NEW
:
High Precision Surface Mount Current Sensing Chip Resistor with Power
Rating to 1 W, Temperature Coefficient of Resistance of
± 2 ppm/°C and Load Life Stability of ±0.015%
VCS1625P
Vishay Foil Resistors
Document Number: 63216 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jun-11 1
INTRODUCTION
Model VCS1625P is a surface mount resistor designed with
4 pads for Kelvin connection. Utilizing VFR’s (Vishay Foil
Resistors’) Bulk Metal® Foil as the resistance element, it
provides performance capabilities far greater than other
resistor technologies can supply in a product of comparable
size.
The key performance of the new VCS1625P is its high rated
power up to 1W. This small device dissipates heat almost
entirely through the pads so surface mount users are
encouraged to be generous with the board’s pads and
traces. Gold terminations are available on special order.
The four terminal device separates the current leads from the
voltage sensing leads. This configuration eliminates the
effect of the lead wire resistance from points A to B and
C to D.
VFR’s application engineering department is available to
advise and to make recommendations. For non-standard
technical requirements and special applications, please
contact foil@vishaypg.com.
I
A
R
Zin
I
D
V
=
~∞
BC
FEATURES
•Temperature coefficient of resistance (TCR):
± 2 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.) (see table 1)
•Resistance range: 0.01 Ω to 10 Ω (for higher
or lower values, please contact Application
Engineering)
•Vishay Foil resistors are not restricted to standard values,
we can supply specific “as required” values at no extra cost
or delivery (e.g. 1.234 Ω vs. 1 Ω)
•Resistance tolerance: to ± 0.1% (0.05% is also available)
•Load life stability: 0.015 % at 70 °C, 2000 h at rated power
•Electrostatic discharge (ESD) at least to 25 kV
•Short time overload < 0.005 %
•Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
•Power rating: to 1 W at + 70 °C (Figure 1)
•Non inductive: non capacitive design
•Rise time: 1 ns effectively no ringing
•Current rating: 5 A maximum
•Current noise: 0.010 µVRMS/V of applied voltage
(< - 40 dB)
•Voltage coefficient: < 0.1 ppm/V
•Non inductive: < 0.08 µH
•Non hot spot design
•Prototype quantities available in just 5 working days or
sooner
•For better performances, please review the VCS1625ZP
(Z-Foil) datasheet
TERMINATIONS
•Two lead (Pb)-free options are available:
gold plated or tin plated
•Tin/lead plated
FIGURE 1 - POWER DERATING CURVE
100
75
50
25
0
- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Percent of Rated Power
+ 70 °C
- 55 °C
* Pb containing materials are not RoHS compliant, exemptions may apply
TABLE 1 - TOLERANCE AND TCR VS. RESISTANCE VALUE (- 55 °C to + 125 °C, + 25° Ref.)(2)
VALUE (Ω)TOLERANCE TYPICAL TCR MAXIMUM TCR POWER RATING
at + 70 °C (1)
MAXIMUM
CURRENT (1)
> 2R000 to 10R000 0.2 %, 0.5 %, 1 % ± 2 ppm/°C ± 5 ppm/°C
1 W on FR4 PCB 5 A
> 0R500 to 2R000 0.5 %, 1 % ± 2 ppm/°C ± 10 ppm/°C
> 0R100 to 0R500 1 % ± 2 ppm/°C ± 15 ppm/°C
> 0R050 to 0R100 1 % ± 2 ppm/°C ± 20 ppm/°C
> 0R030 to 0R050 1 % ± 2 ppm/°C ± 30 ppm/°C
> 0R010 to 0R030 1 % ± 2 ppm/°C ± 50 ppm/°C
VCS1625P
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63216
2Revision: 13-Jun-11
Notes
(1) Max Power or Max Current - whichever is lower
(2) Tighter performances are available. Please contact application engineering foil@vishaypg.com
FIGURE 2 - DIMENSIONS in Inches (Millimeters)
L
H
WA
B
I2
I1E1
E2
Top View Bottom View
Mounting
Pads (4)
I1E1
I2E2
Electrical
Schematic
R
Solder Pad Layout
0.806 (20.47)
0.806 (20.47)
0.070 (1.78)
0.200 (5.08)
0.020 (0.51)
0.020 (0.51)
0.070 (1.78)
0.260 (6.60)
2 oz. Copper (70 Microns)
Coated by Solder mask
Solder Coated Pads
(Windows in Solder Mask)
INCHES MILLIMETERS
L0.250 ± 0.010 6.35 ± 0.25
H0.160 ± 0.010 4.06 ± 0.25
W0.040 maximum 1.02 maximum
A0.080 ± 0.005 2.03 ± 0.13
B0.040 ± 0.010 1.02 ± 0.25
FIGURE 3 - TRIMMING TO VALUES
(Conceptual Illustration)*
Mutual Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Note: Foil shown in black, etched spaces in white
Interloop Capacitance
Reduction in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Current Path
After Trimming
* To acquire a precision resistance value, the Bulk Metal® Foil chip is trimmed by
selectively removing built-in “shorting bars.” To increase the resistance in known
increments, marked areas are cut, producing progressively smaller increases in
resistance. This method eliminates the effect of “hot spot” and improves the long term
stability of the Foil chips.
