SN65C3222DBR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN65C3222DBR is a full-duplex RS232 transceiver manufactured by Texas Instruments, configured with 2 drivers and 2 receivers in a 20-SSOP surface mount package. This device operates across a 3V to 5.5V supply range and supports data rates up to 1 Mbps with a 300 mV receiver hysteresis specification. The part is designated as Last Time Buy status, indicating limited future availability. Equivalent and substitute parts are necessary to ensure design continuity and procurement flexibility for applications requiring RS232 interface functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65C3222DBR
Manufacturer	Texas Instruments
Category	Interface
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Data Rate	1 Mbps
Voltage Supply Range	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Receiver Hysteresis	300 mV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution of RS232 transceiver parts is determined by strict alignment of the following parameters:

Protocol: RS232 (mandatory)
Number of Drivers/Receivers: 2/2 (mandatory)
Duplex: Full (mandatory)
Voltage Supply Range: 3V ~ 5.5V (mandatory)
Operating Temperature: -40°C ~ 85°C (mandatory)
Package / Case: 20-SSOP or 20-TSSOP (compatible surface mount packages)
Mounting Type: Surface Mount (mandatory)
RoHS Status: ROHS3 Compliant or RoHS Compliant (mandatory)

Substitute parts are grouped into three categories based on their relationship to the main part:

MFR Recommended Substitutes: Parts recommended by the original manufacturer as direct replacements, maintaining identical or superior electrical specifications.

Parametric Equivalents: Parts with identical core electrical parameters and package compatibility, sourced from the same or alternative manufacturers.

Direct Alternatives: Parts meeting all mandatory substitution criteria with variations in secondary parameters such as data rate or receiver hysteresis, suitable for applications where these variations do not impact system performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Package	Voltage Supply	Operating Temp	Product Status	RoHS Status	Inventory
SN65C3222DBR	Texas Instruments	RS232	2/2	1 Mbps	300 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Last Time Buy	ROHS3	6120 Pcs
TRSF3222EIPWR	Texas Instruments	RS232	2/2	500 kbps	300 mV	20-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	2780 Pcs
SN65C3222EDBR	Texas Instruments	RS232	2/2	1 Mbps	300 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Last Time Buy	ROHS3	5160 Pcs
MAX3222EEAP+	Analog Devices Inc./Maxim Integrated	RS232	2/2	1 Mbps	500 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	2720 Pcs
MAX3222EEAP+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	1 Mbps	500 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	6900 Pcs
SP3222EBEA-L/TR	MaxLinear, Inc.	RS232	2/2	250 kbps	300 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	RoHS	3756 Pcs
ST3222EBPR	STMicroelectronics	RS232	2/2	250 kbps	500 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	17100 Pcs
ICL3222EIAZ	Renesas Electronics Corporation	RS232	2/2	250 kbps	500 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	1446 Pcs
ICL3222EIAZ-T	Renesas Electronics Corporation	RS232	2/2	250 kbps	500 mV	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	6067 Pcs
ICL3222EIVZ	Renesas Electronics Corporation	RS232	2/2	250 kbps	500 mV	20-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	1541 Pcs
ICL3222EIVZ-T	Renesas Electronics Corporation	RS232	2/2	250 kbps	500 mV	20-TSSOP	3V ~ 5.5V	-40°C ~ 85°C	Active	ROHS3	6050 Pcs

Engineering Selection Recommendations

Primary Recommendation for 20-SSOP Package Continuity:

SN65C3222EDBR (Texas Instruments) maintains identical electrical specifications to the main part, including 1 Mbps data rate and 300 mV receiver hysteresis, with the same 20-SSOP package footprint. This part is designated Active status, ensuring continued availability compared to the Last Time Buy status of SN65C3222DBR.

Alternative for Active Product Status with Identical Performance:

MAX3222EEAP+T (Analog Devices Inc./Maxim Integrated) provides 1 Mbps data rate performance in the same 20-SSOP package with Active product status and ROHS3 compliance. The 500 mV receiver hysteresis specification exceeds the main part requirement and does not impact compatibility in standard RS232 applications.

Package-Compatible Alternative (20-TSSOP):

TRSF3222EIPWR (Texas Instruments) offers Active product status in a 20-TSSOP package with reduced width (4.40mm vs. 5.30mm). This part is suitable for space-constrained PCB layouts. The 500 kbps data rate is lower than the main part specification and must be evaluated against application bandwidth requirements.

High-Inventory Alternative:

ST3222EBPR (STMicroelectronics) provides the highest current inventory (17,100 Pcs) with Active product status and ROHS3 compliance. The 250 kbps data rate and 500 mV receiver hysteresis are suitable for lower-speed RS232 applications.

Renesas Electronics Options:

ICL3222EIAZ-T and ICL3222EIVZ-T (Renesas Electronics Corporation) offer Active product status with ROHS3 compliance. The 20-SSOP variant (ICL3222EIAZ-T) maintains the original package footprint, while the 20-TSSOP variant (ICL3222EIVZ-T) provides a narrower package option. Both support 250 kbps data rate.

Frequently Asked Questions (FAQ)

Q: Can SN65C3222EDBR directly replace SN65C3222DBR without PCB modifications?

A: Yes. SN65C3222EDBR is a parametric equivalent with identical electrical specifications (1 Mbps data rate, 300 mV receiver hysteresis) and the same 20-SSOP package footprint. No PCB layout changes are required.

Q: What is the impact of using a substitute part with lower data rate specification?

A: Parts with lower data rate specifications (such as 250 kbps or 500 kbps variants) are suitable only for applications operating below their rated data rate. If your application requires 1 Mbps operation, select parts with 1 Mbps or higher data rate ratings.

Q: Are 20-SSOP and 20-TSSOP packages pin-compatible?

A: Both packages are 20-pin surface mount packages with identical pin assignments for RS232 transceiver functions. However, the 20-TSSOP package has a reduced width (4.40mm vs. 5.30mm). PCB footprint verification is required before substitution to ensure mechanical fit.

Q: What does Last Time Buy status mean for the SN65C3222DBR?

A: Last Time Buy status indicates that the manufacturer will discontinue this part after a specified date. Existing inventory will not be replenished. Active status alternatives should be selected for new designs or long-term production requirements.

Q: Does receiver hysteresis variation affect RS232 compatibility?

A: Receiver hysteresis determines the voltage differential required for input signal transitions. The SN65C3222DBR specifies 300 mV, while many substitutes specify 500 mV. Higher hysteresis values provide improved noise immunity and do not compromise compatibility with standard RS232 signal levels.

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

A: Parts with Active product status and highest current inventory provide the best long-term availability. MAX3222EEAP+T (6,900 Pcs) and ST3222EBPR (17,100 Pcs) are recommended for designs requiring extended production support.

Q: Are all listed substitute parts ROHS3 compliant?

A: All substitute parts listed are either ROHS3 Compliant or RoHS Compliant. SP3222EBEA-L/TR carries RoHS Compliant status. Verify specific compliance requirements for your application and regional regulations.

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