PCA9616PW - 3-Channel Differential I2C Bus Buffer | NXP
料号： PCA9616PW ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.63 | $3.63 |
| 10 | $3.31 | $33.10 |
| 100 | $2.94 | $294.00 |
| 500 | $2.68 | $1,340.00 |
| 1,000 | $2.45 | $2,450.00 |
PCA9616PW 概述
A differential I2C-bus buffer, sometimes called a bus repeater or redriver, is an interface IC that belongs to the signal buffer family within the broader hierarchy of interface integrated circuits. Where a plain I2C bus uses open-drain single-ended lines vulnerable to ground bounce and common-mode noise, a dI2C buffer translates the bus into a differential current-mode signaling scheme, dramatically improving common-mode noise immunity while remaining fully compatible with existing Standard-mode, Fast-mode, and Fast-mode Plus I2C and SMBus devices.
Key features of the PCA9616PW include its 3-channel multipoint architecture, which supports a dI2C bus shared by multiple nodes for multipoint topologies; its dual-supply design isolating the single-ended side from the differential side; support for Fast-mode Plus operation at 1 MHz; and integrated hot-swap logic that allows a card or module to be inserted into or removed from a live backplane without corrupting bus transactions. Signal direction is fully automatic, requiring no external direction-control signal.
Technically, the device pairs each single-ended SDA and SCL line with differential transmit/receive pairs on the cable side, using current-mode differential drivers and receivers with high common-mode noise rejection. Because it is a multipoint buffer, several PCA9616 devices can share one differential cable, enabling distributed systems such as rack-mounted cards, industrial backplanes, and remote sensor clusters. NXP documents cable extension of at least 3 m, with longer runs achievable at lower bus speeds.
Typical applications include industrial backplane I2C distribution, telecom and server shelf management, multipoint sensor networks in electrically noisy factory environments, and hot-pluggable module bus extension. The hot-swap logic makes it especially suitable for field-replaceable cards.
Design consideration: plan the differential bus topology to respect multipoint stub-length limits, and verify supply sequencing on both the single-ended and differential rails against the manufacturer datasheet to guarantee correct hot-swap behavior.
This page synthesizes distributor pricing, drop-in replacement analysis, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： PCA9616PW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
PCA9616PW,118
✅ 直接替换✓ 有现货
$2.36 / 个
查看数据手册 →PCA9616PW 规格参数
| Product Type | 3-channel multipoint differential I2C-bus buffer (repeater/redriver) |
| Number of Channels | 3 |
| Maximum Bus Speed | 1 MHz (Fast-mode Plus) |
| Bus Compatibility | SMBus / I2C (Standard, Fast, Fast-mode Plus) to differential I2C (dI2C) |
| Supply Architecture | Dual supply (single-ended side and differential side) |
| Hot-Swap Logic | Yes |
| Signal Direction Control | Automatic, no external control required |
| Multipoint Capability | Yes, multiple buffers can share the dI2C bus |
| Cable Extension | At least 3 m (longer at lower clock speeds) |
| 封装 | 16-pin TSSOP (PW), gull-wing |
| 安装类型 | Surface Mount |
| Temperature Grade | Industrial |
| Terminal Form | Gull wing |
PCA9616PW 16-pin tssop (pw), gull-wing 引脚配置指南
PCA9616PW（16-pin tssop (pw), gull-wing 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： PCA9616PW.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PCA9616PW 适用于 6 应用s: Industrial Backplane I2C Distribution, Hot-Pluggable Module and Card Cage Systems, Multipoint Sensor Clusters in Electrically Noisy Environments, Battery Management and Energy Storage Monitoring, Telecom Shelf and Rack Management, LED Display and Lighting Backplanes.
Industrial Backplane I2C Distribution
Factory automation and industrial control shelves frequently route I2C across backplanes several meters long, where ground potential differences between cards and motor-drive switching noise corrupt single-ended buses. The PCA9616PW converts the single-ended I2C/SMBus on each card into a differential dI2C pair with high common-mode noise rejection, and its 3-channel multipoint architecture lets every card's buffer share one differential cable rather than requiring per-link pairs. Per the NXP datasheet, cable extension of at least 3 m is supported, with longer runs at reduced clock speeds. Automatic direction detection means no firmware or control-line changes are needed when migrating an existing single-ended design to the differential topology, and Standard through Fast-mode Plus (1 MHz) device compatibility preserves existing component choices.
推荐
Hot-Pluggable Module and Card Cage Systems
Telecom, server, and test-instrument card cages require I2C management buses that survive card insertion and removal while the shelf remains powered. The PCA9616PW's integrated hot-swap logic holds its single-ended bus pins off the live bus until local supplies are stable and the bus is idle, preventing partial-power glitch start conditions from corrupting in-flight transactions. Combined with its dI2C differential signaling, a replacement card can be seated into a noisy, powered backplane without disturbing other nodes. The 1 MHz Fast-mode Plus capability ensures management traffic - fan control, voltage monitoring, EEPROM access - completes quickly even with many cards polled. Because direction control is automatic, no card-slot state machine is required, simplifying hardware design of field-replaceable units.
