11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
SG78xxA/78xx
TM
®
Positive Fixed Voltage Regulator
P
RODUCT
D
ATASHEET
ABSOLUTE MAXIMUM RATINGS
WWW .
Microsemi
.C
OM
Device Output Voltage
5V
12V
15V
Input Voltage
35V
35V
35V
Input Voltage
(Transient)(Note 3)
50V
50V
50V
Input Voltage Differential
(Output Shorted to Ground)
35V
35V
35V
Operating Junction Temperature .........................................................................................................................................................150°C
Storage Temperature Range ................................................................................................................................................. -65°C to 150°C
Lead Temperature (Soldering 10 seconds) ..........................................................................................................................................300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of
specified terminal
.
Note 3: Operation at high input voltages is dependent upon load current. When load current is less than 5mA, output will rise out of regulation as input-
output differential increases beyond 30V. Note also from figure 1, that maximum load current is reduced at high voltages. The 50V input rating of the
SG78xxA series refers to ability to withstand high line or transient conditions without damage. Since the regulator’s maximum current capability is
reduced, the output may fall out of regulation at high input voltages under nominal loading.
THERMAL DATA
K
TO-3 3-Terminal Metal Can (Two pins and case)
3.0°C/W
35°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
T
TO-39 3-Pin Metal Can
15°C/W
120°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
G
TO-257 3-Pin Hermetic
3.5°C/W
42°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
IG
TO-257 3-Pin Hermetic (Isolated)
4.0°C/W
42°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
L
Leadless Chip Carrier 20-Pin Ceramic
35°C/W
120°C/W
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
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