Diodes ZXRE252 User Manual
Ne w p rod uct description, Features, Applications
ZXRE250/ZXRE252
VERY LOW CATHODE CURRENT ADJUSTABLE
PRECISION SHUNT REGULATOR
ZXRE250/ZXRE252
Document number: DS35228 Rev. 3 - 2
1 of 14
May 2011
© Diodes Incorporated
NE
W P
ROD
UCT
Description
The ZXRE250 and ZXRE252 are three terminal adjustable
shunt regulators offering excellent temperature stability and
output current handling capability up to 100mA. The output
voltage may be set to any chosen voltage between 2.5 and
36 volts by selection of two external divider resistors.
ZXRE250 has the same electrical specifications as the
industry standard ‘431 except that it features a very low
minimum cathode current for regulation. The typical value of
40µA makes the parts ideal for very low power applications.
The devices can be used as a replacement for zener diodes
in many applications requiring an improvement in zener
performance. The ZXRE250/2 is available in 2 grades with
initial tolerances of 1% and 0.5% for the A and B grades
respectively.
Features
• Minimum cathode current for regulation: 40μA (typ)
• Temperature range -40 to 125ºC
• Reference Voltage Tolerance at 25°C
o
ZXRE250A:
2.495V
± 1.0%.
o
ZXRE250B:
2.495V
± 0.5%
• Low Output Noise
• 0.2Ω Typical Output Impedance
• Sink Current Capability: 0.065mA to 100mA
• Adjustable Output Voltage: V
REF
to 36V
• SOT23 and SOT25: Available in “Green” Molding
Compound (No Br, Sb) and Lead Free Finish/ RoHS
Compliant (Note 1)
Applications
• Opto-Coupler
Linearisers
• Shunt
Regulators
• Improved
Zener
• Variable
Reference
Pin Assignments
ZXRE250
ZXRE252
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
ANODE
CATHODE
3
REF
SOT23
(Top View)
2
1
ANODE
CATHODE
3
REF
SOT23
(Top View)
2
1
NC
ANODE
CATHODE
5
REF
SOT25
(Top View)
4
2
3
1
Leave floating or
connect to pin 5
NC
ANODE
CATHODE
5
REF
SOT25
(Top View)
4
2
3
1
Leave floating or
connect to pin 5
ANODE
CATHODE
3
REF
SOT23
(Top View)
2
1
ANODE
CATHODE
3
REF
SOT23
(Top View)
2
1