Page 1
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
Description
The AS321 is a high gain and internally frequency compensated
operational amplifier specifically designed to operate from a single
power supply. Operation from split power supply is also possible and
the low power supply current drain is independent of the magnitude of
the power supply voltages. Typical applications include battery
charger, active filters, general purpose controllers and most
conventional operational amplifier circuits.
The AS321 is compatible with industry standard 321.
The AS321 is available in SOT-23-5 packages.
Features
Excellent Phase Margin: 60 deg.
Large Voltage Gain: 100dB (Typical)
Low Input Bias Current: 20nA (Typical)
Low Input Offset Voltage: 2mV (Typical)
Low Supply Current: 0.35mA at V
CC
= 5V
Wide Power Supply Voltage:
Single Supply: 3V to 36V
Dual Supplies: ±1.5V to ±18V
Wide Input Common Mode Voltage Range: 0V to VCC-1.5V
Pin Assignments
(Top View)
(SOT-23-5/ K Package)
Applications
Battery Charger
Active Filters
General Purpose Controllers, Instruments
INPUT +
1
2
3
4
5
INPUT -
V
EE
V
CC
OUTPUT
LOW POWER SINGLE OPERATIONAL AMPLIFIER
Typical Applications Circuit
Power Amplifier DC Summing Amplifier
Page 2
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
Typical Applications Circuit (Cont.)
AC Coupled Non-Inverting Amplifier Fixed Current Sources
Pulse Generator DC Coupled Low-Pass Active Filter
Page 3
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
Symbol
Parameter
Rating
Unit
VS (VCC-VEE)
Power Supply Voltage
40
V
V
ID
Differential Input Voltage
40
V
V
IN
Input Voltage
-0.3 to 40
V
θ
JA
Thermal Resistance to Ambient
260
C/W
TJ
Operating Junction Temperature
+150
C
T
STG
Storage Temperature Range
-65 to +150
C
T
LEAD
Lead Temperature (Soldering, 10 Seconds)
+260
C
Symbol
Parameter
Min
Max
Unit
V
CC
Supply Voltage
3
36
V
T
A
Ambient Operating Temperature Range
-40
+85
C
Functional Block Diagram
Absolute Maximum Ratings (Note 1)
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Page 4
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIO
Input Offset Voltage
VO = 1.4V, R
S
= 0Ω, V
CC
= 5V to 30V
(Note 3)
– 2 5
mV
–
–
7
∆VIO/∆T
Average Temperature Coefficient
of Input Offset Voltage
TA = -40oC to +85oC
– 7 –
µV/ oC
I
BIAS
Input Bias Current
IIN+ or IIN-, V
CM
= 0V
–
20
100
nA
–
–
200
I
IO
Input Offset Current
IIN+ - IIN-, V
CM
= 0V
– 5 30
nA
–
–
100
V
CM
Input Common Mode Voltage
Range (Note 4)
V
CC
= 30V, CMRR ≥ 50dB
0 – VCC-1.5
V
I
CC
Supply Current
R
L
= ∞, V
CC
= 5V
–
0.35
0.80
mA
–
0.45
1.0
R
L
= ∞, V
CC
= 30V
–
0.45
1.2 – 0.65
1.5
G
V
Large Signal Voltage Gain
V
CC
= 15V, VO = 1V to 11V, RL ≥ 2kΩ
85
100
–
dB
80
–
–
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to (VCC-1.5)V, RS ≤ 10kΩ
60
70
–
dB
60
–
–
PSRR
Power Supply Rejection Ratio
V
CC
= 5V to 30V, RS ≤ 10kΩ
70
100
–
dB
60
–
–
I
SOURCE
Output Current
Source
VIN+ = 1V, VIN- = 0V, VCC = 15V, VO =
2V
20
40
–
mA
20
–
–
I
SINK
Sink
VIN+ = 0V, VIN- = 1V, VCC = 15V, VO =
2V
10
15
–
mA
5
–
–
VIN+ = 0V, VIN- = 1V, VCC = 15V, VO =
0.2V
12
50 – µA
I
SC
Output Short Circuit Current to
Ground
VCC = 15V
–
40
60
mA
V
OH
Output Voltage Swing
VCC = 30V, RL = 2kΩ
26 – –
V
26
–
–
VCC = 30V, RL = 10kΩ
27
28
–
27
–
–
V
OL
VCC = 5V, RL = 10kΩ
– 5 20
mV
–
–
30
THD
Total Harmonic Distortion
f = 1kHz, AV = 20dB, RL = 2kΩ,
VO = 2Vp-p, CL = 100pF, V
CC
= 30V
–
0.015 – %
Φ
M
Phase Margin
– – 60 – Deg
θ
JC
Thermal Resistance
(Junction to Case)
SOT-23-5
–
101 – C/W
Electrical Characteristics (Limits in standard typeface are for T
= 5V, VEE = 0V, VO = 1.4V, unless otherwise specified.)
