PCA9557DB TI I2C I/O Expander | 16-SSOP | 8-bit, 400kHz

Product Overview

The PCA9557DB is a CMOS integrated circuit from Texas Instruments designed for I2C-bus controlled 8-bit I/O expansion. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface (serial clock SCL and serial data SDA). The device features an 8-bit quasi-bidirectional I/O port with high-current drive capability (up to 25 mA per pin) and low power consumption. Housed in a compact 16-SSOP package, it is ideal for space-constrained applications requiring additional I/O lines.

Detailed Technical Specifications

Key Features

• 8-bit I/O expander with I2C interface
• Three hardware address pins allow up to 8 devices on the same bus
• High-current drive capability (25 mA per pin)
• Low standby current (1 µA typical)
• Open-drain active-low interrupt output
• Power-on reset with no glitch on I/O pins
• 5 V tolerant I/O pins
• Operating supply voltage range: 2.3 V to 5.5 V

Target Applications

• 5G base station control and monitoring (e.g., antenna tilt, power management)
• Automotive dashboard switches and LED indicators
• Industrial PLC I/O expansion
• Server and networking equipment (e.g., fan control, status LEDs)
• Consumer electronics (e.g., smart home hubs, gaming consoles)

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for PCA9557DB. 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

PCA9557DB 是德州儀器（TI）生產的 CMOS 集成電路，專為 I2C 總線控制的 8 位 I/O 擴展而設計。它通過 I2C 接口（串行時鐘 SCL 和串行數據 SDA）為大多數微控制器系列提供通用遠程 I/O 擴展。該器件具有一個 8 位準雙向 I/O 端口，具有高電流驅動能力（每引腳高達 25 mA）和低功耗。採用緊湊的 16-SSOP 封裝，非常適合需要額外 I/O 線路的空間受限應用。

詳細技術參數

核心特性

• 8 位 I/O 擴展器，帶 I2C 接口
• 三個硬件地址引腳，允許同一總線上最多 8 個器件
• 高電流驅動能力（每引腳 25 mA）
• 低待機電流（典型值 1 µA）
• 開漏低電平有效中斷輸出
• 上電復位，I/O 引腳無毛刺
• 5 V 耐受 I/O 引腳
• 工作電源電壓範圍：2.3 V 至 5.5 V

典型應用場景

• 5G 基站控制與監控（例如天線傾角、電源管理）
• 汽車儀表板開關和 LED 指示燈
• 工業 PLC I/O 擴展
• 服務器和網絡設備（例如風扇控制、狀態 LED）
• 消費電子產品（例如智能家居中樞、遊戲主機）

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 PCA9557DB 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]