(401) 943-2686 | redrock@cotorelay.com | www.cotorelay.com
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Copyright 2018. All rights reserved. | rev. 06132018 | page 1
1 Description
The RedRock 120 Series is an integrated digital magnetic sensor ideal
for use in medical, industrial, automotive and consumer switching
applications. Based on patented Tunneling Magnetoresistance (TMR)
technology with CMOS process, the RR120 Series can function even
in low magnetic fields with large air gaps. The RR120 Series provides
high sensitivity with low power consumption in a small footprint
package.
*Please note: the RR120 Series is not recommended for new designs.
Please reference the RR121.
2 Features
u High sensitivity
u Stable temperature performance
u Resistant to mechanical stress
u Low power consumption
u High frequency performance
u Logic output for design flexibility
u REACH Compliant
u RoHS Compliant
3 Applications
u Door or lid closure detection
u Smart phones, tablets and laptops
u Bare glass reed switch replacement
u Motor controllers
u Proximity detection
u Open-close detection
u Water, electric and gas meters
u Fluid level detection
u “Wake-Up” functionality
Ordering Information
Part Number RR120-A
X
1
X-X
0
Model Number
Magnetic Sensitivity (G)
A - Op = 30
Rel = 15
Temp Rating (ºC)
1 - Industrial (-40-+85)
Power Rating
1 - Default Value
Magnetic Polarity
1 = Unipolar
Special Feature
0 - N/A
Package
0 - SOT-23
REDROCK™ RR120 SERIES TMR DIGITAL SENSOR
2.9 (0.114)
12
1
3
2
1.1
(0.043)
1.6
(0.063)
1.2
(0.047)
1.4
(0.057)
2.8
(0.110)
0.4
(0.017)
0.1
(0.004)
0.6
(0.024)
1.90 (0.075)
0.4 (0.016)
Top View
Side View
End View
GND
Vdd
VOUT
3
1
2
2.90±0.15
(0.114 ± .006)
1.45±0.20
(0.057 ± .008)
1.60±0.15
(0.063 ± .006)
2.80±0.25
(.110±
.010)
0.6
(0.024)
1.90 (0.075)
0.40±0.15
(.016 ± .006)
Top View
Side View
End View
1.10±0.15
(.043± .006)
0.10±0.10
(.004 ± .004)
0.44±0.15
(.017 ± .006)
1.20±0.20
(.047 ± .008)
4 Dimensions Millimeters (Inches)
5 Device Nomenclature
(401) 943-2686 | redrock@cotorelay.com | www.cotorelay.com
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page 2 | Copyright 2018. All rights reserved. | rev. 06132018
6 Specifications
Parameters Units Min Typ Max
OPERATING CHARACTERISTICS1
Operate Sensitivity G20 30 40
Release Sensitivity G 8 15 25
Hysteresis G15
Operate Time ms 30
Release Time ms 30
Temperature Coefficient of Operate Sensitivity G/ºC -0.07
ELECTRICAL CHARACTERISTICS1
Supply Voltage (Vdd) V 2.7 3.0 3.6
Average Current Drain nA 250
Output Voltage (High)2 (Vouth) V 2.7 V
Output Voltage (Low)2 (Voutl) V 0.2 V
ABSOLUTE ENVIRONMENTAL RATINGS
Operating Temperature: Industrial ºC -40 85
Storage Temperature ºC -55 150
Soldering Temperature (3 cycles, 1 min.) ºC 260
Operating Magnetic Field G100
ESD Level (HBM) V 4000
9 Magnetic Field vs. Output Status
7 Sensor Polarity Diagram
8 Digital Function Block Diagram
10 MTJ Sensor Location Diagram
V
DD
DIGITAL
PUSH-PULL
OUTPUT
GND
CURRENT
SOURCE DUTY CYCLE
CONTROL
OUTPUT
LOGIC &
LATCH
Bop/Brp
Comparators
TMR
SENSOR
VREF
Notes:
1. All characteristics as measured at 25ºC
2. See "Magnetic Field vs. Output Status" (at right) for more details.
12
S
N
3
D
B
C
A
12
3
Symbols
A
B
C
D
1.60
2.90
0.80
1.45
Nominal
Dimensions
OUTPUT HIGH = OFF
OUTPUT LOW = ON
10
0.0
1.0
2.0
3.0
4.0
5.0
20
30
40
50
60
MAGNETIC FIELD (GAUSS)
OUTPUT STATUS (VOLTS)
TIME
BRP = 15G
BOP = 30G HYSTERESIS
BOP-BRP = 50%
BOP
VOUT
BRP BOP
BHYS
Output ON
Output OFF
Switch to High
Switch to Low
B+
Characteristic
North Pole
Null or Weak
Magnetic Field
South Pole
B > BOP Low
B < BRP High
B > BOP High
Conditions Output
REDROCK™ RR120 SERIES TMR DIGITAL SENSOR
(401) 943-2686 | redrock@cotorelay.com | www.cotorelay.com
™
Copyright 2018. All rights reserved. | rev. 06132018 | page 3
Standard packaging is Tape & Reel containing 3,000 pieces. Below is a chart of Tape & Reel dimensions for standard TMR products.
11 TMR Sensor & Switch Packaging
Ø
13.5±0.05
2.2±0.05
10.6
0.2
0.4
0.6
0.8
0.2
0.4
EIAJ
0.6
0.8
5
4
3
2
1
0
4
3
2
1
0
0
.
9
5
m
m
0
.
7
5
m
m
Ø
60.0±0.05
Ø
178.0±0.05
9.0
+1.5
-0
Ø
60.0±0.05
Ø
178.0±0.05
9.0
+1.5
-0
see
Fig. B
below
2.0 ± 0.05
Ø
1.1 ± 0.1
4.0 ± 0.01
4.0 ± 0.01
1.75 ± 0.1
3.5 ± 0.05
8.0 ± 0.2
2.75
Ø
1.5
+0.1
-0
1.1 ± 0.1
Ao3.3 ± 0.1
5º MAX.(2X)5º MAX.(2X)
R0.3
R0.3
Ko1.47 ± 0.1
0.20 ± 0.05
5º MAX.(2X)
5º MAX.
R0.3
R0.3
0.6
Bo3.2 ± 0.
1
2.55 ± 0.
1
see Fig. A
below
Fig. AFig. B
REDROCK™ RR120 TMR SERIES TECHNICAL & APPLICATION NOTES
(401) 943-2686 | redrock@cotorelay.com | www.cotorelay.com
™
page 4 | Copyright 2018. All rights reserved. | rev. 06132018
Notes:
1. Fully compatible with standard no-lead solder profile, 260 ºC for 1 minute max (3 cycles max)
2. Profile shown as example. Users are advised to develop their own board-level profile
3. Temperature tolerance: +0 ºC, as measured at any point on the package or leads
4. MSL rating of 1 compatible with J-STD-020 or equivalent.
12 Suggested Solder Pad Layout
14 Application Circuits
13 Suggested Reflow Profile
3X
0.047
0.062
3X
0.030
0.124
0.075
0.037
(Units in mm)
Soak
250
15-25 s
Typical 260 ºC Max (Lead-Free)
60 SECONDS
MAXIMUM
240-250 ºC Max Range (Leaded)
Cool Down 2-4 ºC/s
200
150
100
50
05050 150 200
250
Time (s)
Temperature (ºC)
Preheat at 2-3 ºC/s
GND
RR120 VOUT
V
dd
2
1
3
0.1mF
RR120 Digital Output
Application Circuit
The output voltage on the RR120 is active
low, meaning that while a sufficiently strong
magnetic field is present, the output voltage
is low. The output voltage can be connected
to a digital I/O pin on a microcontroller. A
decoupling capacitor between the supply
voltage and ground is required with place-
ment close to the magnetic sensor. A typical
capacitor value of 0.1 mF will suffice.
