P82B96TD/S410,118 - Dual I2C Bus Buffer 400kHz | NXP
MPN: P82B96TD-S410118 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.05 | $1.05 |
| 10 | $0.94 | $9.40 |
| 100 | $0.78 | $78.00 |
| 500 | $0.65 | $325.00 |
| 1,000 | $0.52 | $520.00 |
P82B96TD-S410118 Overview
A bus buffer (also called an I2C repeater, level shifter, or bus extender) is an interface IC that isolates and strengthens signal lines in a serial communication system. In the hierarchy of I2C system components, it sits between the I2C master/slave devices and the physical bus, solving problems such as bus capacitance limits, mixed-voltage domains, and long cable runs that a plain two-wire I2C-bus cannot tolerate. The P82B96 belongs to the broader family of interface ICs - signal buffers, repeaters, and redrivers.
Key features of the P82B96 include two independent buffer channels that handle both SCL and SDA I2C signals, bidirectional data transfer without latching, and a unique split of each I2C signal into forward and reverse (Tx/Ty and Rx/Ry) signal paths. According to NXP product information, it can interface I2C-bus logic signals to 350 uA SMBus systems, to 3.3 V logic devices, and to 15 V levels and/or low-impedance lines. The bipolar (bipolar transistor) process technology gives it robust drive strength and wide supply tolerance compared with typical CMOS buffers.
Technically, each channel presents three ports: a logic-level side for standard I2C systems, and two additional ports that allow level translation between different voltage domains and drive of low-impedance or heavily loaded lines. Because the device is non-latching, it does not suffer from the lock-up issues common to some I2C repeater designs during arbitration or clock stretching.
Typical applications include I2C bus extension over long cables (up to 40 m), mixed-voltage interfacing between 3.3 V and 15 V bus segments, SMBus systems, and driving multiple heavily loaded I2C branches in industrial and automotive bodies-electronics environments.
A key design consideration: because the buffer passes drive current, the pull-up resistor values on each bus segment must be calculated independently for each side of the buffer rather than for the whole bus.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for P82B96TD-S410118 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with P82B96TD-S410118 (same form factor and footprint) — differing in Function, Latching Behavior, Number of Channels, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
P82B96D
✅ Drop-In📋 Reference alternative (not in catalog)
P82B96DR
✅ Drop-In📋 Reference alternative (not in catalog)
PCA9600D,118
✅ Drop-In✓ In Stock
$1.02 / Unit
View Datasheet →P82B96TD-S410118 Specifications
| Function | Dual bidirectional bus buffer (I2C/SMBus) |
| Number of Channels | 2 |
| Data Rate | 400 kHz |
| Supply Voltage Range | 3 V to 12.5 V (per NXP product information) |
| Bus Voltage Levels Supported | 3.3 V logic to 15 V bus levels |
| SMBus Compatibility | Yes (350 uA SMBus) |
| Max Bus Length | 40 m (per NXP product page) |
| Latching Behavior | Non-latching, bidirectional |
| Signal Paths | Forward/reverse Tx, Ty, Rx, Ry split signals |
| Process Technology | Bipolar |
| Package | SOIC-8 (SOT96-1) |
| Mounting Type | Surface Mount |
| Ordering Code Suffix | /S410,118 (tape and reel, standard packing) |
P82B96TD-S410118 Pin Configuration
| Pin 1 | L1 — Buffer 1 logic-side port (Lx) |
| Pin 2 | GND — Ground |
| Pin 3 | H1 — Buffer 1 high-voltage-side port (Hx) |
| Pin 4 | L2 — Buffer 2 logic-side port (Lx) |
| Pin 5 | S2 — Buffer 2 standard I2C logic port (Sx) |
| Pin 6 | H2 — Buffer 2 high-voltage-side port (Hx) |
| Pin 7 | VCC — Supply voltage |
| Pin 8 | S1 — Buffer 1 standard I2C logic port (Sx) |
Typical Applications
P82B96TD-S410118 is suitable for 6 applications: Long-Distance I2C Bus Extension, Mixed-Voltage Level Translation (3.3 V to 15 V), SMBus Systems, Industrial Control and Automation, Automotive Body Electronics, Display and Peripheral Expansion.
Long-Distance I2C Bus Extension
The P82B96TD/S410,118 is purpose-built for extending the I2C-bus beyond the standard 400 pF capacitance limit. According to NXP, the buffer enables reliable I2C operation at 400 kHz over cable lengths up to 40 m. Its bipolar output stages drive low-impedance lines that ordinary I2C open-drain pins cannot, and the split Tx/Rx signal architecture lets designers insert dedicated line-driver transistors on either side for even longer runs. In a typical installation, one P82B96 channel carries SCL and the other carries SDA, with pull-up resistors sized independently for each cable segment. This quantified 40 m capability at full 400 kHz speed makes the part a standard choice for connecting remote sensor clusters or display modules to a central controller.
