PCA9618UKZ - Single-Channel Fm+ I2C Bus Repeater | NXP
Référence : PCA9618UKZ ✓ ActifPCA9618UKZ Présentation
An I2C bus repeater is an interface IC that regenerates a digital communication signal between a bus controller and a downstream device. Repeaters extend usable bus distance, isolate capacitive loading, improve signal integrity, and allow separate bus segments to operate at compatible logic levels. In the broader semiconductor hierarchy, the PCA9618UKZ is a bus repeater, then an interface IC, then an integrated circuit and semiconductor.
The principal benefit of the PCA9618UKZ is its combination of Fm+ I2C or SMBus compatibility, one-bit architecture, and compact WLCSP-4 footprint. The small package supports placement close to a connector, bus branch, or device interface. Its single-channel format also allows designers to add buffering where required rather than fitting a multi-channel device that would remain unused.
The device is intended for separating clock and data paths when capacitive loading, bus extension, or signal-integrity constraints become important. In a typical implementation, the incoming side connects to the host or bus master, while the output side drives a downstream peripheral. The buffered path reduces the electrical loading seen by the source while maintaining the logic signaling required by I2C-compatible devices.
Typical uses include sensor networks, industrial controllers, consumer equipment, communications modules, and compact embedded systems that use I2C or SMBus. The device is also suitable for generic single-bit level translation or buffering where the system requires regenerated logic rather than a multi-channel fixed-direction translator.
Designers should place the repeater near the branch or load that requires isolation, verify timing margins at the intended bus rate, and account for package parasitics and board-level capacitance. The 4-WLCSP footprint also demands careful PCB layout, stencil and reflow control, and inspection because its ball pitch and dimensions leave little room for rework.
This page consolidates the confirmed function, package information, sourcing details, interface considerations, and drop-in replacement status of the PCA9618UKZ. It also distinguishes verified device facts from electrical parameters that engineers must confirm in the NXP product specification before finalizing a design.
Alternatives de remplacement direct pour PCA9618UKZ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
PCA9618UK
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
PCA9618UKZ Spécifications
| Device Type | Single-channel I2C-bus repeater |
| Supported Bus | Fast-mode Plus I2C-bus or SMBus |
| Number of Channels | 1 channel |
| Buffered Signal | Either SCL or SDA line |
| General-Purpose Use | Single-bit buffering application |
| Process Technology | CMOS |
| Boîtier | 4-WLCSP, 0.83 mm x 0.78 mm |
| Type de montage | Surface mount |
| Moisture Sensitivity Level | MSL 1 |
Guide de configuration des broches du PCA9618UKZ 4-wlcsp, 0.83 mm x 0.78 mm
Configuration des broches du PCA9618UKZ (boîtier 4-wlcsp, 0.83 mm x 0.78 mm). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour PCA9618UKZ.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
PCA9618UKZ convient pour 6 applications: I2C Sensor Hub Buffering, Industrial Controller Bus Segmentation, Communications Module Interface Conditioning, Single-Bit Logic Buffering, Consumer Equipment Bus Extension, Test and Measurement Peripheral Bus.
I2C Sensor Hub Buffering
The PCA9618UKZ can isolate a capacitive sensor branch from the main I2C-bus controller, helping the source maintain cleaner timing when several sensors and long traces increase load. Because the device provides one buffered channel, it may buffer SDA or SCL at a branch point, depending on which path causes the greater timing degradation. Its 4-WLCSP package places the repeater close to the branch and preserves PCB area in compact sensing products. Confirm maximum bus rate, voltage range, and timing margins against the NXP product specification for the installed bus capacitance and operating temperature.
Industrial Controller Bus Segmentation
A PCA9618UKZ is useful when an industrial controller must divide an I2C or SMBus network into independently buffered segments. The regenerated signal reduces the capacitive burden presented by a downstream branch, while the compact 4-WLCSP footprint can be positioned near a connector or terminal block to limit trace exposure. A single channel can buffer either SCL or SDA depending on analysis of the system timing. The final design must verify voltage compatibility, propagation delay, operating temperature, and bus-rate limits in the manufacturer specification.
