Datasheet
Operational Amplifiers
Ultra Low Supply Current
CMOS Operational Amplifiers
BU7421G
BU7421SG
Key Specifications
Operating Supply Voltage (single supply):
+1.7V to +5.5V
Supply Current:
8.5µA(Typ)
Temperature Range:
BU7421G
-40°C to +85°C
BU7421SG
-40°C to +105°C
Input Offset Current:
1pA (Typ)
Input Bias Current:
1pA (Typ)
General Description
The BU7421G is low voltage operation, input ground
sense and output full swing CMOS operational
amplifiers. The BU7421SG has an expanded
temperature range. They have features of low supply
current and low input bias current. There are suitable
for battery-powered equipment and sensor amplifiers.
Features
Ultra-low Supply Current
Low Operating Supply Voltage
Wide Operating Temperature Range(BU7421SG)
Low Input Bias Current
Packages
SSOP5
W(Typ) x D(Typ) x H(Max)
L2.90mm
x 2.80mm x 1.25mm
Applications
Battery-powered Equipment
Consumer Equipment
Sensor Amplifier
Simplified Schematic
VDD
V
bias
IN+
Class
IN-
AB control
OUT
V
bias
VSS
Figure 1. Simplified Schematic
○Product
structure：Silicon monolithic integrated circuit
○This
product has no designed protection against radioactive rays.
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BU7421SG
Datasheet
Pin Configuration
BU7421G, BU7421SG: SSOP5
Pin No.
IN+
VSS
IN-
1
2
3
+
-
4
OUT
5
VDD
Pin Name
IN+
VSS
IN-
OUT
VDD
1
2
3
4
5
Package
SSOP5
BU7421G
BU7421SG
Ordering Information
B
U
7
4
2
1
x
x
-
T R
Packaging and forming specification
TR: Embossed tape and reel
Part Number
BU7421G
BU7421SG
Package
G: SSOP5
Line-up
T
opr
-40°C to +85°C
-40°C to +105°C
SSOP5
SSOP5
Package
Reel of 3000
Reel of 3000
Orderable Part Number
BU7421G-TR
BU7421SG-TR
Absolute Maximum Ratings
(T
A
=25°C)
Parameter
Supply Voltage
Power Dissipation
Differential Input Voltage
Input Common-mode
Voltage Range
Input Current
(Note 4)
Operating Supply Voltage
Operating Temperature
Storage Temperature
Maximum
Junction Temperature
(Note 3)
Symbol
VDD - VSS
P
D
V
ID
V
ICM
I
I
V
opr
T
opr
T
stg
T
Jmax
Ratings
BU7421G
+7
0.54
(Note 1,2)
VDD - VSS
(VSS-0.3) to (VDD+0.3)
±10
+1.7 to +5.5
- 40 to +85
- 55 to +125
+125
- 40 to +105
BU7421SG
Unit
V
W
V
V
mA
V
°C
°C
°C
(Note 1) To use at temperature above T
A
＝25C
reduce 5.4mW/°C.
(Note 2) Mounted on a FR4 glass epoxy PCB 70mm×70mm×1.6mm (Copper foil area less than 3%).
(Note 3) The voltage difference between inverting input and non-inverting input is the differential input voltage.
Then input terminal voltage is set to more than VSS.
(Note 4) An excessive input current will flow when input voltages of more than VDD+0.6V or less than VSS-0.6V are applied.
The input current can be set to less than the rated current by adding a limiting resistor.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open
circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case
the IC is operated over the absolute maximum ratings.
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Electrical Characteristics
○BU7421G,
BU7421SG（Unless otherwise specified VDD=+3V, VSS=0V, T
A
=25°C）
Limit
Temperature
Parameter
Symbol
Range
Min
Typ
Max
Input Offset Voltage
(Note 5)
Input Offset Current
(Note 5)
Input Bias Current
(Note 5)
Supply Current
(Note 6)
Maximum Output Voltage(High)
Maximum Output Voltage(Low)
Large Signal Voltage Gain
Input Common-mode
Voltage Range
Common-mode Rejection Ratio
Power Supply Rejection Ratio
Output Source Current
(Note 7)
Output Sink Current
(Note 7)
Slew Rate
Unity Gain Frequency
Phase Margin
V
IO
I
IO
I
B
I
DD
V
OH
V
OL
A
V
V
ICM
CMRR
PSRR
I
SOURCE
I
SINK
SR
f
T
θ
25°C
25°C
25°C
25°C
Full range
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
-
-
-
-
-
VDD-0.1
-
70
0
45
60
2
4
-
-
-
1
1
1
8.5
-
-
-
100
-
60
80
4
8
50
90
60
6
-
-
17
25
-
VSS+0.1
-
1.8
-
-
-
-
-
-
-
Unit
mV
pA
pA
μA
V
V
dB
V
dB
dB
mA
mA
V/ms
kHz
deg
Conditions
VDD=1.7V to 5.5V
-
-
R
L
=∞, A
V
=0dB
IN+=0.9V
R
L
=10kΩ
R
L
=10kΩ
R
L
=10kΩ
VSS to VDD-1.2V
-
-
OUT=VDD-0.4V
OUT=VSS+0.4V
C
L
=25pF
C
L
=25pF, A
V
=40dB
C
L
=25pF, A
V
=40dB
(Note 5) Absolute value
(Note 6) Full range BU7421G: T
A
=-40°C to +85°C BU7421SG: T
A
=-40°C to +105°C
(Note 7) Under the high temperature environment, consider the power dissipation of IC when selecting the output current.
