Issue 2 - June 2006 1 www.zetex.com
© Zetex Semiconductors plc 2006
ZTLV431
1.24V Cost effective shunt regulator
Description
The ZTLV431 is a three terminal adjustable shunt regulator offering
excellent temperature stability and output current handling capability up to
20mA. The output voltage may be set to any chosen voltage between 1.24
volts and 10 volts by selection of two external divider resistors.
The ZTLV431 can be used as a replacement for zener diodes in many
applications requiring an improvement in zener performance.
The ZTLV431 is available as standard as an A grade which has an initial
tolerance of 1%; a B grade is planned with an initial tolerance of 0.5%,
and all cover the -40°C to 125°C temperature range as standard.
Features
• Low voltage operation VREF = 1.24V
• Temperature range -40 to 125°C
• Reference voltage tolerance at 25°C
• 0.5% ZTLV431B
• 1% ZTLV431A
• Typical temperature drift
• 4 mV (0°C to 70°C)
• 6 mV (-40°C to 85°C)
• 11mV (-40°C to 125°C)
•100A minimum cathode current
•0.25⍀ typical output impedance
• Adjustable output voltage 1.24V to 10V
Applications
• Opto-coupler linearization
• Linear regulators
• Improved Zener
• Variable reference
Ordering information
Tol. Order code Package Part mark Status (*)
NOTES:
(*) For availability of preview status devices contact your local Zetex sales representative
Reel size Tape width
(mm)
Quantity
per reel
1%
ZTLV431AE5TA SOT23-5 S1A Preview 7” (180mm) 8 3,000
ZTLV431AFTA SOT23 S1A Active 7” (180mm) 8 3,000
ZTLV431AFFTA SOT23F S1A Preview 7” (180mm) 8 3,000
0.5%
ZTLV431BE5TA SOT23-5 S1B Preview 7” (180mm) 8 3,000
ZTLV431BFTA SOT23 S1B Preview 7” (180mm) 8 3,000
ZTLV431BFFTA SOT23F S1B Preview 7” (180mm) 8 3,000
1Ref
ZTLV431_F (SOT23)
(top view)
Pin connections
Cathode 2
3 Anode
1Ref
ZTLV431_FF (SOT23F)
(top view)
Cathode 2
3 Anode
Preview
ZTLV431_E5 (SOT23-5)
(top view)
N/C
N/C
Cathode
Anode
Ref
1
2
3
5
4
Preview
ZTLV431
Issue 2 - June 2006 2 www.zetex.com
© Zetex Semiconductors plc 2006
Absolute maximum ratings
Operation above the absolute maximum rating may cause device failure. Operation at the
absolute maximum ratings, for extended periods, may reduce device reliability.
Unless otherwise stated voltages specified are relative to the ANODE pin.
Package thermal data
Recommended operating conditions
Cathode voltage (VKA) 10V
Continuous cathode current (IKA) -20 to 20mA
Reference input current range (IREF) -0.05 to 3mA
Operating junction temperature -40 to 150°C
Storage temperature -55 to 150°C
Package ⍜JA PDIS
TA =25°C
SOT23-5 250°C/W 500 mW
SOT23 380°C/W 330 mW
SOT23F 160°C/W 780 mW
Min. Max. Units
VKA cathode voltage VREF 10 V
IKA cathode current 0.1 15 mA
TA operating ambient temperature range -40 125 °C
ZTLV431
Issue 2 - June 2006 3 www.zetex.com
© Zetex Semiconductors plc 2006
Electrical characteristics (electrical characteristics over recommended operating
conditions, TA = 25°C, KKA = VREF
, IKA = 10mA unless otherwise stated)
Deviation of reference input voltage, VDEV
, is defined as the maximum variation of the reference
input voltage over the full temperature range.
