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92
OD/OF/OA Series
Little Demon® Carbon Composition Molded
OD/OF Series (5% Tol.) OA Series (10%)
Series Mil-R-11 Type Wattage Ohms Tolerance Max. Voltage Dielectric VAC
OD RC07 0.25 2.2-5.6M ±5% 250 500
OF RC20 0.50 2.2-20M ±5% 350 700
OA 1.00 2.2-1M ±10% 500 1000
Series Length max. Diam. max. Lead Dia.
OD 0.276 / 7.0 0.098 / 2.5 0.024/0.60
OF 0.406 /10.3 0.150 / 3.8 0.028/0.70
OA 0.591 /15.0 0.236 / 6.0 0.035/0.92
LD
1.135" ±0.12 / 28.83mm ±3
(OA: 1.18" / 30.0mm)
Terminals Solder-coated copper terminal.
Body Molded Phenolic
Tolerance ±5% (OD/OF); ±10% (OA)
Derating Linearly from 100% @ +70°C to 0% @ 130°C
1
10
Pulse Power (W)
100
1,000
10,000
100,000
Pulse width (s)
110-1
10-2
10-3
10-4
10-5
10-6
10-7
Single Pulse Power Capability
OF
OD
Ohmite’s Little Demons are small, reliable carbon
composition resistors with exceptional strength.
They are made tough by a molding process that
combines the terminals, insulation and resistive ele-
ment into an integrated unit. Along with their small
size, Little Demons perform with low noise, dissipate
heat rapidly and offer high temperature stability.
Color codes are readable even after prolonged use
thanks to a very durable coating that resists abra-
sions and chipping normally associated with auto-
matic insertion equipment.
FEATURES
•Moldedinsulationforhighdielectricstrength
•Ruggedconstruction
•Highsurgecapabilities
•Comparableto“Mil”RC07,RC20,andRC32types
•OD/OFSeriesavailableinE24values
•OASeriesavailableinE12values
SERIES SPECIFICATIONS
CHARACTERISTICS
DIMENSIONS
(continued)
Discontinuance Notice: OA series
is not recommended for new de-
signs. The OA series will no longer
be available for new orders after
8-30-14. After this date existing
stock will be sold until depleted.
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Tape/Reel OD OF
Qty./reel 5000 3000
Reel size (mm) 260 260
Qty./carton 40,000 24,000
Gross carton wt. (kg) 12 13
Carton size (m3) 0.04 0.04
Ammo Box OD OF
Tape width (mm) 52 52
Qty./box 2000 2000
Qty./carton 30,000 30,000
Gross carton wt. (kg) 10 16
Carton size (m3) 0.03 0.05
75mm ±5
60mm ±5 (OD)
65mm ±5 (OF)
275mm ±5 (OD)
455mm ±5 (OF)
52.4mm +1.6
-1.4
6mm ±.5
5.08mm ±.38
0.5mm max.
L1L2
L1 – L2 = 1mm max.
1mm max.
3.2mm min.
280mm
(ref.)
260mm
±5
60.4mm±1
14.5mm ±.5
3mm
75mm ±5
60.4mm ±1
OD/OF/OA Series
Little Demon® Carbon Composition Molded
OD/OF Series (5% Tol.) OA Series (10%)
PACKAGING
RESISTOR USE GUIDELINES
BAKE PROCEDURE
ORDERING INFORMATION
A. Heat Treatment
110°C±10°C
15hours
B. Frequency of
heat treatment
1timeonly
Carbon composition resistors are manufactured by extruding
a blend of carbon and organic binders inside a phenolic outer
body. The extrusion is cut to length, leads inserted, cured,
and marked to form a finished resistor. The carbon and binder
mixture is adjusted to produce different resistance values. The
resistorsaresortedfor5%,10%,and20%tolerancevalues.
Carbon composition resistors are able to withstand larger
short-term pulses and higher voltages than film resistors and
arevirtuallyimpervioustoESDevents(Electro-staticdis-
charge). Carbon composition resistors are also sensitive to
moisture and, therefore, storage recommendations should be
adhered to. Generally, any moisture absorbed during storage
will be "baked out" during the soldering operation. If the prod-
uct is stored properly the resistance shift during the soldering
operationwillbeminimal,lessthan2%or3%.
Carbon composition resistors are highly hygroscopic and
changes in resistance value can occur if too much moisture is
absorbed.Forthisreason,itisrecommendednottousewater
or water-soluble solvents to clean these components. Alcohol
or hydrocarbon solvents are recommended for rinsing.
All resistors are packaged in sealed poly bags with desiccant
to maintain a consistent humidity during storage. If parts are
removed from the protective plastic bag they should be used
as soon as possible or resealed in the plastic bag.
Storage: Ohmite recommends storing carbon composition
resistorsinacontrolledenvironmentatatemperatureof5°to
35°Candrelativehumidityoflessthan60%.Inventoryshould
always be used on a first-in-first-out basis.
D. Cautions
Solderability: may be affected due to oxidization of lead wire
Resistance value: some units may not completely recover to
original value.
Soldering heat: some treated product may have substantial
resistance change during soldering operation. It is recom-
mended that parts be tested to evaluate soldering heat
effects.
C. Solder heat test after treatment
Solder Dip
Type Temp. Time Evaluation
OD 300°C 3sec within±3%
OF 350°C 3sec within±3%
*DepthofImmersion:3mmfromtheresistor
body
•OD/OFSeriesavailableinE24values
•OASeriesavailableinE12values
Series
OD
OF
OA
Tolerance
OD, OF:J=5%
OA: K = 10%
Ohms
68G = 6.8
680 =68
681 = 680
682 = 6,800
683 = 68,000
684 = 680,000
RoHS compliant
OD683JE-TR
Tape & reel
optional
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Ohmite:
OF124J OA104K OD222J OD220J OD22GJ OD224J OD103J OF150J OF151J OF154J OF153J OF131J
OD561J OD471J OD473J OF122J OD122J OF392J OF270J OF273J OF272J OF390J OF274J OF394J
OA151K OA150K OA152K OA103K OA105K OA102K OA101K OF474J OF470J OF472J OF471J OF22GJ
OF203J OF473J OF47GJ OF393J OF271J OF27GJ OF391J OF152J OD152J OA122K OD221J OA393K
OA391K OA390K OF331J OF33GJ OF333J OF221J OF220J OF222J OF224J OD180J OD104J OA471K
OA474K OA470K OA473K OD470J OD474J OD472J OD47GJ OD394J OD27GJ OD392J OD272J OD270J
OD274J OD391J OD393J OD273J OD390J OD271J OD332J OD330J OF330J OF332J OF334J OD105J
OD102J OD101J OD33GJ OD333J OD331J OD153J OD150J OD154J OD151J OD181J OD203J OA184K
OA333K OA22GK OA224K OA220K