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LMS75LBC176M/NOPB Equivalent & Substitute Parts
Part Overview
The LMS75LBC176M/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 ongoing design support and procurement. The device operates within a 4.75V to 5.25V supply voltage range and supports industrial serial communication protocols. Identifying compatible alternatives ensures design continuity and supply chain flexibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LMS75LBC176M/NOPB |
| Manufacturer | Texas Instruments |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Receiver Hysteresis | 10 mV |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the LMS75LBC176M/NOPB is determined by the following critical parameters:
Protocol Compatibility: All substitute parts must support RS422 and RS485 protocols with half-duplex operation and 1/1 driver/receiver configuration.
Electrical Specifications: Supply voltage range of 4.75V to 5.25V is mandatory. Receiver hysteresis values of 10 mV, 30 mV, or 50 mV are acceptable within RS422/RS485 transceiver specifications.
Package and Mounting: All substitutes must use 8-SOIC surface mount packaging with 0.154" (3.90mm) width to ensure PCB compatibility without layout modifications.
Data Rate Tolerance: The original part specifies no data rate limit. Substitute parts with specified data rates of 4 Mbps, 30 Mbps, or 40 Mbps are functionally compatible, as these exceed typical RS422/RS485 application requirements.
Operating Temperature: The original part operates 0°C to 70°C. Substitutes with extended ranges (-40°C to 85°C or -40°C to 125°C) provide enhanced environmental capability and are acceptable.
Product Status and Compliance: Active product status is preferred for long-term availability. All substitutes maintain ROHS3 compliance and MSL 1 rating, matching the original part's environmental specifications.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Duplex | Receiver Hysteresis | Data Rate | Supply Voltage | Operating Temp | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| LMS75LBC176M/NOPB | Texas Instruments | RS422, RS485 | 1/1 | Half | 10 mV | — | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete |
| SN75LBC176AD | Texas Instruments | RS422, RS485 | 1/1 | Half | 50 mV | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete |
| SN75LBC176ADR | Texas Instruments | RS422, RS485 | 1/1 | Half | 50 mV | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete |
| SN75LBC176D | Texas Instruments | RS422, RS485 | 1/1 | Half | 50 mV | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete |
| SN75LBC176DR | Texas Instruments | RS422, RS485 | 1/1 | Half | 50 mV | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete |
| LTC1482CS8#PBF | Analog Devices Inc. | RS422, RS485 | 1/1 | Half | 30 mV | 4 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active |
| LTC1482IS8#PBF | Analog Devices Inc. | RS422, RS485 | 1/1 | Half | 30 mV | 4 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
| LTC1482IS8#TRPBF | Analog Devices Inc. | RS422, RS485 | 1/1 | Half | 30 mV | 4 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
| LTC1484CS8#TRPBF | Analog Devices Inc. | RS422, RS485 | 1/1 | Half | 30 mV | 4 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active |
| LTC1484IS8#TRPBF | Analog Devices Inc. | RS422, RS485 | 1/1 | Half | 30 mV | 4 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active |
| MAX14841EASA+ | Analog Devices Inc./Maxim Integrated | RS422, RS485 | 1/1 | Half | 50 mV | 40 Mbps | 3V ~ 3.6V | -40°C ~ 125°C | 8-SOIC | Active |
Engineering Selection Recommendations
Texas Instruments SN75LBC176 Series (SN75LBC176AD, SN75LBC176ADR, SN75LBC176D, SN75LBC176DR): These parts maintain the same manufacturer lineage as the original LMS75LBC176M/NOPB. All variants are obsolete but share identical electrical specifications with 50 mV receiver hysteresis and 30 Mbps data rate capability. These are direct functional equivalents within the Texas Instruments product portfolio. Packaging variants (Tube vs. Cut Tape & Digi-Reel) accommodate different procurement and assembly workflows.
