PCA9601D,118 - I2C Bus Buffer 1MHz SO-8 | NXP
Артикул: PCA9601D,118 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $1.62 | $1,62 |
| 10 | $1.46 | $14,60 |
| 100 | $1.21 | $121,00 |
| 500 | $1.02 | $510,00 |
| 1.000 | $0.86 | $860,00 |
PCA9601D,118 Обзор
An I2C-bus buffer (also called a bus repeater, redriver, or line driver) is a signal-buffer IC placed between an I2C master and remote slave devices. Within the power management and interface IC hierarchy, it sits alongside level translators and line repeaters as signal conditioners: it splits one heavily loaded bus segment into isolated segments, so each segment's capacitance stays within the I2C specification while allowing many more target devices on remote daughter cards.
Key features include 4000 pF bus-capacitance isolation, a significant improvement over the standard 400 pF I2C limit; support for both standard-mode (100 kHz) and Fast-mode Plus (1 MHz) operation, making it a higher-speed version of the P82B96 and a higher-drive version of the PCA9600; and a wide 2.5 V to 15 V supply range that supports 3.3 V, 5 V, 9 V, and 12 V systems. Open-drain bidirectional I/O preserves the wired-AND I2C protocol, and the TX/RX and TY/RY pins use standard I2C logic levels.
Architecturally, the PCA9601 separates each buffer direction into independent L-side (logic) and S-side (buffered bus) stages. The SX/SY side is compatible with normal I2C logic levels of masters and slaves, or with TX/RX signals of a second PCA9601 or P82B96, enabling cascaded multipoint topologies. Current amplification on the buffered side allows strong pull-down capability to charge and discharge very large bus capacitances.
Typical applications include long-distance I2C cabling in industrial automation, buffered I2C expansion to remote daughter cards and sensor modules, and multipoint Fm+ buses in telecom and server backplanes.
Design consideration: each buffer stage adds a small propagation delay, so total bus timing margins should be verified at 1 MHz Fm+ operation; also size pull-up resistors on both sides independently, since the buffer isolates the bus segments.
This page synthesizes distributor pricing, drop-in alternatives, pinout details, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для PCA9601D,118 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с PCA9601D,118 (тот же форм-фактор и посадочное место) — отличается по Function, Number of Channels, Operating Temperature, Package, RoHS Status.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
PCA9600D,118
✅ Прямая замена✓ В наличии
$1.02 / шт.
Открыть даташит →P82B96D,118
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PCA9601D,112
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
PCA9601D,118 Характеристики
| Функция | Dual bidirectional I2C-bus buffer / redriver |
| Number of Channels | 1 channel buffer (2 bidirectional paths) |
| Maximum Data Rate | 1 MHz (Fast-mode Plus) |
| Propagation Delay | 50 ns |
| Supply Voltage Range | 2.5 V to 15 V |
| Output Current | 15 mA |
| Max Bus Capacitance Supported | 4000 pF |
| I/O Type | Bidirectional open-drain |
| Compatible Standards | I2C Standard-mode (100 kHz) and Fast-mode Plus (1 MHz) |
| Рабочая температура | -40C to +85C |
| Корпус | SO-8 (SOIC-8) |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant (ROHS per distributor data) |
| Supply Compatibility | 3.3 V / 5 V / 9 V / 12 V systems |
| Family | Higher-speed version of P82B96; higher-drive version of PCA9600 |
Конфигурация выводов PCA9601D,118
| Контакт 1 | GND — Ground reference |
| Контакт 2 | L1 — Logic-side (L) I/O for channel 1 (SCL path), standard I2C logic levels |
| Контакт 3 | L0 — Logic-side (L) I/O for channel 0 (SDA path), standard I2C logic levels |
| Контакт 4 | VCC — Supply voltage, 2.5 V to 15 V |
| Контакт 5 | SCL — Buffered bus-side clock I/O (SX/SY side) |
| Контакт 6 | SDA — Buffered bus-side data I/O (SX/SY side) |
| Контакт 7 | R1 — Buffered/remote-side I/O for channel 1 (clock path) |
| Контакт 8 | R0 — Buffered/remote-side I/O for channel 0 (data path) |
Типичное применение
PCA9601D,118 подходит для 6 применениеs: Long-Distance I2C Bus Extension, Multipoint Fm+ Bus on Remote Daughter Cards, Industrial Automation Control Buses, Level Shifting Between 3.3V/5V and 12V I2C Domains, Telecom and Server Backplane Management, Buffered I2C Sensor Clusters in Instrumentation.
