sp20f-470rji Welwyn Components, sp20f-470rji Datasheet

sp20f-470rji

Manufacturer Part Number

sp20f-470rji

Description

General-purpose Failsafe Moulded Wirewound Resistors

Manufacturer

Welwyn Components

Datasheet

1.SP20F-470RJI.pdf (2 pages)

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Resistive Element

All resistor types have resistance alloy winding on a braided

fibreglass substrate. Intermediate silicone coatings are used to

enhance processibility and to provide protection to the

resistive element.

Termination

The SP20 and SP20F resistors are terminated using an alloy

coated copper flashed steel lead welded to a cap of the same

material. This termination assembly is mechanically crimped,

utilizing an improved crimp design, to the resistive element.

General-Purpose Failsafe

Moulded Wirewound Resistors

SP20/SP20F Series

•

Electrical Data

Physical Data

General Note

Welwyn Components reserves the right to make changes in product specification without notice or liability.

All information is subject to Welwyn’s own data and is considered accurate at time of going to print.

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Type

EIA RS-344 Style

MIL-R-11 Style

Resistance Range

Tolerance

Power rating

Maximum continuous working voltage

Minimum insulation resistance

Minimum dielectric withstanding volts

Reduced pressure

Hotspot temperature rise

Current noise

Dimensions (mm)

Type

SP20

SP20F

Drop-in replacement for BW20/BW20F

Predictable fusing characteristics

1 watt rated with 1/2 watt dimensions

0.1 ohm to 1200 ohms

Weldable and solderable magnetic leads

9.91±0.25

3.56±0.20

· Bedlington, Northumberland NE22 7AA, UK

0.813±0.05

38.1±3.2

ohms

watts

ATM

RMS

wet

dry

Encapsulation

The SP20 and SP20F are encapsulated utilizing a compression

molded phenolic plastic material. The SP20F has a flame

resistance coating applied over the resistive element to

provide flammmability protection when destructive overloads

may occur.

Marking

All products are marked utilizing heat and solvent resistant

colour code bands consistent with EIA/MIL requirements. The

first band is double width to designate wirewound

construction. A fifth band, blue in colour, is used for

flameproof identification.

Derating to 0 at 160°C

0.75 at 70°C

0.5 at 100°C

0R1 to 1k2

1 at 50°C

SP20

120°C at 1 watt

10,000 Meg

RC20/RC32

Negligible

100 Meg

±5, ±10

CRU 1

Welwyn Components

700V

450V

Derating to 0 at 160°C

0.75 at 70°C

0R1 to 1k

1 at 50°C

SP20F

TT electronics plc

A subsidiary of

Issue B · 03.02

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sp20f-470rji Summary of contents

Page 1

... Termination The SP20 and SP20F resistors are terminated using an alloy coated copper flashed steel lead welded to a cap of the same material. This termination assembly is mechanically crimped, utilizing an improved crimp design, to the resistive element. ...

Page 2

... SP20F <1000 ppm. SP20 Power Derating Ambient Temperature (°C) SP20F Typical Fusing Time (seconds) Ordering Procedure Example: SP20F at 470 ohms and 5% tolerance tape packed on a reel of 4000 pieces – Type Value (use IEC62 code) Tolerance (use IEC62 code ...

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