NSM2012
High-Accuracy, Hall-Effect-Based Current
Sensor IC with Common-Mode Field Rejection
in 3kV Isolation
Datasheet (EN) 1.2
Product Overview
NSM2012 is an integrated path current sensor with a
very low on-resistance of 1.2mΩ, reducing heat loss on
the chip.
NOVOSENSE innovative isolation technology and
signal conditioning design can meet high isolation levels
while sensing the current flowing through the internal
Busbar. A differential Hall pair is used internally, so it has
a strong immunity to external stray magnetic fields.
NSM2012 supports both a ratiometric output and a fixed
output mode. The fixed mode enables customers to use
ADC differential sampling of VREF and VOUT voltages
to reduce external common-mode (such as
temperature,etc). Compared with the current sampling
method of the Shunt+ isolated op amp, NSM2012
eliminates the need for the primary side power supply
and has a simple and convenient layout. At the same
time, it has extremely high isolation withstand voltage
and Lifetime stability.
In high-side current monitoring applications, NSM2012
can reach a working voltage of 600Vpk, and it can
withstand 6kV surge voltage without adding any
protection devices.
Due to NSM2012 internal accurate temperature
compensation algorithm and factory accuracy calibration,
this current sensor can maintain good accuracy in the full
temperature working range, and the customer does not
need to do secondary programming or calibration.
CMTI > 100V/ns
CTI（I）
Creepage distance/Clearance distance: 4mm
NOVOSENSE innovative ‘Spin Current’ technology
makes offset temperature drift very small
Ratiometric output or fixed output
Working temperature: -40°C ~ 125°C
Primary internal resistance: 1.2mΩ
SOIC8 package
UL62368/EN62368 safety certification
ROHS compliance
Applications
Solar System
Industrial Power Supply
Motor Control
OBC/DCDC/PTC Heater
Charging Pile
Device Information
Part Number
NSM2012
Package
SOIC8
Body Size
4.9mm × 3.9mm
Functional Block Diagrams
Support 3.3V/5V power supply (different version)
Key Features
High bandwidth and fast response time
400kHz bandwidth
1.5us response time
High-precision current measurement
Differential Hall sets can immune stray field
High isolation level that meets UL standards
Withstand isolation voltage (VISO): 3000Vrms
Maximum surge isolation withstand voltage (VIOSM):
6kV
Copyright © 2025, NOVOSENSE
Figure 1. NSM2012 Block Diagram
Page 1
NSM2012
Datasheet (EN) 1.2
INDEX
1. PIN CONFIGURATION AND FUNCTIONS ............................................................................................................... 4
2. ABSOLUTE MAXIMUM RATINGS ............................................................................................................................ 5
3. ESD RATINGS ........................................................................................................................................................... 5
4. ISOLATION CHARACTERISTICS ............................................................................................................................. 5
5. SPECIFICATIONS ..................................................................................................................................................... 6
5.1. COMMON CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5VOR3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................... 6
5.2. NSM2012-02B3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................... 7
5.3. NSM2012-02B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................... 8
5.4. NSM2012-05B3F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................... 9
5.5. NSM2012-05B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 10
5.6. NSM2012-10B3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 11
5.7. NSM2012-10B5F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 12
5.8. NSM2012-10B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 13
5.9. NSM2012-10U3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 14
5.10. NSM2012-10U5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 15
5.11. NSM2012-20B3F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 16
5.12. NSM2012-20B3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 17
5.13. NSM2012-20B5F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 18
5.14. NSM2012-20B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 19
5.15. NSM2012-25B5F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 20
5.16. NSM2012-25B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 21
5.17. NSM2012-30B3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 22
5.18. NSM2012-30B5F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 23
5.19. NSM2012-30B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 24
5.20. NSM2012-30U5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 25
5.21. NSM2012-40B3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 26
5.22. NSM2012-40B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 27
5.23. NSM2012-50B3R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 3.3V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 28
Copyright © 2025, NOVOSENSE
Page 2
NSM2012
Datasheet (EN) 1.2
5.24. NSM2012-50B5F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 29
5.25. NSM2012-50B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 30
5.26. NSM2012-50U5F-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 31
5.27. NSM2012-65B5R-DSPR CHARACTERISTICS (TA= -40°C TO 125°C, VCC = 5V, UNLESS OTHERWISE
SPECIFIED) ............................................................................................................................................................. 32
5.28. TYPICAL PERFORMANCE CHARACTERISTICS ........................................................................................ 33
NSM2012-30B3R-DSPR[1] ....................................................................................................................................... 33
NSM2012-30B5R-DSPR[1] ....................................................................................................................................... 34
NSM2012-10U5R-DSPR[1] ....................................................................................................................................... 35
NSM2012-20B5R-DSPR[1] ....................................................................................................................................... 36
6. FUNCTION DESCRIPTION .................................................................................................................................... 38
6.1.
