6
Bulk Indium Arsenide BH-700 Series
Hall
Sensors
Single Axis
Description
Designed to meet the requirements of a wide range of magnetic field measurement
applications, the BH-700 Series are small, solid-state devices that provide an output
voltage proportional to the product of control current and ambient flux density.
Five single-axis models are available to measure axial and transverse magnetic field
components with sensitivities from 7.5 to 50mV/kG and input and output resistance of several ohms.
Electrical Specifications
BH-702
a. Air gap: between concentrator and substrate, 0.0025" nominal and 0.003" maximum.
b. Sensitivity: Basic sensitivity of Hall element .15 V/A-kG min. With the unit suspended in a free field of 100 oersteds and
I
c
=200 mA, the open circuit Hall voltage is 8.0 mV min. In a closed magnetic circuit with I
c
=200 mA, V
H
is
3.2mV/Ampere turn min.
c. Polarity: With the magnetic field vector as shown and I
c
entering the red lead, the positive Hall voltage will appear at the blue lead.
a. Linearity:
V
H
vs. B, – 10 to +10 kG: ± 0.25% of reading, max.
V
H
vs. B, – 30 to +30 kG: ±1.0% of reading, max.
V
H
vs. I
c
, 0 to 100 mA: ± 0.1% of reading, max.
V
H
vs. I
c
, 0 to 300 mA: ±1.0% of reading, max.
b. Encapsulation: The BH-701 and the BH-704 are encapsulated in a rugged aluminum oxide ceramic and epoxy
case for excellent heat transfer and strength.
BH-701
BH-704
*approximate
Mechanical Specifications
a. Color Code:
Control Current (l
c
):
Red (+ l
c
)
Black (- l
c
)
Hall Voltage (V
H
):
Blue (+V
H
)
Yellow (- V
H
)
b. Polarity: With the magnetic field vector (+B) entering the top of the Hall plate and l
c
entering the red lead, the positive Hall
voltage will appear at the blue lead.
Models
BH-700
BH-701
BH-702
BH-704
BH-705
Low cost, Transverse, General Purpose
Rugged, High-Linearity, Transverse, Instrumentation Quality
Low Field (ferrite-embedded), Transverse
Rugged, High Linearity, Axial, Instrumentation Quality
General Purpose, Transverse
UNITS
ohms
ohms
mV/kG
±µV
mA
mA
±% of RDG
µV
%/°C
%/°C
±µ V/°C
°C
°C
BH-700
5.5 max.
5.5 max.
50 min.
1500 max.
250
200
3
–
- 0.2
+0.2
6 typical
- 40°C to +100°C
- 40°C to +105°C
BH-701
2 max.
2 max.
7.5±20% (3)
75 max.
300
100
BH-702
3.5 max.
3.5 max.
***
250 max.
300
200
BH-704
2.5 max.
2.5 max.
7.5±20%
75 max.
300
100
BH-705
2.2 max.
2 max.
10±25%
300 max.
250
100
SPECIFICATIONS
Input resistance, R
in
Output resistance, R
out
Open circuit magnetic sensitivity, V
HOC
(1)
Max. resistive residual
voltage, V
M
@ B=0 (1)
Max. control current
@25°C, static air
Nominal control current
Max. linearity error, (0 to 10 kG)
with R
lin
Zero field thermal voltage
Mean temperature coefficient of
V
H
(-20°C to +80°C) (2)*
Mean temperature coefficient of
resistance (-20°C to +80°C) (2)*
Temperature dependence of resistive
residual voltage (-20°C to +80°C) (2)*
Operating temperature range
Storage temperature range
–
5 max.
- 0.04
+0.18
0.3 typical
- 40°C to +100°C
- 40°C to +105°C
–
–
- 0.18
+0.18
2.5 typical
- 55°C to +100°C
- 55°C to +105°C
–
5 max.
- 0.04
+0.18
0.5 max.
- 40°C to +100°C
- 40°C to +105°C
1
5 max.
- 0.08
+0.2
1 max.
- 65°C to +100°C
- 65°C to +105°C
Rev. date 03/2006
6120 Hanging Moss Road • Orlando, Florida 32807 •
www.fwbell.com
Phone (407) 678-6900 • Fax (407) 677-5765 • Toll Free (800) 778-6117
Notes
(1) I
c
=I
cn
(2) I
c
=100 mA
(3) Loaded Sensitivity
Dimensions
typical error in % of output
Hall
Sensors
+1
%
±30
kG linearity
%
+1
BH-701 BH-704
±10
kG linearity
+
1
BH-701 BH-704
4
%
+
1
4
%
-
1%
-1
%
-
1
4
%
-
1
4
%
optimum loading
optimum loading
-10 -8
-6
-4
-2 0.0 2
4
6
8
10
magnetic field strength in kG
magnetic field strength in kG
Note:
Ω
Note:
Ω
Model BH-700 Low Cost Transverse
0.250"
6.35mm
0.025"
0.64mm
+B
0.156"
3.96mm
0.023" max.
0.58mm
0.028" max.
0.71mm
Model BH-704 High Linearity Axial
0.200"
5.08mm
+B
10"
254mm
0.035"
0.89mm
0.200"
5.08mm
0.250" dia.
6.35mm
Active Area
(Approx.) 0.031" dia.
0.79mm
0.106"
2.69mm
0.200" dia.
5.08mm
7.5 "
190.5mm
Hall plate
0.180" x 0.080"
4.57mm x 2.03mm
Blue Yellow Black
Red
Model BH-701 High Linerarity Transverse
Model BH-705 General Purpose Transverse
0.043" max.
1.09mm
0.235"
5.97mm
0.625"
15.88mm
10"
254mm
0.125"
3.18mm
0.032"
0.81mm
0.265"
0.73mm
0.020"
0.51mm
0.200"
5.08mm
0.020" max.
0.51mm
+
0.180"
4.57mm
active area
approx. 0.070" dia.
(1.78mm)
+B
0.023" max.
0.58mm
10"
254mm
Hall plate
0.060" x 0.120"
1.52mm x 3.05mm
Model BH-702 Ferrite Imbedded Transverse
0.100"
2.54mm
0.200"
5.08mm
0.075"
1.91mm
ferrite
concentrator
+B
Black
Yellow
Blue
Red
0.050"
1.27mm
0.082"
±
0.003"
2.08mm
±
0.08mm
0.200"
5.08mm
190.5mm
7
.5"
Notes
All tolerances unless specified are
±.010”
6120 Hanging Moss Road • Orlando, Florida 32807 •
www.fwbell.com
Phone (407) 678-6900 • Fax (407) 677-5765 • Toll Free (800) 778-6117
Rev. date 03/2006
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