P82B96DP,118 - Dual I2C Bus Buffer 400kHz TSSOP-8 | NXP
Référence : P82B96DP,118 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.15 | $2,15 |
| 10 | $1.93 | $19,30 |
| 100 | $1.68 | $168,00 |
| 500 | $1.41 | $705,00 |
| 1 000 | $1.24 | $1 240,00 |
P82B96DP,118 Présentation
A bidirectional bus buffer, also called an I2C buffer or bus extender, sits between an I2C or SMBus controller and its remote peripherals to isolate capacitance, extend cable reach, and translate voltage levels. Within the interface IC hierarchy (bus buffer -> interface IC -> communication IC -> semiconductor), buffers like the P82B96 are essential whenever total bus capacitance exceeds the standard 400 pF limit of the I2C-bus specification (UM10204).
Key features include two independent buffer channels, non-latching bidirectional signal transfer that preserves the wired-AND I2C arbitration scheme, and support for buffer outputs at higher voltage and current levels than standard I2C logic. Because the device is bipolar, its Tx/Rx and Ty/Ry pins use standard I2C logic levels while the Sx/Sy side can drive buses at different voltage and current levels, including long cables.
Technically, the P82B96 splits each bidirectional line into an input (Tx/Ty), an open-drain buffer output (Rx/Ry), and a Schmitt-type connection (Sx/Sy) that can interface to other bus configurations or a second P82B96 for cascaded level translation. This architecture enables 40 m cable lengths at 400 kHz per NXP product data, far beyond native I2C limits.
Typical applications include I2C bus extension over cables in industrial automation and process control, level translation between 3.3 V, 5 V and 12-15 V bus segments, and splitting a single master bus into isolated zones in sensing and instrumentation systems.
A key design consideration: each buffer stage adds a small propagation delay and output low voltage offset, so pull-up resistor values on the buffered side should be recalculated to maintain noise margins.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour P82B96DP,118 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec P82B96DP,118 (même facteur de forme et même empreinte) — différant par Function, Number of Channels.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PCA9600DP,118
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
P82B96DP,118 Spécifications
| Fonction | Dual bidirectional bus buffer / ReDriver |
| Number of Channels | 2 |
| Maximum Data Rate | 400 kHz |
| Buffered Bus Voltage Range | 2 V to 15 V |
| Signal Direction | Bidirectional, non-latching |
| Interface Standard | I2C-bus, SMBus compatible |
| Logic Levels (Tx/Rx, Ty/Ry) | Standard I2C-bus logic voltage levels |
| Technology | Bipolar IC |
| Maximum Cable Length | 40 m at 400 kHz (per NXP product page) |
| Boîtier | TSSOP-8 (DP) |
| Type de montage | Surface Mount |
| Packaging Suffix | ,118 (SOT402-1 tape and reel, standard) |
| Statut RoHS | Compliant |
| Statut du cycle de vie | Active |
Configuration des broches de P82B96DP,118
| Broche 1 | Tx — Channel x input from I2C-bus master logic (Tx/Rx pair) |
| Broche 2 | GND — Ground |
| Broche 3 | Sx — Channel x buffered bus side - connects to alternative bus configuration voltage levels |
| Broche 4 | Sy — Channel y buffered bus side - connects to alternative bus configuration voltage levels |
| Broche 5 | Zx — Channel x auxiliary connection (Sx-bypass/output pin per datasheet functional description) |
| Broche 6 | VCC — Supply voltage |
| Broche 7 | Rx — Channel x open-drain buffer output toward Sx-side bus (Tx/Rx pair) |
| Broche 8 | Ty — Channel y input/output using standard I2C-bus logic voltage levels (Ty/Ry pair) |
Applications typiques
P82B96DP,118 convient pour 6 applications: Industrial Automation & Process Control, Sensing & Instrumentation, Portable Devices, I2C Bus Extension over Long Cables, Multi-Voltage Bus Segregation, LCD and Peripheral Panel Interfaces.
Industrial Automation & Process Control
In factory automation and process control systems, I2C sensors and actuators are frequently mounted meters away from the PLC or controller cabinet, so total bus capacitance far exceeds the standard I2C limit. The P82B96DP,118 isolates capacitance between the controller side and the remote cable side, and its bipolar buffer drive allows the bus to operate up to 15 V with higher noise margins, supporting cable runs up to 40 m at 400 kHz per NXP data. Placed at both ends of the cable, two P82B96 channels buffer SDA and SCL while preserving wired-AND arbitration and clock stretching. The non-latching bidirectional transfer ensures multi-master systems keep working without software changes.
Recommandé
Sensing & Instrumentation
Data acquisition and instrumentation systems often combine 3.3 V digital controllers with 5 V or higher-voltage analog boards on the same I2C bus. The P82B96DP,118's split topology - standard I2C logic levels on the Tx/Rx side and configurable levels on the Sx/Sy side - lets each voltage domain keep its own pull-up resistors while the buffer passes bidirectional signals non-latching at up to 400 kHz. This is particularly useful for connecting 12-15 V industrial sensor modules to 3.3 V MCUs without additional transistor level-shift circuits, and the two independent channels buffer both SDA and SCL in a single TSSOP-8 device, saving board area and BOM cost.
