TRS3221IPW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRS3221IPW is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-TSSOP 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 continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRS3221IPW
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250 kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Receiver Hysteresis	500 mV
Mounting Type	Surface Mount
Package / Case	16-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TRS3221IPW 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 Range: 3V ~ 5.5V
Mounting Type: Surface Mount
Package Compatibility: 16-TSSOP or 16-SSOP form factors

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications and package form factor (16-TSSOP), ensuring direct pin-for-pin compatibility.

Manufacturer Recommended Substitutes are active production parts from Renesas Electronics Corporation and Intersil that meet the core functional requirements. These parts may have minor variations in receiver hysteresis (300 mV vs. 500 mV) or operating temperature ranges (0°C ~ 70°C vs. -40°C ~ 85°C), but remain functionally compatible for standard RS232 communication applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Receiver Hysteresis	Operating Temperature	Voltage Supply	Data Rate
TRS3221IPW	Texas Instruments	Obsolete	16-TSSOP	500 mV	-40°C ~ 85°C	3V ~ 5.5V	250 kbps
MAX3221IPWG4	Texas Instruments	Obsolete	16-TSSOP	500 mV	-40°C ~ 85°C	3V ~ 5.5V	250 kbps
TRS3221EIPW	Texas Instruments	Obsolete	16-TSSOP	500 mV	-40°C ~ 85°C	3V ~ 5.5V	250 kbps
ICL3221CAZ	Renesas Electronics Corporation	Active	16-SSOP	300 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221CAZ-T	Renesas Electronics Corporation	Active	16-SSOP	300 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221CVZ	Intersil	Active	16-TSSOP	300 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221CVZ-T	Renesas Electronics Corporation	Active	16-TSSOP	300 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221ECAZ	Renesas Electronics Corporation	Active	16-SSOP	500 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221ECAZ-T	Renesas Electronics Corporation	Active	16-SSOP	500 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221ECVZ	Renesas Electronics Corporation	Active	16-TSSOP	500 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps
ICL3221ECVZ-T	Renesas Electronics Corporation	Active	16-TSSOP	500 mV	0°C ~ 70°C	3V ~ 5.5V	250 kbps

Engineering Selection Recommendations

Direct Pin-for-Pin Replacement (Preferred)

For applications requiring identical electrical performance and package compatibility, MAX3221IPWG4 and TRS3221EIPW are direct substitutes. Both maintain the 16-TSSOP package, 500 mV receiver hysteresis, and -40°C to 85°C operating temperature range. These parts are classified as obsolete but remain available in inventory.

Active Production Alternatives

For new designs or long-term procurement, Renesas Electronics Corporation ICL3221 series parts are recommended. ICL3221ECVZ and ICL3221ECVZ-T provide the closest electrical match with 500 mV receiver hysteresis and 16-TSSOP packaging. Both are active production parts with ROHS3 compliance and full regulatory certification (REACH Unaffected, EAR99).

ICL3221CVZ-T offers 16-TSSOP packaging with active production status, though receiver hysteresis is reduced to 300 mV. This reduction does not impact standard RS232 communication but may affect noise margin in electrically noisy environments.

For applications tolerating reduced operating temperature range (0°C to 70°C), ICL3221CAZ and ICL3221CAZ-T provide 16-SSOP packaging with active production status and full inventory availability.

All recommended substitutes maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification, ensuring regulatory continuity.

Frequently Asked Questions (FAQ)

Q: Can I use ICL3221CVZ-T as a direct replacement for TRS3221IPW?

A: ICL3221CVZ-T is functionally compatible but not a direct pin-for-pin replacement. Both use 16-TSSOP packaging and support RS232 full-duplex communication at 250 kbps with 3V to 5.5V supply. The primary difference is receiver hysteresis: ICL3221CVZ-T specifies 300 mV versus TRS3221IPW's 500 mV. For standard RS232 applications, this difference is acceptable. However, if your design relies on the higher hysteresis specification for noise immunity, ICL3221ECVZ or ICL3221ECVZ-T are preferred.

Q: What is the difference between 16-TSSOP and 16-SSOP packages?

A: Both are 16-pin surface mount packages with different pitch and width specifications. 16-TSSOP measures 0.173" (4.40mm) width, while 16-SSOP measures 0.209" (5.30mm) width. These packages are not mechanically interchangeable on the same PCB footprint. Verify your board layout before selecting a substitute with a different package designation.

Q: Why do some substitutes have a narrower operating temperature range?

A: ICL3221 series parts from Renesas specify 0°C to 70°C operating temperature, compared to TRS3221IPW's -40°C to 85°C range. This reflects different qualification and testing standards between manufacturers. For applications requiring extended temperature operation below 0°C or above 70°C, select parts with matching temperature specifications: MAX3221IPWG4, TRS3221EIPW, ICL3221ECVZ, or ICL3221ECVZ-T.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification and REACH Unaffected status, ensuring regulatory compliance for EU and international markets.

Q: What packaging options are available for active production parts?

A: Renesas Electronics Corporation ICL3221 series parts are available in multiple packaging formats: Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR). Intersil ICL3221CVZ is supplied in Bulk packaging. Select packaging based on your procurement volume and assembly requirements.

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