PCA9507 - I2C Bus Extender 3.3V-5V Level Shift | NXP
N.º de pieza: PCA9507 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.25 | $1,25 |
| 10 | $1.12 | $11,20 |
| 100 | $0.95 | $95,00 |
| 500 | $0.82 | $410,00 |
| 1.000 | $0.69 | $690,00 |
PCA9507 Descripción general
A bus extender, also called an I2C buffer or bus repeater, is an interface IC that sits between a controller segment and a peripheral segment of a two-wire bus. Within the power-management-of-signals hierarchy (bus extender -> I2C buffer/repeater -> interface IC -> semiconductor), its role is to isolate bus capacitance and translate logic levels so that each segment can be optimized independently for drive strength and voltage.
Key features include bidirectional buffering of both SDA and SCL, allowing total bus capacitance to exceed the standard 400 pF single-segment limit by splitting it across segments. The built-in level shift permits a 3.3 V controller to talk directly to a 5 V device rail without discrete MOSFET translators. Support for 18 m of cable is roughly 40x the typical practical I2C length, enabled by the accelerator (active pull-up) circuitry that sharpens rising edges.
Architecturally, the PCA9507 uses a rise-time accelerator on both sides that sources current into the bus during low-to-high transitions, compensating for RC delay on long cables or heavy loads. This keeps duty cycle distortion low at the 400 kHz Fast-mode ceiling. Because it retains all I2C-bus operating modes during level shifts, multi-master and clock-stretching behavior is preserved.
Typical applications include HDMI DDC channel extension between source and display, long-reach SMBus backplanes in servers and telecom racks, and I2C fan-out in industrial control cabinets where sensors sit meters from the master.
Design consideration: allocate adequate pull-up resistance per segment - the accelerator assists edges but does not replace pull-ups; verify segment capacitance budget separately on each side of the buffer.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and application guidance not found in a single manufacturer datasheet.
Alternativas directas para PCA9507 — 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 PCA9507 (mismo factor de forma y huella) — difiere en Function, Package, Number of Channels, RoHS Status, Direction Control.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PCA9517D,118
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
PCA9617A
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
PCA9511AD,118
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.96 / unidad
Ver hoja de datos →PCA9510ADP,118
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
Consulte el precio
Ver hoja de datos →PCA9515AD,118
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
TCA9517DR
✅ Sustitución directa✓ En stock
$0.53 / unidad
Ver hoja de datos →PCA9507 Especificaciones
| Función | 2-wire serial bus extender (I2C buffer/level shifter) |
| Applications | HDMI DDC, I2C-bus, SMBus |
| Level Shift | 3.3 V to 5 V |
| Maximum Bus Length | 18 m |
| Velocidad de datos | 400 kHz |
| Number of Channels | 1 |
| Encapsulado | 8-SO (SOIC-8) |
| Tipo de montaje | Surface Mount |
| Número de pines | 8 |
| Rise Time Accelerator | Yes (bidirectional SDA/SCL accelerator) |
Guía de configuración de pines de PCA9507 8-so (soic-8)
Configuración de pines para PCA9507 (encapsulado 8-so (soic-8)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para PCA9507.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
PCA9507 es adecuado para 6 aplicacións: HDMI DDC Channel Extension, Long-Reach SMBus Backplanes, Industrial I2C Fan-Out in Control Cabinets, Display and Panel Control Interfaces, Battery Management and Hot-Swap Monitoring Buses, Networking Equipment Management Buses.
HDMI DDC Channel Extension
In HDMI source-to-sink paths, the DDC channel carries EDID and HDCP authentication data over I2C at 100-400 kHz. The PCA9507 fits this application directly because the NXP datasheet explicitly names HDMI DDC as a target bus, and its 3.3 V to 5 V level shift bridges the typical source-side 3.3 V and sink-side 5 V domains transparently. Placed in the DDC SDA and SCL path near the connector, its bidirectional accelerator sharpens rising edges degraded by cable capacitance, and its 18 m extension rating comfortably covers long in-wall or rack HDMI runs. The trade-off is added propagation delay, negligible at DDC speeds but worth confirming in HDCP timing margins.
Recomendado
Long-Reach SMBus Backplanes
Server, telecom, and power-shelf backplanes use SMBus to monitor PSU, fan, and hot-swap controllers, and bus lengths of several meters are common between a BMC and far-end modules. The PCA9507 suits this because it retains SMBus operating modes during buffering and its 18 m extension capability exceeds typical rack backplane runs with margin. Its rise-time accelerator compensates for the heavy capacitance of distributed monitoring loads, while the 400 kHz rating covers standard SMBus 100 kHz operation with headroom. Designers should size pull-ups per segment and verify that SMBus clock low extend behavior passes through the buffer as expected in multi-slave trees.
