TRS3221ECDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3221ECDB is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-SSOP surface mount package. This part operates across a 3V to 5.5V supply range with a 250 kbps data rate and 500 mV receiver hysteresis. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS3221ECDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Drivers/Receivers	1/1
Duplex	Full
Data Rate	250 kbps
Voltage Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	500 mV
Package / Case	16-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TRS3221ECDB is determined by the following critical parameters:

Protocol & Functionality: RS232 full-duplex transceiver with 1 driver and 1 receiver
Electrical Specifications: 250 kbps data rate, 3V to 5.5V supply voltage, 500 mV receiver hysteresis
Package Compatibility: 16-SSOP surface mount package (0.209", 5.30mm width)
Operating Temperature Range: 0°C to 70°C minimum requirement
Compliance: ROHS3 compliant, REACH unaffected

Substitute parts are grouped into three categories:

Parametric Equivalent: MAX3221CDB matches all electrical and mechanical specifications identically, with identical package and operating parameters.

Upgrade Options: MAX3221EEAE+ and MAX3221EEAE+T offer extended operating temperature range (-40°C to 85°C) while maintaining all other specifications. These parts carry active product status.

Manufacturer Recommended Alternatives: ICL3221 series (Renesas Electronics) and ICL3221CVZ (Intersil) provide functional equivalence with minor parameter variations. ICL3221CAZ and ICL3221CAZ-T feature 300 mV receiver hysteresis. ICL3221CVZ and ICL3221CVZ-T use 16-TSSOP package (0.173", 4.40mm width). ICL3221ECAZ-T, ICL3221ECVZ, and ICL3221ECVZ-T maintain 500 mV hysteresis with active product status.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status
TRS3221ECDB	Texas Instruments	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Obsolete
MAX3221CDB	Texas Instruments	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Obsolete
MAX3221EEAE+	Analog Devices Inc./Maxim Integrated	RS232	1/1	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	16-SSOP	Active
MAX3221EEAE+T	Analog Devices Inc./Maxim Integrated	RS232	1/1	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	16-SSOP	Active
ICL3221CAZ	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	16-SSOP	Active
ICL3221CAZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	16-SSOP	Active
ICL3221CVZ	Intersil	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	16-TSSOP	Active
ICL3221CVZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	16-TSSOP	Active
ICL3221ECAZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Active
ICL3221ECVZ	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-TSSOP	Active
ICL3221ECVZ-T	Renesas Electronics Corporation	RS232	1/1	250 kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-TSSOP	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications)

MAX3221CDB is the direct parametric equivalent to TRS3221ECDB. Both parts are obsolete but share identical electrical, thermal, and mechanical specifications. This substitution requires no design modifications.

Recommended Upgrade Path

MAX3221EEAE+ and MAX3221EEAE+T are preferred for new designs and long-term support. Both maintain full electrical compatibility while offering extended operating temperature range (-40°C to 85°C) and active product status. MAX3221EEAE+T provides Cut Tape and Digi-Reel packaging with higher inventory availability (25,100 units).

Active Alternatives with Package Compatibility

ICL3221ECAZ-T (Renesas Electronics) provides 16-SSOP package compatibility with 500 mV receiver hysteresis, matching the original TRS3221ECDB specifications exactly. This part carries active product status and ROHS3 compliance.

Package Variant Substitutes

ICL3221CVZ-T and ICL3221ECVZ-T use 16-TSSOP packaging (0.173", 4.40mm width) instead of 16-SSOP. These substitutes are suitable only if PCB layout accommodates the narrower package footprint. ICL3221ECVZ-T maintains 500 mV hysteresis; ICL3221CVZ-T features 300 mV hysteresis.

Hysteresis Consideration

ICL3221CAZ, ICL3221CAZ-T, ICL3221CVZ, and ICL3221CVZ-T feature 300 mV receiver hysteresis compared to the original 500 mV specification. These parts are functionally compatible but exhibit different input threshold characteristics. Selection depends on system noise immunity requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX3221EEAE+ directly replace TRS3221ECDB without PCB modifications?

A: Yes. MAX3221EEAE+ maintains identical 16-SSOP package dimensions, pin configuration, and electrical specifications. The extended operating temperature range (-40°C to 85°C) provides additional capability without requiring design changes.

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

A: Receiver hysteresis defines the voltage difference between rising and falling input thresholds. Higher hysteresis (500 mV) provides greater noise immunity in electrically noisy environments. Lower hysteresis (300 mV) allows faster signal transitions. Selection depends on system noise characteristics and signal integrity requirements.

Q: Are ICL3221CVZ and ICL3221CVZ-T pin-compatible with TRS3221ECDB?

A: Both parts are functionally equivalent RS232 transceivers with identical pin counts and signal assignments. However, they use 16-TSSOP packaging (0.173" width) instead of 16-SSOP (0.209" width). PCB footprints differ and are not interchangeable without layout redesign.

Q: Which substitute offers the best long-term availability?

A: MAX3221EEAE+T carries active product status with 25,100 units in stock and Cut Tape/Digi-Reel packaging. This part is recommended for designs requiring extended production support and component availability.

Q: Do all substitutes maintain ROHS3 compliance?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the original TRS3221ECDB environmental certifications.

Q: What packaging options are available for active substitutes?

A: MAX3221EEAE+ is supplied in Tube packaging. MAX3221EEAE+T is supplied in Cut Tape and Digi-Reel format. ICL3221 series parts are available in Tube, Cut Tape, and Tape & Reel packaging options depending on specific part number suffix.

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