P82B715PN - 2-Bit I2C Bus Extender | NXP
MPN: P82B715PN ✓ ActiveP82B715PN Overview
An I2C bus extender is a bidirectional interface IC that regenerates or buffers clock and data signals rather than acting as a one-way logic buffer. The P82B715PN buffers both halves of a two-wire bus, allowing a master and one or more slaves to communicate across a greater physical distance than would normally be practical for an unbuffered I2C connection. Its 400 kHz operating capability preserves compatibility with conventional standard-speed I2C systems while supporting buffered-bus implementations.
The P82B715PN is implemented as a bipolar integrated circuit and retains the operating modes and features associated with the I2C bus while adding buffered SDA and SCL paths. The operating-voltage range of 3 V to 12 V permits use in systems powered from common low-voltage rails. As a bidirectional extender, it can support applications in which either side of the buffered segment must participate in the bus transaction.
The key engineering benefit is increased separation between communicating components, with the supplied documentation describing extension to approximately 50 m to 100 m depending on bus implementation. That distance should not be treated as a universal guarantee because cable capacitance, pull-up resistance, bus speed, topology, and termination remain important variables. The 400 kHz limit also means slower I2C rates can provide greater margin in long or capacitively loaded installations.
Typical uses include long industrial sensor buses, distributed I2C peripheral connections, remote instrumentation, and retrofit systems where existing cabling must be reused. The device is also useful in derivative bus systems that require a buffered clock and data pair. Because it buffers rather than translates voltage levels, both connected bus segments must use compatible logic levels and the device must remain within its 3 V to 12 V supply range.
When designing around the P82B715PN, verify pull-up placement, total bus capacitance, and signal rise time before committing to a long cable. The 400 kHz maximum bus rate leaves less timing margin than lower-rate operation, particularly when cable capacitance is high. A shorter cable, lower I2C clock rate, or properly selected pull-up network may be required when the installation approaches the upper end of the documented distance range.
This page consolidates the verified NXP, Texas Instruments, distributor, and technical-index information for the P82B715PN, distinguishes confirmed characteristics from unavailable parameters, and provides a conservative drop-in assessment rather than presenting functionally similar interface ICs as unqualified replacements.
Drop-in alternatives for P82B715PN — 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 P82B715PN (same form factor and footprint) — differing in Package, Product Type.
P82B715P
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View Datasheet →P82B715PN Specifications
| Product Type | 2-bit bidirectional I2C bus extender |
| Technology | Bipolar integrated circuit |
| Supported Bus | I2C and derivative bus systems |
| Buffered Signals | 2 lines: SDA and SCL |
| Supply Voltage Range | 3 V to 12 V |
| Maximum Bus Frequency | 400 kHz |
| Directionality | Bidirectional |
| Package | 8-pin PDIP (SOT97-1) |
| Pin Count | 8 pins |
| Mounting Type | Through-hole |
| Extended Bus Separation | Approximately 50 m to 100 m |
P82B715PN 8-pin pdip (sot97-1) Pin Configuration Guide
Pin configuration for P82B715PN (8-pin pdip (sot97-1) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for P82B715PN.
Refer to the datasheet for full pin configuration.
Typical Applications
P82B715PN is suitable for 6 applications: Long-Distance Industrial Sensor Bus, Remote Instrumentation and Measurement, Retrofit Building and HVAC Networks, Distributed Sensor and Actuator Backplane, Industrial Control Module, Legacy Peripheral Cable Extension.
Long-Distance Industrial Sensor Bus
The P82B715PN fits distributed industrial sensor networks where SDA and SCL must travel farther than an unbuffered I2C connection permits. Its two bidirectional channels buffer both clock and data, while the verified 3 V to 12 V supply range supports common embedded rails and the 400 kHz maximum rate accommodates conventional I2C traffic. A technician page describes extension to approximately 50 m to 100 m, but that distance is installation-dependent. Cable capacitance, pull-up resistance, topology, and signal rise time must be verified before deployment.
