M74HC14 - Hex Schmitt Inverter, 6-Channel, CMOS | STMicroelectronics
부품 번호: M74HC14 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.29 | $29.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.17 | $170.00 |
M74HC14 개요
A Schmitt trigger inverter is a digital logic building block that converts a slowly-changing or noisy input waveform into a clean, sharply-transitioning output by using two different switching thresholds: VT+ for the low-to-high transition and VT- for the high-to-low transition. The voltage gap between these thresholds is called hysteresis. Compared with a standard CMOS inverter, a Schmitt trigger is far more tolerant of noisy, slowly-rising, or analog-style input signals, which makes it the standard choice for line receivers, RC oscillators, debounce circuits, and waveform shapers. Within the broader taxonomy, the M74HC14 sits inside the 74HC logic family, which itself belongs to CMOS logic ICs and the wider semiconductor category.
Key features include a wide operating voltage range from 2 V to 6 V, 1.2 V typical noise immunity at VCC = 6 V, balanced propagation delays tPLH/tPHL, ESD protection on all inputs, and CMOS-compatible low quiescent current. The Schmitt hysteresis is specified as 20% of VCC, which scales automatically across the supply range, giving reliable switching margins in 3.3 V and 5 V rails alike.
The device is built using silicon-gate C2MOS technology, which combines the high-speed LSTTL-class switching performance of bipolar TTL with the low static power consumption inherent to CMOS. Internal diode clamps protect inputs against ESD and latch-up, while the symmetrical output stage provides equal source and sink drive strength so edges remain matched under capacitive loading.
Typical applications include waveform shaping and line receivers in industrial control, debounce circuits for mechanical switches and keypads, RC relaxation oscillators for clock generation, monostable and astable multivibrators, and signal conditioning between noisy sensors and downstream logic. Its six channels are common in PCB digital designs for handshake-overs signal lines, sensors, or power-management blocks.
When using M74HC14 in oscillator or debounce circuits, choose leakage and hysteresis parameters to balance timing accuracy against power consumption. Input rise/fall times must remain slower than the internal hysteresis response or pulse stretching will distort the output duty cycle.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: M74HC14 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
M74HC14YRM13TR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
SN74HC14DR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC74HC14ADR2G
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
74HC14D,653
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
CD74HC14M96
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
M74HC14 최대 정격 & 전기적 특성
| Logic Type | Hex Schmitt Trigger Inverter |
| Number of Channels | 6 |
| Number of Inputs | 1 per channel (6 total) |
| 출력 수 | 1 per channel (6 total) |
| Logic Family | 74HC / High-Speed CMOS |
| Process Technology | Silicon-gate C2MOS |
| Operating Voltage Range (VCC) | 2 V to 6 V |
| Input Hysteresis | 20% of VCC (typ.) |
| Propagation Delay (tPD) | 12 ns (typ.) at VCC = 6 V |
| Output Drive Current (IOH/IOL) | 4 mA (min) |
| Noise Immunity (VNIH/VNIL) | 1.2 V (typ.) at VCC = 6 V |
| 동작 온도 범위 | -55C to +125C |
| 패키지 | 14-pin SO (SOIC-14) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant (ST Automotive Logic ICs portfolio) |
| Pinout Compatibility | Identical to M74HC04 |
M74HC14 핀 구성
| 핀 1 | 1A — Input 1 (Schmitt trigger) |
| 핀 2 | 1Y — Output 1 (inverted) |
| 핀 3 | 2A — Input 2 (Schmitt trigger) |
| 핀 4 | 2Y — Output 2 (inverted) |
| 핀 5 | 3A — Input 3 (Schmitt trigger) |
| 핀 6 | 3Y — Output 3 (inverted) |
| 핀 7 | GND — Ground |
| 핀 8 | 4Y — Output 4 (inverted) |
| 핀 9 | 4A — Input 4 (Schmitt trigger) |
| 핀 10 | 5Y — Output 5 (inverted) |
| 핀 11 | 5A — Input 5 (Schmitt trigger) |
| 핀 12 | 6Y — Output 6 (inverted) |
| 핀 13 | 6A — Input 6 (Schmitt trigger) |
| 핀 14 | VCC — Positive supply voltage |
일반적인 애플리케이션
M74HC14 적합 용도: 7 애플리케이션s: Mechanical Switch Debounce, RC Relaxation Oscillator, Slow-Edge Line Receiver, Waveform Shaper / Squarer, Automotive Signal Conditioning, Power-Good / Reset Pulse Generator, Hobby / Education Logic Projects.
