OD/OF Series
Little Demon® Carbon Composition Molded
10% Tolerance
packagꢂng
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
resistorsꢀinꢀaꢀcontrolledꢀenvironmentꢀatꢀaꢀtemperatureꢀofꢀ5°ꢀtoꢀ
35°Cꢀandꢀrelativeꢀhumidityꢀofꢀlessꢀthanꢀ60%.ꢀInventoryꢀshouldꢀ
always be used on a first-in-first-out basis.
Tape/Reel
OD
OF
0.5mm max.
6mm ±.5
280mm
(ref.)
Qty./reel
5000
260
3000
260
+1.6
-1.4
52.4mm
Reel size (mm)
Qty./carton
40,000 24,000
260mm
±5
Gross carton wt. (kg)
12
0.04
13
0.04
Carton size (m3)
5.08mm ±.38
455mm ±5
Ammo Box
OD
OF
1mm max.
Tape width (mm)
Qty./box
52
52
2000
2000
60mm ±5 (OD)
65mm ±5 (OF)
14.5mm ±.5
60.4mm±1
Qty./carton
30,000 30,000
10
0.03
Gross carton wt. (kg)
Carton size (m3)
16
0.05
L1
L2
3.2mm min.
3mm
75mm ±5
L1 – L2 = 1mm max.
60.4mm ±1
ꢁꢀSꢂStOꢁ uSꢀ guꢂDꢀlꢂnꢀS
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
resistorsꢀareꢀsortedꢀforꢀ10%ꢀandꢀ20%ꢀtoleranceꢀvalues.
Carbon composition resistors are able to withstand larger
short-term pulses and higher voltages than film resistors and
areꢀvirtuallyꢀimperviousꢀtoꢀESDꢀeventsꢀ(Electro-staticꢀdis-
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
operationꢀwillꢀbeꢀminimal,ꢀlessꢀthanꢀ2%ꢀorꢀ3%.
Carbon composition resistors are highly hygroscopic and
changes in resistance value can occur if too much moisture is
absorbed.ꢀForꢀthisꢀreason,ꢀitꢀisꢀrecommendedꢀnotꢀtoꢀuseꢀwaterꢀ
or water-soluble solvents to clean these components. Alcohol
or hydrocarbon solvents are recommended for rinsing.
bakꢀ pꢁOcꢀDuꢁꢀ anD cautꢂOnS
A. Heat Treatment C.ꢀSolderꢀheatꢀtestꢀafterꢀtreatment
D.ꢀCautions
ꢀꢀꢀꢀ110°Cꢀ±10°C
ꢀꢀꢀꢀ15ꢀhours
B.ꢀFrequencyꢀofꢀ
heat treatment
Solder
Dip
Solderability: may be affected due to oxidization of lead wire
Resistance value: some units may not completely recover to
Typeꢀ
ODꢀ
OFꢀ
Temp.ꢀ
Timeꢀ Evaluation
300°Cꢀ
350°Cꢀ
3ꢀsecꢀ withinꢀ±3% original value.
3ꢀsecꢀ withinꢀ±3% Soldering heat: some treated product may have substantial
ꢀꢀꢀꢀ1ꢀtimeꢀonly
resistance change during soldering operation. It is recom-
mended that parts be tested to evaluate soldering heat
effects.ꢀSolderꢀshouldꢀnotꢀcomeꢀinꢀcontactꢀwithinꢀ4mmꢀofꢀ
resistor body as this may cause a significant shift in resis-
tance value due to high heat exposure.
*DepthꢀofꢀImmersion:ꢀ4mmꢀfromꢀtheꢀresistorꢀ
body
OꢁDꢀꢁꢂng ꢂnFOꢁmatꢂOn
RoHS compliant
O D 6 8 3 K E -TR
Series
Ohms
Tolerance
K = 10%
Packaging
None = cut reel, 100/bag (std.)
-TR = taped and reeled
OD
OF
68G=
6.8
68
680
680 =
681 =
-A
-B
= ammo pack
= bulk (loose)
682 = 6,800
683 = 68,000
684 = 680,000
rev 8/21-4
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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