LMS1487ECM/NOPB Equivalent & Substitute Parts

Part Overview

The LMS1487ECM/NOPB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device operates within a 4.75V to 5.25V supply range with a 2.5Mbps data rate capability and supports 1/1 driver/receiver configuration for half-duplex serial communication applications.

Key Parameters

Parameter	LMS1487ECM/NOPB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Duplex Mode	Half
Drivers/Receivers	1/1
Package	8-SOIC (0.154", 3.90mm Width)
Voltage Supply	4.75V ~ 5.25V
Data Rate	2.5Mbps
Receiver Hysteresis	95 mV
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LMS1487ECM/NOPB is determined by the following critical parameters:

Core Compatibility Requirements:

Protocol: RS422/RS485 half-duplex operation
Configuration: 1/1 driver/receiver
Package: 8-SOIC surface mount form factor
Voltage Supply Range: 4.75V ~ 5.25V nominal operation
Duplex Mode: Half-duplex only

Substitution Categories:

Category A - Direct Pin-Compatible Substitutes (8-SOIC, Half-Duplex, 4.75V-5.25V Supply): These parts maintain identical pinout, package, and core electrical specifications within the original supply voltage range.

SN65176BDR (UMW)
ADM1487EARZ (Analog Devices Inc.)
ADM1487EARZ-REEL7 (Analog Devices Inc.)
ADM483ARZ (Analog Devices Inc.)
ISL81487EIBZ (Renesas Electronics Corporation)
ISL81487EIBZ-T (Renesas Electronics Corporation)
ISL81487IBZ (Renesas Electronics Corporation)

Category B - Enhanced Performance Substitutes (8-SOIC, Half-Duplex, Different Supply Voltage): These parts offer improved specifications but operate outside the original 4.75V-5.25V supply window and require circuit design verification.

ISL3179EFBZ (Renesas Electronics Corporation) - 3V ~ 3.6V supply
ISL3179EFBZ-T (Renesas Electronics Corporation) - 3V ~ 3.6V supply

Category C - Functional Equivalent with Different Package (14-SOIC, Full-Duplex): This part provides full-duplex capability but requires different PCB layout and is not pin-compatible.

ISL3180EIBZ (Renesas Electronics Corporation) - 14-SOIC package, full-duplex

Parameter Comparison

Part Number	Manufacturer	Package	Duplex	Voltage Supply	Data Rate	Receiver Hysteresis	Operating Temp	Product Status	MSL Rating
LMS1487ECM/NOPB	Texas Instruments	8-SOIC	Half	4.75V ~ 5.25V	2.5Mbps	95 mV	0°C ~ 70°C	Obsolete	1
SN65176BDR	UMW	8-SOIC	Half	4.75V ~ 5.25V	—	70 mV	-40°C ~ 105°C	Active	1
ADM1487EARZ	Analog Devices Inc.	8-SOIC	Half	4.75V ~ 5.25V	2.5Mbps	70 mV	-40°C ~ 85°C	Active	1
ADM1487EARZ-REEL7	Analog Devices Inc.	8-SOIC	Half	4.75V ~ 5.25V	2.5Mbps	70 mV	-40°C ~ 85°C	Active	1
ADM483ARZ	Analog Devices Inc.	8-SOIC	Half	4.75V ~ 5.25V	250kbps	70 mV	-40°C ~ 85°C	Active	1
ISL3179EFBZ	Renesas Electronics Corporation	8-SOIC	Half	3V ~ 3.6V	40Mbps	28 mV	-40°C ~ 125°C	Active	3
ISL3179EFBZ-T	Renesas Electronics Corporation	8-SOIC	Half	3V ~ 3.6V	40Mbps	28 mV	-40°C ~ 125°C	Active	3
ISL3180EIBZ	Renesas Electronics Corporation	14-SOIC	Full	3V ~ 3.6V	40Mbps	28 mV	-40°C ~ 85°C	Active	3
ISL81487EIBZ	Renesas Electronics Corporation	8-SOIC	Half	4.5V ~ 5.5V	5Mbps	70 mV	-40°C ~ 85°C	Active	3
ISL81487EIBZ-T	Renesas Electronics Corporation	8-SOIC	Half	4.5V ~ 5.5V	5Mbps	70 mV	-40°C ~ 85°C	Active	3
ISL81487IBZ	Renesas Electronics Corporation	8-SOIC	Half	4.5V ~ 5.5V	5Mbps	70 mV	-40°C ~ 85°C	Active	3