FIGURE 4 - TYPICAL RESISTANCE
VERSUS TEMPERATURE
CURVE AND ITS CHORD
SLOPES (TCR)
+ 75
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
Ambient Temperature (°C)
Δ
R
R
(ppm)
± 2 ppm/°C (+ 25 °C reference)
+ 100 + 125- 25 0+ 25+ 50- 50
TABLE 2 - PERFORMANCE SPECIFICATIONS
TEST MIL-PRF-55342
ΔR LIMITS
TYPICAL
ΔR LIMITS
MAXIMUM
ΔR LIMITS (1)
Thermal shock 5 x (- 65 °C to + 150 °C) ± 0.10 % ± 0.005 % (50 ppm) ± 0.01 % (100 ppm)
Low temperature operation, - 65 °C, 45 min at Pnom ± 0.10 % ± 0.005 % (50 ppm) ± 0.01 % (100 ppm)
Short time overload, 6.25 x rated power, 5 s ± 0.10 % ± 0.005 % (50 ppm) ± 0.02 % (200 ppm)
High temperature exposure, + 150 °C, 100 h ± 0.10 % ± 0.01 % (100 ppm) ± 0.02 % (200 ppm)
Resistance to soldering heat ± 0.2 % ± 0.01 % (100 ppm) ± 0.03 % (300 ppm)
Moisture resistance ± 0.2 % ± 0.01 % (100 ppm) ± 0.03 % (300 ppm)
Load life stability 2000 h at 70 °C at 1 W ± 0.5 % ± 0.015 % (150 ppm) ± 0.025 % (250 ppm)
VCS1625P
Vishay Foil Resistors
Document Number: 63216 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jun-11 3
Note
(1) Measurement error 0.001R
POST MANUFACTURING OPERATIONS OR PMO
Military applications can include requirements for
performance under conditions of stress beyond the normal
and over extended periods of time. This calls for more than
just selecting a standard device and applying it to a circuit.
The standard device may turn out to be all that is needed but
an analysis of the projected service conditions should be
made and it may well dictate a routine of stabilization known
as post manufacturing operations or PMO. The PMO
operations that will be discussed are only applicable to Foil
resistors. They stabilize Foil resistors while they are harmful
to other types. Short time overload, accelerated load life, and
temperature cycling are the three PMO exercises that do the
most to remove the anomalies down the road. Foil resistors
are inherently stable as manufactured. These PMO
exercises are only of value on foil resistors and they improve
the performance by small but significant amounts. Users are
encouraged to contact VFR’s application engineering
department for assistance in choosing the PMO operations
that are right for their application.
TABLE 3 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y08561R50000D9W (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS (1)
Y R = Ω0 = standard part, tin/lead termination
9 = standard part, lead (Pb)-free termination
129 = standard part, gold plated
Other = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
0856 = VCS1625P A= ± 0.05 %
B= ± 0.1 %
E= ± 0.2 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
R= tape and reel
W= waffle pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0856 1R50000 D 9 W:
TYPE: VCS1625P
VALUE: 1.5 Ω
ABSOLUTE TOLERANCE: ± 0.5 %
TERMINATION: lead (Pb)-free
PACKAGING: waffle pack
HISTORICAL PART NUMBER: VCS1625P 1R5000 TCR2 D S W (will continue to be used)
VCS1625P 1R5000 TCR2 D S W
MODEL OHMIC VALUE TCR RESISTANCE
TOLERANCE TERMINATION PACKAGING
VCS1625P 1.5 ΩCharacteristic A= ± 0.05 %
B= ± 0.1 %
E= ± 0.2 %
D= ± 0.5 %
F= ± 1.0 %
G= ± 2.0 %
J= ± 5.0 %
S= lead (Pb)-free
B= tin/lead
G= gold plated
T= tape and reel
W= waffle pack
VCS1625P
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63216
4Revision: 13-Jun-11
Note
(1) Application engineering release: for non-standard requests, please contact application engineering.
8561 500RY0 D90 W0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11
