ACAS 0606 AT, ACAS 0612 AT - Precision

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Vishay Beyschlag

Revision: 17-Aug-2022

2

Document Number: 28770

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APPLICATION INFORMATION

When the resistor dissipates power, a temperature rise above the ambient temperature occurs, dependent on the thermal

resistance of the assembled resistor together with the printed circuit board. The rated dissipation applies only if the permitted

film temperature is not exceeded.

Please

consider

the

application

note

“Thermal

Management

in

Surface-Mounted

Resistor

Applications”

(www.vishay.com/doc?28844) for information on the general nature of thermal resistance.

These resistors do not feature a limited lifetime when operated within the permissible limits. However, resistance value drift

increasing over operating time may result in exceeding a limit acceptable to the specific application, thereby establishing a

functional lifetime.

Notes

• Figures are given for arrays with equal values, design type AE

• The presented operation modes do not refer to different types of resistors, but actually show examples of different loads, that lead to

different film temperatures and different achievable load-life stability (drift) of the resistance value. A suitable low thermal resistance of the

circuit board assembly must be safeguarded in order to maintain the film temperature of the resistors within the specified limits. Please

consider the application note “Thermal Management in Surface-Mounted Resistor Applications” (www.vishay.com/doc?28844) for

information on the general nature of thermal resistance.

CIRCUITS

Marking on ACAS 0606 AT: for types with different resistor values pin 1 is marked.

Note

• Customized ACAS 0612 AT with four different ohmic values on request

MAXIMUM RESISTANCE CHANGE AT RATED DISSIPATION

OPERATION MODE

STANDARD

POWER

Rated dissipation per element,

P70

ACAS 0606 AT

0.100 W

0.125 W

ACAS 0612 AT

0.100 W

0.125 W

Rated dissipation per packaging,

P70

ACAS 0606 AT

0.150 W

0.200 W

ACAS 0612 AT

0.300 W

0.400 W

Operating temperature range

-55 °C to 125 °C

-55 °C to 155 °C

Permissible film temperature,

ϑF max.

125 °C

155 °C

Max. resistance change at

P70 for resistance range,

|

ΔR/R| after:

ACAS 0606 AT

47

Ω to 150 kΩ

47

Ω to 150 kΩ

ACAS 0612 AT

47

Ω to 150 kΩ

47

Ω to 150 kΩ

1000 h

≤ 0.1 %

≤ 0.25 %

8000 h

≤ 0.25 %

≤ 0.5 %

Max. relative resistance change (relative drift)

at

P70 for resistance range, |ΔR/R| after:

ACAS 0606 AT

47

Ω to 150 kΩ

47

Ω to 150 kΩ

ACAS 0612 AT

47

Ω to 150 kΩ

47

Ω to 150 kΩ

1000 h

≤ 0.05 %

≤ 0.125 %

8000 h

≤ 0.125 %

≤ 0.25 %

DESIGN

ACAS 0606 AT

ACAS 0612 AT

AE

R1 = R2

R1 = R2 = R3 = R4

TP

R1 = R4 < R2 = R3

DF

R1 < R2

R

1

R

2

R

1

R

2

R

3

R

4

Pin 1

ACAS 0606 AT

ACAS 0612 AT

43

2

Pin 1

23

4

8

76

5