1/9 n 1.225v typ output voltage n ultra low operating current : 45 m a maximum at 25 c n high precision @ 25 c +/- 2% (standard version) +/- 1% (a grade) +/- 0.5% (b grade) n high stability when used with capacitive loads n industrial temperature range: -40 to +85 c n 120ppm/ c maximum temperature coefficient description the ts821 is a low power shunt voltage reference providing a stable 1.225v output voltage over the industrial temperature range (-40 to +85 c). avail- abe in sot23-3 surface mount package, it can be designed in applications where space saving is a critical issue. the low operating current is a key advantage for power restricted designs. in addition, the ts821 is very stable and can be used in a broad range of application conditions. application n computers n instrumentation n battery chargers n switch mode power supply n battery operated equipments order code z= to92 plastic package - also available in bulk (z), tape & reel (zt) and ammo pack (ap) lt = tiny package (sot23-3) - only available in tape & reel (lt) pin connections (top view) precision to92 sot23-3 sot23 marking 2% ts821iz ts821ilt l213 1% ts821aiz ts821ailt l212 0.5% ts821biz ts821bilt l211 single temperature range: -40 to +85 c z to-92 (plastic package) l sot23-3l (plastic micropackage) ts821 1.225v micropower shunt voltage reference march 2002
ts821 2/9 absolute maximum ratings operating conditions electrical characteristics ts821 (2% precision) t amb =25 c (unless otherwise specified) symbol parameter value unit i k reverse breakdown current 20 ma i f forward current 10 ma p d power dissipation 1) sot23-3 to92 360 625 mw t std storage temperature -65 to +150 c esd human body model (hbm) 2 kv machine model (mm) 200 v t lead lead temperature (soldering, 10 seconds) 260 c 1. pd has been calculated with t amb =25 c and t j = 150 c and rthja = 200 c/w for the to92 package rthja = 340 c/w for the sot23-3l package symbol parameter value unit i min minimum operating current 45 m a i max maximum operating current 12 ma t oper operating free air temperature range -40 to +85 c symbol parameter test condition min. typ. max. unit vk reverse breakdown voltage i k = 100 m a 1.200 1.225 1.250 v reverse breakdown voltage tolerance i k = 100 m a -40 c ts821 3/9 electrical characteristics ts821a (1% precision) t amb =25 c (unless otherwise specified) electrical characteristics ts821b (0.5% precision) t amb =25 c (unless otherwise specified) symbol parameter test condition min. typ. max. unit vk reverse breakdown voltage i k = 100 m a 1.213 1.225 1.237 v reverse breakdown voltage tolerange i k = 100 m a -40 c ts821 4/9 reference voltage versus cathode current test circuit static impedance versus temperature reference voltage versus cathode current reference voltage versus temperature noise voltage versus frequency -1 -0.5 0 0.5 1 1.5 reference voltage (v) -8 -4 0 4 8 12 cathode current (ma) ik=(vin-vref)/r vout=vref r -40 -20 0 20 40 60 80 temperature ( c) 0.2 0.21 0.22 0.23 0.24 0.25 static impedance (ohms) -1 -0.5 0 0.5 1 1.5 reference voltage (v) -50 0 50 100 cathode current ( m a) -40 -20 0 20 40 60 80 temperature ( c) 1.19 1.2 1.21 1.22 1.23 1.24 1.25 1.26 cathode voltage (v) +0.5% -0.5% -1% +1% -2% +2% 0 1 10 100 1,000 10,000 frequency(hz) 0 100 200 300 400 500 600 700 800 noise voltage (nv/vhz) c l =10 m f c l =0 m f c l =100 m f
