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A cryogenic wideband 4-8 GHz hybrid low-noise amplifier, based on a 110 nm gate length InAs/AlSb HEMT process is presented. At room temperature the three-stage amplifier exhibited a transducer gain of 29 dB and a noise temperature of 150 K with 17.6 mW power consumption. When cooled to 13 K, the amplifier showed a minimum noise temperature of 19 K at a power consumption of 6 mW (66% reduction compared to room temperature). At cryogenic temperature, the optimum drain voltage for best noise performance was reduced from 0.55 V down to 0.3 V, demonstrating the very low-power and low-voltage capabilities of InAs/AlSb HEMT based low-noise amplifiers at cryogenic temperature.