FUSIBLE FILM RESISTORS,
GENERAL PURPOSE 1/8 WATT to 3 WATT
RESISTORS CAPACITORS COILS DELAY LINES
BW SERIES
RoHS
Term.W is
RoHS
compliant
& 260°C
compatible
Industry’s widest selection of fusible film resistors-
1/8W to 3W, .1Ω to 24KΩ, 1% to 5%
Low cost, quick delivery (available on
SWIFT
TM
program)
Flameproof (UL94V0), surface-mount versions available
Low Cost Circuit Protection!
RCD pioneered fusible film resistors in the early 1970’s as
a low cost approach to circuit protection in case of overload
or component failure. The component is designed to act as
a conventional resistor under normal operating conditions,
but open quickly under fault conditions. Series BW meet the
requirements of EIA RS-325 and can be useful in eliminat-
ing circuit board damage and fire hazards. Standard fusing
characteristics can be altered to customer requirements.
OPTIONS
Modified fusing characteristics (fast blow, slow blow, etc.)
Increased pulse capability (Option P)
Dozens of additional options are available...
Mil-spec screening/burn-in, special marking, non-standard
values, custom lead forming, increased power or voltage, etc.
Customized components are an RCD specialty!
←
H
→←
L
→
↓
↑
d
→
D
←
Inch [mm]
SPECIFICATIONS
RCD
Type
Wattage Rating
1
1/8W
1/4W
1/2W
1/2W
1.0W
2.0W
3.0W
2
Resis. Range
1
1Ω to 10K
0.1
Ω
to 10K
0.1
Ω
to 24K
0.2
Ω
to 20K
0.1
Ω
to 24K
0.1
Ω
to 24K
0.1
Ω
to 24K
Voltage
Rating
1, 2
200V
200V
250V
250V
300V
300V
350V
L±.032[.8]
.145 [3.7]
.250 [6.4]
.354 [9.0]
.250 [6.4]
.375 [9.5]
.450 [11.4]
D±.024[.6]
.067 [1.7]
.090 [2.3]
.128 [3.3]
.090 [2.3]
.135 [3.4]
.162 [4.1]
d±.003 [.07]
.020 [.5]
.022 [.55]
.025 [.6]
.022 [.55]
.026 [.65]
.031[.8]
.031[.8]
H(Min.)
1.00 [25]
1.02 [26]
1.02 [26]
1.02 [26]
1.02 [26]
1.02 [26]
1.37 [35]
NEW!
BW1/8F
BW1/4F
BW1/2F
NEW!
BW1/2FS
BW1F
BW2F
BW3F
1
.600±.062[15.2±1.6] .220±.032[5.6±.81]
Expanded range available
Maximum working voltage is determined by E = PR, E should not exceed value listed.
FUSING CHARACTERISTICS
FUSING TIME (SECONDS, TYP.)
60
BW1/8F
BW1/4F
50
40
30
20
10
0
BW1/2F, FS
BW1F
BW2F
5
10
15
20
30
BW3F
40
50
60
80
100
APPLIED POWER (WATTS)
APPLICATION NOTES:
1. Fault level must be suitable to safely open the resistor. If insufficent, the resistor
may reach elevated temp. For this reason, the fusing overload must be relatively large
compared to rated W, 20 to40x is common for most circuits, and should be at least
equal to the minimum W indicated in each of the above charts. Fusing may still occur
at W levels below these but not consistently (fast-blow models available). Don’t
exceed volt rating or 200x W rating, whichever less (increased levels avail).
2. For customized models, complete RCD’s Fuse Questionnaire, or advise the desired
fusing wattage or current, min. and max. “blow” time, continuous operating wattage,
ambient temperature, pulse conditions the resistor must withstand, physical con-
straints, voltage to be interrupted, frequency, etc.
3. It is not advisable to mount the resistors against other components or the PCB.
4. Fusing times vary depending on resistance value. Typical fusing times are given
above for 1Ω - 3.9K. Low values tend to fuse slower. Consult factory for assistance.
5. Residual resis. is
≥50x
initial value after fusing at 20x rated W (30x for 1/8W).
6. Verify selection by evaluating under the full range of fault conditions. Place
resistors inside a protective case when testing under overload.
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Coefficient
Load Life Stability
Operating Temp. Range
Power Derating
Dielectric Strength
200ppm/°C
5%
-55 to +165°C
0.71%/°C >25°C
500V (300V BW1/8F)
P/N DESIGNATION:
BW1F
RCD Type
Options
(leave blank if standard)
- 101
J T W
Resis.Code 1%:
3 signif. figures & multiplier,
(R100=.1Ω,1R00=1Ω,10R0=10Ω,1000=100Ω,1001=1K, etc.)
Resis.Code 2%-10%:
2 signif. figures & multiplier,
(R10=0.1Ω, 1R0=1Ω, 100=10Ω, 101=100Ω, 102=1K, etc.)
Tolerance:
J=5% (std.) G=2%, F=1%
Packaging:
B=Bulk, T=Tape & Reel
Termination:
W= Lead-free, Q= Tin/Lead
(leave blank if either is acceptable)
RCD Components Inc,
520 E.Industrial Park Dr, Manchester, NH, USA 03109
rcdcomponents.com
Tel: 603
-
669
-
0054 Fax: 603
-
669
-
5455 Email:sales@rcdcomponents.com
FA037C
Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
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