ICL3221ECA RS232 Transceiver Interface - Equivalent & Substitute Parts

Part Overview

The ICL3221ECA is a full-duplex RS232 transceiver manufactured by Renesas Electronics Corporation, housed in a 16-SSOP surface mount package. This component operates across a 3V to 5.5V supply range with a 250kbps data rate and 500mV receiver hysteresis, designed for serial communication applications requiring single driver/receiver configuration.

The ICL3221ECA is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term product maintenance where original components are no longer in production.

Key Parameters

Parameter	Value
Manufacturer Part Number	ICL3221ECA
Manufacturer	Renesas Electronics Corporation
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	500mV
Mounting Type	Surface Mount
Package / Case	16-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ICL3221ECA is determined by the following critical parameters:

Protocol Compliance: All substitutes must implement RS232 full-duplex transceiver functionality
Package Compatibility: 16-SSOP surface mount package is mandatory for PCB layout compatibility
Electrical Specifications: Supply voltage range (3V ~ 5.5V), receiver hysteresis (500mV), and operating temperature range (0°C ~ 70°C) define the baseline compatibility envelope
Driver/Receiver Configuration: 1/1 configuration must be maintained
Data Rate Tolerance: Minimum 250kbps performance required; higher data rates are acceptable

Substitute parts are categorized as follows:

Parametric Equivalent: ICL3221ECAZ matches all electrical and mechanical specifications with identical performance characteristics, differing only in packaging format and product status (Active vs. Obsolete).

Direct Substitutes: MAX3227ECAE+, MAX3227ECAE+T, SN75C3221DBR, TRSF3221CDBR, TRSF3221ECDB, and TRSF3221ECDBR maintain full electrical compatibility with enhanced data rate performance (1Mbps) and active product status.

Upgrade Substitutes: SN65C3221DB and SN65C3221DBR provide extended operating temperature range (-40°C ~ 85°C) with 1Mbps data rate, suitable for applications requiring industrial temperature specifications.

Similar Parts: MAX3221CAE+ offers compatible form factor and electrical envelope with minor parameter variations (300mV hysteresis, 235Kbps data rate) and represents a functional alternative where exact specification matching is not critical.

Parameter Comparison

Part Number	Manufacturer	Product Status	Data Rate	Operating Temp	Receiver Hysteresis	RoHS Status	Packaging
ICL3221ECA	Renesas	Obsolete	250kbps	0°C ~ 70°C	500mV	Non-compliant	Tube
ICL3221ECAZ	Renesas	Active	250kbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Tube
MAX3227ECAE+	Analog Devices/Maxim	Active	1Mbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Tube
MAX3227ECAE+T	Analog Devices/Maxim	Active	1Mbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
SN75C3221DBR	Texas Instruments	Active	1Mbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Tape & Reel (TR)
TRSF3221CDBR	Texas Instruments	Last Time Buy	1Mbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Tape & Reel (TR)
TRSF3221ECDB	Texas Instruments	Last Time Buy	1Mbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Tube
TRSF3221ECDBR	Texas Instruments	Active	1Mbps	0°C ~ 70°C	500mV	ROHS3 Compliant	Cut Tape (CT)
SN65C3221DB	Texas Instruments	Last Time Buy	1Mbps	-40°C ~ 85°C	500mV	ROHS3 Compliant	Tube
SN65C3221DBR	Texas Instruments	Obsolete	1Mbps	-40°C ~ 85°C	500mV	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
MAX3221CAE+	Analog Devices/Maxim	Active	235Kbps	0°C ~ 70°C	300mV	ROHS3 Compliant	Tube

Engineering Selection Recommendations

Primary Selection - Parametric Equivalent

ICL3221ECAZ is the direct parametric equivalent with identical electrical performance and mechanical compatibility. This part maintains the original 250kbps data rate and 500mV hysteresis specification while offering Active product status and ROHS3 compliance, making it the preferred choice for direct replacement in existing designs.

Secondary Selection - Direct Substitutes with Enhanced Performance

MAX3227ECAE+, MAX3227ECAE+T, SN75C3221DBR, TRSF3221ECDBR, and TRSF3221ECDB provide 1Mbps data rate capability while maintaining all other electrical parameters. These parts are suitable for applications where increased data rate headroom is beneficial. All are ROHS3 compliant with Active or Last Time Buy status. Selection among these should be based on packaging requirements (Tube, Cut Tape, or Tape & Reel) and supply chain availability.

