MAX3221EIDB RS232 Transceiver Interface IC Equivalent & Substitute Parts

Part Overview

The MAX3221EIDB is a full-duplex RS232 transceiver interface IC manufactured by Texas Instruments, housed in a 16-SSOP surface mount package. This component operates across a 3V to 5.5V supply voltage range with a 250 kbps data rate and 500 mV receiver hysteresis, designed for serial communication applications requiring RS232 protocol compliance.

The MAX3221EIDB is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this interface transceiver.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3221EIDB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	250 kbps
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 for the MAX3221EIDB is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol: RS232
Number of Drivers/Receivers: 1/1
Duplex: Full
Data Rate: 250 kbps
Voltage - Supply: 3V ~ 5.5V
Mounting Type: Surface Mount
Package / Case: 16-SSOP or 16-TSSOP

Secondary Compatibility Factors:

Receiver Hysteresis: 500 mV (preferred) or 300 mV (acceptable with design verification)
Operating Temperature: -40°C ~ 85°C (preferred) or 0°C ~ 70°C (acceptable with application constraints)
RoHS Status: ROHS3 Compliant (required)

Substitute parts are grouped into two categories:

Category 1 - Direct Parametric Equivalents (Identical electrical and thermal specifications): Parts matching all primary criteria and secondary factors without deviation.

Category 2 - Functional Equivalents (Matching primary criteria with minor parameter variations): Parts with identical protocol, driver/receiver configuration, and package compatibility but with acceptable variations in receiver hysteresis or operating temperature range. These require design review to confirm suitability for specific application thermal and signal integrity requirements.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status
MAX3221EIDB	Texas Instruments	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Obsolete
MAX3221IDBE4	Texas Instruments	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Obsolete
MAX3221EEAE+T	Analog Devices Inc./Maxim Integrated	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SSOP	Active
ICL3221CAZ	Renesas Electronics Corporation	RS232	1/1	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active
ICL3221CAZ-T	Renesas Electronics Corporation	RS232	1/1	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active
ICL3221CVZ	Intersil	RS232	1/1	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active
ICL3221CVZ-T	Renesas Electronics Corporation	RS232	1/1	Full	300 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active
ICL3221ECAZ	Renesas Electronics Corporation	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active
ICL3221ECAZ-T	Renesas Electronics Corporation	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-SSOP	Active
ICL3221ECVZ	Renesas Electronics Corporation	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active
ICL3221ECVZ-T	Renesas Electronics Corporation	RS232	1/1	Full	500 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	16-TSSOP	Active

Engineering Selection Recommendations

Direct Replacement (No Design Modification Required):

MAX3221EEAE+T is the primary recommended substitute. Manufactured by Analog Devices Inc./Maxim Integrated, this part maintains identical electrical specifications to the MAX3221EIDB, including 500 mV receiver hysteresis and -40°C to 85°C operating temperature range. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term supply chain availability and compatibility with existing designs.

Active Production Alternatives (Design Review Required):

ICL3221ECAZ and ICL3221ECAZ-T (Renesas Electronics Corporation) provide functional equivalence with matching 500 mV receiver hysteresis but operate within a narrower temperature range (0°C to 70°C). These parts are suitable for applications where the extended low-temperature performance of the original part is not required. Both variants are in active production with ROHS3 compliance.

ICL3221CAZ and ICL3221CAZ-T (Renesas Electronics Corporation) offer alternative substitution with 300 mV receiver hysteresis and 0°C to 70°C operating temperature. These parts require signal integrity analysis to confirm adequate noise margin in the target application.

Package Variant Consideration:

ICL3221CVZ, ICL3221CVZ-T, ICL3221ECVZ, and ICL3221ECVZ-T utilize 16-TSSOP packaging (0.173" width) instead of 16-SSOP (0.209" width). These parts are electrically compatible but require PCB layout modification to accommodate the narrower package footprint.

Frequently Asked Questions (FAQ)

Q: Can MAX3221EEAE+T be used as a direct drop-in replacement for MAX3221EIDB?

A: Yes. MAX3221EEAE+T matches all critical electrical parameters: RS232 protocol, 1/1 driver/receiver configuration, full-duplex operation, 500 mV receiver hysteresis, 250 kbps data rate, 3V to 5.5V supply voltage, -40°C to 85°C operating temperature, and 16-SSOP package. No design modifications are required.

Q: What is the difference between ICL3221CAZ and ICL3221ECAZ?

A: Both parts are manufactured by Renesas Electronics Corporation in 16-SSOP packaging with identical supply voltage and data rate specifications. The primary difference is receiver hysteresis: ICL3221CAZ provides 300 mV hysteresis, while ICL3221ECAZ provides 500 mV hysteresis matching the original MAX3221EIDB specification. Operating temperature range is identical at 0°C to 70°C for both variants.

Q: Why do some substitutes have a narrower operating temperature range?

A: ICL3221 series parts from Renesas Electronics Corporation are specified for 0°C to 70°C operation, compared to the MAX3221EIDB range of -40°C to 85°C. Applications requiring extended low-temperature operation below 0°C or high-temperature operation above 70°C must use MAX3221EEAE+T or verify that the narrower range is acceptable for the target environment.

Q: What is the significance of the "-T" suffix in part numbers?

A: The "-T" suffix indicates Cut Tape (CT) and Digi-Reel packaging format, as opposed to Tube or Bulk packaging. This designation affects procurement and handling but does not alter electrical specifications or functional compatibility.

Q: Are 16-TSSOP variants (ICL3221CVZ, ICL3221ECVZ) compatible with existing PCB layouts designed for 16-SSOP?

A: No. The 16-TSSOP package has a narrower body width (0.173" versus 0.209") and requires PCB footprint modification. Existing 16-SSOP layouts cannot accommodate 16-TSSOP components without redesign. Use 16-SSOP variants (ICL3221CAZ, ICL3221ECAZ) for direct PCB compatibility.

Q: What is the inventory status of substitute parts?

A: MAX3221EEAE+T has 25,100 units in stock. ICL3221ECAZ-T has 1,613 units, ICL3221ECVZ-T has 1,659 units, ICL3221CVZ-T has 3,460 units, ICL3221CAZ-T has 5,400 units, and ICL3221CAZ has 5,100 units available. Inventory levels support both immediate and sustained production requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory status of the original MAX3221EIDB component.

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