81F20R datasheet, PDF - EEWORLD Datasheet

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81F20R: DescriptionWirewound Resistors - Through Hole 1watt 20ohm 1% Axial; CategoryPassive components; File Size291KB，2 Pages; ManufacturerOhmite; Websitehttps://www.ohmite.com

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81F20R Overview

Wirewound Resistors - Through Hole 1watt 20ohm 1% Axial

81F20R Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Ohmite
Product Category	Wirewound Resistors - Through Hole
RoHS	N
Resistance	20 Ohms
Power Rating	1 W
Tolerance	1 %
Temperature Coefficient	20 PPM / C
Voltage Rating	150 V
Operating Temperature Range	+ 25 C to + 275 C
Diameter	3.2 mm
Length	11.1 mm
Termination Style	Axial
Packaging	Bulk
Product	Power Resistors Wirewound Silicone Coated
Technology	Wirewound
Type	Wirewound Resistor
Mounting Style	PCB Mount
Maximum Operating Temperature	+ 275 C
Minimum Operating Temperature	+ 25 C
Factory Pack Quantity	10

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Commercial Grade Acrasil

‚ Silicone-Ceramic

Conformal Axial Terminal Wirewound

1% Tolerance (5% available)

80 series

rW series

F e at u r e s

Military Grade 80 Series MIL-R-26 Qualified

Ohmite’s highest quality conformal axial terminal

silicone-ceramic coated resistors for applications

requiring high precision and stability. These resistors

have a low temperature coefficient and maintain a

high degree of stability under demanding conditions.

• Designed for precision power applications

• All-welded construction

• RW Series “Mil” value resistors marked with

“Mil” in accordance with MIL-R-26 specifica-

tions

s e r i e s s p e C i F i C at i o n s

Commercial Grade

81F

83F

83J

85F

85J

80F

80J

Military Grade

RW70U

RW79U

RW69V

RW74U

RW67V

RW78U

RW68V

Watts

Ohms

0.1-6K

0.1-8K

0.1-20K

0.1-75K

0.1-150K

Voltage

150

100

200

460

1000

Non-Inductive versions available. Insert “N” before tolerance code. Example: 83NF2K21

CharaCteristiCs

Coating

Silicone-ceramic

Core

Ceramic

Terminals

Solder-coated copper clad axial

Derating

Linearly from 100% @ +25°C to 0% @ +275°C.

Tolerance

±5% (J type), ±1% (F type) (other tolerances available)

Power rating

Based on 25°C free air rating

Maximum ohmic values

See chart

Overload

Under 5 watts: 5 times rated wattage for 5 seconds. 5 watts and over: 10 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

500 VAC: 1 watt rating; 1000 VAC: 2, 3, 5, 7, and 10 watt rating

Dimensions

(in./mm max.)

Watts

Length

0.406 / 10.3

0.437 / 11.1

Diam.

0.219 / 5.6

0.125 / 3.2

Lead gauge

1.5 in. /

38.1mm

85F

85J

80F

80J

83F

83J

81F

RW70U

RW79U

RW69V

0.593 / 15.1

0.937 / 23.8

1.842 / 46.8

0.218 / 5.5

0.343 / 8.7

0.406 /10.3

RW74U

RW67V

RW78U

RW68V

(continued)

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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