MC74VHC1G14DFT1G - Single Schmitt-Trigger Inverter, SC-88A / SC-70-5
MPN： MC74VHC1G14DFT1G ✓ 啟用中MC74VHC1G14DFT1G 概覽
A Schmitt-trigger inverter is a single-input logic gate whose transfer characteristic includes a defined upper and lower threshold voltage (hysteresis), making the device immune to slow or noisy input edges. The MC74VHC1G14 sits within the broader logic-gate family (inverter -> NOT gate -> combinational logic -> CMOS logic -> standard logic IC), and the 74VHC sub-family delivers Bipolar-Schottky-TTL-class speed at a fraction of the quiescent power.
Key features include CMOS-level input thresholds (the MC74VHC1GT14 variant provides TTL-level thresholds), 8 mA output drive capability at 5 V, 1 µA maximum quiescent supply current at 25 °C, power-down protection on the inputs, and internal ESD protection. The hysteresis characteristic is typically 1.5 V at 5 V supply, eliminating oscillations on slowly changing signals and improving noise margin in harsh environments.
The architecture uses three internal stages with a buffered output stage, providing high noise immunity and stable output swings rail-to-rail. The internal FET count is ≤ 100, contributing to its tiny footprint and low dynamic power. Pb-free packages are available, and the device is designed for 1.65 V to 5.5 V Vcc operation, allowing direct interfacing between 3.3 V and 5 V logic domains.
Typical applications include signal conditioning for mechanical switch debouncing, waveform shaping in oscillator and pulse-generator circuits, level translation between 5 V and 3.3 V logic, microcontroller reset and wake-up pulse generation, and general-purpose logic inversion in portable, industrial, and consumer electronics where board space is at a premium.
Design consideration: although the part tolerates input voltages up to 7 V even with Vcc = 0 V, designers must still respect the absolute-maximum input rating and avoid persistent over-voltage stress. Decouple Vcc with a 0.1 µF ceramic capacitor placed within a few millimeters of the supply pin.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives in the same SC-88A footprint, comparison parameters, and practical design notes beyond what the manufacturer datasheet alone provides, giving engineers a one-stop reference for sourcing and qualifying the MC74VHC1G14DFT1G.
直接替換替代品，適用於 MC74VHC1G14DFT1G — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC74VHC1G14DFT1G （相同外形與佔位） — 差異在於 Package, Logic Family, Operating Temperature, Output Drive Current, Propagation Delay (tPD).
MC74VHC1G14DFT2G
✅ 直接替換聯絡詢價
查看資料表 →MC74VHC1G14DTT1G
✅ 直接替換📋 參考替代品（不在目錄中）
MC74VHC1G14DFT1G-Q
✅ 直接替換📋 參考替代品（不在目錄中）
M74VHC1GT50DFT1G
✅ 直接替換聯絡詢價
查看資料表 →SN74LVC1G14DBVR
✅ 直接替換聯絡詢價
查看資料表 →74LVC1G14GW
✅ 直接替換📋 參考替代品（不在目錄中）
74HC1G14GW-G
✅ 直接替換📋 參考替代品（不在目錄中）
MC74VHC1G14DFT1G 最大額定值與電氣特性
| 功能 | Single Schmitt-Trigger Inverter |
| Number of Channels | 1 |
| Number of Inputs | 1 |
| 輸出數量 | 1 |
| Logic Family | 74VHC (High-Speed CMOS) |
| Input Thresholds | CMOS-level (MC74VHC1G14); TTL-level for MC74VHC1GT14 |
| Supply Voltage (Vcc) | 2 V to 5.5 V (operating) |
| Designed Vcc Range | 1.65 V to 5.5 V |
| Absolute-Maximum Input Voltage | 7 V (regardless of Vcc) |
| Output Drive Current | 8 mA |
| Propagation Delay (tPD) | 3.5 ns typical at VCC = 5 V |
| Quiescent Current (ICC) | 1 µA maximum at TA = 25 °C |
| 工作溫度 | -55 °C to +125 °C |
| 封裝 | SC-88A / SC-70-5 / SOT-353 (5-pin) |
| 安裝類型 | Surface Mount |
| Input Protection | Power-down protection on inputs |
| Internal FET Count | ≤ 100 |
| Lead-Free / RoHS | Pb-free packages available; RoHS compliant |
MC74VHC1G14DFT1G 腳位配置
| 腳位 1 | NC — No Connect (unused pin, may be left floating per datasheet) |
| 腳位 2 | IN A — Logic input with Schmitt-trigger hysteresis |
| 腳位 3 | GND — Ground reference |
| 腳位 4 | OUT Y — Inverted logic output |
| 腳位 5 | VCC — Supply voltage, 2 V to 5.5 V |
典型應用
MC74VHC1G14DFT1G 適用於 6 應用s: Mechanical Switch Debouncing, RC Oscillator and Pulse Generator, 5 V to 3.3 V Logic Level Translation, Microcontroller Reset Pulse Generation, Portable Consumer and Wearable Electronics, Industrial Sensor Signal Conditioning.
