BeStar FT-21.5T-4.0A12 User Manual

SPECIFICATION

FOR PIEZO ELECTRIC BUZZER

Customer

Date
Page

TOTAL PAGE

06 Mar. 09

01 of 05

05

www.be-star.com

Model Name

Product No.Customer P/N
Issue No.
Issue Date

FT-21.5T-4.0A12

BS/TEY01.094A

09/03/06

Approval:

1.Electrical characteristics

2.Dimension

3.Characteristics

4.Measuring Method

5.Reliability Test

6.History Change Record

Drawn by

Checked by

Approved by

Customer approved

BESTAR ELECTRONICS INDUSTRY CO.,LTD

No.199 HuangHe West Road.New district,ChangZhou,JiangSu Province,P.R.China

Tel: [phone] Fax: [phone]

E-mail:[e-mail] http://www.be-star.com

FT-21.5T-4.0A12

H

1.Electrical characteristics

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G

1. Resonant Frequency 4.0±0.5K Hz

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2. Resonant Impedance 200max.ohm

3. Capacitance at 120Hz 100±30%nF

4. Input Voltage ≤30Vp-p

5. Operating Tmperature -20...+60°C

F

F

6. Storage Temperature -20...+70 °C

7. Metal Material Brass

8. Pull test of silver layer(vertical) 2.5N min

E

9. Pull test of silver layer (horizontal) 20N min

E

10. Meshed Wire 8×2×0.05

2.Drawing

D

Ø21.5±0.05

Ø20±0.5

and shall not be used in whole or in part without its written content

3±0.5

0.35±0.1

0.1±0.02

D

This print and information there in are proprietary to Bestar Electronics Industry Co., Ltd.

C

B

09/03/06

A

A

Rev.

Date Drawn

6 5

Brass

Ceramic

silver layer

汤浩君

60±1.0

Note

Date:
Drawn by:
Checked by:
Approved by:

09/03/06

汤浩君

赵 峥
李红元

www.be-star.com [e-mail]

34

FT-21.5T-4.0A12

Piezo Ceramic Element

DRG NO: BS/TEY01.094A

2 1

Page:02 of 05

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B

A

FT-21.5T-4.0A12

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3.Characteristics:

3.1 Solderability
280 10 CTemperaure of Merited Solder,2 0.5sec Duration of Dipping.

3.2 Lead pull off test

G

a) Wire to be soldered on ceramic at the edge. It should withstand minimum 20N force applied in 180° .The wire
should not come out before this .The ceramic can be either glued on a surface of can be held in hand.(Fig.3.2)
b) Wire to be soldered on ceramic at the edage&should be pulled up at 90° The element should be hold on
bottom and wire should be pulled up .It should withstand at least for 2.8N force(Fig.3.1)

156 4 3 2

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G

F

Fig.3.1 Direction of Lead Wire

90°

Lead Wire

Fig.3.2 Direction of Lead Wire

Lead Wire

F

4.Measuring Method

E

D

and shall not be used in whole or in part without its written content

This print and information there in are proprietary to Bestar Electronics Industry Co., Ltd.

C

4.1.Resonant Frequency/ Resonant Impedance:
Piezoelectric disc shall be clamped at a node or edge point ,figure to be free from any mechanical
stresses,and measure its resonant frequency and resonant impedance by using vector impedance analyzer
or equivalent.
Input frequency shall be swept within 1 to 5 kHz, where the resonant frequency is defined and the frequency
where the impedance shows minimum value, this impedance shall be the resonant impedance.

4.2.Capacitance:
A electrostatic capacity capacitance shall be measured at 120Hz by using LCR meter, such as DF2812A
LCR number bridge or equivalent. The part shall be clamped in the same way as the measurement of
resonant frequency / resonant impedance mentioned in section 4.1.

4.3.Insulation Resistance:

E

D

C

An insulation resistance shall be measured by using an insulation resistance meter,suach as DF2863
insulation resistance meter.

4.4.Measureing Condition:
Parts shall be measured under a condition(Temperature:+5 C to +35 C,Humidity:45 to 85% R.H.)

B

B

unless the standard condition(Temperature:+25 3 C,Humidity:60 10%R.H.)is redulated to
measure.

Date:
Drawn by:

09/03/06

A

A

Rev.

汤浩君

DrawnDate

Note

56

Checked by:
Approved by:

www.be-star.com [e-mail]

4 3

09/03/06

汤浩君

赵 峥
李红元

FT-21.5T-4.0A12

Piezo Ceramic Element

DRG NO: BS/TEY01.094A

A

Page:03 of 05

12

FT-21.5T-4.0A12

H

5.Reliability Test:

5.1.High Temperature Test

G

F

E

Temperture +90 C
Duration 240hrs

5.2.Low Temperature Test
Temperature -20 C
Duration 240hrs

5.3.Temperature Cycle Test

-20 C
30min

all these tests above should be measured after leaving normal temperature for 2hrs.

Cycles 5

5.4.Humidity
Temperature 40 2 C
Relative Humidity 90~95R.H.
Duration 240hrs

+20 C

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+90 C

+20 C

F

15min30min15min

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5.5.Vibration Test
Vibration Frequency 10~55Hz
Amplitude 1.52mm
Duration 2 hrs each of 3 axis

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5.6.Shock

D

Piezoelectric disc shall be measured after applying shock at (980m/s2) for each three mutually
perpendicular (XYZ) directions by half sine waves,3 times each

and shall not be used in whole or in part without its written content

This print and information there in are proprietary to Bestar Electronics Industry Co., Ltd.

C

B

C

B

Date:

Drawn by:

09/03/06

B

A

Rev.

汤浩君

DrawnDate

Note

56

Checked by:
Approved by:

www.be-star.com [e-mail]

4 3

09/03/06

汤浩君

赵 峥
李红元

FT-21.5T-4.0A12

Piezo Ceramic Element

DRG NO: BS/TEY01.094A

A

Page: 04 of 05

12

6 5 4 3

FT-21.5T-4.0A12

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6.History change record

2 1

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version
No.

Before After

A

F

E

D

Change Items

Date

09/03/06

Drawn

汤浩君

Approved

GG

李红元

F

E

D

and shall not be used in whole or in part without its written content

This print and information there in are proprietary to Bestar Electronics Industry Co., Ltd.

C

B

Date:

Drawn by:

09/03/06

A

A

Rev.

Date

汤浩君

Drawn

Note

Checked by:
Approved by:

www.be-star.com [e-mail]

09/03/06

汤浩君

赵 峥
李红元

346 5

FT-21.5T-4.0A12

Piezo Ceramic Element

DRG NO: BS/TEY01.094A

2 1

Page: 05 of 05

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A