MC74VHC1G14DFT2G - Single Schmitt-Trigger Inverter, 2-5.5V CMOS | onsemi
MPN: MC74VHC1G14DFT2G ✓ Hoạt độngMC74VHC1G14DFT2G Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MC74VHC1G14DFT2G — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC74VHC1G14DFT2G (cùng hình factor và footprint) — khác nhau ở Logic Family, Package, Propagation Delay (tPD), Quiescent Current (ICC).
MC74VHC1G14DFT1G
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC74VHC1G14DFT2G-Q
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN74AHC1G14DBVR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
74AHC1G14GW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
NL17SZ14DFT2G
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
74LVC1G14GW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC74VHC1G14DFT2G Tỷ lệ tối đa & tính chất điện
| Chức năng | 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 |
| Nhiệt độ hoạt động | -55 °C to +125 °C |
| Hộp | SC-88A (SOT-353), 5 pins |
| Kiểu lắp đặt | 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 |
Cấu hình chân MC74VHC1G14DFT2G
| Chân 1 | NC — No connection (per datasheet, pin is not bonded internally) |
| Chân 2 | IN — Schmitt-trigger input (Input A) |
| Chân 3 | GND — Ground reference |
| Chân 4 | OUT — Inverted logic output (Output Y) |
| Chân 5 | VCC — Positive supply voltage (2 V to 5.5 V) |
Ứng dụng tiêu biểu
MC74VHC1G14DFT2G phù hợp cho 7 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC74VHC1G14DFT2G — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- CMOS-level input thresholds for clean rail-referenced switching (vsMC74VHC1GT14 (TTL-level variant))
- AEC-Q100 automotive-qualified sibling available in same footprint (vsTI SN74AHC1G14DBVR (industrial only))
- Highest speed in the 74x1G14 SC-88A family (vsSN74AHC1G14 (AHC family))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