Mechanical Switch Debouncing
The MC74VHC1G14DFT1G is well matched to mechanical-switch debouncing because its Schmitt-trigger hysteresis (typically 1.5 V at 5 V supply) rejects the contact bounce that plagues mechanical switches and push-buttons. Placing the inverter between the switch and a microcontroller GPIO eliminates spurious edges without RC filter + comparator circuits, saving board area. The 1 µA quiescent current keeps power consumption negligible in battery-powered human-interface designs, and the 8 mA drive lets the same inverter also drive an LED indicator directly.
推薦
RC Oscillator and Pulse Generator
The MC74VHC1G14DFT1G forms a compact two-component RC oscillator by connecting an RC network from the output back to the input, exploiting its Schmitt-trigger transfer characteristic. With a 5 V supply and reasonable RC values the device produces a stable square wave in the kHz-to-MHz range useful for clock generation, watchdog timing, and simple PWM. The 3.5 ns typical propagation delay at 5 V limits maximum oscillation frequency and must be accounted for in the timing analysis. Designers should add a buffer gate if loading the output would otherwise slow the oscillator.
推薦
5 V to 3.3 V Logic Level Translation
The MC74VHC1G14DFT1G simplifies 5 V-to-3.3 V level translation because its inputs tolerate up to 7 V regardless of Vcc, while powered from a 3.3 V rail it produces 3.3 V-compatible output swings. This allows direct interfacing of legacy 5 V peripheral signals to modern 3.3 V microcontrollers without a dedicated level-shifter IC. The CMOS-level input thresholds (different from the TTL-threshold MC74VHC1GT14 variant) make it the right choice when the upstream driver is CMOS. Power-down protection on the inputs prevents back-powering when Vcc is removed but the 5 V source remains.
推薦
Microcontroller Reset Pulse Generation
The MC74VHC1G14DFT1G can stretch and invert a brief reset or wake-up pulse from a microcontroller or supervisor, providing the rail-to-rail swing needed to drive downstream logic reliably. The buffered three-stage output stage maintains stable logic levels even with slow input transitions, eliminating metastability concerns. The -55 °C to +125 °C operating range suits industrial and outdoor equipment, while the tiny SC-88A footprint fits in space-constrained sensor modules. A 0.1 µF Vcc decoupling capacitor placed within 5 mm of pin 5 is essential for clean reset edges.
推薦
Portable Consumer and Wearable Electronics
The MC74VHC1G14DFT1G is well suited to portable and wearable electronics thanks to its 1 µA quiescent current and 2 V to 5.5 V Vcc range that covers single-cell lithium and coin-cell battery chemistries. Designers use it for signal conditioning of sensor outputs (touch buttons, accelerometers, MEMS microphones) and for inverting logic signals in ultra-compact PCB layouts. The 5-pin SC-88A package occupies only 2.0 × 1.25 mm of board area, leaving room for batteries and antennas in wearables. Pb-free, RoHS-compliant construction satisfies consumer product environmental requirements.
