www.vishay.com
105
VHP-3, VHP-4, VPR247
Vishay Foil Resistors
Document Number: 63005
Revision 08-Mar-05
THROUGH HOLE
For technical questions in the Americas, contact foilsupport1@vishay.com
For technical questions in Asia/Japan/Europe/Africa/Israel, contact foilsupport2@vishay.com
• ISRAEL: foilsales.israel@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • AMERICAS: foilsales.usa@vishay.com
• ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com • GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com
SALES
Bulk Metal® Foil Technology
Hermetically Sealed Power and Current Sensing Resistors
*Weight of VHP-3 and VHP-4 = 15 grams Max.
VPR247 = 7 grams Max.
† Available only up to 500 ohms
See last page in this data sheet for numbered footnotes.
RESISTANCE TIGHTEST TCR
RANGE (Ω)
RESISTANCE TOLERANCE
1
50 to 80K ± 0.01% ± 5ppm/°C
25 to < 50 ± 0.02% ± 7ppm/°C
10 to < 25 ± 0.05% ± 10ppm/°C
5 to < 10 ± 0.1% ± 13ppm/°C
2 to < 5 ± 0.25% ± 20ppm/°C
1 to < 2 ± 0.5% ± 25ppm/°C
0.5 to < 1 ± 1.0%
0.25 to < 0.5 ± 2.0% ± 50ppm/°C
0.1 to < 0.25 ± 5.0%
RESISTANCE TIGHTEST TCR
RANGE (Ω)
RESISTANCE TOLERANCE
1
10 to 500 ± 0.01% ± 5ppm/°C
5 to <10 ± 0.02% ± 6ppm/°C
2 to < 5 ± 0.05% ± 8ppm/°C
1 to < 2 ± 0.1% ± 10ppm/°C
0.5 to < 1 ± 0.25% ± 15ppm/°C
0.25 to < 0.5 ± 0.5% ± 20ppm/°C
0.1 to < 0.25 ± 1.0% ± 25ppm/°C
0.05 to < 0.1 ± 2.0% ± 30ppm/°C
TABLE 2 - VHP-4 AND VPR247 SPECIFICATIONS*†
Vishay Bulk Metal® Foil power resistors offer the best approach
to low value power and current sensing when a combination of
accuracy, tight TCR, low thermal EMF, low voltage coefficient,
Kelvin connection, and long term stability (under power) are
required.
Vishay Models VHP-3 and VHP-4 offer all welded construction
and screw mounting directly to a metal heat sink for maximum
heat transfer. Hermetic sealing and nitrogen back fill provide
the maximum protection against environmental stresses. Long
term stability is thereby ensured. A special feature of this
construction is Kovar eyelet’s and OFHC solder plated copper
leads providing the lowest thermal EMFs in the industry.
Vishay Model VPR247 has many of the advantages of
the VHP-4 but with significantly reduced size and weight.
FEATURES
• Temperature Coefficient of Resistance
Nominal TCR3:
+ 0.6ppm/°C (0°C to + 25°C); – 0.6ppm/°C (+ 25°C to + 60°C);
+ 2.2ppm/°C (– 55°C to + 25°C); – 1.8 ppm/°C (+ 25°C to + 125°C)
Standard TCR Spread from Nominal4:
± 1.5ppm/°C (0°C to + 25°C and + 25°C to + 60°C);
± 2.0ppm/°C (– 55°C to + 25°C and + 25°C to + 125°C)
Maximum TCR Spread from Nominal5:
± 2.5ppm/°C (0°C to + 25°C and + 25°C to + 60°C);
± 2.3ppm/°C (– 55°C to + 25°C and + 25°C to + 125°C)
• Selected TCR Tracking: 0.5ppm/°C
• Load-Life Stability:
± 0.01% Max ∆R, 3 watts on heat sink at + 25°C, 2000 hrs.
± 0.05% Max ∆R, 10 watts on heat sink at + 25°C, 2000 hrs.
± 0.05% Max ∆R, 3 watts in still air at + 25°C, 2000 hrs.
