The Si PIN Detector PA200 represents a significant advancement in solid-state radiation detection technology, purpose-built for high-resolution X-ray fluorescence spectroscopy. Manufactured by Nuchip Photoelectric Technology Shan Dong Co., Ltd., this detector leverages the company's integrated device manufacturing (IDM) capabilities to deliver exceptional performance in a compact, reliable package. Unlike detectors that rely on outsourced fabrication and assembly, the PA200 benefits from complete in-house control over every step of the production process, from epitaxial wafer growth to final packaging and testing. This vertical integration allows Nuchip to optimize the silicon pin photodiode structure for minimal leakage current and maximum charge collection efficiency, two parameters that directly determine the energy resolution and sensitivity of the detector. The PA200 is specifically designed for XRF spectrometers used in material analysis, alloy identification, and environmental screening, where accurate detection of elements from sodium through uranium is required. By combining a thick 500 µm active region with a high-quality SiO₂ passivation layer, the detector achieves excellent signal-to-noise ratios even at short shaping times. The result is a robust, high-yield detector that competes directly with imported alternatives while offering the advantages of domestic supply chain stability and responsive technical support. For laboratories and OEM integrators seeking a reliable silicon pin photodiode solution, the PA200 delivers consistent performance across a wide range of operating conditions.

The Si PIN Detector PA200 incorporates several design innovations that translate directly into measurable advantages for end users. One of the most critical parameters for any XRF spectrometer is energy resolution, and the PA200 achieves a full width at half maximum (FWHM) of 139 eV to 190 eV at the Mn Kα line (5.9 keV), depending on the chosen peaking time and cooling configuration. This level of resolution is made possible by the exceptionally low leakage current of the silicon pin photodiode, which is typically below 1 nA at room temperature with the built-in single-stage thermoelectric cooler active. The thermoelectric cooler (TEC) integrated into the detector package maintains the photodiode at a stable low temperature, reducing thermal noise and allowing the preamplifier to operate at optimal gain. Another key benefit is the high charge collection efficiency, which approaches 100% for photons in the 1.5–30 keV energy range, ensuring that virtually every incident X-ray photon is converted into a measurable electrical pulse. The detector also features a low capacitance design that minimizes electronic noise contributions from the front-end electronics, further improving the achievable peak-to-background ratio. Users will appreciate the rugged ceramic substrate and hermetic packaging, which protect the silicon pin photodiode from humidity, dust, and mechanical shock, making the PA200 suitable for both laboratory benchtop instruments and portable handheld analyzers. Additionally, the detector is designed for easy integration with standard analog shaping amplifiers and digital pulse processors, reducing development time for OEM customers. The combination of low noise, high efficiency, and robust packaging makes the PA200 a versatile building block for any application requiring precise X-ray detection.

The integrated device manufacturing model adopted by Nuchip Photoelectric Technology is the cornerstone of the Si PIN Detector PA200's performance and reliability. Unlike many detector suppliers who purchase raw wafers or finished photodiodes from third-party foundries and then assemble them into modules, Nuchip controls the entire value chain starting from silicon ingot growth through wafer processing, junction formation, passivation, metallization, dicing, packaging, and comprehensive testing. This end-to-end control allows the engineering team to fine-tune each process step specifically for the silicon pin photodiode application, such as optimizing the doping profile to minimize the depletion region leakage current and adjusting the surface passivation chemistry to reduce generation-recombination centers. Because every detector is fabricated in the same facility where it was designed, feedback loops between design, process, and test are extremely short, enabling rapid iterative improvements that would be impossible with an external foundry model. The IDM approach also ensures strict traceability: each PA200 detector can be traced back to the specific wafer lot, process batch, and test record, which is essential for quality management systems in medical, aerospace, and industrial applications. Furthermore, in-house fabrication gives Nuchip the ability to offer customized variants of the silicon pin photodiode, such as modified active areas, different thickness options, or specialized window coatings, without the long lead times and minimum order quantities imposed by external suppliers. For customers who visit the Nuchip facility, the cleanroom manufacturing line and probe testing stations provide visible evidence of the company's commitment to quality. The IDM model ultimately translates into higher yield, lower cost, and better performance consistency across production lots, directly benefiting end users who rely on the PA200 for mission-critical measurements. To learn more about the company's vertically integrated approach, theABOUT US page provides a detailed overview of Nuchip's wafer fabrication capabilities and leadership team.