推薦
Industrial Sensor Signal Conditioning
In industrial sensor interfaces the MC74VHC1G14DFT1G cleans up noisy transducer outputs before they reach an ADC or microcontroller. Its Schmitt-trigger hysteresis rejects the high-frequency EMI common on factory floors, and the 7 V input tolerance protects the device from ESD transients and 24 V loop-cross faults when paired with external series resistance. The -55 °C to +125 °C operating temperature range supports outdoor and unconditioned industrial enclosures. The onsemi AEC-Q100 qualified -Q variant (MC74VHC1G14DFT1G-Q) is required for automotive in-cabin applications.
推薦
推薦產品摘要
工程參考資料，適用於 MC74VHC1G14DFT1G — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC74VHC1G14DFT2G | MC74VHC1G14DTT1G | MC74VHC1G14DFT1G-Q | SN74LVC1G14DBVR | 74LVC1G14GW |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | Nexperia |
| Package | SC-88A / SC-70-5 / SOT-353 (5-pin) | SC-88A / SC-70-5 / SOT-353 - same | SC-88A / SC-70-5 / SOT-353 - same | SC-88A / SC-70-5 / SOT-353 - same | SOT-23-5 (pin-compatible, verify land pattern) | SC-88 / SOT-353-5 - same |
| 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 | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Output Drive Current | 8 mA | 8 mA | 8 mA | 8 mA | 24 mA | 24 mA |
| Propagation Delay (typ at 5V) | 3.5 ns | 3.5 ns | 3.5 ns | 3.5 ns | 2.5 ns | 2.5 ns |
| Quiescent Current (max) | 1 µA at 25 °C | 1 µA at 25 °C | 1 µA at 25 °C | 1 µA at 25 °C | 10 µA | 10 µA |
| Input Threshold | CMOS-level | CMOS-level | CMOS-level | CMOS-level | CMOS (LVC) | CMOS (LVC) |
| Automotive Grade (AEC-Q100) | No | No | No | Yes | No - use SN74LVC1G14QDCKRQ1 for automotive | No |
主要差異化特點
- Best-in-class 1 µA quiescent current (對比SN74LVC1G14DBVR)
- Automotive-qualified variant available on same footprint (對比SN74LVC1G14DBVR)
- Pin-compatible drop-in family covers CMOS and TTL thresholds (對比74LVC1G14GW)
設計說明
Always decouple Vcc (pin 5) with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin. Without local decoupling, the output transitions can cause Vcc droop that corrupts the Schmitt-trigger threshold and creates jitter on the output. Avoid routing noisy signal traces directly under the inverter footprint; the SC-88A package has an exposed lead frame that can pick up switching noise.
The SC-88A / SOT-353 5-pin package has one unused pin (pin 1, NC). This pin may be left floating or tied to either Vcc or GND on the PCB. Best practice is to tie NC to GND to provide additional thermal mass and a defined reference, but it is not electrically required. Keep all traces short and avoid stubs; the 3.5 ns typical propagation delay means impedance discontinuities above 50 Ω can produce reflections on fast edges.
When using the MC74VHC1G14DFT1G to clean up slowly rising signals, calculate the worst-case rise time and verify it falls within the Schmitt-trigger hysteresis window. At 5 V Vcc the typical positive-going threshold (VT+) is around 2.7 V and the negative-going threshold (VT-) is around 1.5 V, giving ~1.2 V of hysteresis. Input rise times slower than 1 µs may still pass through the linear region and slow the output transition; for very slow signals, consider adding a small RC differentiator ahead of the input.
合規資訊
Pb-free packages are available per onsemi datasheet; RoHS and REACH compliant. For AEC-Q100 automotive qualification, use the MC74VHC1G14DFT1G-Q variant.