Recommended
Mixed-Voltage Level Translation (3.3 V to 15 V)
Many industrial systems combine 3.3 V microcontrollers with 12 V or 15 V peripheral bus segments, and the P82B96TD/S410,118 bridges these domains directly. Per the NXP product description, the device interfaces I2C-bus logic signals to similar buses having different voltage and current levels - specifically 350 uA SMBus systems, 3.3 V logic devices, and 15 V levels or low-impedance lines. Each buffer channel offers three ports (Sx, Lx, Hx), allowing the designer to reference each side to its own supply domain without extra discrete translators. Because the part is non-latching, multi-master arbitration across voltage domains proceeds safely. The wide 3 V to 12.5 V supply range per NXP product information simplifies single-rail designs.
Recommended
SMBus Systems
The P82B96TD/S410,118 interfaces standard I2C controllers to 350 uA SMBus segments, as stated in the NXP product description. SMBus (System Management Bus) devices source only limited pull-up current, so directly connecting them to heavily loaded or long buses violates current budgets. Placing the P82B96 between the SMBus segment and the main bus isolates the 350 uA segment while preserving bidirectional protocol transparency at up to 400 kHz. Because the buffer is non-latching, SMBus clock-pulse-stretching behavior is passed through without lock-up. Typical deployments include server power-supply management, battery-charger telemetry, and rack-level health monitoring where SMBus devices from multiple vendors coexist on buffered segments.
Recommended
Industrial Control and Automation
Factory environments impose long distances, electrical noise, and mixed voltage levels on serial buses, all of which the P82B96TD/S410,118 addresses. Its bipolar technology provides robust, low-impedance drive tolerant of noisy industrial grounds, and the 40 m cable support at 400 kHz (per NXP) covers machine-to-machine wiring runs within a production cell. The ability to shift to 15 V bus levels improves noise margins over 3.3 V signaling, a practical benefit in installations with variable-frequency drives and relay coils. Designers typically buffer each remote I2C cluster with one P82B96, isolating cable capacitance per segment so each segment can be fully loaded at fast-mode speed. Non-latching operation keeps arbitration safe in multi-master control topologies.
Recommended
Automotive Body Electronics
Automotive modules frequently need I2C connectivity across harness sections with significant capacitance and differing supply domains, and the buffered, level-tolerant P82B96TD/S410,118 fits this role. The split Tx/Ry forward-reverse architecture lets engineers drive the harness with external bipolar transistors sized for automotive load-dump environments, while the 15 V level capability covers 12 V battery-domain buses directly. Operating from a nominal 5 V supply with the wide tolerance described in NXP product information, the device buffers lighting-control, seat-adjustment, and sensor-aggregation modules from a central body controller. Short per-segment buffering keeps each I2C branch below the 400 pF capacitance limit at 400 kHz, maintaining timing margin across temperature extremes typical of vehicle cabins and engine bays.
Recommended
Display and Peripheral Expansion
Remote display modules, keypads, and I/O expander clusters connected to a controller over several meters exceed raw I2C drive capability, so the P82B96TD/S410,118 is inserted per cable run. The NXP specification of 40 m bus length at 400 kHz means a display can sit far from the host while retaining full fast-mode refresh. Each channel absorbs the cable and expander capacitance on its side, so the host bus sees only the buffer's Sx port load. Typical companion devices at the remote end are I2C GPIO expanders driving backlight, touch, and LED indicators. Pull-up sizing is done per segment - typically lower resistance (stronger pull-up) on the cable side to counteract capacitance, standard values on the controller side.
Recommended
Recommended Products Summary
Engineering reference data for P82B96TD-S410118 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | P82B96D | P82B96DR | PCA9600D |
|---|---|---|---|---|
| Package | SOIC-8 (SOT96-1) | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | NXP Semiconductors | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Non-Latching Operation | Yes | Yes | Yes | Yes |
Key Differentiators
- Wide 15 V bus-level support (vs TCA9517DR)
- 40 m bus extension capability (vs TCA9517DR)
- Same-die continuity from Texas Instruments (vs P82B96D)
Design Notes
Size pull-up resistors independently for each bus segment on either side of the P82B96. The Sx ports follow standard I2C pull-up practice, but the Lx and Hx ports use biasing currents that interact with pull-up values - a pull-up chosen for the whole bus as if it were unbuffered will cause rise-time failures at 400 kHz on long or heavily loaded segments. The NXP datasheet application section provides the sizing procedure for the split Tx/Rx topology; follow it rather than reusing unbuffered I2C values.
When extending the bus over 40 m of cable, route SCL and SDA with a ground return conductor (or use shielded cable with the shield grounded at one end) to control crosstalk and common-mode noise. The bipolar outputs of the P82B96 provide low-impedance drive, but reflections and coupling on unterminated cable still degrade edges at 400 kHz. Keep stub lengths short on buffered branches and place a single P82B96 at each cable endpoint rather than daisy-chaining multiple buffers without analysis.
Decouple VCC (pin 7) with a 100 nF ceramic capacitor placed within a few millimeters of the pin, plus bulk capacitance per board standard. Because the P82B96 drives low-impedance lines, supply current rises with bus loading and frequency; verify the supply can deliver the worst-case buffered-segment current. Ensure the VCC rail is within the specified operating range of the device and that all bus segments never exceed the device limiting values during transients such as load dump in automotive systems.
Compliance Information
The NXP product page lists an Environmental Quality section for P82B96TD; specific RoHS/REACH status values were not present in the retrieved data. The ',118' ordering suffix conventionally indicates NXP standard RoHS-compliant packing, but confirm via the NXP product page environmental documentation.