= +25oC, bold typeface applies over -40oC to +85oC (Note 2), V
A
CC
Notes: 2. Limits over the full temperature are guaranteed by design, but not tested in production.
3. Over the full input common-mode range 0V to VCC-1.5V (at +25oC).
4. The input common-mode voltage of either input signal voltage should not be allowed to go negatively by more than 0.3V (at +25oC). The upper end of the
common-mode voltage range is VCC-1.5V (at +25oC), but either or both inputs can go to +36V without damages, independent of the magnitude of the V
.
CC
Page 5
AS321
Document number: DS36976 Rev. 2 - 2
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© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
0
4
3
3 2 1
2
1 0 12
16
20 4 24
28
32 8 36
40
Time (µs)
0
Output Voltage (V)
0 5 10 15
0
5
10
15
POSITIVE
NEGATIVE
Input Voltage (
+V
DC
)
Power Supply Voltage (+VDC)
-25 0 25 50 75 100 125
0
2
4
6
8
10
12
14
16
18
20
Input Current (nA)
Temperature (oC)
0 5 10 15 20 25 30 35 40
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Supply Current (mA)
Supply Voltage (V)
0 8 16 24 32 40
60
75
90
105
120
Power Supply Voltage (V)
Voltage Gain (dB)
RL=2K
RL=20K
Input Voltage (V)
-20
0
20
40
60
80
0.2k 1k 10k 100k 1M 2M
Open Loop Gain (dB)
Frequency (Hz)
VCC=30V, VEE=0V
RL=2k, CL=100pF
Performance Characteristics
Open Loop Gain vs. Frequency Voltage Follower Pulse Response
Input Voltage Range Input Current
Supply Current Voltage Gain
Page 6
AS321
Document number: DS36976 Rev. 2 - 2
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© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
100
200
300
400
500
600
700
800
Time (µs)
0 4 8
12
16
20
1k 10k 100k 1M
0
5
10
15
20
Frequency (Hz)
Output Swing (V)
0.1 1 10 100
0
1
2
3
4
5
6
7
8
Output Voltage Referenced to Vcc (V)
Output Source Current (mA)
1E-3 0.01 0.1 1 10 100
0.01
0.1
1
10
VCC=15V
Output Voltage (V)
Output Sink Current (mA)
VCC=5V
-25 0 25 50 75 100 125
0
10
20
30
40
50
60
70
80
90
100
Output Current (mA)
Temperature (oC)
Output Voltage (mV)
Performance Characteristics (Cont.)
Voltage Follower Pulse Response (Small Signal) Large Signal Frequency Response
Output Characteristics: Current Sourcing Output Characteristics: Current Sinking
Current Limiting
Page 7
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
AS321 X XX - XX
PackingPackageProduct Name E1/G1
TR : Tape & Reel
K : SOT-23-5
G1 : Green
E1 : Lead Free
Package
Temperature
Range
Part Number
Marking ID
Packing Type
Lead Free
Green
Lead Free
Green
SOT-23-5
-40°C to +85°C
AS321KTR-E1
AS321KTR-G1
E6T
G6T
Tape & Reel
Ordering Information
Diodes IC's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Products with "G1" suffix are available in green packages.
Page 8
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
2.820(0.111)
2.650(0.104)
1
.
500
(
0
.
059
)
0
.
000
(
0
.
000
)
0.300(0.012)
0.950(0.037)
0
.
900
(
0
.
035
)
0.100(0.004)
0.200(0.008)
0
.
300
(
0
.
012
)
8°
0°
3.100(0.122)
1
.
700
(
0
.
067
)
3
.
000
(
0
.
118
)
0.500(0.020)
0
.
150
(
0
.
006
)
1
.300(
0.051
)
0.200(0.008)
0
.
600
(
0
.
024
)
1.800(0.071)
2.000(0.079)
0
.
700
(
0
.
028
)
REF
TYP
1
.
450
(
0
.
057
)
MAX
Package Outline Dimensions (All dimensions in mm(inch).)
(1) Package Type: SOT-23-5
Page 9
AS321
Document number: DS36976 Rev. 2 - 2
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
E2
E1
Y
X
G
Z
Dimensions
Z
(mm)/(inch)
G
(mm)/(inch)
X
(mm)/(inch)
Y
(mm)/(inch)
E1
(mm)/(inch)
E2
(mm)/(inch)
Value
3.600/0.142
1.600/0.063
0.700/0.028
1.000/0.039
0.950/0.037
1.900/0.075
Suggested Pad Layout
(1) Package Type: SOT-23-5
Page 10
AS321
Document number: DS36976 Rev. 2 - 2
10 of 10
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February 2014
© Diodes Incorporated
AS321
A Product Line of
Diodes Incorporated
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2012, Diodes Incorporated
www.diodes.com
IMPORTANT NOTICE
LIFE SUPPORT
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