P82B715DG4 - 2-Bit I2C Bus Extender | Texas Instruments
MPN: P82B715DG4 ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
P82B715DG4 Overview
An I2C bus extender is an interface IC placed within an I2C system when cable length or bus capacitance prevents reliable communication. It belongs to the hierarchy of bus buffers and redrivers within interface ICs, allowing a controller and remote devices to communicate over a longer bus while preserving two-wire, open-drain signaling. The P82B715 uses analog current amplification to increase the current-sink capability of the I2C devices.
Key features include a 250 ns delay time, 22 mA supply current, and an 8-SOIC package. The device supports a 12 V operating supply and is intended for 400-kHz I2C bus systems. Its bidirectional architecture allows the SDA and SCL paths to carry data in either direction without changing the logical behavior of the connected I2C system.
Technically, the P82B715 is a bipolar device intended for I2C applications. Unidirectional analog current amplification on each internal path increases the current available to sink bus capacitance. This helps overcome the conventional 400-pF main-bus limitation while the extender supplies a larger allowable wiring capacitance on the transmission side. The result is improved signal rise time and more reliable communication across extended wiring.
Typical applications include industrial control panels, building-automation equipment, sensor networks, programmable logic controller interfaces, and long cable runs between an I2C controller and remote peripherals. It is especially useful when the existing bus must be extended without redesigning the host controller or remote I2C devices.
The primary design consideration is bus topology: connect the main bus, transmission bus, pull-up networks, and ground return exactly as shown in the manufacturer application guidance. Avoid introducing unnecessary stubs, and account for cable capacitance and rise-time margin at the selected 400-kHz operating rate.
This page consolidates verified manufacturer and distributor facts, drop-in replacement evidence, and practical interface-design guidance into one engineering-oriented reference. It also distinguishes verified values from parameters that still require confirmation from the complete manufacturer datasheet.
Drop-in alternatives for P82B715DG4 — 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 P82B715DG4 (same form factor and footprint) — differing in Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
P82B715DR
✅ Drop-In✓ In Stock
$0.7587 / Unit
View Datasheet →P82B715TD,118
✅ Drop-In📋 Reference alternative (not in catalog)
P82B715DG4 Specifications
| Channel Count | 2 bits |
| Bus Type | I2C/SMBus |
| Device Type | Bidirectional buffer and cable extender |
| Operating Supply Voltage Range | 3 V to 12 V |
| Maximum I2C Bus Frequency | 400 kHz |
| Delay Time | 250 ns |
| Supply Current | 22 mA |
| Data Direction | Bidirectional |
| Main I2C Bus Capacitance | 400 pF |
| Transmission Bus Wiring Capacitance | 3 nF |
| Signal Amplification Method | Unidirectional analog current amplification |
| Supported Bus Speed | 400-kHz I2C bus |
| Package | 8-SOIC, 0.154 inch (3.90 mm) width |
| Mounting Type | Surface mount |
| Logic Level | I2C-compatible open-drain signaling |
P82B715DG4 8-soic, 0.154 inch (3.90 mm) width Pin Configuration Guide
Pin configuration for P82B715DG4 (8-soic, 0.154 inch (3.90 mm) width 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 P82B715DG4.
Refer to the datasheet for full pin configuration.
Typical Applications
P82B715DG4 is suitable for 6 applications: Industrial Sensor Bus Extension, Building Automation Control Panel, Remote Programmable Controller Interface, Long Cable Audio-Control Link, Smart Home Sensor Network, Communication Equipment Status Module.
Industrial Sensor Bus Extension
The P82B715DG4 fits industrial I2C sensor networks that need remote sensors connected over a cable instead of remaining on a short local PCB bus. Its two bidirectional channels support SDA and SCL at up to 400 kHz, while analog current amplification increases sink capability for the transmission side. The verified 3-nF transmission-bus wiring limit provides more design margin than the conventional 400-pF main-bus limit. Engineers should still calculate total remote capacitance, pull-up current, and rise time, because the device cannot compensate for an incorrectly sized pull-up network or a branched topology.
Recommended
Building Automation Control Panel
The P82B715DG4 is useful in building-automation controllers when sensors or I2C modules are mounted remotely from the main controller board. Its bidirectional operation preserves normal SDA and SCL transactions across the cable, while the 3 V to 12 V operating range allows integration with common interface rails. At the 400-kHz maximum rate, maintain a low-capacitance cable and place the extender where both sides can maintain a short return path. The 250 ns device delay is relevant when budgeting timing margins across the complete system.
