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Allegro MicroSystems

A1201 Datasheet Preview

A1201 Datasheet

Continuous-Time Bipolar Switch

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A1201
Continuous-Time Bipolar Switch
FEATURES AND BENEFITS
▪ Continuous-time operation
▫ Fast power-on time
▫ Low noise
▪ Stable operation over full operating temperature range
▪ Reverse battery protection
▪ Solid-state reliability
▪ Factory-programmed at end-of-line for optimum
performance
▪ Robust EMC performance
▪ High ESD rating
▪ Regulator stability without a bypass capacitor
PACKAGES:
Not to scale
3-pin SOT23W
(suffix LH)
NOT FOR
NEW DESIGN
3-pin SIP,
matrix HD style
(suffix UA)
3-pin SIP,
chopper style
(suffix UA)
DESCRIPTION
The Allegro A1201 Hall-effect bipolar switch is a next-
generation replacement and extension of the popular Allegro
A3134 bipolar switch. Overall, the A1201, produced with
BiCMOS technology, is a continuous-time device that
features fast power-on time and low-noise operation. Device
programming is performed after packaging, to ensure increased
switchpoint accuracy by eliminating offsets that can be induced
by package stress. Unique Hall element geometries and low-
offset amplifiers help to minimize noise and to reduce the
residual offset voltage normally caused by device overmolding,
temperature excursions, and thermal stress.
TheA1201 Hall-effect bipolar switch includes the following on
a single silicon chip: voltage regulator, Hall-voltage generator,
small-signal amplifier, Schmitt trigger, and NMOS output
transistor. The integrated voltage regulator permits operation
from 3.8 to 24 V. The extensive on-board protection circuitry
makes possible a ±30 V absolute maximum voltage rating for
superior protection in automotive and motor commutation
applications, without adding external components. The device
is a member of the A1201 product family which has identical
electrical characteristics throughout, but provides a range of
magnetic switchpoints.
Continued on the next page…
VCC
A1201-DS, Rev. 15
Functional Block Diagram
Regulator
To all subcircuits
Amp
Gain
Offset
Trim
Control
VOUT
GND
November 4, 2016




Allegro MicroSystems

A1201 Datasheet Preview

A1201 Datasheet

Continuous-Time Bipolar Switch

No Preview Available !

A1201
Continuous-Time Bipolar Switch
DESCRIPTION (CONTINUED)
The small geometries of the BiCMOS process allow these devices
to be provided in ultrasmall packages. The package styles available
provide magnetically optimized solutions for most applications.
Package LH is a SOT23W, a miniature low-profile surface-mount
package, while package UAis a three-lead ultramini SIPfor through-
hole mounting. Each package is lead (Pb) free, with 100% matte
tin plated leadframes.
SELECTION GUIDE
Part Number
A1201ELHLT-T [2]
A1201EUA-T [2][3]
A1201LLHLT-T [2]
A1201LUA-T [2][3]
Packing [1]
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, TA (°C) BRP (Min) (G)
–40 to 85
–40 to 150
–50
1 Contact Allegro for additional packing options.
2 Variant is obsolete.
3 The chopper-style UA package is not for new design; the matrix HD style UA package is recommended for new designs.
BOP (Max) (G)
50
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Supply Voltage
Reverse Supply Voltage
Output Off Voltage
Reverse Output Voltage
Output Current Sink
Magnetic Flux Density
VCC
VRCC
VOUT
VROUT
IOUTSINK
B
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
TA
TJ(max)
Tstg
Range E
Range L
Notes
Rating
30
–30
30
–0.5
25
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
V
V
mA
G
°C
°C
°C
°C
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A1201
Description Continuous-Time Bipolar Switch
Maker Allegro MicroSystems
Total Page 15 Pages
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