TFSC619RFE [OHMITE]
Fixed Resistor, Metal Glaze/thick Film, 0.75W, 619ohm, 1% +/-Tol, 100ppm/Cel, Surface Mount, ROHS COMPLIANT;型号: | TFSC619RFE |
厂家: | OHMITE MFG. CO. |
描述: | Fixed Resistor, Metal Glaze/thick Film, 0.75W, 619ohm, 1% +/-Tol, 100ppm/Cel, Surface Mount, ROHS COMPLIANT 电阻器 |
文件: | 总1页 (文件大小:67K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
F E A T U R E S
S P E C I F I C A T I O N S
• Ideal for medical surge protec-
tion applications
Material
TFS Series
Resistive Element: Thick Film
Encapsulation: Screen Printed
Glass
Electrical
Resistance Value: 100Ω up to
100KΩ
• Ideal to replace standard carbon
composition resistors
• Custom dimensions, values,
tolerances and characteristics
available
Surge Capable Resistors
Thick Film Non Inductive
C
A
Temperature Coefficient:
100ppm/°C
B
Tolerance: 1%, 2%, 5%, 10%
Operating Temperature: -55°C to
+200°C
0.50mm
H
E
Test: VDE 0750 (Pulse Duration
10 msec)
0.25mm
S I N G L E P U L S E E N E R G Y R A T I N G
U
Energy* Power
Dimensions (mm)
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 consid-
eration since they cause an instanta-
Type
TFSA
TFSB
TFSC
TFSD
TFSE
TFSF
(KV)
(J)
6
9
11
33
44
55
(W)
0.5
0.5
0.75
1
A
9
B
C
H
E
3
3.5
4
7
7
5.5
5.5
5.5
8
10.5
10.5
10
10
10
10
10
10
0.7
0.7
0.7
0.9
0.9
0.9
1.1
1.1
1.1
1.3
1.3
1.3
11
13
21
21
26
neous 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 considered:
1. Do not exceed the normal rated
operating voltage of the device.
2. Using the figure at right, estimate
the energy (Ea) and the pulse dura-
tion (ta) for a single pulse in your
application.
3. Calculate the energy ratio in per-
cent (Er) between the nominal
energy rating of the model you
have chosen (see table) and the
single pulse energy in your appli-
cation (Ea from step 2) using the
formula:
V2t
E = –––
R
V
V
V
V
1.5
2
t
11
*Published energy rating is for 10ms pulse. For shorter pulses energy rating has to be
derated according to Max. Individual Pulse Rating chart (below) and Single Pulse Energy
Rating considerations (left).
1
E = –CV2
2
t = RC
t
O R D E R I N G I N F O R M AT I O N
V2t
E = –––
3R
RoHS Compliant
� ꢀ ꢁ ꢂ ꢃ ꢄ ꢄ ꢅ ꢆ ꢇ
t
Series
Type
Ohm Value
Tolerance
F = 1%
G = 2%
See chart Example:
V2t
E = –––
3R
100R = 100�
2K40 = 2400� J = 5%
K = 10%
t
E = Energy
t = Time
V = Voltage
(joules)
(seconds)
(volts)
M A X I M U M I N D I V I D U A L P U L S E R A T I N G
Ea
Er = –––––––– x 100
Enominal
R = Resistance (ohms)
C = Capacitance (farads)
1000
4. Refer to the Pulse Chart. On this
chart find the point where the energy ratio (Er), found at step
3, and time (ta) 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.
100
10
1
E X A M P L E
A 1µF capacitor is charged
to 3.5kV and model TFSC,
1KOhm has been selected.
Model TFSC is rated for 4kV,
so the peak voltage of 3.5kV is
acceptable.
A bigger model should be cho-
sen, for example TFSD. Model
TFSD, 1KOhm, can be used
for this application because
we have an energy ratio Er
of 18%, which is below the
energy curve.
0.1
1 µs
10 µs 100 µs
1 ms
10 ms 100 ms
Pulse Width
N O T E S
• For pulses over 100ms, refer to the momentary overload
specification on the product data sheet. Always verify designs
with pulse and surge conditions through thorough testing of
the design at maximum operating temperature and maximum
pulse loading (or some margin above maximum pulse load-
ing).
1
Ea = ––CV2 = 6.1J
2
6.1J
Er = ––– x 100 = 18%
33J
ta = R C = 1 ms
6.1J
Er = ––– x 100 = 55%
11J
• Damage to the resistor by excessive pulse loading is generally
indicated by an increasing resistance of the resistor.
According to the pulse chart,
an energy ratio of 55% for a
pulse width of 1ms falls well
above the energy curve. The
limit is actually located around
25-30%. Model TFSC cannot
be used for this application.
• 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.
Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
51
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