MAX222CWN RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX222CWN is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated in an 18-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MAX222CWN operates within a 4.5V to 5.5V supply range with a 250 kbps data rate and 500 mV receiver hysteresis, designed for industrial and legacy communication applications requiring RS232 protocol compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX222CWN
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Data Rate	250 kbps
Receiver Hysteresis	500 mV
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	18-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX222CWN is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Protocol: RS232
Number of Drivers/Receivers: 2/2
Duplex: Full
Package / Case: 18-SOIC (0.295", 7.50mm Width)
Voltage - Supply: 4.5V ~ 5.5V
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Data Rate: 200 kbps or higher
Receiver Hysteresis: 400 mV or higher
Operating Temperature: May extend beyond 0°C ~ 70°C
Product Status: Active preferred over obsolete
RoHS Status: ROHS3 Compliant preferred

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (compatible within allowed parameter ranges).

Parameter Comparison

Part Number	Manufacturer	Data Rate	Receiver Hysteresis	Operating Temperature	Product Status	RoHS Status	Packaging
MAX222CWN	Analog Devices Inc./Maxim Integrated	250 kbps	500 mV	0°C ~ 70°C	Obsolete	RoHS non-compliant	Tube
MAX222CWN+	Analog Devices Inc./Maxim Integrated	250 kbps	500 mV	0°C ~ 70°C	Active	ROHS3 Compliant	Tube
ADM222ARZ	Analog Devices Inc.	200 kbps	400 mV	-40°C ~ 85°C	Active	ROHS3 Compliant	Tube
ADM222ARZ-REEL	Analog Devices Inc.	200 kbps	400 mV	-40°C ~ 85°C	Active	ROHS3 Compliant	Cut Tape (CT)
LT1080ISW#PBF	Analog Devices Inc.	250 kbps	400 mV	-40°C ~ 85°C	Active	ROHS3 Compliant	Tube
LT1080ISW#TRPBF	Analog Devices Inc.	250 kbps	400 mV	-40°C ~ 85°C	Active	ROHS3 Compliant	Tape & Reel (TR)
LT1780CSW#TRPBF	Analog Devices Inc.	250 kbps	400 mV	0°C ~ 70°C	Active	ROHS3 Compliant	Tape & Reel (TR)
MAX222CDWR	Texas Instruments	200 kbps	500 mV	0°C ~ 70°C	Obsolete	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®
MAX222IDWR	Texas Instruments	200 kbps	500 mV	-40°C ~ 85°C	Obsolete	ROHS3 Compliant	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Substitute: MAX222CWN+

The MAX222CWN+ is the direct parametric equivalent with identical electrical specifications (250 kbps data rate, 500 mV receiver hysteresis, 0°C ~ 70°C operating range). The primary advantage is active product status and ROHS3 compliance, eliminating obsolescence risk and regulatory concerns. This part is recommended as the first choice for direct replacement in new designs and legacy system updates.

Secondary Substitutes: LT1080ISW#TRPBF and LT1080ISW#PBF

The LT1080 series maintains the 250 kbps data rate and 18-SOIC package footprint. These parts feature extended operating temperature range (-40°C ~ 85°C) and active product status with ROHS3 compliance. The trade-off is reduced receiver hysteresis (400 mV versus 500 mV), which remains within acceptable RS232 specifications. Tape & Reel packaging (LT1080ISW#TRPBF) is preferred for high-volume procurement.

Tertiary Substitutes: ADM222ARZ and ADM222ARZ-REEL

The ADM222 series provides active product status and extended temperature range (-40°C ~ 85°C) with ROHS3 compliance. Data rate is reduced to 200 kbps and receiver hysteresis to 400 mV. These parameters remain compliant with RS232 protocol requirements. The ADM222ARZ-REEL variant in Cut Tape packaging is suitable for automated assembly processes.

Alternative: LT1780CSW#TRPBF

The LT1780CSW#TRPBF maintains the original operating temperature range (0°C ~ 70°C) and 250 kbps data rate. This part is selected when thermal performance matching the MAX222CWN is required. Active product status and ROHS3 compliance provide regulatory advantages over the obsolete original part.

Not Recommended: MAX222CDWR and MAX222IDWR

While these Texas Instruments parts maintain the 18-SOIC package and RS232 protocol, both are classified as obsolete. Selection of these parts does not resolve the original obsolescence issue and introduces cross-manufacturer supply chain complexity.

Frequently Asked Questions (FAQ)

Q: Can the MAX222CWN+ be used as a direct drop-in replacement?

A: Yes. The MAX222CWN+ is a parametric equivalent with identical electrical specifications and the same 18-SOIC package footprint. No circuit modifications are required. The primary benefits are active product status and ROHS3 compliance.

Q: What is the difference between receiver hysteresis values of 500 mV and 400 mV?

A: Receiver hysteresis determines the voltage differential required to switch logic states. Both 500 mV and 400 mV values meet RS232 protocol specifications. The 400 mV hysteresis in LT1080 and ADM222 series provides slightly faster response to marginal signal transitions while maintaining noise immunity. Selection depends on signal integrity requirements in the target application.

Q: Are the LT1080 and ADM222 series compatible with existing MAX222CWN circuit designs?

A: Yes. All substitute parts maintain the 2/2 full-duplex RS232 transceiver configuration, 4.5V ~ 5.5V supply voltage, and 18-SOIC package footprint. Pin assignments are identical. No PCB redesign is required. Extended operating temperature ranges in these parts provide additional design margin.

Q: What is the significance of packaging variants (Tube, Cut Tape, Tape & Reel)?

A: Packaging affects procurement and assembly processes. Tube packaging is suitable for low-volume manual assembly. Cut Tape (CT) and Tape & Reel (TR) packaging are optimized for automated pick-and-place assembly. Selection depends on production volume and assembly equipment capabilities. Electrical performance is identical across packaging variants.

Q: Why is RoHS3 compliance important for substitute selection?

A: RoHS3 compliance ensures the part meets current environmental and regulatory standards for hazardous substance restrictions. The original MAX222CWN is RoHS non-compliant, creating regulatory risk in new designs and updated systems. All recommended substitutes are ROHS3 compliant, eliminating this concern.

Q: Can the MAX222CWN be used in applications requiring extended temperature operation?

A: The MAX222CWN is rated for 0°C ~ 70°C operation. Applications requiring -40°C ~ 85°C operation must use LT1080ISW#TRPBF, LT1080ISW#PBF, ADM222ARZ, or ADM222ARZ-REEL. The LT1780CSW#TRPBF maintains the original 0°C ~ 70°C range if extended temperature is not required.

Q: What is the data rate difference between 250 kbps and 200 kbps?

A: Both data rates exceed typical RS232 communication requirements. The 250 kbps specification in MAX222CWN and LT1080 series provides additional margin for high-speed serial communication. The 200 kbps specification in ADM222 and MAX222CDWR series remains compliant with RS232 protocol. Selection depends on specific application bandwidth requirements.

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