The AMS431 is a three-terminal adjustable shunt regulator with guaranteed temperature stability over the entire range of
operation. The output voltage can be set to any value between 2.5V (VREF) and 36V by adding two external resistors. Due to
the sharp turn-on characteristics this device is an excellent replacement for zener diodes in many applications.
AMS431 is available in TO-92, SO-8, SOT-89 and SOT-23 packages.
ORDERING INFORMATION:
TOL.
±0.25%
±0.5%
±1.0%
TO-92
AMS431AN
AMS431BN
AMS431CN
PACKAGE TYPE
8 LEAD SOIC
AMS431AS
AMS431BS
AMS431CS
SOT-89
AMS431AL
AMS431BL
AMS431CL
3 LEAD SOT-23
AMS431AM
AMS431BM
AMS431CM
OPERATING
TEMP. RANGE
-40 to +85° C
-40 to +85° C
-40 to +85° C
PIN CONNECTIONS
TO-92
Plastic Package (N)
8L SOIC
SO Package (S)
SOT-89
(L)
3L SOT-23
(M)
ANODE
1
2
3
CATHODE
ANODE
ANODE
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
N/C
REF
ANODE
CATHODE
N/C
1
REF
2
3
REF
CATHODE
ANODE CATHODE
Bottom View
Top View
Top View
Top View
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Cathode Voltage (V
Z
)
Continuous Cathode Current (I
Z
)
Reference Input Current (I
REF
)
Junction Temperature (T
J
)
Storage temperature
Lead Temperature (Soldering, 10sec.)
37V
-10mA to +150mA
10mA
-40°C to +125°C
-65°C to +150°C
265°C
Internal Power Dissipation (P
D
)
TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package
Thermal Resistance (ϕ
JA
)
TO-92 Package
SO-8 Package
SOT-89 Package
SOT-23 Package
0.78W
0.71W
0.91W
0.28W
160°C/W
175°C/W
110°C/W
410°C/W
Note 1 :
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics
.
The
guaranteed specifications apply only for the test conditions listed.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I
Z
=10 mA and T
A
= +25°C unless otherwise specified.
Parameter
Reference Voltage
Deviation of Reference
Input Voltage over
Temperature
Ratio of Change in
Reference Voltage to
Cathode Voltage
Reference Input Current
Reference Input Current
Deviation over
Temperature
Off State Cathode
Current
Dynamic Output
Impedance
Minimum Operating
Current
V
Z
= V
REF
(circuit 1)
T
A
= +25°C to +85°C
T
A
= -40°C to +25°C
V
Z
from V
REF
to 10V
V
Z
from V
REF
to 36V
R1 =10kΩ, R2 =
∞Ω
(test circuit 2)
R1 =10kΩ, R2 =
∞Ω
T
A
= Full Range
(test circuit 2)
V
Z
= 36V, V
REF
= 0V
( test circuit 3)
f < 1KHz, V
Z
= V
REF
I
Z
=100µA to 100mA
(test circuit 1)
V
Z
= V
REF
(test circuit 1)
100
250
100
250
100
250
µA
Conditions
Min
2.489
AMS431A
Typ
Max
2.495
8.0
8.0
-0.5
-1.0
0.5
2.501
15
15
-2.7
-2.0
4.0
Min
2.483
AMS431B
Typ
2.495
8.0
8.0
-0.5
-1.0
0.5
Max
2.507
15
15
-2.7
-2.0
4.0
AMS431C
Min
Typ
Max
2.470
2.495
8.0
8.0
-0.5
-1.0
0.5
2.520
15
15
-2.7
-2.0
4.0
Units
V
mV
mV
mV/V
mV/V
µA
0.4
1.2
0.4
1.2
0.4
1.2
µA
µA
Ω
0.04
0.25
0.5
0.5
0.04
0.25
0.5
0.5
0.04
0.25
0.5
0.5
RECOMMENDED OPERATING CONDITIONS:
Min
V
REF
0.25mA
Max
36 V
120mA
Cathode Voltage, (V
Z
)
Cathode Current, (I
Z
)
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TEST CIRCUITS
V
IN
V
Z
= V
REF
V
IN
V
Z
V
IN
V
Z
I
REF
I
Z
V
REF
R1
I
REF
I
Z
I
Z
OFF
R2
V
REF
Figure 1.
Test Circuit for V
Z
=V
REF
Figure 2.
Test Circuit for V
REF
vs I
Z
.
Test circuit for I
REF
.
Figure 3.
