NPS 2-T126
Power SMD Resistors
•
•
•
•
•
•
•
Resistances from 0.025Ohm to 10kOhms
Power Rating to 25Watt
Resistance Tolerances to ±1%
TCR to ±100ppm/°C
Load Stability to 0.5%
TO-126 Housing (D-Pak)
Solder Reflow Secure at 260°C / 20s
SPECIFICATIONS
Type
Terminals
Resistance Range
Power Rating Heatsink
Power Rating Simple Pad
Thermal Resistance Rthj-c
Tolerances
(others upon request)
Stability
Temperature Coefficient
(TCR 50ppm upon request)
Voltage Proof
Operating Temperature
Resistor Material
Substrate
Housing
Connector Material
Reflow soldering
±500 ppm/°C
2% / 5%
0.025 to 0.049Ohms
NPS 2-T126
2
0.05 to 0.099Ohms
0.1 to 0.99Ohms
25 W
0.6 W
6.0 C / W
1% / 2% / 5%
0.5%
±400 ppm/°C
2.0 kV DC
-40°C to 175°C
Thick Film
Al
2
O
3
Epoxy
Cu / Ni-flash / lead-free tinned
lead-free soldering 260°C / 20s
±300 ppm/°C
±100 ppm/°C
1Ohms to 10kOhms
Ordering Information
Part Description: Part Type - Resistance - Tolerance
NPS 2-T126 1.1 Ohms 1%
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 83
2/16
NPS
2-T126
Power SMD Resistors
SPECIFICATIONS
(continued)
Derating
120
100
Power (% from
nominal power)
Power Rating Notes -
The NPS Series Resistors must be attached to a suitable heat-
sink. The maximum internal resistor temperature is 175°C.
To specify an appropriate heatsink use the following formula :
80
60
40
20
0
0
25 40 55 70 85 100 115 130 145 155 175
Temperature of the backplate (°C)
R
θH
= T
MAX
- ( P x R
θR
) - T
A
P
Where:
R
θH
= Thermal Resistance of Heatsink ( K/W )
R
θR
= Thermal Resistance of Resistor ( K/W )
T
MAX
= Maximum Temperature of Resistor
T
A
= Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
Dimensions
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
N
mm
8.26
8.13
6.35
4.31
1.35
5.08
0.76
2.79
0.8
9.55
10.92
12.32
0.6
1.47
tol.
(±mm)
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.1
0.1
inches
0.33
0.32
0.25
0.17
0.05
0.20
0.03
0.11
0.03
0.38
0.43
0.49
0.02
0.06
tol.
(±inches)
0.008
0.008
0.004
0.004
0.004
0.004
0.004
0.004
0.004
0.008
0.008
0.008
0.004
0.004
Dimension
A
B
C
D
E
F
mm
8.51
7.87
14.1
5.08
1.65
3.81
inches
0.335
0.310
0.555
0.200
0.065
0.150
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
Page 84
2/16
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