Recomendado
Industrial I2C Fan-Out in Control Cabinets
Industrial control cabinets often place PLC I/O, sensors, and EEPROM configuration devices meters away from the master controller, violating the capacitance-limited reach of a direct I2C bus. The PCA9507 addresses this by isolating capacitance into two segments and actively accelerating edges, enabling 18 m runs through cable trays at 400 kHz. Its 3.3 V to 5 V level shift allows modern 3.3 V microcontrollers to talk to legacy 5 V sensors and serial EEPROMs without discrete translators. Industrial environments should route the buffered bus away from motor drives and contactor switching noise; the accelerator's active pull-up improves noise margin on falling-edge-induced glitches at these distances.
Recomendado
Display and Panel Control Interfaces
Large displays and digital signage panels distribute I2C control buses across backlight, timing, and scaler boards separated by tens of centimeters to meters of flex and cable. The PCA9507 fits because it preserves all I2C operating modes during level shift, keeps EDID and control traffic reliable across board-to-board cabling, and supports the 5 V rails common on panel power boards from 3.3 V scaler chipsets. Its single-channel buffering of both SDA and SCL is sufficient for one control tree; multiple display buses each need one PCA9507. Designers should decouple the buffer supply locally and verify total segment capacitance stays within I2C limits per segment.
Recomendado
Battery Management and Hot-Swap Monitoring Buses
Battery packs and hot-swap shelves serialize SMBus monitoring across cell boards and modules spaced by cable harnesses, creating long, capacitive buses. The PCA9507 is appropriate because its 18 m extension capacity and edge acceleration keep SMBus traffic reliable across harness runs, and its 3.3 V to 5 V translation interfaces 3.3 V gauge MCUs with 5 V SMBus battery modules. Because the accelerator sources current on rising edges, designers must validate that Smart Battery protocol timing and any sleep/wake signaling across the buffer behave correctly; the family datasheets provide application sections covering hot-insertion behavior and recommended pull-up values for each segment.
Recomendado
Networking Equipment Management Buses
Switches, routers, and optical transport gear use I2C/SMBus management buses spanning a chassis, connecting a management MCU to optical modules, temperature sensors, and power monitors distributed across several cards. The PCA9507 suits this topology because the 18 m rating exceeds chassis-scale wire runs, the 400 kHz rate supports fast polling, and level shifting between 3.3 V management planes and 5 V optics or fan trays removes discrete translation stages. Its bidirectional buffering preserves multi-master arbitration used by redundant management controllers. Segment each card or shelf with its own buffer rather than one buffer per chassis, and budget pull-up resistance per segment per NXP application guidance.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PCA9507 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PCA9517D,118 | PCA9617A | TCA9517DR |
|---|---|---|---|---|
| Package | SOIC-8 (8-SO) | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
| Level Shift | 3.3 V to 5 V | 1.0 V to 5.5 V (wider) | 2.3 V/3.3 V to 5 V selectable | 1.65 V to 5.5 V |
| Maximum Data Rate | 400 kHz | 400 kHz | 1 MHz (Fm+) | 400 kHz |
| Rise-Time Accelerator | Yes | Yes | Yes (adjustable) | Yes (accelerator outputs) |
| HDMI DDC Optimization | Yes (primary target) | General-purpose | General-purpose | General-purpose |
Diferenciadores clave
- HDMI DDC-optimized bus extension (frente a PCA9517D,118)
- Longer bus reach than non-accelerated buffers (frente a PCA9515AD,118)
- Wider low-voltage support in the alternative (frente a TCA9517DR)
Notas de diseño
Place the PCA9507 close to the cable or backplane connector it serves so that the long, capacitive segment sits on the accelerator-assisted side. Decouple the supply with a 100 nF ceramic capacitor directly at the VCC pin, plus a 1 uF bulk capacitor nearby. Keep SDA/SCL traces on the short segment as short and direct as possible; the long segment's edge shaping depends on the buffer seeing clean, low-capacitance connections on the controller side.
Pull-up resistor values must be calculated per segment, not globally. Each side of the PCA9507 forms an independent RC network: choose pull-ups so each segment meets I2C rise-time requirements at 400 kHz given that segment's capacitance. The internal accelerator sources additional current on rising edges but does not replace pull-ups. Estimated guideline: for a 3 m cable segment with roughly 300 pF capacitance, start around 1-2 kiloohm pull-ups and verify rise time on the bench, since the accelerator's dynamic drive changes effective edge behavior.
A common failure is assuming the buffer removes all bus-length limits: the 18 m rating assumes proper per-segment capacitance budgeting and termination. Do not daisy-chain multiple buffers without reviewing segment loading, and remember that level shift direction is fixed at 3.3 V to 5 V - connecting the sides backwards will prevent correct translation. Also verify HDMI HDCP timing with the added buffer delay in the DDC path before tape-out of display designs.
On long cable runs, route SDA and SCL as a modest-impedance pair with ground reference, and avoid running them adjacent to switching power or motor drive harnesses. The rise-time accelerator sharpens edges, which is beneficial for timing but means fast edges can couple into neighboring conductors; maintain spacing or add guard ground on flat-cable implementations. Scope both edges at the far-end device under full load to confirm duty cycle and noise margin.
Información de cumplimiento
Compliance data was not present in the provided web data. NXP orderable variant PCA9507D,118 suggests standard NXP lead-free/RoHS ordering suffix; confirm on the official NXP product page.
