LM139ADT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

LM139ADT

Low-power quad voltage comparators

STMicroelectronics 

1 2 3 4 5 6 7 8 9 10 Next

Typical applications

Figure 18. Limit comparator

VCC (12 V)

V(ref)

high

2RS

RS

10 kΩ

1/ 4

LM139

Lamp

e~

I

V(ref)

low

2RS

1/ 4

LM139

2N 2222

Figure 20. Zero crossing detector

15 V

LM139, LM239, LM339

Figure 19. Crystal-controlled oscillator

V

CC

= 15 V

200 kΩ

0.1 μF

100 kΩ

1/ 4

LM139

2 kΩ

VCC

0

eo

200 kΩ

f = 100 kHz

Figure 21. Comparator with a negative

reference

15 V

eI ~

1/4

LM139

15 V

5.1 kΩ

eo

eI ~

1/ 4

LM139

5V

15 V

5.1 kΩ

eo

10/19

Doc ID 2159 Rev 3

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