A1229LUA-T

A1225/7/9 High Temperature Hall Effect Latches, Allegro MicrosystemsThe A1225/7/9 High Temperature Hall Effect Latches are temperature-stable and stress resistant suitable for operation for temperatures up to 150°C. A Schmitt trigger circuit maintains operate and release point symmetry by compensating for temperature changes in the Hall element. Internal compensation provides magnetic switchpoints that become more sensitive with temperature, hence offsetting the usual degradation of the magnetic field with temperature. The symmetry capability makes these devices ideal for use in pulse-counting applications where duty cycle is an important parameter. The three basic devices A1225, A1227, and A1229 are identical except for magnetic switchpoints. They also include a voltage regulator, Hall-voltage generator, temperature compensation circuit, signal amplifier, and a buffered open-drain output to sink up to 25 mA. The on-board regulator permits operation with supply voltages of 3.8 V to 24 V. The first character of the part number suffix determines the device operating temperature range. Suffix L is for –40°C to 150°C. Two package styles provide a magnetically optimised package for most applications. Available in a SOT89/TO-243AA package for surface-mount applications or three-lead ultra-mini-SIP. Symmetrical switchpoints Superior temperature stability Operation from unregulated supply Open-drain 25 mA output Reverse battery protection Activate with small, commercially available permanent magnets Resistant to physical stress Enhanced ESD structures result in 8 kV HBM ESD performance Internal protection circuits enable 40 V load dump compliance ### 霍尔效应传感器，Allegro Microsystems

A1225/7/9 高温霍尔效应闩锁，Allegro Microsystems

A1225/7/9 高温霍尔效应闩锁具有温度稳定和耐应力特点，适合高达 150°C 的操作温度。施密特触发器电路通过补偿霍尔元件的温度变化来维持操作和释放点对称。内部补偿提供磁性切换点，对温度更敏感，补偿温度对磁场造成的常见老化现象。

对称功能使这些设备特别适合在占空比至关重要的脉冲计数应用中使用。除磁性切换点外，三种基本设备（A1225、A1227 和 A1229）均相同。

它们还包括调压器、霍尔电压发生器、温度补偿电路、信号放大器和缓冲漏极开路输出，可连续吸收 25 mA。板载调压器支持 3.8 V 到 24 V 供电电压。

部件号后缀的第一个字符确定设备的工作温度范围。后缀 L 代表 –40°C 至 150°C。两种封装类型提供适合大多数应用的磁性优化封装。

采用表面安装应用 SOT89/TO-243AA 封装或三引线超微型 SIP。

对称切换点

卓越的温度稳定性

使用未调节电源操作

漏极开路 25 mA 输出

倒置电池保护

通过小商用永久磁铁激活

耐受物理应力

增强型 ESD 结构实现 8 kV HBM ESD 性能

内部保护电路满足 40 V 负载突卸合规性