COMPOSITION
AXIAL
OD/OF/OA Series
Little Demon ? Carbon Composition Molded
OD/OF Series (5% Tol.) OA Series (10%)
PA C K A G I N G
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.
52.4mm +1.6
Tape/Reel
Qty./reel
Reel size (mm)
Qty./carton
Gross carton wt. (kg)
Carton size (m 3 )
OD OF
5000 3000
260 260
40,000 24,000
12 13
0.04 0.04
0.5mm max.
-1.4
6mm ± .5
5.08mm ± .38
275mm ± 5 (OD)
455mm ± 5 (OF)
280mm
(ref.)
260mm
± 5
Ammo Box
Tape width (mm)
Qty./box
Qty./carton
Gross carton wt. (kg)
Carton size (m3)
OD OF
52 52
2000 2000
30,000 30,000
10 16
0.03 0.05
L 1 L 2
L 1 – L 2 = 1mm max.
1mm max.
60mm ± 5 (OD)
65mm ± 5 (OF)
3.2mm min.
75mm ± 5
14.5mm ± .5
3mm
RESISTOR USE GUIDELINES
60.4mm ± 1
60.4mm ± 1
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.
BAKE PROCEDURE
A. Heat Treatment
    110°C ±10°C
    15 hours
B. Frequency of
heat treatment
    1 time only
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
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.
O R D E R I N G I N F O R M AT I O N
? OD/OF Series available in E24 values
? OA Series available in E12 values
Tape & reel
RoHS compliant optional
O D 6 8 3 J E -TR
Series Ohms Tolerance
OD 68G = 6.8 OD, OF: J = 5%
OF 680 = 68 OA: K = 10%
OA 681 = 680
682 = 6,800
683 = 68,000
684 = 680,000
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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