DS1487M/NOPB Equivalent & Substitute Parts

Part Overview

The DS1487M/NOPB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The DS1487M/NOPB operates within a 4.75V to 5.25V supply range with a 2Mbps data rate capability and 70mV receiver hysteresis, designed for industrial communication applications requiring half-duplex serial transmission.

Key Parameters

Parameter	DS1487M/NOPB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Drivers/Receivers	1/1
Duplex	Half
Package	8-SOIC (0.154", 3.90mm Width)
Data Rate	2Mbps
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	70mV
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DS1487M/NOPB is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Protocol: RS422/RS485 half-duplex operation
Package: 8-SOIC form factor (0.154", 3.90mm Width)
Driver/Receiver Configuration: 1/1 (single driver, single receiver)
Duplex Mode: Half-duplex
Mounting Type: Surface Mount

Performance Parameters Affecting Substitution:

Data Rate: Substitute must support minimum 2Mbps or higher
Supply Voltage Range: Must encompass or exceed 4.75V ~ 5.25V
Operating Temperature: Substitute must cover 0°C ~ 70°C minimum
Receiver Hysteresis: 70mV reference (variations acceptable within RS422/RS485 specification)

Substitute parts are grouped into two categories: direct replacements from Texas Instruments (SN65HVD485ED, SN65LBC182DR, SN75LBC182DR) and cross-manufacturer alternatives (Analog Devices ADM1487 series, Renesas ISL32472/ISL32475/ISL31492 series) that meet all mandatory criteria and equal or exceed performance specifications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status
DS1487M/NOPB	Texas Instruments	RS422, RS485	2Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70mV	8-SOIC	Obsolete
SN65HVD485ED	Texas Instruments	RS422, RS485	10Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	30mV	8-SOIC	Last Time Buy
SN65LBC182DR	Texas Instruments	RS422, RS485	250kbps	4.75V ~ 5.25V	-40°C ~ 85°C	70mV	8-SOIC	Active
SN75LBC182DR	Texas Instruments	RS422, RS485	250kbps	4.75V ~ 5.25V	0°C ~ 70°C	70mV	8-SOIC	Active
ADM1487EARZ	Analog Devices Inc.	RS422, RS485	2.5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70mV	8-SOIC	Active
ADM1487EARZ-REEL7	Analog Devices Inc.	RS422, RS485	2.5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70mV	8-SOIC	Active
ISL31492EIBZ-T7A	Renesas Electronics	RS422, RS485	250kbps	4.5V ~ 5.5V	-40°C ~ 85°C	25mV	8-SOIC	Active
ISL32472EIBZ	Renesas Electronics	RS422, RS485	250kbps	4.5V ~ 5.5V	-40°C ~ 85°C	25mV	8-SOIC	Active
ISL32472EIBZ-T	Renesas Electronics	RS422, RS485	250kbps	4.5V ~ 5.5V	-40°C ~ 85°C	25mV	8-SOIC	Active
ISL32472EIBZ-T7A	Renesas Electronics	RS422, RS485	250kbps	4.5V ~ 5.5V	-40°C ~ 85°C	25mV	8-SOIC	Active
ISL32475EIBZ	Renesas Electronics	RS422, RS485	1Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	25mV	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: ADM1487EARZ / ADM1487EARZ-REEL7

The ADM1487 series from Analog Devices provides the closest functional match to the DS1487M/NOPB. Both maintain identical supply voltage range (4.75V ~ 5.25V) and receiver hysteresis (70mV). The ADM1487 exceeds the original 2Mbps data rate with 2.5Mbps capability and extends operating temperature to -40°C ~ 85°C. Both variants are ROHS3 compliant and REACH unaffected. The REEL7 variant (ADM1487EARZ-REEL7) is packaged in Cut Tape & Digi-Reel format for production environments.

