A1225, A1227, and A1229: Hall-Effect Latch for High Temperature Operation

These Hall-effect latches are extremely temperature-stable and stress resistant sensor ICs especially suited for operation over extended temperature ranges to 150°C. Superior hightemperature performance is made possible through a novel Schmitt trigger circuit that maintains operate and release point symmetry by compensating for temperature changes in the Hall element. Additionally, 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.

Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, temperature compensation circuit, signal amplifier, Schmitt trigger, and a buffered open-drain output to sink up to 25 mA. The on-board regulator permits operation with supply voltages of 3.8 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 optimized package for most applications. Suffix LT is a miniature SOT89/TO-243AA transistor package for surface-mount applications, suffix UA is a three-lead ultra-mini-SIP. Both packages are lead (Pb) free with 100% matte tin leadframe plating.

The A1225, A1227, and A1229 LT package variants are in production but has been determined to be not for new design. This classification indicates that sale of this device is currently restricted to existing customer applications. These devices should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Recommended replacement: A1225, A1227, or A1229 LH package variants.

SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

RECEIVE PRODUCT ALERTS
We'll notify you when there are updates to this product. Sign Up
  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Symmetrical switchpoints
  • Superior temperature stability
  • Operation from unregulated supply
  • Open-drain 25 mA output
  • Reverse battery protection
  • Activate with small, commercially available permanent magnets
  • Solid-state reliability
  • Small size
  • Resistant to physical stress
  • Enhanced ESD structures result in 8 kV HBM ESD performance without external protection components
  • Internal protection circuits enable 40 V load dump compliance without external protection components

Packages

There are no news items available for this product.

Click the image to view larger
Product Image Functional Block Diagram

Part Number Specifications and Availability

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

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Copyright © 2017 Allegro MicroSystems, LLC

Sitemap  |  Privacy Policy  |  Contact Webmaster

Follow us on: LinkedIn YouTube Google+ Follow Allegro on Twitter

Careers   |   Contact Sales   |   Home   |   Legal   |   Quality & Environment   |   Request Samples