MAX232ECDWR RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX232ECDWR is a 2/2 full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This interface IC operates within the 4.5V to 5.5V supply voltage range and supports data rates up to 250 kbps with a 500 mV receiver hysteresis specification. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	MAX232ECDWR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	250 kbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.295", 7.50mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX232ECDWR is determined by strict equivalence across the following critical parameters:

RS232 protocol compliance with 2/2 driver/receiver configuration
Full-duplex operation capability
Supply voltage range: 4.5V ~ 5.5V
Surface mount package type with 16-pin SOIC footprint
ROHS3 compliance and MSL 1 rating
Data rate support (minimum 250 kbps for direct equivalence; 120 kbps acceptable for parametric equivalence)
Operating temperature range (0°C ~ 70°C for direct match; -40°C ~ 85°C for enhanced specification)

Substitute parts are grouped into three categories: MFR Recommended (active status, enhanced specifications), Parametric Equivalent (matching electrical parameters, may have different product status), and Direct Equivalent (same base product number, different packaging or temperature rating).

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Data Rate	Operating Temp	Package	Receiver Hysteresis	Packaging Type
MAX232ECDWR	Texas Instruments	Obsolete	RS232	2/2	250 kbps	0°C ~ 70°C	16-SOIC (0.295")	500 mV	Cut Tape & Digi-Reel
TRS232EIDWR	Texas Instruments	Active	RS232	2/2	250 kbps	-40°C ~ 85°C	16-SOIC (0.295")	500 mV	Tape & Reel
TRS232ECDWR	Texas Instruments	Obsolete	RS232	2/2	250 kbps	0°C ~ 70°C	16-SOIC (0.295")	500 mV	Cut Tape & Digi-Reel
MAX232ECWE+	Analog Devices Inc./Maxim Integrated	Active	RS232	2/2	120 kbps	0°C ~ 70°C	16-SOIC (0.295")	500 mV	Tube
MAX232ECWE+T	Analog Devices Inc./Maxim Integrated	Active	RS232	2/2	120 kbps	0°C ~ 70°C	16-SOIC (0.295")	500 mV	Cut Tape & Digi-Reel
ADM232AARNZ	UMW	Active	RS232	2/2	120 kbps	-40°C ~ 85°C	16-SOP (0.154")	Not specified	Cut Tape & Digi-Reel
ADM232AARNZ-REEL	Analog Devices Inc.	Active	RS232	2/2	200 kbps	-40°C ~ 85°C	16-SOIC (0.154")	400 mV	Cut Tape & Digi-Reel
ADM232AARNZ-REEL7	Analog Devices Inc.	Active	RS232	2/2	200 kbps	-40°C ~ 85°C	16-SOIC (0.154")	400 mV	Cut Tape & Digi-Reel
ADM232AARWZ	Analog Devices Inc.	Active	RS232	2/2	200 kbps	-40°C ~ 85°C	16-SOIC (0.295")	400 mV	Tube
ADM232AARWZ-REEL	Analog Devices Inc.	Active	RS232	2/2	200 kbps	-40°C ~ 85°C	16-SOIC (0.295")	400 mV	Cut Tape & Digi-Reel
ADM232LARZ	Analog Devices Inc.	Active	RS232	2/2	120 kbps	-40°C ~ 85°C	16-SOIC (0.295")	650 mV	Tube

Engineering Selection Recommendations

For applications requiring direct replacement of the MAX232ECDWR with active product status and identical electrical specifications, the TRS232EIDWR is the primary recommendation. This part maintains the same 2/2 RS232 transceiver configuration, 250 kbps data rate, and 500 mV receiver hysteresis while offering an extended operating temperature range of -40°C to 85°C. Both parts are ROHS3 compliant with MSL 1 rating.

For designs where extended temperature operation is not required but active product status is essential, the MAX232ECWE+T provides continuity with the MAX232 base product number from Analog Devices Inc./Maxim Integrated. This part operates at 120 kbps, which is within the RS232 protocol capability range, though below the original 250 kbps specification. It is available in Cut Tape & Digi-Reel packaging and maintains ROHS3 compliance.

The ADM232 series from Analog Devices Inc. offers enhanced specifications with -40°C to 85°C operating temperature range and 200 kbps data rate capability. The ADM232AARWZ-REEL variant provides the closest mechanical compatibility with the original 16-SOIC (0.295") package footprint while delivering improved thermal performance and higher data rate support.

All recommended substitutes maintain full RS232 protocol compliance, 2/2 driver/receiver configuration, 4.5V to 5.5V supply voltage range, and ROHS3 certification. Selection should be based on specific application requirements for operating temperature range, data rate, and packaging format.

Frequently Asked Questions (FAQ)

Q: Can the MAX232ECDWR be directly replaced with the TRS232EIDWR?

A: Yes. Both parts share identical electrical specifications for RS232 protocol, 2/2 transceiver configuration, 250 kbps data rate, and 500 mV receiver hysteresis. The TRS232EIDWR offers extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and active product status. The primary difference is packaging format: TRS232EIDWR uses Tape & Reel while MAX232ECDWR uses Cut Tape & Digi-Reel.

Q: What is the difference between parametric equivalents and direct equivalents?

A: Direct equivalents maintain identical electrical parameters and base product number. Parametric equivalents meet the core functional requirements (RS232 2/2 transceiver, full-duplex, 4.5V-5.5V supply) but may differ in data rate, receiver hysteresis, or operating temperature range. All listed parts are functionally compatible for RS232 communication applications.

Q: Does the ADM232AARNZ-REEL have the same package footprint as the MAX232ECDWR?

A: No. The ADM232AARNZ-REEL uses a 16-SOIC package with 0.154" width, while the MAX232ECDWR uses 16-SOIC with 0.295" width. These are different physical footprints and are not pin-compatible on the same PCB layout. The ADM232AARWZ-REEL and ADM232AARWZ variants use the 0.295" width package and are mechanically compatible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory specifications of the original MAX232ECDWR.

Q: What is the significance of the 500 mV receiver hysteresis specification?

A: Receiver hysteresis determines the noise immunity and switching threshold characteristics of the RS232 input stage. The MAX232ECDWR specifies 500 mV hysteresis. Most direct substitutes (TRS232EIDWR, TRS232ECDWR, MAX232ECWE+, MAX232ECWE+T) maintain this specification. The ADM232 series specifies 400 mV hysteresis, which provides tighter threshold control and is functionally compatible for standard RS232 applications.

Q: Can I use a 120 kbps rated part in place of the 250 kbps MAX232ECDWR?

A: The MAX232ECWE+ and ADM232LARZ are rated for 120 kbps operation. RS232 protocol supports data rates up to 115.2 kbps in standard applications. These parts are functionally suitable for typical RS232 communication but do not match the original 250 kbps specification. Use only if your application operates at or below 120 kbps.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in Cut Tape & Digi-Reel, Tape & Reel, and Tube packaging formats. The MAX232ECDWR uses Cut Tape & Digi-Reel. For identical packaging, select TRS232ECDWR or MAX232ECWE+T. For active product status with Cut Tape & Digi-Reel format, the TRS232EIDWR (Tape & Reel) or ADM232AARWZ-REEL (Cut Tape & Digi-Reel) are available.

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