MC74VHC1G14DFT2G - Single Schmitt-Trigger Inverter, 2-5.5V CMOS | onsemi
Teilenummer: MC74VHC1G14DFT2G ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $0.45 | $0,45 |
| 10 | $0.38 | $3,80 |
| 100 | $0.27 | $27,00 |
| 500 | $0.22 | $110,00 |
| 1.000 | $0.18 | $180,00 |
| 3.000 | $0.14 | $420,00 |
MC74VHC1G14DFT2G Übersicht
An inverter is a fundamental single-input logic gate that produces a logical NOT of its input. Schmitt-trigger inverters extend this with hysteresis: the input threshold for a rising edge differs from that of a falling edge, which suppresses oscillation on slowly-changing signals and rejects noise on the input rail. This places the MC74VHC1G14 within the broader logic-gate hierarchy: inverter → NOT gate → CMOS logic → standard logic IC → semiconductor. Compared to a plain CMOS inverter, the Schmitt input offers a defined switching window specified as VP (positive threshold) and VN (negative threshold) in the datasheet, eliminating the indeterminate behavior of non-hysteretic gates when the input dwells in the transition region.
Key features include power-down protection on the inputs, balanced propagation delays, pin- and function-compatibility with other standard logic families, and a chip complexity of fewer than 100 FETs. The Pb-free package is qualified for modern reflow profiles, and the device is characterized over the -55 °C to +125 °C operating range. The MC74VHC1G14 has CMOS-level input thresholds; the MC74VHC1GT14 variant, sharing the same datasheet, offers TTL-level input thresholds for designers bridging from legacy 5 V TTL logic.
From an architectural standpoint, the three-stage internal buffer provides high DC gain while the Schmitt input stage sets the hysteresis band. Because it is a single-gate, single-channel part in a sub-2 mm² footprint, the MC74VHC1G14DFT2G is most often used as a 'helper' logic element - one inverter per chip - where board space is at a premium and a multi-channel gate would waste inputs.
Typical applications include oscillator and relaxation-timing circuits using an RC network at the input, button/keyboard debouncing, waveform shaping in sensor front-ends, simple logic-level inversion between 1.8 V, 3.3 V, and 5 V rails, and reset/power-good signal conditioning in microcontroller-based designs. The wide 2 V to 5.5 V supply range makes it equally at home on a coin-cell-powered IoT node and a 5 V industrial controller. The low quiescent current of 1 µA preserves battery life in always-on circuits.
When designing with this part, observe the maximum input rise/fall-time limits in the datasheet and place a 0.1 µF decoupling capacitor close to the VCC pin. Unused inputs must not be left floating - tie them to VCC or GND through a resistor to prevent shoot-through current and undefined switching. For drop-in replacement of the onsemi part, the TI SN74AHC1G14 and Nexperia 74AHC1G14 share the same pinout and function in compatible packages.
Drop-in-Alternativen für MC74VHC1G14DFT2G – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MC74VHC1G14DFT2G (gleiche Bauform und Footprint) – abweichend in Logic Family, Package, Propagation Delay (tPD), Quiescent Current (ICC).
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MC74VHC1G14DFT1G
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Datenblatt ansehen →MC74VHC1G14DFT2G-Q
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SN74AHC1G14DBVR
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74AHC1G14GW
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NL17SZ14DFT2G
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MC74VHC1G14DFT2G Grenzwerte & elektrische Eigenschaften
| Funktion | Single Schmitt-Trigger Inverter |
| Logic Family | 74VHC (CMOS) |
| Number of Gates | 1 |
| Number of Channels | 1 |
| Supply Voltage (VCC) | 2 V to 5.5 V |
| Input Threshold | CMOS-level (MC74VHC1G14); TTL-level (MC74VHC1GT14 variant) |
| Propagation Delay (tPD) | 3.5 ns (typ) at VCC = 5 V |
| Quiescent Current (ICC) | 1 µA (max) at TA = 25 °C |
| Betriebstemperatur | -55 °C to +125 °C |
| Gehäuse | SC-88A (SOT-353), 5 pins |
| Montageart | Surface Mount |
| Power-Down Protection | Provided on inputs |
| Balanced Propagation Delays | Yes |
| Chip Complexity | ≤ 100 FETs |
| Pb-Free / RoHS | Pb-free package available; RoHS compliant |
| Pin / Function Compatibility | Compatible with other standard logic families |
| Input Structure | Schmitt-trigger with hysteresis |
MC74VHC1G14DFT2G Pin-Konfiguration
| Pin 1 | NC — No connection (per datasheet, pin is not bonded internally) |
| Pin 2 | IN — Schmitt-trigger input (Input A) |
| Pin 3 | GND — Ground reference |
| Pin 4 | OUT — Inverted logic output (Output Y) |
| Pin 5 | VCC — Positive supply voltage (2 V to 5.5 V) |
Typische Anwendungen
MC74VHC1G14DFT2G ist geeignet für 7 Anwendungs: Relaxation Oscillator / Timing Circuit, Mechanical Switch / Button Debouncing, Logic-Level Inversion Between 1.8 V, 3.3 V, and 5 V Rails, Reset and Power-Good Signal Conditioning, Sensor Waveform Shaping and Edge Detection, Square-Wave Generator / Clock Source, Battery-Powered IoT Sleep-Mode Wake Circuit.
