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Электронный компонент: 307C1364

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Document Number: 23088
Revision 14-May-02
www.vishay.com
10
307C Lighting Thermistors
Vishay Cera-Mite
ceramite.support@vishay.com
FEATURES
Electrode preheat thermistors for use in compact
fluorescent lamps (CFL) and electronic ballasts.
Current limiting, time-delayed start-up extends lamp life.
Quiet, flicker-free operation.
Developed in cooperation with leading ballast designers.
Both standard and custom parts are available.
Economical, reliable and proven in millions of lamps
throughout the world.
APPLICATION CONSIDERATIONS
Ignition time can be optimized to increase life of lamp.
PTC resistance (R
25
) is chosen, along with filament
resistance and application voltage, to control desired
electrode preheat current.
Lamp preheat time is determined by time required for
thermistor to switch from low to high resistance state.
Preheat currents shown result in switch times of
approximately 1 second at 25
C. Lower currents result in
longer switch times.
FLUORESCENT LAMP
C
PTC
RESISTANCE
INSTANTANEOUS
CONTINUOUS
PREHEAT
D
R
25
VOLTAGE
VOLTAGE
CURRENT
MAX.
PART
(OHMS)
(V
RMS
)
(V
RMS
)
(mA)
(mm)
NUMBER
150
265
80
215
4.5
307C1407
150
280
200
200
4.5
307C1414
50
175
50
430
5.5
307C1230
70
265
150
350
5.5
307C1654
100
260
95
370
5.5
307C1364
125
230
80
280
5.5
307C1259
150
235
90
260
5.5
307C1253
200
320
145
300
5.5
307C1223
240
350
150
260
5.5
307C1171
300
400
165
225
5.5
307C1225
380
410
170
205
5.5
307C1390
600
420
120
185
5.5
307C1252
600
460
200
170
5.5
307C1224
850
450
340
140
5.5
307C1622
100
340
265
390
7
307C1403
150
340
150
400
7
307C1306
180
350
165
380
7
307C1569
200
355
265
300
7
307C1375
300
370
75
270
7
307C1242
300
420
320
230
7
307C1360
500
480
400
190
7
307C1361
800
530
450
155
7
307C1362
850
520
175
190
7
307C1260
70
210
50
750
8.5
307C1367
70
300
140
725
8.5
307C1366
85
210
50
670
8.5
307C1363
150
400
100
550
8.5
307C1287
85
280
60
820
10
307C1258
100
310
90
750
10
307C1365
400
430
120
420
10
307C1422
PTC THERMISTORS FOR ELECTRONIC FLUORESCENT BALLASTS
5mm
max
Tinned Copper Clad Steel Wire
24 AWG when D
8.5mm
22 AWG when D
10mm
Note 1: R
25
- Nominal zero power resistance
25% at 25
C. For given diameter, higher resistance thermistors offer higher maximum voltages.
Note 2: Instantaneous Voltage - Maximum rms voltage permitted across thermistor during fluorescent lamp start-up cycle.
Note 3: Continuous Voltage - Maximum rms voltage continuously applied across thermistor during normal lamp operation.
Note 4: Preheat Current - rms current (60Hz) which switches thermistor to high resistance in approximately 1 second at 25
C ambient.
Note 5: Size (mass) of PTC influences rate of I
2
R temperature increase. For given resistance, larger thermistors have longer switch times.
Optional coating slightly increases switch time.
Note 6: P/N suffix (not shown) describes wire lead forms and other options.
32mm min
4.5mm
max.
LS = 5mm
D
Options:
High Temperature Coating
Short Clipped Leads
Other Wire Forms and Lead
Spacings
1
2
3
4
5
6
PTC Thermistors For Electronic Fluorescent Ballasts