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Vishay Foil Resistors

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2

VFCP Series (0805, 1206, 1506, 2010, 2512) (Z-Foil)

Document No.: 63106

Revision: 04-Nov-2013

TABLE 1—TOLERANCE AND TCR VS.

RESISTANCE VALUE

Resistance

Value

(Ω)

Tolerance

(%)

Nominal TCR and Max. Spread

(–55°C to +125°C, +25°C Ref.)

(ppm/°C)

250 to 125k

±0.01%

±0.2 ±1.6

100 to <250

±0.02%

±0.2 ±1.6

50 to <100

±0.05%

±0.2 ±1.8

25 to <50

±0.1%

±0.2 ±2.8

10 to <25

±0.25%

±0.2 ±2.8

5 to <10

±0.5%

±0.2 ±7.8

FIGURE 1—POWER DERATING CURVE

100

75

50

25

0

–75 –50 –25

0

+25 +50 +75 +100 +125 +150 +175

Ambient Temperature (°C)

+70°C

–55°C

FIGURE 2—NOMINAL

RESISTANCE/TEMPERATURE CURVE

+500

+200

+100

0

–100

–200

–300

–500

Ambient Temperature (°C) and TCR Chord Slopes

for Different Temperature Ranges

0.05 ppm/°C

- 0.1 ppm/°C

0.1 ppm/°C

0.14 ppm/°C

0.2 ppm/°C

- 0.16 ppm/°C

–400

+300

+400

–55

–25

0

+25

+60 +75 +100 +125

Note

The TCR values for <100 Ω are influenced by the termination

composition and result in deviation from this curve.

FIGURE 3—TRIMMING TO VALUES

(conceptual illustration)

Mutual

Inductance

Reduction

due to Change

in Current

Direction

Current Path

Before Trimming

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

Note

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 reduces the effect of “hot spots” and improves the

long-term stability of the Vishay Foil resistors.

TABLE 2—MODEL SELECTION

Chip

Size

Rated Power

at +70°C

(mW)

Maximum

Voltage Rating

(≤√P

× R)

Resistance

Range

(Ω)

Max.

Weight

(mg)

0805

100 mW

28 V

5 to 8k

5.2

1206

250 mW

79 V

5 to 25k

10.3

1506

300 mW

95 V

5 to 30k

12

2010

400 mW

167 V

5 to 70k

25

2512

600 mW

220 V

5 to 125k

35

TABLE 3—LOAD-LIFE STABILITY

(+70°C for 2000 h)

Chip Size

MAXIMUM ∆R LIMITS

0805

±0.005% at 50 mW

±0.01% at 100 mW

1206

±0.005% at 150 mW

±0.01% at 250 mW

1506

±0.005% at 150 mW

±0.01% at 300 mW

2010

±0.005% at 200 mW

±0.01% at 400 mW

2512

±0.005% at 500 mW

±0.01% at 600 mW