VERY LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
Description
NEW PRODUCT
ZXRE250/ZXRE252
VERY LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
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: VREF 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 (Top View)
ANODE 1
3 REF 2 CATHODE
SOT23 (Top View)
NC 1
Leave floating or connect to pin 5
2
CATHODE 3
5 ANODE 4 REF
SOT25 ZXRE252 (Top View)
ANODE 1
3 CATHODE 2 REF
SOT23
Notes: 1.
EU Directive 2002/95/EC (RoHS).
All applicable RoHS exemptions applied.
Please visit our website at http://www.
diodes.
com/products/lead_free.
html.
ZXRE250/ZXRE252
Document number: DS35228 Rev.
3 - 2
1 of 14 www.
diodes.
com
May 2011
© Diodes Incorporated
Absolute Maximum Ratings (Note 2)
ZXRE250/ZXRE252
VERY LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
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