Communications Module Interface Conditioning
Compact communications modules often combine high-speed digital processing with external sensors and transceivers connected through I2C. The PCA9618UKZ can regenerate one such bus line where loading or routing causes signal-integrity concerns. Its 0.83 mm by 0.78 mm WLCSP-4 package supports placement near the module edge or connector without occupying a large routing area. Since only one channel is available, designers should select SCL or SDA based on the worst measured timing margin and confirm that the buffered path remains compliant with the target bus speed.
Single-Bit Logic Buffering
The PCA9618UKZ can be used outside a complete I2C arrangement as a one-bit buffer when a board needs signal regeneration between two logic domains or circuit blocks. This makes it potentially useful for control, interrupt, or status signals when the electrical conditions satisfy the interface specifications. Its single-channel CMOS implementation supports this generic role without allocating unused channels as a multi-channel device would. Engineers must confirm input thresholds, output levels, propagation delay, supply requirements, and polarity before treating it as a general-purpose logic translator.
Consumer Equipment Bus Extension
In consumer equipment, long I2C routes to displays, sensors, or memory devices can add capacitance and degrade timing. A PCA9618UKZ near the remote branch can regenerate the selected clock or data line and reduce the load visible at the central controller. Its small WLCSP-4 package is valuable in space-constrained appliances and wearable-adjacent accessories. Validate the solution across minimum and maximum supply conditions, temperature extremes, and the worst-case device population because bus timing depends on capacitance and the number of active pull-ups.
Test and Measurement Peripheral Bus
Test and measurement instruments often combine control logic with external fixtures, sensors, and service interfaces on an I2C or SMBus network. The PCA9618UKZ can buffer one line where fixture wiring introduces excessive capacitance or where a short external cable requires regeneration near the connector. Its compact package preserves instrument front-panel space and can be positioned adjacent to the interface connector. The design should verify signal thresholds, timing, supply voltage, and cable behavior with the complete peripheral population, since connector reflections and pull-up strength can dominate repeater performance.
Données de référence d'ingénierie pour PCA9618UKZ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PCA9618UK |
|---|---|---|
| Package | 4-WLCSP (0.83 mm x 0.78 mm) | 4-WLCSP (0.83 mm x 0.78 mm) |
| Brand | NXP Semiconductors | NXP Semiconductors |
| Device Type | Single-channel I2C-bus repeater | Single-channel I2C-bus repeater |
| Number of Channels | 1 channel | 1 channel |
Principaux différenciateurs
- Single-channel architecture supports either clock or data buffering (vs PCA9618UK)
- Very compact WLCSP-4 implementation (vs PCA9618UK)
- Supports general-purpose single-bit buffering (vs PCA9618UK)
Notes de conception
Place the repeater close to the bus branch or device that creates the capacitive load. Keep the unbuffered source-side path short and use the manufacturer land pattern to minimize discontinuity. Before finalizing the placement, measure the worst-case bus rise time and check whether SCL or SDA has the smaller timing margin; only one line can be buffered by this single-channel device.
Use the qualified 4-WLCSP land pattern for the 0.83 mm by 0.78 mm package and control solder-paste volume carefully. Confirm the PCB pad dimensions against the current NXP package drawing rather than scaling a generic WLCSP footprint. Small voids, bridging, or placement skew can cause open circuits that are difficult to detect in a densely routed interface section.
Do not select a replacement solely because it is also a one-channel I2C buffer. The substitute must use the same 4-WLCSP footprint, pin assignment, logic thresholds, propagation behavior, supply range, and timing limits. A dual-channel device also changes the routing and pin count, while a different package requires a board redesign and cannot serve as a drop-in replacement.
Informations de conformité
Compliance status must be confirmed from the current NXP product declaration or material declaration. The MSL 1 designation is confirmed by the product listing.
