© Semiconductor Components Industries, LLC, 2005

August, 2005 − Rev. 6

1

Publication Order Number:

MMQA/D

MMQA Quad Common

Anode Series

Preferred Devices

SC−74 Quad Monolithic

Common Anode

Transient Voltage Suppressors

for ESD Protection

This quad monolithic silicon voltage suppressor is designed for

applications requiring transient overvoltage protection capability. It is

intended for use in voltage and ESD sensitive equipment such as

computers, printers, business machines, communication systems,

medical equipment, and other applications. Its quad junction common

anode design protects four separate lines using only one package.

These devices are ideal for situations where board space is at a

premium.

Features

per Figure 5 Waveform

per Figure 6 Waveform

Characteristic

Symbol

Value

Unit

Peak Power Dissipation @ 1.0 ms (Note 1)

24

W

Peak Power Dissipation @ 20

ms (Note 2)

150

W

Total Power Dissipation on FR-5 Board

1.8

mW

°

mW/

°C

°

Thermal Resistance from

Junction−to−Ambient

556

°C/W

Total Power Dissipation on Alumina

Derate above 25

°C

2.4

mW

°

mW/

°C

Thermal Resistance from

Junction−to−Ambient

417

°C/W

Junction and Storage Temperature Range

+150

°

°C

Lead Solder Temperature − Maximum

(10 Second Duration)

260

°C

SC−74 QUAD TRANSIENT

VOLTAGE SUPPRESSOR

24 WATTS PEAK POWER

5.6 − 33 VOLTS

Preferred devices are recommended choices for future use

and best overall value.

SC−74

PLASTIC

CASE 318F

PIN 1. CATHODE

2. ANODE

3. CATHODE

4. CATHODE

5. ANODE

6. CATHODE

1

2

3

6

5

4

MARKING DIAGRAM

See detailed ordering and shipping information in the table on

page 5 of this data sheet.

ORDERING INFORMATION

See specific marking information in the device marking table

on page 5 of this data sheet.

DEVICE MARKING INFORMATION

PIN ASSIGNMENT

http://onsemi.com

1

6

xxx M

G

G

xxx

= Device Code

M

= Date Code*

G

= Pb−Free Package

(Note: Microdot may be in either location)

*Date Code orientation may vary depending

upon manufacturing location.