Extended Temperature Selection - Upgrade Substitutes

SN65C3221DB and SN65C3221DBR extend the operating temperature range to -40°C ~ 85°C, supporting industrial and automotive applications. These parts are appropriate for designs requiring enhanced thermal performance specifications. SN65C3221DBR is currently obsolete; SN65C3221DB remains available with Last Time Buy status.

Functional Alternative - Similar Parts

MAX3221CAE+ operates within the same electrical envelope with minor parameter variations (300mV hysteresis, 235Kbps data rate). This part is suitable only where exact specification matching is not critical and represents the lowest-cost alternative with highest inventory availability (16,400 units).

Compliance Consideration

All recommended substitutes except the original ICL3221ECA are ROHS3 compliant. For applications subject to RoHS regulations, ICL3221ECAZ, MAX3227ECAE+, MAX3227ECAE+T, SN75C3221DBR, TRSF3221CDBR, TRSF3221ECDB, TRSF3221ECDBR, SN65C3221DB, SN65C3221DBR, and MAX3221CAE+ all meet compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can ICL3221ECAZ be used as a direct replacement for ICL3221ECA?

A: Yes. ICL3221ECAZ is a parametric equivalent with identical electrical specifications (250kbps data rate, 500mV hysteresis, 3V-5.5V supply, 0°C-70°C operating range) and 16-SSOP package. The primary differences are product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No design modifications are required.

Q: What is the difference between the MAX3227 and MAX3221 series?

A: Both are RS232 full-duplex transceivers in 16-SSOP packages compatible with the ICL3221ECA electrical envelope. The MAX3227 series offers 1Mbps data rate compared to the original 250kbps specification. The MAX3221CAE+ variant has slightly reduced hysteresis (300mV vs. 500mV) and lower data rate (235Kbps), making it a functional but not exact equivalent.

Q: Are Texas Instruments SN75C3221DBR and TRSF3221ECDBR interchangeable?

A: Both parts maintain identical electrical specifications (1Mbps data rate, 500mV hysteresis, 3V-5.5V supply, 0°C-70°C operating range) and 16-SSOP package. The primary difference is packaging format: SN75C3221DBR is supplied in Tape & Reel (TR), while TRSF3221ECDBR is supplied in Cut Tape (CT). Selection depends on assembly process requirements and supply chain availability.

Q: When should SN65C3221DB be selected over other substitutes?

A: SN65C3221DB is appropriate for applications requiring extended operating temperature range (-40°C ~ 85°C) such as industrial, automotive, or outdoor environments. The original ICL3221ECA specification is limited to 0°C ~ 70°C. All other electrical parameters remain compatible with the original design.

Q: Is MAX3221CAE+ a suitable substitute for ICL3221ECA?

A: MAX3221CAE+ is a functional alternative with compatible form factor and supply voltage range. However, it has reduced receiver hysteresis (300mV vs. 500mV) and lower data rate (235Kbps vs. 250kbps). Use this part only where exact specification matching is not critical or where the application can tolerate these parameter variations.

Q: What packaging options are available for substitutes?

A: Substitutes are available in Tube, Cut Tape (CT), Cut Tape & Digi-Reel®, and Tape & Reel (TR) formats. Selection depends on assembly process requirements: Tube packaging for manual or small-batch assembly, Cut Tape for semi-automated processes, and Tape & Reel for high-volume automated assembly. All maintain identical 16-SSOP mechanical compatibility.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes except the original ICL3221ECA are ROHS3 compliant. For applications subject to RoHS regulations, ICL3221ECAZ is the direct equivalent with full compliance. All other substitutes also meet ROHS3 requirements.

Q: What is the inventory status for each substitute?

A: ICL3221ECAZ has 8,175 units available. MAX3227ECAE+ has 1,900 units. MAX3227ECAE+T has 3,100 units. SN75C3221DBR has 3,650 units. TRSF3221CDBR has 1,410 units. TRSF3221ECDB has 1,480 units. TRSF3221ECDBR has 1,600 units. SN65C3221DB has 1,180 units. SN65C3221DBR has 2,100 units. MAX3221CAE+ has 16,400 units. Inventory levels should be confirmed with suppliers for current availability.

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