MMQA Quad Common
Anode Series
Preferred Devices
SC−74 Quad Monolithic
Common Anode
Transient Voltage Suppressors
for ESD Protection
http://onsemi.com
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.
SC−74 QUAD TRANSIENT
VOLTAGE SUPPRESSOR
24 WATTS PEAK POWER
5.6 − 33 VOLTS
Specification Features:
PIN ASSIGNMENT
• SC−74 Package Allows Four Separate Unidirectional Configurations
• Peak Power − Min. 24 W @ 1.0 ms (Unidirectional),
1
2
3
6
5
4
per Figure 5 Waveform
• Peak Power − Min. 150 W @ 20 ms (Unidirectional),
per Figure 6 Waveform
• Maximum Clamping Voltage @ Peak Pulse Current
6
1
• Low Leakage < 2.0 mA
SC−74
PLASTIC
CASE 318F
PIN 1. CATHODE
2. ANODE
• ESD Rating of Class N (exceeding 16 kV) per the
3. CATHODE
4. CATHODE
5. ANODE
Human Body Model
• Pb−Free Packages are Available
6. CATHODE
THERMAL CHARACTERISTICS (T = 25°C unless otherwise noted)
A
Characteristic
Symbol Value
Unit
MARKING DIAGRAM
Peak Power Dissipation @ 1.0 ms (Note 1)
P
pk
24
W
@ T ≤ 25°C
A
Peak Power Dissipation @ 20 ms (Note 2) @
P
pk
150
W
xxx
T
≤ 25°C
A
Total Power Dissipation on FR-5 Board
°P °
D
°225
1.8
°mW°
mW/°C
(Note 3) @ T = 25°C
A
xxx = Device Code
Thermal Resistance from Junction−to−Ambi-
ent
R
556
°C/W
q
JA
M
= Date Code
Total Power Dissipation on Alumina Sub-
°P °
D
°300
2.4
°mW
mW/°C
strate (Note 4) @ T = 25°C
A
ORDERING INFORMATION
Derate above 25°C
See detailed ordering and shipping information in the table on
page 5 of this data sheet.
Thermal Resistance from Junction−to−Ambi-
ent
R
417
°C/W
°C
q
JA
Junction and Storage Temperature Range
T , T
J
°− 55 to
+150°
stg
DEVICE MARKING INFORMATION
See specific marking information in the device marking table
on page 5 of this data sheet.
Lead Solder Temperature − Maximum (10
Second Duration)
T
L
260
°C
Preferred devices are recommended choices for future use
and best overall value.
Semiconductor Components Industries, LLC, 2004
1
Publication Order Number:
April, 2004 − Rev. 4
MMQA/D