The Allegro
™
A1202 and A1203 Hall-effect bipolar switches
are next-generation replacements and extension of the popular
Allegro A3133 and A3132 bipolar switch product line. Overall,
the A120x family, produced with BiCMOS technology, consists
of continuous-time devices that feature 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.
The A120x Hall-effect bipolar switches include 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. All devices
in the family are identical, except for magnetic switchpoints.
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 UA is a three-lead
ultramini SIP for through-hole mounting. Each package is lead
(Pb) free, with 100% matte-tin-plated leadframes.
A1202-DS, Rev. 24
MCO-0000372
• AEC-Q100 automotive qualified
• 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
Continuous-Time Bipolar Switch Family
Functional Block Diagram
A1202 and A1203
FEATURES AND BENEFITS DESCRIPTION
PACKAGES:
Not to scale
3-pin SOT23W
(suffix LH)
3-pin SIP,
matrix HD style
(suffix UA)
3-pin SIP,
chopper style
(suffix UA)
NOT FOR NOT FOR
NEW DESIGNNEW DESIGN
July 21, 2022
Amp
Regulator
GND
VCC
VOUT
OffsetGain
Trim
Control
To all subcircuits
Continuous-Time Bipolar Switch Family
A1202
and A1203
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
SELECTION GUIDE
Part Number Packing
[1]
Mounting Ambient, T
A
B
RP
(Min) B
OP
(Max)
A1202LUA-T
[2]
Bulk, 500 pieces/bag 3-pin SIP through hole –40°C to 150°C –75 75
A1203EUA-T
[2]
Bulk, 500 pieces/bag 3-pin SIP through hole –40°C to 85°C
–95 95
A1203LLHLT-T 7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount
–40°C to 150°CA1203LLHLX-T 13-in. reel, 10000 pieces/reel 3-pin SOT23W surface mount
A1203LUA-T
[2]
Bulk, 500 pieces/bag 3-pin SIP through hole
[1]
Contact Allegro for additional packing options.
[2]
The chopper-style UA package is not for new design; the matrix HD style UA package is recommended for new designs.
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Notes Rating Units
Supply Voltage V
CC
30 V
Reverse Supply Voltage V
RCC
–30 V
Output Off Voltage V
OUT
30 V
Reverse Output Voltage V
ROUT
–0.5 V
Output Current Sink I
OUTSINK
25 mA
Magnetic Flux Density B Unlimited G
Operating Ambient Temperature T
A
Range E –40 to 85 °C
Range L –40 to 150 °C
Maximum Junction Temperature T
J
(max) 165 °C
Storage Temperature T
stg
–65 to 170 °C
Terminal List
Number
Name Description
Package LH Package UA
1 1 VCC Connects power supply to chip
2 3 VOUT Output from circuit
3 2 GND Ground
1
3
2
GND
VOUT
VCC
Package UAPackage LH
1
2
3
GND
VOUT
VCC
Continuous-Time Bipolar Switch Family
A1202
and A1203
3
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
OPERATING CHARACTERISTICS: over full operating voltage and ambient temperature ranges,
unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ. Max. Units
ELECTRICAL CHARACTERISTICS
Supply Voltage
[1]
V
CC
Operating, T
J
< 165°C 3.8 – 24 V
Output Leakage Current I
OUTOFF
V
OUT
= 24 V, B < B
RP
– – 10 µA
Output On Voltage V
OUT(SAT)
I
OUT
= 20 mA, B > B
OP
– 215 400 mV
Power-On Time
[2]
t
PO
Slew rate (dV
CC
/dt) < 2.5 V/μs, B > B
OP
(max) + 5 G or
B < B
RP
(min) – 5 G
– – 4 µs
Output Rise Time
[3]
t
r
V
CC
= 12 V, R
LOAD
= 820 Ω, C
S
= 12 pF – – 2 µs
Output Fall Time
[3]
t
f
V
CC
= 12 V, R
LOAD
= 820 Ω, C
S
= 12 pF – – 2 µs
Supply Current
I
CCON
B > B
OP
– 3.8 7.5 mA
I
CCOFF
B < B
RP
– 3.5 7.5 mA
Reverse Battery Current I
RCC
V
RCC
= –30 V – – –10 mA
Supply Zener Clamp Voltage V
Z
I
CC
= 30 mA; T
A
= 25°C 32 – – V
Supply Zener Current
[4]
I
Z
V
Z
= 32 V; T
A
= 25°C
– – 30 mA
MAGNETIC CHARACTERISTICS
[5]
Operate Point B
OP
A1202 – 26 75 G
A1203 – 26 95 G
Release Point B
RP
A1202 –75 –26 – G
A1203 –95 –26 – G
Hysteresis B
HYS
A1202 30 52 – G
A1203 30 52 – G
[1]
Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section.
[2]
For V
CC
slew rates greater than 250 V/μs, and T
A
= 150°C, the Power-On Time can reach its maximum value.
[3]
C
S
=oscilloscope probe capacitance.
[4]
Maximum current limit is equal to the maximum I
CC(max)
+ 22 mA.
[5]
Magnetic ux density, B, is indicated as a negative value for north-polarity magnetic elds, and as a positive value for south-polarity magnetic elds. This so-called alge-
braic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the eld is indicated by the absolute value of B, and the
sign indicates the polarity of the eld (for example, a –100 G eld and a 100 G eld have equivalent strength, but opposite polarity).
DEVICE QUALIFICATION PROGRAM
Contact Allegro for information.
EMC (ELECTROMAGNETIC COMPATABILITY) REQUIREMENTS
Contact Allegro for information.
