A1205LUA-T Allegro Microsystems Inc, A1205LUA-T Datasheet

HALL EFFECT BIPOLAR SWITCH

A1205LUA-T

Manufacturer Part Number
A1205LUA-T
Description
HALL EFFECT BIPOLAR SWITCH
Manufacturer
Allegro Microsystems Inc
Type
Bipolar Latchr
Datasheet

Specifications of A1205LUA-T

Rohs Compliant
YES
Sensing Range
50G Trip, -50G Release
Voltage - Supply
3.8 V ~ 24 V
Current - Supply
7.5mA
Current - Output (max)
25mA
Output Type
Digital, Open Drain
Operating Temperature
-40°C ~ 150°C
Package / Case
3-SIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A1205LUA-T
Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
Features and Benefits
▪ Ideal for applications that require pulsing V
▪ Continuous-time operation
▪ Stable operation over full operating temperature range
▪ Reverse battery protection
▪ Solid-state reliability
▪ Factory-programmed at end-of-line for optimum
▪ Robust EMC performance
▪ High ESD rating
▪ Regulator stability without a bypass capacitor
Packages:
Not to scale
A12051-DS, Rev. 6
3 pin SOT23W (LH)
conserve power
performance
▫ Fast power-on time
▫ Low noise
VCC
3 pin SIP (UA)
Regulator
Functional Block Diagram
CC
to
Gain
Amp
Continuous-Time Bipolar Switch
To all subcircuits
Control
Trim
Description
The Allegro
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 V
where V
A1204 devices.
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
Continued on the next page…
Offset
CC
CC
®
is constant, please refer to the A1201 through
to conserve power. For standard applications,
A1205 Hall-effect bipolar switch is a next-
GND
VOUT
A1205

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A1205LUA-T Summary of contents

Page 1

Features and Benefits ▪ Ideal for applications that require pulsing V 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 ...

Page 2

... The small geometries of the BiCMOS process allow these devices to be provided in ultrasmall packages. The package styles available Selection Guide Part Number Packing* A1205LLHLT-T 7-in. reel, 3000 pieces/reel A1205LUA-T Bulk, 500 pieces/bag *Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Supply Voltage Reverse Supply Voltage ...

Page 3

A1205 OPERATING CHARACTERISTICS over full operating voltage and ambient temperature ranges, unless otherwise noted Characteristic Symbol Electrical Characteristics Supply Voltage 1 V Output Leakage Current I OUTOFF Output On Voltage V OUT(SAT) 2 Power-On Time Output Rise Time 3 Output ...

Page 4

A1205 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro Web site. Continuous-Time Bipolar Switch Symbol Test Conditions* Package LH, 1-layer PCB with copper limited to solder pads ...

Page 5

A1205 Supply Current (On) versus Ambient Temperature 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 – (°C) A Supply Current (Off) versus Ambient Temperature 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 – ...

Page 6

A1205 Operate Point versus Ambient Temperature Operate Point versus Ambient Temperature –10 –20 –30 –40 –50 – (°C) (° Release Point versus Ambient Temperature 40 30 ...

Page 7

A1205 Bipolar Device Switching The devices of the A120X family provide highly sensitive switching for applications using magnetic fields of alternating polarities, such as ring magnets. There are three switching modes for bipolar devices, referred to as latch, unipolar switch, ...

Page 8

A1205 the field is reduced beyond the B level, the device switches OP back to the low state. The typical output behavior of the A120x devices is latching. However, the A120x family is designed to attain a small hys- teresis, ...

Page 9

A1205 continuous-time devices have the shorter power-on time, they are the clear choice for such applications. For more information on the chopper stabilization technique, refer to Technical Paper STP 97-10, Monolithic Magnetic Hall Sensing Using Dynamic Quadrature Offset Cancellation and ...

Page 10

A1205 Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied power or improving the heat dissipation properties of ...

Page 11

A1205 +0.12 2.98 –0.08 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and ...

Page 12

A1205 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2006-2010, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail ...

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