AD815
REV. B –3–
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the AD815
is limited by the associated rise in junction temperature. The
maximum safe junction temperature for the plastic encapsulated
parts is determined by the glass transition temperature of the
plastic, about 150°C. Exceeding this limit temporarily may
cause a shift in parametric performance due to a change in the
stresses exerted on the die by the package. Exceeding a junction
temperature of 175°C for an extended period can result in
device failure.
The AD815 has thermal shutdown protection, which guarantees
that the maximum junction temperature of the die remains below a
safe level, even when the output is shorted to ground. Shorting
the output to either power supply will result in device failure.
To ensure proper operation, it is important to observe the
derating curves and refer to the section on power considerations.
It must also be noted that in high (noninverting) gain configurations
(with low values of gain resistor), a high level of input overdrive
can result in a large input error current, which may result in a
significant power dissipation in the input stage. This power
must be included when computing the junction temperature rise
due to total internal power.
AMBIENT TEMPERATURE – 8C
14
7
4
–50 90–40
MAXIMUM POWER DISSIPATION – Watts
–30 –20 –10 10 20 30 40 50 60 70 80
13
8
6
5
11
9
12
10
0
T
J
= 1508C
3
2
1
0
AD815 AVR, AY
θ
JA
= 418C/W
(STILL AIR = 0FT/MIN)
NO HEAT SINK
θ
JA
= 528C/W
(STILL AIR = 0 FT/MIN)
NO HEAT SINK
AD815ARB-24
θ
JA
= 168C/W
SOLDERED DOWN TO
COPPER HEAT SINK
(STILL AIR = 0FT/MIN)
AD815 AVR, AY
Plot of Maximum Power Dissipation vs. Temperature
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V Total
Internal Power Dissipation
2
Plastic (Y and VR) . . 3.05 Watts (Observe Derating Curves)
Small Outline (RB) . . 2.4 Watts (Observe Derating Curves)
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . . ±V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . ±6 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Can Only Short to Ground
Storage Temperature Range
Y, VR and RB Package . . . . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD815A . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Lead Temperature Range (Soldering, 10 sec) . . . . . . . +300°C
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
Specification is for device in free air with 0 ft/min air flow: 15-Lead Through-Hole
and Surface Mount: θ
JA
= 41°C/W; 24-Lead Surface Mount: θ
JA
= 52°C/W.
PIN CONFIGURATION
24-Lead Thermally-Enhanced SOIC (RB-24)
TOP VIEW
(Not to Scale)
AD815
13
16
15
14
24
23
22
21
20
19
18
17
12
11
10
9
8
1
2
3
4
7
6
5
NC = NO CONNECT
NC
NC
NC
NC
NC
NC
NC
NC
+IN1
–IN1
–IN2
+IN2
OUT1
–V
S
OUT2
+V
S
*HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY.
THERMAL
HEAT TABS
+V
S
*
THERMAL
HEAT TABS
+V
S
*
ORDERING GUIDE
Model Temperature Range Package Description Package Option
AD815ARB-24 –40°C to +85°C 24-Lead Thermally Enhanced SOIC RB-24
AD815ARB-24-REEL –40°C to +85°C 24-Lead Thermally Enhanced SOIC RB-24
AD815AVR –40°C to +85°C 15-Lead Surface Mount DDPAK VR-15
AD815AY –40°C to +85°C 15-Lead Through-Hole SIP with Staggered Leads and 90° Lead Form Y-15
AD815AYS –40°C to +85°C 15-Lead Through-Hole SIP with Staggered Leads and Straight Lead Form YS-15
AD815-EB Evaluation Board
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD815 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
