TRSF3221IDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3221IDB is a full-duplex RS232 transceiver manufactured by Texas Instruments, configured as a 1/1 driver/receiver interface in a 16-SSOP surface mount package. This part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support. Substitute parts must maintain electrical compatibility across supply voltage, data rate, receiver hysteresis, operating temperature, and package specifications to ensure direct circuit board replacement without design modification.

Key Parameters

Parameter	TRSF3221IDB Value
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	1 Mbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across the following critical criteria:

Primary Matching Parameters:

Protocol: RS232
Number of Drivers/Receivers: 1/1
Duplex: Full
Package / Case: 16-SSOP (0.209", 5.30mm Width)
Voltage - Supply: 3V ~ 5.5V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Receiver Hysteresis: 500 mV (primary specification)
Data Rate: 1 Mbps (primary specification)

Substitute parts are classified into two categories:

Direct Manufacturer Equivalents: Parts from the same or different manufacturers that match all primary and secondary parameters without deviation.

Parametric Equivalents: Parts that match all primary parameters but may have minor variations in secondary parameters (data rate, receiver hysteresis, or MSL rating) that do not affect functional compatibility in standard RS232 applications.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Voltage - Supply	Operating Temperature	Package	Product Status	MSL
TRSF3221IDB	Texas Instruments	1 Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Obsolete	1
TRSF3221EIDBR	Texas Instruments	1 Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	1
MAX3227EIDB	Texas Instruments	1 Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Last Time Buy	1
SN65C3221DB	Texas Instruments	1 Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Last Time Buy	1
TRS3227IDB	Texas Instruments	1 Mbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Last Time Buy	1
ICL3221EIAZ	Renesas Electronics Corporation	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	3
ICL3221EIAZ-T	Renesas Electronics Corporation	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	3
ICL3221IAZ	Renesas Electronics Corporation	250 kbps	300 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	3
ICL3221IAZ-T	Renesas Electronics Corporation	250 kbps	300 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	3
MAX3221EEAE+	Analog Devices Inc./Maxim Integrated	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	1
MAX3221EEAE+T	Analog Devices Inc./Maxim Integrated	250 kbps	500 mV	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active	1

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Active Status):

TRSF3221EIDBR is the primary direct replacement, manufactured by Texas Instruments with active product status. This part maintains identical electrical specifications including 1 Mbps data rate and 500 mV receiver hysteresis. The part is available in Cut Tape (CT) & Digi-Reel® packaging with 4,492 units in stock.

Tier 2 - Parametric Equivalents (Active Status, Lower Data Rate):

ICL3221EIAZ-T and ICL3221EIAZ (Renesas Electronics Corporation) are active alternatives with 250 kbps data rate capability. These parts maintain 500 mV receiver hysteresis and identical supply voltage and temperature ranges. MSL rating is 3 (168 Hours) versus MSL 1 for the primary part. ICL3221EIAZ-T is available in Cut Tape (CT) & Digi-Reel® packaging with 2,105 units in stock.

MAX3221EEAE+T (Analog Devices Inc./Maxim Integrated) is an active alternative with 250 kbps data rate, 500 mV receiver hysteresis, and MSL 1 rating. This part offers the highest inventory availability at 25,100 units in Cut Tape (CT) & Digi-Reel® packaging.

Tier 3 - Parametric Equivalents (Last Time Buy Status):

MAX3227EIDB, SN65C3221DB, and TRS3227IDB are Texas Instruments parts with Last Time Buy status. These maintain full electrical compatibility with 1 Mbps data rate and 500 mV receiver hysteresis but have limited future availability.

Tier 4 - Parametric Equivalents (Active Status, Reduced Hysteresis):

ICL3221IAZ and ICL3221IAZ-T (Renesas Electronics Corporation) feature 300 mV receiver hysteresis and 250 kbps data rate. These parts are suitable only for applications where reduced hysteresis does not impact signal integrity requirements.

Frequently Asked Questions (FAQ)

Q: Can TRSF3221EIDBR be used as a direct replacement for TRSF3221IDB?

A: Yes. TRSF3221EIDBR is a direct equivalent manufactured by Texas Instruments with identical electrical specifications: 1 Mbps data rate, 500 mV receiver hysteresis, 3V ~ 5.5V supply voltage, -40°C ~ 85°C operating temperature, and 16-SSOP package. The primary difference is product status (Active versus Obsolete) and packaging format (Cut Tape & Digi-Reel® versus standard tube).

Q: What is the difference between ICL3221EIAZ and ICL3221IAZ?

A: Both are Renesas Electronics Corporation parts in 16-SSOP packages with identical supply voltage and temperature ranges. The primary difference is receiver hysteresis: ICL3221EIAZ specifies 500 mV hysteresis, while ICL3221IAZ specifies 300 mV hysteresis. Both operate at 250 kbps data rate. Selection depends on application-specific noise immunity requirements.

Q: Why do some substitute parts have lower data rates (250 kbps versus 1 Mbps)?

A: Data rate specifications reflect the maximum guaranteed communication speed under specified conditions. Parts rated at 250 kbps are functionally compatible with applications operating at lower speeds. For applications requiring 1 Mbps operation, select parts explicitly rated at 1 Mbps: TRSF3221EIDBR, MAX3227EIDB, SN65C3221DB, or TRS3227IDB.

Q: What does MSL rating mean for this component?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (30°C, 85% relative humidity) before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 3 (168 Hours) requires controlled storage and handling. For applications with extended lead times or inventory storage, MSL 1 rated parts (TRSF3221EIDBR, MAX3227EIDB, SN65C3221DB, TRS3227IDB, MAX3221EEAE+, MAX3221EEAE+T) are preferred.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the original TRSF3221IDB.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three packaging formats: Tube, Cut Tape (CT) & Digi-Reel®, and in one case (MAX3227EIDB) Tube packaging. Cut Tape & Digi-Reel® packaging is suitable for automated assembly processes. Tube packaging is suitable for manual assembly or lower-volume applications. All parts use identical 16-SSOP (0.209", 5.30mm Width) surface mount package geometry.

Q: Which substitute part has the highest inventory availability?

A: MAX3221EEAE+T (Analog Devices Inc./Maxim Integrated) has the highest inventory at 25,100 units in Cut Tape (CT) & Digi-Reel® packaging. This part is active status with 250 kbps data rate, 500 mV receiver hysteresis, and MSL 1 rating.

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