Description
The SE431D is a low voltage three terminal
adjustable shunt regulator with a guaranteed
thermal
stability
over
applicable
temperature
ranges. The output voltage can be set to any value
between V
REF
(approximately 2.5 V) to 18V with two
external resistors. This device has a typical output
impedance of 0.08Ω.
Active output circuitry
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 0
o
C to 85
o
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.
Features
Low voltage operation (2.5V)
Adjustable output voltage V
0
= V
REF
to 18V
Wide operating current range 120μA to 90mA
Low dynamic output impedance 0.08Ω (Typ.).
Trimmed bandgap design up to + 0.5%.
ESD rating is 6KV(Per MIL-STD-883D).
RoHS Compliant and 100% Lead (Pb)-Free.
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 6/13/2007
All contents are subject to change without prior notice.
© 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
431Sx
(SE431DS)
431x
SE431
XXXX-LF
SE431
XXXX-LF
SE431
XXXX-LF
XXXX is the batch number.
Lead-free
package
is
Production Year Code
Lead-Free Package
The last character is the batch number.
Lead-free
package
is
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 6/13/2007
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 2
Absolute Maximum Ratings
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Current
Operating Junction Temperature Range
Storage Temperature Range
Symbol
V
KA
I
KA
I
REF
T
J
T
STG
Maximum
18
90
1
150
-65 to 150
120 (SOT-89)
230 (SOT-23-3)
Units
V
mA
mA
°C
°C
Thermal Resistance
θ
JA
230 (SOT-23-5L)
150 (SOP-8)
220 (TO-92)
°C/W
Lead Temperature (Soldering) 10 seconds
T
LEAD
260
°C
Electrical Characteristics
T
A
=25
℃
, unless otherwise
specified.
TEST
PARAMETER
0.5%
Reference Voltage
1%
2%
Deviation of reference voltage over full
temperature range
Ratio of change in reference voltage to the
change in cathode voltage
Reference current
Deviation of Reference current over full
temperature range
Minimum cathode current
for regulation
SYMBOL
CIRCUIT
TEST CONDITIONS
MIN
TYP
MAX
UNIT
2483
V
REF
1
V
KA
= V
REF
, I
KA
= 10mA
2495
2495
2495
-40
2507
2520
2545
--
mV
mV
2470
2445
V
I(dev)
1
V
KA
= V
REF
, I
KA
= 10mA
T
A
= 0°C to 85°C
I
KA
= 3mA,
ΔV
KA
= 10 V - V
REF
I
KA
= 10mA,
R1=10kΩ, R2 =
∞
I
KA
= 10mA, R1=10kΩ,
R2 =
∞,
T
A
= 0°C to 85°C
V
KA
= V
REF
V
KA
= 18V, V
REF
= 0
I
KA
= 1mA to
90mA,
--
Δ
V
REF
Δ
V
KA
I
REF
2
--
-0.2
-2.7
mV/V
2
--
0.3
4
μA
μA
mA
μA
Ω
I
I(dev)
I
MIN
I
OFF
Z
KA
2
1
3
1
--
--
--
--
-0.13
0.15
0.4
0.08
--
1
1
0.7
Off-state cathode current
Dynamic impedance
V
KA
= V
REF
, f
≤
1kH
Z
Revision 6/13/2007
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 3
Typical Performance Characteristics
CATHODE CURRENT
Vs.
CATHODE VOLTAGE
75
50
Cathode Current
VS.
Cathode Voltage
1200
VKA=Vref
TA=25
℃
V
KA
= Vref
Cathode Current (uA)
1
2
3
T
A
= 25
o
C
1000
800
600
400
200
0
Cathode Current (mA)
25
0
-25
-50
-75
-100
-2
-1
0
-200
-1
Cathode Voltage (V)
Cathode Voltage (V)
0
1
2
3
Reference Voltage VS. Junction Temperature
(V
KA
=V
REF
, I
KA
=10mA)
2.6
2.58
2.56
2.54
Reference Voltage (V)
2.52
2.5
2.48
2.46
2.44
2.42
2.4
-25
Iref VS. Temp
0.39
0.37
0.35
0.33
0.31
0.29
0.27
0.25
0.23
0.21
0.19
0
50
100
o
Reference Input Current (uA)
R1=10 kΩ
R2=∞
IKA=10mA
0
25
50
75
150
Junction Temperature (
℃
)
Juntion Temperature ( C)
Revision 6/13/2007
All contents are subject to change without prior notice.
© 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
Power Rating
(T
A
=25
°C
)
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
=50
°C
)
326mW
326mW
341mW
Power Rating
(T
A
=70
°C
)
239mW
239mW
250mW
435mW
435mW
455mW
Revision 6/13/2007
All contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2006. • www.seawardinc.com • Page 5
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