MAX242CWN RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX242CWN is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in an 18-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The MAX242CWN operates within a 4.5V to 5.5V supply range with a 200 kbps data rate and 500 mV receiver hysteresis, making it suitable for legacy RS232 communication applications requiring dual driver and receiver channels.

Substiute Parts

MAX242CWN

Analog Devices Inc./Maxim IntegratedIn Stock: 1361MAX242CWN Datasheet

Current PartRFQ

MAX242CWN+

Analog Devices Inc./Maxim IntegratedIn Stock: 2175MAX242CWN+ Datasheet

Parametric EquivalentRFQ

ADM242ARZ

Analog Devices Inc.In Stock: 2122ADM242ARZ Datasheet

MFR RecommendedRFQ

ADM242ARZ-REEL

Analog Devices Inc.In Stock: 21322ADM242ARZ-REEL Datasheet

MFR RecommendedRFQ

LTC1384CSW#PBF

Analog Devices Inc.In Stock: 1935LTC1384CSW#PBF Datasheet

MFR RecommendedRFQ

LTC1384CSW#TRPBF

Analog Devices Inc.In Stock: 1960LTC1384CSW#TRPBF Datasheet

MFR RecommendedRFQ

LTC1384ISW#PBF

Analog Devices Inc.In Stock: 1243LTC1384ISW#PBF Datasheet

MFR RecommendedRFQ

LTC1384ISW#TRPBF

Analog Devices Inc.In Stock: 2736LTC1384ISW#TRPBF Datasheet

MFR RecommendedRFQ

MAX222CDW

Texas InstrumentsIn Stock: 1022MAX222CDW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAX242CWN are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

• RS232 protocol compliance
• 2/2 driver/receiver configuration (full duplex)
• 18-SOIC package footprint compatibility
• Surface mount mounting type
• Supply voltage range overlap (minimum 4.5V to 5.5V support)
• Data rate capability of 200 kbps or greater

Substitutes are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications and package dimensions, differing only in product status or compliance certifications.

Manufacturer Recommended Alternatives: Parts with minor parameter variations (such as receiver hysteresis, operating temperature range, or data rate) that remain functionally compatible within the MAX242CWN's operational envelope.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

MAX242CWN+ is the primary substitute, offering identical electrical specifications and package dimensions while maintaining active product status and ROHS3 compliance. This part represents a direct upgrade path from the obsolete MAX242CWN.

For Extended Temperature Range Applications:

ADM242ARZ and ADM242ARZ-REEL extend the operating temperature range to -40°C to 85°C, suitable for industrial or automotive environments. Both maintain 200 kbps data rate and full electrical compatibility. ADM242ARZ-REEL offers tape and reel packaging for high-volume procurement.

For Lower Data Rate Applications:

LTC1384 series parts (CSW and ISW variants) operate at 120 KBd, which is functionally compatible with the MAX242CWN's 200 kbps specification due to backward compatibility in RS232 communication. These parts are available in both commercial (0°C ~ 70°C) and industrial (-40°C ~ 85°C) temperature grades. Packaging options include tube (PBF) and tape & reel (TRPBF) formats.

For Cross-Manufacturer Compatibility:

MAX222CDW from Texas Instruments provides parametric equivalence with identical electrical specifications and package footprint. However, this part is also classified as obsolete, limiting its suitability for new designs requiring long-term availability.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing processes and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX242CWN+ be used as a direct replacement for MAX242CWN?

A: Yes. MAX242CWN+ is electrically and mechanically identical to MAX242CWN, with the primary differences being active product status and ROHS3 compliance certification. No design modifications are required.

Q: What is the difference between ADM242ARZ and ADM242ARZ-REEL?

A: Both parts are electrically identical. ADM242ARZ is supplied in tube packaging, while ADM242ARZ-REEL is supplied in tape and reel format. Selection depends on procurement volume and assembly line requirements. ADM242ARZ-REEL offers higher inventory availability (21,246 pcs vs. 2,100 pcs).

Q: Are LTC1384 parts compatible with MAX242CWN applications?

A: LTC1384 parts are functionally compatible for RS232 communication. The 120 KBd data rate is lower than MAX242CWN's 200 kbps specification, but RS232 communication is backward compatible at lower baud rates. The supply voltage range is slightly narrower (4.5V ~ 5V vs. 4.5V ~ 5.5V). Verify your application's maximum supply voltage before selection.

Q: What is the significance of receiver hysteresis differences?

A: MAX242CWN specifies 500 mV receiver hysteresis, while ADM242ARZ and LTC1384 series specify 400 mV. Both values meet RS232 specifications. The 400 mV hysteresis in alternative parts provides tighter noise margin definition, which is generally advantageous for signal integrity in noisy environments.

Q: Can I use MAX222CDW as a substitute?

A: MAX222CDW is parametrically equivalent but is classified as obsolete, similar to MAX242CWN. While it provides identical electrical and mechanical specifications, it does not solve the obsolescence issue. MAX242CWN+ or ADM242ARZ series are preferred for new designs.

Q: What packaging options are available for high-volume production?

A: ADM242ARZ-REEL (tape and reel) and LTC1384ISW#TRPBF (tape and reel) are optimized for automated assembly. Both offer the highest inventory availability and are suitable for production volumes requiring continuous tape supply.

Q: Are there temperature range considerations for my application?

A: MAX242CWN and MAX242CWN+ operate from 0°C to 70°C (commercial grade). If your application requires -40°C to 85°C operation, select ADM242ARZ, ADM242ARZ-REEL, LTC1384ISW#PBF, or LTC1384ISW#TRPBF (industrial grade).