Long-Distance I2C Bus Extension
The PCA9601D,118's headline capability is driving I2C buses up to 4000 pF - ten times the 400 pF standard-bus limit - making it the natural choice for I2C cabling that spans meters rather than centimeters, such as cable runs between a controller and a remote enclosure. The buffer isolates the remote segment capacitance from the master, so timing is preserved even with long harnesses. Because its supply range reaches 15 V, the remote segment can be pulled up to 9 V or 12 V for superior noise immunity on long, unshielded cable. Place the buffer near the master, add local 100 nF decoupling, and size the remote pull-ups for the target rise time per the NXP application equations.
Рекомендуется
Multipoint Fm+ Bus on Remote Daughter Cards
NXP positions the PCA9601 specifically to 'allow many more Fast-mode Plus (Fm+) targets on remote daughter cards'. In backplane or card-cage systems, each daughter card adds capacitance that quickly exceeds the 400 pF I2C budget. One PCA9601D,118 per card segments the bus so the master side sees only the buffer's small pin capacitance, while each card's local bus operates at 1 MHz Fm+ with its own optimized pull-ups. The SX/SY side is compatible with TX/RX of a second PCA9601 or P82B96, enabling tree topologies. Designers should budget the 50 ns propagation delay per buffer stage when computing total bus timing at 1 MHz.
Рекомендуется
Industrial Automation Control Buses
In factory automation, I2C frequently connects sensor clusters, EEPROMs, and I/O expanders across machinery where 24 V noise transients and cable capacitance threaten marginal standard I2C operation. The PCA9601D,118 solves both problems: the 2.5 V to 15 V supply supports a robust higher-voltage buffered segment, and 4000 pF capacitance handling covers long motor-cabinet cable runs. Its open-drain bidirectional architecture preserves I2C clock stretching and multi-master arbitration without protocol translation. Typical companions include I/O expanders and temperature sensors on the buffered side. Verify that the buffered segment pull-up strength can sink 15 mA per channel during fast fall edges.
Рекомендуется
Level Shifting Between 3.3V/5V and 12V I2C Domains
Because the PCA9601D,118's supply can be set from 2.5 V up to 15 V while its logic-side pins use standard I2C levels, one SO-8 device both buffers and shifts an I2C bus between, for example, a 3.3 V microcontroller and a 12 V battery-management or LED-driver bus. This eliminates a separate level translator stage in designs where a 12 V-tolerant bus improves noise margin. Each channel is bidirectional and open-drain, so no direction-control signal is needed. Note that the logic-side HIGH level is referenced to the logic-side pull-up supply, so pull the L-side to the master's VDD and the buffered side to the 12 V rail.
Рекомендуется
Telecom and Server Backplane Management
Shelf-management and power-supply monitoring in telecom racks relies on I2C buses that traverse backplanes collecting dozens of device capacitances. The PCA9601D,118 segments these buses at card edges so each shelf's capacitance stays isolated, while 1 MHz Fast-mode Plus operation shortens polling time for large device populations - important when a shelf manager scans many power supplies and fan controllers. Its 0C to 85C application focus per NXP matches controlled telecom environments. Cascading PCA9601 devices across shelves is supported since the buffer I/O levels are protocol-standard on both protocol-facing pins.
