VFP-3, VFP-4
Bulk Metal
®
Foil Technology Power
and Current Sensing Resistors with TCR of 2 ppm/°C,
Tolerance to ± 0.01 % and power up to 10 W
FEATURES
Temperature Coefficient of Resistance (TCR):
± 2 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C Ref.) (see Tables 1 and 2)
Tolerance: to ± 0.01 % (see Tables 1 and 2)
Power Rating (heat-sinked): 10 W
Load Life Stability: ± 0.005 % at 25 °C,
2000 hours at Rated Power
Resistance Range: 0.05
to 80 k
Electrostatic Discharge (ESD) above 25 000 V
Non Inductive, Non Capacitive Design
Rise Time: 1 ns without Ringing
Current Noise: < - 40 dB
Thermal EMF: 0.05 µV/°C typical
Voltage Coefficient: < 0.1 ppm/V
Non Inductive: < 0.08 µH
Non Hot Spot Design
Terminal Finishes Available: Lead (Pb)-free
Tin/Lead Alloy
Any Value available within Resistance Range (e.g.
1K2345)
Prototype Samples available from 48 hours. For more
Information, please contact Alpha
For better Performances, please see VFP-3Z and VFP-4Z
Datasheets
Any value available within resistance range
The basic features of Bulk Metal
®
Foil resistors; tight
resistance tolerance, fast response time, low TCR, and
exceptional long-term stability, are available for power-circuit
applications. Typical applications are non-inductive design,
current sensing applications, deflection amplifiers, constant
current power supplies, forced balance electronic scales,
graphic display computers, character generation on CRTs,
and electron beam controls.
Our Application Engineering Department is available to
advise and to make recommendations. For non-standard
technical requirements and special applications, please
contact us.
R
I
I
I
1
E
1
V
E
2
I
2
TABLE 1 - VFP-3
1)
SPECIFICATIONS
RESISTANCE
RANGE ()
50 to 80K
25 to < 50
10 to < 25
5 to < 10
2 to < 5
1 to < 2
0.5 to < 1
0.25 to < 0.5
0.1 to < 0.25
Notes
Tighter tolerance available upon request
See page 3 in this data sheet for numbered footnotes.
1. Weight = 15 g Max
2. VFP-4 available up to 500
.
3. - 55 °C to + 125 °C, + 25 °C Ref.
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 67047
Revision: 10-Mar-14
STANDARD
TOLERANCE
± 0.01 %
± 0.02 %
± 0.05 %
± 0.1 %
± 0.25 %
± 0.5 %
± 1.0 %
± 2.0 %
± 5.0 %
± 50 ppm/°C
± 2 ppm/°C
TYPICAL
TCR
3)
MAXIMUM
TCR
3)
± 5 ppm/°C
± 7 ppm/°C
± 10 ppm/°C
± 13 ppm/°C
± 20 ppm/°C
± 25 ppm/°C
TABLE 2 - VFP-4
1), 2)
SPECIFICATIONS
RESISTANCE
RANGE ()
10 to 500
5 to < 10
2 to < 5
1 to < 2
0.5 to < 1
0.25 to < 0.5
0.1 to < 0.25
0.05 to < 0.1
STANDARD
TOLERANCE
± 0.01 %
± 0.02 %
± 0.05 %
± 0.1 %
± 0.25 %
± 0.5 %
± 1.0 %
± 2.0 %
± 2 ppm/°C
TYPICAL
TCR
3)
MAXIMUM
TCR
3)
± 5 ppm/°C
± 6 ppm/°C
± 8 ppm/°C
± 10 ppm/°C
± 15 ppm/°C
± 20 ppm/°C
± 25 ppm/°C
± 30 ppm/°C
For any questions, contact:
foil@vishaypg.com
www.vishayfoilresistors.com
1
VFP-3, VFP-4
FIGURE 1 - STANDARD IMPRINTING AND DIMENSIONS
in inches (millimeters)
VFP-3
1.575 ± 0.016 (40.01 ± 0.41)
1.181 ± 0.016 (30 ± 0.41)
0.197 (5.00)
0.276
- 0.008
(7.01
- 0.2
)
1.575 ± 0.016 (40.01 ± 0.41)
0.118 (3.00)
1.181 ± 0.016 (30 ± 0.41)
+ 0.004
+ 0.1
VFP-4
0.276
- 0.008
(7.01
- 0.2
)
0.197 (5.00)
0.118 (3.00)
+ 0.004
+ 0.1
VFR
VFP-3
(Value)
(Tol.)
(Date Code)
0.150 ± 0.004
(3.81 ± 0.1)
0.394 ± 0.008
(10.01 ± 0.2)
0.787 ± 0.016
(19.99 ± 0.41)
VFR
VFP-4
(Value)
(Tol.)
(Date Code)
0.150 ± 0.004
(3.81 ± 0.1)
0.394 ± 0.008
(10.01 ± 0.2)
Lead Dia.
0.025 (0.64)
Solder Coated
Copper
0.787 ± 0.016
(19.99 ± 0.41)
Lead Dia.
0.025 (0.633)
Solder Coated
Copper
1.00 Min.
(25.4 Min.)
I1 E1 E2
I2
1.00 Min.
(25.4 Min.)
0.600 (15.24)
0.200 [x3] (5.08)
TABLE 3 - SPECIFICATIONS
Stability
Load Life at 2000 hours
Power Rating
At + 25 °C
10 W or 3 A
1)
on heat sink
2)
3 W or 3 A
1)
in free air
Power rating based on
R.
Further derating not necessary.
