US3881
Hall Latch
Low Voltage & High Sensitivity
Features and Benefits
Wide operating voltage range from 2.2V to 18V
Very high magnetic sensitivity
CMOS technology
Chopper-stabilized amplifier stage
Low current consumption
Open drain output
Thin SOT23 3L and flat TO-92 3L both RoHS
Compliant packages
Applications
Automotive, Consumer and Industrial
Solid-state switch
Brushless DC motor commutation
Speed detection
Linear position detection
Angular position detection
Proximity detection
Ordering information
Part No.
US3881
US3881
US3881
US3881
US3881
US3881
Temperature Code
E (-40°C to 85°C)
E (-40°C to 85°C)
K (-40°C to 125°C)
K (-40°C to 125°C)
L (-40°C to 150°C)
L (-40°C to 150°C)
Package Code
SE (TSOT-3L)
UA (TO-92)
SE (TSOT-3L)
UA (TO-92)
SE (TSOT-3L)
UA (TO-92)
1. Functional Diagram
2. General Description
The Melexis US3881 is a Hall-effect latch designed
in mixed signal CMOS technology.
The device integrates a voltage regulator, Hall
sensor with dynamic offset cancellation system,
Schmitt trigger and an open-drain output driver, all
in a single package.
The low operating voltage and extended choice of
temperature range make it suitable for use in
automotive, industrial and consumer low voltage
applications.
The devices are delivered in a Thin Small Outline
Transistor (TSOT) for surface mount process and in a
Plastic Single In Line (TO-92 flat) for through-hole
mount.
Both 3-lead packages are RoHS compliant..
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US3881
Hall Latch
Low Voltage & High Sensitivity
Contents
1. Functional Diagram ................................................................................................................................ 1
2. General Description ............................................................................................................................... 1
3. Glossary of Terms .................................................................................................................................. 3
4. Absolute Maximum Ratings ................................................................................................................... 3
5. Pin Definitions and Descriptions ............................................................................................................ 3
6. General Electrical Specifications ............................................................................................................ 4
7. Magnetic Specifications ......................................................................................................................... 4
8. Output Behaviour versus Magnetic Pole ................................................................................................ 4
9. Detailed General Description ................................................................................................................. 5
10. Unique Features .................................................................................................................................. 5
11. Performance Graphs ............................................................................................................................ 6
12. Application Information ....................................................................................................................... 7
12.1. Typical Three-Wire Application Circuit ............................................................................................ 7
12.2. Two-Wire Circuit ............................................................................................................................... 7
12.3. Automotive and Harsh, Noisy Environments Three-Wire Circuit ................................................... 7
13. Application Comments ......................................................................................................................... 7
14. Standard information regarding manufacturability of Melexis products with different soldering
processes .............................................................................................................................................. 8
15. ESD Precautions ................................................................................................................................... 8
16. Package Information ............................................................................................................................ 9
16.1. SE Package (TSOT-3L) ....................................................................................................................... 9
16.2. UA Package (TO-92 flat) .................................................................................................................... 9
17. Contact .............................................................................................................................................. 11
18. Disclaimer .......................................................................................................................................... 11
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US3881
Hall Latch
Low Voltage & High Sensitivity
3. Glossary of Terms
MilliTesla (mT), Gauss
RoHS
TSOT
ESD
BLDC
Units of magnetic flux density:
1mT = 10 Gauss
Restriction of Hazardous Substances
Thin Small Outline Transistor (TSOT package) – also referred with the Melexis package
code “SE”
Electro-Static Discharge
Brush-Less Direct-Current
4. Absolute Maximum Ratings
Parameter
Supply Voltage
Supply Current
Output Voltage
Output Current
Storage Temperature Range
Maximum Junction Temperature
Table 1: Absolute maximum ratings
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated
conditions for extended periods may affect device reliability.