The Si PIN Detector PA200 is characterized by a well-defined set of electrical and detection parameters that enable system designers to predict its behavior in various XRF configurations. The active area of the detector is 7 mm² with a thickness of 500 µm, providing high stopping power for X-rays up to 30 keV while maintaining low capacitance of approximately 10 pF at full depletion. The depletion voltage is typically 70 V, and the detector can be operated at biases up to 100 V without risking breakdown, offering flexibility in optimizing the electric field profile. Energy resolution is specified at 139–190 eV FWHM at 5.9 keV with a peaking time of 6 µs and the TEC activated, which is competitive with many cooled silicon drift detectors and superior to most standard PIN photodiodes in the same price range. The input count rate capability extends to over 100 kcps with a shaping time of 0.5 µs, making the PA200 suitable for applications where high throughput is required, such as conveyor belt material sorting or real-time process control. Noise performance is quantified by an equivalent noise charge (ENC) of approximately 15–20 electrons rms at optimal shaping, which translates directly into the low-energy threshold of around 1.5 keV, enabling detection of light elements like sodium, magnesium, and aluminum. The detector operates over a wide temperature range, from -10 °C to +50 °C, with the TEC maintaining the photodiode die at a stable temperature below ambient. The package footprint is compact, with a TO-8 or similar hermetic housing that includes a thin beryllium or polymer window for X-ray transmission. All specifications are guaranteed over the full temperature range and are verified with 100 % testing before shipment, ensuring that every delivered unit meets the stated performance levels.

The PA200 is qualified according to industrial reliability standards, including temperature cycling, humidity exposure, and mechanical vibration tests that simulate the conditions encountered in portable and field-deployed XRF instruments. The maximum reverse bias voltage is 100 V, and the leakage current at 70 V and 25 °C is typically less than 2 nA. When cooled to -20 °C via the TEC, the leakage current drops to below 100 pA, which is essential for achieving the best possible energy resolution. The detector's capacitance remains stable across the operating bias range, simplifying the design of the front-end preamplifier. Customers are advised to operate the detector with a bias voltage of at least 60 V to ensure full depletion of the 500 µm thickness. The TEC requires a drive current of up to 2 A at 3 V, and the system should include a dedicated temperature controller to regulate the photodiode temperature within ±0.5 °C of the setpoint. Detailed application notes are provided with every evaluation kit, and Nuchip's technical team is available to assist with integration questions through theCONTACT US page.

The Si PIN Detector PA200 is available in multiple configurations to suit different stages of product development and volume production. For research laboratories and prototype developers, Nuchip offers a standalone detector module that includes the hermetically packaged PIN photodiode with the TEC pre-attached, a flexible ribbon cable, and a detailed datasheet with typical performance curves. This configuration allows engineers to integrate the silicon pin photodiode into their own preamplifier and pulse processing chain, giving maximum design flexibility. For customers who prefer a more complete solution, Nuchip provides an integrated detector subassembly that combines the PA200 with a low-noise charge-sensitive preamplifier and a temperature controller board, all housed in a shielded aluminum enclosure with a standard DB-9 connector for power and signal output. This subassembly has been pre-tested and characterized, so it can be directly connected to the analog input of most commercial digital pulse processors, dramatically reducing system development time. In high-volume applications, Nuchip can supply the PA200 in tape-and-reel packaging for automated pick-and-place assembly, provided the customer has appropriate handling capabilities for hermetically sealed components. All configurations are backed by Nuchip's quality assurance program, which includes 100 % screening for leakage current, capacitance, and energy resolution at the factory. The company also supports custom mechanical adaptations, such as custom window materials, alternative pin layouts, or integrated collimators, to match specific instrument geometries. For a complete overview of the available variants, thePRODUCTS page lists all current radiation detector and photodiode offerings from Nuchip.

The performance data for the Si PIN Detector PA200 demonstrate its capability across a range of operating conditions commonly encountered in XRF spectroscopy. Energy resolution varies as a function of peaking time due to the interplay between shot noise from the leakage current and series noise from the detector capacitance and preamplifier input stage. At a peaking time of 6 µs, the resolution reaches its optimum value of 139 eV FWHM, which is suitable for separating closely spaced spectral lines such as Kα and Kβ peaks of transition metals. At shorter peaking times of 0.5–1 µs, the resolution degrades to approximately 190 eV FWHM, but the detector can handle input count rates exceeding 100 kcps without significant spectral distortion or pile-up losses. This makes the PA200 particularly useful in applications where high throughput is prioritized over ultimate resolution, such as in-line process monitoring or sorting systems. The detection efficiency for the 500 µm thick active region is effectively 100 % for X-ray energies from 1.5 keV up to about 15 keV, then gradually decreases to around 40 % at 25 keV and less than 10 % at 30 keV. The low-energy threshold is primarily determined by the noise floor and the window transmission, and with a standard 8 µm beryllium window, the PA200 can detect K-lines of fluorine (0.68 keV) and L-lines of heavier elements down to about 1.0 keV. All performance curves are provided in the official datasheet along with typical spectra for copper, iron, and stainless steel samples, allowing customers to validate the detector's behavior against their own requirements. The consistency of these parameters across multiple units is a direct result of the IDM manufacturing discipline and rigorous final testing.