Relaxation Oscillator / Timing Circuit
The MC74VHC1G14DFT2G is widely used as a building block for RC relaxation oscillators, where the Schmitt-trigger hysteresis creates a clean square-wave output from a slow-rising RC charge/discharge cycle. With its 3.5 ns typical propagation delay at VCC = 5 V and 1 µA quiescent current per the onsemi datasheet, the part supports oscillator frequencies into the tens of megahertz while drawing negligible standby power. The wide 2-5.5 V supply range allows the same design to operate from 3.3 V or 5 V rails without modification, and the SC-88A footprint keeps the entire oscillator on a 2 mm × 2.1 mm land pattern. Compared to a 555 timer, this approach saves board area and avoids the timer's analog trimming requirements, at the cost of less frequency precision.
Empfohlen
Mechanical Switch / Button Debouncing
Mechanical pushbuttons and slide switches produce multiple transitions during contact bounce, which can confuse digital counters and state machines. The MC74VHC1G14DFT2G's Schmitt-trigger input eliminates this bounce by requiring the input to cross distinct rising and falling thresholds before the output changes, producing a single clean edge per press. With hysteresis built into a 5-pin SC-88A package and 1 µA quiescent current, the part adds essentially zero power overhead to battery-powered human-interface designs. Designers typically add a 10 kΩ pull-up and 100 nF filter capacitor to set the bounce time constant; the resulting debounced signal feeds directly into a microcontroller GPIO.
Empfohlen
Logic-Level Inversion Between 1.8 V, 3.3 V, and 5 V Rails
The MC74VHC1G14DFT2G operates from 2 V to 5.5 V VCC with CMOS-level input thresholds, making it a natural level shifter/inverter for unidirectional signals between common logic domains. The input accepts signals referenced to VCC while the output swings rail-to-rail, so a single part placed at the boundary converts a 3.3 V logic signal into its 5 V inverse, or vice versa. With 3.5 ns typical propagation delay at 5 V, the part adds negligible timing skew in clocked interfaces. Its SC-88A footprint fits next to any connector or signal trace, and its 1 µA quiescent current preserves power budget in always-on rails.
Empfohlen
Reset and Power-Good Signal Conditioning
Microcontroller reset inputs and supervisory power-good signals require clean, monotonic edges for reliable operation. The MC74VHC1G14DFT2G's Schmitt-trigger input rejects slow rise times on RC-filtered reset lines, while its low quiescent current of 1 µA keeps the supervisory path essentially zero-load on the system rail. Operating from 2-5.5 V, the part follows the same rail as the host MCU, eliminating any level-shifting concerns. The SC-88A package fits directly next to the reset pin header, keeping the PCB trace short and noise-free.
Empfohlen
Sensor Waveform Shaping and Edge Detection
Sensor front-ends - including Hall-effect, optical, and inductive sensors - often produce slow, low-amplitude analog waveforms that need to be converted to clean logic edges for a microcontroller counter or interrupt input. The MC74VHC1G14DFT2G's Schmitt-trigger hysteresis converts those slow analog transitions into sharp digital edges with deterministic timing. Its 3.5 ns propagation delay at VCC = 5 V preserves pulse-width fidelity on high-speed sensors, while 1 µA quiescent current keeps it suitable for low-duty-cycle sensor applications such as flow meters and tachometers.
