™
REDROCK™ RR121 SERIES TMR DIGITAL MAGNETIC SENSOR
1 Description
The RedRock
™
RR121 Series is a magnetic sensor with digital push-
pull output ideal for use in medical, industrial, automotive, and con-
sumer applications. Based on patented Tunneling Magnetoresistance
(TMR) technology with seamless CMOS integration, the RR121 offers
multiple configurations of several parameters to enable applications
like proximity sensing, rotary sensing, and level detection.
The RR121 features available operate sensitivities from 9 G (0.9 mT) to
70 G (7 mT), and either omnipolar, unipolar, or bipolar magnetic field
response. It has the world’s lowest average current drain
(200 nA) for an active magnetic sensor, as well as operating
frequencies up to 10 kHz and high operating temperature ranges
from -40°C up to 125°C.
2 Features
Operate sensitivity from 9 G to 70 G
u
Lowest Average Current < 200 nA
u
Omnipolar and Bipolar Latching Responses Available
u
Operating Frequencies up to 10 kHz
u
Temperature Rated up to 125°C
u
RoHS & REACH Compliant
u
3 Applications
Proximity Detection
u
Rotary Sensing
u
Fluid Level Detection
u
Door & Lid Closure Detection
u
Utility Meters
u
Portable Medical Devices
u
Motor Controllers
u
Consumer Electronics
u
Wake-Up
mProcessor
u
Device Information
Part Series
Package
SOT-23-3
LGA-4
Body Size (mm)
2.9 x 1.6 x 1.2
1.4 x 1.4 x 0.45
RR121
Device Packages
SO
T-2
3-3
A
LG
-4
Functional Block Diagram
V
DD
CURRENT
SOURCE
DUTY CYCLE
CONTROL
TMR
SENSOR
VREF
B
op
/B
rp
Comparators
OUTPUT
LOGIC &
LATCH
DIGITAL
PUSH-PULL
OUTPUT
GND
(401) 943-2686 | redrock@cotorelay.com |
www.cotorelay.com
Copyright 2018. All rights reserved. | rev.05172018 | page 1
REDROCK™ RR121 SERIES TMR DIGITAL MAGNETIC SENSOR
™
Table of Contents
1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4. Specifications for all RR121 Series Sensors . . . . . . . . . . . . . . . . . . . . . . .
4.1 Absolute Environmental Ratings for all RR121 Series Sensors. .
4.2 Absolute Electrical Ratings for all RR121 Series Sensors . . . . . . .
4.3 Operating Electrical Characteristics
for all RR121 Series Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
3
3
17.3 B
OPN
(Orange) and B
OPS
(Green) vs.
Operating Temperature at V
DD
=3.0 V . . . . . . . . . . . . . . . . . . . . . . 13
17.4 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . 13
18. Operate & Release Lobe Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
18.1 RR121-1B53-311 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
19. Operating Characteristics for RR121-3C63-311 . . . . . . . . . . . . . . . . . 14
20. Graphs - Typical Characteristics for RR121-3C63-311 . . . . . . . . . . . .
20.1 Average Supply Current vs. Supply Voltage
vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20.2 Average Supply Current vs. Temperature
vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20.3 Sampling Frequency vs. Supply Voltage vs. Temperature . .
14
14
14
14
5. Operating Characteristics
for RR121-1B13-311 and RR121-1B13-312 . . . . . . . . . . . . . . . . . . . . . . . . . 4
6. Graphs - Typical Electrical Characteristics for
RR121-1B13-311 and RR121-1B13-312 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Average Supply Current vs. Supply Voltage vs. Temperature .
6.2 Average Supply Current vs. Temperature vs. Supply Voltage .
6.3 Sampling Frequency vs. Supply Voltage vs. Temperature . . . .
7. Graphs - Typical Magnetic Characteristics
for RR121-1B13-311 and RR121-1B13-312 . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . . .
7.2 B
RPN
(Red) and B
RPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . . . .
7.3 B
OPN
(Orange) and B
OPS
(Green) vs.
Operating Temperature at V
DD
=3.0 V . . . . . . . . . . . . . . . . . . . . . . . .
7.4 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . . .
4
4
4
5
5
5
5
6
6
21. Operating Characteristics for RR121-1E73-311 . . . . . . . . . . . . . . . . . . 15
22. Graphs - Typical Characteristics for RR121-1E73-311 . . . . . . . . . . . . 15
22.1 Average Supply Current vs. Supply Voltage vs. Temperature 15
22.2 Average Supply Current vs. Temperature vs.
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
22.3 Sampling Frequency vs. Supply Voltage vs. Temperature . . 16
23. Operating Characteristics for RR121-1B93-312 . . . . . . . . . . . . . . . . . . 16
24. Graphs - Typical Characteristics for RR121-1B93-312 . . . . . . . . . . . . 17
24.1 Sampling Frequency vs. Supply Voltage vs. Temperature . . 17
25. Graphs - Typical Magnetic Characteristics for RR121-1B93-311 . .
25.1 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . .
25.2 B
RPN
(Red) and B
RPS
(Blue) vs. Supply Voltage at +25ºC . . . . . .
25.3 B
OPN
(Orange) and B
OPS
(Green) vs.
Operating Temperature at V
DD
=3.0 V . . . . . . . . . . . . . . . . . . . . . .
25.4 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . .
17
17
17
18
18
8. Operate & Release Lobe Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1 RR121-1B13-311 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.2 RR121-1B13-312 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
9. Operating Characteristics for RR121-1A23-311 . . . . . . . . . . . . . . . . . . . 7
10. Operating Characteristics for RR121-1F23-311 . . . . . . . . . . . . . . . . . . . 7
11. Graphs - Typical Characteristics
for RR121-1A23-311 and RR121-1F23-311 . . . . . . . . . . . . . . . . . . . . . . . .
