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參數資料
| 型號： | A3251LUATL |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Field-Programmable, Chopper-Stabilized Unipolar Hall-Effect Switches |
| 中文描述： | 現(xiàn)場可編程斬波穩(wěn)定單極霍爾效應開關 |
| 文件頁數： | 1/15頁 |
| 文件大?。?/td> | 418K |
| 代理商： | A3251LUATL |
A3250 and A3251
A3250-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
AB SO LUTE MAX MUM RAT NGS
Supply Voltage, V
CC
......................................
26.5 V
Reverse-Supply Voltage, V
RCC
........................
–18 V
Zener Overvoltage, V
Z
.......................................
30 V
Output Current, I
OUT
.........................................
20 mA
Magnetic Flux Density, B.........................
Unlimited
Operating Temperature
Ambient, T
A
, Range J.................
–40oC to 115oC
Ambient, T
A
, Range L................
–40oC to 150oC
Maximum Junction, T
J(max)
........................
165oC
Storage Temperature, T
S
..................
–65oC to 170oC
On-chip protection against:
y
Supply transients
y
Output short-circuits
y
Reverse-battery condition
Field-Programmable, Chopper-Stabilized
Unipolar Hall-Effect Switches
Features and Benefits
Chopper stabilization for stable switchpoints
throughout operating temperature range
The A3250 and A3251 are field-programmable, chopper-stabilized, unipolar Hall-
effect switches designed for use in high-temperature applications. These devices
use a chopper-stabilization technique to eliminate offset inherent in single-element
devices.
The A3250 and A3251 are externally programmable devices. The devices have a
wide range of programmability of the magnetic operate point (B
OP
) while the hys-
teresis remains fixed. This advanced feature allows for optimization of the sensor
switchpoint and can drastically reduce the effects of variations found in a produc-
tion environment, such as magnet and device placement tolerances.
These devices provide on-chip transient protection. A Zener clamp on the power
supply protects against overvoltage conditions on the supply line. These devices
also include short-circuit protection on the output.
The output of the A3250 switches LOW when subjected to a south-polarity mag-
netic field with a flux density that exceeds the threshold for B
OP
, and switches
HIGH when the field drops below the magnetic release point, B
RP
. The output of
the A3251 has the opposite polarity, switching HIGH in a south-polarity magnetic
field that B
OP
, and switching LOW when the field drops below B
RP
.
The other differences in the devices are the power-on state. The A3250 powers-on
in the HIGH state, while the A3251 powers-on in the LOW state.
These devices are available in a TO-92 three-lead ultra-mini SIP (Single In-line
Package), with either straight or formed and trimmed lead configuration.
1. VCC
2. GND
3. VOUT
Package UA, 3-pin SIP
Externally programmable operate point
(through VCC pin)
On-board voltage regulator for 4.2 V to 24 V
operation
2
3
1
TL Option
Part Number
Package
T
A
(oC)
B
hys(typ)
(G)
V
OUT
Power-On
Running*
A3250JUA
A3250JUATL
A3250LUA
A3250LUATL
A3251JUA
A3251JUATL
A3251LUA
A3251LUATL
*In south polarity magnetic field of sufficient strength.
Straight lead
Formed lead
Straight lead
Formed lead
Straight lead
Formed lead
Straight lead
Formed lead
–40 to 115
18
High
Low
–40 to 150
13
–40 to 115
18
Low
High
–40 to 150
13
Use the following complete part numbers when ordering:
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