www.yageo.com
High power and excellent heat dissipation
shunt resistor (metal current sensor) –
PU series, 2512 (new), 3921, & 5931
Yageo shunt resistor - PU series is a perfect solution
for current sensing applications with high power rating
(up to 10W) requirement. The welding technology is
introduced to combine the center metal alloy and
copper (Cu) at the terminations together. The central
open air design is the key for achieving good heat
dissipation (Fig.1). The selection of metal alloy provides
very low thermal EMF which can help to minimize the
current sensing error.
current sensor are shown in Table 1. In this experiment, a DC
power supply was used to apply power to the samples from
0W to 8W which is clearly over the maximum rated power of
Shunt Resistors with Excellent Heat Dissipation
Fig. 1 The structure of a shunt resistor. The central portion
does not contact with the PCB after mounting.
In order to better understand the effectiveness of
heat dissipation in different structure designs, a
temperature rising test was utilized to measure the
temperature rising range under different power
ratings on a 4mΩ open air shunt resistor, and one
4mΩmetal plate current sensor. The structure of a
metal plate current sensor is shown in Fig.2.
The electrical characteristics of the two samples,
including one shunt resistor and one metal plate
Table 1 The electrical characteristics of the shunt resistor and the metal plate current
sensor which were used in the temperature rising test
current sensor. Since the shunt resistor has better heat dissipation capability, it can afford a higher power rating when
compared to the metal plate resistor. Consequently for products a power rating higher than 3W, the central open air
design is the best solution. This is also the reason why Yageo’s high rated power metal current sensor PU series adopts
this special design with a central open air structure.
Yageo provides high power (up to 10W) metal current sensor - shunt resistor PU series in sizes 2512, 3921 and 5931.
The advantages of good heat dissipation, low thermal EMF, and wide operational temperature range (-65°C~275°C) are
ideal for precise current sensing applications under high temperature environments such as E car battery management
systems, HID (High-Intensity Discharge) headlights, ABS (Anti-lock Braking System) and ESP (Electronic Stability
Program) systems and power systems etc.
Fig. 2 The structure of a metal plate current sensor. The whole
resistor body will be in contact with the PCB after
mounting due to its flat design.
end termination
metal substrate
protective coat
Sample Series Size
Resistance
(Ω)
Power rating
(W)
Tolerance
(%)
1 Shunt (open air design) 2512 4mΩ 5W ±
1%
2 Metal plate 2512 4mΩ 3W ±
1%
the two samples for the purposes of not only ascertaining heat
dissipation capability under normal usage, but also to know
the capability under overloading conditions. The experiment
result is shown in Fig.3. The temperature rise of the shunt
resistor was lower than the temperature rise of the metal
plate current sensor. Besides comparing the temperature rise
of shunt and metal plate resistors, the resistance change rate
after a short time overload test was measured as well.
A 5 time’s larger power rating was applied on the shunt and
metal current sensors for 5 seconds. As shown in Table 2, the
shunt resistor had the lower resistance change rate (-0.18%)
among the two samples.
Both experiment results from the temperature rise test
proved that the heat dissipation performance of the central
open air design shunt resistor is better than the metal plate
www.yageo.com
Yageo shunt resistor - PU series is a perfect solution
for current sensing applications with high power rating
(up to 10W) requirement. The welding technology is
introduced to combine the center metal alloy and
copper (Cu) at the terminations together. The central
open air design is the key for achieving good heat
dissipation (Fig.1). The selection of metal alloy provides
very low thermal EMF which can help to minimize the
current sensing error.
current sensor are shown in Table 1. In this experiment, a DC
power supply was used to apply power to the samples from
0W to 8W which is clearly over the maximum rated power of
In order to better understand the effectiveness of
heat dissipation in different structure designs, a
temperature rising test was utilized to measure the
temperature rising range under different power
ratings on a 4mΩ open air shunt resistor, and one
4mΩmetal plate current sensor. The structure of a
metal plate current sensor is shown in Fig.2.
The electrical characteristics of the two samples,
including one shunt resistor and one metal plate
Shunt Resistors with Excellent Heat Dissipation - PU Series
current sensor. Since the shunt resistor has better heat dissipation capability, it can afford a higher power rating when
compared to the metal plate resistor. Consequently for products a power rating higher than 3W, the central open air
design is the best solution. This is also the reason why Yageo’s high rated power metal current sensor PU series adopts
this special design with a central open air structure.
Yageo provides high power (up to 10W) metal current sensor - shunt resistor PU series in sizes 2512, 3921 and 5931.
The advantages of good heat dissipation, low thermal EMF, and wide operational temperature range (-65°C~275°C) are
ideal for precise current sensing applications under high temperature environments such as E car battery management
systems, HID (High-Intensity Discharge) headlights, ABS (Anti-lock Braking System) and ESP (Electronic Stability
Program) systems and power systems etc.
Fig. 3 Temperature rise under different power loading on the shunt and metal plate current sensors.
The shunt resistor has a lower temperature rise than metal plate current sensor.
Table 2 The resistance change rate between before and after the short time overload test. The shunt
resistor showed the lower resistance change rate.
0
50
100
150
0W 1W 2W 3W 4W 5W 6W 7W 8W
Power(W)
Shunt Resistor and Metal Plate Current Sensor (4mΩ)
Surface Temperature Rise
Shunt resistor
Metal plate
Temperature Rise (
°C)
Short me overload test by 5 mes larger rated power for 5 seconds
Sample Resistance change rate before and aer test (ΔR/R, %)
Shunt resistor -0.18
Metal plate 6.31
the two samples for the purposes of not only ascertaining heat
dissipation capability under normal usage, but also to know
the capability under overloading conditions. The experiment
result is shown in Fig.3. The temperature rise of the shunt
resistor was lower than the temperature rise of the metal
plate current sensor. Besides comparing the temperature rise
of shunt and metal plate resistors, the resistance change rate
after a short time overload test was measured as well.
A 5 time’s larger power rating was applied on the shunt and
metal current sensors for 5 seconds. As shown in Table 2, the
shunt resistor had the lower resistance change rate (-0.18%)
among the two samples.
Both experiment results from the temperature rise test
proved that the heat dissipation performance of the central
open air design shunt resistor is better than the metal plate