REDROCK™ RR120 TMR SERIES TECHNICAL & APPLICATION NOTES
(401) 943-2686 | redrock@cotorelay.com | www.cotorelay.com
™
Copyright 2018. All rights reserved. | rev. 06132018 | page 5
15 Glossary of Terms
Hysteresis: Hysteresis refers to the difference between two points
of interest for a particular device. For digital sensors and switches, it
represents the difference between the operate sensitivity and the
release sensitivity, expressed either as an absolute value (BOP – BRP) or
the % difference (BOP – BRP)/BOP. For an analog sensor, the hysteresis is
the difference between the “magnet approach curve” and the “magnet
recede curve.”
Magnet Approach Curve: The magnet approach curve is the char-
acteristic change in resistance of an analog TMR sensor as an applied
magnetic field approaches the sensor, typically plotted as a function of
the magnetic field strength.
Magnet Recede Curve: The magnet recede curve is the characteris-
tic change in resistance of an analog TMR sensor as an applied mag-
netic field recedes from the sensor, typically plotted as a function of the
magnetic field strength.
Magnetoresistance: Magnetoresistance is a phenomenon wherein
the electrical resistance of certain materials changes when exposed to
an externally-applied magnetic field.
Magnetic Transfer Curve: The magnetic transfer curve defines the
characteristic behavior of an analog TMR sensor by combining both the
magnet approach curve and the magnet receive curve together.
Magnetic Tunnel Junction: A magnetic tunnel junction is a thin
film structure consisting of two magnetic layers separated by a thin
insulator. Because the insulating layer is thin enough (typically a few
nanometers), electrons can tunnel from one magnetic layer into the
other.
Operate Sensitivity: The operate sensitivity defines the upper limit
of the strength of an applied magnetic field that a digital TMR sensor or
switch must operate.
Operate Time: The operate time is the difference, in time, between
the application of a magnetic field and the output response of the de-
vice. In an analog sensor, the response is a change in output resistance.
In a digital sensor, the response is a change in state of the electrical
output.
Release Sensitivity: The release sensitivity defines the lower limit
of the strength of an applied magnetic field that a digital TMR sensor or
switch must release.
Release Time: The release time is the difference, in time, between
the removal of an applied magnetic field and the output response of
the device. In an analog sensor, the response is a change in output
resistance. In a digital sensor, the response is a change in state of the
electrical output.
Tunnel Magnetoresistance (TMR): Tunnel Magnetoresistance is
the magnetoresistive effect that occurs in a magnetic tunnel junction.
REDROCK™ RR120 TMR SERIES TECHNICAL & APPLICATION NOTES
(401) 943-2686 | redrock@cotorelay.com | www.cotorelay.com
™
page 6 | Copyright 2018. All rights reserved. | rev. 06132018
Magnetic sensitivity maps show the operate and release loci in three-
dimensional space when a magnet is presented to a magnetically
operated switch or sensor. The absolute operate and release distances
between the magnet and the sensor will vary depending on the
sensitivity of the switch and the strength of the magnet. However, the
shape and direction of the operate loci stay relatively constant except
for cases where the magnet is physically much larger than the sensor.
These plots were generated using a 2mm^3 cubic shaped NdFeB N52
magnet with its North pole presented to the ground pin and a South
pole presented to the opposite side.
16 Magnetic Sensitivity Maps
RR120 Magnetic Sensitivity Pattern, perspective view
RR120 Magnetic Sensitivity Pattern, XY plane
RR120 Magnetic Sensitivity Pattern, YZ plane
RR120 Magnetic Sensitivity Pattern, XZ plane
• Operate Points
Release Points
REDROCK™ RR120 TMR SERIES TECHNICAL & APPLICATION NOTES