DS232AS-NTR Equivalent & Substitute Parts

Part Overview

The DS232AS-NTR is a 2/2 transceiver full RS232 interface IC manufactured by Analog Devices Inc./Maxim Integrated in a 16-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates across a supply voltage range of 4.5V to 5.5V with a receiver hysteresis of 500 mV and supports data rates up to 350 kbps. Its RoHS non-compliant status further necessitates evaluation of modern alternatives that meet current regulatory requirements.

Key Parameters

Parameter	DS232AS-NTR Value
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)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DS232AS-NTR is determined by strict equivalence in the following critical parameters:

Protocol: RS232 full duplex transceiver
Configuration: 2/2 drivers and receivers
Supply voltage range: 4.5V ~ 5.5V
Mounting type: Surface mount
Package type: 16-SOIC
Receiver hysteresis: 400 mV to 650 mV (acceptable variance)
Data rate: Minimum 120 kbps (DS232AS-NTR operates at 350 kbps)
Operating temperature: -40°C ~ 85°C or 0°C ~ 70°C (depending on application requirements)

The substitute parts listed below maintain functional equivalence across these parameters while offering improved regulatory compliance (RoHS3 compliant) and active product status.

Parameter Comparison

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

Engineering Selection Recommendations

All listed substitute parts maintain functional equivalence as RS232 2/2 full duplex transceivers with 16-SOIC packaging and 4.5V to 5.5V supply voltage operation. Selection between substitutes depends on specific application requirements:

For applications requiring the original operating temperature range of -40°C to 85°C with matching package dimensions (0.295", 7.50mm width), ADM232AARWZ, ADM232AARWZ-REEL, ADM232LARZ, and ADM232LARZ-REEL are direct mechanical and thermal equivalents. These parts are manufactured by Analog Devices Inc. and carry ROHS3 compliance.

For applications with relaxed temperature requirements (0°C to 70°C), MAX232ACSE+ and ADM232LJRZ offer active product status with full regulatory compliance. MAX232ACSE+ features a narrower package width (0.154", 3.90mm) suitable for space-constrained layouts.

For applications requiring the extended operating temperature range (-40°C to 85°C) with compact package dimensions (0.154", 3.90mm width), ADM232AARNZ-REEL and ADM232AARNZ-REEL7 provide optimal compatibility. The ADM232AARNZ variant from UMW offers the same electrical specifications with alternative sourcing.

All substitute parts are currently in active production status with ROHS3 compliance, addressing the regulatory limitations of the obsolete DS232AS-NTR.

Frequently Asked Questions (FAQ)

Q: Can MAX232ACSE+ directly replace DS232AS-NTR in all applications?

A: MAX232ACSE+ maintains electrical equivalence in protocol, driver/receiver configuration, and supply voltage. However, its operating temperature range is limited to 0°C to 70°C compared to DS232AS-NTR's -40°C to 85°C. Package dimensions also differ (0.154" vs 0.295" width). Substitution is valid only for applications within the narrower temperature range and where PCB layout accommodates the smaller package.

Q: What is the difference between ADM232AARNZ and ADM232AARNZ-REEL variants?

A: Both parts are electrically identical RS232 2/2 transceivers with identical electrical specifications. The difference lies in packaging format: ADM232AARNZ is supplied in Cut Tape (CT) & Digi-Reel format, while ADM232AARNZ-REEL and ADM232AARNZ-REEL7 are also supplied in Cut Tape & 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: The ADM232 series variants with 120 kbps data rates (ADM232LARZ, ADM232LARZ-REEL, ADM232LJRZ, ADM232LJRZ-REEL) remain functionally equivalent for RS232 protocol operation. RS232 applications typically operate well below maximum rated data rates. These parts are suitable substitutes provided the application's actual data rate requirement does not exceed 120 kbps.

Q: Which substitute offers the best inventory availability?

A: ADM232LJRZ provides the highest inventory level at 24,596 pieces in stock. For reel packaging, ADM232AARNZ-REEL and ADM232LARZ-REEL offer 5,200 and 5,200 pieces respectively.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, addressing the RoHS non-compliant status of the obsolete DS232AS-NTR.

Q: What package width should I select for PCB layout compatibility?

A: The DS232AS-NTR uses 16-SOIC with 0.295" (7.50mm) width. Direct mechanical equivalents maintaining this width are ADM232AARWZ, ADM232AARWZ-REEL, ADM232LARZ, ADM232LARZ-REEL, and ADM232LJRZ. Compact alternatives with 0.154" (3.90mm) width include MAX232ACSE+, ADM232AARNZ, ADM232AARNZ-REEL, ADM232AARNZ-REEL7, and ADM232LJRZ-REEL, which require PCB layout modification.

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