P82B96PWG4 - 2-Channel 400kHz I2C Bus Buffer | Texas Instruments
N.º de pieza: P82B96PWG4 ✓ ActivoP82B96PWG4 Descripción general
An I2C bus buffer is an interface IC placed within a controller-to-peripheral bus path to extend reach, isolate bus segments, reconcile voltage domains, and improve capacitive loading behavior. The P82B96 belongs to the bidirectional bus buffer family within the broader interface IC and semiconductor hierarchy. It is useful where one I2C controller must communicate with remote devices across cable or PCB-routing distances.
Key features include two independently buffered bidirectional channels, a 400 kHz operating frequency, operation over a 2 V to 15 V supply range, and support for connecting I2C buses with different logic levels. The 8-TSSOP package supports compact surface-mount layouts. According to the manufacturer datasheet, the device also handles the added low period associated with bus capacitance and clock stretching while preserving standard I2C timing behavior.
The P82B96 architecture uses passive-style bus-side connections in the familiar I2C arrangement, allowing each buffered segment to communicate in both directions. Designers should account for the device's internal delay, pull-up placement, capacitance limits, and voltage compatibility when calculating timing and fault behavior. The manufacturer states that the actual bus-clock period, including a 482 ns clock-stretch effect, can be limited to approximately 2745 ns, corresponding to about 364 kHz under the cited condition.
Typical applications include extending an I2C sensor bus across a larger PCB, isolating a high-capacitance peripheral segment, bridging sections of an industrial control system, and supporting low-voltage logic domains on one side and higher-voltage I2C devices on the other. It is also suitable for cable-based I2C extensions where the permitted bus capacitance is confirmed by system calculations.
A key design consideration is pull-up placement: each I2C bus segment normally requires its own appropriate pull-up network, and placing pull-ups on the wrong side of the buffer can undermine isolation or exceed the permitted capacitance. Verify timing with the slowest participating device, clock stretching, cable length, and actual bus capacitance rather than relying only on the nominal 400 kHz rating.
This page consolidates verified manufacturer and distributor information, a drop-in-alternative assessment, application guidance, and practical interface-design considerations into a design-oriented reference for engineers evaluating the P82B96PWG4.
Alternativas directas para P82B96PWG4 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con P82B96PWG4 (mismo factor de forma y huella) — difiere en Bidirectional Data Transfer.
P82B96PW
✅ Sustitución directaConsulte el precio
Ver hoja de datos →P82B96PWRG4
✅ Sustitución directaConsulte el precio
Ver hoja de datos →P82B96PWG4 Especificaciones
| Device Type | 2-bit dual bidirectional I2C/SMBus buffer and cable extender |
| Number of Channels | 2 channels |
| Operating Supply Voltage Range | 2 V to 15 V |
| Maximum Operating Frequency | 400 kHz |
| Bidirectional Data Transfer | Supported for I2C bus signals |
| Different Logic-Level Bus Interconnection | Supported |
| Main I2C Bus Capacitance | 400 pF |
| Bus Clock Period Under 482 ns Clock-Stretch Condition | 2745 ns minimum, equivalent to 364 kHz |
| Package Type | 8-TSSOP |
| Package Width | 4.40 mm |
| Lead Pitch | 0.65 mm |
| Número de pines | 8 pins |
| Tipo de montaje | Surface mount |
| Terminal Count | 8 |
| Package Shape | Rectangular |
| Lead Form | Gull wing |
| Temperature Grade | Industrial |
Configuración de pines de P82B96PWG4
| Pin 1 | S0 — Bidirectional bus-side connection for channel 0 |
| Pin 2 | S1 — Bidirectional bus-side connection for channel 1 |
| Pin 3 | GND — Ground reference |
| Pin 4 | VCC — Power supply |
| Pin 5 | S2 — Bidirectional bus-side connection for channel 2 |
| Pin 6 | S3 — Bidirectional bus-side connection for channel 3 |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | NC — Not connected (per datasheet) |
Aplicaciones típicas
P82B96PWG4 es adecuado para 6 aplicacións: I2C Sensor-Bus Extension, Different-Logic-Level I2C Bridging, Industrial Control-System Bus Isolation, Portable-Device I2C Routing, I2C Cable Extender, High-Capacitance Peripheral Segmentation.
I2C Sensor-Bus Extension
The P82B96PWG4 fits long or heavily routed sensor-bus sections because it provides two bidirectional channels, operates at up to 400 kHz, and supports main-bus capacitance up to 400 pF. Place the buffer where the controller-side and sensor-side I2C segments meet, then provide pull-ups for each segment. This arrangement can isolate capacitance beyond the controller's preferred loading while preserving bidirectional SDA and SCL communication. Validate the timing margin using the slowest sensor, actual cable capacitance, and the buffer's added low period rather than assuming the nominal 400 kHz rate remains available under all conditions.
