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preliminary data this is preliminary information on a new product now in deve lopment or undergoing evaluation. details are subject to change without notice. february 2010 doc id 17122 rev 1 1/13 13 stac2942f rf power transistors hf/vhf/uhf n-channel mosfets features gold metallization excellent thermal stability common source push-pull configuration pout = 350 w min. with 21 db gain @ 175 mhz in compliance with the 2002/95/ec european directive description the stac2942f is a gold metallized n-channel mos field-effect rf power transistor. it is intended for use in 50 v dc large signal applications up to 250 mhz. figure 1. pin connection stac244f air cavity 1. drain 2. gate 3. source (bottom side) 1 1 2 2 3 table 1. device summary order code marking package packaging stac2942f stac2942f stac244f plastic tray www.st.com
contents stac2942f 2/13 doc id 17122 rev 1 contents 1 electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 static . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
stac2942f electrical data doc id 17122 rev 1 3/13 1 electrical data 1.1 maximum ratings 1.2 thermal data table 2. absolute maximum ratings (t case = 25 c) symbol parameter value unit v (br)dss (1) 1. t j = 150 c drain source voltage 130 v v dgr (1) drain-gate voltage (r gs = 1 m )130v v gs gate-source voltage 20 v i d drain current 40 a p diss power dissipation 625 w t j max. operating junction temperature 200 c t stg storage temperature -65 to +150 c table 3. thermal data symbol parameter value unit r thjc junction - case thermal resistance 0.28 c/w
electrical characteristics stac2942f 4/13 doc id 17122 rev 1 2 electrical characteristics (t case = 25 o c) 2.1 static 2.2 dynamic table 4. static (per side) symbol test conditions min. typ. max. unit v (br)dss (1) 1. t j = 150 c v gs = 0 v i ds = 100 ma 130 v i dss v gs = 0 v v ds = 50 v 100 a i gss v gs = 20 v v ds = 0 v 250 na v gs(q) v ds = 10 v i d = 250 ma 1.5 2.5 4.0 v v ds(on) v gs = 10 v i d = 10 a 3.0 v g fs v ds = 10 v i d = 5 a 5 s c iss v gs = 0 v v ds = 50 v f = 1 mhz 425 pf c oss 202 pf c rss 12 pf table 5. dynamic symbol test conditions min. typ. max. unit p out v dd = 50 v, i dq = 2 x 250 ma, p in = 4 w, f = 175 mhz 350 450 w h d v dd = 50 v, i dq = 2 x 250 ma, p in = 4 w, f = 175 mhz 60 75 %
stac2942f impedance doc id 17122 rev 1 5/13 3 impedance figure 2. current conventions note: measured gate to gate and drain to drain, respectively. table 6. impedance data freq. (mhz) z in ( )z dl ( ) 175 mhz 2.0 - j2.0 3.5 + j5.2
typical performance stac2942f 6/13 doc id 17122 rev 1 4 typical performance figure 3. capacitances vs drain supply voltage figure 4. output power vs drain supply voltage figure 5. output power vs gate voltage figure 6. output power vs input power 0 100 200 3 00 400 500 600 700 8 00 900 1000 01020 3 0405060 c a p a cit a nce s (pf) su pply volt a ge (v) ci ss cr ss co ss a m 00556 am00556v1 freq. = 1 mhz 2xwsxwsrzhu: 6xsso\yrowdjh9 3lq : 3lq : 3lq : $0y )uht 0+],gt [p$ /utputpower7 'atevoltage6 4case?# 4case?# 4case ?# &req-(z 0in 7 6dd 6 )dq xm! !-v /utputpower7 6dd6 6dd6 &req -(z )dqxm! 4case # !-v
stac2942f typical performance doc id 17122 rev 1 7/13 figure 7. output power vs input power and case temperature figure 8. efficiency vs output power and case temperature figure 9. power gain vs output power and case temperature /utputpower7 )nput0ower7 4case?# 4case?# 4case ?# &req-(z 6dd 6 )dq xm! !-v %fficiency /utput0ower7 4case?# 4case?# 4case ?# &req-(z 6dd6 )dqxm! !-v 0owergaind" /utput0ower7 4case?# 4case?# 4case ?# !-v &req-(z 6dd 6 )dqxm!
test circuit stac2942f 8/13 doc id 17122 rev 1 5 test circuit figure 10. 175 mhz test circuit schematic (production test circuit) &25( )% )% *$3%(7:((1*5281' 75$160,66,21/,1(6,6>@ 7<�3 ',0(16,216$7&20321(176<�0%2/6$5(5()(5(1&()25&20321(17 3/$&(0(176((6+((7 )% 127(6 & % & &25( & 5 & 5 )% 5 & &25( & 7 7 &25( )% & )% 5 5 & & 5 '87 & & & & & & 7 & 7 9jj 75$160,66,21/,1(',0(16,216 & % $ % $ $ & & % $ % $$ & & $ 63$&( $ & & & & & % /, )% 9 00 ,1 ',0 & % $ ',0(16,217$%/( & 9jj !-v table 7. 175 mhz test circuit component part list component description c1, c2, c14, c15, c24, c25 1200 pf atc 700b chip capacitor c5 75 pf atc 100b chip capacitor c6 st406 variable capacitor c9, c10 47 pf atc 100b chip capacitor c11, c12, c13 43 pf atc 100b chip capacitor c16, c18 470 pf atc 100b chip capacitor c17, c19, c20, c21 10,000 pf atc 200b chip capacitor c22, c23 .1 f 200 v chip capacitor c28 10 f 100 v electrolytic capacitor c29 .8 - 8 pf variable capacitor r1, r2, r5, r6 430 , 1/2 w chip resistor
stac2942f test circuit doc id 17122 rev 1 9/13 component description r3, r4 270 1/2 w axial lead resistor b1 rg-316 50 11.8" thru ferrite toroid b2 rg-142 50 11.8" t1 4:1, rg-316 25 , 5.9", 2 turns thru ferrite core t2 1:4, 25 semi-rigid cable, od .141", 5.9" l1 /4 inductor, rg-142 50 , 11.8", 3 turns thru ferrite toroid fb1,fb5 ferrite toroid fb2, fb6 multi-aperture core fb3, fb4 surface mount ferrite bead pcb rogers ultralam 2000, er 2.55, .060" table 7. 175 mhz test circuit component part list (continued) figure 11. circuit layout
package mechanical data stac2942f 10/13 doc id 17122 rev 1 6 package mechanical data in order to meet environmental re q uirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. table 8. stac244f package dimensions dim. mm. inch min max min max a 5.10 5.59 200 220 a1 4.32 4.83 170 190 b 4.32 5.33 170 210 c 9.65 9.91 380 390 d 19.61 20.02 772 788 e 20.45 20.70 805 815 f 0.081.15.003.006 g 0.891.14.035.045 h 1.451.70.057.067 i 3.184.32.125.170 j 9.279.53.365.375
stac2942f package mechanical data doc id 17122 rev 1 11/13 figure 12. package dimensions !-v
revision history stac2942f 12/13 doc id 17122 rev 1 7 revision history table 9. document revision history date revision changes 12-feb-2010 1 first release
stac2942f doc id 17122 rev 1 13/13 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2010 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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