Leaded ResistoRs
Power Wirewound &
Vertical Lead Type
Cement Resistors
Normal & Miniature Style [ PSM Series ]
Feat URes
Power Rating 4W, 5W, 7W, 9W
Resistance Tolerance 5%, 10%
T.C.R 400ppm/C
de Rati NG CURVe
For resistors operated in ambient temperatures above 70C, power rating must be derated
iNt Rod UCtio N
in accordance with the curve below.
The materials used and the construction
70 155 275 C
Rated Load (%)
100
techniques ensure excellent flame resistance,
80
arc resistance and moisture resistance as well
as self-extinguishing capabilities. They will 60
withstand the most rigorous loading test.
40
20
As resistors in radio and television receivers,
hazardous conditions such as smoking and 0
-50 0 50 100 150 200 250 300 Ambient Temperature (C)
redheat can be completely prevented by the
proper choice of power resistors.
di MeNsio Ns Unit: mm
st YLe di MeNsio N
max.1.5
Normal Miniature L W H d
323 L
d
PSM400 - 201.0 7.00.5 8.00.4 0.80.02
PSM500 - 251.0 7.00.5 8.00.4 0.80.02
W W
H H - PSM7WS 251.0 9.00.4 10.00.4 0.80.02
PSM700 - 381.0 7.00.5 8.00.4 0.80.02
PSM400-700 PSM7WS/900
PSM900 - 381.0 10.00.4 10.00.4 0.80.02 3
Note:
eLeCt RiCa L CHa Ra Cte Risti Cs
st YLe Ps M400 Ps M500 Ps M7Ws Ps M700 Ps M900
Power Rating at 70C 4W 5W 7W 9W
Resistance Range 0.1 - 2.2K 0.1 - 2.5K 0.5 - 3.9K
Operating Temp. Range -55C to +155C
Temperature Coefficient 400ppm/C
Note: Special value is available on request
eNViRo NMeNta L CHa Ra Cte Risti Cs
PeRFo RMa NCe test test M et Hod a PPRaise
Short Time Overload IEC 60115-1 4.13 2.5 times RCWV for 5 Sec. 2.0%+0.05
Voltage Proof IEC 60115-1 4.7 in V-block for 60 Sec., test voltage by type By type
Temperature Coefficient IEC 60115-1 4.8 -55C to +155C By type
Insulation Resistance IEC 60115-1 4.6 in V-block for 60 Sec. >1,000M
Solderability IEC 60115-1 4.17 2355C for 30.5 Sec. 95% Min. coverage
No deterioration of
Solvent Resistance of Marking IEC 60115-1 4.30 IPA for 50.5 Min. with ultrasonic
coatings and markings
Robustness of Terminations IEC 60115-1 4.16 Direct load for 10 Sec. in the direction of the terminal leads 2.5kg (24.5N)
Periodic-pulse Overload IEC 60115-1 4.39 4 times RCWV 10,000 cycles (1 Sec. on, 25 Sec. off) 2.0%+0.05
Damp Heat Steady State IEC 60115-1 4.24 402C, 90-95% RH for 56 days, loaded with 0.1 times RCWV 5.0%+0.05
Endurance at 70C IEC 60115-1 4.25 702C at RCWV for 1,000 Hr. (1.5 Hr. on, 0.5 Hr. off) 5.0%+0.05
Temperature Cycling IEC 60115-1 4.19 -55C Room Temp. +155C Room Temp. (5 cycles) 2.0%+0.05
Resistance to Soldering Heat IEC 60115-1 4.18 2603C for 101 Sec., immersed to a point 30.5mm from the body 1.0%+0.05
Note: Rated Continuous Working Voltage (RCWV) = Power Rating x Resistance Value