6.2.
6.3.
6.4.
OVERVIEW .................................................................................................................................................... 38
NSM2012 R VERSION (SINGLE-ENDED RATIOMETRIC OUTPUT) ........................................................... 38
NSM2012 F VERSION (FIXED OUTPUT) ..................................................................................................... 38
DEFINITION OF NSM2012 TERMS .............................................................................................................. 39
7. APPLICATION NOTE .............................................................................................................................................. 41
7.1.
7.2.
7.3.
TYPICAL APPLICATION CIRCUIT ................................................................................................................ 41
PCB LAYOUT ................................................................................................................................................. 41
THERMAL EVALUATION ............................................................................................................................... 42
8. PACKAGE INFORMATION...................................................................................................................................... 44
9. ORDER INFORMATION .......................................................................................................................................... 45
10. TAPE AND REEL INFORMATION ......................................................................................................................... 47
11. REVISION HISTORY ............................................................................................................................................. 49
Copyright © 2025, NOVOSENSE
Page 3
NSM2012
Datasheet (EN) 1.2
1. Pin Configuration and Functions
IP+
1
IP+
2
IP-
3
IP-
4
8
VCC
IP+
1
7
VOUT
IP+
2
6
NC
IP-
5
GND
IP-
NSM2012
8
VCC
7
VOUT
3
6
VREF
4
5
GND
NSM2012
R Version
F Version
Figure 1.1 NSM2012 Package
Table 1.1 NSM2012 Pin Configuration and Description
NSM2012 PIN
NO.
Symbol
Function
1-2
IP+
Current flows into the chip, positive direction
3-4
IP-
Current flows out of the chip, negative direction
5
GND
Ground
6
VREF/NC
For ’F’ version, this Pin is VREF;
For ‘R’ version, internal circuit connection, this Pin can also connect to GND
7
VOUT
Output voltage
8
VCC
Power supply
Copyright © 2025, NOVOSENSE
Page 4
NSM2012
Datasheet (EN) 1.2
2. Absolute Maximum Ratings
Parameters
Symbol
Min
Typ
Max
Unit
VCC
VCC
-0.3
6.5
V
25°C
Vout/Vref
-0.3
VCC+0.3
V
25°C
Others Pin
-0.3
VCC+0.3
V
25°C
Storage temperature
TStorage
-40
150
°C
Ambient temperature
Toperation
-40
125
°C
Junction temperature
Tj
-40
150
°C
Comments
3. ESD Ratings
Ratings
Value
Unit
Human body model (HBM), per AEC-Q100-002-RevD
Electrostatic discharge
All pins
±8
kV
±2
kV
Charged device model (CDM), per AEC-Q100-011-RevB
All pins
4. Isolation Characteristics
Parameters
Symbol
Rating
Unit
Comments
Dielectric Surge Voltage
Vsurge
