Document Number: 63070

For any questions, contact: foil@vishay.com

www.vishay.com

Revision: 18-Sep-08

2

VSM Series (0805, 1206, 1506, 2010, 2512)

High Precision Foil Wraparound Surface

Mount Chip Resistor with TCR of ± 2 ppm/°C

and Load Life Stability of ± 0.01 % (100 ppm)

Vishay Foil Resistors

Note

1. Land Pattern Dimensions are per IPC-7351A

Note

1. As shown + 0.01

Ω to allow for measurement errors at low values.

FIGURE 2 - TRIMMING TO VALUES

(Conceptual Illustration)

Mutual Inductance

Reduction due

to Change in

Current Direction

Current Path

Before Trimming

Note: 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

FIGURE 3 -TYPICAL TCR CURVE

(For more details, see Table 1)

Note

• The TCR values for < 100

Ω are influenced by the termination

composition and result in deviation from this curve.

- 55

- 50

- 25

0

+ 25

+ 50

+ 75

+ 100

+ 125

± 2 ppm/°C

(+ 25 °C reference)

+ 150

+ 100

+ 50

0

- 50

- 100

- 150

- 200

R

(ppm)

Ambient Temperature (°C)

TABLE 2 - DIMENSIONS AND LAND PATTERN in inches (millimeters)

CHIP SIZE

L

± 0.005 (0.13)

W

± 0.005 (0.13)

THICKNESS

MAXIMUM

D

± 0.005 (0.13)

MAXIMUM

MINIMUM

MAXIMUM

0805

0.080 (2.03)

0.050 (1.27)

0.025 (0.64)

0.015 (0.38)

0.122 (3.10)

0.028 (0.71)

0.050 (1.27)

1206

0.126 (3.20)

0.062 (1.57)

0.025 (0.64)

0.020 (0.51)

0.175 (4.45)

0.059 (1.50)

0.071 (1.80)

1506

0.150 (3.81)

0.062 (1.57)

0.025 (0.64)

0.020 (0.51)

0.199 (5.05)

0.083 (2.11)

0.071 (1.80)

2010

0.198 (5.03)

0.097 (2.46)

0.025 (0.64)

0.025 (0.64)

0.247 (6.27)

0.115 (2.92)

0.103 (2.62)

2512

0.249 (6.32)

0.127 (3.23)

0.025 (0.64)

0.032 (0.81)

0.291 (7.39)

0.150 (3.81)

0.127 (3.23)

Recommended Land Pattern

Footprint

G

Z

X

Top View

D

T

W

L

TABLE 3 - SPECIFICATIONS

CHIP SIZE

RATED POWER (mW)

at + 70 °C

MAX VOLTAGE RATING

(

≤

)

RESISTANCE RANGE

(

Ω)

MAXIMUM WEIGHT

(mg)

0805

100

34 V

10 to 12K

6

1206

150

67 V

10 to 30K

11

1506

200

89 V

10 to 40K

12

2010

300

173 V

10 to 100K

27

2512

400

220 V

10 to 150K

40

TABLE 4 - PERFORMANCES

TEST OR CONDITIONS

MIL-PRF-55342

CHARACTERISTIC E

ΔR LIMITS

TYPICAL

ΔR LIMITS

MAXIMUM

Thermal Shock

± 0.1 %

± 0.005 % (50 ppm)

± 0.02 % (200 ppm)

Low Temperature Operation

± 0.1 %

± 0.01 % (100 ppm)

± 0.02 % (200 ppm)

Short Time Overload

± 0.1 %

± 0.01 % (100 ppm)

± 0.02 % (200 ppm)

High Temperature Exposure

± 0.1 %

± 0.01 % (100 ppm)

± 0.03 % (300 ppm)

Resistance to Soldering Heat

± 0.2 %

± 0.005 % (50 ppm)

± 0.01 % (100 ppm)

Moisture Resistance

± 0.2 %

± 0.005 % (50 ppm)

± 0.03 % (300 ppm)

Load Life Stability + 70 °C for 2000 h at Rated Power

± 0.5 %

± 0.005 % (50 ppm)

± 0.01 % (100 ppm)

PR

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