RS485 Transceiver IC: Supply Voltage 3.3V or 5V

Component Specifications

Definition

An RS485 Transceiver IC is an integrated circuit that converts logic-level signals from a microcontroller or processor into differential voltage signals for transmission over RS485 communication lines, and vice versa for reception. It provides electrical isolation, noise rejection through balanced differential signaling, and supports half-duplex or full-duplex communication with multiple nodes on a single bus, making it essential for industrial automation, building control, and instrumentation networks.

Working Principle

The IC operates by transmitting data as a differential voltage pair (A and B lines) where the signal is represented by the voltage difference between the two lines. This differential method cancels out common-mode noise. In transmit mode, it converts single-ended logic signals to differential outputs; in receive mode, it converts differential inputs to logic-level outputs, often with fail-safe biasing to ensure a known state when the bus is idle.

Materials

Silicon semiconductor die with CMOS or BiCMOS technology, packaged in SOIC, TSSOP, or QFN with lead-free plating (e.g., SnAgCu), operating temperature range typically -40°C to +85°C or -40°C to +125°C for industrial grades.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Data Rate	Up to 20 Mbps
ESD Protection	±15kV HBM
Supply Voltage	3.3V or 5V
Operating Temperature	-40°C to +85°C
Common Mode Voltage Range	-7V to +12V
Number Of Drivers/Receivers	1/1 or 2/2

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 8482, TIA/EIA-485-A, DIN 66259

Parent Products

This component is used in the following industrial products

RS485 Communication Module

A hardware module that implements the RS485 serial communication standard for industrial data transmission.

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Engineering Analysis

Risks & Mitigation

Signal integrity loss due to improper termination or cable length
ESD damage from handling or environmental exposure
Bus contention in multi-drop setups without proper protocol management

FMEA Triads

Trigger: Incorrect termination resistor values
Failure: Signal reflections and data corruption
Mitigation: Use 120Ω resistors at both ends of the bus and match cable impedance.

Trigger: Excessive common-mode voltage beyond IC rating
Failure: IC damage or communication failure
Mitigation: Implement isolation or use ICs with wider common-mode range.

Trigger: Ground loops in distributed systems
Failure: Noise injection and signal errors
Mitigation: Use isolated transceivers or ensure single-point grounding.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% for termination resistors, ±5% for supply voltage

Test Method

Eye diagram analysis for signal integrity, ESD testing per IEC 61000-4-2, and bus loading tests per TIA/EIA-485-A.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of RS485 Transceiver IC

Manufacturer profiles associated with RS485 Transceiver IC.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between RS485 and RS232 transceivers?

RS485 uses differential signaling for noise immunity and supports multi-drop networks over longer distances (up to 1200 meters), while RS232 uses single-ended signaling for point-to-point communication with shorter range and less noise resistance.

Can RS485 Transceiver ICs be used in half-duplex and full-duplex modes?

Yes, some ICs support both modes: half-duplex uses a single pair for bidirectional communication, while full-duplex uses separate pairs for transmitting and receiving, requiring two pairs of lines.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

RS485 Transceiver IC