schematic diagram precision 1.25 volt micropower voltage reference issue 3 - february 1998 zra125 v r g nd device description the zra125 uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.25 volts. the device is available in small outline surface mount packages, ideal for applications where space saving is important, as well as packages for through hole requirements. the zra125 design provides a stable voltage without an external capacitor and is stable with capacitive loads. the zra125 is recommended for operation between 50 m a and 5ma and so is ideally suited to low power and battery powered applications. excellent performance is maintained to an absolute maximum of 25ma, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200ma. superior switching capability allows the device to reach stable operating conditions in only a few microseconds. features small outline sot23, so8 and to92 style packages no stabilising capacitor required typical t c 30ppm/c typical slope resistance 0.65 w 3%,2% and 1% tolerance industrial temperature range operating current 50 m a to 5ma transient response, stable in less than 10 m s optional extended current range applications battery powered and portable equipment. metering and measurement systems. instrumentation. data acquisition systems. precision power supplies. test equipment. 4-222
absolute maximum rating reverse current 25ma forward current 25ma operating temperature -40 to 85c storage temperature -55 to 125c power dissipation (t amb =25c) sot23 330mw e-line, 3 pin (to92) 500mw e-line, 2 pin (to92) 500mw so8 625mw reverse characteristics reverse voltage (v) re verse cu rrent ( m a) 0 0.2 0.4 0.8 1.4 0.6 1.0 0 10 20 30 40 50 60 t a =25c t a =- 4 0c t a =85c 1.2 zra125 electrical characteristics test conditions (unless otherwise stated) t amb =25c symbol parameter conditions limits tol. % units min typ max v r reverse breakdown voltage i r =150 m a 1.228 1.225 1.21 1.24 1.25 1.25 1.252 1.275 1.29 1 2 3 v i min minimum operating current 30 50 m a i r recommended operating current 0.05 5 ma t c ? average reverse breakdown voltage temp. co. i r(min) to i r(max) 30 90 ppm/c r s slope resistance 0.65 2 w z r reverse dynamic impedance i r =1ma f = 100hz i ac = 0.1 i r 0.5 1 w e n wideband noise voltage i r =150 m a f = 100hz to 10khz 60 m v(rms) ? t c = ( v r ( max ) - v r ( min ) ) x 1000000 v r x ( t ( max ) - t ( min ) ) note: v r(max) - v r(min) is the maximum deviation in reference voltage measured over the full operating temperature range. r s = v r change ( i r ( min ) to i r ( max )) i r ( max ) - i r ( min ) 4-223
1.24 1.23 1.22 1.21 1.27 1.26 1.25 typical characteristics forward characteristics forward current (ma) temperature (c) reference current (ma) frequency (khz) temperature drift slope resistance v current v in - (v ) v r - ( v ) f orw ard v ol ta ge ( v ) s lo p e re si sta n ce ( w ) time ( m s) transient response (i r =150 m m a) 110 0.1 t a =25c slope resistance v frequency -40 -20 0 20 40 60 80 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.1 1 10 100 1000 i r =150 m a to 5ma 0 0.5 1.0 t a =-40c t a =85c 1 0.1 10 100 1000 10 100 1 0.1 0.01 01 23 4 0 10 0 0.5 1.0 1.5 0 10 0 0.5 1.0 1.5 02 46 8 time ( m s) transient response (i r =5ma) i r =150 m a i r =1ma i r =5ma input output 58k input output 1k8 re f e ren ce v ol ta g e (v ) s lo p e re si st an ce ( w ) v in - (v) v r - (v ) zra125 4-224
so8 package suffix C n8 top view sot23 package suffix C f top view C pin 1 floating or connected to pin 2 e-line, 3 pin,rev package suffix C r bottom view C pin 3 floating or connected to pin 1 e-line, 2 pin package suffix C y bottom view connection diagrams zra125 e-line, 3 pin package suffix C a bottom view C pin 1 floating or connected to pin 3 4-225
part no tol % package partmark zra125a03 3 e-line zra12503 zra125a02 2 e-line zra12502 zra125a01 1 e-line zra12501 zra125f03 3 sot23 12a zra125f02 2 sot23 12b zra125f01 1 sot23 12d zra125n803 3 so8 zra12503 zra125n802 2 so8 zra12502 zra125n801 1 so8 zra12501 part no tol % package partmark zra125r03 3 e-line * zra125r3 zra125r02 2 e-line * zra125r2 zra125r01 1 e-line * zra125r1 zra125y03 3 e-line ? zra12503 zra125y02 2 e-line ? zra12502 zra125y01 1 e-line ? zra12501 * e-line 3 pin reversed ? e-line 2 pin e-line 3 pin zra125 ordering information 4-226
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