SS275

SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Features
Applications
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−
−
−
−
−
−
−
Solid-State Reliability much better than reed
switch
Omnipolar, output switches with absolute value
of North or South pole from magnet
Wide operating voltage range from 3.5V to 24V
High sensitivity for direct reed switch replacement applications
Solid state switch
Speed detection
Interrupter
Magnet proximity sensor for reed switch replacement
3 pin SOT23 (suffix SO)
3 pin SIP (suffix UA)
General Description
The chopper stabilized amplifier uses switched capacitor techniques to eliminate the amplifier offset voltage, which, in bipolar devices, is a major source of
temperature sensitive drift. CMOS makes this advanced technique possible. The CMOS chip is also
much smaller than a bipolar chip, allowing very sophisticated circuitry to be placed in less space. The
small chip size also contributes to lower physical
stress and less power consumption.
The SS275 Omnipolar Hall effect sensor IC is fabricated from mixed signal CMOS technology .It incorporates advanced chopper-stabilization techniques to
provide accurate and stable magnetic switch points.
The output transistor of the SS275 will be latched on
(BOP) in the presence of a sufficiently strong South or
North magnetic field facing the marked side of the
package. The output will be latched off (BRP) in the
absence of a magnetic field.
Functional Block Diagram
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SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Glossary of Terms
−
−
−
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MilliTesla (mT), Gauss
RoHS
ESD
Operating Point (BOP)
−
Release Point (BRP)
Units of magnetic flux density: 1mT = 10 Gauss
Restriction of Hazardous Substances
Electro-Static Discharge
Magnetic flux density applied on the branded side of the package which turns the
output driver ON (VOUT = VDSon)
Magnetic flux density applied on the branded side of the package which turns the
output driver OFF (VOUT = high)
Pin Definitions and Descriptions
SOT Pin № SIP Pin №
Name
Type
Function
1
1
VDD
Supply
Supply Voltage pin
2
3
OUT
Output
Open Drain Output pin
3
2
GND
Ground
Ground pin
Absolute Maximum Ratings
Parameter
Symbol
Value
Units
Supply Voltage(operating)
VDD
28
V
Supply Current
IDD
5
mA
Output Voltage
VOUT
28
V
Output Curent
IOUT
10
mA
Operating Temperature Range
TA
-40 to 150
°C
Storage Temperature Rang
TS
-50 to 165
°C
-
4000
V
ESD Sensitivity
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum rated conditions for extended periods may affect device reliability.
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SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
DC Electrical Characteristics
DC Operating Parameters: TA = 25°C, VDD=5V.
Parameter
Symbol
Test Conditions
Min
Operating voltage
VDD
Operating
3.5
Supply current
IDD
Output Saturation Voltage
Output Leakage Current
Typ
Max
Units
24
V
B < BRP
5
mA
VDSon
IOUT = 20mA, B > BOP
0.5
V
IOFF
B < BRP VOUT = 24V
1
10
µA
Output Rise Time
tr
RL = 1kΩ, CL = 20pF
0.25
µs
Output Fall Time
tf
RL = 1kΩ, CL = 20pF
0.25
µs
Maximum Switching
Frequency
FSW
---
10
KHz
Package Thermal Resistance
RTH
Single layer (1S) Jedec board
301
°C/W
Operating Parameters: TA = 25°C, VDD=5VDC.
PARAMETER
Symbol
Min
Type
Max
Units
Operating Point
Bop
-
+/-35
+/-60
Gs
Release Point
Brp
+/-10
+/-20
-
Gs
Hysteresis
Bhys
-
15
-
Gs
ESD Protection
Human Body Model (HBM) tests according to: Mil. Std. 883F method 3015.7
Parameter
ESD Voltage
Symbol
VESD
Limit Values
Min
Max
±2
±4
Unit
Notes
kV
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control
procedures whenever handling semiconductor products.