• Shelf Life Stability: 5ppm/year
• Power Rating: 10 W, heat sink, + 25°C; 3 W, free air,
+ 25°C
• Resistance Tolerance (Initial Resistance Accuracy):
± 0.01% tightest to ± 5.0% loosest
• Resistance Range: 0.05Ω to 80KΩ
• Current Noise: < 0.010µV (RMS)/Volt of Applied Voltage
• Thermal EMF: 0.1µV/°C (lead effect), 2.5µV/watt (power
effect)
• Non-Inductive Design: Standard
TABLE 1 - VHP-3* SPECIFICATIONS
Product may not
be to scale
Document Number: 63005
Revision 08-Mar-05
www.vishay.com
106
VHP-3, VHP-4, VPR247
Vishay Foil Resistors
THROUGH HOLE
For technical questions in the Americas, contact foilsupport1@vishay.com
For technical questions in Asia/Japan/Europe/Africa/Israel, contact foilsupport2@vishay.com
• ISRAEL: foilsales.israel@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • AMERICAS: foilsales.usa@vishay.com
• ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com • GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com
SALES
FIGURE 2 - KELVIN CONNECTION
r1r2
I1I2
r3r4
R
Im
r5∞
0
FIGURE 1 - POWER DERATING CURVE
+100
+75
+50
+25
0
Ambient Temperature (°C)
Percent of Rated Power
–55°CRated Power
-75 -50 -25 0 +25 +50 +75 +100 +125 +150 +175
Please specify Vishay VHP-3, VHP-4 and VPR247 series resistors as follows:
Example: VHP-3 500R00 0.01%
MODEL NO. RESISTANCE VALUE TOLERANCE
Resistance Value, in Ω, is expressed by a series of 6 characters, 5 of which represent significant digits while the 6th is a dual purpose
letter that designates both the multiplier and the location of the comma or decimal.
RESISTANCE LETTER MULTIPLIER
RANGE DESIGNATOR FACTOR EXAMPLE
0.05Ω to < 1KΩR x 1 100R01 = 100.01Ω
1KΩ to < 80KΩKx 10
315K231 = 15,231Ω
TABLE 4 - ORDERING INFORMATION
TABLE 3 - GENERAL SPECIFICATIONS
Stability
Load Life 2,000 hrs.
Shelf Life
Power Rating
At + 25°C
At Ambient Temperature (See Fig.3)
Current Noise
High Frequency Operation
Rise/Decay Time
Inductance (L)8
Capacitance (C)
Voltage Coefficient
Operating Temperature Range
Hermeticity
Maximum Working Voltage10
Thermal EMF11
± 0.05% maximum ∆R, 3 watts in still air @ + 25°C
± 0.05% maximum ∆R under full rated power
(10 W @ + 25°C on heat sink)
± 0.0005% (5ppm) maximum ∆R/year
10 watts or 3 amps6— heat sink7
3 watts or 3 amps6— free air
< 0.010µV (RMS)/Volt of applied voltage
(– 40dB)
1.0ns at 1KΩ
0.1µH maximum; 0.08µH typical
1.0pF maximum; 0.5pF typical
< 0.1ppm/V9
– 55°C to + 150°C
10-7 Atmospheric cc/sec maximum
600 V
0.1µV/°C maximum (lead effect)
2.5µV/watt maximum (power effect)
Bulk Metal® Foil Technology
Hermetically Sealed Power and Current Sensing Resistors
Kelvin, 4-terminal, connections are utilized for these low ohmic value products to measure a precise voltage drop across the
resistive element. In these applications the contact resistance, lead resistance, and their TCR effect may be greater than that
of the element itself and could cause significant errors if the standard 2-terminal connection is used. Figure 2 shows a high
impedance measurement system where r5 approaches infinity and Im approaches zero resulting in negligible IR drop through r3
and r4 which negates their lead resistance and TCR effect. With the voltage sense leads E1 and E2 inside of r1 and r2 the
resistance and TCR effect of the current leads, I1 and I2 are negated and only the resistance and TCR of the element R are
sensed. This method of measurement is essential for precise current sensing.
www.vishay.com
107
VHP-3, VHP-4, VPR247
Vishay Foil Resistors
Document Number: 63005
Revision 08-Mar-05
THROUGH HOLE
For technical questions in the Americas, contact foilsupport1@vishay.com
For technical questions in Asia/Japan/Europe/Africa/Israel, contact foilsupport2@vishay.com
• ISRAEL: foilsales.israel@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • AMERICAS: foilsales.usa@vishay.com
• ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com • GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com
SALES
Case not active; insulators not required; mounting hardware not supplied.
