THAT3xx

FEATURES 4 Matched NPN Transistors º 300 typical hfe of 100 º 300A minimum hfe of 150 º 300B minimum hfe of 300 4 Matched PNP Transistors º 320 typical hfe of 75 2 Matched PNP and 2 Matched NPN Transistors º 340 PNP typical hfe of 75 º 340 NPN typical hfe of 100 Low Voltage Noise º 0.75 nV/ √Hz (PNP) º 0.8 nV/ √Hz (NPN) High Speed º fT = 350 MHz (NPN) º fT = 325 MHz (PNP) 500 μV matching between devices Dielectrically Isolated for low crosstalk and high DC isolation 36V VCEO Low-Noise Matched Transistor Array ICs THAT 300 Series APPLICATIONS Low Noise Front Ends Microphone Preamplifiers Log/Antilog Amplifiers Current Sources Current Mirrors Multipliers Description The THAT 300, 320 and 340 are large geometry, 4-transistor, monolithic NPN and/or PNP arrays. They exhibit both high speed and low noise, with excellent parameter matching between transistors of the same gender. Typical base-spreading resistance is 25 Ω for the PNP devices (30 Ω for the low-gain NPNs), so their resulting voltage noise is under 1 nV/√Hz. This makes the 300 series ideally suited for low-noise amplifier input stages, log amplifiers, and many other applications. The four-NPN transistor array is available in versions selected for hfe with minimums of 150 (300A) or 300 (300B). Fabricated in a dielectrically isolated, complementary bipolar process, each transistor is electrically insulated from the others by a layer of insulating oxide (not the reverse-biased PN junctions us...