date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 1 features voltage tolerance........................1% and 2% wide operating curren..........100 a to 15ma low temperature coefficient.........50ppm/ c fixed reverse breakdown voltage.......1.24v no output capacitance required two terminal "zener" operation improved replacement for tl431 precision 1.24v shunt voltage reference spx4041 the spx4041 is a 2-terminal, temperature compensated, band-gap voltage reference which provides a fixed 1.24v output for input currents between 160 a and 15ma. the bandgap voltage (1.24v) is independently laser trimmed from the output voltage to achieve a very low temperature coefficient, then the output voltage is trimmed to 1.24v. this trimming technique and the low temperature coefficient (a grade: 50 ppm/ c) thin film resistor process gives a very stable device over the full temperature range. the spx4041 is available in the sub miniature 3 pin sot-23, 3 pin to-92 or 8 pin nsoic packages. the operating temperature is -40 c to 85 c. the spx4041 advanced design eliminates the need for an external stabilized capacitor while insuring stability with any capacitive load, making it easy to use. figure 1: block diagram applications constant current source digital voltmeter power management precision regulators anode (a) cathode (k) 1.24v + - description typical applications circuit now available in lead free packaging battery powered equipment instrumentation automotive electronics data acquisition systems 1 2 3 4 5 6 7 8 spx4041 8 pin nsoic cathode n/c anode n/c n/c n/c n/c n/c
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 2 absolute maximum ratings stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maxi- mum rating conditions for extended periods may affect reliability. electrical characteristics i in = 1000 a, t a = 25 c, unless otherwise specified. reverse current (i ka )) ...................................... 20ma forward current (i ak ) ....................................... 10ma operating temperature range (t a ) ...... -40 to +85 c junction temperature (t j ) .............................. 150 c storage temperature (t stg ) ................ - 65 to 150 c lead temperature (soldering 10 sec.), t l ......... 300 c *calculating average temperature coefficient (tc) ? t ? v ka 015304 5607590105 -5 0.5 5000 0 00 27 ppm/c tc in mv /c = tc in % /c = ? v ka (mv) ? t a ? t a ? v ka at 25c ? v ka x 100 () tc in ppm/c = ? t a ? v ka at 25c ? v ka x10 6 () ppm % mv junction temperature (c) 0.033 mv/ c 0.0027 %/ c figure 2. v ref vs. temperature parameter conditions min. typ. max min. typ. max. unit reverse breakdown voltage i r =500 a 1.24 1.24 v reverse breakdown i r =500 a 12 25 mv tolerance -40 c t a 85 c 29 49 dynamic output impedance 0.60 2.00 0.60 2.00 ? noise voltage 0.1khz f 10hz 15 15 v pp temperature coefficient note 1 100 100 ppm/ c turn-on setting 0.1% of v out 30 30 s temperature range (t a ) -40 85 -40 85 c operating current range 0.5 5.0 0.5 5.0 ma 15.0 15.0 thermal resistance to-92 ja 160 160 c/w to-92 jc 80 80 soic-8 ja 175 175 soic-8 jc 45 45 sot-23 ja 575 575 sot-23 jc 150 150 note 1. three-point measurement guarantees the error band over the specified temperature range. spx4041a spx4041
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 3 figure 3. test circuit for v ka =v ref figure 4. high current operating characteristics figure 5. reference voltage vs. ambient temperature figure 6. low current operating characteristics v in v ka i k -2 -1 0123 0 i k - cathode current (ma) v ka - cathode voltage (v) t emperature range: 0 c to 105 c 15.0 12.5 10.0 7.5 5.0 2.5 -2.5 -5.0 -7.5 -10.0 1.24 v ref - reference voltage (v) t a - ambient temperature (c) -60 i k = 10ma 1.20 1.21 1.22 1.23 1.24 1.25 1.26 -30 0 30 60 90 900 800 700 600 500 400 300 200 100 0 -100 -200 -1.0 0 = 105 c 25 c -0 c v ka = v ref t emperature range: 0 c to 105 c v ka - cathode voltage (v) i k - cathode current (a) -0.5 0.25 0.5 0.75 1.0 1.25 1.5 1.24 figure 7. noise voltage vs frequency figure 8. low frequency dynamic ouput impedance vs t a 20 10 10 100 1 k 10 k 100 k 0 70 30 40 50 60 -60 -30 0 3 0609 0 120 0.0 0.025 0.050 0.075 0.100 0.125 0.150 noise voltage nv/ hz f - frequency (hz) z ka dynamic impedance (?) t a - free air temperature i k = 10ma t a = 25 c i ka = 160 a to 15ma f 1khz ? typical performance characteristics