6
kV
Based on IEC61000-4-5
1.2µs/50µs waveform
60s isolation voltage
parameters, according to
UL62368-1, 3.6kV/ 1s
insulation performance will
be tested before delivery,
and partial discharge is
verified to be less than 5pC
Dielectric Strength Test Voltage
Working Voltage for Basic Isolation
VISO
3000
Vrms
VWVBI
424
Vrms
600
Vdc
Maximum approved working
voltage for basic isolation
according to UL60950-1 and
UL62368-1
Common-mode transient immunity
CMTI
>100
V/ns
The criterion for judging the
failure is that the output
peak is greater than 100mV
and the duration is longer
than 1us
Creepage
Creepage
4
mm
Minimum Creepage
Clearance
Clearance
4
mm
Minimum Clearance
Comparative Tracking Index
CTI
>=600
Copyright © 2025, NOVOSENSE
CTI I
Page 5
NSM2012
Datasheet (EN) 1.2
5. Specifications
5.1. Common Characteristics (TA= -40°C to 125°C, VCC = 5Vor3.3V, unless otherwise
specified)
Parameters
Symbol
Supply voltage
VCC
Supply current
ICC
Primary conductor resistance
RP
Min
Typ
Max
Unit
Comments
3
3.3
3.6
V
3.3V version
4.5
5
5.5
V
5V version
12
15
mA
No load,Vcc=5V
7.5
8
mA
No load,Vcc=3.3V
mΩ
TA = 25°C
ms
It is recommended that
customers read data after
Vcc reaches Vccmin 1ms,
and internal register loading
1ms after POR
1.2
Power-on time
Tpo
Output capacitance load[1][2]
CL
Output resistance load[1][2]
RL
Output short current
Ishort
Rail to Rail output voltage[1][2]
Vs
Common mode field
rejection[1][2]
CMFR
>40
dB
Power supply rejection ratio
PSRR
-50
dB
Only for ‘F’ version, DC to 1
kHz, 100 mV pk-pk ripple
around Vcc=5V, IP=0A
Rise time
Tr
0.9
us
Vout=2.2V, TA = 25°C,
CL=1nF, Vcc=3.3V, 30AB, R
version
Propagation dealy
Tpd
0.9
us
Vout=2.2V, TA = 25°C,
CL=1nF, Vcc=3.3V, 30AB, R
version
Response time
Tresponse
1.5
us
Vout=3V, TA = 25°C,
CL=1nF, Vcc=3.3V, 30AB, R
version
Bandwidth[1][2]
BW
400
kHz
-3dB bandwidth, TA = 25°C,
CL=1nF, Vcc=3.3V, 30AB, R
version
120
uArms/√
Hz
TA = 25°C, CL=1nF, Vcc= 5V
140
uArms/√
Hz
±0.2
%
Noise density
[1][2]
Non-linearity
Copyright © 2025, NOVOSENSE
1
10
10
kΩ
25
0.1
mA
VCC-0.1
ND
ENL
nF
V
Short to Vcc and short to
GND,
TA = 25°C
TA = 25°C, CL=1nF, RL=10K
to Vcc or GND
TA = 25°C, CL=1nF,
Vcc= 3.3V
Page 6
NSM2012
Parameters
Reference voltage
Datasheet (EN) 1.2
Symbol
Vref
Min
Typ
Max
Unit
Comments
2.49
2.5
2.51
V
‘FB’ version, Vcc=5V
1.64
1.65
1.66
V
‘FB’ version, Vcc=3.3V
0.49
0.5
0.51
V
‘FU’ version, Vcc=5V
0.32
0.33
0.34
V
‘FU’ version, Vcc=3.3V
Ratiometric output sensitivity
error
SERR
0.75
%
‘R’ version, Vcc=
4.85V~5.15V, TA = 25°C
Rationmetric output offset
error
VOUT0R
0.1
%
‘R’ version, Vcc=
4.85V~5.15V, TA = 25°C
Ratiometric output zero
current output voltage
QVO
VCC/2
‘RB’ version, Vcc=5V/3.3V
0.1*VCC
‘RU’ version, Vcc=5V/3.3V
[1]: Guaranteed by design.
[2]: Guaranteed by Bench Validation
[3]: The increase or decrease of data in charpter 5.X will not send a PCN to the customer if the evaluation does not affect the customer's use.
5.2. NSM2012-02B3R-DSPR Characteristics (TA= -40°C to 125°C, VCC = 3.3V, unless
otherwise specified)
Parameters
Symbol
Min
Current sensing range
Ipr
-2
Sensitivity
Sens
660
mV/A
Iprmin