0.140 ± 0.005
(Dia. Thru Hole)
C
W
LL
L
Date Code
10
Week
01
Year
VISHAY
VPR247
XXXX
0R2000 1%
H
SA
LS
Tolerance
Resistance
Value Gold Plated
Copper Leads
0.025 Dia
I
1
E
1
E
2
I
2
B
0.010 max
Sleeve Extension
DIMENSION INCHES MM
L0.690 ± 0.005 17.53 ± 0.13
H0.820 ± 0.005 20.83 ± 0.13
W0.215 ± 0.005 5.46 ± 0.13
LL 0.500 Min 12.70 Min
LS 0.100 ± 0.005 2.54 ± 0.13
S0.200 ± 0.005 5.08 ± 0.13
A0.120 ± 0.005 3.05 ± 0.13
B0.040 ± 0.005 1.02 ± 0.13
C0.120 ± 0.005 3.05 ± 0.13
Mounting
Hole
0.156 dia (3.9)
± 0.005 (± 0.13)
VHP-3
0.665 (16.89)
± 0.005 (± 0.13)
1.186 (30.13)
± 0.005 (± 0.13)
1.530 (38.86)
± 0.005 (± 0.13)
VHP-4 (4 terminal)
Mounting
Hole
0.222
(5.64)
E1
E2
I1I2
Standard Marking
Arrangement
Model No.
Res. Val.
Res. Tol.
Date Code
Ex: 98 02
Year Week
VISHAY
VHP-3
21K500
± 0.01%
9802
E1E2
I1I2
TO-3 cap
TO-3 base
0.040 (1.00) dia
± 0.005 (± 0.13
)
0.43 (10.92)
± 0.01 (± 0.25)
1.00 (25.4)
± 0.005 (± 0.13)
0.770 (19.56)
max dia
0.266 (6.76)
± 0.005 (± 0.13)
0.335 (8.51)
± 0.005 (± 0.13)
0.45 (11.43)
min.
0.156 dia (3.9)
± 0.005 (± 0.13)
0.665 (16.89)
± 0.005 (± 0.13)
1.186 (30.13)
± 0.005 (± 0.13)
1.530 (38.86)
± 0.005 (± 0.13)
FIGURE 3 - VHP-3, VHP-4 STANDARD IMPRINTING AND DIMENSIONS in inches (millimeters)
FIGURE 4 - VPR247 STANDARD IMPRINTING AND DIMENSIONS
Bulk Metal® Foil Technology
Hermetically Sealed Power and Current Sensing Resistors
Document Number: 63005
Revision 08-Mar-05
www.vishay.com
108
VHP-3, VHP-4, VPR247
Vishay Foil Resistors
THROUGH HOLE
For technical questions in the Americas, contact foilsupport1@vishay.com
For technical questions in Asia/Japan/Europe/Africa/Israel, contact foilsupport2@vishay.com
• ISRAEL: foilsales.israel@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • AMERICAS: foilsales.usa@vishay.com
• ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com • GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com
SALES
Method MIL-R-39009B VHP-3, VHP-4 and
Paragraph
12
∆
R Limits VPR247
Typ2
∆
R Test Data16
Test Group I
Conditioning 4.7.2 ± 0.2% + 0.05Ω± 0.03%
Test Group II
Resistance Temperature 4.7.4 < 1Ω:
See Tables 1 & 2, Page 20
Characteristic13 ± 100ppm/°C;
(– 55°C to + 125°C) 1Ω to 19.6Ω:
± 50ppm/°C;
≥ 20Ω:
± 30ppm/°C
High Temperature14
(2 hrs. @ + 150°C) 4.7.5 ± 0.5% + 0.05Ω± 0.01%
Low Temperature Storage 4.7.17 ± 0.3% + 0.05Ω± 0.005%
DWV
(300 V @ atmospheric pressure)
4.7.6 ± 0.2% + 0.05Ω± 0.005%
Insulation Resistance 4.7.7 104MΩ> 104MΩ
Low Temperature Operation
4.7.8 ± 0.3% + 0.05Ω± 0.01%
Momentary Overload15
(5 sec. @ 15 watts) 4.7.9 ± 0.3% + 0.05Ω± 0.03%
Moisture Resistance 4.7.10 ± 0.5% + 0.05Ω± 0.02%
Terminal Strength 4.7.11 ± 0.2% + 0.05Ω± 0.005%
Test Group III
Shock - Medium Impact
(Post-test DWV @ 300 V) 4.7.12 ± 0.2% + 0.05Ω± 0.005%
Vibration - High Frequency
(Post-test DWV @ 300 V) 4.7.13 ± 0.2% + 0.05Ω± 0.005%
Test Group IV
Life Test
10 W @ 25°C for 2,000 hrs. 4.7.14 ± 1.0% + 0.05Ω± 0.01%
80% power @ + 70°C
for 2,000 hrs ––– ––– ± 0.04%
Test Group V
High Temperature Exposure
2,000 hrs. @ + 150°C 4.7.15 ± 1.0% + 0.05Ω± 0.05%
TABLE 5 - ENVIRONMENTAL PERFORMANCE
NOTES:
1. Standard resistance tolerances— ± 0.01%; ± 0.02%; ± 0.05%;
± 0.1%; ± 0.25% ± 0.5%; ± 1.0%; ± 2.0%; ± 5.0% (± 0.005%
tolerance available on special order).
