Document Number: 63036

For any questions, contact: foil@vishay.com

www.vishay.com

Revision: 13-Nov-07

1

VHD200, VHD144

Vishay Foil Resistors

Voltage Dividers with TCR Tracking of 0.1 ppm/°C

and Tolerance Match down to 0.001 %

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.

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.

FEATURES

Absolute: ± 2 ppm/°C typical

(- 55 °C to + 125 C, 25 °C ref.)

Tracking: 0.1 ppm/°C typical

• 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

• 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. 1K234)

• Prototype samples available from 48 h. For more

information, please contact foil@vishay.com

• For better performances, please contact us

Notes

1. For resistance ratios outside the range, contact Vishay’s

Applications Engineering Department.

2. The VHD200 is available in any required ratio between the

resistance values of 100

Ω and 20 kΩ, such that R

value between 100

Ω and 20 kΩ and R

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

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

Available

Pb-free

RoHS*

COMPLIANT

R

1

R

2

V

in

V

out

-

+

VHD200,

VHD144

TABLE 1 - VHD200 AND VHD144 SPECIFICATIONS

VISHAY

MODEL

RESISTANCE

RATIO

(

Ω)

STANDARD RESISTANCE

TOLERANCE

TCR

TRACKING

AVAILABLE TO

SHELF

LIFE

STABILITY

(ppm/yr)

ABSOLUTE

AVAILABLE TO

MATCH

AVAILABLE TO

Any value from

100

Ω to 20K

per side

0.1 W at + 25 °C (for the entire resistive

± 0.005 %

0.001 %

0.1 ppm/°C

5

0.2 W at + 70 °C (for the entire resistive

between the two elements.

± 0.005 %

0.005 %

< 0.5 ppm/°C

for like values

< 1 ppm/°C

standard

5

P

1

R

1

R

1

R

2

+

-------------------

⎝⎠

⎛⎞

P

=

P

2

R

2

R

1

R

2

+

-------------------

⎝⎠

⎛⎞

P

=