PRODUCT BULLETIN
MF-SERIES
GENERAL PURPOSE METAL FILM RESISTORS
Small Size
Low Cost
0.5%, 1.0%, 5.0%
Resistance Tolerance
100, 50 & 25 PPM
Temperature Coefficient
Conformal Coating
Color Band Marking
Tape & Reel Packaging
WILLOW TECHNOLOGIES LTD.
SHAWLANDS COURT, NEWCHAPEL ROAD
LINGFIELD, SURREY, RH7 6BL, ENGLAND
Tel. + 44 (0) 1342 835234 Fax. + 44 (0) 1342 834306
E-mail
rob@willow.co.uk
Website
http://www.willow.co.uk
Dimensions
Type
MF-12
MF-25
MF-50
Max. L.
In Inches
Max. Dia.
Lead Dia.
Lead L.
.984
.984
.984
.984
.984
.146 ±.016 .059 ±.008 .017 ±.002
.256 ±.020 .091 ±.008 .0236 ±.0004*
.354 ±.039 .138 ±.020 .0236 ±.0004*
.472 ±.039 .177 ±.020 .031 ±.002
.630 ±.039 .217 ±.020 .031 ±.002
Lead L.
MF-100
MF-200
Max L.
Max. Dia.
Lead Dia.
* MF-25 & MF-50 ARE ALSO AVAILABLE WITH .022 IN. DIAMETER LEADS
Dimensional
Correlation
in.
.0004
.017
.022
.0236
.025
.031
.059
.091
.138
.146
.177
.217
.256
.354
.472
.630
.984
Specifications
Type
MF-12
MF-25
MF-50
MF-100
MF-200
Power Rating
at 70°C
T100 & TC50
Range (Ohms)
51.1
5.11
5.11
5.11
5.11
511
2.4
2.4
2.4
5.11
mm
.01
.45
.56
.60
.63
.80
1.50
2.30
3.50
3.70
4.50
5.50
6.50
9.00
12.0
16.0
25.0
TC25
Range (Ohms)
100
5.11
5.11
5.11
5.11
100
511
1
1
1
Voltage
Voltage
Max. Working Max. Overload
1/8 W
1/4 W
1/2 W
1W
2W
200 V
250 V
350 V
500 V
500 V
400 V
500 V
700 V
1000 V
1000 V
LEAD TAPE PACKAGING PER EIA RS-296
Available Resistance Values
0.5% = E192
1% = E96
5% = E24 & E48
How to Order
Sample Part Number
MF-25
T100
100K
1%
Resistance Tolerance
Resistance Value
Temperature Coefficient
Type
DEDICATION TO EXCELLENCE
Subject to change without notice
Continued on reverse side
REV C
12/27/99
Characteristic
Specification
Test Method
(All resistance measurements should be
performed after stabilization or
conditioning periods.)
MIL-STD-202
Method 303
MIL-STD-202
Method 304
MIL-STD-202
Method 301
1/8W 300V 1 minute
1/4W 500V 1 minute
1/2W 700V 1 minute
1, 2W 750V 1 minute
MIL-STD-202
Method 302
100V 1 minute
MIL-STD-202
Method 308
MIL-STD-202
Method 201
10~ Hz
X.Y.Z. 3 directions
2 hours each.
MIL-STD-202
Method 211
MIL-STD-202
Method 210
350°C, 3 ±0.05 seconds
MIL-STD-202
Method 208
230°C, 5 seconds
MIL-STD-202
Method 107
-55°C, +155°C
5 cycles
MIL-R-10509
Para, 4.6.6
2.5 times rated working
voltage, 5 seconds
MIL-STD-202
Method 103
40°C, RH 95% 500
MIL-R-10509
Para 4.6.5
Rated working
voltage, @ -65°C 45 minutes.
MIL-STD-202
Method 108
Rated working
Voltage 1 ½ hours on. ½ hour
off for total 1000 hours
MIL-STD-202
Method 215
DC RESISTANCE
TEMPERATURE
COEFFICIENT
DIELECTRIC
STRENGTH
Within specified
tolerance.
As buyer requested
±25PPM/°C ±100PPM/°C
±50PPM/°C ±200PPM/°C
No flashover or
damage
INSULATION
RESISTANCE
CURRENT NOISE
TEST
VIBRATION
At least 1000MΩ
5.11Ω to 9.99Ω less than 0.05µV/V
10Ω to 9.99KΩ less then 0.1µV/V
10KΩ to 1MΩ less then 0.2µV/V
∆R
within ±(0.25% + 0.05Ω)
TERMINAL
STRENGTH
RESISTANCE TO
SOLDERING HEAT
SOLDERABILITY
No broken or loosened
terminals.
∆R
within ±(0.25% + 0.05Ω)
At least 95% coverage
∆R
within ±(0.5% + 0.05Ω)
THERMAL SHOCK
SHORT TIME
OVERLOAD
∆R
within ±(0.05% + 0.05Ω)
HUMIDITY
∆R
within ±(1% + 0.05Ω)
NO mechanical damage
∆R
within ±(0.5% + 0.05Ω)
LOW TEMPERATURE
OPERATION
LOAD LIFE
∆R
within ±(1% + 0.05Ω)
RESISTANCE TO
SOLVENT
Color bands legible.
No mechanical damage.
CURRENT NOISE
u
V/V
1.0
0.32
0.10
0.032
0.010
0.003
10
100
1K
10K
100K
dB
0
-10
-20
-30
-40
-50
1M
Nominal Resistance
(Ω)
REV D
1/20/99