11.1 Average Supply Current vs. Supply Voltage vs. Temperature
11.2 Average Supply Current vs. Temperature vs. Supply Voltage
11.3 Sampling Frequency vs. Supply Voltage vs. Temperature . . .
12. Graphs - Typical Magnetic Characteristics for RR121-1A23-311 . . .
12.1 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . .
12.2 B
RPN
(Red) and B
RPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . .
12.3 B
OPN
(Orange) and B
OPS
(Green) vs.
Operating Temperature at V
DD
=3.0 V . . . . . . . . . . . . . . . . . . . . . . .
12.4 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . .
8
8
8
8
9
9
9
9
9
26. Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
26.1 RR121 Push-Pull Output Application Circuit (SOT-23) . . . . . . . 18
26.2 RR121 Push-Pull Output Application Circuit (LGA-4) . . . . . . . . 18
27. Part Selection & Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . 19
27.1 Part Selection Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
27.2 Device Nomenclature Ordering Information . . . . . . . . . . . . . . . 19
28. Axis of Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
29. Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
29.1 LGA-4 Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
29.2 SOT-23-3 Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
30. TMR Sensor Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
30.1 LGA Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
30.2 SOT Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
31. Magnetic Flux Response Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
31.1 Omnipolar Magnetic Flux Response (Active Low Option) . . 21
31.2 Bipolar Magnetic Flux Response (Active Low Option) . . . . . . 21
32. Output Behavior vs. Magnetic Field Diagrams . . . . . . . . . . . . . . . . . 21
32.1 Output Behavior vs. Magnetic Field - Omnipolar . . . . . . . . . . . . 21
32.2 Output Behavior vs. Magnetic Field - Bipolar . . . . . . . . . . . . . . . 21
33. TMR Sensor & Switch Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
33.1 SOT-23-3 Tape & Reel Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . 22
33.2 LGA-4 Tape & Reel Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
34. Suggested Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
35. Suggested Solder Pad Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
35.1 SOT-23-3 Solder Pad Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
35.2 LGA-4 Solder Pad Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
(401) 943-2686 | redrock@cotorelay.com |
www.cotorelay.com
13. Operate & Release Lobe Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
11.1 RR121-1A23-311 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
14. Operating Characteristics for RR121-1B53-311 . . . . . . . . . . . . . . . . . . 10
15. Operating Characteristics for RR121-1A53-311 . . . . . . . . . . . . . . . . . 11
16. Graphs - Typical Characteristics
for RR121-1B53-311 and RR121-1A53-311 . . . . . . . . . . . . . . . . . . . . . . .
16.1 Average Supply Current vs.
Supply Voltage vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .
16.2 Average Supply Current vs.
Temperature vs. Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . .
16.3 Sampling Frequency vs. Supply Voltage vs. Temperature . .
11
11
11
12
17. Graphs - Typical Magnetic Characteristics for RR121-1B53-311 . . 12
17.1 B
OPN
(Red) and B
OPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . 12
17.2 B
RPN
(Red) and B
RPS
(Blue) vs. Supply Voltage at +25ºC . . . . . . 12
page 2 | Copyright 2018. All rights reserved. | rev.05172018
™
REDROCK™ RR121 SERIES TMR DIGITAL MAGNETIC SENSOR
4 Specifications for all RR121 Series Sensors
4.1 Absolute Environmental Ratings for all RR121 Series Sensors
1
Parameters
Operating Temperature (T
OP
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
Soldering Temperature (3 cycles, 1 min.) (T
SOL
)
ESD Level Human Body Model per JESD22-A114
Units
ºC
ºC
ºC
ºC
V
Min
-40
-65
-40
Typ
Max
+125
+150
+150
+260
±4000
4.2 Absolute Electrical Ratings for all RR121 Series Sensors
1
Parameters
Supply Voltage (V
DD
)
Push-pull Output (Active Low)(V
OUT_PP
)
Open Drain Output Voltage
(Active Low) (V
OUT_OD
)
Input and Output Current (V
IN
/I
OUT
)
Units
V
V
V
mA
Min
-0.3
-0.3
-0.3
-10
Typ
Max
+4.0
V
DD
+0.3
+5.5
+10
4.3 Operating Electrical Characteristics for all RR121 Series Sensors
2
Parameters
Supply Voltage (V
DD
)
Output Voltage (High)
3
(V
OUTH
)
Output Voltage (Low)
3
(V
OUTL
)
Power-On Time (t
ON
)(V
DD
> 2.7V)
Under-Voltage Lockout Threshold
Rising V
DD
(V
UVLO_RISE
)
Under-Voltage Lockout Threshold
Falling V
DD
(V
UVLO_FALL
)
Under-Voltage Lockout Hysteresis (V
UV_HYST
)
Units
V
V
V
ms
V
V
mV
Min
+2.7
90% V
DD
Typ
+3.0
Max
+3.6
10% V
DD
500
+2.20
+1.90
+2.15
+50
+2.60
Notes:
1. Exceeding Absolute Ratings may cause permanent damage to the device. Exposure at the maximum rated conditions for extended periods of time may
also affect device reliability.
2. Unless otherwise specified, all characteristics are measured at 25ºC.
3. See "Magnetic Field vs. Output Status" for more details.
ESD Note: This product uses semiconductors that can be damaged by electrostatic discharge (ESD). When handling, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality. Damage due to inappropriate handling is not covered under warranty.
(401) 943-2686 | redrock@cotorelay.com |
www.cotorelay.com
Copyright 2018. All rights reserved. | rev.05172018 | page 3
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