Mechanical Switch Debounce
The M74HC14's 20% VCC Schmitt hysteresis makes it a textbook choice for debouncing mechanical switches and relay contacts in industrial panels. Each of the six channels absorbs contact bounce within roughly 1 us without software filtering, so a single SOIC-14 cleans up six switches at once. Pair a 10 kohm pull-up with the switch to VCC, then size a 100 nF cap to ground if bounce exceeds 5 ms - typical for low-cost tact switches. Compared to a discrete RC + comparator solution, the M74HC14 cuts part count, PCB area, and BOM cost while surviving -55C to +125C ambient swings common in factory automation cabinets.
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RC Relaxation Oscillator
A single M74HC14 channel plus one resistor and one capacitor forms a classic astable relaxation oscillator for clock generation in cost-sensitive designs. Frequency follows roughly f = 1/(0.8 x R x C) using the 20% VCC Schmitt thresholds, giving sub-Hz to several MHz coverage - useful for blinkers, watchdog kickers, and tone generators. The 12 ns propagation delay caps practical upper frequency near 10 MHz at 6 V VCC, while the symmetrical 4 mA drive cleanly swings the output rail-to-rail for downstream CMOS loads. Designers prefer the M74HC14 here because three independent oscillators fit in one SOIC-14.
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Slow-Edge Line Receiver
The M74HC14's Schmitt trigger action cleans up signals arriving over long cables or from sensors with slow analog-style rise times, classic in industrial fieldbus and process-control nodes. The 20% VCC hysteresis eliminates the multiple-transition glitches that plague standard CMOS receivers when rise times exceed 1 us, while the 2 V to 6 V supply range interfaces directly with 3.3 V and 5 V logic domains. Typical circuits place a 10 kohm series resistor plus a 100 pF cap at the input to form a low-pass filter, then feed the M74HC14 to regenerate a clean digital edge.
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Waveform Shaper / Squarer
Engineers frequently route sine, triangular, or otherwise-analog waveforms through an M74HC14 to produce a clean logic-level square wave for frequency counting, F/V conversion, or threshold detection. The 20% VCC Schmitt band provides well-defined VT+ and VT- points that scale with supply, while the symmetrical 4 mA drive handles fan-out to multiple counters or microcontrollers. Typical audio-to-digital front ends place a 10 nF AC-coupling capacitor at the input, biased to VCC/2 with two 100 kohm resistors, then feed one M74HC14 channel to convert the sine into a 50 Hz square wave for tachometer logic.
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Automotive Signal Conditioning
The M74HC14 qualifies under ST's automotive logic portfolio and tolerates the -55C to +125C ambient swings found under-the-hood. Six channels per package make it a compact solution for conditioning crank/cam sensor edges, switch inputs, and noisy digital buses before they reach a vehicle MCU. The 4 mA drive cleanly interfaces with 5 V automotive MCUs, while the wide 2 V to 6 V supply margin survives load-dump transients when paired with a TVS clamp. Designers typically source the M74HC14YRM13TR variant for AEC-Q100 traceability.
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Power-Good / Reset Pulse Generator
A pair of M12 channels forms a classic power-on-reset generator that holds a downstream MCU or supervisor in reset until the supply stabilizes. The Schmitt hysteresis prevents chatter when VCC ramps slowly, while the 4 mA drive cleanly triggers reset inputs on common 3.3 V and 5 V supervisors. A typical circuit RC-times the first inverter, then the second inverts back to produce an active-low reset pulse of defined width. Designers appreciate that the M74HC14 leaves 4 unused channels for unrelated housekeeping logic on the same PCB.
