BW/MBW SERIES
FA037D Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
Industry’s widest selection of fusible film resistors -
1/8W to 3W, .1Ω to 24KΩ, 1 % to 5%, leaded & surface mount
Low cost, quick delivery (available on SWIFTTM program)
Flameproof (UL94V0), surface-mount versions available
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!
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 meets the
requirements of EIA RS-325 and can be useful in eliminating
circuit board damage and fire hazards. Standard fusing
characteristics can be altered to customer requirements.
Low Cost Circuit Protection!
TYPICAL PERFORMANCE
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Inch [mm]
1 Expanded range available 2 Maximum working voltage is determined by E = (PR)1/2, E should not exceed value listed.
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F8/1WBW8/11ΩK01otV002]7.3[541.]7.1[760.]5.[020.]52[00.1A/N
F4/1WBF4/1WBM,W4/11.0 ΩK01otV002052.]4.6[090.]3.2[220.]55.[20.1]62[]5.6[652.]3[811.]1[040.
F2/1WBF2/1WBM,W2/11.0 ΩK42otV052453.]0.9[821.]3.3[520.]6.[20.1]62[]5.9[473.]9.3[451.]5.1[060.
SF2/1WBM,SF2/1WBW2/12.0 ΩK02otV052052.]4.6[090.]3.2[220.]55.[20.1]62[]5.6[652.]3[811.]1[040.
SF1WBM,F1WBW0.11.0 ΩK42otV003573.]5.9[531.]4.3[620.]56.[20.1]62[]5.9[473.]9.3[451.]5.1[060.
F2WBM,F2WBW0.21.0 ΩK42otV003054.]4.11[261.]1.4[]8.[130.20.1]62[]2.11[144.]5[791.]2[080.
F3WBM,F3WBW0.31.0 ΩK42otV053260.±06.]6.1±2.51[230.±22.]8.±6.5[]8.[130.73.1]53[]2.51[895.]6.5[022.]2[080.
FUSING CHARACTERISTICS
APPLIED POWER (WA TTS)
FUSING TIME (SECONDS, TYP .)
60
50
40
30
20
10
05 10 15 20 30 40 50 60 80 100
1/8F
1/4F
1/2F, FS
1F, 1FS
2F
3F
1. Fault level must be suitable to safely open the resistor quickly, especially surface mount
MBW models. If insufficent, the resistor may reach elevated temp. For this reason, the
fusing overload must be relatively large compared to rated W, 20 to 50x is common for
most axial-lead applications, 40 to 100x for most SM circuits. SM fusing times vary due to
mounting geometry/materials, so each application needs to be evaluated by user. The fault
condition must be at least equal to the minimum W indicated in each of the above curves,
and preferably double for SM applications. Fusing may still occur at W levels below the
levels graphed above but not consistently (fast-blow models available). Don’t exceed volt
rating or 200x W rating, whichever is less (increased levels available).
2. For customized models, complete RCD’s Fuse Questionnaire or advise the desired fusing
wattage or current, min.& max. blow time, continuous wattage, ambient temp., pulse
conditions, physical constraints, voltage to be interrupted, frequency, etc.
3. Maintain clearance from any heat-sensitive or flammable materials.
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 BW1/8F & MBW)
6. Verify selection by evaluating under the full range of fault conditions. Place resistors
inside a protective case when testing.
APPLICA TION NOTES:
FUSIBLE FILM RESISTORS,
GENERAL PURPOSE 1/8 WATT to 3 WATT
RCD C omponents Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603-669-0054 Fax: 603-669-5455 Email:sales@rcdcomponents.com
RESISTORSCAPACITOR
S
C
OILSDELAY
LINES
81
← L →
← H → d
↓
↑
↑
↓D
BW ← A →
C
↓
↑
↑
↓
B
MBW
Termination: W = Lead-free, Q = Tin/Lead
(leave blank if either acceptable)
BW Series - Axial Lead MBW Series - SM MELF
P/N DESIGNA TION: BW1F - 101 J T W
RCD Type
Tolerance: J=5% (std.) G=2%, F=1%
Packaging: B=Bulk, T=Tape & Reel
Options (leave blank if standard)
Resis.Code 1%: 3 signif. figures & multiplier,
(R100=.1Ω,1R00=1Ω,10R0=10Ω,1000=100Ω, etc.)
Resis.Code 2%-10%: 2 signif. figures & multiplier,
(R10=0.1Ω, 1R0=1Ω, 100=10Ω, 101=100Ω, etc.)
Term.W is
RoHS
compliant
& 260°C
compatible
RoHS
