onsemi 74VHC14MTC

Overview

74VHC14MTC from Fairchild Semiconductor is a hex Schmitt-trigger inverter IC designed for noise-immune signal conditioning in digital logic interfaces. It delivers 5.5 ns typical propagation delay at 5 V, supports 2.0–5.5 V supply operation, features ±25 mA output drive, and operates across –40°C to +85°C - enabling robust level-shifting between 3 V and 5 V systems.

For engineers reviewing the 74VHC14MTC datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, TSSOP-14 package mapping, hysteresis thresholds (VP = 3.85 V / VN = 1.65 V at VCC = 5.5 V), input protection up to 7 V, and confirmed compatibility with 74HC14 logic families.

Technical Context

The 74VHC14MTC implements six independent Schmitt-trigger inverters using silicon-gate CMOS technology, achieving TTL-compatible speed while maintaining microamp-level quiescent current. Its hysteresis (0.5–1.6 V at 5.5 V) enables clean edge regeneration of slow-rising signals, and input protection circuitry allows safe interfacing across mismatched supply domains (e.g., 5 V inputs into 3 V systems).

Each gate exhibits rail-to-rail output swing, 10 pF typical input capacitance, and guaranteed dynamic noise immunity (VIHD ≥ 3.5 V, VILD ≤ 1.5 V at 5 V/50 pF). Propagation delay remains stable across load capacitances (15–50 pF) and temperature extremes, supporting reliable timing in mixed-voltage embedded control and sensor interface circuits.

Key Specifications

Pinout & Package

TSSOP-14 package (JEDEC MO-153, 4.4 mm wide), 1.2 mm max height, 0.65 mm lead pitch, gull-wing leads. RoHS-compliant, moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV14APW and MC74VHC14DT, the 74VHC14MTC offers superior hysteresis depth and propagation speed in the TSSOP-14 form factor - making it optimal for compact, noise-prone applications like portable instrumentation and motor control feedback paths.

Availability

74VHC14MTC is available at Aetrix Electronics and suitable for industrial automation, sensor interface design, and embedded control systems requiring stable component supply, long-term lifecycle support, and consistent TSSOP-14 packaging.

Supply support for 74VHC14MTC 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

Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; its legacy VHC logic family remains widely deployed and supported.

The 74VHC14MTC belongs to the Very High Speed CMOS (VHC) logic family, engineered for applications demanding TTL-speed performance with CMOS power efficiency - especially in noise-sensitive digital interfaces and mixed-voltage system interconnects.

FAQ

What is the maximum input voltage rating for the 74VHC14MTC?

The 74VHC14MTC supports DC input voltages from –0.5 V to +7.0 V, independent of VCC. This allows safe interfacing of 5 V signals into 3.3 V systems without external protection components. The input protection circuit prevents latch-up or damage even when VIN exceeds VCC, making the 74VHC14MTC ideal for mixed-supply environments where voltage sequencing cannot be guaranteed.

Does the 74VHC14MTC require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs on the 74VHC14MTC must be tied HIGH or LOW; floating inputs are not permitted. The datasheet explicitly states that unused inputs may not float, as they can cause excessive ICC, unpredictable output states, or increased susceptibility to noise. For reliability, tie each unused input directly to VCC or GND using short traces - no resistors needed due to the device's internal input protection.

What is the hysteresis voltage of the 74VHC14MTC at 5 V supply?

At VCC = 5.0 V, the 74VHC14MTC exhibits a hysteresis voltage (VH) of 0.40–1.40 V (min–max), with a typical value of ~0.9 V. This corresponds to approximately 28% of VCC, providing robust noise rejection for signals with slow edges or moderate EMI. The exact thresholds are VP = 3.15 V (positive-going) and VN = 1.35 V (negative-going), ensuring clean, bounce-free transitions in switch or sensor applications.

Can the 74VHC14MTC drive standard TTL loads?

Yes - the 74VHC14MTC can directly drive standard TTL loads. With an output drive capability of ±8 mA at VCC = 5 V, it meets the input current requirements of 74LS and 74F families (IIH ≤ 20 μA, IIL ≤ –0.4 mA). Its VOL ≤ 0.44 V and VOH ≥ 4.4 V at 5 V ensure full logic-level compatibility, making the 74VHC14MTC suitable for bridging VHC and legacy TTL subsystems without additional buffering.

Is the 74VHC14MTC pin-compatible with the 74HC14?

Yes - the 74VHC14MTC is pin- and function-compatible with the 74HC14. Both share identical TSSOP-14 pinouts, truth tables, and logic behavior. However, the 74VHC14MTC offers tighter propagation delay (5.5 ns vs. 12 ns typical), lower ICC (2 μA vs. 4 μA max), and enhanced input protection (up to 7 V), making it a performance- and reliability-upgraded drop-in replacement for 74HC14 in new designs or field upgrades.