Description
The SE431D is a low voltage three terminal
adjustable shunt regulator with a guaranteed
thermal
stability
over
applicable
temperature
Features
Low voltage operation (2.5V)
Wide operating current range 150µA to 150 mA
Low dynamic output impedance 0.08(Typ.).
Trimmed bandgap design up to + 0.5%.
Electrostatic discharge voltage 2.5kV.
ranges. The output voltage can be set to any value
between V
REF
(approximately 2.5 V) to 36V with two
external resistors. This device has a typical output
impedance of 0.08Ω.
Active output circuitry
RoHS Compliant and 100% Lead (Pb)-Free.
provides a very sharp turn on characteristic, making
this device excellent replacement for Zener diodes
in many applications.
The SE431D is characterized for operation
from -40 C to 125 C, and five package options
(SOT-23-3, SOT-23-5, SOP-8, TO-92 and SOT-89)
allow the designer the opportunity to select the
proper package for their applications.
o
o
Application
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
Block Diagram
Cathode
Symbol Diagram
Cathode
Ref
+
-
Ref
Vref
Anode
Anode
Revision 7/30/2014
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© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 1
Marking Information
Package
SOT-23-3
SC59-3L
SOT-23-3
SOT-23-5L
SOP-8
Marking
431x
Lead-free
431Sx
(SE431DS)
431x
SE431
XXXX-LF
SE431
XXXX-LF
SE431
XXXX-LF
XXXX is the batch number.
Lead-free
package
is
Production Batch Number
Lead-Free Package
package
is
The last character is the batch number.
indicated by a dot on top
of the last character.
SOT-89
indicated by LF after XXXX.
TO-92
Pin Configuration
SOT-23-3
SOT-23-3L (SC59-3L)
SOT-23-3
(Order as SE431DS)
SOT-23-5L
TO-92
SOP-8
(Top View)
SOT-89
Revision 7/30/2014
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© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 2
Absolute Maximum Ratings
(Over operating free-air temperature range, unless otherwise noted)
Parameter
Cathode Voltage
Symbol
V
KA
Maximum
40
150
10
-40 to 125
-65 to 150
260
Units
V
mA
mA
°C
°C
°C
The voltage values are with respect to the anode terminal unless otherwise noted.
Continuous Cathode Current
Reference Current
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 seconds
I
KA
I
REF
T
J
T
STG
T
LEAD
RECOMMENDED OPERATING CONDITIONS
Parameter
Cathode Vltage, V
KA
Cathode Crrent, I
K
(for regulation )
MIN
V
REF
0.3
MAX
36
100
UNIT
V
mA
Electrical Characteristics
T
A
=25℃, unless otherwise
specified.
TEST
PARAMETER
SYMBOL
CIRCUIT
0.5%
Reference Voltage
1%
2%
Deviation of reference voltage over full
temperature range
V
KA
= V
REF
, I
KA
= 10mA
2483
2495
2495
2495
2507
2520
2545
mV
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
REF
1
V
KA
= V
REF
, I
KA
= 10mA
2470
2445
V
I(dev)
1
T
A
= 0°C to 125°C
--
8
17
mV
Ratio of change in reference voltage to the
change in cathode voltage
∆
V
REF
∆
V
KA
I
REF
I
KA
= 3mA,
2
∆V
KA
= 10 V - V
REF
--
0.2
2.7
mV/V
I
KA
= 10mA,
Reference current
2
R1=10kΩ, R2 =
∞
I
KA
= 10mA, R1=10kΩ,
R2 =
∞,
T
A
= 0°C to 125°C
V
KA
= V
REF
V
KA
= 36 V, V
REF
= 0
I
KA
= 1mA to 100mA,
--
0.3
4
µA
Deviation of Reference current over full
temperature range
Minimum cathode current for regulation
Off-state cathode current
I
I(dev)
I
MIN
I
OFF
Z
KA
2
1
3
1
--
0.13
4
µA
--
--
0.15
0.4
0.3
1
mA
µA
Ω
Dynamic impedance
V
KA
= V
REF
, f
≤
1kH
Z
--
0.08
0.7
Revision 7/30/2014
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© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 3
Typical Performance Characteristics
CATHODE CURRENT
Vs.
CATHODE VOLTAGE
1200
75
Cathode Current
VS.
Cathode Voltage
VKA=Vref
TA=25
℃
Cathode Current (uA)
1
2
3
V
KA
= Vref
50
T
A
= 25
o
C
1000
800
600
400
200
0
-200
Cathode Current (mA)
25
0
-25
-50
-75
-100
-2
-1
0
-1
0
1
2
3
Cathode Voltage (V)
Cathode Voltage (V)
Revision 7/30/2014
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© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 4
Test Circuits
Input
V
KA
Input
I
KA
V
KA
Input
V
KA
I
off
I
KA
R1
Iref
Vref
R2
Vref
R1
V
KA
= Vref (1+
) + Iref x R1
R2
Test Circuit 1:
V
KA
= V
REF
Test Circuit 2:
V
KA
> V
REF
Test Circuit 3:
Off State Current
Application Diagram
Thermal Consideration
Package
SOT-23-3
(θ
JA
=230°C/W)
SOT-23-5L
(θ
JA
=230°C/W)
TO-92
(θ
JA
=220°C/W)
1. Maximum junction temperature is 125°C
2. θ
JA
is measured with packages mounted onboard under still-air condition with 1W power applied.
3. Power rating is calculated using P
D
= (T
J
– T
A
) /θ
JA,
where T
J
denotes junction temperature and T
A
denotes ambient temperature.
Power Rating
(T
A
=25
°C
)
435mW
435mW
455mW
Power Rating
(T
A
=50
°C
)
326mW
326mW
341mW
Power Rating
(T
A
=70
°C
)
239mW
239mW
250mW
Revision 7/30/2014
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 5
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