SN74LVC2G17 - Dual Schmitt-Trigger Buffer 5.5V | Texas Instruments
MPN： SN74LVC2G17 ✓ 啟用中SN74LVC2G17 概覽
A Schmitt-trigger buffer is a digital logic gate that uses positive feedback to create different input thresholds for rising (VT+) and falling (VT-) signals. This hysteresis eliminates false triggering from noise or slow input edges, making Schmitt buffers essential for conditioning noisy signals, debouncing mechanical switches, and squaring up slow-rise-time waveforms. The SN74LVC2G17 belongs to the LVC logic family, part of the broader low-voltage CMOS buffer and line-driver category in the logic IC hierarchy.
Key features include a wide supply range of 1.65 V to 5.5 V, 5.5-V input tolerance for mixed-voltage interfacing, and a maximum propagation delay (tpd) of 3.3 ns at 3.3 V. Output drive is ±24 mA at 3.3 V with a push-pull stage providing rail-to-rail output swing. Maximum ICC is 10 uA, enabling low-power designs, and the Ioff feature fully supports partial-power-down operation by preventing damaging backflow current when VCC is removed.
Architecturally, the device uses a CMOS process with comparator-based Schmitt input circuits that guarantee stable switching even with very slow input transitions. Typical VOLP (output ground bounce) and VOHV (output VOH undershoot) are specified at 25C to characterize system-level signal integrity. Both an automotive SN74LVC2G17-Q1 (AEC-Q100 qualified) variant and the enhanced SN74LVC2G17-EP for demanding applications are available.
Typical applications include switch debouncing, sensor signal conditioning, level shifting between 3.3-V and 5-V logic domains, and buffering of slow or noisy signals in industrial, consumer, and automotive electronics.
Design tip: leverage the hysteresis characteristics for your noise environment and observe proper power sequencing - Ioff supports partial power-down, but unintended current paths should still be avoided.
直接替換替代品，適用於 SN74LVC2G17 — 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。
SN74LVC2G17-Q1
✅ 直接替換📋 參考替代品（不在目錄中）
SN74LVC2G17-EP
✅ 直接替換📋 參考替代品（不在目錄中）
74LVC2G17
✅ 直接替換📋 參考替代品（不在目錄中）
74LVC2G17GV
✅ 直接替換📋 參考替代品（不在目錄中）
74LVC2G17
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
SN74AUP2G17
⚡ 相同封裝📋 參考替代品（不在目錄中）
SN74LVC2G17 最大額定值與電氣特性
| Logic Function | Dual Schmitt-Trigger Buffer (Y = A) |
| Number of Channels | 2 |
| Bits per Element | 1 |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Input Voltage Tolerance | 5.5 V max |
| Max Propagation Delay (tpd) | 3.3 ns at 3.3 V |
| Output Drive | ±24 mA at 3.3 V |
| 輸出類型 | Push-Pull, Non-Inverting |
| Quiescent Current (ICC) | 10 uA max |
| Partial Power Down (Ioff) | Yes |
| Typical VOLP (Ground Bounce) | 0.8 V max at VCC = 3.3 V, 25C |
| 工作溫度 | -40C to +125C |
| 封裝 | SOT-23-6 (DBV), SON-6 (DRY), NanoStar (YEP) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Input Hysteresis | Schmitt-trigger (VT+ / VT- differential) |
SN74LVC2G17 腳位配置
| 腳位 1 | 1A — Data input, channel 1 (Schmitt-trigger) |
| 腳位 2 | GND — Ground |
| 腳位 3 | 2A — Data input, channel 2 (Schmitt-trigger) |
| 腳位 4 | 2Y — Data output, channel 2 (push-pull) |
| 腳位 5 | VCC — Power supply, 1.65 V to 5.5 V |
| 腳位 6 | 1Y — Data output, channel 1 (push-pull) |
典型應用
SN74LVC2G17 適用於 6 應用s: Switch Debouncing, Level Shifting 3.3V to 5V Logic, Slow Signal Conditioning for MCUs, Industrial Noise-Immune Signaling, Automotive ECU Digital Interfaces, Portable and Battery-Powered Devices.
Switch Debouncing
Mechanical switch contacts bounce for milliseconds after closure, producing multiple logic edges. The SN74LVC2G17's Schmitt-trigger input hysteresis (distinct VT+ and VT- thresholds) converts these noisy transitions into single clean edges. Paired with an RC filter (e.g., 10k + 100nF) at the input, the buffer squares up the slow exponential waveform with guaranteed stability over the full 1.65-V to 5.5-V supply range and ±24-mA output drive for downstream logic.
推薦
Level Shifting 3.3V to 5V Logic
In mixed 3.3-V/5-V systems, the SN74LVC2G17 accepts 5.5-V-max inputs regardless of VCC, so a 3.3-V-driven input can drive a 5-V-supplied buffer output. Because it is a buffer, the output swings rail-to-rail to the higher domain, meeting 5-V CMOS VIH levels (~70% of VCC). The Ioff feature lets 5-V rails stay live during 3.3-V partial power-down without backflow damage - critical for sequenced multi-rail boards.
