TRSF3221ECDB RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The TRSF3221ECDB is a full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-SSOP surface mount package. This interface IC operates across a 3V to 5.5V supply range with a 1Mbps data rate and 500mV receiver hysteresis. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TRSF3221ECDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	1Mbps
Receiver Hysteresis	500 mV
Voltage Supply Range	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
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TRSF3221ECDB is determined by the following critical parameters:

Primary Matching Criteria:

RS232 protocol compliance
1/1 driver/receiver configuration
Full-duplex operation
3V ~ 5.5V supply voltage compatibility
0°C ~ 70°C operating temperature range
16-SSOP package footprint (0.209", 5.30mm Width)
Surface mount technology

Secondary Considerations:

Data rate capability (minimum 1Mbps required)
Receiver hysteresis specification (500mV preferred)
RoHS3 compliance
MSL rating and moisture sensitivity

Parts are grouped into three categories based on substitution relationship:

Category 1: Parametric Equivalents — Parts matching all primary criteria with identical electrical performance characteristics.

Category 2: Direct Substitutes — Parts meeting primary criteria with minor parameter variations (data rate, hysteresis, MSL) that do not affect functional compatibility in standard RS232 applications.

Category 3: Manufacturer Recommended Alternatives — Parts with package variations (16-TSSOP vs 16-SSOP) requiring PCB layout adjustment but maintaining electrical equivalence.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	Product Status	RoHS3
TRSF3221ECDB	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Last Time Buy	Yes
MAX3227CDB	Texas Instruments	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Obsolete	Yes
MAX3227ECAE+T	Analog Devices Inc./Maxim Integrated	RS232	1/1	1Mbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active	Yes
ICL3221CAZ	Renesas Electronics Corporation	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active	Yes
ICL3221CAZ-T	Renesas Electronics Corporation	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active	Yes
ICL3221ECAZ	Renesas Electronics Corporation	RS232	1/1	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active	Yes
ICL3221ECAZ-T	Renesas Electronics Corporation	RS232	1/1	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active	Yes
ICL3221CVZ	Intersil	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	Yes
ICL3221CVZ-T	Renesas Electronics Corporation	RS232	1/1	250kbps	300 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	Yes
ICL3221ECVZ	Renesas Electronics Corporation	RS232	1/1	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	Yes
ICL3221ECVZ-T	Renesas Electronics Corporation	RS232	1/1	250kbps	500 mV	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active	Yes

Engineering Selection Recommendations

Highest Priority Substitutes (Active Status, 16-SSOP Package):

MAX3227ECAE+T is the primary recommended substitute. Manufactured by Analog Devices Inc./Maxim Integrated and currently in Active product status, this part maintains identical electrical specifications to the TRSF3221ECDB including 1Mbps data rate, 500mV receiver hysteresis, and 16-SSOP package geometry. RoHS3 compliance and MSL-1 rating ensure compatibility with existing supply chain and manufacturing processes.

ICL3221ECAZ and ICL3221ECAZ-T (Renesas Electronics Corporation) are secondary substitutes in 16-SSOP configuration. Both parts are Active status with matching receiver hysteresis (500mV) and supply voltage range. Data rate is specified at 250kbps, which is lower than the original 1Mbps specification but remains functionally compatible for standard RS232 communication applications. MSL-3 rating requires controlled storage conditions (168 hours at 85°C/85% RH).

Alternative Substitutes (Package Variation, 16-TSSOP):

ICL3221ECVZ and ICL3221ECVZ-T offer electrical equivalence with a package footprint change from 16-SSOP (0.209", 5.30mm Width) to 16-TSSOP (0.173", 4.40mm Width). These parts maintain 500mV receiver hysteresis and Active product status. PCB layout modification is required to accommodate the narrower package width. MSL-3 rating applies.

Obsolete Status Parts:

MAX3227CDB is listed as Obsolete and should not be selected for new designs despite matching electrical specifications. This part is suitable only for legacy system maintenance where existing inventory is available.

Frequently Asked Questions (FAQ)

Q: Can ICL3221ECAZ be used as a direct replacement for TRSF3221ECDB?

A: ICL3221ECAZ is functionally compatible as a direct substitute in the 16-SSOP package. The primary difference is data rate specification: ICL3221ECAZ is rated at 250kbps versus the original 1Mbps. For standard RS232 applications operating below 250kbps, this part provides equivalent performance. Receiver hysteresis matches at 500mV, and supply voltage range is identical (3V ~ 5.5V).

Q: What is the difference between ICL3221ECAZ and ICL3221ECAZ-T?

A: Both parts are electrically identical. The difference is packaging format: ICL3221ECAZ is supplied in Tube packaging, while ICL3221ECAZ-T is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences.

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

A: Data rate specification reflects the maximum guaranteed performance under specified conditions. Parts rated at 250kbps remain compatible with applications operating at lower speeds. If your design requires sustained operation at 1Mbps, MAX3227ECAE+T is the recommended choice as it maintains the original 1Mbps specification.

Q: Can I use ICL3221ECVZ instead of TRSF3221ECDB?

A: ICL3221ECVZ is electrically equivalent but uses a different package: 16-TSSOP (0.173", 4.40mm Width) instead of 16-SSOP (0.209", 5.30mm Width). PCB layout modification is required. The narrower package width may allow for improved board density in new designs but requires footprint redesign for existing layouts.

Q: What does MSL-1 versus MSL-3 mean for component handling?

A: MSL-1 (Unlimited) indicates no moisture sensitivity restrictions; components can be stored indefinitely at room conditions. MSL-3 (168 Hours) requires controlled storage at 85°C/85% relative humidity for a maximum of 168 hours before soldering. ICL3221 series parts require bake-out procedures if storage limits are exceeded. MAX3227ECAE+T has MSL-1 rating and does not require special moisture control.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All parts in this substitution list are RoHS3 compliant, ensuring compatibility with environmental regulations and supply chain requirements.

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