Test Circuit for Off-State Current
TYPICAL APPLICATIONS
Single Supply Comparator with
Temperature Compensated Threshold
V
O
R1
V
REF
R2
IN
V
TH
≈
2.5V
V+
Shunt Regulator
V+
OUT
V
ON
≈
2V
V
OFF
= V+
V
O
≈
(1+R1/R2)V
REF
GND
Series Regulator
V+
V+
Higher Current Shunt Regulator
V
O
30Ω
R1
0.01µF
R1
V
O
R2
R1
V
O
≈
(1+R1/R2)V
REF
V
O
≈
(1+R1/R2)V
REF
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TYPICAL APPLICATIONS
(Continued)
Over Voltage/Under Voltage
Protection Circuit
V+
R1B
OUT ON
WHEN
LOW
<
V+
<
HIGH
LIMIT
LIMIT
Voltage Monitor
V+
R1B
R1A
R1A
R2A
R2B
R2A
R2B
LOW LIMIT
≈
V
REF
( 1+R1B/R2B)+V
BE
LOW LIMIT
≈
V
REF
( 1+R1A/R2A)
LOW LIMIT
≈
V
REF
( 1+R1B/R2B)+V
BE
LOW LIMIT
≈
V
REF
( 1+R1A/R2A)
LED ON WHEN
LOW LIMIT < V
+
< HIGH LIMIT
Delay Timer
V+
Current Limiter or Current Source
I
O
V+
R
CL
R
OFF
ON
C
DELAY = R*C*ln*V+/(V+)-V
REF
I
O
=V
REF
/R
CL
Constant Current Sink
V+
I
O
R
S
I
O
= V
REF
/R
S
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS431
TYPICAL PERFORMANCE CHARACTERISTICS
Input Current vs V
Τ
Α
= 25°C
V
Z
= V
REF
Z
Thermal Information
1000
REFERENCE VOLTAGE (V)
SOT-89
Input Current vs V
Z
150
INPUTT CURRENT (mA)
Τ
Α
= 25°C
V
Z
= V
REF
INPUTT CURRENT (µA)
500
400
300
200
100
0
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
I
Z
MIN
100
500
TO-92
SO-8
50
SOT-23
100
0
25
70 85
125
TEMPERATURE (° C)
0
1.0
2.0
CATHODE VOLTAGE (V)
3.0
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
0.060±0.005
(1.524±0.127)
DIA
0.180±0.005
(4.572±0.127)
0.060±0.010
(1.524±0.254)
0.180±0.005
(4.572±0.127)
0.90
(2.286)
NOM
0.140±0.010
(3.556±0.127)
5° NOM
0.500
(12.70)
MIN
10°
NOM
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSIONS
0.050±0.005
(1.270±0.127)
0.016±0.003
(0.406±0.076)
0.015±0.002
(0.381±0.051)
N (TO-92 ) AMS DRW# 042391
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
I am using AT89S52 MCU to count the number of external interrupts through buttons and display them in digital tube. After using this delay function, the digital tube display delay is very serious. I d...
I use a single-chip microcomputer to control MSP430f5438, a CC1101 to send data, and a CC1101 to receive data.But no matter how I send, I can only see 0F 00 00 00 in the rxBuffer of the receiving end....
I have a problem like this. The same hardware environment, the only difference is that the two CF memory cards are different. Using the same kernel, why can one system run normally, while the other ca...
[align=left][color=rgb(0, 0, 0)][backcolor=rgb(255, 255, 255)]1/Can hang U disk, need to lead out USB port, plug USB into computer, can read TF card drive letter, enter copy and delete operations (use...
Today I looked at the manual of MSP430FR5739, which talked about low-frequency oscillator XT1, high-frequency oscillator XT2, and digital control oscillator DCO. However, there was no explanation. Sin...
EtherCAT (Ethernet for Control Automation Technology) is a real-time industrial fieldbus communication protocol based on an Ethernet-based development framework. EtherCAT is one of the fastest indu...[Details]
The mass production process of the new generation of cockpit platform has started, and the smart cockpit market has entered a new bonus cycle of technology iteration and platform upgrade.
...[Details]
Current Development Status of DVR Market
A DVR, or digital video recorder, uses a hard disk for recording, unlike traditional analog video recorders. It's often called a DVR because it's a com...[Details]
Recently,
Xpeng Motors and Xinlian Integrated Circuit jointly announced the mass production of China's first hybrid silicon carbide product.
Designed and developed by Xpeng Motors and joint...[Details]
Definition of interactive projection system:
Interactive projection systems, also known as multimedia interactive projection, are available in floor, wall, and tabletop interactive projection....[Details]
In June 2014, the Ministry of Industry and Information Technology issued 4G FD-LTE licenses to China Unicom and China Telecom. Together with the 4G TD-LTE licenses issued to China Mobile, China Uni...[Details]
The 2025 China International Automotive Testing Exhibition will be held at the Shanghai World Expo Exhibition and Convention Center from August 27 to 29, 2025.
Clacton Seafront, UK, ...[Details]
On August 22, the Wall Street Journal reported on the 21st local time that the new US government does not plan to acquire equity in semiconductor wafer foundry giant TSMC and Micron, one of the thr...[Details]
According to Nikkei, a survey found that global electric vehicle battery supply is expected to reach more than three times the required quantity due to
cooling
demand for electric vehicles,...[Details]
Recently, Joyson Electronics has made positive progress in the core technology research and development of the robot's "brain and brain" and key components, and launched the industry's first integr...[Details]
According to foreign media reports, Ford Motor has applied to the U.S. Patent and Social Security Office (USPTO) for a patent for a door anti-collision system that may be used in future Ford vehicl...[Details]
Tiantai Robot's official Weibo account announced on the evening of August 20 that Tiantai Robot Co., Ltd., together with strategic partners including Shandong Future Robot Technology Co., Ltd., Sha...[Details]
Speaking of the problem of vehicle spontaneous combustion, whether it is a pure electric vehicle or a fuel vehicle, there will be incidents of spontaneous combustion. For the same spontaneous combu...[Details]
New version helps developers build secure and trustworthy embedded systems
Shanghai, China—August 21, 2025—
QNX, a division of BlackBerry Ltd., today announced the release of QNX...[Details]
Analog Devices held a third-quarter fiscal 2025 earnings conference call. Vincent T. Roche, CEO and Chairman of the Board, and Richard C. Puccio, Executive Vice President and Chief Financial Office...[Details]
51mcu
京公网安备 11010802033920号
EEWORLD
