AT25LSD datasheet(36/60 Pages) KNOWLES

36 / 60 page

www.knowlescapacitors.com

Glass and Quartz Trimmers - Specifications

Design Features

The unique Voltronics non-rotating precision trimmer capacitor

design offers the following advantages over conventional rotating

types:



Linear tuning with no reversals



A true high frequency device with high Q’s, low RF losses, low

constant inductance and high self-resonant frequencies



A superior seal because the screw head and O-ring do not move

in and out



Greater life - 10,000 cycles minimum



Much smaller sealed MIL sizes



Ability to provide extended metal or plastic shafts

General Specifications

(where not specified on detail pages)

Dielectric

The dielectric is a tube which has been precision drawn in a vacuum

so that its inner diameter is held within ±0.0002”. The choices are:

1. Annular Band Glass: A solid tube of a specially selected

formulation of glass which is metallized on the outside.

2. Embedded Band Glass: Two tubes of glass fired together

with a metallized silver band embedded between them.

The inner tube is only 0.005” thick to provide much higher

capacitance values.

3. Quartz: A pure-grade silicon oxide offering higher Q and

voltage ratings in each size with the trade-off of lower

capacitance and higher cost.

Piston Action

Non-rotating.

Blind Hole Tuning

Screw head does not move in and out.

Linearity

± 1% with no capacitance reversals.

Resolution

#2-72 tuning screw for fine tuning - approximate pico-farads

per turn in active tuning range:

1. Annular band glass

0.6 to 0.8

2. Embedded band glass

2.3 to 3.0

3. Quartz

0.3 to 0.36

4. “H” Series high range glass 3.9 to 4.2

Insulation Resistance

Annular band glass and quartz:

106 MΩ at 25°C to 125°C

Embedded band glass:

106 MΩ at 25°C

105 MΩ at 125°C

Tuning Torque

1 to 8 inch ounces.

Life

Over 10,000 cycles.

Temperature Coefficient

Annular Band Glass:

±50 ppm/°C

Embedded Band Glass: ±150 ppm/°C

Quartz:

0 to +50 ppm/°C

Dielectric Withstanding Voltage

Twice DC working voltage (listed with each part).

Capacitance Tuning Range

From below minimum to above maximum value listed for each

part. Capacitance measured at 1 MHz on Boonton Electronics 7600

bridge using Voltronics V1265 guarded test jig. AM measurements

taken with leads perpendicular to unit regardless of final

configuration.

Temperature Range

All glass dielectrics: -55°C to 125°C

Quartz dielectric:

-55°C to 150°C

Other Specifications

All other specifications including vibration, shock, moisture and seal

(where applicable) per MIL-C-14409D.

Drawing Tolerances (where not specified)

Decimal: XXX ±.016”

XX ±.03”

Quality Factor

Recommended Tuning Tools: TT-100 or TT-600

% of Q at 1MHz

Frequency (MHz)

100

100 120

100

100 120

Frequency (MHz)

ANNUALAR BAND CAPACITORS

EMBEDDED BAND CAPACITORS

4.5

- 12pF

18pF

30pF

10 - 16p

28 - 36p

60 - 75p

90 - 120pF

a Knowles Precision Devices brand

AT25LSD 数据表(PDF) 36 Page - Knowles Electronics

AT25LSD 数据表(HTML) 36 Page - Knowles Electronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

数据表下载