The average temperature coefficient of the reference input voltage, VREF is defined as:
The dynamic output impedance, ZKA, is defined as:
When the device is programmed with two externalresistors, R1
and R2, (fig 2) , the dynamic output impedance of the overall
circuit, Z’, is defined as:
Symbol Parameter Conditions Min. Typ. Max. Units
VREF Reference voltage
ZTLV431A 1.228 1.24 1.252
V
ZTLV431B 1.234 1.24 1.246
TA = -40 to 85°C ZTLV431A 1.215 1.265
ZTLV431B 1.224 1.259
T
A
= -40 to 125°C
ZTLV431A 1.209 1.271
ZTLV431B 1.221 1.265
VREF(dev)
Deviation of reference
voltage over full
temperature range
TA = 0 to 70°C 4 12
mV
TA = -40 to 85°C 6 20
T
A
= -40 to 125°C
11 31
Ratio of change in
reference voltage to
the change in cathode
voltage
V
KA
from V
REF
to
I
KA
= 10mA
6V -1.5 -2.7
mV/V
10V -1.5 -2.7
IREF
Reference input current
IKA = 10mA, R1 = 10k⍀., R2 = OC 0.1 0.5 µA
IREF(dev)
IREF deviation over full
temperature range
IKA = 10mA,
R1 = 10k⍀,
R2 = OC
TA = 0 to 70°C 0.05 0.3
µA
TA = -40 to 85°C 0.1 0.4
T
A
= -40 to 125°C
0.15 0.5
IKMIN Minimum cathode
current for regulation
VKA = VREF
T
A
= -40 to 125°C
55 100 µA
IK(OFF) Off-state current VKA = 10V, VREF =0V 10 30 µA
zKA Dynamic output
impedance
VKA = VREF
, f = <1kHz,
IK = 0.1 to 15mA
0.25 0.4 ⍀
∆VREF
∆VKA
-----------------
Vmax
Vmin
T1 T2
Vdev =V
max -V
min
Temperature
VREF
ppm
°C
------------- ⎠
⎞
⎝
⎛VDEV x1000000
VREF T1T2
–()
------------------------------------------
=
ZKA
∆VK
∆IK
----------=
Z′ZKAx1R1
R2
-------+()=
ZTLV431
Issue 2 - June 2006 6 www.zetex.com
© Zetex Semiconductors plc 2006
Package outline - SOT23
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Dim. Millimeters Inches Dim. Millimeters Inches
Min. Max. Min. Max. Min. Max. Max. Max.
A 2.67 3.05 0.105 0.120 H 0.33 0.51 0.013 0.020
B 1.20 1.40 0.047 0.055 K 0.01 0.10 0.0004 0.004
C - 1.10 - 0.043 L 2.10 2.50 0.083 0.0985
D 0.37 0.53 0.015 0.021 M 0.45 0.64 0.018 0.025
F 0.085 0.15 0.0034 0.0059 N 0.95 NOM 0.0375 NOM
G 1.90 NOM 0.075 NOM - - - - -
L
N
H
G
A
C
F
B
M
K
D
3 leads
ZTLV431
Issue 2 - June 2006 7 www.zetex.com
© Zetex Semiconductors plc 2006
Package outline - SOT23F
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Dim. Millimeters Inches Dim. Millimeters Inches
Min. Max. Min. Max. Min. Max. Max. Max.
A 0.80 1.00 0.031 0.0394 E 2.30 2.50 0.0906 0.0984
A1 - 0.10 0.00 0.0043 E1 1.50 1.70 0.0590 0.0669
A2 0.06 0.16 0.0024 0.0006 E2 1.10 1.26 0.0433 0.0496
b 0.39 0.41 0.0153 0.0161 L 0.48 0.68 0.0189 0.0268
c 0.11 0.20 0.0043 0.0079 L1 0.39 0.41 0.0153 0.0161
D 2.80 3.00 0.1102 0.1181 R 0.05 0.15 0.0019 0.0059
e 0.95 ref 0.0374 ref O 0° 12° 0° 12°
e1 1.90 ref 0.7480 ref - - - - -
D
L1
c
A1
A2
b
R
bb
E1 E
e1
e
L
A
E2
ZTLV431
Issue 2 - June 2006 8 www.zetex.com
© Zetex Semiconductors plc 2006
For international sales offices visit www.zetex.com/offices
Zetex products are distributed worldwide. For details, see www.zetex.com/salesnetwork
This publication is issued to provide outline information only which (unless agreed by the company in writing) may not be used, applied or
reproduced for any purpose or form part of any order or contact or be regarded as a representation relating to the products or services concerned.
The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
Europe
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Americas
Zetex Inc
700 Veterans Memorial Highway
Hauppauge, NY 11788
USA
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
usa.sales@zetex.com
Asia Pacific
Zetex (Asia Ltd)
3701-04 Metroplaza Tower 1
Hing Fong Road, Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
Corporate Headquarters
Zetex Semiconductors plc
Zetex Technology Park, Chadderton
Oldham, OL9 9LL
United Kingdom
Telephone: (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
Package outline - SOT23-5
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
DIM Millimeters Inches
Min. Max. Min. Max.
A 0.90 1.45 0.0354 0.0570
A1 0.00 0.15 0.00 0.0059
A2 0.90 1.30 0.0354 0.0511
b 0.20 0.50 0.0078 0.0196
C 0.09 0.26 0.0035 0.0102
D 2.70 3.10 0.1062 0.1220
E 2.20 3.20 0.0866 0.1181
E1 1.30 1.80 0.0511 0.0708
e 0.95 REF 0.0374 REF
e1 1.90 REF 0.0748 REF
L 0.10 0.60 0.0039 0.0236
a° 0° 30° 0° 30°