Empfohlen
Square-Wave Generator / Clock Source
Two MC74VHC1G14DFT2G inverters can be cascaded with an RC network to form a classic ring-oscillator or crystal-stabilized square-wave generator. The Schmitt-trigger hysteresis ensures oscillation startup under all conditions, and the 3.5 ns propagation delay at VCC = 5 V per inverter sets a practical upper frequency limit in the hundreds of megahertz when used with external feedback. The wide 2-5.5 V supply range allows the same circuit to operate across portable and line-powered designs, and the SC-88A footprint lets the entire clock source fit beneath a 0603 passive on the PCB.
Empfohlen
Battery-Powered IoT Sleep-Mode Wake Circuit
In IoT edge nodes that spend most of their life in deep sleep, the MC74VHC1G14DFT2G serves as a 1 µA quiescent Schmitt-trigger that wakes the host MCU on a sensor event without leaking meaningful battery capacity. The 2-5.5 V supply range accommodates single-cell lithium, two-cell alkaline, and energy-harvested rails equally well. Power-down protection on the inputs means the part will not back-power the rail when VCC is removed, preserving the host's deep-sleep state. The SC-88A footprint fits beneath any sensor pad on the board.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MC74VHC1G14DFT2G – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MC74VHC1G14DFT1G | MC74VHC1G14DFT2G-Q | SN74AHC1G14DBVR | 74AHC1G14GW | NL17SZ14DFT2G |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Nexperia | onsemi |
| Package | SC-88A (SOT-353), 5-pin | SC-88A (SOT-353), 5-pin - same | SC-88A (SOT-353), 5-pin - same | SC-88A (SOT-353), 5-pin - same | SC-88A (SOT-353), 5-pin - same | SC-88A (SOT-353), 5-pin - same |
| Logic Family | 74VHC (CMOS thresholds) | 74VHC | 74VHC (AEC-Q100) | 74AHC | 74AHC | 74LCX |
| Supply Voltage (VCC) | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 1.65 V to 5.5 V |
| Propagation Delay (typ at 5 V) | 3.5 ns | 3.5 ns | 3.5 ns | ~5 ns (AHC family) | ~5 ns (AHC family) | ~3.5 ns (LCX family) |
| Quiescent Current (max) | 1 µA | 1 µA | 1 µA | 1 µA (AHC) | 1 µA (AHC) | 1 µA (LCX) |
| Automotive Grade | No | No | Yes (AEC-Q100) | No (Q1 suffix available) | No | No |
| Approx Unit Price (qty 1, USD) | $0.45 | $0.45 | $0.55 | $0.40 | $0.42 | $0.38 |
Wichtigste Unterscheidungsmerkmale
- CMOS-level input thresholds for clean rail-referenced switching (vs. MC74VHC1GT14 (TTL-level variant))
- AEC-Q100 automotive-qualified sibling available in same footprint (vs. TI SN74AHC1G14DBVR (industrial only))
- Highest speed in the 74x1G14 SC-88A family (vs. SN74AHC1G14 (AHC family))
Designhinweise
Estimated: at VCC = 5 V, a quiescent supply current of 1 µA maximum means a 3000-piece reel in deep sleep draws less than 3 mA-hours per year - negligible for battery budget. Place a 0.1 µF X7R decoupling capacitor within 3 mm of the VCC pin to suppress noise coupling during output transitions, which can momentarily draw higher dynamic currents on edge edges.
Inputs must never be left floating on the MC74VHC1G14 - a floating input can drift into the threshold region and cause shoot-through current plus undefined output toggling. Tie unused inputs to VCC or GND through a 10 kΩ resistor (or directly when drive is not a concern). When using the input as a slow analog signal, ensure the input rise/fall time stays within the datasheet's maximum rating, otherwise the output may oscillate within the hysteresis band.
Although the SC-88A footprint is tiny, route input and output traces on separate layers or with a ground guard between them to prevent positive feedback that could turn the Schmitt trigger into a parasitic oscillator at high frequencies. Keep the VCC trace short and wide, and avoid running noisy switching signals adjacent to pin 2 (input) on the same layer.
Estimated: the 3.5 ns typical propagation delay at VCC = 5 V implies an output rise/fall time on the order of 1-2 ns, which can excite resonances in traces longer than about 25 mm. For high-speed designs above 50 MHz, treat the SC-88A output as a transmission line and add a series damping resistor if ringing exceeds the input hysteresis band of the downstream device.
Compliance-Informationen
Pb-free package available per onsemi datasheet. Standard MC74VHC1G14DFT2G is not AEC-Q100 qualified; choose -Q suffix for automotive applications. REACH compliance status per onsemi product page.
