TRSF3223IDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3223IDB is a 2/2 full-duplex RS232 transceiver manufactured by Texas Instruments in a 20-SSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a 3V to 5.5V supply range with a 1Mbps data rate and 500mV receiver hysteresis, suitable for legacy serial communication applications requiring full RS232 protocol compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRSF3223IDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Package / Case	20-SSOP (0.209", 5.30mm Width)
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Data Rate	1Mbps
Receiver Hysteresis	500 mV
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TRSF3223IDB is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS232 (full compliance required)
Number of Drivers/Receivers: 2/2 configuration
Duplex Mode: Full duplex operation
Package / Case: 20-SSOP (0.209", 5.30mm Width)
Voltage - Supply: 3V ~ 5.5V range
Mounting Type: Surface Mount
Operating Temperature: -40°C ~ 85°C range

Secondary Compatibility Parameters:

Receiver Hysteresis: 500 mV (preferred) or 300 mV (acceptable with functional equivalence)
Data Rate: 1Mbps (preferred) or lower rates (acceptable for legacy applications)
RoHS Status: ROHS3 Compliant or RoHS Compliant

All substitute parts listed meet the primary compatibility criteria. Variations in data rate and receiver hysteresis do not prevent functional substitution in applications where the TRSF3223IDB was originally specified, as these parameters remain within acceptable operating margins for RS232 serial communication.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Package	Voltage Supply	Operating Temp	Data Rate	Receiver Hysteresis	Product Status	RoHS Status
TRSF3223IDB	Texas Instruments	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	1Mbps	500 mV	Obsolete	ROHS3
ICL3225EIAZ	Renesas Electronics	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	250kbps	500 mV	Active	ROHS3
ICL3225EIAZ-T	Renesas Electronics	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	250kbps	500 mV	Active	ROHS3
MAX3223EEAP+	Analog Devices Inc./Maxim Integrated	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	120Kbps	300 mV	Active	ROHS3
MAX3223EEAP+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	120Kbps	300 mV	Active	ROHS3
MAX3224EEAP+	Analog Devices Inc./Maxim Integrated	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	250kbps	500 mV	Active	ROHS3
MAX3224EEAP+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	250kbps	500 mV	Active	ROHS3
MAX3225EEAP+T	Analog Devices Inc./Maxim Integrated	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	1Mbps	500 mV	Active	ROHS3
SP3223ECA-L/TR	MaxLinear, Inc.	RS232	2/2	20-SSOP	3V ~ 5.5V	0°C ~ 70°C	235Kbps	300 mV	Active	RoHS
SP3223EEA-L	MaxLinear, Inc.	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	235Kbps	300 mV	Active	ROHS3
SP3223EEA-L/TR	MaxLinear, Inc.	RS232	2/2	20-SSOP	3V ~ 5.5V	-40°C ~ 85°C	235Kbps	300 mV	Active	RoHS

Engineering Selection Recommendations

Preferred Substitutes (Highest Compatibility):

MAX3225EEAP+T and MAX3224EEAP+T are the primary recommended substitutes. Both are active products from Analog Devices Inc./Maxim Integrated with ROHS3 compliance. MAX3225EEAP+T matches the original 1Mbps data rate and 500mV receiver hysteresis specification exactly. MAX3224EEAP+T provides 250kbps operation with identical hysteresis, suitable for applications not requiring maximum data rate.

Secondary Substitutes (Functional Equivalence):

ICL3225EIAZ and ICL3225EIAZ-T from Renesas Electronics are active products with ROHS3 compliance, 500mV receiver hysteresis, and 250kbps data rate. These parts maintain full RS232 protocol compliance and identical package specifications.

Alternative Substitutes (Extended Temperature Range):

SP3223EEA-L and SP3223EEA-L/TR from MaxLinear, Inc. are active products with ROHS3 compliance and -40°C to 85°C operating temperature matching the original specification. These parts operate at 235Kbps with 300mV receiver hysteresis.

Limited Compatibility:

MAX3223EEAP+ and MAX3223EEAP+T operate at reduced data rates (120Kbps) and lower receiver hysteresis (300mV). These are suitable only for applications with lower bandwidth requirements. SP3223ECA-L/TR has a restricted operating temperature range (0°C to 70°C) and is not recommended for applications requiring the full -40°C to 85°C range.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TRSF3223IDB with MAX3225EEAP+T without circuit modifications?

A: Yes. MAX3225EEAP+T is a direct functional equivalent with identical RS232 protocol, 2/2 driver/receiver configuration, 20-SSOP package, 3V to 5.5V supply range, -40°C to 85°C operating temperature, 1Mbps data rate, and 500mV receiver hysteresis. No circuit modifications are required.

Q: What is the difference between ICL3225EIAZ and ICL3225EIAZ-T?

A: Both parts are functionally identical Renesas Electronics RS232 transceivers with 2/2 configuration, 20-SSOP package, and 500mV hysteresis. The primary difference is packaging: ICL3225EIAZ is supplied in Tube packaging, while ICL3225EIAZ-T is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why do some substitutes have lower data rates than the original TRSF3223IDB?

A: The TRSF3223IDB operates at 1Mbps, while alternatives such as ICL3225EIAZ (250kbps) and MAX3223EEAP+ (120Kbps) have lower maximum data rates. These parts remain functionally compatible for RS232 serial communication because RS232 applications typically operate at standard baud rates (9600, 19200, 38400, 115200) well below the maximum rated data rates of all listed substitutes. Lower data rate specifications do not prevent substitution in legacy applications.

Q: Is SP3223ECA-L/TR suitable for industrial applications requiring -40°C operation?

A: No. SP3223ECA-L/TR has an operating temperature range of 0°C to 70°C, which does not meet the -40°C to 85°C specification of the original TRSF3223IDB. Use SP3223EEA-L or SP3223EEA-L/TR instead, which support the full -40°C to 85°C range.

Q: What does receiver hysteresis mean, and does a 300mV specification differ functionally from 500mV?

A: Receiver hysteresis is the voltage difference between the rising and falling threshold levels of the input comparator. A 500mV hysteresis provides greater noise immunity than 300mV. Parts with 300mV hysteresis (MAX3223 series, SP3223 series) are functionally compatible substitutes but offer slightly reduced noise margin. For applications in electrically noisy environments, 500mV hysteresis parts (MAX3224, MAX3225, ICL3225) are preferred.

Q: Are all listed substitutes RoHS compliant?

A: Yes. All substitute parts carry either ROHS3 Compliant or RoHS Compliant certification, meeting environmental and regulatory requirements equivalent to the original TRSF3223IDB.

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