MAX3221ECAE RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3221ECAE is a full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, designed for single driver/receiver applications in 16-SSOP surface mount packaging. This component operates across a 3V to 5.5V supply range with a 250kbps data rate and 500mV receiver hysteresis. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3221ECAE
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Interface
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	500 mV
Mounting Type	Surface Mount
Package / Case	16-SSOP (0.209", 5.30mm Width)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX3221ECAE is determined by the following critical parameters:

Protocol Compatibility: RS232 full-duplex transceiver
Driver/Receiver Configuration: 1/1 (single driver, single receiver)
Package Type: 16-SSOP surface mount form factor
Supply Voltage Range: 3V ~ 5.5V operation
Data Rate: 250kbps minimum capability
Receiver Hysteresis: 500mV specification
Duplex Mode: Full-duplex operation

Substitute parts are classified into three categories:

Parametric Equivalents maintain identical electrical specifications and package form factor, with the primary difference being product status (active vs. obsolete) and RoHS compliance.

Direct Substitutes provide equivalent functionality with minor parameter variations (such as receiver hysteresis tolerance or data rate capability) while maintaining the same package and core electrical characteristics.

Upgrade Options extend the operating temperature range to -40°C ~ 85°C, providing enhanced thermal performance for demanding applications while preserving all other critical parameters.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status	RoHS Status
MAX3221ECAE	Analog Devices	RS232	1/1	250kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Obsolete	Non-compliant
MAX3221ECAE+	Analog Devices	RS232	1/1	250kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Active	ROHS3 Compliant
MAX3226CAE+	Analog Devices	RS232	1/1	250kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Active	ROHS3 Compliant
MAX3226ECAE+	Analog Devices	RS232	1/1	250kbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Active	ROHS3 Compliant
ICL3221CAZ-T	Renesas Electronics	RS232	1/1	250kbps	3V ~ 5.5V	0°C ~ 70°C	300 mV	16-SSOP	Active	ROHS3 Compliant
SN75C3221DBR	Texas Instruments	RS232	1/1	1Mbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Active	ROHS3 Compliant
TRSF3221CDBR	Texas Instruments	RS232	1/1	1Mbps	3V ~ 5.5V	0°C ~ 70°C	500 mV	16-SSOP	Last Time Buy	ROHS3 Compliant
MAX3221EIDBR	Texas Instruments	RS232	1/1	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	16-SSOP	Active	ROHS3 Compliant
MAX3221IDBE4	Texas Instruments	RS232	1/1	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	16-SSOP	Obsolete	ROHS3 Compliant
MAX3221IDBR	Texas Instruments	RS232	1/1	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	16-SSOP	Active	ROHS3 Compliant
TRS3221EIDBR	Texas Instruments	RS232	1/1	250kbps	3V ~ 5.5V	-40°C ~ 85°C	500 mV	16-SSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Temperature Range)

MAX3221ECAE+ is the primary equivalent, offering identical electrical and thermal specifications with active product status and ROHS3 compliance. This part is recommended for applications requiring exact parameter matching with modern compliance certifications.

MAX3226CAE+ and MAX3226ECAE+ provide parametric equivalence with active status and full RoHS3 compliance. These parts are suitable for new designs and legacy system updates.

For Applications Requiring Extended Temperature Range

MAX3221EIDBR and MAX3221IDBR extend the operating temperature range to -40°C ~ 85°C while maintaining all other electrical specifications. These parts are recommended for industrial and automotive applications requiring enhanced thermal performance. Both parts carry active product status and ROHS3 compliance.

TRS3221EIDBR offers equivalent extended temperature capability with active product status and ROHS3 compliance.

For Higher Data Rate Requirements

SN75C3221DBR and TRSF3221CDBR support 1Mbps data rates compared to the 250kbps specification of the original part. These parts maintain identical supply voltage, package form factor, and receiver hysteresis. Both carry ROHS3 compliance. TRSF3221CDBR is designated as Last Time Buy.

For Cross-Manufacturer Sourcing

ICL3221CAZ-T (Renesas Electronics) provides parametric equivalence with a 300mV receiver hysteresis specification compared to the 500mV of the original part. This part is active and ROHS3 compliant, offering alternative sourcing from a different manufacturer.

Frequently Asked Questions (FAQ)

Q: Can MAX3221ECAE+ be used as a direct replacement for MAX3221ECAE?

A: Yes. MAX3221ECAE+ maintains identical electrical specifications, package form factor, and operating temperature range. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between the MAX3226 series and MAX3221 series?

A: Both series maintain identical electrical and thermal specifications within the provided parameters. The MAX3226 variants are available as active products with ROHS3 compliance, making them suitable for new designs and system updates.

Q: Are the extended temperature range parts (MAX3221EIDBR, MAX3221IDBR, TRS3221EIDBR) pin-compatible with the original MAX3221ECAE?

A: Yes. All parts maintain the 16-SSOP package form factor and identical pin configuration. The extended temperature range (-40°C ~ 85°C) is the primary functional difference, with all other electrical parameters remaining constant.

Q: Can SN75C3221DBR or TRSF3221CDBR be used if the application only requires 250kbps operation?

A: Yes. Both parts support 1Mbps data rates, which exceeds the 250kbps requirement. They maintain identical supply voltage, receiver hysteresis, and package specifications. The higher data rate capability does not affect operation at lower speeds.

Q: What is the significance of the receiver hysteresis difference in ICL3221CAZ-T?

A: ICL3221CAZ-T specifies 300mV receiver hysteresis compared to 500mV in the original part. This represents a tighter input threshold specification. The part remains functionally compatible for RS232 full-duplex operation within the specified supply voltage and data rate parameters.

Q: Which substitute part offers the best compliance profile for new designs?

A: MAX3221ECAE+, MAX3226CAE+, MAX3226ECAE+, MAX3221EIDBR, MAX3221IDBR, and TRS3221EIDBR all carry ROHS3 compliance and active product status. Selection depends on thermal requirements: standard temperature range (0°C ~ 70°C) or extended range (-40°C ~ 85°C).

Q: Is packaging format consistent across all substitute parts?

A: All substitute parts use 16-SSOP surface mount packaging with 0.209" width and 5.30mm dimensions. Packaging variations exist in delivery format (Tube, Cut Tape, Tape & Reel), which affects handling and storage but not electrical or mechanical compatibility.

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