VFB2028N
Vishay Foil Resistors
Ultra High Precision Z-Foil BGA Surface Mount Resistor 4R Network,
Temperature Coefficient Tracking 0.1 ppm/°C, Load Life Ratio
Stability to ± 0.01 % (100 ppm), ESD Immunity to 25 kV
FEATURES
Temperature coefficient of resistance (TCR):
Absolute: ± 0.05 ppm/°C typical (0 °C to + 60 °C)
± 0.2 ppm/°C typical (- 55 °C to + 125 °C, + 25 °C
ref.)
Tracking: 0.1 ppm/°C typical
Power coefficient tracking “R due to self heating”: 5 ppm
at rated power
Power rating: 0.2 W per resistor at 70 °C
Resistance tolerance match: 0.01 %
Ratio stability: 0.01 % (0.2 W at 70 °C, 2000 h)
Large variety of resistance ratios: 100
to 30 k
Electrostatic discharge (ESD) up to 25 000 V
Short time overload
0.01 % (100 ppm)
Non inductive, non capacitive design
Rise time: 1 ns effectively no ringing
Thermal stabilization < 1 s
Current noise: < - 40 dB
Voltage coefficient: < 0.1 ppm/V
Non inductive: < 0.08 µH
Non hot spot design
Terminal (solder ball) available: lead (Pb)-free
tin/lead alloy
Compliant to RoHS directive 2002/95/EC
Maximum working voltage for each element: (P x R)
1/2
Weight: 74 mg
For better performances please contact us
INTRODUCTION
Bulk Metal
®
Z-foil technology out-performs all other resistor
technologies available today for applications that require
ultra-high precision and ultra-high stability. The Z-foil
technology provides a significant reduction of the resistive
element’s sensitivity to ambient temperature variations
(TCR) and to self heating when power is applied (power
coefficient).
Model VFB2028N offers low TCR (both absolute and
tracking), low PCR tracking, excellent load life stability, tight
tolerance, excellent ratio stability, and low current noise, all
in one package. 0.05 ppm/°C absolute TCR removes errors
due to temperature gradients.
The VFB2028N ball grid array (BGA) surface mount
4-resistor network provides tight tolerance matching and
TCR tracking between 4 resistors simultaneously etched on
one piece of foil on a common substrate. The electrical
specifications of this integrated construction offers improved
performances and better real estate utilization over discrete
resistors and matched pairs.
Our application engineering department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.
TABLE 1 - POPULAR RESISTANCE VALUES/RATIO AND TCR CHARACTERISTICS
POPULAR VALUES
AVAILABLE
(1)
(R1/R2/R3/R4)
10K/10K/10K/10K
15K/15K/15K/15K
20K/20K/20K/20K
25K/25K/25K/25K
30K/30K/30K/30K
RESISTANCE
VALUE CODE
V0008
V0355
V0300
V0311
V0356
TCR MAX. (MIL RANGE)
ABSOLUTE
TRACKING
TOLERANCE
ABSOLUTE
MATCH
(R1/R2 and R3/R2)
2.0 ppm/°C
0.5 ppm/°C
0.02 %
0.01 %
Note
(1)
For other values and ratios, please contact sales engineering department:
foil@vishaypg.com
TABLE 2 - TYPICAL PERFORMANCE SPECIFICATIONS PER MIL-PRF-55342
TEST
Thermal shock, 5 x (- 65 °C to + 150 °C)
Low temperature operation, - 65 °C at P
nom.
45 min
Short time overload, 6.25 x P
nom.