Рекомендуется
Buffered I2C Sensor Clusters in Instrumentation
Test and measurement instruments concentrate many I2C sensors - pressure, humidity, temperature - on crowded boards where trace capacitance plus sensor input capacitance approaches the bus limit. Inserting a PCA9601D,118 between the controller and a dense sensor cluster restores full timing margin without redesigning the sensor wiring. The 50 ns propagation delay is negligible at 100 kHz standard mode, and the device's low channel count keeps BOM impact minimal. The 15 mA sink capability ensures sharp falling edges even with the reduced pull-up resistance needed for a high-capacitance segment. Keep decoupling capacitors within 5 mm of the VCC pin.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для PCA9601D,118 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | PCA9600D,118 | P82B96D,118 | PCA9601D,112 |
|---|---|---|---|---|
| Package | SO-8 (SOIC-8) | SO-8 - same | SO-8 - same | SO-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Supply Voltage | 2.5 V to 15 V | 2.5 V to 12 V | 3 V to 12 V | 2.5 V to 15 V |
| Max Bus Capacitance | 4000 pF | 4000 pF | 4000 pF (approx. per family design) | 4000 pF |
| Drive Strength | Higher drive (15 mA listed) - highest in family | Standard drive | Standard drive (30 mA sink per port) | Same as PCA9601D,118 |
| Positioning | Higher-speed version of P82B96; higher-drive version of PCA9600 | Predecessor of PCA9601 | Legacy general-purpose I2C buffer | Same die, packaging variant |
| Operating Temperature | -40C to +85C (distributor data) | -40C to +85C | -40C to +85C | -40C to +85C |
| RoHS | Compliant | Compliant | Compliant | Compliant |
Ключевые отличия
- Fast-mode Plus speed in a legacy SO-8 buffer footprint (против P82B96D,118)
- Wider supply range up to 15 V (против PCA9600D,118)
- Highest drive capability in the NXP buffer family (против PCA9600D,118)
Заметки по проектированию
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 4), with an additional 4.7 uF bulk capacitor nearby if the buffered segment is long. Because the buffer's two sides carry independent pull-ups to potentially different rails, route the L-side traces away from the buffered-side traces to reduce coupling, and keep the SO-8 ground return path short. For multipoint daughter-card use, put the PCA9601 at the card connector edge so the isolated segment begins immediately at the card boundary.
The 2.5 V to 15 V supply range lets you power the buffered bus at 9 V or 12 V for noise immunity on long cables, while the L-side communicates at standard I2C logic levels. Estimated: at 15 mA drive per channel and 12 V, worst-case buffer dissipation stays well under 0.2 W, so the SO-8 package needs no heatsink; still, avoid sizing pull-ups below the current-limit guidance in the NXP datasheet to keep sink currents within ratings during simultaneous clock and data fall edges.
Each PCA9601 stage adds approximately 50 ns of propagation delay. Estimated: at 1 MHz Fast-mode Plus (period 1 us), three cascaded buffers consume about 150 ns - roughly 15 percent of the clock period - so limit cascading depth and recalculate bus timing (tHIGH, tLOW, rise times) for the full chain. Pull-up resistors must be computed independently per segment: a 4000 pF segment at Fm+ requires very strong pull-ups or active pull-up assistance; consider running long segments at 400 kHz or 100 kHz instead.
Do not substitute the lower-speed P82B96D,118 or PCA9600D,118 into a PCA9601 socket if the bus runs Fast-mode Plus (1 MHz) - they are pin-compatible but lose Fm+ timing margin. Also note NXP's product page references a 0C to 85C application focus while distributor data lists -40C to +85C; confirm the temperature grade on your specific order code and lot. Finally, the SX/SY side is intended only for standard I2C logic levels or second-buffer TX/RX signals - never connect it to a high-voltage rail.
Информация о соответствии
Distributor listings (JLCPCB) mark the part ROHS; the NXP ,118 suffix denotes the standard lead-free/halogen-free SMD order code. Formal REACH and conflict-minerals declarations should be obtained from the NXP product page.
