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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. october 2010 doc id 15509 rev 5 1/11 11 LET9120 rf power transistor from the ldmost family of n-channel enhancemen t-mode lateral mosfets features excellent thermal stability common source configuration push-pull p out = 120 w with 18 db gain @ 860 mhz beo-free package description the LET9120 is a common source n-channel enhancement-mode lateral field-effect rf power transistor designed for broadband commercial and industrial applications at frequencies up to 1.6 ghz. figure 1. pin connection m246 epoxy sealed 1-2 drain 4-5 gate 3 source 12 4 5 table 1. device summary order code package branding LET9120 m246 LET9120 www.st.com
contents LET9120 2/11 doc id 15509 rev 5 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 typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LET9120 electrical data doc id 15509 rev 5 3/11 1 electrical data 1.1 maximum ratings t case = 25 c 1.2 thermal data table 2. absolute maximum ratings symbol parameter value unit v (br)dss drain-source voltage 80 v v gs gate-source voltage - 0.5 / + 15 v i d drain current 18 a p diss power dissipation (@ t c = 70 c) 200 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 0.65 c/w
electrical characteristics LET9120 4/11 doc id 15509 rev 5 2 electrical characteristics t case = + 25 c 2.1 static 2.2 dynamic table 4. static (per section) symbol test conditions min. typ. max. unit v (br)dss v gs = 0 v i ds = 10 ma 80 v i dss v gs = 0 v v ds = 28 v 1 a i gss v gs = 5 v v ds = 0 v 1 a v gs(q) v ds = 28 v i d = 100 ma 2.0 5.0 v v ds(on) v gs = 10 v i d = 3 a 0.9 1.2 v g fs v ds = 10 v i d = 3 a 2.5 mho c iss v gs = 0 v v ds = 28 v f = 1 mhz 58 pf c oss v gs = 0 v v ds = 28 v f = 1 mhz 30 pf c rss v gs = 0 v v ds = 28 v f = 1 mhz 0.7 pf table 5. dynamic symbol test conditions min. typ. max. unit p out v dd = 32 v i dq = 400 ma p in = 2.5 w 120 150 - w g ps v dd = 32 v i dq = 400 ma p out = 150 w 16 18 db d v dd = 32 v i dq = 400 ma p out = 150 w 60 70 % load mismatch v dd = 32 v i dq = 400 ma p out = 160 w @ 860 mhz all phase angles 20:1 vswr table 6. impedance data frequency mhz z source (as measured in the circuit gate to gate) z load (as measured in the circuit drain to drain) 860 1.5 + j 2.2 6.2 + j 5.2
LET9120 typical performance doc id 15509 rev 5 5/11 3 typical performance figure 2. gain & efficiency vs. output powe r figure 3. gain vs. output power & bias current figure 4. output power & efficiency vs. input power figure 5. output power vs. drain supply voltage 16 17 18 19 20 21 22 23 24 0 20406080100120140160 output power (w) gain (db) 0 10 20 30 40 50 60 70 80 efficiency (%) gain efficiency vdd = 28 v idq = 400 ma freq = 400 mhz 16 17 18 19 20 21 22 23 24 0 20406080100120140160 output power (w) gain (db) 0 10 20 30 40 50 60 70 80 efficiency (%) gain efficiency vdd = 28 v idq = 400 ma freq = 400 mhz 12 14 16 18 20 22 24 26 0 40 80 120 160 200 output power (w) gain (db) idq = 100 ma idq = 400 ma idq = 800 ma vdd = 32 v freq = 860 mhz 12 14 16 18 20 22 24 26 0 40 80 120 160 200 output power (w) gain (db) idq = 100 ma idq = 400 ma idq = 800 ma vdd = 32 v freq = 860 mhz 0 20 40 60 80 100 120 140 160 180 200 0 0.8 1.6 2.4 3.2 4 4.8 input power (w) output power (w) 0 20 40 60 80 100 efficiency (%) pout efficiency vdd = 32 v idq = 400 ma freq = 860 mhz 0 20 40 60 80 100 120 140 160 180 200 0 0.8 1.6 2.4 3.2 4 4.8 input power (w) output power (w) 0 20 40 60 80 100 efficiency (%) pout efficiency vdd = 32 v idq = 400 ma freq = 860 mhz 0 20 40 60 80 100 120 140 160 180 200 22 24 26 28 30 32 34 supply voltage (v) output power (w) pin = 1.5 w pin = 2.5 w pin = 3.5 w vdd = 32 v idq = 400 ma freq = 860 mhz 0 20 40 60 80 100 120 140 160 180 200 22 24 26 28 30 32 34 supply voltage (v) output power (w) pin = 1.5 w pin = 2.5 w pin = 3.5 w vdd = 32 v idq = 400 ma freq = 860 mhz
