Texas Instruments CD74HC14ME4

Overview

CD74HC14ME4 from Texas Instruments is a hex inverter IC with Schmitt-trigger inputs, designed for noise-immune signal conditioning and digital inversion in industrial control, sensor interface, and clock synchronization circuits. It operates across 2 V to 6 V supply, supports –55°C to +125°C ambient, delivers 6 independent gates, and features hysteresis of 0.6 V (min) at 6 V.

For engineers reviewing the CD74HC14ME4 datasheet, CD74HC14ME4 pinout, CD74HC14ME4 application, or CD74HC14ME4 equivalent, this page provides verified functional roles, real-world use cases, thermal and switching performance data, and validated alternative options for robust design-in decisions.

Technical Context

The CD74HC14ME4 implements six identical CMOS inverters, each with Schmitt-trigger input architecture providing defined positive (VT+ = 2.1 V min at VCC = 6 V) and negative (VT– = 1.2 V max) switching thresholds and 0.6 V minimum hysteresis. This enables reliable operation with slow-rising, noisy, or low-slew-rate signals without false triggering.

Each gate drives up to 10 LSTTL loads, exhibits balanced push-pull output structure, and maintains propagation delay of 23 ns (typ) at 6 V with 50 pF load. Input leakage remains ≤ ±1 µA at 6 V, and power dissipation capacitance is 20 pF per gate - critical for low-power timing and debouncing applications.

Key Specifications

Pinout & Package

CD74HC14ME4 is packaged in a 14-pin SOIC (D package), body size 8.70 mm × 3.90 mm, with standard JEDEC-compliant lead pitch and thermal profile (RθJA = 133.6 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC14ME4, SN74HC14DR offers identical performance with enhanced manufacturability, while MC74HC14ADTR2G provides second-source flexibility at a minor trade-off in worst-case propagation consistency - both preserve pin compatibility and system-level functionality.

Availability

CD74HC14ME4 is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HC14ME4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability logic families.

The CD74HC14ME4 belongs to TI's HC (High-Speed CMOS) logic family, engineered for low-power, wide-voltage, and noise-tolerant digital interfacing in mission-critical industrial and automotive applications.

FAQ

What is the maximum capacitive load the CD74HC14ME4 can drive while maintaining specified propagation delay?

The CD74HC14ME4 is characterized with a 50 pF load in its switching specifications, delivering 23 ns typical propagation delay at 6 V. While it can drive larger capacitive loads, exceeding 70 pF may increase tpd unpredictably and risk output ringing; TI recommends limiting total load to ≤70 pF or adding a series resistor to control slew rate if heavier loads are unavoidable. The CD74HC14ME4 datasheet explicitly validates performance only up to 50 pF for guaranteed timing.

Does the CD74HC14ME4 require external pull-up or pull-down resistors on unused inputs?

No - unused inputs on the CD74HC14ME4 must be terminated to either VCC or GND, but not left floating. Direct connection is acceptable and preferred over resistive termination unless dynamic control is needed. TI's datasheet states that leaving inputs unconnected causes undefined states and increased power consumption; a 10-kΩ resistor is only recommended when the input may be repurposed later. The CD74HC14ME4 itself does not integrate internal pull resistors.

Can the CD74HC14ME4 operate reliably at 3.3 V supply voltage?

Yes - the CD74HC14ME4 is fully specified from 2 V to 6 V, including 3.3 V. At 3.3 V, its VT+ is 1.7 V (min), VT– is 0.9 V (max), and hysteresis is 0.4 V (min), ensuring robust noise immunity. Propagation delay is 34 ns (typ) with 50 pF load, and output drive meets ±4 mA (min) - sufficient for interfacing with 3.3 V microcontrollers and FPGAs. All parameters in the CD74HC14ME4 datasheet include 3.3 V test conditions.

Is the CD74HC14ME4 pin-compatible with the CD74HC14E (PDIP) version?

Yes - both CD74HC14ME4 (SOIC-14) and CD74HC14E (PDIP-14) share identical pin numbering, pin functions, and logic behavior. Pin 1 is 1A, Pin 2 is 1Y, Pin 7 is GND, Pin 14 is VCC, etc. The only differences are package type, thermal resistance, and moisture sensitivity level; no PCB redesign is needed when substituting between these variants. This pin compatibility is confirmed in TI's official CD74HC14 datasheet revision G.

What is the purpose of the hysteresis in the CD74HC14ME4, and how does it improve system reliability?

The hysteresis in the CD74HC14ME4 - defined as ΔVT = VT+ − VT− - creates two distinct input thresholds (e.g., 2.1 V and 1.2 V at 6 V), preventing output oscillation when input signals transition slowly or contain noise near the switching point. This eliminates contact bounce artifacts in switches and stabilizes marginal comparator outputs. For the CD74HC14ME4, minimum hysteresis is 0.6 V at 6 V, directly enabling reliable debouncing and noise rejection without external components - a core design advantage over standard CMOS inverters.