Diodes Incorporated 74HC14S14-13

Overview

74HC14S14-13 from Diodes Incorporated is a hex Schmitt-trigger inverter IC in SO-14 package, operating from 2.0V to 6.0V supply, delivering 4mA output drive at 4.5V, with input hysteresis (0.4–1.4V typ), propagation delay ≤25ns at 4.5V, and ESD protection exceeding 2kV HBM - used for noise-immune signal conditioning in digital interface circuits.

For engineers reviewing the 74HC14S14-13 datasheet, 74HC14S14-13 pinout, 74HC14S14-13 application, or 74HC14S14-13 equivalent, key selection criteria include supply voltage range compatibility, Schmitt-trigger hysteresis width, output drive capability at target VCC, thermal limits (–40°C to +125°C), and SO-14 footprint constraints in space-constrained logic interfaces.

Technical Context

The 74HC14S14-13 implements six independent CMOS inverters, each with asymmetric Schmitt-trigger inputs providing noise immunity via defined VT+ (1.7–4.2V) and VT− (0.9–2.6V) thresholds. Its push-pull outputs support rail-to-rail switching with guaranteed VOL ≤0.4V at 4mA sink and VOH ≥3.84V at 4mA source under 4.5V supply.

Designed for standard 74HC logic families, it operates across industrial temperature (–40°C to +125°C) with low ICC (≤40μA at 6V) and integrates ESD protection per JESD22-A114 (2kV HBM), A115 (200V MM), and C101C (>1kV CDM), enabling robust deployment in PC peripherals and consumer electronics I/O stages.

Key Specifications

Pinout & Package

74HC14S14-13 is housed in a 14-pin SOIC (SO-14) package with 1.27mm pitch, 8.53–8.74mm body length, and 3.80–3.99mm width - compatible with standard reflow profiles and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex Schmitt-trigger inverter applications.

Compared with SN74HC14DR and MC74HC14ADTR2G, the 74HC14S14-13 offers optimal balance of SO-14 manufacturability, 40μA worst-case ICC, and proven field reliability in PC peripheral designs - making it the default choice for cost-sensitive, high-volume industrial logic interfaces.

Availability

74HC14S14-13 is available at Aetrix Electronics and suitable for PC motherboard I/O conditioning, hard disk drive control logic, and DVD-ROM spindle enable circuits requiring stable component supply across multi-year production cycles.

Supply support for 74HC14S14-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-qualified components for computing, consumer, and industrial markets.

The 74HC14S14-13 belongs to Diodes' 74HC logic family, engineered for interoperability with legacy TTL and modern CMOS systems while meeting stringent ESD and thermal requirements in high-volume peripheral applications.

FAQ

What is the maximum recommended operating frequency for 74HC14S14-13?

The 74HC14S14-13 has no specified maximum clock frequency, but its typical propagation delay of 15ns at 4.5V and 50pF load implies reliable operation up to ~20MHz for single-gate toggle. For sustained square-wave generation, ensure input rise/fall times meet datasheet minimums (e.g., ≤140ns/V at 4.5V) to avoid partial switching or increased power dissipation.

Can unused inputs be left floating?

No - unused Schmitt-trigger inputs must be tied to either VCC or GND. Floating inputs cause unpredictable oscillation due to internal hysteresis and high input impedance, leading to excessive ICC, localized heating, and potential logic errors in adjacent gates. The datasheet explicitly requires termination per Note 6.

Is 74HC14S14-13 RoHS compliant and lead-free?

Yes - the 74HC14S14-13 is fully RoHS 2 compliant (2011/65/EU), contains no purposely added lead, and is halogen- and antimony-free per Diodes' "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb). This is confirmed in the ordering information and marking notes of DS35323 Rev. 2-2.

How does the Schmitt trigger hysteresis improve noise immunity?

The 74HC14S14-13 provides 0.4–1.4V hysteresis (ΔVT), meaning the input must swing at least that voltage beyond the threshold to change state. This prevents multiple toggles when noise causes the input to hover near VT+, effectively rejecting transients ≤±700mV - critical for debouncing switches or cleaning up long-trace signals in noisy environments.