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A1205
Continuous-Time Bipolar Switch
Features and Benefits
▪ Ideal for applications that require pulsing VCC to
conserve power
▪ 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:
Description
The Allegro® A1205 Hall-effect bipolar switch is a next-
generation replacement and extension of the popular Allegro
A3134 bipolar switch. The A1205 has identical specifications
as the A1201 but is recommended for applications that require
pulsing VCC to conserve power. For standard applications,
where VCC is constant, please refer to the A1201 through
A1204 devices.
Overall, theA120x 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.
TheA120x Hall-effect bipolar switches include the following on
a single silicon chip: voltage regulator, Hall-voltage generator,
3 pin SOT23W (LH)
www.DataSheet4U.com
Not to scale
3 pin SIP (UA)
Continued on the next page…
Functional Block Diagram
VCC
A1205-DS, Rev. 1
Regulator
To all subcircuits
Amp
Gain
Offset
Trim
Control
VOUT
GND

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A1205
Continuous-Time Bipolar Switch
Description (continued)
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 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 miniature thin-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
Packing*
A1205ELHLT-T 7-in. reel, 3000 pieces/reel
A1205EUA-T
Bulk, 500 pieces/bag
A1205LLHLT-T 7-in. reel, 3000 pieces/reel
A1205LUA-T
Bulk, 500 pieces/bag
*Contact Allegro for additional packing options.
Mounting
3-pin SOT23W surface mount
3-pin SIP through hole
3-pin SOT23W surface mount
3-pin SIP through hole
Ambient, TA
–40ºC to 85ºC
–40ºC to 150ºC
BRP (Min)
–50
BOP (Max)
50
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Off Voltage
Reverse Output Voltage
Output Current Sink
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
VOUT
VROUT
IOUTSINK
B
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
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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A1205
Continuous-Time Bipolar Switch
OPERATING CHARACTERISTICS over full operating voltage and ambient temperature ranges, unless otherwise noted
Characteristic
Electrical Characteristics
Supply Voltage1
Output Leakage Current
Output On Voltage
Power-On Time2
Output Rise Time3
Output Fall Time3
Supply Current
Reverse Battery Current
Supply Zener Clamp Voltage
Supply Zener Current
Magnetic Characteristics4
Symbol
Test Conditions
VCC
IOUTOFF
VOUT(SAT)
tPO
tr
tf
ICCON
ICCOFF
IRCC
VZ
IZ
Operating, TJ < 165°C
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
Slew rate (dVCC/dt) < 2.5 V/μs, B > BOP + 5 G or
B < BRP – 5 G
VCC = 12 V, RLOAD = 820 Ω, CS = 12 pF
VCC = 12 V, RLOAD = 820 Ω, CS = 12 pF
B > BOP
B < BRP
VRCC = –30 V
ICC = 30 mA; TA = 25°C
VZ = 32 V; TA = 25°C
Min. Typ. Max. Units
3.8 – 24 V
– – 10 µA
– 215 400 mV
– – 4 µs
– – 2 µs
– – 2 µs
– 3.8 7.5 mA
– 3.5 7.5 mA
– – –10 mA
32 – 40 V
– – 30 mA
Operate Point
BOP South pole adjacent to branded face of device
–40 15
50
G
Release Point
BRP North pole adjacent to branded face of device
–50 –15 40
G
Hysteresis
BHYS
BOP – BRP
5 30 55 G
1 Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section.
2 For VCC slew rates greater than 2.5 V/μs, and TA = 150°C, the Power-On Time can reach its maximum value.
3 CS =oscilloscope probe capacitance.
4 Magnetic flux density, B, is indicated as a negative value for north-polarity magnetic fields, and as a positive value for south-polarity magnetic fields.
This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the field is indicated
by the absolute value of B, and the sign indicates the polarity of the field (for example, a –100 G field and a 100 G field have equivalent strength, but
opposite polarity). Reference to the magnetic field polarity is with respect to the beveled face of the device.
DEVICE QUALIFICATION PROGRAM
Contact Allegro for information.
EMC (Electromagnetic Compatibility) REQUIREMENTS
Contact Allegro for information.
Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com