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Path):

ADM1487EARZ and ADM1487EARZ-REEL7 are the preferred substitutes. Both are active products from Analog Devices Inc., maintain identical 8-SOIC packaging, support the same 4.75V-5.25V supply voltage, and match the 2.5Mbps data rate specification. These parts are ROHS3 compliant with MSL-1 rating, matching the original part's compliance profile. The extended operating temperature range (-40°C to 85°C) provides improved reliability over the original 0°C to 70°C specification.

For Extended Temperature Applications:

SN65176BDR (UMW) and ISL81487EIBZ series offer extended operating temperature ranges (-40°C to 105°C and -40°C to 85°C respectively) while maintaining 8-SOIC packaging and half-duplex RS422/RS485 operation. SN65176BDR operates within the original 4.75V-5.25V supply window. ISL81487 variants accept a slightly wider supply range (4.5V-5.5V) and support higher data rates (5Mbps).

For Low-Voltage Applications:

ISL3179EFBZ and ISL3179EFBZ-T are suitable only if circuit redesign accommodates 3V-3.6V supply operation. These parts offer superior performance specifications (40Mbps data rate, 28mV hysteresis, -40°C to 125°C temperature range) but require different power supply architecture and are not pin-compatible with 5V-based designs.

Not Recommended for Direct Substitution:

ISL3180EIBZ differs fundamentally in package (14-SOIC), duplex mode (full vs. half), and supply voltage (3V-3.6V). This part requires complete PCB redesign and is suitable only for new full-duplex applications.

ADM483ARZ operates at reduced data rate (250kbps) and is appropriate only for low-speed legacy applications.

Frequently Asked Questions (FAQ)

Q: Can I use ISL3179EFBZ as a direct replacement for LMS1487ECM/NOPB?

A: No. While both are 8-SOIC half-duplex RS422/RS485 transceivers, the ISL3179EFBZ operates on 3V-3.6V supply versus the original 4.75V-5.25V requirement. Direct substitution would cause circuit malfunction. Use only if your design is modified to support 3V-3.6V operation.

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

A: Both parts are electrically identical. The difference is packaging format: ADM1487EARZ ships in tube packaging, while ADM1487EARZ-REEL7 is supplied on cut tape and digi-reel for automated assembly. Select based on your procurement and assembly process requirements.

Q: Why does SN65176BDR show no data rate specification?

A: The data rate parameter was not provided in the manufacturer documentation for this part. Consult the SN65176BDR datasheet directly for complete electrical specifications. The part maintains RS422/RS485 protocol compatibility and 8-SOIC packaging with the original LMS1487ECM/NOPB.

Q: Can I use ISL81487EIBZ if my circuit operates at 5.5V?

A: Yes. ISL81487EIBZ accepts 4.5V-5.5V supply voltage, which encompasses your 5.5V requirement. The original LMS1487ECM/NOPB is limited to 4.75V-5.25V, so ISL81487EIBZ provides wider supply tolerance. Verify your circuit design operates within this extended range.

Q: Is ISL3180EIBZ compatible with my half-duplex RS485 application?

A: No. ISL3180EIBZ is a full-duplex transceiver in a 14-SOIC package. It is not pin-compatible with the 8-SOIC half-duplex LMS1487ECM/NOPB and requires complete circuit redesign. Use only if your application requires full-duplex operation and you can accommodate the larger package footprint.

Q: What does MSL-3 rating mean compared to the original MSL-1?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to ambient conditions before soldering. MSL-1 allows unlimited storage, while MSL-3 requires soldering within 168 hours of package opening. ISL3179 and ISL81487 variants with MSL-3 require stricter moisture control during assembly but are otherwise functionally equivalent.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original LMS1487ECM/NOPB environmental certification. All parts are also REACH unaffected and classified as EAR99 for export purposes.

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