Analog Devices LTC1482 Series (LTC1482CS8#PBF, LTC1482IS8#PBF, LTC1482IS8#TRPBF): These active parts provide RS422/RS485 half-duplex transceiver functionality with 30 mV receiver hysteresis and 4 Mbps data rate. The LTC1482IS8 variants support extended operating temperature (-40°C to 85°C), offering improved environmental capability. All maintain 4.75V to 5.25V supply voltage compatibility. Product status is active, ensuring long-term availability.
Analog Devices LTC1484 Series (LTC1484CS8#TRPBF, LTC1484IS8#TRPBF): These active parts deliver identical protocol and electrical performance to the LTC1482 series with 30 mV hysteresis and 4 Mbps data rate. The LTC1484IS8#TRPBF variant extends operating temperature to -40°C to 125°C, providing the widest environmental range among active substitutes. Tape & Reel packaging supports high-volume manufacturing.
Analog Devices MAX14841EASA+: This active part operates at a reduced supply voltage range (3V to 3.6V) and is not electrically compatible with the original 4.75V to 5.25V specification. This part is excluded from substitution consideration due to voltage incompatibility.
Recommended Primary Substitutes: For new designs and ongoing production, LTC1482IS8#TRPBF or LTC1484IS8#TRPBF are preferred due to active product status, extended temperature range, and established supply availability. For legacy system repairs requiring exact electrical matching, SN75LBC176ADR or SN75LBC176DR provide direct functional equivalence, though availability is limited due to obsolete status.
Frequently Asked Questions (FAQ)
Q: Can I use SN75LBC176 variants as direct replacements for LMS75LBC176M/NOPB?
A: Yes. The SN75LBC176 series (AD, ADR, D, DR variants) are functionally equivalent. All support RS422/RS485 half-duplex operation with 1/1 driver/receiver configuration, 4.75V to 5.25V supply voltage, and 8-SOIC packaging. The 50 mV receiver hysteresis in SN75LBC176 variants exceeds the original 10 mV specification, which is acceptable for RS422/RS485 applications. Packaging differences (Tube vs. Cut Tape & Digi-Reel) do not affect electrical performance.
Q: What is the difference between LTC1482 and LTC1484 series?
A: Both series provide identical RS422/RS485 half-duplex transceiver functionality with 30 mV receiver hysteresis and 4 Mbps data rate. The primary difference is packaging: LTC1482 is available in Tube and standard reel formats, while LTC1484 is optimized for Tape & Reel (TR) high-volume manufacturing. Electrical performance and pin compatibility are identical.
Q: Why does MAX14841EASA+ appear in the substitute list but is not recommended?
A: MAX14841EASA+ operates at 3V to 3.6V supply voltage, which is incompatible with the original part's 4.75V to 5.25V requirement. Although it provides RS422/RS485 half-duplex transceiver functionality in an 8-SOIC package, the voltage mismatch prevents direct substitution without circuit redesign.
Q: Are there temperature range considerations for substitution?
A: The original LMS75LBC176M/NOPB operates 0°C to 70°C. Substitutes with extended ranges (-40°C to 85°C or -40°C to 125°C) are acceptable and provide enhanced environmental capability. If your application requires the original 0°C to 70°C range only, parts with extended ranges remain compatible and offer design margin.
Q: Does receiver hysteresis variation affect substitution compatibility?
A: Receiver hysteresis values of 10 mV, 30 mV, or 50 mV are all within RS422/RS485 transceiver specifications. The original part specifies 10 mV; substitutes with 30 mV or 50 mV provide slightly increased noise immunity. This variation does not prevent substitution in standard RS422/RS485 applications.
Q: What packaging options are available for active substitutes?
A: Active substitutes are available in Tube (standard packaging for lower volumes), Cut Tape & Digi-Reel (CT), and Tape & Reel (TR) formats. All maintain 8-SOIC surface mount configuration. Selection depends on procurement volume and assembly line requirements; electrical performance is identical across packaging variants.
Q: Is RoHS3 compliance maintained across all substitutes?
A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.
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