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S T A N D A R D P A R T N U M B E R S

The 89 Series is a high-per-

formance axial type resistor.

These molded-construction

metal-housed resistors are

available in higher power rat-

ings than standard axial resis-

tors and are better suited to

withstanding vibration, shock

and harsh environmental con-

ditions.

resistors are aluminum housed

to maintain high stability during

operation and to permit secure

mounting to chassis surfaces.

The metal housing also

provides heat-sinking capabili-

ties.

F E A T U R E S

• High Stability: ±0.5% ΔR.

• High power to size ratio.

• Metal housing allows chassis

mounting and provides heat sink

capability.

89 Series

Axial Term. Wirewound, 1% Tolerance

Series

Wattage

Ohms

Voltage

805

5

0.10-25K

210

810

10

0.10-50K

320

825

25

0.005-75K

520

850

50

0.005-100K

1170

Non-Inductive versions available. Insert “N” before tolerance code. Example: 850NF560

P

terminal

hole dia.

J

R

B

Q

D

G

L

M

A

F

N

E

K

mount

hole dia.

H

C

5 watt

10 watt

25 watt

50 watt

Series (Industrial)

805

810

825

850

Dimensions

Dim. A (in. ±0.062 / mm ±1.57) 1.125 / 28.59 1.375 / 34.93 1.938 / 49.23 2.781 / 70.64

Dim. B (in. ±0.010 / mm ±0.25) 0.490 / 12.45 0.625 / 15.88 0.781 / 19.84 0.844 / 21.44

Dim. C (in. ±0.031 / mm ±0.79) 0.078 / 1.98 0.094 / 2.39 0.172 / 4.37 0.188 / 4.78

Dim. D (in. ±0.010 / mm ±0.25) 0.444 / 11.28 0.562 / 14.28 0.719 / 18.26 1.562 / 39.68

Dim. E (in. ±0.062 / mm ±1.57) 0.600 / 15.24 0.750 / 19.05 1.062 / 26.98 1.938 / 49.23

Dim. F (in. ±0.062 / mm ±1.57) 0.266 / 6.76 0.312 / 7.93 0.438 / 11.13 0.438 / 11.13

Dim. G (in. ±0.062 / mm ±1.57) 0.334 / 8.48 0.438 / 11.13 0.531 / 13.49 0.594 / 15.09

Dim. H (in. ±0.031 / mm ±0.79) 0.245 / 6.22 0.312 / 7.93 0.391 / 9.93 0.422 / 10.72

Dim. J (in. ±0.031 / mm ±0.79) 0.646 / 16.41 0.812 / 20.63 1.094 / 27.79 1.156 / 29.36

Dim. K (in. ±0.005 / mm ±0.13) 0.093 / 2.36 0.094 / 2.39 0.125 / 3.18 0.125 / 3.18

Dim. L (in. ±0.031 / mm ±0.79) 0.320 / 8.13 0.406 / 10.31 0.562 / 14.28 0.625 / 15.88

Dim. M (in. ±0.062 / mm ±1.57) 0.133 / 3.38 0.203 / 5.16 0.281 / 7.14 0.312 / 7.92

Dim. N (in. ±0.031 / mm ±0.79) 0.065 / 1.65 0.094 / 2.39 0.094 / 2.39 0.094 / 2.39

Dim. P (in. ±0.005 / mm ±0.13) 0.050 / 1.27 0.085 / 2.16 0.085 / 2.16 0.085 / 2.16

Q min AWG

16

12

12

12

Dim. R (in., min/mm, min)

0.085/ 2.16

0.140/ 3.56

0.140/ 3.56

0.140/ 3.56

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1.5

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3.0

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100

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150

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200

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250

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300

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400

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500

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750

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= Standard values



= Non-standard values subject to minimum

handling charge per item

Shaded values involve very fine resistance wire and

should not be used in critical applications without

burn-in and/or thermal cycling.

Wattage

Part No.

Prefix 

Suffix

Wattage

Part No.

Prefix 

Suffix

Wattage

Part No.

Prefix 

Suffix

S P E C I F I C A T I O N S

Material

Housing: Metal, anodized alumi-

num.

Internal Coating: Silicone.

Core: Ceramic.

Terminals: Solder-coated axial.

Derating: Linearly from

100% @ +25°C to 0% @

+275°C.

Electrical

Tolerance: ±1% and ±5% (other

tolerances available).

Power rating: Rating is based

on chassis mounting area and

temperature stability. Proper

heat sink as follows: 5W and

10W units, 4” x 6” x 2” x .040”

Aluminum chassis; 25W units, 5”

x 7” x 2” x .040” Aluminum chas-

sis; 50W units, 12” x 12” x .059”

Aluminum panel.

Maximum ohmic values:

See chart.

Overload: 5 times rated wattage

for 5 seconds.

Temperature coefficient:

Under 1Ω: ±90 ppm/°C

1 to 9.99Ω: ±50 ppm/°C

10Ω and over: ±20 ppm/°C.

Dielectric withstanding voltage:

5W and 10W rating,1000 VAC;

25 and 50W ratings, 2250 VAC.

O R D E R I N G I N F O R M A T I O N

Series

805 = 5 Watt

810 = 10 watt

825 = 25 watt

850 = 50 watt

Ohms

R005= 0.005Ω

R10 = 0.1Ω

1R0 = 1.0Ω

250 =

250Ω

1K0 = 1,000Ω

1K5 = 1,500Ω

25K = 25,000Ω

RoHS

Compliant

Tolerance

F = 1%

J = 5%

Non-Inductive Winding

Optional (blank = std. winding)

As of September 2006,

the 89 Series is no longer

offered as Mil. Spec.

Check product availability at

www.ohmite.com