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PCA9518PW

Name: PCA9518PW
Rating: 4.7 (12 reviews)

IC INTERFACE SPECIALIZED 20TSSOP

製造商
製造商。部分 #PCA9518PW
包 20-TSSOP (0.173, 4.40mm Width)
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規格

Supplier	Texas Instruments
Package	Tube
ProductStatus	Active
Applications	Buffer
Interface	I²C
Voltage-Supply	3V ~ 3.6V
Package/Case	20-TSSOP (0.173, 4.40mm Width)
SupplierDevicePackage	20-TSSOP

概述

Description

PCA9518PW is an NXP I2C-bus buffer/repeater designed to extend and isolate I2C buses. It provides two bidirectional channels that buffer signals between two bus segments, enabling different supply voltages on each side (voltage-domain isolation) and reducing the load from bus capacitance and noise. This helps cascade I2C segments, level-shift between 3.3 V and 5 V devices, and improve signal integrity over longer runs. The device preserves standard/fast-mode I2C timing, uses open-drain signaling, and typically offers enable/disable control for each channel. It comes in a PW package (plastic package). Suitable applications include multi-segment I2C systems, mixed-voltage designs, and long-distance I2C connections. For exact electrical characteristics, pinout, speed support, and timing figures, consult the PCA9518PW datasheet.

Features

PCA9518PW is a 2-channel I2C-bus repeater/buffer with level shifting between two I2C bus segments. Key features:
- Two bidirectional buffers (channels A and B) that translate between two supply domains (VCCA and VCCB)
- Enables I2C communication across voltage domains and/or long distances or high-capacitance buses
- Preserves I2C protocol: arbitration and clock stretching remain intact
- EN input to disable both channels for fault protection or hot-swap
- Requires pull-ups on both sides; open-drain I2C interface
- Suitable for isolating and protecting devices on each segment and reducing loading on the master
- Low quiescent current with basic ESD protection
- Package: PW (20-pin small-outline/NXP packaging)
Note: For exact electrical limits, voltages, jump/enable behavior, and timing, please refer to the PCA9518PW datasheet.

Package

The PCA9518PW is in a 16‑pin plastic surface‑mount package (SOIC‑16).

Pinout

- Pin count: 8 pins (PCA9518PW, in an 8-pin package)
- Function: I2C-bus buffer/repeater. It isolates/buffers the I2C SDA/SCL lines to extend bus length or level-shift between sections, with an enable control.

Manufacturer

Manufacturer: NXP Semiconductors.
What kind of company: A Dutch multinational semiconductor company that designs and manufactures integrated circuits and microchips for automotive, industrial, and consumer electronics (originated as Philips Semiconductors).

Application

Applications of PCA9518PW include:
- Level shifting between I2C devices at different voltages (e.g., 3.3V to 5V)
- Buffering/repeating to extend bus length and reduce capacitive loading
- Fan-out expansion to drive multiple slaves with preserved signal integrity
- Segmentation of noisy or high‑drain sections for EMI/noise isolation
- Multi-bus I2C architectures in automotive, industrial, and consumer electronics
- Sensor networks and microcontroller peripherals needing fault isolation and protection

Equivalent

Equivalent parts for PCA9518PW (8-channel I2C-bus buffer/level shifter):
- TI TCA9517A / TCA9518A
- NXP P82B96
- NXP P82B715
Note: check I/O voltage, channel count, speed, and package to ensure a drop-in replacement.