ts821 5/9 pulse response for ik=100 m a pulse response for ik=1ma test circuit for pulse response at ik=100 m a test circuit for pulse response at ik=1ma 0246810 time ( m s) 3v 0v 1.225v input output 0v 0246810 time ( m s) 3v 0v 1.225v input output 0v ik=100 m a output 18 k w pul se gener at or intput ik=1ma output 1.8 k w pulse generat or intput
ts821 6/9 package mechanical data 3 pins - plastic package to92 (tape & reel) dim. millimeters inches min typ. max. min. typ. max. al 5.0 0.197 a 5.0 0.197 t 4.0 0.157 d 0.45 0.018 i1 2.5 0.098 p 11.7 12.7 13.7 0.461 0.500 0.539 po 12.4 12.7 13 0.488 0.500 0.512 p2 5.95 6.35 6.75 0.234 0.250 0.266 f1/f2 2.4 2.5 2.8 0.094 0.098 0.110 d h -1 0 1 -0.039 0 0.039 d p -1 0 1 -0.039 0 0.039 w 17.5 18.0 19.0 0.689 0.709 0.748 w0 5.7 6 6.3 0.224 0.236 0.248 w1 8.5 9 9.75 0.335 0.354 0.384 w2 0.5 0.020 h 20 0.787 h0 15.5 16 16.5 0.610 0.630 0.650 h1 25 0.984 do 3.8 4.0 4.2 0.150 0.157 0.165 l1 11 0.433 a1 p p a t h h1 h l1 d i1 h0 w2 w0 w1 w d0 f1 f2 p2 p0
ts821 7/9 package mechanical data 3 pins - plastic package to92 (tape ammo pack) dim. millimeters inches min typ. max. min. typ. max. al 5.0 0.197 a 5.0 0.197 t 4.0 0.157 d 0.45 0.018 i1 2.5 0.098 p 11.7 12.7 13.7 0.461 0.500 0.539 po 12.4 12.7 13 0.488 0.500 0.512 p2 5.95 6.35 6.75 0.234 0.250 0.266 f1/f2 2.4 2.5 2.8 0.094 0.098 0.110 d h -1 0 1 -0.039 0 0.039 d p -1 0 1 -0.039 0 0.039 w 17.5 18.0 19.0 0.689 0.709 0.748 w0 5.7 6 6.3 0.224 0.236 0.248 w1 8.5 9 9.75 0.335 0.354 0.384 w2 0.5 0.020 h 20 0.787 h0 15.5 16 16.5 0.610 0.630 0.650 h1 25 0.984 do 3.8 4.0 4.2 0.150 0.157 0.165 l1 11 0.433 a1 p p a t h h1 h l1 d i1 h0 w2 w0 w1 w d0 f1 f2 p2 p0
ts821 8/9 package mechanical data 3 pins - plastic package to92 (bulk) dim. milli meters inches min typ. max. min. typ. max. l 1.27 0.05 b 3.2 3.7 4.2 0.126 0.1457 0.1654 o1 4.45 5.00 5.2 0.1752 0.1969 0.2047 c 4.58 5.03 5.33 0.1803 0.198 0.2098 k 12.7 0.5 o2 0.407 0.5 0.508 0.016 0.0197 0.02 a 0.35 0.0138
ts821 9/9 package mechanical data 3 pins - tiny package (sot23-3) dimensions millimeters inches min. typ. max. min. typ. max. a 0.890 1.120 0.035 0.044 a1 0.010 0.100 0.0004 0.004 a2 0.880 0.950 1.020 0.037 0.040 b 0.300 0.500 0.012 0.020 c 0.080 0.200 0.003 0.008 d 2.800 2.900 3.040 0.110 0.114 0.120 e 2.100 2.640 0.083 0.104 e1 1.200 1.300 1.400 0.047 0.051 0.055 e 0.950 0.037 e1 1.900 0.075 l 0.400 0.500 0.600 0.016 0.020 0.024 l1 0.540 0.021 k0 8 a a1 a2 d e e1 b e e1 0.10 c c seating plane l1 l 0.25 gauge plane c k information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibil ity for the consequences of use of such information nor for any infring ement of patents or other righ ts of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change witho ut notice. this publ ication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life suppo rt devices or systems withou t express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia malta - morocco - singapore - spain - sweden - swit zerland - united kingdom - united states ? http://www. st.com
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