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PDF 3425 Data sheet ( Hoja de datos )
| Número de pieza | 3425 | |
| Descripción | DUAL/ CHOPPER-STABILIZED/ ULTRA-SENSITIVE/ BIPOLAR HALL-EFFECT SWITCH | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 3425 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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3425
DUAL, CHOPPER-STABILIZED, ULTRA-SENSITIVE,
BIPOLAR HALL-EFFECT SWITCH
V CC
12
34
Dwg. PH-017
Pinning is shown viewed from branded side.
PRELIMINARY INFORMATION
(subject to change without notice)
August 21, 2000
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VCC ........................ 26.5 V
Reverse Battery Voltage, VRCC .......... -18 V
Zener Current, IZ ............................ 100 mA
Magnetic Flux Density, B ........... Unlimited
Output Off Voltage, VOUT .................... VCC
Output Current, IOUT ........................ 30 mA
Reverse Output Current, IOUT ........ -50 mA
Package Power Dissipation, PD . See Graph
Junction Temperature, TJ ............... +170°C
Operating Temperature Range,
TA, ............................ -40°C to +150°C
Storage Temperature Range,
TS .............................. -65°C to +170°C
The A3425LK dual Hall-effect switch is an extremely
temperature-stable and stress-resistant sensor especially suited for use in
digital-encoder systems in the harsh environments of automotive or
industrial applications over extended temperature ranges to +150°C.
Superior high-temperature performance is made possible through
dynamic offset cancellation, which reduces the residual offset voltage
normally caused by device overmolding, temperature dependencies, and
thermal stress. This device also eliminates the major manufacturing
hurdles encountered in fine-pitch direction-detection applications,
namely maintaining accurate mechanical location between the two active
Hall elements. Here, the two Hall elements are photolithographically
aligned to better than 1 µm, as contrasted with 100 µm or worse me-
chanical location tolerance when manufactured discretely. The
A3425LK is an ultra-sensitive device optimized for use with high-
density ring magnets.
The device includes on a single silicon chip a voltage regulator, two
independent chopper-stabilized Hall-voltage generators , two small-
signal amplifiers, two Schmitt triggers, and two short-circuit protected
open-collector outputs to sink up to 30 mA each. An on-board regulator
permits operation with supply voltages of 3.3 to 26.5 volts. With
suitable output pull ups, it can be used directly with bipolar or MOS
logic circuits.
The A3425LK dual Hall-effect switch is supplied in a 4-pin plastic
SIP for operation over a temperature range of -40°C to +150°C. A
similar device, with on-chip logic processing specifically for direction
detection applications, in a 5-pin SIP, is the A3422LKA.
FEATURES
I Two Matched Hall Switches On A Single Substrate
I 1 mm Sensor-to-Sensor Spacing
I Superior Temperature Stability
I Resistant to Physical Stress
I Output Short-Circuit Protection
I Operation From Unregulated Supply
I Reverse Battery Protection
I Solid-State Reliability
I Integrated ESD Protection on Outputs and Supply
Always order by complete part number, e.g., A3425LK .
1 page  
3425
DUAL, CHOPPER-STABILIZED,
ULTRA-SENSITIVE,
BIPOLAR HALL-EFFECT SWITCH
TYPICAL OPERATING CHARACTERISTICS (cont'd)
as a function of supply voltage
OPERATE AND RELEASE DIFFERENTIALS
25
20
15
10
5
0
-5
-10
-15
-20
-25
-50
-25
BOP
VCC = 3.3 V
VCC = 5-18 V
BRP
VCC = 3.3 V
VCC = 5 V
VCC = 18 V
0 25 50 75 100
AMBIENT TEMPERATURE IN °C
125 150
Dwg. GH-026-9
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
0.039"
1.00 mm
SENSOR LOCATIONS
(±0.005" [0.13 mm] die placement)
E1
A
BRANDED
SURFACE
1
2
0.083"
2.11 mm
0.053"
1.34 mm
E2
34
Allegro
Dwg. MH-001-4
Although sensor location is accurate to three sigma for a
particular design, product improvements may result in small
changes to sensor location.
www.allegromicro.com
5
5 Page 
3425
DUAL, CHOPPER-STABILIZED,
ULTRA-SENSITIVE,
BIPOLAR HALL-EFFECT SWITCH
This page is intentionally left blank.
www.allegromicro.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet 3425.PDF ] | |
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