A1227LUA-T Allegro Microsystems, Bipolar Hall Effect Sensor, 3-Pin SIP

Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
Product Details

A1225/7/9 High Temperature Hall Effect Latches, Allegro Microsystems

The 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

Hall Effect Sensors, Allegro MicroSystems

Attribute Value
Magnetic Type Bipolar
Mounting Type Through Hole
Pin Count 3
Minimum Magnetic Sensor Release Point -175 Gs
Maximum Magnetic Sensor Operating Point 175 Gs
Minimum Operating Supply Voltage 3.8 V
Maximum Operating Supply Voltage 24 V
Length 4.09mm
Width 1.52mm
Height 3.02mm
Dimensions 4.09 x 1.52 x 3.02mm
Minimum Operating Temperature -40 °C
Maximum Operating Temperature +150 °C
Package Type SIP
Typical Magnetic Sensor Hysteresis 350 (Maximum) Gs
30 In stock for delivery within 4 working days
Price Each (In a Pack of 5)
SGD 2.73
(exc. GST)
SGD 2.92
(inc. GST)
Per unit
Per Pack*
5 - 20
25 - 95
100 - 245
250 - 495
500 +
*price indicative
Packaging Options:
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