TRSF3221CDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3221CDB is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-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 500 mV receiver hysteresis specification. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRSF3221CDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	1 Mbps
Receiver Hysteresis	500 mV
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	16-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TRSF3221CDB is determined by strict adherence to the following electrical and mechanical parameters:

Critical 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: 0°C ~ 70°C
Mounting Type: Surface Mount

Allowable Variations:

Data Rate: Substitute parts may operate at 250 kbps or higher (1 Mbps minimum preferred for full compatibility)
Receiver Hysteresis: 300 mV or 500 mV acceptable
Packaging Format: Tube, Tape & Reel (TR), or Cut Tape (CT) & Digi-Reel®
Product Status: Active or Last Time Buy preferred over Obsolete

Substitute parts are grouped by manufacturer and data rate capability. Parts meeting all critical parameters are considered direct functional equivalents regardless of packaging format or product status.

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Packaging	Product Status	Inventory (Pcs)
TRSF3221CDB	Texas Instruments	1 Mbps	500 mV	Tube	Obsolete	907
TRSF3221CDBR	Texas Instruments	1 Mbps	500 mV	Tape & Reel (TR)	Last Time Buy	1410
MAX3227CDB	Analog Devices Inc./Maxim Integrated	1 Mbps	500 mV	Tube	Obsolete	1065
MAX3227ECAE+T	Analog Devices Inc./Maxim Integrated	1 Mbps	500 mV	Cut Tape (CT) & Digi-Reel®	Active	3100
MAX3227CAE+	Analog Devices Inc./Maxim Integrated	1 Mbps	500 mV	Tube	Active	3051
MAX3221ECAE+	Analog Devices Inc./Maxim Integrated	250 kbps	500 mV	Tube	Active	2100
MAX3221ECAE+T	Analog Devices Inc./Maxim Integrated	250 kbps	500 mV	Cut Tape (CT) & Digi-Reel®	Active	24102
ICL3221CAZ	Renesas Electronics Corporation	250 kbps	300 mV	Tube	Active	5100
ICL3221CAZ-T	Renesas Electronics Corporation	250 kbps	300 mV	Cut Tape (CT) & Digi-Reel®	Active	5400
ICL3221ECAZ	Renesas Electronics Corporation	250 kbps	500 mV	Tube	Active	8175
ICL3221ECAZ-T	Renesas Electronics Corporation	250 kbps	500 mV	Tape & Reel (TR)	Active	1613

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Preferred): TRSF3221CDBR, MAX3227CDB, MAX3227ECAE+T, and MAX3227CAE+ maintain full electrical equivalence with the TRSF3221CDB, including 1 Mbps data rate capability and 500 mV receiver hysteresis. Among these, MAX3227ECAE+T and MAX3227CAE+ carry Active product status with ROHS3 compliance, providing the longest procurement window and supply continuity.

Tier 2 - Functional Equivalents (Reduced Data Rate): MAX3221ECAE+, MAX3221ECAE+T, ICL3221ECAZ, and ICL3221ECAZ-T operate at 250 kbps, which is below the original 1 Mbps specification. These parts are suitable for applications where the lower data rate does not impact system performance. All carry Active product status and ROHS3 compliance.

Tier 3 - Functional Equivalents (Reduced Hysteresis): ICL3221CAZ and ICL3221CAZ-T feature 300 mV receiver hysteresis compared to the 500 mV specification of the original part. These Renesas devices operate at 250 kbps and are Active products with ROHS3 compliance. Selection should account for noise margin requirements in the target application.

All substitute parts maintain identical supply voltage range (3V ~ 5.5V), operating temperature range (0°C ~ 70°C), package footprint (16-SSOP), and surface mount mounting type. All are ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can MAX3221ECAE+T replace TRSF3221CDB directly? A: MAX3221ECAE+T is functionally compatible but operates at 250 kbps versus the original 1 Mbps specification. It maintains identical supply voltage, temperature range, package footprint, and receiver hysteresis. Selection depends on whether your application requires the full 1 Mbps data rate capability.

Q: What is the difference between ICL3221CAZ and ICL3221ECAZ? A: Both are Renesas RS232 transceivers in 16-SSOP packages with identical data rate (250 kbps) and supply specifications. The primary difference is receiver hysteresis: ICL3221CAZ specifies 300 mV while ICL3221ECAZ specifies 500 mV. The "E" temperature grade designation in ICL3221ECAZ indicates extended temperature range capability.

Q: Are packaging format differences significant for substitution? A: Packaging format (Tube, Tape & Reel, Cut Tape & Digi-Reel) affects procurement and assembly processes but does not impact electrical performance or PCB footprint. All formats are compatible with standard surface mount assembly equipment. Selection should align with your manufacturing process requirements.

Q: Why do some substitutes have lower data rates? A: The MAX3221 and ICL3221 series are designed for lower-speed RS232 applications (250 kbps), while the MAX3227 and TRSF3221 series support higher speeds (1 Mbps). Lower-speed parts are suitable for legacy systems and applications where bandwidth is not a limiting factor.

Q: Which substitute offers the best long-term availability? A: MAX3227ECAE+T and MAX3227CAE+ carry Active product status from Analog Devices Inc./Maxim Integrated, indicating ongoing production and the longest procurement window. ICL3221ECAZ and ICL3221ECAZ-T from Renesas also maintain Active status with substantial inventory levels.

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