Recommended
Remote Programmable Controller Interface
The P82B715DG4 can connect a programmable controller to I2C peripherals installed on another board or in a remote enclosure. Its 2-bit bidirectional architecture carries both SDA and SCL, and its 22 mA supply current provides a defined starting point for power budgeting. Because this is an interface extender rather than a protocol converter, the host and target must retain compatible I2C logic levels. Review the 250 ns propagation delay against controller timing and verify the manufacturer's recommended wiring and pull-up arrangement.
Recommended
Long Cable Audio-Control Link
The P82B715DG4 is appropriate for a low-speed control link that carries I2C commands or status between an audio system controller and a remote module. The extender's purpose is bus integrity, not audio-signal bandwidth: it strengthens the bidirectional clock and data paths at rates up to 400 kHz. Use a short main-bus segment, keep the transmission cable away from high-current switching nodes, and choose pull-ups that satisfy both sides' rise-time requirements. The 3-nF transmission wiring allowance can make this topology more reliable than an unbuffered remote I2C connection.
Recommended
Smart Home Sensor Network
The P82B715DG4 can extend an I2C sensor network in a smart-home gateway when wall wiring, panel distance, or attached peripheral capacitance would weaken the original bus. Bidirectional SDA and SCL operation keeps the topology transparent to the host controller, and the 400-kHz operating limit supports typical configuration and status transactions. Use the extender at the physical boundary of the remote branch and observe the 3-nF transmission-side limit. The verified operating-temperature and environmental-certification data are incomplete, so enclosure temperature and EMC conditions should be reviewed separately.
Recommended
Communication Equipment Status Module
The P82B715DG4 is suitable for a communication module that monitors or configures a remote board over I2C. Its two-wire bidirectional extension avoids adding a separate full-duplex link, while analog current amplification helps the controller and peripheral complete transitions on a practical cable run. Keep the interface at 400 kHz or below and calculate worst-case bus rise time under all pull-up tolerances. The 250 ns delay and 22 mA supply current should be included in the timing and power review, respectively.
Recommended
Recommended Products Summary
Engineering reference data for P82B715DG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | P82B715DR | P82B715TD,118 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC, 0.154 inch (3.90 mm) width | 8-SOIC | 8-SOIC |
| Device Function | Bidirectional I2C/SMBus buffer and cable extender | P82B715 family I2C bus extender | P82B715 family I2C bus extender |
| Channel Count | 2 bits | 2 bits | 2 bits |
Key Differentiators
- Higher verified transmission-bus wiring allowance (vs P82B715DR)
- Explicit 400-kHz bidirectional operation (vs P82B715TD,118)
- Documented 250 ns delay (vs P82B715DR)
Design Notes
Follow the manufacturer application topology and keep the main I2C segment short, with the P82B715DG4 positioned at the boundary of the transmission branch. The verified interface supports a 400-pF main bus and up to 3 nF of transmission-bus wiring. Route the cable-side SDA and SCL traces as a short pair, minimize stubs, and preserve a nearby ground reference so high-frequency bus current does not induce unwanted voltage differences.
Budget the P82B715DG4 supply path around the verified 22 mA supply current, while also checking the current drawn by the pull-up network and the attached I2C devices. Place local supply decoupling close to the device pins and keep the interface supply within the verified 3 V to 12 V range. Because the source data does not state decoupling values or supply tolerances, use the manufacturer datasheet and typical application circuit before finalizing capacitor selection.
Size pull-ups for the worst-case combined main-bus and cable capacitance, not for the 3-nF transmission limit alone. At the maximum 400-kHz operating rate, excessive pull-up resistance can make rise times too slow, while excessively low resistance increases sink current and may exceed an attached device's capability. Include the verified 250 ns extender delay in system timing analysis and verify that the remote-side bus voltage remains within the logic specification.
Do not treat the P82B715DG4 as an isolated transceiver or as a level shifter. It is a bidirectional I2C/SMBus extender for compatible logic voltages, and both sides must share the appropriate ground reference. Verify the complete manufacturer pinout before PCB reuse because the supplied snippets confirm the 8-SOIC package but do not expose all eight pin assignments. Also confirm operating temperature and lifecycle details against the official product documentation.
Compliance Information
The supplied search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the package or manufacturer.
