Surface Mounted
Thermistors
PTCR Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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
09. 11
· TCR’s up to +3500 ppm
· Custom designs available
· Solder terminations have a nickel barrier layer
· Resistance range 10 ohms to 800 ohms
· Tolerances down to 2%
· Available in 0805 and 1206 sizes
Surface Mounted
Thermistors
PTCR Series
•TCR’s up to +3500 ppm
•Custom designs available
•Solder terminations have a nickel barrier layer
•Resistance range 10 ohms to 800 ohms
•Tolerances down to 2%
•Available in 0805 and 1206 sizes
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© 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
Electrical Data
Issue C · 08.04
A subsidiary of
TT electronics plc
Welwyn Components
Commercial PTCR 0805 PTCR 1206 Notes
Power rating at 70°C watts 0.1 0.25
Resistance range ohms 10R to 400R 10R to 800R
Limiting element voltage volts 100 200
TCR -55°C to 155°C ppm/°C See table below
Resistance tolerance at 20°C % 2, 5, 10
Ambient temperature range °C -55 to 155
Values ohms E24 & E96 preferred Any value to order
Thermal impedance °C/watt 360 200 For 10 devices
mounted on a
50 x 25mm p.c.b. area
37
Variation of TCR within Value Range
Value range (ohms) TCR (ppm/°C)
10 to <25 3500 ± 10%
25 to <50 3100 ± 10%
50 to <100 2900 ± 10%
10 to <200 2700 ± 15%
200 to <400 2400 ± 15%
400 to <800 2200 ± 15%
Physical Data
10000
1000
100
10
1
-55 -15 25 65 105 145
Temperature °C
Resistance (ohms)
10R
800R
Dimensions (mm) and weight (g)
Style L W T max A B* Wt nom
0805 2.0 ± 0.3 1.25 ± 0.2 0.6 0.3 ± 0.15 0.9 min 0.009
1206 3.2 ± 0.4 1.6 ± 0.2 0.7 0.4 ± 0.2 1.7 min 0.0090
*This dimension determines the number of conductors which may pass under the surface mounted device.
T
W
A
A
B
L
Wrap-around terminations
(3 faces)
PTCR_C.qxd 8/9/04 4:00 PM Page 1
Surface Mounted
Thermistors
PTCR Series
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
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
09. 11
Maximum Typical
Load at rated power: 1000 hours at 70°C ∆R% 5 1
Shelf life: 12 months at room temperature ∆R% 3 0.5
Derating from rated power at 70°C Zero at 155°C
Dry heat: 1000 hours at 155°C ∆R% 2.5 1
Climatic category 55 / 155 / 56
Long term damp heat ∆R% 3 1
Temperature rapid change ∆R% 2 0.5
Resistance to solder heat ∆R% 2 0.5
Voltage proof volts 500
Surface Mounted
Thermistors
PTCR 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 C · 08.04
Welwyn Components
38
Performance Data
Operating Temperature Range
The chips themselves can operate at a maximum
temperature of 155°C (see performance claims above). For
soldered chips, the joint temperature should not exceed
110°C. This condition is met when the stated power levels
at 70°C are used.
Mounting
This chips resistor is ideally suited for handling by
automatic methods due to its rectangular shape and small
dimensional tolerances. Electrical connection to a ceramic
substrate or to a printed circuit board can be made by flow
or reflow soldering of wraparound terminations. The
terminations provide good ‘leach’ properties and ensure
reliable contact. Due to the robust construction the resistor
chip can be immersed in a solder bath for 10 seconds at
260°C. This enables the resistor to be mounted on one
side of a printed circuit board and wire-leaded components
on the other side.
Construction
Thick film resistor material, overglaze and organic protection
are screen printed on a 96% alumina substrate.
Terminations
Wrap-around terminations are suitable for soldering.
Solderability
Wrap-around terminations have an electroplated nickel barrier
and solder coating. This ensures excellent leach resistance
properties and solderability. They will withstand immersion in
solder at 260°C for 10 seconds.
Marking
All relevant information recorded on the primary package or
reel.
Solvent Resistance
The chips are resistant to all normal industrial cleaning fluids
suitable for printed circuits.
Packing
As standard 3000 chips are supplied taped and reeled on
8mm tape to IEC 286-3.
Application Notes
Type 1206 400R G
Resistance value
(IEC62 code)
Tolerance
(IEC62 code)
Specify type reference, value and tolerance as shown in
this example of PTCR1206 400R 2%:
Ordering Procedure
F 1%
G 2%
J 5%
PTCR_C.qxd 8/9/04 4:00 PM Page 2