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Hobby / Education Logic Projects
The M74HC14 is a favorite of students, makers, and breadboard builders because it combines six independent logic gates with forgiving hysteresis in one low-cost SOIC-14 or DIP-14. Common projects include LED flashers, square-wave audio tone generators, simple touch sensors, and logic-level translators using the wide 2 V to 6 V supply range. The 4 mA drive directly lights typical indicator LEDs with a 470 ohm series resistor, and the 12 ns propagation supports audio-range and low-RF experiments. Hobby distributors stock the M74HC14 in both through-hole DIP and surface-mount SOIC, often under 0.20 USD at 1,000-piece reels.
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추천 제품 요약
엔지니어링 참조 데이터: M74HC14 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | M74HC14YRM13TR | SN74HC14DR | MC74HC14ADR2G | 74HC14D,653 | CD74HC14M96 |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | Texas Instruments | onsemi | Nexperia | Texas Instruments |
| Package | SO-14 | SO-14 - same | SOIC-14 - same | SOIC-14 - same | SO-14 - same | SOIC-14 - same |
| Operating Voltage (VCC) | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V |
| Propagation Delay (typ. at 6 V) | 12 ns | 12 ns | 12 ns | 13 ns | 13 ns | 14 ns |
| Input Hysteresis | 20% VCC | 20% VCC | 20% VCC | 20% VCC | 20% VCC | 20% VCC |
| Output Drive (IOH/IOL min) | 4 mA | 4 mA | 4 mA | 4 mA | 4 mA | 4 mA |
| Automotive Grade | Yes (ST Automotive Logic portfolio) | Yes (AEC-Q100) | No (industrial) | No (industrial) | No (industrial) | No (industrial) |
| Operating Temperature | -55C to +125C | -55C to +125C | -40C to +85C | -55C to +125C | -40C to +125C | -55C to +125C |
| Approx. Unit Price (qty 1, as of 2026-10-05) | 0.45 USD | 0.45 USD | 0.42 USD | 0.38 USD | 0.40 USD | 0.36 USD |
주요 차별점
- Six independent Schmitt inverters in a single 14-pin SOIC (vs Discrete transistor + comparator debounce circuit)
- Pin-to-pin compatibility with the M74HC04 standard hex inverter (vs M74HC04 (no Schmitt hysteresis))
- Automotive-grade variant (M74HC14YRM13TR) qualified to AEC-Q100 (vs Industrial-only competitors like CD74HC14M96)
설계 노트
Estimated: at VCC = 5 V and quiescent current ICC near 2 uA per package (typical CMOS 74HC value, [DATA_NEEDED] from datasheet), six channels contribute negligible idle draw. Add a 100 nF decoupling capacitor within 5 mm of the VCC pin and a 10 uF bulk cap on the supply rail. The wide 2 V to 6 V range means the same part serves both 3.3 V and 5 V logic rails without level shifters, simplifying multi-rail designs.
Do not parallel M74HC14 outputs to increase drive current - the CMOS output stages will source/sink into each other and may exceed package dissipation. Each of the six channels shares the same GND and VCC; if any single output shorts to VCC or GND, the entire device can be damaged. Always include a series resistor on outputs driving off-board connectors to limit fault current.
Place the M74HC14 close to the noisy input source to capture clean edges before they pick up PCB-level noise. Keep input traces short and away from switching converter inductors or relay coils. For RC oscillator designs, place the timing resistor and capacitor adjacent to the relevant pins to minimize parasitic capacitance, which can shift oscillation frequency by 10-20% in breadboard or hand-wired layouts.
The 20% VCC Schmitt hysteresis is the key noise-rejection feature; ensure input rise and fall times stay slower than ~1 microsecond for the threshold gap to remain effective. Inputs with sub-100 ns edges waste the hysteresis benefit, but still work because the device behaves as a fast CMOS inverter at those speeds. When driving long cables, add a 1 kohm series resistor plus 100 pF shunt to ground for a low-pass filter that cleans common-mode noise before it reaches the Schmitt input.
규정 준수 정보
ST Automotive Logic ICs portfolio; RoHS and REACH compliant per ST product listing. Aed-E-Q100 qualified for the M74HC14YRM13TR automotive variant; industrial-grade M74HC14 base part is not separately AEC-Q100 qualified.
