WMSIC Electronic Components

74VHCT244AFT(BJ) 74VHCT244AFT

Model74VHCT244AFT(BJ)
PackageTSSOP20B
BrandTOSHIBA
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 23+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
TOSHIBA 74VHCT244AFT(BJ)
Type
TOSHIBA
Minimum package
2500 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
TOSHIBA
Electronic Component
74VHCT244AFT(BJ)
Electronic Component
1
Package
TSSOP20B
Electronic Component
Buffers / Drivers / Transceivers
Electronic Component
74VHCT
Electronic Component
0.155g
Electronic Component
1
Electronic Component
1
Features
Isolated; Output; Level Conversion
Electronic Component
BM0265061391
Operating Temperature
40℃~+125℃
Operating Voltage
4.5V~5.5V
Output Type
Electronic Component
Type
Electronic Component

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

74VHCT244AFT(BJ) 产品概述

一、概述

74VHCT244AFT(BJ) 为东芝(TOSHIBA)出品的高性能八位缓冲/驱动器,封装为 TSSOP-20B。器件属于 74VHCT 系列,工作电压 4.5V ~ 5.5V,采用三态输出设计并具备掉电隔离特性,专为 5V 系统的总线驱动、信号整形与电平转换应用而设计。

二、主要规格亮点

  • 输出类型:三态(可实现总线仲裁与多主系统共享)
  • 元件数/位宽:1 个元件,8 位(八路)
  • 通道类型:双向(支持双向数据流控制)
  • 电源电压:VCC = 4.5V~5.5V(典型 5V 应用)
  • 驱动能力:IOL = 8 mA / IOH = 8 mA(典型电流驱动能力)
  • 静态电流:Iq ≈ 80 μA(低静态功耗,有利于节能设计)
  • 传播延迟:tpd = 5.9 ns @ 5V, CL = 50 pF(高速响应,适合中高速总线)
  • 工作温度:-40 ℃ ~ +125 ℃(工业级温度范围)
  • 功能特性:掉电隔离(Ioff)、输出使能(OE)、电平转换兼容性
  • 封装:TSSOP-20B(紧凑型表贴)

三、功能与应用场景

74VHCT244AFT(BJ) 为多用途缓冲/驱动器,可用于:

  • 总线隔离与多主共享总线控制(利用三态输出与 OE)
  • 片间/板间电平匹配(VHCT 系列对 TTL/3.3V 输出有良好兼容性)
  • 地址/数据总线驱动、外设接口缓冲、信号整形与防止反向馈电(掉电隔离)
  • 工业控制、通信设备、嵌入式主控与外设接口电路

四、设计与使用建议

  • 电源旁路:在 VCC 近端放置 0.1 μF 贴片陶瓷旁路电容,抑制瞬态噪声并保持信号完整性。
  • 输出使能(OE)管理:将 OE 信号与控制逻辑或片选信号配合使用,避免多个设备同时驱动总线导致短路电流。
  • 热与电流限制:单片驱动电流受限(IOx = 8 mA),并考虑同时多路输出导通时的总功耗与封装热耗散。
  • 掉电隔离(Ioff):当 VCC 关闭或低于工作阈值时,器件可防止反向电流进入未上电系统,利于分区供电与热插拔设计。
  • 布线注意:长总线应考虑匹配阻抗与去耦,减小寄生电容(CL)以保持声明的传播延迟性能。

五、选型要点

在选择时确认:

  • 系统供电为 5V 及其可靠性与噪声裕量;若用于 3.3V 系统需确认上游输出满足 VHCT 的 VIH 要求以保证电平识别可靠。
  • 负载电流与驱动能力是否满足负载容量(LED、继电器驱动需外接驱动或扩大器件)。
  • 工作温度与封装散热是否满足工业环境要求。

本器件凭借低静态功耗、三态输出与掉电隔离等特性,适合用于需要可靠总线管理、稳健电平兼容与工业级环境下的缓冲与驱动应用。若需更详细的脚位定义、绝对最大额定值与时序图,请参考东芝原厂数据手册或联系供应商获取完整规格说明。

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