SN75C3221PW RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN75C3221PW is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-TSSOP surface mount package. This part operates across a 3V to 5.5V supply range with a 1Mbps data rate and 500mV receiver hysteresis. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain functional compatibility while offering improved availability and extended operating temperature ranges in active product status.

Key Parameters

Parameter	Value
Part Number	SN75C3221PW
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	RS232
Configuration	1/1 (1 Driver, 1 Receiver)
Duplex	Full
Package	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage Supply	3V ~ 5.5V
Data Rate	1Mbps
Receiver Hysteresis	500mV
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN75C3221PW is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232
Configuration: 1/1 (1 Driver, 1 Receiver)
Duplex: Full
Package: 16-TSSOP
Mounting Type: Surface Mount
Voltage Supply Range: 3V ~ 5.5V (minimum overlap required)

Secondary Performance Parameters:

Data Rate: Minimum 1Mbps (substitute must meet or exceed)
Receiver Hysteresis: 500mV preferred; 300mV acceptable with functional equivalence
Operating Temperature: Extended ranges (-40°C ~ 85°C) provide broader application support

Substitute parts are grouped into three categories: direct equivalents (matching all primary criteria), functional equivalents (meeting primary criteria with minor performance variations), and upgraded alternatives (extended temperature range with enhanced availability).

Parameter Comparison

Part Number	Manufacturer	Protocol	Config	Data Rate	Hysteresis	Temp Range	Package	Status	Inventory
SN75C3221PW	Texas Instruments	RS232	1/1	1Mbps	500mV	0°C ~ 70°C	16-TSSOP	Obsolete	739
SN65C3221PWR	Texas Instruments	RS232	1/1	1Mbps	500mV	-40°C ~ 85°C	16-TSSOP	Active	2547
ICL3221CVZ	Intersil	RS232	1/1	250kbps	300mV	0°C ~ 70°C	16-TSSOP	Active	1978
ICL3221CVZ-T	Renesas Electronics	RS232	1/1	250kbps	300mV	0°C ~ 70°C	16-TSSOP	Active	3460
ICL3221ECVZ	Renesas Electronics	RS232	1/1	250kbps	500mV	0°C ~ 70°C	16-TSSOP	Active	1460
ICL3221ECVZ-T	Renesas Electronics	RS232	1/1	250kbps	500mV	0°C ~ 70°C	16-TSSOP	Active	1659
ICL3221EIVZ	Renesas Electronics	RS232	1/1	250kbps	500mV	-40°C ~ 85°C	16-TSSOP	Active	888900
ICL3221EIVZ-T	Renesas Electronics	RS232	1/1	250kbps	500mV	-40°C ~ 85°C	16-TSSOP	Active	10300
MAX3221CUE+	Analog Devices/Maxim	RS232	1/1	235kbps	300mV	0°C ~ 70°C	16-TSSOP	Active	2122
MAX3221CUE+T	Analog Devices/Maxim	RS232	1/1	235kbps	300mV	0°C ~ 70°C	16-TSSOP	Active	10200
MAX3221EUE+	Analog Devices/Maxim	RS232	1/1	250kbps	500mV	-40°C ~ 85°C	16-TSSOP	Active	2240

Engineering Selection Recommendations

Primary Recommendation: SN65C3221PWR

The SN65C3221PWR is the direct Texas Instruments equivalent with identical electrical specifications to the SN75C3221PW. It maintains the same 1Mbps data rate, 500mV receiver hysteresis, and 16-TSSOP package footprint. The primary advantage is extended operating temperature range (-40°C to 85°C) and active product status with 2547 units in stock. This part is suitable for direct replacement in existing designs without circuit modification.

Secondary Recommendation: ICL3221EIVZ or ICL3221EIVZ-T

The Renesas ICL3221EIVZ series provides extended temperature operation (-40°C to 85°C) with 500mV receiver hysteresis matching the original specification. Data rate is specified at 250kbps, which is below the original 1Mbps but remains functional for standard RS232 communication. The ICL3221EIVZ-T variant in cut tape packaging offers the highest inventory availability (10,300 units). These parts are suitable for applications requiring extended temperature range operation.

Alternative Recommendation: MAX3221EUE+

The Analog Devices MAX3221EUE+ provides extended temperature operation (-40°C to 85°C) with 500mV receiver hysteresis and 250kbps data rate. This part is manufacturer-recommended and carries active product status with ROHS3 compliance. It is suitable for designs where extended temperature performance is required.

Functional Equivalent: ICL3221CVZ-T

The Renesas ICL3221CVZ-T operates within the original 0°C to 70°C temperature range with 300mV receiver hysteresis and 250kbps data rate. This part is suitable for applications where the original temperature range is acceptable and lower hysteresis is compatible with system design.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can the SN65C3221PWR directly replace the SN75C3221PW?

A: Yes. The SN65C3221PWR is electrically and mechanically equivalent to the SN75C3221PW. Both parts share identical RS232 protocol, 1/1 configuration, 1Mbps data rate, 500mV receiver hysteresis, and 16-TSSOP package. The SN65C3221PWR offers extended operating temperature range (-40°C to 85°C) and active product status.

Q: What is the difference between ICL3221ECVZ and ICL3221EIVZ?

A: Both parts are Renesas RS232 transceivers in 16-TSSOP packages with 500mV receiver hysteresis. The primary difference is operating temperature range: ICL3221ECVZ operates 0°C to 70°C, while ICL3221EIVZ operates -40°C to 85°C. The extended temperature variant (EIVZ) is suitable for industrial and automotive applications.

Q: Why do some substitutes have lower data rates (250kbps vs. 1Mbps)?

A: The SN75C3221PW specifies 1Mbps maximum data rate. Substitute parts from Renesas (ICL3221 series) and Analog Devices (MAX3221 series) specify 250kbps or 235kbps. These lower ratings reflect conservative manufacturer specifications; RS232 protocol operation at these data rates is functionally compatible with the original part. System performance depends on actual communication requirements, not maximum rated specifications.

Q: What is the difference between tube and cut tape packaging?

A: Tube packaging (e.g., SN75C3221PW, ICL3221ECVZ) is used for lower-volume orders and manual assembly. Cut tape and Digi-Reel packaging (e.g., SN65C3221PWR, ICL3221CVZ-T) is used for automated pick-and-place assembly and higher-volume production. Electrical specifications are identical; packaging choice depends on assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory compliance of the original SN75C3221PW.

Q: Which substitute offers the best inventory availability?

A: The ICL3221EIVZ provides the highest inventory with 888,900 units in stock. The ICL3221EIVZ-T (cut tape variant) offers 10,300 units. Both parts provide extended temperature operation (-40°C to 85°C) with 500mV receiver hysteresis.

Q: Can I use MAX3221CUE+ as a substitute?

A: The MAX3221CUE+ is functionally compatible for standard RS232 applications. It operates within the 0°C to 70°C temperature range with 300mV receiver hysteresis and 235kbps data rate. This part is suitable if your application does not require extended temperature operation or the higher hysteresis specification of the original part.

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