This work presents a novel monolithic atomic layer thermopile (ALTP)-based sensor array with higher spatial resolution than previous single-sensor modules combined with almost zero surface roughness. The manufacturing process, measurement chain, and sensor calibration are described, and the working principle is demonstrated by a first 5 × 1 linear array prototype. To test the sensor array, stagnation point heat flux measurements in a turbulent hot impingement jet with a Reynolds number of 14 000 are conducted. The mean wall heat flux density exhibits a decrease of 22% at 0.5 r/D compared to the centre axis. A turbulence intensity analysis reveals an increase from 23.5% in the stagnation point to 26.5% at 0.5 r/D. Based on the power spectral density estimate, a turbulent jet spectrum can be observed and two major slopes (close to f^−5/3 and f^−17/3) can be identified similar to a typical turbulent kinetic energy spectrum. Normalised peak cross-correlation coefficients provide a measure of the similarity between the heat transfer signals detected by the sensors in the array. They are in the range of 0.31–0.71 with the highest values among immediate neighbours. Analysis of corresponding peak-lags reveals time delays that increase progressively between 0.21 ms and 0.46 ms. This suggests that dominant heat-transfer structures lose spatial coherence rapidly and require longer propagation times as they transition away from the stagnation region in the radial direction.