Operating Temperature Range
Temperature Suffix “E”
Temperature Suffix “K”
Temperature Suffix “L”
Symbol
T
A
TA
T
A
Value
-40 to 85
-40 to 125
-40 to 150
Units
°C
°C
°C
Symbol
V
DD
I
DD
V
OUT
I
OUT
T
S
T
J
Value
20
50
20
50
-50 to 150
165
Units
V
mA
V
mA
°C
°C
5. Pin Definitions and Descriptions
SE Pin №
1
2
3
UA Pin №
1
3
2
Name
VDD
OUT
GND
Type
Supply
Output
Ground
Function
Supply Voltage pin
Open Drain Output pin
Ground pin
Table 2: Pin definitions and descriptions
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US3881
Hall Latch
Low Voltage & High Sensitivity
6. General Electrical Specifications
DC Operating Parameters T
A
= 25 C, V
DD
= 2.2V to 18V (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Supply Voltage
V
DD
Operating
2.2
Supply Current
Output Saturation Voltage
Output Leakage Current
Output Rise Time
Output Fall Time
Maximum Switching Frequency
SE Package Thermal Resistance
UA Package Thermal Resistance
I
DD
V
DSon
I
OFF
t
r
t
f
F
SW
R
TH
R
TH
Table 3: Electrical specifications
Single layer (1S) Jedec board
B < B
RP
I
OUT
= 20mA, B > B
OP
B < B
RP,
V
OUT
= 24V
R
L
= 1kΩ, C
L
= 20pF
R
L
= 1kΩ, C
L
= 20pF
1.5
o
Typ
2.5
0.4
0.01
0.25
0.25
10
301
200
Max
18
5
0.5
10
Units
V
mA
V
µA
µs
µs
KHz
°C/W
°C/W
7. Magnetic Specifications
DC Operating Parameters T
A
= 25 C, V
DD
= 2.2V to 18V (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Operating Point
B
OP
1
Release Point
B
RP
T
A
= 85°C, E spec.
-9
Hysteresis
B
HYST
5.5
Operating Point
B
OP
1
Release Point
B
RP
T
A
= 150°C, L spec.
-9
Hysteresis
B
HYST
5.5
Table 4: Magnetic specifications
o
Typ
5
-5
10
5
-5
10
Max
9
-1
12
9
-1
12
Units
mT
mT
mT
mT
mT
mT
8. Output Behaviour versus Magnetic Pole
DC Operating Parameters T
A
= -40 C to 150 C, V
DD
= 2.2V to 18V (unless otherwise specified)
Parameter
Test Conditions (SE)
OUT (SE) Test Conditions (UA)
OUT (UA)
South pole
B < B
RP
High
B > B
OP
Low
North pole
B > B
OP
Low
B < B
RP
High
Table 5: Output behaviour versus magnetic pole
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US3881
Hall Latch
Low Voltage & High Sensitivity
9. Detailed General Description
Based on mixed signal CMOS technology, Melexis US3881 is a Hall-effect device with high magnetic sensitivity. This multi-
purpose latch suits most of the application requirements.
The chopper-stabilized amplifier uses switched capacitor techniques to suppress the offset generally observed with Hall
sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to smaller chip
size and lower current consumption than bipolar technology. The small chip size is also an important factor to minimize
the effect of physical stress.
This combination results in more stable magnetic characteristics and enables faster and more precise design.
The operating voltage from 2.2V to 18V, low current consumption and large choice of operating temperature range
according to “L”, “K” and “E” specification make this device suitable for automotive, industrial and consumer low voltage
applications.
The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using a pull-up
resistor tied between a pull-up voltage and the device output..
10. Unique Features
The US3881 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles
to operate properly.
The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means magnetic
fields with equivalent strength and opposite direction drive the output high and low.
Removing the magnetic field (B→0) keeps the output in its previous state. This latching property defines the device as a
magnetic memory.
A magnetic hysteresis BHYST keeps BOP and BRP separated by a minimal value. This hysteresis prevents output
oscillation near the switching point
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