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THICK FILM
AXIAL
TFS Series
Surge Capable
Thick Film Non Inductive
S I N G L E P U L S E E N E R G Y R AT I N G
V 2
E = ––– t
R
1
ENERGY (E A ) AND THE PULSE DURATION E = –CV 2
(T A ) FOR A SINGLE PULSE IN YOUR APPLICA -
TION.
3. CALCULATE THE ENERGY RATIO IN PERCENT
E = ––– t
ENERGY IN YOUR APPLICATION (E A FROM
STEP 2) USING THE FORMULA:
E A = –– CV 2 = 6.1J
2
ENERGY RATIO E R OF 18%, WHICH IS
BELOW THE ENERGY CURVE.
6.1J
ENERGY RATIO OF 55% FOR A PULSE
ALTHOUGH OHMITE’S TFS SERIES RESISTORS HAVE BEEN SPECIALLY DESIGNED
AND DEVELOPED TO ABSORB MUCH MORE ENERGY THAN STANDARD RESISTORS,
PULSES AND TRANSIENTS REQUIRE SPECIAL CONSIDERATION SINCE THEY CAUSE AN
INSTANTANEOUS TEMPERATURE RISE IN THE RESISTOR FILM. THIS APPLICATION NOTE
CAN GUIDE YOU THROUGH THESE CONSIDERATIONS.
FOR APPLICATIONS WITH TRANSIENTS, PULSES
OR SURGES THE FOLLOWING MUST BE CONSID -
ERED: V
1. DO NOT EXCEED THE NORMAL RATED OPER -
ATING VOLTAGE OF THE DEVICE. t
2. USING THE FIGURE AT RIGHT, ESTIMATE THE
V 2
t = RC
t
(E R ) BETWEEN THE NOMINAL ENERGY RAT -
ING OF THE MODEL YOU HAVE CHOSEN V V 2
(SEE TABLE) AND THE SINGLE PULSE 3R
t
Example
A 1μF CAPACITOR IS CHARGED TO WIDTH OF 1MS FALLS WELL ABOVE THE
3.5KV AND MODEL TFSC, 1KOHM ENERGY CURVE. THE LIMIT IS ACTUALLY
HAS BEEN SELECTED. MODEL TFSC LOCATED AROUND 25-30%. MODEL
IS RATED FOR 4KV, SO THE PEAK VOLT - TFSC CANNOT BE USED FOR THIS
AGE OF 3.5KV IS ACCEPTABLE. APPLICATION.
1 A BIGGER MODEL SHOULD BE CHOSEN,
FOR EXAMPLE TFSD. MODEL TFSD,
1KOHM, CAN BE USED FOR THIS
T A = R C = 1 MS APPLICATION BECAUSE WE HAVE AN
6.1J
E R = ––– X 100 = 55%
11J
ACCORDING TO THE PULSE CHART, AN E R = ––– X 100 = 18%
33J
Maximum Individual Pulse Rating
1000
E = ––– t
E A
E R = –––––––– X 100
E NOMINAL
V
V 2
3R
100
4. REFER TO THE PULSE CHART. ON THIS
CHART FIND THE POINT WHERE THE ENERGY
RATIO (E R ), FOUND AT STEP 3, AND TIME
(T A ) COINCIDE. QUALIFY THAT THIS POINT
FALLS BELOW THE MAXIMUM PULSE
ENERGY CURVE. IF THE POINT IS ABOVE
THE CURVE A BIGGER MODEL SHOULD BE
CHOSEN.
t
E = Energy (joules)
t = Time (seconds)
V = Voltage (volts)
R = Resistance (ohms)
C = Capacitance (farads)
10
1
0.1
1 μ s
10 μ s
100 μ s 1 ms
Pulse Width
10 ms
100 ms
O R D E R I N G I N F O R M AT I O N
RoHS Compliant
Standard Part Numbers for TFS Series
TFSA100KJE
Ohms
Tol.
6 Joules
0.5 Watts
9 Joules
0.5 Watts
11 Joules
0.75 Watts
33 Joules
1 Watts
44 Joules
1.5 Watts
55 Joules
2 Watts
Series Energy Rating
JOULES
A = 6 D = 33
B = 9 E = 44
C = 11 F = 55
Ohm Value
EXAMPLE:
100R = 100 ?
2K40 = 2400 ?
Tolerance
F = 1%
G = 2%
J = 5%
K = 10%
100
100
220
270
470
470
680
750
1,000
1,000
1,500
2,200
2,700
4,700
4,700
4,990
5,000
6,800
10,000
10,000
16,000
20,000
20,000
22,000
27,000
47,000
50,000
51,000
75,000
1%
5%
1%
5%
1%
5%
5%
5%
1%
5%
5%
1%
5%
1%
5%
1%
5%
5%
1%
5%
5%
1%
5%
1%
5%
1%
5%
5%
5%
TFSA100RFE
TFSA220RFE
TFSA270RJE
TFSA470RFE
TFSA680RJE
TFSA1K00FE
TFSA1K00JE
TFSA1K50JE
TFSA2K20FE
TFSA4K70FE
TFSA4K70JE
TFSA4K99FE
TFSA75K0JE
TFSA10K0FE
TFSA10K0JE
TFSA20K0FE
TFSA22K0FE
TFSA27K0JE
TFSA47K0FE
TFSA50K0JE
TFSB100RJE
TFSB470RJE
TFSB750RJE
TFSB1K00JE
TFSB2K70JE
TFSB6K80JE
TFSB10K0JE
TFSB20K0JE
TFSB51K0JE
TFSD100RJE
TFSC270RJE TFSD270RJE
TFSC680RJE
TFSD750RJE
TFSC1K00JE
TFSD1K00JE
TFSC1K50JE
TFSD1K50JE
TFSC4K70JE
TFSD4K70JE
TFSC10K0JE
TFSD10K0JE
TFSD20K0JE
TFSC27K0JE
TFSC51K0JE
TFSD51K0JE
TFSE470RJE
TFSE680RJE
TFSE1K00JE
TFSE2K70JE
TFSE6K80JE
TFSE27K0JE
TFSE75K0JE
TFSF100RJE
TFSF270RJE
TFSF680RJE
TFSF750RJE
TFSF1K00JE
TFSF1K50JE
TFSF10K0JE
TFSF16K0JE
TFSF20K0JE
TFSF51K0JE
100,000 1%
100,000 5%
TFSA100KFE
TFSB100KJE
TFSC100KJE
TFSD100KJE
TFSF100KJE
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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