SP3222ECT-L RS232 Transceiver: Equivalent & Substitute Parts

Part Overview

The SP3222ECT-L is a 2/2 full-duplex RS232 transceiver manufactured by MaxLinear, Inc., housed in an 18-SOIC surface mount package. This interface IC operates across a 3V to 5.5V supply range and is designed for serial communication applications requiring RS232 protocol compliance. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	SP3222ECT-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS232
Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	235 Kbps
Voltage Supply	3V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	18-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the SP3222ECT-L is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS232
Drivers/Receivers: 2/2 configuration
Duplex: Full
Package: 18-SOIC (0.295", 7.50mm Width)
Voltage Supply: 3V ~ 5.5V
Mounting Type: Surface Mount

Allowable Variations:

Receiver Hysteresis: 300 mV to 500 mV (within RS232 specification tolerance)
Data Rate: 120 Kbps to 1 Mbps (all exceed minimum RS232 requirements)
Operating Temperature: Extended ranges (-40°C ~ 85°C) are compatible with 0°C ~ 70°C applications
RoHS Status: ROHS3 Compliant is equivalent to RoHS Compliant
MSL Rating: Lower MSL values (1 = Unlimited) indicate improved moisture resistance

All substitute parts listed maintain identical package geometry, pin configuration, and core RS232 transceiver functionality.

Parameter Comparison

Part Number	Manufacturer	Drivers/Receivers	Receiver Hysteresis	Data Rate	Voltage Supply	Operating Temperature	Package	RoHS Status	Product Status
SP3222ECT-L	MaxLinear, Inc.	2/2	300 mV	235 Kbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	RoHS Compliant	Discontinued
ADM3222ARWZ	Analog Devices Inc.	2/2	400 mV	460 Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	ROHS3 Compliant	Active
ADM3222ARWZ-REEL	Analog Devices Inc.	2/2	400 mV	460 Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	ROHS3 Compliant	Active
ADM3222ARWZ-REEL7	Analog Devices Inc.	2/2	400 mV	460 Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	ROHS3 Compliant	Active
MAX3222CWN+	Analog Devices Inc./Maxim Integrated	2/2	300 mV	120 Kbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	ROHS3 Compliant	Active
MAX3222CWN+T	Analog Devices Inc./Maxim Integrated	2/2	300 mV	120 Kbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	ROHS3 Compliant	Active
MAX3222ECWN+	Analog Devices Inc./Maxim Integrated	2/2	500 mV	1 Mbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	ROHS3 Compliant	Active
MAX3222ECWN+T	Analog Devices Inc./Maxim Integrated	2/2	500 mV	1 Mbps	3V ~ 5.5V	0°C ~ 70°C	18-SOIC	ROHS3 Compliant	Active
MAX3222EEWN+	Analog Devices Inc./Maxim Integrated	2/2	500 mV	1 Mbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	ROHS3 Compliant	Active
MAX3222EEWN+T	Analog Devices Inc./Maxim Integrated	2/2	500 mV	1 Mbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	ROHS3 Compliant	Active
MAX3222EWN+	Analog Devices Inc./Maxim Integrated	2/2	300 mV	120 Kbps	3V ~ 5.5V	-40°C ~ 85°C	18-SOIC	ROHS3 Compliant	Active

Engineering Selection Recommendations

All listed substitute parts are active production components with ROHS3 compliance, providing superior regulatory status compared to the discontinued SP3222ECT-L. Selection among substitutes depends on application requirements:

For Standard Operating Temperature Range (0°C ~ 70°C): MAX3222CWN+, MAX3222CWN+T, MAX3222ECWN+, MAX3222ECWN+T, and MAX3222EWN+ are suitable. The MAX3222ECWN+ and MAX3222ECWN+T variants offer the highest data rate (1 Mbps) and receiver hysteresis (500 mV), providing enhanced noise immunity.

For Extended Operating Temperature Range (-40°C ~ 85°C): ADM3222ARWZ variants, MAX3222EEWN+, MAX3222EEWN+T, and MAX3222EWN+ support wider temperature operation. The ADM3222 series provides 460 Kbps data rate with 400 mV hysteresis. The MAX3222EEWN+ variants deliver 1 Mbps performance across the extended range.

For Packaging Considerations: Tube packaging is available for all parts. Cut Tape & Digi-Reel and Tape & Reel options are available for specific variants, accommodating different assembly and procurement workflows.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SP3222ECT-L with any of these substitutes? A: Yes, all listed parts maintain identical 18-SOIC package geometry, pin configuration, and RS232 2/2 full-duplex transceiver functionality. No PCB layout modifications are required.

Q: What is the difference between ADM3222ARWZ, ADM3222ARWZ-REEL, and ADM3222ARWZ-REEL7? A: These are the same part with different packaging options. ADM3222ARWZ is supplied in Tube packaging, while REEL and REEL7 variants use Cut Tape & Digi-Reel packaging. Electrical specifications are identical.

Q: Why do MAX3222 variants have different data rates? A: The MAX3222 family includes multiple temperature and performance grades. CWN+ and EWN+ variants operate at 120 Kbps, while ECWN+ and EEWN+ variants support 1 Mbps. All exceed the SP3222ECT-L's 235 Kbps specification.

Q: Which substitute offers the best noise immunity? A: MAX3222ECWN+, MAX3222ECWN+T, MAX3222EEWN+, and MAX3222EEWN+T provide 500 mV receiver hysteresis, compared to 300 mV in the original part and 400 mV in ADM3222 variants.

Q: Are all substitutes RoHS compliant? A: Yes, all substitute parts carry ROHS3 compliance, which is equivalent to and supersedes the RoHS Compliant status of the SP3222ECT-L.

Q: Which substitute is best for high-temperature applications? A: ADM3222ARWZ variants, MAX3222EEWN+, MAX3222EEWN+T, and MAX3222EWN+ support -40°C ~ 85°C operation, suitable for industrial and automotive environments.

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