOP	Active	Bulk
ICL3221CVZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	300 mV	16-TSSOP	Active	Cut Tape & Digi-Reel
ICL3221ECAZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	500 mV	16-SSOP	Active	Tape & Reel
ICL3221ECVZ	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V–5.5V	0°C–70°C	500 mV	16-TSSOP	Active	Tube

Engineering Selection Recommendations

Primary Recommendation: MAX3221CDBR is the direct equivalent with active product status, identical electrical specifications, and superior inventory availability (35,200 units). This part maintains the 16-SSOP package footprint and 500 mV receiver hysteresis of the original TRS3221CDB.

Extended Temperature Applications: MAX3221EEAE+ or MAX3221EEAE+T are suitable for designs requiring operation beyond the standard 0°C to 70°C range, extending to -40°C to 85°C. Both maintain active status and ROHS3 compliance.

Alternative Manufacturer Options: ICL3221 series from Renesas Electronics provides full functional equivalence with active product status. ICL3221ECAZ-T and ICL3221ECVZ maintain the 500 mV receiver hysteresis specification. ICL3221CAZ and ICL3221CAZ-T feature 300 mV hysteresis, which remains compatible with RS232 protocol requirements.

Package Considerations: Parts designated with 16-TSSOP (ICL3221CVZ, ICL3221CVZ-T, ICL3221ECVZ) have a narrower body width (4.40mm vs. 5.30mm) and require PCB layout verification before substitution.

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can MAX3221CDBR be used as a direct replacement for TRS3221CDB?

A: Yes. MAX3221CDBR is electrically and functionally identical to TRS3221CDB with matching 16-SSOP packaging, 500 mV receiver hysteresis, and 250 kbps data rate. The primary difference is active product status and packaging format (Tape & Reel vs. Tube).

Q: What is the difference between 500 mV and 300 mV receiver hysteresis?

A: Receiver hysteresis defines the voltage difference between rising and falling threshold levels. Both 500 mV and 300 mV specifications are valid for RS232 transceiver operation. The 300 mV hysteresis in ICL3221 series provides tighter threshold control, while 500 mV offers greater noise immunity. Selection depends on application noise environment.

Q: Are 16-SSOP and 16-TSSOP packages interchangeable?

A: No. While both are 16-pin surface mount packages, 16-SSOP has a 5.30mm body width and 16-TSSOP has a 4.40mm body width. PCB footprints are different and not compatible. Verify footprint requirements before selecting ICL3221CVZ or ICL3221ECVZ variants.

Q: Why should I choose MAX3221EEAE+ over MAX3221CDBR?

A: MAX3221EEAE+ extends the operating temperature range to -40°C to 85°C, compared to 0°C to 70°C for MAX3221CDBR. Select the extended-temperature variant only if your application requires operation outside the standard industrial temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original TRS3221CDB specification.

Q: What inventory considerations apply to these substitutes?

A: MAX3221CDBR offers the highest inventory availability (35,200 units). MAX3221EEAE+T provides 25,100 units. Renesas ICL3221 variants range from 1,460 to 5,400 units. Verify supplier stock levels for production volume requirements.

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