Document Number: 29071
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
Revision: 30-Nov-05
167
PTC Thermistors, Time Delay For Lighting
2381 66. 93... / PTCLL..P.....E
Vishay BCcomponents
PTC thermistor
MBC425 - 2
36 kHz
lamp
supply
rectified mains
(310 V d.c. for
230 V a.c. mains)
fluorescent
lamp
C
C
C
FET
switch
L
FET
switch
cathode cathode
FEATURES
Reliable starting, time and time again
Accurate resistance for ease of circuit design
Small size and durable
Available bulk-packed or taped-on-reel
Long life: more than 20000 starts for a 20 W lamp
Low self-inductance for high frequency applications.
Component in accordance to RoHS 2002/95/EC and
WEEE 2002/96/EC
APPLICATIONS
Domestic electronics
Industrial electronics
DESCRIPTION
The conventional fluorescent strip lamp is rapidly being
superseded by a more compact fluorescent lamp in which
the old troublesome starter is replaced by an electronic
ballast circuit which pre-heats the cathode to make ignition
easy.
Positive Temperature Coefficient (PTC) thermistors for
overload protection have proved to be the ideal electronic
ballast component for companies worldwide.
When the rectified mains is first applied, the PTC thermistor
is cold, so its resistance is low. The lamp voltage will be
below the necessary ignition value, so the current will flow
through the cathodes, heating them to their emission
temperature. At the same time, the PTC thermistor will heat
up to its switch temperature, whereupon its resistance will
rise rapidly, allowing the lamp voltage to reach its ignition
value and light the lamp.
Once the lamp is lit, the cathodes are fed by a high-frequency
(36 kHz) lamp supply, to avoid flicker, via two power FET
switches. The PTC thermistor plays no further part until the
lamp is switched off, whereupon it is ready to resume its
smooth-starting function.
We supply a range of overload PTC thermistors for this
application offering a wide choice of voltage and switch
temperatures.
MOUNTING
The leads are suitable for soldering in any position. The
lacquer may cover the leads up to 1.0 mm from the seating
plane.
PACKING
All tape and reel specifications are in accordance with "IEC
60286-3".
Notes
1. Ignition time of the lamp approximately equals the tripping time.
2.
Specific for PLC-E lamp electronic starter.
3.
Specific for HF-TL ballast.
ELECTRICAL DATA AND ORDERING INFORMATION
R
25
(
)
SWITCH
TEMPERATURE
(
C)
MAXIMUM
VOLTAGE
(PEAK VALUE)
(V)
TYPICAL
1)
TRIP TIME at 25
C
CATALOG NUMBER
MIN.
MAX.
tt
(s)
at I
t
(mA)
12 NC
SAP CODING
500
750
110
700
0.4
200
2381 660 93049
2)
PTCLL05P131TBE
2)
185
300
120
700
0.5
300
2381 660 93055
2)
PTCLL05P211TTE
2)
75
125
80
700
0.7
300
2381 660 93066
2)
PTCLL05P251TTE
2)
225
375
105
900
0.75
300
2381 661 93102
3)
PTCLL07P261VTE
3)
75
125
105
1000
0.85
500
2381 661 93114
3)
PTCLL07P421WTE
3)
Typical electronic ballast circuit.
www.vishay.com
For technical questions contact: nlr.europe@vishay.com
Document Number: 29071
168
Revision: 30-Nov-05
2381 66. 93... / PTCLL..P.....E
Vishay BCcomponents
PTC Thermistors, Time Delay For Lighting
DIMENSIONS in millimeters
COMPONENT DIMENSIONS
MAX.
DIAMETER
MAX.
THICKNESS
H
3
WEIGHT
(g)
FIGURES
PACKING
SPQ
CATALOG NUMBER
12 NC
SAP CODING
5.4
4.5
10
0.33
Fig. a
bulk
500
2381 660 93049
PTCLL05P131TBE
5.4
4.5
9
0.45
Fig. b
on tape
1500
2381 660 93055
PTCLL05P211TTE
5.4
4.5
10
0.45
Fig. b
on tape
1500
2381 660 93066
PTCLL05P251TTE
7.0
5.0
12
0.66
Fig. b
on tape
1500
2381 661 93102
PTCLL07P261VTE
7.0
5.0
12
0.66
Fig. b
on tape
1500
2381 661 93114
PTCLL07P421WTE
Dimensions of the reel
D
T
L
1
H
3
H
2
F
d
Fig. a
P
T
H
2
H
3
h
L
d
P
0
P
1
F
D
0
W
0
W
2
W
1
W
P
T
1
t
H
1
H
0
P
D
h
22.5
30
+ 1
- 0
77
85.6
92
356
max.
18
3
42 1
56 max.
Fig. b
Document Number: 29071
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
Revision: 30-Nov-05
169
2381 66. 93... / PTCLL..P.....E
PTC Thermistors, Time Delay For Lighting
Vishay BCcomponents
CHARACTERISTICS CONCERNING TAPED THERMISTORS
PARAMETER
VALUE
Minimum pull out force of the component
5 N
Minimum pull off force of adhesive tape
6 N
Minimum tearing force tape
15 N
Maximum pull off force tape-reel
5 N
STORAGE CONDITIONS
Storage temperature range
- 25 to + 40
C
Maximum relative humidity
80 %
TAPE AND OTHER DEVICE DIMENSIONS in millimeters
SYMBOL
PARAMETER
DIMENSIONS
TOLERANCE
REMARKS
D
body diameter
see table Component Dimensions
T
total maximum thickness
see table Component Dimensions
d
lead diameter
0.6
10 %
P
pitch between thermistors
12.7
1
P
0
feed hole pitch
12.7
0.3
cumulative pitch error
1 mm/20 pitches
P
1
feed hole centre to lead centre
3.81
0.7
guaranteed between
component and tape
h
component alignment
0
1.3
F
lead to lead distance
5
+ 0.6 /- 0.1
guaranteed between
component and tape
h
component alignment
0
2
W
tape width
18
+ 1.0 /- 0.5
W
0
hold down tape width
12.3
-
W
1
hole position
9
0.5
W
2
hold down tape position
3.0
-
H
2
component body to seating
plane
4
1
H
3
component top to seating plane
see table Component Dimensions
H
0
lead-wire clinch height
16
0.5
D
0
feed hole diameter
4
0.2
t
total tape thickness
0.9
-
with cardboard tape
0.5 0.1 mm
L
length of snipped lead
11
-
Legal Disclaimer Notice
Vishay
Document Number: 91000
www.vishay.com
Revision: 08-Apr-05
1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
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