Secondary Recommendation: SN65HVD485ED

The SN65HVD485ED from Texas Instruments offers superior performance with 10Mbps data rate and extended temperature range (-40°C ~ 85°C). Supply voltage range expands to 4.5V ~ 5.5V, providing broader compatibility. This part carries Last Time Buy status, indicating limited availability. ROHS3 compliant and REACH unaffected.

Alternative for Extended Temperature Applications: SN65LBC182DR

The SN65LBC182DR maintains exact supply voltage and hysteresis specifications while offering active product status and extended temperature range (-40°C ~ 85°C). Data rate is reduced to 250kbps, suitable for lower-speed applications. ROHS3 compliant with active availability.

Renesas ISL32472 Series for Broader Supply Voltage Tolerance:

The ISL32472 variants (EIBZ, EIBZ-T, EIBZ-T7A) provide 4.5V ~ 5.5V supply range and -40°C ~ 85°C operating temperature with active product status. Data rate is 250kbps with 25mV receiver hysteresis. Multiple packaging options available (Tube, Tape & Reel). ROHS3 compliant.

High-Speed Alternative: ISL32475EIBZ

For applications requiring 1Mbps data rate with extended temperature range, the ISL32475EIBZ offers 4.5V ~ 5.5V supply voltage and -40°C ~ 85°C operation. Active product status with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace DS1487M/NOPB with SN65HVD485ED?

A: Yes. Both are half-duplex RS422/RS485 transceivers in 8-SOIC packaging with 1/1 driver/receiver configuration. The SN65HVD485ED exceeds the original specifications with 10Mbps data rate versus 2Mbps, and extends operating temperature to -40°C ~ 85°C. Pin-compatible operation is supported.

Q: What is the difference between ADM1487EARZ and ADM1487EARZ-REEL7?

A: Both parts are electrically identical with 2.5Mbps data rate, 4.75V ~ 5.25V supply, and 70mV hysteresis. The primary difference is packaging: ADM1487EARZ is supplied in Tube format, while ADM1487EARZ-REEL7 is supplied in Cut Tape & Digi-Reel format for automated assembly lines.

Q: Why do some substitutes have lower data rates (250kbps) than the original (2Mbps)?

A: The SN65LBC182DR, SN75LBC182DR, ISL32472 series, and ISL31492 are designed for lower-speed RS422/RS485 applications. They remain valid substitutes if your application operates at or below 250kbps. Verify your system's actual data rate requirement before selection.

Q: Is the ISL32472 series compatible with the DS1487M/NOPB?

A: Yes, for applications operating at 250kbps or lower. The ISL32472 series maintains half-duplex RS422/RS485 operation in 8-SOIC packaging. The supply voltage range is broader (4.5V ~ 5.5V), and operating temperature extends to -40°C ~ 85°C. Receiver hysteresis is 25mV versus the original 70mV, which remains within RS422/RS485 specification tolerances.

Q: What is the significance of product status (Obsolete, Last Time Buy, Active)?

A: Obsolete parts (DS1487M/NOPB) are no longer manufactured and have limited inventory. Last Time Buy parts (SN65HVD485ED) have restricted availability with defined end-of-life dates. Active parts have ongoing production and guaranteed long-term availability. For new designs, select Active status parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the original DS1487M/NOPB.

Q: Can I use ISL32475EIBZ if my application requires 2Mbps?

A: No. The ISL32475EIBZ is rated for 1Mbps maximum data rate. For 2Mbps operation, select ADM1487EARZ (2.5Mbps), SN65HVD485ED (10Mbps), or verify that your application can operate at reduced speed with ISL32472 series (250kbps).

Q: What packaging options are available for production?

A: Tube packaging is available for ADM1487EARZ, ISL32472EIBZ, and ISL32475EIBZ. Cut Tape & Digi-Reel format is available for SN65LBC182DR, SN75LBC182DR, ADM1487EARZ-REEL7, and ISL32472EIBZ-T7A. Select based on your assembly process requirements.

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