Diodes Incorporated 74HC05S14-13

Overview

74HC05S14-13 from Diodes Incorporated is a hex inverter IC with six independent open-drain outputs, designed for level-shifting and wired-AND logic in 2.0V–6.0V systems. It sinks up to 4mA at V_CC = 4.5V, features Schmitt-trigger inputs for noise immunity, and operates across –40°C to +125°C. Used in PC peripheral interfaces and optical drive control circuits where active-low open-drain signaling is required.

For engineers reviewing the 74HC05S14-13 datasheet, 74HC05S14-13 pinout, 74HC05S14-13 application, or 74HC05S14-13 equivalent, key selection criteria include open-drain output drive capability, input hysteresis voltage (≈0.4V at V_CC = 4.5V), propagation delay (9 ns typ. at 4.5V), supply voltage flexibility, and SO-14 package thermal performance.

Technical Context

The 74HC05 implements six identical CMOS inverters, each with an unbuffered open-drain output stage that requires external pull-up for logic high assertion. Input stages incorporate Schmitt-trigger action with hysteresis of ≈0.4V at 4.5V supply, enabling robust noise rejection on slow or noisy signal lines.

All six channels operate independently with identical electrical behavior: propagation delay t_PD = 9 ns (typ.) at V_CC = 4.5V and C_L = 50 pF; output low voltage V_OL ≤ 0.33 V at I_OL = 4 mA; and input leakage current ≤ ±1 μA over full temperature range.

Key Specifications

Pinout & Package

74HC05S14-13 is housed in a 14-pin SOIC (SO-14) package with 1.27 mm pitch, 8.53–8.74 mm body length, and 3.80–3.99 mm width. Thermal resistance θ_JA ≈ 120°C/W enables continuous operation at ambient up to +85°C with no heatsink.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter with open-drain output applications.

Compared with SN74HC05DR and 74HCT05PW,118, the 74HC05S14-13 uniquely combines Schmitt-trigger inputs with open-drain outputs in a single SO-14 package - critical for noise-prone industrial sensor conditioning and mixed-voltage bus arbitration where input hysteresis cannot be added externally.

Availability

74HC05S14-13 is available at Aetrix Electronics and suitable for hard disk drive interface design, optical drive motor control, and PC peripheral bus arbitration requiring stable component supply and long-term industrial availability.

Supply support for 74HC05S14-13 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 components for industrial, computing, and consumer applications.

The 74HC05 belongs to Diodes' HC logic family, engineered for low-power, noise-immune digital interfacing in mixed-voltage embedded systems - particularly where Schmitt-trigger inputs and open-drain outputs simplify sensor, bus, and peripheral interface design.

FAQ

Can 74HC05S14-13 drive an LED directly?

Yes - each open-drain output can sink up to 4 mA at V_CC = 4.5 V, sufficient for low-current indicator LEDs. A series current-limiting resistor must be used with an external pull-up (e.g., 1 kΩ to 5 V) to set forward current. Do not exceed 25 mA total device output current or 50 mW total power dissipation.

What is the minimum recommended pull-up resistor value for 74HC05S14-13?

The minimum pull-up value depends on load capacitance and required rise time. For C_L = 50 pF and t_r ≤ 20 ns, R_PULLUP ≤ 400 Ω is recommended. At 4.5 V supply, this yields ~11 mA peak current during transition - ensure total device current stays below 25 mA per output and 50 mA total.

Does 74HC05S14-13 require unused inputs to be terminated?

Yes - per datasheet Note 6, all unused inputs must be tied to V_CC or GND to prevent floating states that increase ICC and cause erratic output behavior. Leaving inputs unconnected may result in oscillation, excessive power draw, or latch-up under temperature extremes.

Is 74HC05S14-13 compatible with 3.3V-only systems?

Yes - it operates down to 2.0 V supply and accepts 3.3 V logic levels as valid inputs (V_IH = 3.15 V min at V_CC = 4.5 V). When powered at 3.3 V, V_IH = 2.31 V min, making it fully compatible with standard 3.3 V CMOS outputs while retaining Schmitt noise immunity.