3812-10TGI Welwyn Components, 3812-10TGI Datasheet

3812-10TGI

Manufacturer Part Number

3812-10TGI

Description

Ultra-high Value Precision Resistors

Manufacturer

Welwyn Components

Datasheet

1.3812-10TGI.pdf (2 pages)

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Construction

The Cermetox

substrate; brass end caps are forced fitted to the substrate

which is then adjusted to value with a helical cut in the film;

the leads are mechanically locked into the end caps and the

assembly sealed into the glass envelope. All close tolerance

units utilise two resistors connected in series within the glass

envelope. The guard band is described, with application

notes, in a Product Information sheet, available on request.

Terminations

Material

Strength

Solderability The terminations meet the requirements of

Ultra-High Value

Precision Resistors

3810 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

i L

Values

Dimensions (mm) & Weight (g)

Type

3810

3811

3812

Resistance range up to 100 T ohms

(10

Designed for low current (picoampere level)

measurements

Low voltage coefficient

Hermetically sealed

Leakage current minimised by hermetic

sealing and guard ring

s i s

t i

n i

2 (

a t

e i

t n

° 0

e c

e t

e l

ohms)

L max

a r

o t

25.0

42.9

48.0

e l

t n

a r

° 0

a r

resistive film is fired onto high quality ceramic

Solder-coated Dumet wire.

The terminations meet the requirements of

IEC 68.2.21

IEC 115-1, Clause 4.17.3.2

) C

u t

e c

l o

e r

a t

D max

a r

f min

· Bedlington, Northumberland NE22 7AA, UK

d nom

0.6

o v

° /

s t l

mounting

Centres

29.2

47.1

52.2

PCB

Radius

Bend

, 0

Min.

0.6

o t

Wt. nom

Marking

The serial number, resistance value and tolerance code are legend

marked. The resistance value marking conforms to IEC 62.

Solvent Resistance

The glass envelope is coated with silicone and should not be

subjected to solvents or their vapours. (See Application

Notes.)

1.5

2.2

2.5

5 -

E24 preferred

, 1

4 -

, 2

o t

, 5

o t

3 -

Welwyn Components

1T to 10T; 2, 5, 10 >10T; 5, 10

o t

TT electronics plc

Issue D · 03.06

A subsidiary of

203

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3812-10TGI Summary of contents

Page 1

... Construction The Cermetox resistive film is fired onto high quality ceramic ® substrate; brass end caps are forced fitted to the substrate which is then adjusted to value with a helical cut in the film; the leads are mechanically locked into the end caps and the assembly sealed into the glass envelope ...

Page 2

... To avoid damage to the seal between terminations and glass, the leads must be fully supported inside the point of bending during any preforming. Ordering Procedure Example: 3812 at 10 teraohms and 2% tolerance - Type Value (use IEC62 code) Tolerance (use IEC62 code) F ...

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