DS232AS-NTR+ RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The DS232AS-NTR+ is a 2/2 full-duplex RS232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-SOIC package. This interface IC operates across the 4.5V to 5.5V supply range with a 350 kbps data rate and 500 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility across electrical specifications, mechanical packaging, and operational parameters.

Key Parameters

Parameter	DS232AS-NTR+
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS232
Drivers/Receivers	2/2
Duplex	Full
Data Rate	350 kbps
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Receiver Hysteresis	500 mV
Package/Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

RS232 protocol compliance (mandatory)
2/2 driver/receiver configuration (mandatory)
Full-duplex operation (mandatory)
Supply voltage range 4.5V ~ 5.5V (mandatory)
16-SOIC package form factor (mandatory for direct replacement)
Operating temperature range compatibility
Data rate capability (minimum 350 kbps required for DS232AS-NTR+ replacement)
Receiver hysteresis tolerance
RoHS3 compliance and MSL rating

Substitute parts are grouped by package width variant (0.154" vs 0.295") and operating temperature range. Parts with narrower package widths (0.154", 3.90mm) require PCB layout verification. Parts with restricted temperature ranges (0°C ~ 70°C) are suitable only for commercial-grade applications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package Width	Product Status
DS232AS-NTR+	Analog Devices/Maxim	RS232	2/2	350 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	500 mV	0.295" (7.50mm)	Obsolete
MAX232ACSE+	Analog Devices/Maxim	RS232	2/2	200 kbps	4.5V ~ 5.5V	0°C ~ 70°C	500 mV	0.154" (3.90mm)	Active
ADM232AARNZ	UMW	RS232	2/2	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	Not specified	0.154" (3.90mm)	Active
ADM232AARNZ-REEL	Analog Devices	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	400 mV	0.154" (3.90mm)	Active
ADM232AARNZ-REEL7	Analog Devices	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	400 mV	0.154" (3.90mm)	Active
ADM232AARWZ	Analog Devices	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	400 mV	0.295" (7.50mm)	Active
ADM232AARWZ-REEL	Analog Devices	RS232	2/2	200 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	400 mV	0.295" (7.50mm)	Active
ADM232LARZ	Analog Devices	RS232	2/2	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	650 mV	0.295" (7.50mm)	Active
ADM232LARZ-REEL	Analog Devices	RS232	2/2	120 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	650 mV	0.295" (7.50mm)	Active
ADM232LJRZ	Analog Devices	RS232	2/2	120 kbps	4.5V ~ 5.5V	0°C ~ 70°C	650 mV	0.295" (7.50mm)	Active
ADM232LJRZ-REEL	Analog Devices	RS232	2/2	120 kbps	4.5V ~ 5.5V	0°C ~ 70°C	650 mV	0.154" (3.90mm)	Active

Engineering Selection Recommendations

For direct replacement of the obsolete DS232AS-NTR+, prioritize active-status parts with matching package width (0.295", 7.50mm) and extended operating temperature range (-40°C ~ 85°C). The ADM232AARWZ and ADM232AARWZ-REEL variants meet these criteria with 200 kbps data rate capability, 400 mV receiver hysteresis, and full RoHS3 compliance.

For applications with relaxed temperature requirements (0°C ~ 70°C commercial grade), MAX232ACSE+ provides active status and RoHS3 compliance, though the narrower package width (0.154", 3.90mm) requires PCB layout verification.

All substitute parts maintain 4.5V ~ 5.5V supply voltage compatibility, 2/2 full-duplex RS232 configuration, and MSL 1 rating. Parts with reduced data rates (120 kbps) are suitable only for low-speed serial communication applications.

Frequently Asked Questions (FAQ)

Q: Can MAX232ACSE+ directly replace DS232AS-NTR+ on existing PCBs?

A: MAX232ACSE+ has a narrower package width (0.154" vs 0.295"), requiring PCB pad and footprint verification. Additionally, its operating temperature range is restricted to 0°C ~ 70°C, limiting use to commercial-grade applications. The 200 kbps data rate is lower than the original 350 kbps specification.

Q: Which substitute offers the closest electrical match to DS232AS-NTR+?

A: ADM232AARWZ and ADM232AARWZ-REEL provide matching package width (0.295", 7.50mm), extended temperature range (-40°C ~ 85°C), and 200 kbps data rate. The 400 mV receiver hysteresis differs from the original 500 mV specification but remains within acceptable RS232 interface tolerances.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating, matching the original DS232AS-NTR+ compliance profile.

Q: What is the significance of package width differences (0.154" vs 0.295")?

A: Package width affects PCB footprint dimensions and pad spacing. Narrower packages (0.154", 3.90mm) require verification against existing PCB layouts to prevent assembly or electrical issues. Wider packages (0.295", 7.50mm) maintain compatibility with legacy board designs.

Q: Can parts with 120 kbps data rate replace the 350 kbps DS232AS-NTR+?

A: Parts with 120 kbps data rate (ADM232LARZ, ADM232LARZ-REEL, ADM232LJRZ, ADM232LJRZ-REEL) are suitable only for applications with lower serial communication speed requirements. They are not suitable for systems requiring the original 350 kbps performance.

Q: What is the difference between tube and reel packaging options?

A: Tube packaging is suitable for manual assembly and small-volume applications. Reel packaging (Cut Tape & Digi-Reel) is optimized for automated pick-and-place assembly in production environments. Both packaging types contain identical die and electrical specifications.

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