Data Sheet No. 2C4957 Generic Packaged Parts: Chip Type 2C4957 Geometry 0006 Polarity PNP 2N4957, 2N4958, 2N4959 Chip type 2C4957 by Semicoa Semiconductors provides performance similar to these devices. Part Numbers: 2N4957, 2N4957UB, 2N4958, 2N4958UB, 2N4959, 2N4959UB, SD4957, SD4957F, SQ4957, SQ4957F Product Summary: APPLICATIONS: Designed for high-gain, low-noise class A amplifiers, oscillators and mixers. Features: Special Characteristics ft = 1.6 GHz (typ) at 2.0 mA/10V Radiation graphs available Mechanical Specifications Top Backside Emitter Base Metallization Bonding Pad Size Die Thickness Chip Area Top Surface Al - 12 kÅ min. Au - 6.5 kÅ nom. 2.3 mils x 2.3 mils 2.3 mils x 2.3 mils 8 mils nominal 16 mils x 16 mils Silox Passivated Electrical Characteristics TA = 25oC Parameter Test conditions Min Max Unit BVCEO IC = 1.0 mA 30 --- V dc BVCBO IC = 100 µA 30 --- V dc BVEBO IE = 100 µA 3.0 --- V dc VCB = 10 V dc --- 0.1 µA ICBO hFE VCE = 10 V, IC = 2.0 mA 20 150 --Due to limitations of probe testing, only dc parameters are tested. This must be done with pulse width less than 300 µs, duty cycle less than 2%.