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zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 1 of 14 www.diodes.com may 2011 ? diodes incorporated new product description the zxre250 and zxre252 are three terminal adjustable shunt regulators offering excelle nt temperature stability and output current handling capab ility 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 40a 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: 40 a (typ) ? temperature range -40 to 125oc ? reference voltage tolerance at 25c o zxre250a: 2.495v 1.0%. o zxre250b: 2.495v 0.5% ? low output noise ? 0.2 ? 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 http://www.diodes .com/products/lead_free.html . a node cathode 3ref sot23 (top view) 2 1 a node cathode 3ref 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 a node cathode 3 ref sot23 (top view) 2 1 a node cathode 3 ref sot23 (top view) 2 1
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 2 of 14 www.diodes.com may 2011 ? diodes incorporated new product absolute maximum ratings (note 2) symbol parameter rating unit v ka cathode voltage 40 v i ka continuous cathode current 150 ma i ref reference input current -0.050 to +10 ma t j operating junction temperature +150 c t st storage temperature -55 to +150 c p d power dissipation (notes 3, 4) sot23 330 mw sot25 500 mw notes: 2. 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 stat ed voltages specified are relative to the anode pin. 3. t j , max =150c. 4. ratings apply to ambient temperature at 25c. recommended operating conditions symbol parameter min max unit v ka cathode voltage v ref 36 v i ka cathode current 0.065 100 ma t a operating ambient tem perature -40 125 c
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 3 of 14 www.diodes.com may 2011 ? diodes incorporated new product electrical characteristics (t a = +25c, unless otherwise noted) symbol parameter test conditions min typ. max unit v ref reference voltage v ka = v ref , i ka = 10ma zxre250a 2.470 2.495 2.520 v zxre250b 2.482 2.495 2.507 v v dev deviation of reference voltage over full temperature range (note 5) v ka = v ref , i ka = 10ma t a = 0 to 70 o c 6 16 mv t a = -40 to 85 o c 14 34 mv t a = -40 to 125 o c 14 34 mv v ref v ka ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma v k a = 10v to v ref -1.4 -2.7 mv/v v ka = 36v to 10v -1 -2 mv/v i ref reference input current i ka = 10ma, r1 = 10k ? , r2 = 1 4 a i ref i ref deviation over full temperature range (note 5) i ka = 10ma, r1 = 10k ? , r2 = t a = 0 to 70 o c 0.8 1.2 a t a = -40 to 85 o c 0.8 2.5 a t a = -40 to 125 o c 0.8 2.5 a i ka(min) minimum cathode current for regulation v ka = v ref 40 65 a i ka ( off ) off-state current v k a = 36v, v ref = 0v 0.05 0.5 a |z ka | dynamic output impedance (note 6) v k a = v ref , f = 0hz 0.2 0.5 ? ja thermal resistance junction to ambient sot23 380 o c/w sot25 250 o c/w notes: 5. deviation of v dev , and i ref are defined as the maximum variation of the values over the full temperature range. the average temperature coefficient of the reference input voltage v ref is defined as: where: t2 ? t1 = full temperature change. v ref can be positive or negative dependi ng on whether the slope is positive or negative. notes: 6. the dynamic output impedance, r z , is defined as: when the device is programmed with two external resistors r1 and r2, the dynamic output impedance of the overall circuit, is defined as: = t2 ? t1 v ref v dev v ref @ 25oc x 10 6 ppm/oc = t2 ? t1 v ref v dev v ref @ 25oc x 10 6 ppm/oc vmax vmin t1 t2 v dev = vmax - vmin temperature vmax vmin t1 t2 v dev = vmax - vmin temperature = z ka v ka i ka = z ka v ka i ka = z? v i z ka 1 + r1 r2 = z? v i = z? v i z ka 1 + r1 r2 z ka 1 + r1 r2
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 4 of 14 www.diodes.com may 2011 ? diodes incorporated new product test circuits figure 1. test circuit for v ka = v ref figure 2. test circuit for v ka > v ref figure 3. test circuit for i off
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 5 of 14 www.diodes.com may 2011 ? diodes incorporated new product typical performance characteristics 2400 2420 2440 2460 2480 2500 2520 2540 2560 2580 2600 -55 -35 -15 5 25 45 65 85 105 125 t free air temperature ( c ) r eference voltage vs. free air temperature a v reference voltage (mv) ref i = 10ma v = v t = 25c ka ka re f a 0 0.05 0.1 0.15 0. 2 -55 -35 -15 5 25 45 65 85 105 125 t free air temperature ( c) reference current vs. free air temperature a i reference current ( a) ref r1 = 10k r2 = i = 10ma ka -100 -50 0 50 100 150 -2 -1 0 12 3 v cathode voltage (v) c athode current vs. c athode voltage ka i cathode current (ma) ka v = v t = 25c ka re f a -100 0 100 200 -2 -1 0 12 3 v cathode voltage cathode current vs. c athode voltage ka i kmin i cathode current ( a) ka v = v t = 25c ka re f a