The Si PIN Detector PA200 is deployed in a wide array of analytical instruments where precise elemental identification and quantification are required. In X-ray fluorescence spectroscopy, the detector is the central component that converts characteristic X-rays emitted by a sample into electrical signals, and the quality of this conversion directly determines the accuracy of the resulting element concentration data. One major application area is alloy identification and sorting in the scrap metal and manufacturing industries, where portable XRF analyzers equipped with the PA200 can determine the grade of stainless steel, aluminum alloys, nickel-based superalloys, and titanium alloys within seconds. The excellent resolution of the silicon pin photodiode allows operators to distinguish between adjacent elements such as chromium, manganese, and iron, which is essential for correct alloy classification. Another critical application is RoHS/WEEE compliance testing, where regulators and manufacturers must screen for restricted substances including lead (Pb), mercury (Hg), cadmium (Cd), and hexavalent chromium (Cr⁶⁺) in electronic components, plastics, and coatings. The PA200's low-energy threshold enables detection of lead L-lines at 10.5 keV and cadmium K-lines at 23.1 keV with high sensitivity, meeting the detection limits required by IEC 62321 standards. Environmental laboratories also rely on the PA200 for analyzing soil, water, and air filter samples for heavy metal contamination, where the detector's stability over long measurement intervals ensures reproducible results. In the art and archaeology fields, non-destructive XRF analysis using PA200-based instruments helps conservators identify pigments, metal compositions, and provenance markers without damaging valuable artifacts. The detector's robust design and consistent performance also make it suitable for integration into automated conveyor-belt analyzers used in mining and cement production. For more information on how Nuchip detectors enable these diverse applications, theAbout-1 page illustrates the company's technology deployment across aerospace, life science, and industrial sectors.

When evaluating XRF detectors, system designers typically compare PIN photodiodes, silicon drift detectors (SDDs), and conventional proportional counters. The Si PIN Detector PA200 occupies a compelling middle ground that offers many of the performance benefits of SDDs at a significantly lower system cost and complexity. While SDDs can achieve energy resolutions below 130 eV FWHM, they require sophisticated biasing networks with multiple high-voltage electrodes and often demand more complex cooling schemes. The PA200, by contrast, uses a simple two-electrode PIN diode structure that is inherently more robust and easier to drive, requiring only a single bias voltage and a standard TEC controller. Compared to conventional proportional counters, the PA200 delivers far superior energy resolution (139 eV vs. 15–20 % FWHM) and does not require high-voltage gas supplies or regular maintenance of the counting gas. Another important differentiator is the IDM manufacturing backbone: many competing PIN photodiodes and SDDs are designed by one company and fabricated by another, leading to potential mismatches between design intent and actual process capability. Nuchip's in-house fabrication eliminates this disconnect, ensuring that the silicon pin photodiode is manufactured exactly according to the optimized design. Furthermore, because Nuchip controls the entire supply chain, lead times are shorter and minimum order quantities are more flexible, which is a significant advantage for OEMs that need responsive replenishment. When total cost of ownership is considered, including the detector module, associated electronics, cooling, and maintenance, the PA200 often provides the best value proposition for applications that do not require the ultimate sub-130 eV resolution only achievable with state-of-the-art SDDs. For many XRF users, especially those performing alloy sorting, RoHS screening, and educational measurements, the PA200 delivers more than sufficient performance at a fraction of the total system cost.

The Si PIN Detector PA200 from Nuchip Photoelectric Technology stands as a compelling solution for any organization developing XRF spectrometers or upgrading existing analytical systems. Through its optimized silicon pin photodiode design, integrated thermoelectric cooling, and strict IDM quality control, the PA200 delivers energy resolution and count rate performance that meet the demands of professional material analysis, environmental compliance, and industrial sorting applications. The detector's 500 µm thickness ensures high efficiency across the 1.5–30 keV energy range, while the low leakage current and capacitance enable clean, high-fidelity spectral data that translates directly into more accurate element identification. The advantage of Nuchip's IDM model cannot be overstated: in-house design, wafer fabrication, packaging, and testing result in a product with superior consistency, traceability, and customization capability compared to detectors sourced through fragmented supply chains. Whether you require a bare detector module for in-house development or a fully integrated subassembly ready for instrument integration, Nuchip offers flexible configurations supported by expert application engineering. For a detailed quotation, sample evaluation, or technical consultation, we invite you to reach out through theCONTACT US page, where our team is ready to discuss your specific requirements. You can also explore the full range of radiation detection solutions, including other PIN photodiodes and SDDs, on the PRODUCTS page, and learn more about the company's mission to innovate in semiconductor detection technology on the HOME page. With the PA200, Nuchip demonstrates that domestic IDM manufacturing can deliver world-class performance, competitive pricing, and responsive support that empowers XRF instrument makers worldwide.