BF494 tm NPN RF Transistor TO-92 Absolute Maximum Ratings * Symbol 1. Collector 2. Emitter 3. Base Ta = 25°C unless otherwise noted Value Unit VCEO Collector-Emitter Voltage Parameter 20 V VCBO Collector-Base Voltage 30 V VEBO Emitter-Base Voltage 5.0 V IC Collector Current - Continuous 30 mA TJ Junction Temperature 150 °C TSTG Storage Temperature Range - 55 ~ 150 °C * These ratings are limiting values above which the serviceability of any semiconductor device may be impaired. NOTES: 1) These ratings are based on a maximum junction temperature of 150 degrees C. 2) These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle operations Thermal Characteristics Symbol Parameter Value Unit PD Total Device Dissipation, by RθJA Derate above 25°C 350 2.8 mW mW/°C RθJC Thermal Resistance, Junction to case 125 °C/W RθJA Thermal Resistance, Junction to Ambient 357 °C/W Electrical Characteristics* Symbol TC = 25°C unless otherwise noted Parameter Conditions Min. Max. Units V(BR)CEO Collector-Emitter Breakdown Voltage IC = 1.0mA, IB = 0 20 V V(BR)CBO Collector-Base BreakdownVoltage V(BR)EBO Emitter-Base Breakdown Voltage IC = 10µA, IE = 0 30 V IE = 10µA, IC = 0 5.0 V ICES Collector-Emitter Sustaining Current VCE = 40V, VEB = 0V hFE DC Current Gain VCE = 10V, IC = 1mA VCE(sat) Collector-Emitter Saturation Voltage IC = 10mA, IB = 5mA 0.2 V VBE(sat) Base-Emitter Saturation Voltage IC = 10mA, IB = 5mA 0.92 V VBE(ON) Base-Emitter On Voltage VCE = 10V, IC = 10mA 740 mV 10 67 650 nA 222 * DC Item are tested by Pulse Test: Pulse Width≤300us, Duty Cycle≤2% ©2006 Fairchild Semiconductor Corporation BF494 Rev. A 1 www.fairchildsemi.com BF494 NPN RF Transistor July 2006 BF494 NPN RF Transistor Package Dimensions TO-92 +0.25 4.58 ±0.20 4.58 –0.15 ±0.10 14.47 ±0.40 0.46 1.27TYP [1.27 ±0.20] (0.25) +0.10 0.38 –0.05 0.38 –0.05 ±0.20 3.86MAX 3.60 1.02 ±0.10 +0.10 1.27TYP [1.27 ±0.20] (R2.29) Dimensions in Millimeters 2 BF494 Rev. A www.fairchildsemi.com The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ DOME™ EcoSPARK™ E2CMOS™ EnSigna™ FACT™ FAST® FASTr™ FPS™ FRFET™ FACT Quiet Series™ GlobalOptoisolator™ GTO™ HiSeC™ I2C™ i-Lo™ ImpliedDisconnect™ IntelliMAX™ ISOPLANAR™ LittleFET™ MICROCOUPLER™ MicroFET™ MicroPak™ MICROWIRE™ MSX™ MSXPro™ Across the board. Around the world.™ The Power Franchise® Programmable Active Droop™ OCX™ OCXPro™ OPTOLOGIC® OPTOPLANAR™ PACMAN™ POP™ Power247™ PowerEdge™ PowerSaver™ PowerTrench® QFET® QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ RapidConnect™ µSerDes™ ScalarPump™ SILENT SWITCHER® SMART START™ SPM™ Stealth™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ TCM™ TinyBoost™ TinyBuck™ TinyPWM™ TinyPower™ TinyLogic® TINYOPTO™ TruTranslation™ UHC™ UltraFET® UniFET™ VCX™ Wire™ DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I20 3 BF494 Rev. A www.fairchildsemi.com BF494 NPN RF Transistor TRADEMARKS