test circuit LET9120 6/11 doc id 15509 rev 5 4 test circuit figure 6. test circuit schematic - 860 mhz dut c15 c16 c17 c18 tl16 c19 c20 r4 r3 r2 r1 vdd tl4 c13 tl8 c4 c5 c2 tl9 tr1 d s g vdd tr2 d s g vdd tl15 tl14 c6 c10 c9 fb2 tl13 vdd fb1 c7 c8 ballun2 output tl12 tl11 tl10 ballun1 c3 c1 input c14 c12 c11 tl5 tl6 tl7 tl3 tl2 tl1 vgg vgg am07851v1 table 7. circuit component list item q.ty part number vender description r1, r3 2 cr1206-8w-130jb venkel 13 , 1/8 w surface mount chip resistor r2, r4 2 cr1206-8w-122jb venkel 1.2 k , 1/8 w surface mount chip resistor r5, r6 2 cr1206-8w-250jb venkel 25 , 1/8 w surface mount chip resistor b1, b2 2 2743021447 fair-rite corp surface mount emi shield bead c1, c3, c7, c9 4 100 f, 63 v electrolytic capacitor c2, c4, c5, c6 4 atc100b910xxxx atc 91 pf chip capacitor c8, c10 2 c1812x7r501-104kne venkel 0.1 f 500 v surface mount ceramic chip capacitor c11, c12 2 atc100b620xxxx at c 62 pf chip capacitor c13, c14 2 atc100b151xxxx atc 150 pf chip capacitor c15 1 atc100b110xxxx atc 11 pf chip capacitor c16 1 atc100b7r5xxxx atc 7.5 pf chip capacitor c17 1 atc100b1r1xxxx atc 1.1 pf chip capacitor c18 1 27291pc johanson 0.8 - 8 pf giga trim variable capacitor
LET9120 test circuit doc id 15509 rev 5 7/11 item q.ty part number vender description c19, c20 2 atc100b101xxxx atc 100 pf chip capacitor tl1, tl5 l= 0.250in [6.35mm] w=0.214in [5.44mm] tl2, tl6 l= 0.182in [4.62mm] w=0.284in [7.21mm] tl3, tl7 l= 0.318in [8.08mm] w=0.284in [7.21mm] tl4, tl8, tl9, tl13 l= 2.37in [60.19mm] w=0.082in [2.08mm] tl10, tl14 l= 0.314in [7.97mm] w=0.230in [5.84mm] tl11, tl15 l= 0.460in [11.68mm] w=0.230in [5.84mm] tl12, tl16 l= 0.280in [7.11mm] w=0.230in [5.84mm] board 3x5 1 rogers corp er=2.55 t=0.0026in h=0.030in table 7. circuit component list (continued)
package mechanical data LET9120 8/11 doc id 15509 rev 5 5 package mechanical data in order to meet environmental requirements, 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.
LET9120 package mechanical data doc id 15509 rev 5 9/11 figure 7. package dimensions table 8. m246 (0.230 x 0.650 wide 4/l bal n/herm w/flg) mechanical data dim. mm. inch. min. typ. max. min. typ. max. a 5.33 5.59 0.210 0.220 b 6.48 6.73 0.255 0.265 c 17.27 18.29 0.680 0.720 d 5.72 5.97 0.225 0.235 e 22.86 .900 f 28.83 29.08 1.135 1.145 g 16.26 16.76 0.640 0.660 h 4.19 5.08 0.165 0.200 i 0.08 0.15 0.003 0.006 j 1.83 2.24 0.072 0.088 k 1.40 1.65 0.055 0.065 l 3.18 3.43 0.125 0.135 controlling dimension: inches ref. 7145054a
revision history LET9120 10/11 doc id 15509 rev 5 6 revision history table 9. document revision history date revision changes 10-mar-2009 1 first issue. 22-jul-2009 2 updated document?s title. 18-nov-2009 3 updated v gs in ta b l e 2 . 11-feb-2010 4 changed test condition for v (br)dss in table 4: static (per section) . 22-oct-2010 5 added: typical performance on page 5 and test circuit on page 6 .
LET9120 doc id 15509 rev 5 11/11 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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