RS-232 Interface IC Quad Line Driver

SN75188NSR – Quad Line Driver for RS-232 – Texas Instruments

This SN75188NSR from Texas Instruments is a high-performance RS-232 quad line driver designed for robust serial communication. Ideal for industrial and embedded systems, it ensures reliable signal transmission with ±15kV ESD protection and wide voltage tolerance. PCX supplies this active component with guaranteed authenticity and rapid shipping.

Key Features

• Interface Type: Quad RS-232 Line Driver
• Protocol: RS232 compliant
• Supply Voltage: ±7.5V to 15V operation
• Operating Temperature: 0°C to 70°C range
• Mounting: Surface-mount (14-SOIC package)
• ESD Protection: ±15kV (human-body model)

Technical Details

Part of Texas Instruments’ legacy interface portfolio, the SN75188NSR provides four independent drivers with TTL/CMOS-compatible inputs. It features a compact 14-SOIC (5.30mm width) footprint and supports data rates up to 120kbps. The device operates across industrial-grade temperatures and includes built-in thermal shutdown protection. Base product number SN75188 ensures compatibility with existing designs.

Typical Applications

• Industrial automation control systems
• Point-of-sale (POS) terminals
• Legacy computer peripherals
• Embedded system debugging interfaces
• Telecommunication infrastructure

About Texas Instruments

Texas Instruments (TI) is a global semiconductor leader with over 90 years of innovation in analog and embedded processing technologies. Renowned for reliable industrial-grade components, TI sets industry standards for quality and longevity through rigorous testing protocols.

TI’s interface IC portfolio, including the SN75188 series, demonstrates their commitment to solving complex signal integrity challenges. Their components are trusted in mission-critical applications from automotive to aerospace, backed by comprehensive technical documentation and design support.

About RS-232 Interface ICs

RS-232 drivers and receivers facilitate serial communication between devices using standardized voltage levels (-15V to +15V). Despite newer protocols, RS-232 remains vital for legacy industrial equipment, diagnostic ports, and specialized instrumentation due to its simplicity and noise immunity.

Line drivers like the SN75188NSR convert logic-level signals to RS-232 voltages, enabling long-distance communication (typically up to 15 meters). They serve as critical interfaces in environments where electromagnetic interference (EMI) resistance is paramount, ensuring data integrity in manufacturing floors and harsh operational settings.

Packaging Options

Available in Tape & Reel (TR) for automated assembly and Cut Tape (CT) for prototyping needs. All packaging complies with ESD-safe handling standards.

Frequently Asked Questions

Question: What is the maximum data rate supported?
Answer: The SN75188NSR supports data rates up to 120kbps for reliable serial communication.

Question: Is this IC compatible with 3.3V logic?
Answer: Yes, it accepts TTL/CMOS inputs down to 3.3V while generating RS-232 output voltages.

Question: Does it require external protection components?
Answer: Built-in ±15kV ESD protection minimizes external circuitry, though series resistors are recommended for cable discharge events.

Question: Can I use this in extended temperature environments?
Answer: This version supports 0°C to 70°C. For -40°C to 85°C operation, consider the SN75188NSRE4 variant.

Question: How does RS-232 differ from newer standards like USB?
Answer: RS-232 uses simpler point-to-point connections with higher voltage swings for superior noise immunity in industrial settings, unlike USB’s differential signaling.

Question: Are evaluation boards available for testing?
Answer: Texas Instruments offers reference designs; contact PCX support for application-specific guidance.

⚠️ Note: Product images are representational. Refer to datasheet for exact specifications.

Datasheet: Download full technical documentation

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