PCA9557D TI I2C GPIO Expander | 16-SOIC | 8-bit, 400kHz

Product Overview

The PCA9557D is a 8-bit I2C-bus and SMBus I/O expander from Texas Instruments. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface. The device features an 8-bit quasi-bidirectional I/O port, with each pin individually configurable as input or output. The PCA9557D operates from a 2.3V to 5.5V supply and supports up to 400kHz I2C clock frequency. It is available in a 16-pin SOIC package, making it suitable for space-constrained applications.

Detailed Technical Specifications

Key Features

• 8-bit quasi-bidirectional I/O port
• I2C-bus interface with 3 address pins (up to 8 devices)
• Low standby current consumption
• Open-drain active-low interrupt output
• Power-on reset with all channels set as inputs
• No glitch on power-up
• Compatible with SMBus

Target Applications

• 5G base station: control and status monitoring of RF modules
• Automotive dashboard: reading switch inputs and controlling LEDs
• Industrial PLC: expansion of digital I/O for sensor/actuator interface
• Server/telecom equipment: fan speed control and fault detection
• Consumer electronics: GPIO expansion for smart home devices

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for PCA9557D. Our core advantages include:

• 24/7 Global Customer Support: Professional team providing instant quotes and technical support worldwide.
• In-stock Inventory, Same-day Shipping: We maintain localized stock; orders confirmed before 4 PM are shipped the same day.
• HK-SZ Synergy, Flexible Settlement: Direct global shipping from Shenzhen with support for HK bank transfers and multi-currency.
• Escrow Secured Transactions: We support Escrow.com for secure transactions, ensuring peace of mind for batch orders.
• BOM Kitting & Sampling Services: Specialized sourcing for testing samples and urgent shortage components.

Quality Assurance & Compliance

Jasin Chip guarantees that all delivered products are 100% original factory stock with full quality assurance and traceability.

• 100% Original & Authentic: All components are guaranteed to be authentic with strict quality control.
• RoHS Compliant: All electronic components comply with international environmental and safety standards.
• Original Factory Packaging: We maintain original factory packaging and seals to ensure ESD protection and physical integrity.

產品概述

PCA9557D 是德州儀器 (TI) 的一款 8 位 I2C 匯流排和 SMBus I/O 擴展器。它通過 I2C 介面為大多數微控制器系列提供通用遠端 I/O 擴展。該器件具有一個 8 位準雙向 I/O 埠，每個引腳可單獨配置為輸入或輸出。PCA9557D 的工作電壓範圍為 2.3V 至 5.5V，支援高達 400kHz 的 I2C 時鐘頻率。它採用 16 引腳 SOIC 封裝，適合空間受限的應用。

詳細技術參數

核心特性

• 8 位準雙向 I/O 埠
• I2C 匯流排介面，帶 3 個位址引腳（最多 8 個器件）
• 低待機電流消耗
• 開漏極低電平有效中斷輸出
• 上電復位，所有通道設為輸入
• 上電無突波
• 與 SMBus 相容

典型應用場景

• 5G 基站：射頻模組的控制和狀態監控
• 汽車儀表板：讀取開關輸入和控制 LED
• 工業 PLC：擴展數位 I/O 用於感測器/執行器介面
• 伺服器/電信設備：風扇速度控制和故障檢測
• 消費電子：智慧家居設備的 GPIO 擴展

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 PCA9557D 提供全面的供應鏈與批發解決方案。 我們的核心優勢包括：

• 全天候環球客戶支援：專業團隊為您提供即時報價及技術支援，無需漫長等待。
• 現貨庫存，即日發貨：確保現貨充足。下午 4 點前確認訂單，即可安排當天寄出。
• 深港聯動，結算靈活：深圳直發全球，物流高效可靠；支援香港銀行戶口轉賬及多幣種結算。
• Escrow 擔保交易：支援 Escrow.com 平台交易，保障買賣雙方權益，小批量訂單亦可安心在線下單。
• BOM 配單與樣板服務：提供樣板測試及認證支援。專注一站式 BOM 配套及緊急缺料採購服務。

品質保證與合規

Jasin Chip 承諾所有出貨產品均為原廠正貨，具備完善的品質保證及產品可追溯性。

• 100% 原廠正貨：承諾所有供應零件均為原裝現貨，品質嚴格把關，來源清晰可追溯。
• 符合 RoHS 認證：所有電子元器件均符合國際環保標準及相關安全認證。
• 原廠封裝保護：嚴格保留原廠原始包裝及封條，確保物流過程中的靜電防護 (ESD) 與物理安全。

以上產品均為原廠正貨，提供 BOM 配單及現貨庫存支援，歡迎查詢。

HONG KONG JASIN SEMICONDUCTOR TECHNOLOGY COMPANY LIMITED
Trusted Partner for Automotive, Industrial, and Hard-to-find Components.
WhatsApp: +852 5209 9691 | Email: [email protected]