SN74LVC2G17DBVR - Dual Schmitt-Trigger Buffer 1.65V-5.5V | TI
Артикул: SN74LVC2G17DBVR ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0.46 | $0,46 |
| 10 | $0.38 | $3,80 |
| 100 | $0.27 | $27,00 |
| 500 | $0.21 | $105,00 |
| 1.000 | $0.18 | $180,00 |
| 3.000 | $0.14 | $420,00 |
SN74LVC2G17DBVR Обзор
A Schmitt-trigger buffer is a type of logic buffer whose input stage uses positive feedback to create two distinct switching thresholds: VT+ for the rising edge and VT- for the falling edge. The hysteresis between these thresholds (typically around 0.5 V at 3 V VCC) rejects input noise and slow edges, making the device well suited for interfacing with mechanical switches, long PCB traces, or any signal that may be distorted by reflections and crosstalk. The SN74LVC2G17 sits in the LVC (Low-Voltage CMOS) logic family - a subcategory of standard logic ICs within the broader semiconductor hierarchy: logic gate -> buffer/driver -> 74-series logic -> integrated circuit.
Key features include 5.5 V tolerant inputs that accept rails higher than VCC, an Ioff partial-power-down mode that disables outputs to prevent back-drive current when the device is unpowered, ±24 mA output drive at 3 V, and 4.4 ns typical propagation delay at 3.3 V. The NanoFree package technology eliminates traditional lead frames, and the SOT-23-6 footprint occupies just 2.9 mm x 1.6 mm of PCB area, enabling high-density designs in portable equipment.
Typical applications include debouncing mechanical switches in consumer and industrial controls, buffering slow or noisy edges in sensor signal chains, single-direction level shifting between 1.8 V, 3.3 V and 5 V domains, fan-out for clock or reset lines, and LED or relay driver interfaces. The wide supply range also allows the part to operate across multiple rails in mixed-voltage systems.
When designing with this device, place decoupling capacitors (0.1 uF ceramic typical) as close to VCC and GND as possible and keep input traces short to preserve noise margin. Because the outputs are push-pull CMOS, no external pull-up resistors are required and the device produces symmetrical rise and fall times into capacitive loads.
This page synthesizes distributor stock and pricing, drop-in alternatives in the same SOT-23-6 footprint, and practical design notes that complement the TI datasheet's typical-application circuits.
Аналоги без доработки для SN74LVC2G17DBVR — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
SN74LVC2G17DBVT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SN74LVC2G17DCKR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SN74LVC2G34DBVR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SN74LVC2G17DCKRG4
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
74LVC2G17GW
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
74LVC2G17W6-7
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SN74LVC2G17DBVR Максимальные параметры и электрические характеристики
| Logic Type | Buffer, Non-Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 1 |
| Тип выхода | Push-Pull |
| Logic Family | 74LVC |
| Supply Voltage (VCC) | 1.65 V to 5.5 V |
| Input Voltage Tolerance | Up to 5.5 V (over-voltage tolerant) |
| Output Drive (IOH/IOL) | 32 mA |
| Quiescent Current (ICC) | 10 uA maximum |
| Рабочая температура | -40 C to +125 C |
| Корпус | SOT-23-6 (DBV) 2.9 mm x 1.6 mm |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes (Pb-free, NanoFree package) |
| Ioff Partial-Power-Down | Yes (back-drive protection) |
Конфигурация выводов SN74LVC2G17DBVR
| Контакт 1 | 1A — Data input for channel 1 (Schmitt-trigger) |
| Контакт 2 | GND — Ground reference |
| Контакт 3 | 2A — Data input for channel 2 (Schmitt-trigger) |
| Контакт 4 | 2Y — Data output for channel 2 (push-pull) |
| Контакт 5 | VCC — Supply voltage (1.65 V to 5.5 V) |
| Контакт 6 | 1Y — Data output for channel 1 (push-pull) |
Типичное применение
SN74LVC2G17DBVR подходит для 6 применениеs: Mechanical Switch Debouncing, Signal Conditioning for Slow or Noisy Edges, Unidirectional Logic Level Translation, Clock or Reset Line Fan-Out Buffer, LED or Relay Driver Interface, IoT and Portable Consumer Electronics.
