General-Purpose Failsafe

Moulded Wirewound Resistors

SPH/SPF Series

(custom TC’s available)

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

93

Type

F

P

S

H

P

S

EIA RS-344 Style

CRU2

MIL-R-11 Style

RC32/RC42

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Maximum continuous working voltage

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Current noise

Negligible

Electrical Data

Issue B · 03.02

A subsidiary of

TT electronics plc

Welwyn Components

Dimensions (mm)

Type

L

D

d

f

SPH

14.3 ±0.25

5.72 ±0.20

0.813 ±0.05

38.1 ±3.2

SPF

14.3 ±0.25

5.72 ±0.20

0.813 ±0.05

38.1 ±3.2

Physical Data

L

D

f

d

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 SPH and SPF 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.

Encapsulation

The SPH and SPF are encapsulated utilizing a compression

moulded phenolic plastic material. The SPF 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.