CHIP
RESISTORS
www.vishay.com For technical questions, contact: efi@vishay.com Document Number: 61025
42 Revision: 12-Mar-08
SFN
Vishay Electro-Films
NiCr Thin Film, Top-Contact Resistor
The SFN series resistor chips offer a combination of
nichrome stability, good power rating and small size.
The SFNs are manufactured using Vishay Electro-Films
(EFI) sophisticated thin film equipment and manufacturing
technology. The SFNs are 100 % electrically tested and
visually inspected to MIL-STD-883.
FEATURES
•Wire bondable
•Chip size: 20 inches square
•Resistance range: 10 Ω to 510 kΩ
•Resistor material: Nichrome
•Oxidized silicon substrate
•250 mW power
APPLICATIONS
Vishay EFI SFN resistor chips are widely used in hybrid packages where space is limited. Designed with capacity to handle
substantial power loads, they also have the benefit of nichrome stability.
Recommended for hermetic environments where die is not exposed to moisture.
Product may not
be to scale
TEMPERATURE COEFFICIENT OF RESISTANCE, VALUES AND TOLERANCES
PROCESS CODE
CLASS H* CLASS K*
208 209
200 201
202 203
204 205
*MIL-PRF-38534 inspection criteria
20 Ω1 kΩ
0.1 %
Tightest Standard Tolerance Available
± 25 ppm/°C
± 100 ppm/°C
± 50 ppm/°C
± 10 ppm/°C
50 Ω100 Ω510 kΩ
STANDARD ELECTRICAL SPECIFICATIONS
PARAMETER
Noise, MIL-STD-202, Method 308
100 Ω - 250 kΩ
< 100 Ω or > 251 kΩ
- 35 dB typ.
- 20 dB typ.
Stability, 1000 h, + 125 °C, 50 mW ± 0.25 % max. ΔR/R
Operating Temperature Range- 55 °C to + 125 °C
Thermal Shock, MIL-STD-202, Method 107, Test Condition F ± 0.25 % max. ΔR/R
High Temperature Exposure, + 150 °C, 100 h ± 0.5 % max. ΔR/R
Dielectric Voltage Breakdown 200 V
Insulation Resistance 1012 min.
Operating Voltage100 V max.
DC Power Rating at + 70 °C (Derated to Zero at + 175 °C) 250 mW
5 x Rated Power Short-Time Overload, + 25 °C, 5 s ± 0.25 % max. ΔR/R
CHIP
RESISTORS
Document Number: 61025 For technical questions, contact: efi@vishay.com www.vishay.com
Revision: 12-Mar-08 43
SFN
NiCr Thin Film, Top-Contact Resistor Vishay Electro-Films
DIMENSIONS in inches
SCHEMATIC
Options: Aluminum pads
Passivation (thermal set plastic)
Consult Applications Engineer
TYPICAL RANGE
7.5 kΩ - 510 kΩ
0.004
0.020
0.020
0.004
TYPICAL RANGE
56 Ω - 7.4 kΩ
0.004
0.008
TYPICAL RANGE
10 Ω - 55 Ω
0.004
0.014
MECHANICAL SPECIFICATIONS in inches
PARAMETER
Chip Size 0.020 x 0.020 ± 0.003 (0.51 x 0.51 ± 0.05 mm)
Chip Thickness 0.010 ± 0.002 (0.254 ± 0.05 mm)
Chip Substrate Material Oxidized silicon, 10 kÅ minimum SiO2
Resistor Material Nichrome (passivation optional)
Bonding Pad Size 0.004 x 0.004 (0.10 x 0.10 mm)
Number of Pads 2
Pad Material 15 kÅ minimum gold
Backing None, lapped semiconductor silicon; Au back optional
ORDERING INFORMATION
Example: 100 % visual, 10 kΩ, ± 1 %, ± 50 ppm/°C TCR, gold pads, class H visual inspection
W
INSPECTION/
PACK AGING
W = 100 % visually inspected
parts in matrix tray per
MIL-STD-883
X = Sample, commercial
visually inspected parts loaded in
matrix trays (4 % AQL)
SFN
PRODUCT
FAMILY
202
PROCESS
CODE
See Process Code
table
1000
RESISTANCE
VALUE
Use the first 4
significant digits
of the resistance
1
MULTIPLIER
CODE
B = 0.01
A = 0.1
0 = 1
1 = 10
2 = 100
3 = 1000
4 = 10 000
F
TOLERANCE
CODE
B = 0.1 %
C = 0.2 %
D = 0.5 %
F = 1.0 %
G = 2.0 %
H = 2.5 %
J = 5.0 %
K = 10 %
*Coating standard
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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Vishay
All product specifications and data are subject to change without notice.
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(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
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