PCR Datasheet, PDF (1/2 Pages) Welwyn Components Limited – Precision Thick Film Surface Mounted Resistors

Precision Thick Film
Surface Mounted Resistors
PCR Series
• Tolerance down to 0.1%
• Excellent load stability
• Termination available for wire bonding or
soldering
• Resistance range 10 ohms to 1M ohms
• Any resistance value available within
specified range
Welwyn Components
Electrical Data
Power rating at 70°C
Resistance range
Limiting element voltage
TCR -55°C to +155°C
TCR +20°C to +70°C
Resistance tolerance
Values
Thermal impedance
Ambient temperature range*
*See Application Notes
watts
ohms
volts
ppm/°C
ppm/°C
%
°C/watt
°C
PCR0805 PCR1005 PCR1206
0.1
0.125
0.25
10R to 1M
100
150
200
100
50
0.1, 0.25, 0.5, 1
E24 & E96 preferred
360
290
200
-55 to 155
Notes
Any value to order
For 10 devices mounted
on a 50 x 25 mm p.c.b. area
Physical Data
Dimensions of standard styles (mm) & Weight (g)
Wrap around
Style
L
W
T
A
B*
0805 2.0 ± 0.3 1.25 ± 0.2 0.6 0.3 ± 0.15 0.9min
1005 2.5 ± 0.3 1.25 ± 0.2 0.7
Not available
1206 3.2 ± 0.4 1.6 ± 0.2 0.7 0.4 ± 0.2 1.7min
planar
C
0.3 ± 0.1
0.4 ± 0.15
0.4 0.15
Wt
0.009
0.015
0.020
A
B
L
A
T
W
Wrap-around terminations
(3 faces)
Alternative styles for surface
mounting resistors
C
C
T
L
W
Planar terminations
*This dimension determines the number of conductors which may pass under the surface mounted device.
Construction
Thick film resistor material, overglaze and organic protection
are screen printed on a 96% alumina substrate.
Adjustment
The components are adjusted to final value using a specially
developed technique, which assures optimum load stability
performance.
Terminations
Planar (or single-sided) termination is gold and suitable for
wire-bonding; wrap around is 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 30 seconds.
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: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue D · 08.04
33