Mechanical Switch Debouncing
The SN74LVC2G17DBVR's Schmitt-trigger inputs add ~0.5 V of hysteresis at 3 V VCC, suppressing the bounce artifacts produced by mechanical key switches, rotary encoders, and limit-switch contacts. Each channel operates independently, so one device handles two switch inputs in a compact 2.9 mm x 1.6 mm SOT-23-6 footprint. The push-pull 32 mA outputs can directly drive MCU GPIO pins without an external pull-up, simplifying the BOM. Battery-powered remotes, appliance keypads, and white-goods control panels benefit from the part's 10 uA quiescent current, which preserves standby life. The Ioff feature allows the switch lines to be pulled up to a higher rail while VCC is off without back-drive damage. Place a 100 nF ceramic decoupling cap within 5 mm of VCC, route switch traces away from inductive loads, and the inputs will deliver clean, bounce-free edges to the downstream logic.
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Signal Conditioning for Slow or Noisy Edges
Sensor signals from comparators, RC timers, or long PCB traces often arrive with slow slew rates that confuse standard CMOS input stages. The SN74LVC2G17DBVR's Schmitt-trigger action reshapes these slow, noisy edges into clean, fast transitions with symmetrical rise and fall times, freeing the downstream logic of timing ambiguity. With ±32 mA output drive, the device can fan out to multiple loads or drive moderate capacitive loads without violating rise-time budgets. The 1.65 V to 5.5 V supply range lets one part cover 1.8 V, 2.5 V, 3.3 V, and 5 V sensor platforms. Inputs tolerate 5.5 V even when VCC is lower, simplifying mixed-voltage sensor integration. Place the buffer within 25 mm of the source, add a 0.1 uF ceramic bypass near VCC, and the output provides sharp, monotonic edges for ADC sampling or timer capture.
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Unidirectional Logic Level Translation
In mixed-voltage designs the SN74LVC2G17DBVR performs clean unidirectional level shifting between 1.8 V / 2.5 V / 3.3 V / 5 V CMOS domains. Because inputs accept up to 5.5 V regardless of VCC, the device can be powered at the destination voltage and accept higher-voltage logic inputs directly. The TI datasheet confirms this works for one-way translation from any source rail within 0 V to 5.5 V into any destination rail inside 1.65 V to 5.5 V, provided the source signal crosses VT+ at the chosen VCC. Two channels in one SOT-23-6 IC reduce PCB area versus discrete MOSFET translators or dual-supply repeaters. Add a series resistor at the input to limit inrush current during hot-plug events, place VCC decoupling close to the IC, and verify threshold compatibility at the corners of temperature and process.
Рекомендуется
Clock or Reset Line Fan-Out Buffer
Digital systems that need to drive multiple clock loads or reset distribution networks benefit from the SN74LVC2G17DBVR's symmetric push-pull outputs and high drive current. A single channel can fan out one reset source to two microcontrollers or logic domains while maintaining clean edges at frequencies up to the device's propagation-delay limit. The Schmitt-trigger input cleans up a slow or noisy reset line, rejecting glitches shorter than the hysteresis window. Two buffers in one SOT-23-6 let designers handle both clock and reset distribution with one IC. Drive the inputs with a low-impedance source, add a ferrite bead or 33 ohm series resistor if the trace exceeds 50 mm, and follow with a decoupling 0.1 uF capacitor near VCC to maintain signal integrity.
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LED or Relay Driver Interface
The SN74LVC2G17DBVR's 32 mA sink/source capability lets one buffer toggle small indicator LEDs, optocouplers, or relay coils directly without an external driver transistor. The Schmitt-trigger input conditions mechanical or low-voltage control signals into a sharp 0/3.3 V output that activates the load reliably. Two channels fit in a 2.9 mm x 1.6 mm SOT-23-6 footprint, ideal for space-constrained HMI boards. Ioff enables the load to be driven by a back-up rail during power-down sequencing without back-drive damage. Add a flyback diode across inductive loads, limit LED current with a series resistor sized to (VCC - V_F)/I_LED, and respect the absolute maximum output current of 32 mA to keep the part within safe operating area.
