THICK FILM
AXIAL
TFS Series
Surge Capable
Thick Film Non Inductive
F E AT U R E S
? Appropriate for medical surge protec -
tion applications
? Ideal to replace standard carbon com -
position resistors
? Custom dimensions, values, toler -
ances and characteristics available
The TFS Series has been specifically developed to absorb large 
amounts of energy by efficient use of its compact mass. Ideal 
for medical surge protection applications, these thick film resis -
tors offer non-inductive performance in an axial package.
Uses include power supply conversion, electron microscopes, 
X-ray systems, high-resolution CRT displays, and geophysical 
instrument related products.
S E R I E S S P E C I F I C AT I O N S
Type
TFSA
TFSB
TFSC
TFSD
TFSE
TFSF
U (KV)
3
3.5
4
7
7
11
Energy* (J)
6
9
11
33
44
55
Power (W)
0.5
0.5
0.75
1
1.5
2
*PUBLISHED ENERGY RATING IS FOR 10MS PULSE. FOR SHORTER PULSES ENERGY RAT -
ING HAS TO BE DERATED ACCORDING TO MAX. INDIVIDUAL PULSE RATING CHART AND
SINGLE PULSE ENERGY RATING CONSIDERATIONS.
CHARACTERISTICS
Resistive Element Thick Film
Encapsulation Screen Printed Glass
Resistance Value 100Ω up to 100KΩ
Temperature Coefficient 100ppm/°C
Tolerance 1%, 2%, 5%, 10%
Operating Temperature -55°C to +200°C
Test VDE 0750 (Pulse Duration 10 msec)
Notes
? MOMENTARY OVERLOAD CAPABILITY IS 5 TIMES RATED POWER FOR 1 SECOND OR 2 TIMES
RATED POWER FOR 5 SECONDS. ALWAYS VERIFY DESIGNS WITH PULSE AND SURGE CONDI -
TIONS THROUGH THOROUGH TESTING OF THE DESIGN AT MAXIMUM OPERATING TEMPERA -
TURE AND MAXIMUM PULSE LOADING (OR SOME MARGIN ABOVE MAXIMUM PULSE
LOADING).
? DAMAGE TO THE RESISTOR BY EXCESSIVE PULSE LOADING IS GENERALLY INDICATED BY AN
INCREASING RESISTANCE OF THE RESISTOR.
? ENERGY RATINGS ARE BASED ON SINGLE PULSES (AT LEAST 1 MINUTE BETWEEN PULSES).
? FOR MULTIPLE PULSE APPLICATIONS THE ENERGY PULSE RATING SHOULD BE REDUCED AND
THE AVERAGE POWER SHOULD NOT EXCEED THE NOMINAL POWER RATING OF THE SELECTED
MODEL.
? SEE SINGLE PULSE ENERGY SECTION FOR MORE INFORMATION
DIMENSIONS
MM
C
A
B
Type
TFSA
TFSB
Watts
0.5
0.5
A
9
11
B
5.5
5.5
C
10
10
H
0.7
0.7
E
1.1
1.1
0.50mm
H
E
TFSC
TFSD
0.75
1
13
21
5.5
8
10
10
0.7
0.9
1.1
1.3
TFSE
1.5
21
10.5
10
0.9
1.3
0.25mm
TFSF
2
26
10.5
10
0.9
1.3
1-866-9-OHMITE ? INT’L 1-847-258-0300 ? FAX 1-847-574-7522 ? WWW.OHMITE.COM ? INFO@OHMITE.COM
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