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 6 of 14 www.diodes.com may 2011 ? diodes incorporated new product typical performance characteristics (cont.) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 -75 -50 -25 0 25 50 75 100 125 t free air temperature ( c) off-state cathode current vs. free air temperature a i off-state cathode current ( a) koff v = 36v v= 0 ka ref -1.0 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0. 2 -50 -25 0 25 50 75 100 125 v = 3v t o 36 v ka t free air temperature (c) r atio of delta reference voltage to delta cathode voltage vs. free air temperature a dv /dv (mv/v) ref ka 200 220 240 260 280 300 320 340 360 380 400 10 100 1k 10k 100k f- frequency (hz) equivalent input noise voltage vs. frequency v = equivalent input noise voltage nv/ hz n i = 10ma v = v t = 25c ka ka re f a
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 7 of 14 www.diodes.com may 2011 ? diodes incorporated new product typical performance characteristics (cont.) -15 -10 -5 0 5 10 1 5 012345678910 time (seconds) equivalent input noise voltage over a 10-s period vn - equivalent input noise voltage - v i = 10ma v = v t = 25c ka ka re f a figure 4. test circuit for noise input voltage
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 8 of 14 www.diodes.com may 2011 ? diodes incorporated new product typical performance characteristics (cont.) 0 10 20 30 40 50 60 70 100 1k 10k 100k 1m 10m f frequency (hz) small-signal voltage amplification vs. frequency a small-signal voltage amplification (db) v i = 10ma t = 25c ka a test circuit for voltage amplification 0.0 0.1 1.0 10.0 100.0 1k 10k 100k 1m 10m z reference impedance ( ) ka i = 10ma t = 25c ka a f frequency (h z) r eference impedance vs. frequency test circuit for reference impedance
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 9 of 14 www.diodes.com may 2011 ? diodes incorporated new product typical performance characteristics (cont.) 0 1 2 3 4 5 6 01 2 345678910 t time ( s) pulse response input and output voltage (v) output inp ut t = 25c a test circuit for pulse response 0 10 20 30 40 50 60 70 80 90 100 0.00001 0.0001 0.001 0.01 0.1 1 d c -load capacitance - uf stability boundary conditions l i - c athode current - ma ka a v = v b v = 5v c v = 10v d v = 15v ka ref ka ka ka sta b le sta b le sta b le d c cb b a 10 t = 25c a test circuit for curve a test circuit for curves b, c, d test circuit for curves b, c, d the device is stable under all conditions with a load capacitanc e not exceeding 50pf. the devic e is stable under all conditions with a load capacitance between 5nf and 20nf. the device is stable under all conditions with a load capacit ance exceeding 300nf. with a cat hode current not exceeding 5ma, the device is stable with any load capacitance .
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 10 of 14 www.diodes.com may 2011 ? diodes incorporated new product applications information ? series regulator output control of a three terminal fixed regulator single supply comparator with temperature compensated threshold over voltage / under voltage protection circuit higher current shunt regulator shunt regulator
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 11 of 14 www.diodes.com may 2011 ? diodes incorporated new product ordering information device (note 7) package code packaging (note 5) 7? tape and reel ammo box quantity part number suffix quantity part number suffix zxre250a(b)sa-7 sa sot23 3000/tape & reel -7 na na zxre250a(b)w5-7 w5 sot25 3000/tape & reel -7 na na zxre252a(b)sa-7 sa sot23 3000/tape & reel -7 na na notes: 7. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. 8. suffix (b) denotes zxre250b (0.5% tolerance) device. pinout variation tolerance package packing 0: standard pinout 2: reversed pinout in sot23 a: 1.0% b: 0.5% sa: sot23 w5: sot25 7: tape & reel zxre25 x x xx -7 pinout variation tolerance package packing 0: standard pinout 2: reversed pinout in sot23 a: 1.0% b: 0.5% sa: sot23 w5: sot25 7: tape & reel zxre25 x x xx -7
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 12 of 14 www.diodes.com may 2011 ? diodes incorporated new product marking information (1) sot23 1 2 3 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week device package identification code zxre250asa sot23 da zxre250bsa sot23 db zxre252asa sot23 fa zxre252bsa sot23 fb (2) sot25 1 2 3 5 7 4 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week device package identification code zxre250aw5 sot25 da zxre250bw5 sot25 db
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 13 of 14 www.diodes.com may 2011 ? diodes incorporated new product package outline dimensions (all dimensions in mm) (1) package type: sot25 (2) package types: sot23
zxre250/zxre252 very low cathode cu rrent adjustable precision shunt regulator zxre250/zxre252 document number: ds35228 rev. 3 - 2 14 of 14 www.diodes.com may 2011 ? diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2011, diodes incorporated www.diodes.com

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