wafer fabrication processing takes advantage of low-voltage
requirements, component matching, very low input-offset
errors, and small component geometries.
The A3230 Hall-effect bipolar switch turns on in a south
polarity magnetic field of sufficient strength and switches
off in a north polarity magnetic field of sufficient strength.
Because the output state is not defined if the magnetic field is
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Continued on the next page…
Not to scale
Functional Block Diagram
VCC
Regulator
To All Subcircuits
Sample and Hold
Dynamic Offset
Cancellation
Low-Pass
Filter
VOUT
Amp
Control
Current Limit
<1Ω
GND
3230-DS, Rev. 2
A3230
Chopper-Stabilized Hall Effect Bipolar Switch
for the L temperature range.
Two A3230 package styles provide
magnetically optimized solutions for most applications. Package
LH is a SOT23-W, a miniature low-profile surface-mount
package, while package UA is a three-lead ultramini SIP for
through-hole mounting. Each package is available in a lead (Pb)
free version, with 100% matte tin plated leadframes.
Description (continued)
diminished or removed, to ensure that the device switches, Allegro
recommends using magnets of both polarities and of sufficient
strength in the application.
The A3230 is rated for operation between the ambient temperatures
–40°C and 85°C for the E temperature range, and –40°C to 150°C
Selection Guide
Part Number
A3230ELHLT-T
A3230EUA-T
A3230LLHLT-T
A3230LUA-T
1
Pb-based
Pb-free
1
Yes
Yes
Yes
Yes
Packing
2
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Mounting
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SIP through hole
Ambient, T
A
(°C)
–40 to 85
B
RP(MIN)
(G)
–25
B
OP(MAX)
(G)
25
–40 to 150
variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN.
This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications
because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A3230ELHLT, A3230EUA,
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