DS232AS-N RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The DS232AS-N 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 part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and functional performance parameters.

Key Parameters

Parameter	DS232AS-N
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 eligibility for the DS232AS-N is determined by the following critical 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 (mandatory match for pin compatibility)

Substitute parts are grouped into two categories based on operating temperature range and receiver hysteresis specifications. The primary substitutes maintain the -40°C ~ 85°C operating temperature range of the original part, while secondary substitutes operate within the 0°C ~ 70°C range. Data rate variations are acceptable provided the substitute meets or exceeds the minimum operational requirements. RoHS3 compliance is available across all active substitute options, addressing the non-compliant status of the obsolete DS232AS-N.

Parameter Comparison

Parameter	DS232AS-N	MAX232ACSE+	ADM232AARNZ	ADM232AARNZ-REEL	ADM232AARWZ	ADM232AARWZ-REEL	ADM232LARZ	ADM232LARZ-REEL	ADM232LJRZ	ADM232LJRZ-REEL
Type	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver	Transceiver
Protocol	RS232	RS232	RS232	RS232	RS232	RS232	RS232	RS232	RS232	RS232
Number of Drivers/Receivers	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2	2/2
Duplex	Full	Full	Full	Full	Full	Full	Full	Full	Full	Full
Receiver Hysteresis	500 mV	500 mV	Not specified	400 mV	400 mV	400 mV	650 mV	650 mV	650 mV	650 mV
Data Rate	350 kbps	200 kbps	120 kbps	200 kbps	200 kbps	200 kbps	120 kbps	120 kbps	120 kbps	120 kbps
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.295", 7.50mm Width)	16-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance, addressing the obsolete and non-compliant status of the DS232AS-N. Selection should prioritize parts matching the original 16-SOIC (0.295", 7.50mm Width) package footprint to minimize PCB layout modifications.

For applications requiring the full -40°C ~ 85°C operating temperature range, the ADM232AARNZ-REEL, ADM232AARWZ, ADM232AARWZ-REEL, ADM232LARZ, and ADM232LARZ-REEL variants are suitable. The ADM232AARWZ and ADM232AARWZ-REEL series provide 400 mV receiver hysteresis with 200 kbps data rate performance. The ADM232LARZ and ADM232LARZ-REEL series offer 650 mV receiver hysteresis with 120 kbps data rate.

For applications with relaxed temperature requirements (0°C ~ 70°C), the MAX232ACSE+ and ADM232LJRZ/ADM232LJRZ-REEL options are available. The MAX232ACSE+ maintains 500 mV receiver hysteresis matching the original part specification.

Packaging format selection between tube and cut tape/digi-reel options depends on procurement and assembly requirements. All substitute parts maintain electrical compatibility with the DS232AS-N across the mandatory RS232 protocol, 2/2 driver/receiver configuration, full-duplex operation, and 4.5V ~ 5.5V supply voltage range.

Frequently Asked Questions (FAQ)

Q: Can the MAX232ACSE+ directly replace the DS232AS-N in existing designs?

A: The MAX232ACSE+ matches the core electrical specifications (RS232 protocol, 2/2 configuration, full-duplex, 4.5V ~ 5.5V supply, 500 mV receiver hysteresis). However, it operates within 0°C ~ 70°C temperature range versus the original -40°C ~ 85°C range. PCB layout modification is required due to package width difference (0.154" versus 0.295"). Verify application temperature requirements before selection.

Q: What is the difference between ADM232AARWZ and ADM232LARZ variants?

A: Both operate across -40°C ~ 85°C and use the 16-SOIC (0.295", 7.50mm Width) package. The ADM232AARWZ provides 400 mV receiver hysteresis with 200 kbps data rate. The ADM232LARZ provides 650 mV receiver hysteresis with 120 kbps data rate. Selection depends on application hysteresis and data rate requirements.

Q: Are tube and cut tape/digi-reel packaging options electrically equivalent?

A: Yes. Tube and cut tape/digi-reel packaging options for the same part number (e.g., ADM232AARWZ versus ADM232AARWZ-REEL) are electrically identical. Packaging selection is determined by procurement volume, assembly equipment compatibility, and inventory management practices.

Q: Why do some substitutes have lower data rates than the DS232AS-N?

A: The DS232AS-N operates at 350 kbps, while several substitutes operate at 200 kbps or 120 kbps. These lower data rates remain compatible with RS232 protocol requirements and typical serial communication applications. Verify application data rate requirements before selection. Higher-performance substitutes (200 kbps) are available if needed.

Q: What is the significance of RoHS3 compliance for substitute selection?

A: The DS232AS-N is RoHS non-compliant. All listed substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and manufacturing. This compliance status is mandatory for many OEM and end-customer applications.

Q: Can substitutes with 16-SOIC (0.154", 3.90mm Width) packages be used in place of the original 16-SOIC (0.295", 7.50mm Width)?

A: Pin compatibility exists between both 16-SOIC package widths. However, PCB footprint modifications are required. The narrower 0.154" package requires a different land pattern than the 0.295" package. Evaluate PCB redesign feasibility and assembly process compatibility before selecting narrow-body alternatives.

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