Recomendado
Different-Logic-Level I2C Bridging
The P82B96PWG4 is useful when a low-voltage controller must communicate with higher-voltage I2C peripherals because the device supports buses operating at different logic levels and a 2 V to 15 V supply range. Each buffered side can be referenced to its own logic domain, subject to the peripheral's signal tolerances. Separate pull-up networks should terminate the controller and peripheral segments. This arrangement helps isolate voltage domains and bus loading, but the engineer must confirm input thresholds, pull-up voltages, and supply sequencing for every attached device before implementation.
Recomendado
Industrial Control-System Bus Isolation
The P82B96PWG4 can isolate sections of an industrial I2C control bus, helping keep capacitive loading and fault effects away from the controller-side segment. Its 2-channel bidirectional architecture supports both SDA and SCL extension in one 8-TSSOP device, while the 400 kHz maximum and 400 pF main-bus capacitance provide defined operating limits. For machinery, sensors, and distributed I/O, place independent pull-ups on both sides and verify cable length, transient exposure, grounding, and device-level EMC requirements. The buffer improves segmentation but does not replace surge protection or isolation designed for hazardous environments.
Recomendado
Portable-Device I2C Routing
The P82B96PWG4 fits portable systems where a compact PCB must route an I2C bus between tightly grouped sensors and another board section. Its 8-TSSOP package is smaller than a dual-buffer solution using two separate ICs, and the device supports up to 400 kHz operation with logic levels spanning 2 V to 15 V. Keep each segment's pull-up voltage consistent with the devices it serves and route the protected trace away from noisy power or switching nodes. Confirm the package footprint, exposed thermal requirements, and total bus capacitance during board planning because the buffer cannot compensate for an overloaded bus.
Recomendado
I2C Cable Extender
The P82B96PWG4 supports cable-based I2C extension when the main bus remains within the specified 400 pF capacitance limit. Both channels transfer bidirectionally, allowing controller SDA and SCL signals to reach a remote cable segment through the same buffer. The 400 kHz rating is suitable for standard-mode and most fast-mode traffic, but actual performance also depends on cable capacitance, pull-up resistance, and clock stretching. Texas Instruments cites a 2745 ns minimum bus-clock period under a 482 ns stretch condition, or about 364 kHz, so timing verification should include the remote peripheral rather than relying on the headline frequency alone.
Recomendado
High-Capacitance Peripheral Segmentation
The P82B96PWG4 can divide a high-capacitance I2C peripheral network into smaller bus sections, allowing the controller to communicate with the buffered segment through only two active channels. This reduces the load seen at the controller relative to one large shared bus, provided the remote segment remains below 400 pF and has appropriate pull-ups. The 2 V to 15 V operating range also accommodates different logic domains. Check the slowest peripheral for clock stretching and measure rise time on the longest branch, since adding a buffer introduces timing delay that must be included in the complete I2C timing budget.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para P82B96PWG4 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | P82B96PW | P82B96PWRG4 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-TSSOP | 8-TSSOP - same | 8-TSSOP - same |
| Device Type | Dual bidirectional I2C bus buffer | Dual bidirectional I2C bus buffer | Dual bidirectional I2C bus buffer |
| Number of Channels | 2 | 2 | 2 |
| Operating Supply Voltage Range | 2 V to 15 V | 2 V to 15 V | 2 V to 15 V |
| Maximum Operating Frequency | 400 kHz | 400 kHz | 400 kHz |
| Main Bus Capacitance | 400 pF | 400 pF | 400 pF |
| Different Logic-Level Support | Supported | Supported | Supported |
| Ordering Form | P82B96PWG4 tube ordering code | P82B96PW ordering code | P82B96PWRG4 tape-and-reel ordering code |
Diferenciadores clave
- Directly documented same-family alternatives (frente a P82B96PW)
- Assembly-compatible ordering flexibility (frente a P82B96PWRG4)
- Two logic domains in one device (frente a P82B96DGKR)
Notas de diseño
Calculate the complete I2C timing budget with the actual bus capacitance, pull-up resistance, slowest peripheral, and any clock stretching. According to the Texas Instruments P82B96 datasheet, a 482 ns clock-stretch effect can produce a bus-clock period of at least 2745 ns, or approximately 364 kHz, even though the nominal device rate is 400 kHz. Measure rise time at the far end rather than assuming the nominal frequency is preserved in every loaded configuration.
Route the P82B96PWG4 as a deliberate bus-segment boundary. Keep the two buffered bus sections electrically separated except through the device, provide a continuous ground reference, and place each segment's pull-up network near the devices it serves. Avoid long stubs from the buffer, because capacitive stubs can undermine the benefit of segmentation. Follow the manufacturer connection diagram when assigning the S0 through S3 bus connections and power pins.
Do not treat P82B96PW, P82B96PWG4, and P82B96PWRG4 as three electrically different solutions; they are orderable forms of the same P82B96 family. Conversely, do not substitute P82B96DGKR into an 8-TSSOP footprint without a PCB change because its VSSOP outline differs. Confirm the suffix, package, assembly shipping form, and environmental ordering requirements before releasing the purchase order.
Información de cumplimiento
The supplied verified snippets identify the part, package, industrial temperature grade, and manufacturer documentation but do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