Recommandé
Portable Devices
Portable and battery-powered equipment with multiple I2C peripherals (touch controllers, fuel gauges, sensors) can exceed the 400 pF bus capacitance budget as boards grow and connectors are added. A P82B96DP,118 placed between the MCU and peripheral clusters splits the bus into short segments, each well within capacitance limits, while adding negligible standby current. The TSSOP-8 package occupies only about 9 mm2 of board area, and the bipolar architecture operates reliably across the consumer supply rails of the system. Because the buffer is non-latching, hot-plugging a peripheral onto one segment does not disturb the other, which matters for docking and accessory connectors in portable designs.
Recommandé
I2C Bus Extension over Long Cables
The P82B96's headline use case is extending I2C beyond its native reach: NXP specifies operation over cable lengths up to 40 m at 400 kHz. One buffer channel carries SDA and the other SCL. The controller-side segment uses standard I2C pull-ups, while the cable side can use a higher bus voltage (up to 15 V) and stronger pull-down drive, directly increasing noise immunity in electrically noisy environments such as motor drives and HVAC installations. Designers should size cable-side pull-up resistors against total cable capacitance to keep the rise time within the I2C specification, and use shielded cable for best margins.
Recommandé
Multi-Voltage Bus Segregation
Systems that mix 1.8 V, 3.3 V, 5 V and 12 V bus domains can cascade P82B96 buffers, since its Tx/Rx pins present standard I2C logic levels that connect directly to a second P82B96. Each stage references its Sx/Sy side to a different supply through pull-up resistors, building a clean three- or four-level bridge without pass-transistor level shifters and their threshold-voltage trade-offs. The open-drain, non-latching architecture keeps arbitration and clock stretching functional across every domain, so multi-master topologies spanning voltage levels work transparently. This approach is common in mixed-voltage baseband, power-management, and automotive body-electronics architectures.
Recommandé
LCD and Peripheral Panel Interfaces
Display and peripheral panels connected by cable to a main board present both capacitance and connector reliability issues for I2C control buses. Buffering the SDA and SCL lines with a P82B96DP,118 at the board edge isolates the cable from the core bus and lets the panel-side segment run at a higher voltage for better noise immunity across connector contacts. At 400 kHz operation, backlight controllers, touch sensors, and EDID-style EEPROMs on the panel respond with no protocol changes. The dual channels in one TSSOP-8 fit naturally beside the edge connector, and the bipolar buffer tolerates the transient conditions of cable hot-insertion better than bare I2C ports.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour P82B96DP,118 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PCA9600DP,118 |
|---|---|---|
| Package | TSSOP-8 (DP) | TSSOP-8 (DP) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same |
| Number of Channels | 2 | 2 |
| Maximum Data Rate | 400 kHz | 400 kHz |
| Bus Voltage Range | 2 V to 15 V | wider extended range per PCA9600 datasheet |
| Drive Capability on Buffered Side | Standard bipolar buffer drive | Higher drive capability |
| Maximum Cable Length | 40 m at 400 kHz | 40 m at 400 kHz |
Principaux différenciateurs
- Bipolar robustness and level flexibility (vs PCA9306DCTR)
- Two independent channels in TSSOP-8 (vs PCA9600DP,118)
- Cascadable standard-logic interface (vs TCA9517DR)
Notes de conception
Estimating: do not assume the standard 400 pF I2C capacitance limit applies across the whole extended system - each P82B96 stage divides the bus into two independent capacitance zones, which is the entire point of the device. On the buffered (Sx/Sy) side, recalculate pull-up resistors against cable capacitance per meter: with 100 pF/m cable and 400 kHz operation, total rise time must stay within the I2C spec, so pull-ups may need to be significantly lower in value than on the controller side. Also note the buffer adds an output-low offset voltage on each side; budget it in your logic-level noise margin calculations before finalizing pull-up values.
Place the P82B96DP,118 close to the cable or bus-zone entry point so the unbuffered controller-side traces remain short and within normal I2C capacitance. Provide a 100 nF ceramic decoupling capacitor directly across VCC and GND pins (pins 6 and 2), with a solid ground connection. Route the Sx/Sy buffered traces away from switching-regulator nodes and motor drive lines; the device is intended to improve noise margins on long runs, but radiated pickup on the cable side still degrades margins. Keep the TSSOP-8 thermal and ground return path uninterrupted on the PCB layer beneath the part.
Verify the VCC of the P82B96DP,118 against the supply domain of the Tx/Rx-side logic, since the Tx/Rx and Ty/Ry pins use standard I2C-bus logic levels referenced to the device supply (per the NXP datasheet). The Sx/Sy-side bus can run at a different, higher voltage (up to 15 V) using its own pull-up resistors - this voltage is supplied by the remote bus, not by the buffer's VCC. Confirm the exact operating supply range and quiescent current figures in the official NXP P82B96 datasheet before finalizing the power budget for battery-powered designs.
Informations de conformité
RoHS compliance and lead-free status indicated by the ,118 suffix per NXP ordering convention and NXP product page environmental quality section. REACH, halogen-free, and conflict minerals declarations should be confirmed on the NXP environmental compliance portal.