推荐
Multipoint Sensor Clusters in Electrically Noisy Environments
Distributed sensor clusters - motor temperature arrays, battery-pack monitors, proximity sensors near variable-frequency drives - sit in environments where single-ended I2C fails within centimeters of power electronics. The PCA9616PW's differential dI2C signaling provides high common-mode noise immunity, and its multipoint capability allows each sensor node's buffer to tap the same differential cable, minimizing cabling cost. NXP documents at least 3 m of cable at full speed; clusters spreading over greater distances simply clock the bus in Standard or Fast mode, where the datasheet permits longer runs. Each node's single-ended side remains fully compatible with commodity I2C sensors, so the sensor selection is unaffected by the differential transport. Automatic direction handling keeps the shared bus collision-free without host-side intervention.
推荐
Battery Management and Energy Storage Monitoring
Large battery strings place sense and balance electronics across long, high-noise copper runs sharing power electronics with rapid load transients. The PCA9616PW bridges the pack-controller's single-ended I2C management bus to a differential dI2C run that tolerates the ground shifts and switching noise characteristic of inverter-driven systems. Its industrial temperature grade suits enclosure-mounted electronics, and its hot-swap logic protects the shared management bus when module-level BMS boards are serviced live. The 1 MHz Fast-mode Plus rate allows fast polling of many cell-monitoring devices across the multipoint bus, keeping fault detection latency low. Cable extension of at least 3 m per the NXP datasheet covers typical rack heights, and longer runs are achievable at Standard-mode clock rates.
推荐
Telecom Shelf and Rack Management
NEBS-style telecom shelves use I2C/SMBus for shelf-management communication between the shelf controller and line cards, often spanning more than a meter of backplane routed beside high-current power distribution. The PCA9616PW's differential transport rejects the coupled noise, while its multipoint topology lets every line card's buffer share one dI2C pair, matching the shelf-management bus model exactly. Hot-swap logic aligns with operator practice of replacing line cards without powering down the shelf. SMBus compatibility on the single-ended side means existing management agents, EEPROMs, and power-supply controllers connect without protocol conversion. The device's automatic direction control removes the need for the shelf controller to arbitrate buffer enable states, and 1 MHz Fm+ operation shortens the poll cycle across many cards.
推荐
LED Display and Lighting Backplanes
Large LED signage and stage-lighting fixtures distribute I2C control across aluminum frames and long cable looms that run alongside switching LED drivers - a severe common-mode noise environment for single-ended buses. The PCA9616PW extends the controller's I2C bus over the differential dI2C pair with at least 3 m reach per the NXP datasheet, and its multipoint support lets driver boards at several positions share one cable. The single-ended side's compatibility with Standard, Fast, and Fast-mode Plus devices lets designers keep standard PWM LED controllers and expander ICs on each board. Automatic direction detection and hot-swap logic simplify modular fixture designs where display tiles are connected or replaced while the system runs, avoiding dark-bus lockups caused by insertion transients.
推荐
推荐产品汇总
工程参考数据： PCA9616PW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PCA9616PW,118 |
|---|---|---|
| Package | TSSOP-16 (PW) | TSSOP-16 (PW) - same |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Number of Channels | 3 (multipoint) | 3 (multipoint) |
| Maximum Bus Speed | 1 MHz (Fm+) | 1 MHz (Fm+) |
| Hot-Swap Logic | Yes | Yes |
| Multipoint Capability | Yes | Yes |
| Cable Extension | >= 3 m (longer at lower speeds) | >= 3 m (longer at lower speeds) |
| Price (Qty 1) | $3.63 (as of 2026-10-20) | $3.6318 (LCSC, as of 2026-10-20) |
关键差异点
- 3-channel multipoint architecture （对比 PCA9617ADPJ)
- Integrated hot-swap logic on both bus sides （对比 PCA9615 (SOIC-8))
- Automatic direction control （对比 Discrete transceiver-based dI2C designs)
设计说明
Do not attempt to substitute a single-channel dI2C buffer (PCA9615, PCA9617A) onto the PCA9616PW footprint - the packages and pinouts differ completely (SOIC-8/HVSON-10 vs TSSOP-16), and those parts lack the 3-channel multipoint L/H split needed for a shared differential bus. If a redesign toward point-to-point extension is acceptable, budget for PCB layout changes and re-validation of hot-swap behavior. The only true drop-in alternative found in verified data is NXP's own PCA9616PW,118 packaging variant.
Keep multipoint stubs on the differential dI2C cable short relative to the bus clock edge rate, especially when running at the 1 MHz Fast-mode Plus rate. Place the PCA9616PW close to the cable connector on each card, and route the single-ended SDA/SCL traces as short as possible to the local bus devices. Follow the TSSOP-16 land pattern in the NXP PCA9616 datasheet (Rev. 2) and verify both supply rails decouple at the part with local ceramics.
The PCA9616 is a dual-supply device: confirm both the single-ended side and the differential side supply rails are within the datasheet ranges before enabling, and respect the power-up sequencing guidance in the manufacturer datasheet so the hot-swap logic releases the bus only after both rails are stable. On hot-pluggable cards, add local bulk capacitance to absorb connector inrush so the insertion event does not sag the shared rail and trip the hot-swap circuit of neighboring nodes.
合规信息
Compliance details were not explicitly stated in the retrieved web data; consult the NXP product page (https://www.nxp.com/part/PCA9616PW) for current RoHS/REACH status. The ,118 suffix in the packaging code conventionally indicates lead-free/RoHS packing at NXP, but this was not verified in the provided data.
