UART (Universal Asynchronous Receiver/Transmitter): Component Specs, Materials & Applications

Component Specifications

Definition

The Universal Asynchronous Receiver/Transmitter (UART) is an integrated circuit or module that facilitates asynchronous serial communication by converting parallel data from a CPU into a serial bit stream for transmission, and vice versa for reception. It operates without a shared clock signal, using start and stop bits to frame data packets, making it fundamental for point-to-point communication in industrial automation, embedded systems, and legacy equipment interfaces.

Working Principle

UART works by transmitting data as a series of bits over a single wire, with each character framed by a start bit (logic low), data bits (typically 5-9 bits), optional parity bit for error checking, and stop bits (logic high). The receiver samples the data line at a predefined baud rate to synchronize and decode the incoming stream, relying on timing rather than a clock signal. It handles flow control via hardware signals like RTS/CTS or software methods to prevent data loss.

Materials

Typically constructed from silicon-based semiconductor materials (e.g., CMOS or TTL logic), housed in plastic or ceramic IC packages (e.g., DIP, SOIC). Connectors may use copper alloys with gold or tin plating for corrosion resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Parity	None, Even, Odd
Baud Rate	110 to 115200 bps (common industrial range)
Data Bits	5 to 9 bits
Stop Bits	1, 1.5, or 2 bits
Voltage Levels	TTL (0-5V), RS-232 (±3 to ±15V), RS-422/485 (differential)
Operating Temperature	-40°C to 85°C (industrial grade)

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/IEC 7816, DIN 66020, EIA/TIA-232-F, EIA/TIA-422, EIA/TIA-485

Parent Products

This component is used in the following industrial products

Serial Communication Interface

A hardware and software interface that enables serial data transmission between devices using protocols like RS-232, RS-485, or UART.

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Serial Interface

A communication interface that transmits data sequentially, one bit at a time, over a single channel.

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Engineering Analysis

Risks & Mitigation

Electromagnetic interference (EMI) disrupting signal integrity
Baud rate mismatches causing data corruption
Ground loops leading to voltage spikes
Limited error correction in basic implementations

FMEA Triads

Trigger: Noise or voltage fluctuations on communication lines
Failure: Data corruption or loss during transmission
Mitigation: Use shielded cables, add ferrite beads, and implement error-checking protocols

Trigger: Incorrect baud rate configuration
Failure: Communication failure between devices
Mitigation: Validate settings during installation and use auto-baud detection if supported

Trigger: Connector corrosion or physical damage
Failure: Intermittent or broken connections
Mitigation: Apply protective coatings, use industrial-grade connectors, and schedule regular maintenance

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Signal timing tolerance typically ±2% of baud rate for reliable synchronization

Test Method

Verified using oscilloscopes for signal integrity, protocol analyzers for data accuracy, and environmental testing per IEC 61000-4 for EMI resistance.

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of UART (Universal Asynchronous Receiver/Transmitter)

Manufacturer profiles associated with UART (Universal Asynchronous Receiver/Transmitter).

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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 UART and USART?

UART supports only asynchronous communication, while USART (Universal Synchronous/Asynchronous Receiver/Transmitter) can handle both asynchronous and synchronous modes, making it more versatile for clocked protocols.

How does UART handle errors in industrial environments?

UART uses parity bits for basic error detection and may incorporate hardware flow control (e.g., RTS/CTS) to manage data flow, but it lacks advanced error correction; higher-level protocols are often added for reliability in noisy settings.

Can UART be used for long-distance communication?

Yes, with transceivers like RS-422 or RS-485, UART can support distances up to 1200 meters, making it suitable for industrial networks, though it's inherently designed for short-range links.

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.

UART (Universal Asynchronous Receiver/Transmitter)