6

Sidac

Data Sheets

Figure E9.15 Relaxation Oscillator Using a Sidac

Figure E9.16 Sidac Added to Protect Transistor for Typical Transistor Inductive Load Switching Requirements

V

DC(IN) ≥

V

B0

V

C

I

L

R

L

R

SIDAC

(a) Circuit

R

max ≤

V

IN

-V

BO

I

BO

R

min ≥

V

IN

-V

TM

I

H (MIN)

(b) Waveforms

V

BO

V

C

I

L

t

t

C

100 mH

+

-

Test Circuit

+

-

100

Ω

150

Ω

2N6127

(or equivalent)

50

Ω

50

Ω

Input

(See Note B)

TIP-47

Voltage and Current Waveforms

Input

Voltage

0 V

5 V

0.63 A

0

10 V

(See Note A)

Collector

Current

Collector

Voltage

100 ms

The Sidac (or Diac) eliminates a reverse breakdown of the transistor in inductive switching circuits where otherwise the

transistor could be destroyed.