MAX3232IDR Equivalent & Substitute Parts

Part Overview

The MAX3232IDR is a 2/2 transceiver full RS232 interface IC manufactured by Texas Instruments in a 16-SOIC package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The MAX3232IDR operates across a 3V to 5.5V supply voltage range with a 250kbps data rate and full-duplex RS232 protocol support, making it suitable for legacy serial communication applications requiring direct replacement or functional equivalence.

Key Parameters

Parameter	MAX3232IDR Specification
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	300 mV
Data Rate	250kbps
Voltage - Supply	3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX3232IDR is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Protocol: RS232
Number of Drivers/Receivers: 2/2
Duplex: Full
Voltage Supply Range: 3V ~ 5.5V
Operating Temperature Range: -40°C ~ 85°C
Mounting Type: Surface Mount
Package Type: 16-SOIC with 0.154" (3.90mm) width

Secondary Compatibility Parameters:

Receiver Hysteresis: 300 mV (primary specification); 400 mV or 500 mV acceptable within RS232 protocol tolerances
Data Rate: 250kbps minimum; higher rates (460kbps, 235kbps) maintain backward compatibility

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents (Active Status): Parts with identical electrical specifications and package dimensions. These include MAX3232EIDR and TRS3232EIDR from Texas Instruments, both maintaining the exact 300 mV receiver hysteresis and 250kbps data rate.

Category 2 - Manufacturer Recommended Alternatives (Active Status): Parts from Analog Devices Inc. (ADM3202 series) and UMW (ADM3232 series) that maintain core RS232 2/2 transceiver functionality with the same supply voltage and temperature range. These parts feature enhanced data rates (460kbps) and alternative receiver hysteresis values (400 mV or 500 mV), which remain within RS232 specification compliance.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Packaging Type
MAX3232IDR	Texas Instruments	Obsolete	RS232	2/2	300 mV	250kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
MAX3232EIDR	Texas Instruments	Active	RS232	2/2	300 mV	250kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
TRS3232EIDR	Texas Instruments	Active	RS232	2/2	300 mV	250kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
ADM3202ARNZ	Analog Devices Inc.	Active	RS232	2/2	400 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Tube
ADM3202ARNZ-REEL	Analog Devices Inc.	Active	RS232	2/2	400 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
ADM3202ARNZ-REEL7	Analog Devices Inc.	Active	RS232	2/2	400 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
ADM3202ARWZ	Analog Devices Inc.	Active	RS232	2/2	400 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.295")	Tube
ADM3202ARWZ-REEL	Analog Devices Inc.	Active	RS232	2/2	400 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.295")	Cut Tape (CT) & Digi-Reel®
ADM3202ARWZ-REEL7	Analog Devices Inc.	Active	RS232	2/2	400 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.295")	Tape & Reel (TR)
ADM3232EARNZ	UMW	Active	RS232	2/2	300 mV	235kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®
ADM3232EARNZ-REEL7	Analog Devices Inc.	Active	RS232	2/2	500 mV	460kbps	3V ~ 5.5V	-40°C ~ 85°C	16-SOIC (0.154")	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): MAX3232EIDR and TRS3232EIDR are active-status direct replacements for the obsolete MAX3232IDR. Both maintain identical electrical specifications (300 mV receiver hysteresis, 250kbps data rate) and package dimensions (16-SOIC 0.154" width). These parts require no circuit redesign and provide pin-for-pin compatibility. TRS3232EIDR offers significantly higher inventory availability (634,478 pcs) compared to MAX3232EIDR (17,600 pcs).

Alternative Substitutes (Enhanced Performance): ADM3202 series parts from Analog Devices Inc. provide enhanced data rates (460kbps) and maintain full RS232 2/2 transceiver functionality within the same supply voltage and temperature operating ranges. The 400 mV receiver hysteresis specification remains within RS232 protocol compliance. Package width variants exist: 0.154" (standard) and 0.295" (wide). Packaging options include Tube, Cut Tape & Digi-Reel®, and Tape & Reel formats. ADM3202ARNZ-REEL offers the highest inventory (44,100 pcs) among Analog Devices variants.

Secondary Alternative (UMW Source): ADM3232EARNZ from UMW maintains the 300 mV receiver hysteresis specification with a 235kbps data rate, suitable for applications not requiring maximum data throughput. This part provides geographic supply diversification.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), REACH Unaffected status, and EAR99 export classification, matching the original MAX3232IDR specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX3232EIDR directly replace MAX3232IDR without circuit modifications? A: Yes. MAX3232EIDR is a parametric equivalent with identical electrical specifications and 16-SOIC package dimensions. No circuit redesign is required.

Q: What is the difference between ADM3202ARNZ and ADM3202ARWZ? A: Both are Analog Devices ADM3202 series parts with identical electrical specifications (400 mV hysteresis, 460kbps data rate). The primary difference is package width: ARNZ uses 0.154" width (standard 16-SOIC), while ARWZ uses 0.295" width (wide 16-SOIC). Verify PCB footprint compatibility before selection.

Q: Are ADM3202 parts compatible with MAX3232IDR applications? A: ADM3202 parts maintain RS232 2/2 transceiver functionality, supply voltage range (3V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The 400 mV receiver hysteresis and 460kbps data rate are within RS232 specification tolerances. Electrical compatibility is confirmed; verify application-specific timing requirements.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in Tube, Cut Tape & Digi-Reel®, and Tape & Reel formats. Select based on production volume and assembly process requirements. Cut Tape & Digi-Reel® packaging is standard for high-volume surface mount assembly.

Q: Does the UMW ADM3232EARNZ offer the same performance as Texas Instruments parts? A: ADM3232EARNZ maintains 300 mV receiver hysteresis matching the original MAX3232IDR, but operates at 235kbps data rate compared to 250kbps. This part is suitable for applications with lower data rate requirements and provides alternative supply chain sourcing.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the original MAX3232IDR environmental specifications.

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