x 5 s
High temperature exposure, 100 h at + 150 °C
Resistance to soldering heat per MIL-PRF-55342
Moisture resistance MIL-STD-202, method 106 without load
Load life (ratio stability), + 70 °C for 2000 h
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63157
Revision: 29-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
R
0.01 % (100 ppm)
0.01 % (100 ppm)
0.01 % (100 ppm)
0.01 % (100 ppm)
0.01 % (100 ppm)
0.05 % (500 ppm)
0.01 % (100 ppm)
Ratio
0.01 % (100 ppm)
0.005 % (50 ppm)
0.01 % (100 ppm)
0.01 % (100 ppm)
0.01 % (100 ppm)
0.02 % (200 ppm)
0.01 % (100 ppm)
VFB2028N
Vishay Foil Resistors
FIGURE 1 - CHIP CONFIGURATION
High Purity Alumina
Substrate
Resistive Bulk
®
Metal Foil
Solder
Ball
Protective
Coating
Bottom View
Top View
Schematic Diagram
R1
R2
10K X 4
R3
R4
Marking
TABLE 3 - DIMENSIONS
in Inches (Millimeters)
Chip Dimensions
C1
ØD
ØS
Recommended Solder Pad Dimensions
C1
C2
C2
W
C2
C2
C2
C2
L
L
0.280 ± 0.005
(7.12 ± 0.13)
W
0.195 ± 0.005
(4.95 ± 0.13)
ØD
0.020 ± 0.002
(0.50 ± 0.05)
C1
0.246 ± 0.002
(6.25 ± 0.05)
C2
0.050 ± 0.002
(1.27 ± 0.05)
ØS
0.018 ± 0.002
(0.46 ± 0.05)
THICKNESS
(with balls)
0.032 ± 0.003
(0.81 ± 0.08)
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For any questions, contact:
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Document Number: 63157
Revision: 29-Mar-10
VFB2028N
Vishay Foil Resistors
FIGURE 2 -TRIMMING TO VALUES
(Conceptual Illustration)
Interloop Capacitance
Reduction in Series
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Mutual Inductance
Reduction due
to Change in
Current Direction
Note:
Foil shown in
black,
etched spaces in
white
FIGURE 3 - DERATING CURVE
PERCENT OF RATED POWER 100
%
= 0.2 W
Percent of Rated Power
125
100
75
50
25
0
- 75 - 50 - 25
0
25
50
75 100 125 150
- 55 °C
+ 70 °C
Rated Power
Ambient Temperature (°C)
FIGURE 4 - TYPICAL TCR CURVE Z-FOIL
+ 500
+ 400
+ 300
+ 200
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
- 55
- 25
0
+ 25
+ 60 + 75
+ 100 + 125
- 0.16 ppm/°C
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
Ambient Temperature (°C)
Document Number: 63157
Revision: 29-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
3
VFB2028N
Vishay Foil Resistors
TABLE 4 - GLOBAL PART NUMBER INFORMATION
(1)(3)
NEW GLOBAL PART NUMBER: Y1681V0355QT9W (preferred part number format)
DENOTES PRECISION
Y
VCODE
(2)
RESISTANCE
VALUE CODE
TOLERANCE MATCH
T
= 0.01 %
Q
= 0.02 %
A
= 0.05 %
PACKAGING
R
= tape and reel
W
= waffle pack
Y
1
6
8
1
V
0
3
5
5
Q
T
9
W
PRODUCT CODE
1681
= VFB2028N
RESISTANCE TOLERANCE
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.10 %
C
= ± 0.25 %
CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1681 V0355 Q T 9 W:
TYPE: VFB2028N
VALUES: 15K/15K/15K/15K
ABSOLUTE TOLERANCE: ± 0.02 %
TOLERANCE MATCH: 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: waffle pack
HISTORICAL PART NUMBER: VFB2028N 15K/15K/15K/15K Q T S W (will continue to be used)
VFB2028N
MODEL
15K/15K/15K/15K
RESISTANCE
VALUE
R
1
= 15 k
R
2
= 15 k
R
3
= 15 k
R
4
= 15 k
Q
ABSOLUTE
TOLERANCE
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.10 %
C
= ± 0.25 %
T
TOLERANCE
MATCH
T
= 0.01 %
Q
= 0.02 %
A
= 0.05 %
S
TERMINATION
S
= lead (Pb)-free
B
= tin/lead
W
PACKAGING
T
= tape and reel
W
= waffle pack
Notes
(1)
For non-standard requests, please contact application engineering.
(2)
For list of value codes see table 1 (additional values are available on request).
(3)
Can be mounted on SMN(Z) land pattern.
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For any questions, contact:
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Document Number: 63157
Revision: 29-Mar-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and conditions of
purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms
and conditions of purchase.
To the maximum extent permitted by applicable law, Vishay Precision Group
disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability,
including without limitation special, consequential or incidental damages, and (iii) any and all implied
warranties, including warranties of fitness for particular purpose, non-infringement and merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different applications
and performance may vary over time. Statements regarding the suitability of products for certain types of
applications are based on Vishay Precision Group’s knowledge of typical requirements that are often placed on
Vishay Precision Group products. It is the customer’s responsibility to validate that a particular product with the
properties described in the product specification is suitable for use in a particular application.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or by
any conduct of Vishay Precision Group.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless otherwise
expressly indicated. Customers using or selling Vishay Precision Group products not expressly indicated for use
in such applications do so entirely at their own risk and agree to fully indemnify Vishay Precision Group for any
damages arising or resulting from such use or sale. Please contact authorized Vishay Precision Group personnel
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Product names and markings noted herein may be trademarks of their respective owners.
Document No.: 63999
Revision: 27-Apr-11
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