Ultra-High Value Precision Resistors

3810 Series

General Note

TT Electronics reserves the right to make changes in product specification without notice or liability.

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

© TT Electronics plc

www.ttelectronics.com/resistors

BI Technologies IRC Welwyn

Ultra-High Value

Precision Resistors

3810 Series

Ultra-High Value

Precision Resistors

3810 Series

© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK

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

Issue D · 03.06

Welwyn Components

Application Notes

Each resistor is packed with a card stating nominal resistance

value at 20±1°C with 100 V applied, selection tolerance,

date and serial number.

Although the glass envelope is an excellent insulant and

would be adequate in a dry atmosphere, the condensation

which occurs in a normal atmosphere will provide a shunt

resistance which will modify the very high resistance value. To

minimise this effect all units are coated with silicone, and it is

essential that this coating is not damaged; any handling

should be by the terminations. For the same reason solvents

must not be used.

The resistors should not be used in a damp atmosphere. If

moisture develops on the body the resistor should be dried

for 30 minutes at 70°C and allowed to cool for a further 30

minutes in a dry atmosphere.

To avoid damage to the seal between terminations and glass,

the leads must be fully supported inside the point of bending

during any preforming.

Guard Band

For details of how to use the guard band, fitted to resistors of

100 G ohms and over,

Non-standard versions

Units without glass envelopes but with lacquer protection are

available, but will have a limited electrical performance.

Measured values at a voltage other than 100V may be

recorded.

Packaging

Each resistor is individually packed in a polythene envelope

together with a card carrying measurement details and serial

number (See Application Notes).

For non-standard items contact TT Electronics.

Voltage coefficient of resistance

ppm/volt

100M

Ω

1T

Ω

100T

Ω

3810

-20

-160

3811

-10

-80

3812

-10

-80

-150

Measured at voltages

of 100 and 500 volts

Ordering Procedure

Example: 3812 at 10 teraohms and 2% tolerance -

3 8 1 2 – 1 0 T G I

Type

Value (use IEC62 code)

Tolerance (use IEC62 code)

F

1%

J 5%

G

2%

K 10%

Packing

I

Individual/Bulk

Standard

Load at rated voltage: 1000 hours at 20°C

∆R%

∆R%

∆R%

pF

pF

3810

3811

1

2

0.2

0.4

0.2

<0.1

Maximum

Typical

Shelf life: 12 months at room temperature

1

Resistance to solder heat

Capacitance

Performance Data

0.5

07.16

General Note

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

© TT Electronics plc

www.ttelectronicsresistors.com

BI Technologies IRC Welwyn

see

http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/literature/3810_AN.pdf

https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Applica-

tion-Note/Glass-Sealed-Ultra-High-Value-Resistors.pdf

04.23

Ordering Procedure

Example: 3812-10TGI (3812, 10 teraohms ±2%, Pb-free)

3

8

1

2

-

1

0

T

G I

1

2

3 4

1

2

3

4

Type

Value

Tolerance

Packing & Finish

3810 E24 = 3/4 characters

M = megohms

G = gigohms

T = teraohms

F = ±1% I = Bulk pack, Pb-free

3811

G = ±2%

3812

J = ±5%

K = ±10%

M = ±20%

OBSOLETE(3812 only)