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IoT and Portable Consumer Electronics
Battery-powered IoT nodes, wearables, and consumer remotes benefit from the SN74LVC2G17DBVR's 10 uA quiescent current and -40 C to +125 C operating range. The SOT-23-6 NanoFree package is lead-free, halogen-free, and suitable for hand-held and body-contact products, while 5.5 V input tolerance permits direct interface with higher-voltage peripherals. The device debounces user input buttons, conditions sensor edges, and provides output fan-out without adding measurable sleep current to the system. Designers save BOM cost and PCB area by replacing a discrete Schmitt trigger plus comparator with one tiny dual buffer. Sleep-current dominated designs should isolate the part's VCC rail with a load switch or LDO to reach deep standby. Verified designs use 100 nF ceramic decoupling and short traces to the input sources.
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Сводка рекомендуемых товаров
Справочные инженерные данные для SN74LVC2G17DBVR — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SN74LVC2G17DBVT | SN74LVC2G17DCKR | SN74LVC2G34DBVR | SN74LVC2G17DCKRG4 | 74LVC2G17GW | 74LVC2G17W6-7 |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia | Diodes Incorporated |
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SC-70-6 (DCK) - same land area | SOT-23-6 (DBV) - same | SC-70-6 (DCK) - same | SOT-23-6 / SOT-363 - same | SOT-23-6 - same |
| Supply Voltage | 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 | 1.65 V to 5.5 V | 1.65 V to 5.5 V | |
| Output Drive | 32 mA | 32 mA | 32 mA | 24 mA | 32 mA | ||
| Input Type | Schmitt-trigger | Standard CMOS (no Schmitt) | Schmitt-trigger | Schmitt-trigger | |||
| Channels | 2 | 2 | 2 | 2 | 2 | 2 | |
| Ioff Partial-Power-Down | Yes | Yes | Yes | Yes | Yes | ||
| Quiescent Current (max) | 10 uA | 10 uA | 10 uA | 10 uA | |||
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
Ключевые отличия
- Two Schmitt-trigger channels in a NanoFree SOT-23-6 (против SN74LVC2G34DBVR (same package, no Schmitt input))
- Officially sanctioned dual-buffer family with multiple reel/suffix options (против 74LVC2G17GW cross-brand alternative)
- Ioff partial-power-down for back-drive protection (против Discrete MOSFET or RC debounce networks)
Заметки по проектированию
Place a 0.1 uF X7R or X5R ceramic decoupling capacitor within 5 mm of the VCC pin (pin 5) with a short, wide trace to GND (pin 2). Add a 1 uF bulk capacitor on the same rail if multiple LVC devices share VCC, sized using C >= I_step / (dV/dt). Keep input traces short and ground-referenced to minimize loop area and preserve the noise margin the Schmitt-trigger input provides.
Do not apply signals above 5.5 V to the inputs even when VCC is at 1.65 V; the part's input tolerance is generous but not unbounded. Avoid using the SN74LVC2G17DBVR for high-speed clock distribution above 50 MHz - the Schmitt-trigger asymmetry between rising and falling propagation delays creates duty-cycle distortion. For clock fan-out use the SN74LVC2G34DBVR instead. Always leave no-connect pins truly floating unless the datasheet specifies otherwise.
The push-pull CMOS output drives symmetrical rise and fall times into capacitive loads up to ~50 pF; above that, add a 33 ohm series resistor at the output to dampen overshoot. Long output traces (> 50 mm) should be terminated to avoid reflections. The Ioff back-drive protection only works if VCC ramps cleanly to 0 V; if VCC is held at an intermediate voltage while the output is pulled externally, current can flow through the disabled output stage.
Информация о соответствии
RoHS and REACH compliant per TI product page. NanoFree SOT-23-6 package is Pb-free and halogen-free; non-automotive grade - use SN74LVC2G17Q1 (separate catalog entry) for AEC-Q100 requirements.