Recommended
Remote Instrumentation and Measurement
The P82B715PN can separate a remote instrument cluster from a central controller by buffering the SDA and SCL conductors. Its 400 kHz operating limit supports standard-speed I2C operation, while bidirectional communication allows devices on either side of the extender to participate in a transaction. The documented 50 m to 100 m extension range makes it relevant to laboratory and process-monitoring installations, provided the actual cable and pull-up network preserve acceptable rise and fall times.
Recommended
Retrofit Building and HVAC Networks
The P82B715PN is suitable for retrofitting distributed HVAC sensors, controllers, and actuators over existing wiring. Buffering both I2C lines can improve the practical separation between a controller board and remote room equipment, while the 3 V to 12 V supply range accommodates embedded systems. Because the extender does not perform voltage-level translation, every connected device must use compatible logic levels. Long cable runs should use a lower clock rate when capacitance prevents the 400 kHz limit from being met reliably.
Recommended
Distributed Sensor and Actuator Backplane
The P82B715PN can buffer clock and data between segmented sensor or actuator backplanes where direct capacitive loading would be undesirable. Its bidirectional 2-bit architecture maintains communication in both directions, and the 8-pin PDIP package supports conventional through-hole prototyping. A design using this device should divide the bus into electrically manageable segments, place pull-ups where required by the wiring topology, and verify that the selected I2C rate remains below the verified 400 kHz maximum.
Recommended
Industrial Control Module
The P82B715PN fits industrial control modules that connect a central processor to remote sensors through an I2C derivative bus. Its bipolar implementation, 3 V to 12 V supply range, and bidirectional buffering are suited to extending two-wire interconnections without redesigning the cable route. The principal trade-off is that the 400 kHz maximum rate and unverified transient, temperature, and power specifications require conservative engineering. Designers should preserve ground continuity and test the assembled wiring under worst-case load and temperature conditions.
Recommended
Legacy Peripheral Cable Extension
The P82B715PN can extend a legacy I2C connection between a controller and peripheral equipment without replacing the complete bus architecture. Its SDA and SCL buffering supports two-way transactions across the buffered segment, and the through-hole 8-PDIP package is convenient for maintenance and industrial repair boards. Existing cabling should be characterized for capacitance and continuity, while pull-up values should be checked rather than assumed unchanged. The documented 50 m to 100 m use case should be treated as a starting point for testing, not a guaranteed installation limit.
Recommended
Recommended Products Summary
Engineering reference data for P82B715PN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | P82B715P |
|---|---|---|
| Product Type | 2-bit bidirectional I2C bus extender | I2C buffer/redriver |
| Brand | NXP Semiconductors | Texas Instruments |
| Package | 8-pin PDIP (SOT97-1) | 8-PDIP |
| Pin Count | 8 pins | 8 pins |
Key Differentiators
- Bidirectional buffering of both I2C clock and data (vs P82B715P)
- Verified 3 V to 12 V operating range (vs P82B715P)
- Defined 400 kHz standard-speed I2C ceiling (vs P82B715P)
Design Notes
Treat the P82B715PN as a bus-segment extender, not as a substitute for correct I2C wiring. Verify the pull-up network, total capacitance, and the 400 kHz maximum clock rate at the end of the longest connected cable. A long run can increase rise time even when the extender isolates the two bus segments. If the required operating distance approaches the documented 50 m to 100 m range, reduce the I2C clock rate and validate signal integrity over temperature.
Place the P82B715PN so that the two buffered bus segments are physically separated and their ground-return path remains continuous. Follow the manufacturer's recommended decoupling arrangement from the datasheet; the supplied verified data does not specify capacitor values, so those values must not be guessed. In a through-hole design, provide adequate clearance around the 8-pin PDIP body and avoid long unprotected stubs on either side of the extender.
Do not assume that the P82B715PN translates voltage levels or changes the underlying I2C protocol. Connected devices on both sides must use compatible logic levels, and the complete system must remain within the verified 3 V to 12 V supply range. Also avoid treating functionally similar devices such as the TCA9517, TCA9518, or P82B716 as drop-in replacements until their packages, pinouts, voltage ranges, and electrical behavior have been compared with the P82B715PN.
Compliance Information
The supplied web results do not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements. AEC-Q100 is marked not applicable because this is an industrial/consumer interface IC and no automotive qualification is shown; any project-specific automotive requirement must still be confirmed with the manufacturer.
