DS232AS/T&R RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The DS232AS/T&R is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated in 16-SOIC surface mount packaging. This interface IC operates within the 4.5V to 5.5V supply voltage range and supports data rates up to 350 kbps with a receiver hysteresis of 500 mV. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility for RS232 communication applications.

Key Parameters

Parameter	DS232AS/T&R
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	2/2
Duplex	Full
Receiver Hysteresis	500 mV
Data Rate	350 kbps
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	16-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DS232AS/T&R is determined by the following critical parameters:

Protocol compatibility: RS232 full-duplex transceiver with 2/2 driver/receiver configuration
Supply voltage range: 4.5V to 5.5V operation
Mounting type: Surface mount 16-SOIC package
Operating temperature range: Extended industrial range (-40°C to 85°C) preferred for equivalent functionality
Data rate capability: Minimum 350 kbps to match original specification
Receiver hysteresis: 500 mV nominal specification

Substitute parts are grouped into two categories based on operational characteristics:

Category A - Full Parameter Match: Parts maintaining 500 mV receiver hysteresis, 350+ kbps data rate, and -40°C to 85°C operating range with 16-SOIC packaging.

Category B - Functional Equivalents: Parts with compatible RS232 2/2 transceiver architecture, 4.5V-5.5V supply, 16-SOIC packaging, but with variations in receiver hysteresis (400 mV or 650 mV), data rate (120-200 kbps), or operating temperature range (0°C to 70°C). These parts are suitable for applications where the specific parameter variations do not impact system requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Operating Temp	Package	RoHS Status	Packaging Type
DS232AS/T&R	Analog Devices Inc./Maxim Integrated	Obsolete	RS232	2/2	350 kbps	500 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	RoHS non-compliant	Tape & Reel
MAX232ACSE+	Analog Devices Inc./Maxim Integrated	Active	RS232	2/2	200 kbps	500 mV	0°C ~ 70°C	16-SOIC (0.154", 3.90mm)	ROHS3 Compliant	Tube
ADM232AARNZ	UMW	Active	RS232	2/2	120 kbps	Not specified	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm)	ROHS3 Compliant	Cut Tape & Digi-Reel
ADM232AARNZ-REEL	Analog Devices Inc.	Active	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm)	ROHS3 Compliant	Cut Tape & Digi-Reel
ADM232AARNZ-REEL7	Analog Devices Inc.	Active	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm)	ROHS3 Compliant	Cut Tape & Digi-Reel
ADM232AARWZ	Analog Devices Inc.	Active	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	ROHS3 Compliant	Tube
ADM232AARWZ-REEL	Analog Devices Inc.	Active	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	ROHS3 Compliant	Cut Tape & Digi-Reel
ADM232LARZ	Analog Devices Inc.	Active	RS232	2/2	120 kbps	650 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	ROHS3 Compliant	Tube
ADM232LARZ-REEL	Analog Devices Inc.	Active	RS232	2/2	120 kbps	650 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	ROHS3 Compliant	Cut Tape & Digi-Reel
ADM232LJRZ	Analog Devices Inc.	Active	RS232	2/2	120 kbps	650 mV	0°C ~ 70°C	16-SOIC (0.295", 7.50mm)	ROHS3 Compliant	Tube
ADM232LJRZ-REEL	Analog Devices Inc.	Active	RS232	2/2	120 kbps	650 mV	0°C ~ 70°C	16-SOIC (0.154", 3.90mm)	ROHS3 Compliant	Cut Tape & Digi-Reel

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete DS232AS/T&R. Selection should be based on specific application requirements:

For applications requiring extended industrial temperature operation (-40°C to 85°C) with standard packaging, ADM232AARWZ and ADM232AARWZ-REEL provide the closest functional match with 400 mV receiver hysteresis and 200 kbps data rate capability in the 16-SOIC (0.295", 7.50mm) package format matching the original part's physical dimensions.

For applications with commercial temperature range requirements (0°C to 70°C), MAX232ACSE+ offers active product status with 500 mV receiver hysteresis matching the original specification, though with reduced data rate (200 kbps) and smaller package dimensions (16-SOIC 0.154", 3.90mm).

For applications where receiver hysteresis tolerance is less critical and extended temperature operation is required, ADM232AARNZ-REEL and ADM232AARNZ-REEL7 provide 400 mV hysteresis with -40°C to 85°C operating range in compact 16-SOIC (0.154", 3.90mm) packaging.

For applications with lower data rate requirements and extended temperature operation, ADM232LARZ and ADM232LARZ-REEL offer 650 mV receiver hysteresis with 120 kbps data rate in both standard (0.295", 7.50mm) and compact (0.154", 3.90mm) package options.

Frequently Asked Questions (FAQ)

Q: Can MAX232ACSE+ directly replace DS232AS/T&R in all applications?

A: MAX232ACSE+ is functionally compatible as a 2/2 RS232 transceiver with matching 500 mV receiver hysteresis and 4.5V-5.5V supply voltage. However, it operates within 0°C to 70°C temperature range versus the original -40°C to 85°C range, and achieves 200 kbps data rate versus 350 kbps. Package dimensions differ (0.154" versus 0.295" width). Substitution is valid for applications within the specified temperature and data rate parameters.

Q: What is the significance of receiver hysteresis variation between substitute parts?

A: Receiver hysteresis determines the voltage differential required for input signal transitions. The original DS232AS/T&R specifies 500 mV. Substitute parts offer 400 mV (ADM232AAR series) or 650 mV (ADM232L series). Lower hysteresis (400 mV) provides faster response to marginal input signals; higher hysteresis (650 mV) provides greater noise immunity. Selection depends on signal integrity requirements in the target application.

Q: Are there package compatibility considerations when substituting?

A: Yes. The original DS232AS/T&R uses 16-SOIC (0.295", 7.50mm width) packaging. Substitute parts are available in both standard (0.295", 7.50mm) and compact (0.154", 3.90mm) 16-SOIC variants. Compact packages require PCB layout verification to confirm pad spacing compatibility. Standard-width packages (ADM232AARWZ, ADM232LARZ series) maintain original footprint dimensions.

Q: Which substitute part is recommended for new designs requiring RoHS compliance?

A: All listed substitute parts carry ROHS3 compliance status. For new designs, ADM232AARWZ or ADM232AARWZ-REEL are recommended for extended industrial temperature applications (-40°C to 85°C) with standard 16-SOIC packaging, providing active product status and established supply chain availability.

Q: What is the difference between Cut Tape & Digi-Reel and Tube packaging options?

A: Cut Tape & Digi-Reel packaging is suitable for automated pick-and-place assembly with reel-based component feeders. Tube packaging is used for manual assembly or lower-volume production. Both packaging types contain identical components; selection depends on assembly process requirements and production volume.

Q: Can ADM232AARNZ from UMW substitute for the Analog Devices DS232AS/T&R?

A: ADM232AARNZ is functionally compatible as a 2/2 RS232 transceiver with 4.5V-5.5V supply and -40°C to 85°C operating range. However, it specifies 120 kbps data rate versus the original 350 kbps, and receiver hysteresis is not specified. Substitution is valid for applications where 120 kbps data rate is sufficient and hysteresis specification is not critical.

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