DS232AS RS232 Transceiver Interface IC Equivalent & Substitute Parts

Part Overview

The DS232AS is a 2/2 full-duplex RS232 transceiver interface IC manufactured by Analog Devices Inc./Maxim Integrated in a 16-SOIC surface mount package. This component is classified as obsolete, with 5859 units currently in stock. The DS232AS operates across a 4.5V to 5.5V supply voltage range and supports data rates up to 350 kbps with a 500 mV receiver hysteresis specification. Due to its obsolete product status and non-RoHS compliance, equivalent substitute parts with active product status and modern compliance certifications are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	DS232AS Specification
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 is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Requirements:

Protocol: RS232 (mandatory match)
Number of Drivers/Receivers: 2/2 (mandatory match)
Duplex: Full (mandatory match)
Voltage - Supply: 4.5V ~ 5.5V (mandatory match)
Mounting Type: Surface Mount (mandatory match)

Mechanical Compatibility Requirements:

Package / Case: 16-SOIC form factor (mandatory match)
Supplier Device Package: 16-SOIC or 16-SOP (compatible variants)

Performance Parameters (Allowable Variation):

Data Rate: Substitute must meet or exceed 350 kbps requirement
Receiver Hysteresis: Substitute specifications between 400 mV and 650 mV are acceptable
Operating Temperature: Substitute must support -40°C ~ 85°C or equivalent industrial range

Compliance Parameters:

RoHS Status: Active substitutes must be ROHS3 compliant
Product Status: Active product status preferred for supply chain continuity

All substitute parts listed below meet these mandatory electrical and mechanical criteria while offering improved compliance and active product availability.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Operating Temp	Package	Product Status	RoHS Status	Inventory
DS232AS	Analog Devices Inc./Maxim Integrated	RS232	2/2	350 kbps	500 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Obsolete	RoHS non-compliant	5859 Pcs
MAX232ACSE+	Analog Devices Inc./Maxim Integrated	RS232	2/2	200 kbps	500 mV	0°C ~ 70°C	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant	1302 Pcs
ADM232AARNZ	UMW	RS232	2/2	120 kbps	Not specified	-40°C ~ 85°C	16-SOP	Active	ROHS3 Compliant	2453 Pcs
ADM232AARNZ-REEL	Analog Devices Inc.	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant	4793 Pcs
ADM232AARNZ-REEL7	Analog Devices Inc.	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant	4200 Pcs
ADM232AARWZ	Analog Devices Inc.	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant	5200 Pcs
ADM232AARWZ-REEL	Analog Devices Inc.	RS232	2/2	200 kbps	400 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant	3160 Pcs
ADM232LARZ	Analog Devices Inc.	RS232	2/2	120 kbps	650 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant	1110 Pcs
ADM232LARZ-REEL	Analog Devices Inc.	RS232	2/2	120 kbps	650 mV	-40°C ~ 85°C	16-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant	5200 Pcs
ADM232LJRZ	Analog Devices Inc.	RS232	2/2	120 kbps	650 mV	0°C ~ 70°C	16-SOIC (0.295", 7.50mm)	Active	ROHS3 Compliant	24596 Pcs
ADM232LJRZ-REEL	Analog Devices Inc.	RS232	2/2	120 kbps	650 mV	0°C ~ 70°C	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant	8577 Pcs

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): ADM232AARWZ and ADM232AARWZ-REEL are the preferred substitutes for the DS232AS. Both parts maintain the identical 16-SOIC (0.295", 7.50mm Width) package footprint, support the full -40°C ~ 85°C operating temperature range, and are manufactured by Analog Devices Inc. with ROHS3 compliance and active product status. The 400 mV receiver hysteresis specification falls within acceptable tolerance of the original 500 mV specification.

Alternative Substitutes (Package Footprint Variation): ADM232AARNZ-REEL and ADM232AARNZ-REEL7 provide equivalent electrical functionality with a smaller 16-SOIC (0.154", 3.90mm Width) package footprint. These parts are suitable for designs where PCB space optimization is required. Both maintain full -40°C ~ 85°C temperature range support and ROHS3 compliance.

Temperature-Constrained Applications: For applications limited to 0°C ~ 70°C operating range, ADM232LJRZ and ADM232LJRZ-REEL offer the highest inventory availability (24596 and 8577 units respectively) with ROHS3 compliance and active product status. These parts feature 650 mV receiver hysteresis and 120 kbps data rate specifications.

Compliance Advantage: All substitute parts listed are ROHS3 compliant and carry active product status, eliminating the supply chain and regulatory risks associated with the obsolete, non-RoHS-compliant DS232AS.

Frequently Asked Questions (FAQ)

Q: Can the ADM232AARNZ substitute for the DS232AS in existing designs without PCB modification? A: The ADM232AARNZ uses a 16-SOP package variant, which differs from the DS232AS 16-SOIC package. PCB footprint modification is required. For direct footprint compatibility without PCB changes, use ADM232AARWZ or ADM232AARWZ-REEL, which maintain the 16-SOIC (0.295", 7.50mm Width) package.

Q: What is the impact of the 400 mV receiver hysteresis in ADM232AARNZ-REEL compared to the DS232AS 500 mV specification? A: The 400 mV hysteresis in the ADM232AARNZ-REEL provides tighter noise margin specifications than the original 500 mV. This is functionally acceptable for RS232 applications and represents an improvement in signal integrity for most industrial and commercial implementations.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, eliminating regulatory compliance risks associated with the non-RoHS-compliant DS232AS.

Q: Which substitute offers the best inventory availability? A: ADM232LJRZ provides the highest inventory level at 24596 units. This part is suitable for applications operating within the 0°C ~ 70°C temperature range and offers ROHS3 compliance with active product status.

Q: What is the difference between tube and reel packaging options? A: Tube packaging (ADM232AARWZ, ADM232LARZ, ADM232LJRZ) is suitable for lower-volume applications and manual assembly processes. Cut Tape & Digi-Reel packaging (REEL variants) is optimized for automated pick-and-place assembly and higher-volume production environments. Electrical specifications remain identical across packaging variants.

Q: Can I use MAX232ACSE+ as a substitute for the DS232AS? A: MAX232ACSE+ is electrically compatible as a 2/2 full-duplex RS232 transceiver with 4.5V ~ 5.5V supply voltage. However, it features a smaller 16-SOIC (0.154", 3.90mm Width) package footprint and operates within a narrower 0°C ~ 70°C temperature range. PCB footprint modification is required, and temperature range limitations must be evaluated for your application.

Q: What data rate performance should I expect from substitute parts? A: The DS232AS supports 350 kbps. Most ADM232 substitutes operate at 200 kbps or 120 kbps. For applications requiring the full 350 kbps data rate capability of the original part, verify that your communication protocol does not exceed the substitute part's maximum data rate specification before implementation.

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