A3240ELT Allegro Microsystems Inc, A3240ELT Datasheet

A3240ELT

Manufacturer Part Number
A3240ELT
Description
Manufacturer
Allegro Microsystems Inc
Datasheet

Specifications of A3240ELT

Magnetic Type
Bipolar
Operating Supply Voltage (min)
4.2V
Operating Supply Voltage (typ)
5/9/12/15/18V
Operating Supply Voltage (max)
24V
Output Current
25mA
Mag Sensor Operate Point (g)
50Gs
Mag Sensor Release Point (g)
5Gs
Mag Sensor Hysteresis(g)
10Gs
Package Type
SOT-89
Pin Count
3 +Tab
Mounting
Surface Mount
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Not Compliant
Features and Benefits
▪ Resistant to Physical Stress
▪ Superior Temperature Stability
▪ Output Short-Circuit Protection
▪ Operation From Unregulated Supply
▪ Reverse Battery Protection
▪ Sol id-State Reliability
▪ Small Size
Packages:
27621.20g
Not to scale
3-pin SOT89
(LT package)
3-pin SOT23W
(LH package)
X
REG.
SUPPLY
Functional Block Diagram
(UA package)
SUBCIRCUITS
3-pin SIP
TO ALL
Description
The A3240 Hall-effect switch is an extremely tempera-
ture-stable and stress-resistant sensor especially suited for
operation over extended tem per a ture ranges to +150°C.
Superior high-temperature per for mance is made possible
through dynamic offset cancellation, which reduces the
residual offset voltage normally caused by device overmolding,
tem per a ture de pen den cies, and thermal stress.
The device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper
sta bi li za tion, Schmitt trigger, and a short-circuit protected
open-collector output to sink up to 25 mA. A south pole of
sufficient strength will turn the output on. An on-board regulator
permits operation with supply voltages of 4.2 to 24 volts.
Three package styles provide a magnetically op ti mized pack age
for most ap pli ca tions. Package type LH is a modified SOT23W
surface-mount package, LT is a miniature SOT89/TO-243AA
transistor package for surface-mount applications; while UA is
a three-lead ultra-mini-SIP for through-hole mounting. The LH
and UA packages are also available in a lead (Pb) free version
(suffix, –T) , with a 100% matte tin plated leadframe.
Chopper-Stabilized, Precision
CONTROL
CURRENT
LIMIT
Hall-Effect Switch
<1
GROUND
Dwg. FH-020-1
OUTPUT
A3240

Related parts for A3240ELT

A3240ELT Summary of contents

Page 1

Features and Benefits ▪ Resistant to Physical Stress ▪ Superior Temperature Stability ▪ Output Short-Circuit Protection ▪ Operation From Unregulated Supply ▪ Reverse Battery Protection ▪ Sol id-State Reliability ▪ Small Size Packages: 3-pin SOT89 3-pin SOT23W (LT package) (LH ...

Page 2

... A3240 Selection Guide Part Number Packing 1 A3240ELHLT-T 7-in. reel, 3000 pieces/reel Surface Mount A3240ELT-T Bulk, 500 pieces/bag 2 A3240ELTTR-T 7-in. reel, 1000 pieces/reel Surface Mount A3240EUA-T Bulk, 500 pieces/bag A3240LLHLT-T 7-in. reel, 3000 pieces/reel Surface Mount A3240LLT-T Bulk, 500 pieces/bag 2 A3240LLTTR-T 7-in. reel, 1000 pieces/reel Surface Mount ...

Page 3

A3240 Suffix ‘–LT’ & ‘–UA’ Pinning (SOT89/TO-243AA & ultra-min SIP 800 700 600 500 400 300 200 100 Chopper-Stabilized, Precision Hall-Effect Switch PTCT 3 Dwg. PH-003-2 Pinning is shown viewed from branded side. Package Power ...

Page 4

A3240 ELECTRICAL CHARACTERISTICS over operating temperature range. Characteristic Supply Voltage Range Output Leakage Current Output Saturation Voltage Output Current Limit Power-On Time Chopping Frequency Output Rise Time Output Fall Time Supply Current Reverse Battery Current Zener Voltage Zener Impedance NOTES: ...

Page 5

A3240 TYPICAL OPERATING CHARACTERISTICS OUTPUT SATURATION VOLTAGE 300 OUT 200 100 0 - AMBIENT TEMPERATURE IN C Chopper-Stabilized, Precision ...

Page 6

A3240 TYPICAL OPERATING CHARACTERISTICS OUTPUT SATURATION VOLTAGE 250 225 200 175 150 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE IN VOLTS Chopper-Stabilized, Precision Hall-Effect Switch as a function of supply voltage SWITCH POINTS OPERATE POINT RELEASE POINT ...

Page 7

A3240 Chopper-Stabilized Technique. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. These devices use a proprietary dynamic offset ...

Page 8

A3240 +0.12 2.98 –0.08 1.49 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 ...

Page 9

A3240 Package LT, 3-Pin (SOT89/TO-243AA) +0.15 2.45 +0.15 –0.16 4.10 –0.16 1 0.42±0.06 0.50±0.06 For Reference Only; not for tooling use (reference JEDEC. TO-243AA) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and ...

Page 10

A3240 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 2 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2000-2008, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; ...

Related keywords