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 4 figure 9. frequency=100khz, i k =10ma, t a =25 c figure 10. test circuit for pulse response gnd v out 50? f p = 100khz 180? v in i k this device is designed for stable opera- tion and has no need of an external capacitor. the reference remains stable if a bypass capacitor is used. sot-23 the spx4041 in the sot-23 package has a parasitic schottky diode between pin 3 and pin 1. pin 1 of sot-23 must float or be connected to pin 3. conventional shunt regulator in a conventional shunt regulator applica- tion (see figure 11), an external series resister (r s ) is connected between the supply voltage and the spx4041. r s determines the current that flows through the load (i l ) and the reference (i q ). since load current and supply voltage may vary, r s should be small enough to supply at least the minimum acceptable i q to the reference even when the supply voltage is at its minimum and the load current is at its maximum value. when the supply voltage is at its maximum and i l is at its minimum, r s should be large enough so that the current flowing through the spx4041 is less than 15ma. r s is determined by the supply voltage (v s ), the load and operating current (i l and i q ), reference? reverse breakdown voltage (v r ). r s = (v s - v r )/(i l +i q ) figure 11. spx4041 fixed shunt regulator figure 12 1.24v reference circuit v s i q + i l spx4041 v out i l i q v r r s 3k v in spx4041 v out typical performance characteristics application information
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 5 t op view bottom view t o-92 (n) 1 3 2 n/c t op view 2 1 3 4 8 7 6 5 8-pin soic (s) n/c n/c n/c + n/c n/c - 1 2 3 + - + - sot-23-3 (m) figure 13. low battery detector figure 14. micropower 10v reference lo = battery low spx4041 150 pf 500 k 500 k 86.7 k 12v + - spx4041 1 m + - v in = 12v to 20v lm4250 3 7 2 4 8 22 m 3.5 m 500 k 150 pf 6 package pinouts
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 6 package: 8 pin nsoic a a1 a2 side view seating plane section b-b with plating symbol min nom max a 1.35 - 1.75 a1 0.1 - 0.25 a2 1.25 - 1.65 b 0.31 - 0.51 c 0.17 - 0.24 d e e1 e l 0.4 - 1.27 l1 l2 ?0o-8o ?1 5o - 15o note: dimensions in (mm) 8 pin nsoic jedec mo-012 (aa) variation 4.90 bsc 6.00 bsc 3.90 bsc 1.27 bsc 1.04 ref 0.25 bsc gauge plane l1 l 1 seating plane l2 view c to p view b see view c b b e e/2 e1 index area (d/2 x e1/2) e1/2 d 1 e c base metal b
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 7 package: 3 pin sot-23 a a2 a1 side view a a seating plane c c with plating base metal b e e1 e e1 d b 1 2 3 l1 l gauge plane view c see view c b b section b-b view a-a seating plane symbol min nom max a0.89- 1.12 a1 0.01 - 0.1 a2 0.88 0.95 1.02 b0.3 -0.5 c0.08-0.2 d2.82. 93.04 e e1 e0.95- 2.64 e1 1.2 1.3 1.4 l0.40. 50.6 l1 ?0o-8o note: dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.95 bsc 1.90 bsc 0.54 ref
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 8 package: 3 pin to-92 d w l e1 e b a s1 a (2x) e r symbol min nom max a 0.17 - 0.195 b 0.014 - 0.02 e 0.13 - 0.155 e 0.95 - 0.105 e1 0.045 - 0.055 l 0.5 - 0.61 r 0.085 - 0.095 s1 0.045 - 0.06 w 0.016 - 0.022 d 0.175 - 0.195 a4o-6o note: dimensions in (inches) 3 pin to-92
date: 11/29/04 spx4041 precision 1.24v shunt voltage reference ?copyright 2004 sipex corporation 9 analog excellence sipex corporation headquarters and sales office: 233 hillview dr milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 part number accuracy output voltage package type spx4041am 1.0% 1.24v 3-pin sot-23 spx4041am/tr 1.0% 1.24v 3-pin sot-23 spx4041as 1.0% 1.24v 8-pin nsoic spx4041as/tr 1.0% 1.24v 8-pin nsoic spx4041an 1.0% 1.24v 3-pin to-92 spx4041an/tr 1.0% 1.24v 3-pin to-92 spx4041m 2.0% 1.24v 3-pin sot-23 spx4041m/tr 2.0% 1.24v 3-pin sot-23 spx4041s 2.0% 1.24v 8-pin nsoic spx4041s/tr 2.0% 1.24v 8-pin nsoic spx4041n 2.0% 1.24v 3-pin to-92 spx4041n/tr 2.0% 1.24v 3-pin to-92 ordering information available in lead free packaging. to order add "-l" suffix to part number. example: spx4041s/tr = standard; spx4041s-l/tr = lead free /tr = tape and reel pack quantity is 2,000 for to-92, 2,500 for nsoic and sot-23. click here to order samples
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