DS232AS+ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The DS232AS+ is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated in a 16-SOIC surface mount package. This interface IC operates across the 4.5V to 5.5V supply range with a data rate of 350 kbps and receiver hysteresis of 500 mV. The DS232AS+ is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain compatibility across protocol, duplex configuration, driver/receiver count, supply voltage, and package specifications.

Key Parameters

Parameter	DS232AS+ Specification
Manufacturer	Analog Devices Inc./Maxim Integrated
Protocol	RS232
Type	Transceiver
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)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the DS232AS+ is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

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)
Package / Case: 16-SOIC with 0.295" (7.50mm) width (mandatory match for pin-compatible replacement)

Compatible Variation Parameters:

Data Rate: Substitute parts with equal or higher data rate capability are acceptable
Receiver Hysteresis: Variation permitted within standard RS232 specifications
Operating Temperature: Substitute parts with equal or wider temperature range are acceptable
Product Status: Active status preferred for long-term availability

Substitute parts are grouped by their adherence to these parameters. Parts meeting all critical parameters are direct functional equivalents.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Data Rate	Supply Voltage	Operating Temp	Package	Product Status
DS232AS+	Analog Devices Inc./Maxim Integrated	RS232	2/2	Full	350 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (7.50mm)	Obsolete
MAX232ACSE+	Analog Devices Inc./Maxim Integrated	RS232	2/2	Full	200 kbps	4.5V ~ 5.5V	0°C ~ 70°C	16-SOIC (3.90mm)	Active
ADM232AARNZ	UMW	RS232	2/2	Full	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOP (3.90mm)	Active
ADM232AARNZ-REEL	Analog Devices Inc.	RS232	2/2	Full	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (3.90mm)	Active
ADM232AARNZ-REEL7	Analog Devices Inc.	RS232	2/2	Full	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (3.90mm)	Active
ADM232AARWZ	Analog Devices Inc.	RS232	2/2	Full	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (7.50mm)	Active
ADM232AARWZ-REEL	Analog Devices Inc.	RS232	2/2	Full	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (7.50mm)	Active
ADM232LARZ	Analog Devices Inc.	RS232	2/2	Full	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (7.50mm)	Active
ADM232LARZ-REEL	Analog Devices Inc.	RS232	2/2	Full	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	16-SOIC (7.50mm)	Active
ADM232LJRZ	Analog Devices Inc.	RS232	2/2	Full	120 kbps	4.5V ~ 5.5V	0°C ~ 70°C	16-SOIC (7.50mm)	Active
ADM232LJRZ-REEL	Analog Devices Inc.	RS232	2/2	Full	120 kbps	4.5V ~ 5.5V	0°C ~ 70°C	16-SOIC (3.90mm)	Active

Engineering Selection Recommendations

Primary Substitutes (Matching Package Width):

ADM232AARWZ and ADM232AARWZ-REEL are the closest functional equivalents to DS232AS+. Both maintain the 16-SOIC package with 0.295" (7.50mm) width, ensuring direct PCB compatibility. These parts are manufactured by Analog Devices Inc., carry ROHS3 compliance, and hold active product status. Operating temperature range matches the original specification (-40°C ~ 85°C). Data rate of 200 kbps is lower than the original 350 kbps but remains within acceptable RS232 transceiver performance parameters.

ADM232LARZ and ADM232LARZ-REEL also match the 7.50mm package width and maintain full compatibility with supply voltage and operating temperature specifications. These variants operate at 120 kbps data rate and feature 650 mV receiver hysteresis compared to the original 500 mV.

Secondary Substitutes (Alternate Package Width):

ADM232AARNZ-REEL and ADM232AARNZ-REEL7 provide functional equivalence with 16-SOIC packaging at 3.90mm width. These require PCB layout verification for pin spacing compatibility. Both maintain -40°C ~ 85°C operating temperature and 4.5V ~ 5.5V supply voltage specifications.

MAX232ACSE+ is an active Analog Devices product but operates within a narrower temperature range (0°C ~ 70°C) and features a 3.90mm package width, requiring design review for thermal and spatial constraints.

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and moisture handling compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can ADM232AARWZ directly replace DS232AS+ without PCB modification?

A: Yes. ADM232AARWZ maintains identical 16-SOIC package dimensions (0.295", 7.50mm width), supply voltage range (4.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), and 2/2 full-duplex RS232 transceiver configuration. Pin-to-pin compatibility is assured. The 200 kbps data rate is lower than the original 350 kbps but operates within standard RS232 specifications.

Q: What is the difference between ADM232AARWZ and ADM232AARWZ-REEL?

A: Both parts are electrically identical. The difference is packaging format: ADM232AARWZ is supplied in Tube packaging, while ADM232AARWZ-REEL is supplied in Cut Tape with Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Why do some substitutes have lower data rates (120 kbps vs. 350 kbps)?

A: RS232 protocol operation is not limited by transceiver data rate rating alone. Lower-rated transceivers function in applications with lower baud rates. If your application requires 350 kbps operation, select substitutes with 200 kbps or higher ratings (ADM232AARWZ, ADM232AARNZ-REEL, ADM232AARNZ-REEL7, MAX232ACSE+).

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original DS232AS+ specification.

Q: Can I use MAX232ACSE+ in applications requiring -40°C operation?

A: No. MAX232ACSE+ operates within 0°C ~ 70°C temperature range. For applications requiring -40°C ~ 85°C operation, select ADM232AARWZ, ADM232AARWZ-REEL, ADM232AARNZ-REEL, ADM232AARNZ-REEL7, ADM232LARZ, or ADM232LARZ-REEL.

Q: What is the significance of receiver hysteresis variation (400 mV, 500 mV, 650 mV)?

A: Receiver hysteresis affects noise immunity and signal transition characteristics. The original DS232AS+ specifies 500 mV. Substitutes with 400 mV (ADM232AARNZ-REEL variants) provide tighter hysteresis, while 650 mV variants (ADM232LARZ series) provide wider hysteresis. Selection depends on signal integrity requirements in your specific application environment.

Q: Is ADM232AARNZ (16-SOP package) compatible with DS232AS+ (16-SOIC)?

A: No. While both are 16-pin packages, SOP and SOIC have different pin spacing and physical dimensions. PCB layout modification is required. Verify footprint compatibility before selection.

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