onsemi MC74VHC14DR2

Overview

MC74VHC14DR2 from onsemi is a hex Schmitt-trigger inverter IC designed for noise-immune signal conditioning in digital systems. It features six independent inverters with hysteresis (VT+ = 3.85 V, VT− = 1.65 V at VCC = 5.5 V), 5.5 ns typical propagation delay at 5.0 V, CMOS-level input compatibility, and full 5.0 V rail-to-rail output swing - enabling reliable interfacing between slow or noisy signals and downstream logic in industrial control and sensor interface circuits.

For engineers reviewing the MC74VHC14DR2 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-14 package details, Schmitt-trigger threshold behavior, noise immunity metrics (VNIH = VNIL = 28% VCC), and validated alternatives for level-shifting, debouncing, and waveform shaping use cases.

Technical Context

The MC74VHC14DR2 implements silicon-gate CMOS Schmitt-trigger logic with three-stage internal buffering to ensure high noise immunity and stable output transitions. Its hysteresis (VH = 0.50 V typ at VCC = 5.5 V) enables clean squaring of slow-rising/falling inputs - critical for switch debouncing and analog-to-digital signal conditioning.

Input structures tolerate up to 5.5 V regardless of VCC (2.0–5.5 V), supporting mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V loads). Output stages deliver ±25 mA drive capability and full CMOS-level swings, with no power-down protection required on inputs - distinguishing it from the TTL-compatible MC74VHCT14A variant.

Key Specifications

Pinout & Package

MC74VHC14DR2 is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package, case 751A, with standard 1.27 mm pitch and Pb-free finish (suffix "G"). Dimensions: 8.75 × 4.00 × 1.75 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV14APWR and 74HC14D,653, the MC74VHC14DR2 offers superior wide-temperature support (−55°C to +125°C), tighter hysteresis control (0.50 V typ), and guaranteed 2.0 V minimum operation - making it optimal for ruggedized industrial and automotive-adjacent signal conditioning.

Availability

MC74VHC14DR2 is available at Aetrix Electronics and suitable for industrial control panels, sensor interface modules, and embedded debouncing circuits requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MC74VHC14DR2 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC74VHC14DR2 belongs to onsemi's high-speed CMOS logic family, engineered specifically for robust signal integrity in electrically noisy environments - targeting applications like factory automation, motor control feedback, and precision sensor interfacing.

FAQ

What is the maximum operating temperature range for the MC74VHC14DR2?

The MC74VHC14DR2 is rated for operation from −55°C to +125°C, as confirmed in the Recommended Operating Conditions table of the official datasheet. This extended temperature range supports deployment in harsh industrial environments such as motor drives, outdoor instrumentation, and under-hood automotive subsystems where thermal stability is critical. The MC74VHC14DR2 maintains specified performance across this full range without derating.

Does the MC74VHC14DR2 support 3.3 V logic inputs while powered from 5 V?

Yes, the MC74VHC14DR2 fully supports 3.3 V logic inputs when powered from 5 V. Its CMOS-compatible inputs accept VIH ≥ 3.5 V and VIL ≤ 1.5 V (per Noise Characteristics table), and input structures tolerate up to 5.5 V regardless of VCC. This allows safe and functional interfacing between 3.3 V microcontrollers and 5 V peripheral logic without external level-shifting circuitry - a key advantage over TTL-compatible variants like MC74VHCT14A.

How does the hysteresis of the MC74VHC14DR2 improve noise immunity?

The MC74VHC14DR2 provides 28% VCC noise immunity (VNIH = VNIL = 28% VCC) due to its Schmitt-trigger hysteresis - meaning VT+ − VT− = 0.50 V typical at 5.5 V supply. This creates distinct high-to-low and low-to-high switching thresholds, preventing multiple toggles from noise spikes within the hysteresis window. For example, at 5 V, noise up to ±250 mV can be rejected without false triggering - essential for reliable switch debouncing and sensor signal conditioning.

Can unused inputs on the MC74VHC14DR2 be left floating?

No, unused inputs on the MC74VHC14DR2 must never be left floating. Per the datasheet's Recommended Operating Conditions note, all unused inputs must be tied to a defined logic level - either VCC or GND - to prevent undefined output states, increased power consumption, and potential device instability. Floating CMOS inputs can drift into the linear region, causing excessive current draw and thermal stress. Always terminate unused A1–A6 pins explicitly.

Is the MC74VHC14DR2 pin-compatible with the MC74VHCT14A?

Yes, the MC74VHC14DR2 is pin- and function-compatible with the MC74VHCT14A, as explicitly stated in the datasheet: "The MC74VHC14/MC74VHCT14A pin configuration and function are the same." Both share identical SOIC-14 pinouts (A1–A6 inputs on odd pins, Y1–Y6 outputs on even pins, VCC on pin 14, GND on pin 7). However, their input thresholds differ: MC74VHC14DR2 uses CMOS-level thresholds, while MC74VHCT14A is TTL-compatible - requiring careful selection based on source logic family.