Quality Standards and Environmental Certifications

A1225、A1227 和 A1229：适合高温工作的霍尔效应锁存器

A1225、A1227、A1229 数据表
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Description

这些霍尔效应锁存器是极端温度稳定和耐应力传感器 IC，特别适合扩展温度范围（最高 150°C）的工作条件。通过创新施密特触发器电路可以实现卓越的温度性能，该触发器电路通过补偿霍尔元件的温度变化来保持工作和释放点对称。此外，内部补偿可以提供对温度更敏感的磁性开关点，因此，抵消了温度导致的磁场性能降低。对称功能使这些器件成为占空比是重要参数的脉冲计数应用的理想选择。除磁性开关以外，三个基本器件（A1225、A1227 和 A1229）完全相同。

每个器件在单硅片上装有以下元件：稳压器、霍尔电压发生器、温度补偿电路、单放大器、施密特触发器，以及带短路保护的开漏极输出（最大灌电流 25 mA）。板载稳压器允许使用 3.8 到 24V 的电源电压进行操作。

器件编号后缀的第一个字符决定器件工作温度范围。后缀L表示-40°C至150°C。两种封装类型都能为大多数应用提供磁性优化的封装。后缀 LT 表示微型 SOT89/TO-243AA 晶体管封装，适合表面安装应用；后缀 UA 表示三管脚超小型 SIP。两种封装均为无铅封装，采用 100% 雾锡电镀引脚框。

A1225、A1227 和 A1229 LT 封装变体正在生产中，但已确定不是新设计。该分类表示此器件的销售目前仅限于现有客户应用。这些器件不应该用于新设计应用，因为在不久的将来，它很可能过时。不再提供样品。推荐的代替产品：A1225、A1227 或 A1229 LH 封衍生产品。

Top Features

  • 对称的开关点
  • 非凡的温度稳定性
  • 能以未稳压电源运行
  • 开漏极 25 mA 输出
  • 电池反接保护
  • 利用市场有售的小磁铁激活
  • 固态可靠性
  • 小尺寸
  • 对物理应力不敏感
  • 增强 ESD 结构实现 8 kV HBM ESD 性能，并且不使用外部保护组件
  • 内部保护电路可以实现 40 V 负载突降合规，并且不使用外部保护组件
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Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant		 Part Composition /
RoHS数据		 Comments Samples Check Stock
A1225LLTTK-T 3-lead SOT -40°C to 150°C Yes View Data Last time buy Contact your
local sales rep		 Check
Distributor Stock
A1225LLTTR-T 3-lead SOT -40°C to 150°C Yes View Data Last time buy Contact your
local sales rep		 Check
Distributor Stock
A1225LUA-T 3-lead SIP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep		 Check
Distributor Stock
A1227LLTTK-T 3-lead SOT -40°C to 150°C Yes View Data Last time buy Contact your
local sales rep		 Check
Distributor Stock
A1227LLTTR-T 3-lead SOT -40°C to 150°C Yes View Data Last time buy Contact your
local sales rep		 Check
Distributor Stock
A1227LUA-T 3-lead SIP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep		 Check
Distributor Stock
A1229LLTTK-T 3-lead SOT -40°C to 150°C Yes View Data Last time buy Contact your
local sales rep		 Check
Distributor Stock
A1229LLTTR-T 3-lead SOT -40°C to 150°C Yes View Data Last time buy Contact your
local sales rep		 Check
Distributor Stock
A1229LUA-T 3-lead SIP -40°C to 150°C Yes View Data Not for new design Contact your
local sales rep		 Check
Distributor Stock

Allegro 的产品不允许在任何由于 Allegro 产品的合理故障造成人身伤害的装置或系统中使用，包括但不限于生命支持装置或系统。

Packaging

两种封装类型都能为大多数应用提供磁性优化的封装。后缀 LT 表示微型 SOT89/TO-243AA 晶体管封装，适合表面安装应用；后缀 UA 表示三管脚超小型 SIP。两种封装均为无铅封装，采用 100% 雾锡电镀引脚框。

封装

见解和创新

Semiconductors (general)

Hall-Effect IC Applications Guide

Allegro MicroSystems uses the latest integrated circuit technology in combination with the century-old Hall effect to produce Hall-effect ICs. These are contactless, magnetically activated switches and sensor ICs with the potential to simplify and improve electrical and mechanical systems.

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Semiconductors (general)

Soldering Methods for Allegro Products (SMD and Through-Hole)

AN29006 - This document describes typical soldering methods that have been proven effective with Allegro™ products. It provides information on SMD (surface mount devices) and through-hole packages. Both lead (Pb) free and traditional Pb-based technologies are examined.

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Packaging

Guidelines for Designing Subassemblies Using Hall-Effect Devices

This document covers most of the assembly methods used for mounting Hall-effect devices. In Allegro® Hall-effect devices, the signal is conditioned and optimized for various types of magnetic inputs to produce a suitable electrical output.

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Semiconductors (general)

Handling, Storage, and Shelf Life of Semiconductor Devices

Electronic devices are available in many package types and can contain semiconductors (integrated circuits), magnets, capacitors, and resistors. This application note provides guidelines for the handling and storage of Allegro devices with regards to functionality and shelf life. Precautions ...

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Packaging

Allegro Microsystems - Chemical Exposure of Devices

This application note discusses the types of situations and applications that can give rise to failure of the device from corrosion.

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Semiconductors (general)

Allegro Hall-Effect Sensor ICs

This note provides a basic understanding of the Hall effect and how Allegro designs and implements Hall technology in packaged semiconductor monolithic integrated circuits.

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Switch and Latch

Latching Switch Hall-Effect IC Basics

There are four general categories of Hall-effect IC devices that provide a digital output: unipolar switches, bipolar switches, omnipolar switches, and latches. Latching Hall-effect sensor ICs, often referred to as "latches," are digital output Hall-effect switches that latch output states.

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