VHD200, VHD144
Vishay Foil Resistors
Bulk Metal® Foil Hermetically sealed, Small Package,
Voltage Dividers with TCR Tracking of 0.1 ppm/°C
and Tolerance Match down to 0.001 %
FEATURES
• Temperature coefficient of resistance (TCR):
Absolute: 2 ppm/°C typical
(- 55 °C to + 125 C, 25 °C ref.)
Tracking: 0.1 ppm/°C typical
Pb-free
Available
RoHS*
COMPLIANT
• Tolerance:
absolute to 0.005 %
match to 0.001 %
• Power rating: VHD144 0.2 W at 70 °C (see table 1)
VHD200 0.1 W at 70 °C (see table 1)
• Ratio stability: < 0.001 % (10 ppm) 0.2 W at 70 °C for 2000 h
• Electrostatic discharge (ESD) above 25 000 V
• Non inductive, non capacitive design
• Rise time: 1 ns without ringing
Any value at any ratio available within resistance range
Vishay Models VHD200 and VHD144 are hermetic versions
of the molded divider 300144. The difference between them
is that the VHD144 has the full power rating of the 300144
while the VHD200 has a reduced power rating in exchange
for a full spectrum of values without the time delay for new
artwork (for values not yet tooled) and without NRE charges.
Further, the VHD200 is oil filled, providing additional
moisture protection and allowing considerable improvement
in ratio match and TCR tracking.
• 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
The value of the hermetic enclosure over the molded part is
in the long term performance. Moisture and oxygen both
pass through plastic and both contribute to long term
degradation of resistive elements. Divider ratios of 1:1 are
not as likely to lose ratio with time but as the ratios become
greater, the imbalance of power has more effect on the ratio
stability and the hermetic enclosure becomes of paramount
importance.
Our Application Engineering Department is available to
advise and make recommendations. For non-standard
technical requirements and special applications. Please
contact us.
• Any value available within resistance range (e.g. 1K234)
• Prototype samples available from 48 h. For more
information, please contact foil@vishaypg.com
•
For better performances, please contact us
R2
R1
Vin
-
Vout
+
VHD200,
VHD144
TABLE 1 - VHD200 AND VHD144 SPECIFICATIONS
STANDARD RESISTANCE
TOLERANCE
RESISTANCE
SHELF
LIFE
STABILITY
(ppm/yr)
TCR
TRACKING
AVAILABLE TO
VISHAY
MODEL
RATIO
AVAILABLE1)
(Ω)
POWER RATING3), 6)
ABSOLUTE
MATCH
AVAILABLE TO AVAILABLE TO
0.1 W at + 25 °C (for the entire resistive
element R1 + R2) divided proportionally
between the two elements (over 10K).4)
VHD2002)
VHD1445)
0.005 %
0.005 %
⎛
0.001 %
0.005 %
0.1 ppm/°C
5
5
Any value from
100 Ω to 20K
per side
< 0.5 ppm/°C
for like values
< 1 ppm/°C
standard
0.2 W at + 70 °C (for the entire resistive
element R1 + R2) divided proportionally
between the two elements.
Notes
R1
------------------
R2
R1 + R2
⎞
⎠
⎛
⎝
⎞
⎠
------------------
P1
=
P
P2
=
P
1. For resistance ratios outside the range, contact Vishay’s
Applications Engineering Department.
⎝
R1 + R2
2. The VHD200 is available in any required ratio between the
resistance values of 100 Ω and 20 kΩ, such that R1 can be any
value between 100 Ω and 20 kΩ and R2 can also be any value
between 100 Ω and 20 kΩ.
3. Power is proportional to the divider ratio.
Example: In a VHD144 (1K/10K dual), the power rating would be
18 mW on the 1K and 182 mW on the 10K, for a total of 200 mW
on R1 + R2.
4. For power rating of values below 10K, contact the applications
engineering department.
5. Any value from 100 Ω to 20 kΩ inclusive is available with some
derating of power.
6. Maximum voltage is 200 V.
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63036
Revision: 23-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
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