When the terminal short circuits are continuously output, the output current is reduced to climb to the temperature inside IC.
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Datasheet
Description of Electrical Characteristics
Described below are descriptions of the relevant electrical terms used in this datasheet. Items and symbols used are also
shown. Note that item name and symbol and their meaning may differ from those on another manufacturer’s document or
general document.
1. Absolute maximum ratings
Absolute maximum rating items indicate the condition which must not be exceeded. Application of voltage in excess of absolute
maximum rating or use out of absolute maximum rated temperature environment may cause deterioration of characteristics.
(1) Supply Voltage (VDD/VSS)
Indicates the maximum voltage that can be applied between the VDD terminal and VSS terminal without
deterioration or destruction of characteristics of internal circuit.
(2) Differential Input Voltage (V
ID
)
Indicates the maximum voltage that can be applied between non-inverting and inverting terminals without damaging
the IC.
(3) Input Common-mode Voltage Range (V
ICM
)
Indicates the maximum voltage that can be applied to the non-inverting and inverting terminals without deterioration
or destruction of electrical characteristics. Input common-mode voltage range of the maximum ratings does not assure
normal operation of IC. For normal operation, use the IC within the input common-mode voltage range characteristics.
(4) Power Dissipation (P
D
)
Indicates the power that can be consumed by the IC when mounted on a specific board at the ambient temperature 25
°C
(normal temperature). As for package product, P
D
is determined by the temperature that can be permitted by the IC in
the package (maximum junction temperature) and the thermal resistance of the package.
2. Electrical characteristics
(1) Input Offset Voltage (V
IO
)
Indicates the voltage difference between non-inverting terminal and inverting terminals. It can be translated into the
input voltage difference required for setting the output voltage at 0 V.
(2) Input Offset Current (I
IO
)
Indicates the difference of input bias current between the non-inverting and inverting terminals.
(3) Input Bias Current (I
B
)
Indicates the current that flows into or out of the input terminal. It is defined by the average of input bias currents at
the non-inverting and inverting terminals.
(4) Supply Current (I
DD
)
Indicates the current that flows within the IC under specified no-load conditions.
(5) Maximum Output Voltage(High) / Maximum Output Voltage(Low) (V
OH
/V
OL
)
Indicates the voltage range of the output under specified load condition. It is typically divided into maximum output
voltage High and low. Maximum output voltage high indicates the upper limit of output voltage. Maximum output
voltage low indicates the lower limit.
(6) Large Signal Voltage Gain (A
V
)
Indicates the amplifying rate (gain) of output voltage against the voltage difference between non-inverting terminal
and inverting terminal. It is normally the amplifying rate (gain) with reference to DC voltage.
Av = (Output voltage) / (Differential Input voltage)
(7) Input Common-mode Voltage Range (V
ICM
)
Indicates the input voltage range where IC normally operates.
(8) Common-mode Rejection Ratio (CMRR)
Indicates the ratio of fluctuation of input offset voltage when the input common mode voltage is changed. It is
normally the fluctuation of DC.
CMRR = (Change of Input common-mode voltage)/(Input offset fluctuation)
(9) Power Supply Rejection Ratio (PSRR)
Indicates the ratio of fluctuation of input offset voltage when supply voltage is changed.
It is normally the fluctuation of DC.
PSRR= (Change of power supply voltage)/(Input offset fluctuation)
(10) Output Source Current/ Output Sink Current (I
SOURCE
/ I
SINK
)
The maximum current that can be output from the IC under specific output conditions. The output source current
indicates the current flowing out from the IC, and the output sink current indicates the current flowing into the IC.
(11) Slew Rate (SR)
Indicates the ratio of the change in output voltage with time when a step input signal is applied.
(12) Unity Gain Frequency (f
T
)
Indicates a frequency where the voltage gain of operational amplifier is 1.
(13) Phase Margin (θ)
Indicates the margin of phase from 180 degree phase lag at unity gain frequency.
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