PR Series

PRODUCT BULLETIN
PR-SERIES
WILLOW TECHNOLOGIES LTD.
SHAWLANDS COURT, NEWCHAPEL ROAD
LINGFIELD, SURREY, RH7 6BL, ENGLAND
Tel. + 44 (0) 1342 835234 Fax. + 44 (0) 1342 834306
E-mail [email protected]
Website http://www.willow.co.uk
ULTRA PRECISION
METAL FILM RESISTORS
Low Temperature
Coefficients
Tight Tolerances
High Stability
Low Noise
CL - CL
MAX L.
Dimensions
Style
LL
LEAD D.
MAX D.
Dimensional Correlation
In.
.016
.025
.062
.072
.102
.125
.150
.161
.170
.200
.280
.300
.400
.416
.450
.600
.685
1.250
1.500
PR1/20B
PR1/10
PR1/8A
PR1/8
PR1/4A
PR1/4
.406
.635
1.57
1.83
2.59
3.18
3.81
4.04
4.32
5.08
7.11
7.62
10.16
10.57
11.43
15.24
17.40
31.75
38.10
Max. L.
Max. Dia.
CL to
CL
Lead
Dia.
Lead
Length
.170
.280
.280
.400
.416
.600
.072
.102
.102
.150
.161
.200
.200
.300
.300
.450
.450
.685
.020 AWG #24
.025 AWG #22
.025 AWG #22
.025 AWG #22
.025 AWG #22
.025 AWG #22
1.25±.065
1.50±.125
1.50±.125
1.50±.125
1.50±.125
1.50±.125
Specifications
Style
mm
In Inches
Resistance Range
Ohms
Power Rating @85 C
Maximum
Voltage
10R-300K
10R-500K
10R-500K
10R-1M
10R-1M
50R-1.5M
1/20
1/10
1/8
1/8
1/4
1/4
200V
300V
300V
400V
400V
500V
PR1/20B
PR1/10
PR1/8A
PR1/8
PR1/4A
PR1/4
Typical Performance (100 ohms – 100K)
% R
Ref: EIA RS-186 (where applicable) % R
Effects Of Solder..............…………........<0.01
1000 Hr. Load Life At 85 C…………. 0.02
Dielectric Withstanding......………….......<0.01
Humidity...……………………………… 0.04
Noise.....…………………..……………..<-30dB
Thermal Shock ......……………….......<0.01
Insulation Resistance ....…...<10000 M. OHM
Short Time Overload...………….........<0.01
Shelf Life ……………………......<50 PPM/YR.
Temperature Coefficients
TC25=0
TC20=0
TC15=0
TC10=0
TC5 =0
25 PPM/
20 PPM/
15 PPM/
10 PPM/
5 PPM/
C – 20 to +85
C – 20 to +85
C – 20 to +85
C – 20 to +85
C – 20 to +85
C
C
C
C
C
Resistance Tolerances
1.0%, 0.5%, .25%, 0.1%,
.05%, .02%, .01%
Lead Material
The core material is O.F.H.C. and is
electroplated with a coating of 60/40 tin/lead.
Matched Sets and Networks
Customized resistance and temperature coefficient matching are available.
Resistance matching to .01% and T.C. tracking of 1 PPM/ C are standard.
Please consult the factory for details on your requirements.
DEDICATION TO EXCELLENCE
Subject to change without notice