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SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Installation Comments
Consider temperature coefficients of Hall IC and magnetics , as well as air gap and life time variations. Observe
temperature limits during wave soldering. Typical IR solder-reflow profile:
− No Rapid Heating and Cooling.
− Recommended Preheating for max. 2minutes at 150°C
− Recommended Reflowing for max. 5seconds at 240°C
Application Informatio
It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor)
between the supply (VDD Pin) and ground (GND Pin) of the device to reduce both external noise and noise generated by the chopper stabilization technique. As is shown in the following two figures, a 0.1μF capacitor is typical.
For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the VDD pin. When
using a resistor, three points are important:
- the resistor has to limit the reverse current to 50mA maximum (VCC / R1 ≤ 50mA)
- the resulting device supply voltage VDD has to be higher than VDD min (VDD = VCC – R1*IDD)
- the resistor has to withstand the power dissipated in reverse voltage condition (PD = VCC2/R1)
When using a diode, a reverse current cannot flow and the voltage drop is almost constant≈0.7V).
(
Therefore, a 100Ω/0.25W resistor for 5V application and a diode for higher supply voltage are recommended.
When a weak power supply is used or when the device is intended to be used in noisy environment, it is recommended that the second figure is used.
The low-pass filter formed by R1 and C1 and the Zener diode Z1 bypass the disturbances or voltage spikes occurAutomotive and Severe Environment
Protection Circuit
Typical Three-Wire Application Circuit
R1:100
C1
100n
VDD
OUT
VDD
R2
10k
D1
SS275
GND
Z1
C2
4.7n
C1
100
SS275
GND
R2
10k
OUT
C2
4.7n
ring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection. Both solutions provide the required reverse voltage protection.
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SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Package Information
Package SOT, 3-Pin SOT-23:
Notes:
1). PIN OUT:
Top View
Pin 1 VDD
Pin 2 Output
Pin 3 GND
2). All dimensions are in millimeters ;
3
1.50 2.60
1.80 3.00
1
2
1.70
2.10
Side View
End View
2.70
3.10
0.10
0.25
1.00
1.30
0.70
0.90
0.20
MIN
0.00
0.10
0.35
0.50
SOT-23 Package Hall Location
Bottom View of SOT-23 Package
3
Chip
0.56
0.66
0.95
0.80
2
1
1.50
1.40
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SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
2.13
1.87
0.75 ± 0.05
1.52 ± 0.1
Package UA, 3-Pin SIP:
3° ± 1°
1.00
1.20
45° ± 1°
4.0 ± 0.01
1
2
3
3.0 ± 0.01
Sensor Location
Active Area Depth:
0.84(Nom)
3° ± 1°
6° ± 1°
3° ± 1°
6° ± 1°
1
2
3
0.05 ± 0.05
1.6.± 0.1
0.44± 0.01
0.38 ± 0.01
14 .5 ± 1
0.39± 0.01
Notes:
1). Controlling dimension : mm ;
2). Leads must be free of flash and plating voids ;
3). Do not bend leads within 1 mm of lead to package
interface ;
4). PINOUT: Pin 1 VDD
Pin 2 GND
Pin 3 Output
1.27
2.54
Ordering Information
Part No.
Pb-free
Temperature Code
Package Code
Packing
SS275ESOT
YES
-40°C to 85°C
SOT-23
7-in. reel, 3000 pieces/ reel
SS275EUA
YES
-40°C to 85°C
TO-92
Bulk, 1000 pieces/ bag
SS275KSOT
YES
-40°C to 125°C
SOT-23
7-in. reel, 3000 pieces/ reel
SS275KUA
YES
-40°C to 125°C
TO-92
Bulk, 1000 pieces/ bag
SS275LSOT
YES
-40°C to 150°C
SOT-23
7-in. reel, 3000 pieces/ reel
SS275LUA
YES
-40°C to 150°C
TO-92
Bulk, 1000 pieces/ bag
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