Hex Schmitt Trigger

Overview

The MC14584BFELG is a hex Schmitt trigger IC manufactured using CMOS technology. It contains six independent Schmitt trigger circuits in a single 16-pin package, making it a space-efficient solution for digital signal conditioning. Originally developed by Motorola (now part of ON Semiconductor), this device has become an industry standard for applications requiring noise filtering and signal shaping. The Schmitt trigger architecture provides hysteresis in the input switching characteristics, which significantly improves noise immunity compared to standard logic gates. This makes the MC14584BFELG particularly valuable in industrial environments where electrical noise is common.

Structure and Working Principle

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Each of the six Schmitt triggers in the MC14584BFELG operates independently with separate input and output pins. The IC features standard CMOS construction with protection diodes on all inputs. The hysteresis voltage (the difference between positive-going and negative-going input thresholds) is typically 1V at 5V supply voltage. When the input voltage crosses the upper threshold, the output switches high. The output remains high until the input falls below the lower threshold, creating the characteristic hysteresis loop. This behavior persists across the entire operating voltage range (3V to 18V), making the device versatile for various logic families.

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Key Features

The MC14584BFELG offers several notable characteristics: wide operating voltage range (3V to 18V DC), high noise immunity due to input hysteresis, and balanced propagation delays (typically 250ns at 5V). The CMOS technology provides low power consumption, with typical quiescent current below 1μA per gate. Additional features include standardized pinout for easy replacement, latch-up protection exceeding 100mA, and operating temperature range of -55°C to +125°C. The device is available in SOIC-16 package (BFELG suffix), suitable for surface-mount applications requiring compact form factor.

Application Areas

This IC finds extensive use in digital systems requiring signal conditioning. Common applications include debouncing mechanical switch inputs, converting sinusoidal or irregular waveforms to clean digital signals, and interfacing between different logic families with varying voltage levels. Industrial applications include process control systems, automotive electronics, and instrumentation. Consumer applications span from home appliances to audio equipment. The device is particularly valuable in environments with significant electromagnetic interference, where its noise immunity prevents false triggering.

Maintenance and Precautions

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While the MC14584BFELG is robust, proper handling extends its lifespan. Always observe ESD precautions during installation - use grounded workstations and wrist straps. The device should be stored in anti-static packaging when not in use. For circuit design, ensure power supply decoupling with 0.1μF capacitors near the IC. Avoid exceeding absolute maximum ratings (typically 18V supply voltage). Input signals should remain within the supply rails to prevent latch-up. In high-reliability applications, consider derating parameters by 20% from published limits.

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B2B Procurement Guide

When sourcing MC14584BFELG, verify the manufacturer's markings and packaging authenticity. ON Semiconductor remains the primary manufacturer, but second-source options may be available. Minimum order quantities typically start at 100 pieces for standard purchases. Key procurement considerations include lead time (commonly 6-8 weeks for non-stock items), packaging options (tape and reel for automated assembly), and temperature grade requirements (industrial vs. commercial). For high-volume buyers (10,000+ units), negotiate pricing based on projected annual usage. Always request recent date codes to avoid obsolete stock.