SN75176BD-P Equivalent & Substitute Parts

Part Overview

The SN75176BD-P is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This device functions as a single driver/receiver pair for industrial communication protocols requiring differential signaling over twisted-pair cabling.

The SN75176BD-P is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this component.

Substiute Parts

SN75176BD-P

Texas InstrumentsIn Stock: 1019SN75176BD-P Datasheet

Current PartRFQ

SN75176BDR

UMWIn Stock: 195585SN75176BDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN75176BD-P is determined by strict alignment of the following critical parameters:

Protocol Compatibility: The substitute must support RS422 and RS485 protocols identically. These are differential signaling standards with specific electrical characteristics; protocol deviation disqualifies a part from substitution.

Configuration Match: The 1/1 driver/receiver half-duplex topology is fundamental to the part's function. Substitutes must maintain this exact configuration. Full-duplex or multi-driver/receiver variants are not interchangeable.

Electrical Parameters: Supply voltage range (4.75V ~ 5.25V) and operating temperature range (0°C ~ 70°C) must be met or exceeded. Receiver hysteresis and data rate specifications establish the signal integrity envelope.

Package Compatibility: The 8-SOIC surface mount package defines the physical footprint and pin assignment. Package variants (such as 8-SOP) may be electrically compatible but require PCB layout verification due to potential dimensional differences.

Regulatory Compliance: ROHS3 compliance is mandatory for current production and supply chain acceptance.

The SN75176BDR (UMW manufacturer) qualifies as a substitute based on protocol support, configuration, voltage range, temperature range, and RoHS compliance. Minor parameter variations (receiver hysteresis 70 mV vs. 50 mV) fall within acceptable tolerance for RS422/RS485 applications.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Production Continuity:

The SN75176BDR (UMW) is the qualified substitute for the obsolete SN75176BD-P. Selection is based on the following engineering criteria:

1. Protocol and Functional Equivalence: Both parts implement identical RS422/RS485 half-duplex transceiver functionality with 1/1 driver/receiver configuration.

2. Electrical Compatibility: Supply voltage range and operating temperature specifications are identical, ensuring drop-in compatibility in existing circuit designs.

3. Package Compatibility: Both parts use the 8-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm width), permitting direct PCB footprint reuse without layout modification.

4. Regulatory Compliance: The SN75176BDR maintains ROHS3 compliance, meeting current environmental and supply chain requirements.

5. Product Status and Availability: The SN75176BDR is in active production with substantial inventory (195,480 units), providing long-term supply security compared to the obsolete SN75176BD-P (984 units remaining).

6. Parameter Variation: The receiver hysteresis difference (70 mV vs. 50 mV) represents an improvement in noise immunity and does not degrade system performance in standard RS422/RS485 applications operating within the specified voltage and temperature ranges.

Implementation Consideration:

Direct substitution of SN75176BDR for SN75176BD-P requires no circuit modification, PCB redesign, or firmware changes. The parts are functionally and physically interchangeable within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the SN75176BDR directly replace the SN75176BD-P without PCB modification?

A: Yes. Both parts use the 8-SOIC surface mount package with identical pin assignments, physical dimensions, and electrical specifications (supply voltage, temperature range, protocol support). Direct substitution on existing PCBs is supported.

Q: What is the significance of the receiver hysteresis difference (50 mV vs. 70 mV)?

A: Receiver hysteresis defines the voltage differential required between the positive and negative differential inputs to trigger a logic state change. The SN75176BDR's higher hysteresis (70 mV) provides improved noise immunity in electrically noisy environments. This is a functional improvement and does not create incompatibility with the original 50 mV specification.

Q: Are there any protocol differences between the SN75176BD-P and SN75176BDR?

A: No. Both parts implement identical RS422 and RS485 protocol support with 1/1 half-duplex transceiver configuration. Protocol compatibility is complete.

Q: Why is the SN75176BD-P classified as obsolete?

A: The SN75176BD-P is a legacy Texas Instruments product that has been discontinued from active production. The SN75176BDR represents the current-generation equivalent from an alternative manufacturer (UMW), maintaining functional and electrical compatibility while ensuring ongoing supply availability.

Q: Does the SN75176BDR meet the same environmental compliance standards?

A: Yes. The SN75176BDR is ROHS3 compliant, meeting current environmental regulations. It also carries REACH Unaffected status and EAR99 export classification, supporting global supply chain requirements.

Q: What is the data rate specification for the SN75176BDR?

A: The data rate specification for the SN75176BDR is not provided in the available technical documentation. The original SN75176BD-P specifies 10 Mbps maximum data rate. For applications requiring confirmed data rate specifications, refer to the UMW SN75176BDR datasheet.

Q: Are there packaging format differences between the two parts?

A: The SN75176BD-P is supplied in standard packaging. The SN75176BDR is available in Cut Tape (CT) and Digi-Reel® formats, providing flexibility for different procurement and assembly workflows. The physical component and package dimensions remain identical.