推薦
Slow Signal Conditioning for MCUs
Sensor outputs with slow rise times (photodiode transimpedance nodes, RC-filtered comparators, long cables) can oscillate ordinary CMOS inputs. The SN74LVC2G17's comparator-based Schmitt input guarantees a single output transition even for near-DC input ramps. With 3.3-ns max tpd at 3.3 V, timing penalty is negligible, and the push-pull output directly drives MCU GPIO or timer capture inputs without external pull resistors.
推薦
Industrial Noise-Immune Signaling
Factory environments couple motor-switching transients onto signal lines. The SN74LVC2G17's hysteresis provides tens of millivolts of noise immunity at the threshold region, and its ±24-mA output re-drives signals degraded by cable capacitance. Operating from -40C to +125C and available as the SN74LVC2G17-Q1 (AEC-Q100) or -EP enhanced variant, it covers harsh-environment industrial control and instrumentation requirements.
推薦
Automotive ECU Digital Interfaces
The AEC-Q100-qualified SN74LVC2G17-Q1 conditions sensor and switch inputs in 12-V automotive systems, translating through resistor dividers to the 1.65-V to 5.5-V logic domain. Its 5.5-V input tolerance handles load-dump-clamped signals, hysteresis rejects wiring-harness noise, and Ioff supports the partial power-down states typical in CAN/LIN node sleep architectures used across body, powertrain, and chassis ECUs.
推薦
Portable and Battery-Powered Devices
With 10-uA maximum ICC and operation down to 1.65 V, the SN74LVC2G17 fits single-cell Li-ion and 2x-AA portable products where every microamp matters. The tiny SOT-23-6 (DBV) and sub-2mm2 SON-6 (DRY) packages conserve PCB area. It debounces power buttons, buffers wake-up signals to PMIC enable pins, and squares up charger-detect waveforms while drawing negligible static load from the battery.
推薦
推薦產品摘要
工程參考資料，適用於 SN74LVC2G17 — 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 | SN74LVC2G17-Q1 | SN74LVC2G17-EP | 74LVC2G17GV | SN74AUP2G17 |
|---|---|---|---|---|---|
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 - same | SOT-23-6 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia | Texas Instruments |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 0.8 V to 3.6 V |
| Output Drive | ±24 mA at 3.3 V | ±24 mA at 3.3 V | ±24 mA at 3.3 V | ±24 mA at 3.0 V | ±4 mA at 3.0 V |
| Qualification | Standard (commercial/industrial) | AEC-Q100 automotive | Enhanced product | Standard | Standard |
| Partial Power Down (Ioff) | Yes | Yes | Yes | Yes (IOFF) | Yes |
主要差異化特點
- Wide 1.65-V to 5.5-V supply with 5.5-V input tolerance (對比SN74AUP2G17)
- Automotive drop-in variant (對比74LVC2G17GV)
- Ioff partial-power-down support (對比SN74LVC2G17-EP)
設計說明
Do not exceed 5.5 V on inputs even though VCC tolerance is 5.5 V - input clamp behavior above this absolute maximum damages the Schmitt input stage. When translating from 24-V industrial signals, always use a resistor divider before the buffer input. Verify VT+/VT- hysteresis at your actual VCC from the datasheet table, since thresholds scale with supply and 1.8-V operation leaves less noise margin than 5-V operation.
Place a 100-nF ceramic decoupling capacitor within 2 mm of the VCC pin. For push-pull outputs driving cables or high-fanout loads, add bulk capacitance (1-uF) nearby to supply the ±24-mA transient current and reduce VOLP ground bounce. Keep the GND return path short; the DRY (SON-6) package has minimal lead inductance for the lowest bounce in high-speed clock buffering.
The Ioff circuit enables partial power-down but does not protect against back-powering through the input above 5.5 V. In multi-rail systems, sequence VCC before applying input signals above ground-referenced limits, or rely on the 5.5-V input tolerance with rails present. With 10-uA max ICC, static battery drain is negligible, but dynamic ICC scales with input frequency - estimate total using the datasheet dynamic power equation for MHz clock buffering.
Use the Schmitt hysteresis intentionally: for a 3.3-V rail, the threshold gap provides defined immunity to ripple riding on threshold-level signals. For very slow edges (>1 ms), confirm input leakage effects on the divider impedance driving 1A/2A. Outputs are not 5-V tolerant above VCC - do not use this part to interface a 5-V output into a 3.3-V-supplied buffer; instead power VCC at 5 V or select a dual-supply translator.
合規資訊
RoHS compliant per TI product page. AEC-Q100 qualification applies to the SN74LVC2G17-Q1 variant only. REACH/halogen-free status not stated in provided data.