Current Noise
High Frequency Operation
Rise Time
Inductance (L)
3)
Capacitance (C)
Voltage Coefficient
Operating Temp. Range
Maximum Working
Thermal
EMF
6)
Voltage
5)
1.0 ns at 1 k
0.1 µH maximum; 0.08 µH typical
1.0 pF maximum; 0.5 pF typical
< 0.1 ppm/V
4)
- 55 °C to + 150 °C
350 V
0.5 µV/°C typical (lead effect)
< 0.010 µV (RMS)/V of applied voltage (- 40 dB)
± 0.05 % maximum
R
under full rated power (3 W at + 25 °C)
FIGURE 2 - POWER DERATING CURVE
FIGURE 3 - TRIMMING TO VALUES
(Conceptual Illustration)
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
- 55 °C
Rated Power
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
0
- 75 - 50 - 25
0 + 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Note:
Foil shown in black, etched spaces in white
www.vishayfoilresistors.com
2
For any questions, contact:
foil@vishaypg.com
Document Number: 67047
Revision: 10-Mar-14
VFP-3, VFP-4
TABLE 4 - POWER RESISTOR ENVIRONMENTAL PERFORMANCE COMPARISON
METHOD
PARAGRAPH
7)
TEST GROUP I
Conditioning
TEST GROUP II
Resistance Temperature Characteristic
(- 55 °C to + 125 °C)
4.8.4
< 1
:
± 100 ppm/°C;
1
to 19.6
:
± 50 ppm/°C;
20
:
± 30 ppm/°C
Low Temp Storage
DWV
(750 V at atmosphere pressure)
Insulation Resistance
Low Temp Operation
Short time Overload
9)
Moisture Resistance
Terminal Strength
TEST GROUP III
Shock - Specified Pulse
Vibration - High Frequency
TEST GROUP IV
Life Test
10 W at + 25 °C for 2000 hours
60 % power at + 70 °C
for 2000 hours
TEST GROUP V
High Temp Exposure
(2000 hours at + 150 °C)
Notes
1. Whichever is lower.
2. Heat sink chassis
MIL-PRF-39009:
dimensions
and
requirements
per
4.8.14
± 1.0 % + 0.01
± 0.03 %
-
-
± 0.05 %
4.8.13
± 1.0 % + 0.01
± 0.05 %
4.8.11
4.8.12
± 0.2 % + 0.01
± 0.2 % + 0.01
± 0.01 %
± 0.005 %
4.8.5
4.8.6
4.8.7
4.8.8
4.8.9
4.8.10
± 0.2 % + 0.01
10
4
M
± 0.3 % + 0.01
± 0.3 % + 0.01
± 0.5 % + 0.01
± 0.2 % + 0.01
± 0.005 %
> 10
4
M
± 0.01 %
± 0.01 %
± 0.05 %
± 0.005 %
4.8.16
± 0.3 % + 0.01
± 0.01 %
See
tables 1 and 2
4.8.2
± 0.2 % + 0.01
± 0.03 %
MIL-PRF-39009
R
LIMITS
VFP-3, VFP-4
MAXIMUM
TEST DATA
10)
5. Not to exceed power rating of resistor.
6. µV/°C relates to EMF due to lead temperature difference and
µV/watt due to power applied to the resistor.
7. VFR test data as compared to MIL-PRF-39009 is shown for
illustration purposes, VFR test conditions that deviate from the
MIL test method are noted within parentheses.
8. Maximum ambient temperature rating is + 150 °C.
9. Maximum overload rating is 15 W (5 x rated power in free air;
1.5 x rated power on heat sink), with applied voltage not to
exceed 750 V.
10.
R’s
are as shown plus 0.001
to allow for measurement errors
at low resistance values.
L
W
H
T
INCHES
6.00
4.00
2.00
0.04
MILLIMETERS
152.4
101.6
50.8
1.0
3. Inductance (L) due mainly to the leads.
4. The resolution limit of existing test equipment (within the
measurement capability of the equipment, or "essentially zero").
Document Number: 67047
Revision: 10-Mar-14
For any questions, contact:
foil@vishaypg.com
www.vishayfoilresistors.com
3
VFP-3, VFP-4
TABLE 5 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y073321K5000T9L (preferred part number format)
DENOTES PRECISION
A
VALUE
R
=
K
= k
AER*
0
= Standard
9
= Lead (Pb)-free
1 - 999
= Custom
A
0
7
3
3
2
1
K
5
0
0
0
T
9
L
PRODUCT CODE
0733
= VFP-3
0734
= VFP-4
RESISTANCE TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
PACKAGING
L
= Bulk Pack
FOR EXAMPLE: ABOVE GLOBAL ORDER A0733 21K5000 T 9 L:
TYPE: VFP-3
VALUE: 21.5 k
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: Lead (Pb)-free
PACKAGING: Bulk Pack
HISTORICAL PART NUMBER: VFP-3T 21K500 T B (will continue to be used)
VFP-3
MODEL
VFP-3
VFP-4
T
TERMINATION
T
= Lead (Pb)-free
None = Tin/Lead alloy
21K500
OHMIC VALUE
21.5 k
T
RESISTANCE
TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
G
= ± 2.0 %
J
= ± 5.0 %
B
PACKAGING
B
= Bulk Pack
Note
* For non-standard requests, please contact Application Engineering.
www.vishayfoilresistors.com
4
For any questions, contact:
foil@vishaypg.com
Document Number: 67047
Revision: 10-Mar-14
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 to obtain written terms and conditions regarding products designed for
such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document No.: 63999
Revision: 27-Apr-2011
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