SD1894 RF & MICROWAVE TRANSISTORS SATELLITE COMMUNICATIONS APPLICATIONS .. .. .. CLASS C 1.6 GHz COMMON BASE REFRACTORY/GOLD METALLIZATION EFFICIENCY = 50% MIN. POUT = 4.5 W MIN. WITH 10 dB GAIN .250 x .320 2LFL (M170) epoxy sealed BRANDING SD1894 ORDER CODE SD1894 PIN CONNECTION DESCRIPTION The SD1894 is a common base silicon NPN bipolar device optimized for 1.6 GHz SATCOM applications. The SD1894 offers superior gain and collector efficiency, making it an ideal choice for Class C power amplifiers used in portable as well as fixed SATCOM terminals. 1. Collector 3. Base 2. Emitter ABSOLUTE MAXIMUM RATINGS (T case = 25°C) Symbol Parameter Valu e Unit VCBO Collector-Base Voltage 45 V VCES Collector-Emitter Voltage 45 V VEBO Emitter-Base Voltage 3.0 V Device Current 375 mA Power Dissipation 12.5 W TJ Junction Temperature +200 °C TSTG Storage Temperature − 65 to +150 °C 14.0 °C/W IC PDISS THERMAL DATA RTH(j-c) February 4, 1997 Junction-Case Thermal Resistance 1/4 SD1894 ELECTRICAL SPECIFICATIONS (T case = 25°C) STATIC Symbol Value Test Conditions Unit Min. Typ. Max. BVCBO IC = 1 mA IE = 0 mA 45 — — V BVCES IC = 1 mA VBE = 0 V 45 — — V BVEBO IE = 1 mA IC = 0 mA 3.0 — — V ICBO VCB = 28 V IE = 0 mA — — .25 mA hFE VCE = 5 V IC = .2 A 15 — 150 — DYNAMIC Symbol Value Test Conditions Typ. Max. PIN ηc f = 1650 MHz VCC = 28 V POUT = 4.5 W — .35 .45 W f = 1650 MHz VCC = 28 V POUT = 4.5 W 50 55 — % PG f = 1650 MHz VCC = 28 V POUT = 4.5 W 10.0 11.1 — dB POUT = 4.5 W VSWR = 20:1 Load VCC = 28 V Mismatch INPUT POWER vs OUTPUT POWER 2/4 Unit Min. No Degradation in Output Power SD1894 IMPEDANCE DATA TYPICAL INPUT IMPEDANCE ZIN TYPICAL COLLECTOR LOAD IMPEDANCE ZCL FREQ. ZIN (Ω) ZCL (Ω) 1600 MHz 31.6 + j 21.4 5.2 + j 14.7 1620 MHz 38.0 + j 15.0 5.6 + j 14.55 1635 MHz 38.8 + j 11.3 5.85 + j 14.45 1650 MHz 36.0 + j 9.1 6.1 + j 14.3 1665 MHz 34.3 + j 8.77 6.37 + j 14.2 TEST CIRCUIT C1 : .6 - 4.5 pf Johanson C2 : 39pf ATC Chip Capacitor C3 : .1 µf Ceramic L1 : 10 Turns, AWG #28, .080”I.D. L2 : 4 Turns, AWG #28, .)80” I.D. Board Material: Er = 10.2, Thickness .050” 3/4 SD1894 PACKAGE MECHANICAL DATA Ref.: Dwg. No.12-0170 UDCS No. 1010996 rev B Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifi cations mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorize d for use as criti cal components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. 1997 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland Taiwan - Thailand - United Kingdom - U.S.A. 4/4