2. Maximum is 1.0% A.Q.L. standard for all specifications except
TCR. (For TCR information, see notes 3-5). Typical is a
designers reference which represents that 85% of the units
supplied, over a long period of time, will be at least the figure
shown or better.
3. Vishay Nominal TCR is defined as the chord slopes of the
relative change of resistance/temperature, expressed in ppm
(parts per million), called (RT) curve from 0°C to
Bulk Metal® Foil Technology
Hermetically Sealed Power and Current Sensing Resistors
+ 25°C and + 25°C to + 60°C (“Instrument” Range); and
from – 55°C to + 25°C and + 25°C to + 125°C ("Military”
Range). These specifications and the definition of Nominal
TCR apply to all resistance values including low-value
resistors.
4. Vishay Standard TCR Spread is defined as a designers
reference which represents that at least 92% of the units,
and 82% of the lots, supplied by Vishay will be within the
stated band centered on the nominal curve. This definition
of the Vishay Standard TCR Spread from Nominal applies
to all resistance values. However, as the resistance value
decreases below 80Ω, the Vishay Standard TCR Spread from
Nominal specification starts to increase. (See Fig. 3 in
data sheet “7 Technical Reasons to Specify Vishay Bulk
Metal® Foil Resistive Components.”)
5. Vishay Maximum TCR Spread is defined as the 3 σ (Sigma)
limit of a normal Gaussian distribution (99.73% of a production
lot) which is within a band, centered on the nominal curve.
This Vishay Maximum TCR Spread is no greater than
± 2.5ppm/°C from nominal throughout the full temperature
range. This definition of the Vishay Maximum TCR Spread
from Nominal applies to all resistance values. However, as
the resistance value decreases below 80Ω, the Vishay
maximum TCR Spread from Nominal specification starts to
increase. (See Fig. 3 in data sheet “7 Technical Reasons to
Specify Vishay Bulk Metal® Foil Resistive Components.”)
6. Whichever is lower.
7. Heat sink chassis dimensions and requirements per
MIL-R-39009/1B:
8. Inductance (L) due mainly to the leads.
9. The resolution limit of existing test equipment (within the
measurement capability of the equipment, or “essentially
zero”).
10. Not to exceed power rating of resistor.
11. µV/°C relates to EMF due to lead temperature difference and
µV/watt due to power applied to the resistor.
12. Vishay test data as compared to MIL-R-39009 is shown for
illustration purposes, Vishay test conditions that deviate from
the Mil test method are noted within parentheses.
13. Maximum specifications. See Tables 1 and 2 in data sheet
“VHP-3, VHP-4, VPR2347.”
14. Maximum ambient temperature rating is + 150°C.
15. Maximum overload rating is 15 Watts (5 x rated power in free
air; 1.5x rated power on heatsink), with applied voltage not
to exceed 750V.
16. ∆R’s are as shown plus 0.001 ohms to allow for measurement
errors at low resistance values.
INCHES MM
L 6.00 152.4
W 4.00 101.6
H 2.00 50.8
T 0.04 1.0
