AS7331-AQFM - 3-Channel UVA/B/C Spectral UV Sensor | ams OSRAM
N.º de pieza: AS7331-AQFM ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.69 | $9,69 |
| 10 | $9.21 | $92,10 |
| 100 | $8.72 | $872,00 |
| 500 | $8.28 | $4.140,00 |
| 1.000 | $7.87 | $7.870,00 |
AS7331-AQFM Descripción general
A spectral UV sensor is an optical semiconductor that converts ultraviolet irradiance into a digital value. It sits within the sensor hierarchy: photodiode -> optical/ambient-light sensor -> spectral sensor -> environmental sensing subsystem, serving UV-index meters, disinfection monitors and laboratory instruments.
Key features include a high dynamic range adjustable up to 3.43E+10 via a 16-to-24-bit ADC, sensitivity up to 421 counts/(uW/cm2) in UVA, and a smallest LSB of 2.38 nW/cm2 at a 64 ms integration time. Irradiance responsivity is tunable through gain, conversion time and internal clock frequency, letting designers trade full-scale range against resolution. An integrated temperature sensor supports coarse compensation of thermal drift, and the I2C address is adjustable for multi-sensor buses.
Architecturally, the AS7331 converts photodiode currents through a low-noise analog front end into digital results, supporting continuous and triggered measurement modes with four low-power operating modes. The SYNC input enables externally synchronized sampling, while the RDY output (push-pull or open-drain) signals conversion completion - useful for deterministic sampling in process control.
Typical applications include UV index and personal exposure meters, UVC disinfection process monitoring, fluorescence detection, and UV measurement in mobile and wearable devices.
Design-wise, the glass or aperture area above the photodiodes must remain unobstructed, and the I2C bus should use appropriate pull-ups; the adjustable gain settings should be chosen so strong UVA sources do not saturate the ADC.
This page adds distributor pricing (as of 2026-10-11), drop-in alternative analysis, and design guidance beyond the manufacturer datasheet.
Alternativas directas para AS7331-AQFM — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con AS7331-AQFM (mismo factor de forma y huella) — difiere en Interface, Operating Modes, Package, Sensor Type, Supply Voltage.
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Solicitar alternativasAS7331-AQFM Valores máximos y características eléctricas
| Tipo de sensor | 3-channel spectral UV sensor (UVA/UVB/UVC) |
| Spectral Range | 260 nm to 360 nm |
| Canales | 3 (UVA, UVB, UVC) with interference filter technology |
| Interfaz | I2C (adjustable slave address) |
| Tensión de alimentación | 3.3 V |
| ADC Resolution | 16 to 24 bit |
| Dynamic Range | up to 3.43E+10 (adjustable) |
| Sensitivity (UVA) | up to 421 counts/(uW/cm2) |
| Smallest LSB | 2.38 nW/cm2 (at 64 ms integration time) |
| Operating Modes | 4 low-power modes; continuous and triggered measurement |
| Integrated Temperature Sensor | Yes (coarse thermal compensation) |
| Synchronization | SYNC input; RDY output (push-pull or open-drain) |
| Encapsulado | 16-pin OLGA / TFLGA, SMD |
| Tipo de montaje | Surface Mount |
| Packaging | Tape & Reel (LF T&R) |
Guía de configuración de pines de AS7331-AQFM 16-pin olga / tflga, smd
Configuración de pines para AS7331-AQFM (encapsulado 16-pin olga / tflga, smd). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para AS7331-AQFM.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
AS7331-AQFM es adecuado para 6 aplicacións: UV Index and Personal Exposure Meters, UVC Disinfection Process Monitoring, Fluorescence Detection, Mobile Device UV Measurement, Laboratory and Industrial UV Instrumentation, Smart Home and IoT UV Monitoring.
UV Index and Personal Exposure Meters
The AS7331-AQFM fits solar UV exposure measurement because its three filtered channels (260-360 nm) separate UVA and UVB the way UV index weighting requires, with UVB isolation provided by on-chip interference filters rather than external optics. Its sensitivity up to 421 counts/(uW/cm2) in UVA and smallest LSB of 2.38 nW/cm2 (64 ms integration) let a wearable resolve faint diffuse daylight, while the adjustable 16-to-24-bit conversion chain prevents saturation under direct midday sun. In a wearable or handheld dosimeter, the sensor is polled over I2C in continuous mode at low duty cycle from one of its four low-power operating modes to preserve battery life, and the integrated temperature sensor provides coarse compensation of responsivity drift across outdoor temperature swings.
Recomendado
UVC Disinfection Process Monitoring
UVC germicidal systems need closed-loop verification that 260-280 nm dose is actually delivered, and the AS7331-AQFM's dedicated UVC channel with interference-filter isolation directly answers this. Its high dynamic range (up to 3.43E+10) lets one sensor design cover both close-range high-irradiance fixtures and distant low-irradiance verification points by reprogramming gain and conversion time. The SYNC input allows triggered sampling synchronized to lamp PWM, and the RDY output (push-pull or open-drain) gives the process controller deterministic conversion-complete timing. In a disinfection cabinet, the sensor is mounted where the load sits, read over I2C after each SYNC pulse, and dose is integrated in firmware from the nW/cm2-scale LSB resolution, enabling per-cycle pass/fail logging.
Recomendado
Fluorescence Detection
Fluorescence assays emit weak light against a dark background, and the AS7331-AQFM's 2.38 nW/cm2 smallest LSB at 64 ms integration gives it the sensitivity to resolve these faint signals in the UVA/UVB bands where many fluorophores are excited. Because gain, conversion time and internal clock frequency are independently programmable, the analog front end can be tuned per assay: high gain with long integration for low-concentration samples, reduced gain for concentrated ones, all without changing hardware. The triggered measurement mode lets the system fire the excitation source, then sample only during the emission window using the SYNC input, suppressing ambient background. The I2C interface with adjustable address supports multi-well or multi-channel reader architectures on one bus.
Recomendado
Mobile Device UV Measurement
Smartphones and tablets increasingly expose UV sensing for weather and skin-health apps, and the AS7331-AQFM targets exactly this use case per the ams OSRAM product page. Its compact 16-pin OLGA SMD package fits the tight bezel and camera-island footprints of mobile hardware, while four low-power operating modes limit average current draw in always-listening exposure tracking. The I2C interface with adjustable address coexists with other phone sensors on the shared bus, and the 3.3 V supply matches common mobile rails. Integration effort is minimal: no external filters or optics are needed because each channel's interference filter is built into the die, so a smartphone maker gets calibrated three-band UV data from a single surface-mount part.
Recomendado
Laboratory and Industrial UV Instrumentation
Bench and inline instruments benefit from the AS7331-AQFM's quantifiable, programmable measurement chain: a 16-to-24-bit conversion with dynamic range up to 3.43E+10 and configurable LSB down to 2.38 nW/cm2 allows one design to span trace-level lamp leak checks and full-power irradiance calibration. In a laboratory dosimeter, the sensor sits behind a cosine-corrector, is triggered via SYNC for repeatability, and streams results over I2C to a logging MCU; the RDY flag enables gap-free acquisition. The integrated temperature sensor supports coarse thermal compensation between calibrations. Because channels are filtered on-die, no per-band optical alignment is required during manufacturing, which reduces production calibration cost compared to discrete-filter photodiode assemblies.
Recomendado
Smart Home and IoT UV Monitoring
IoT nodes that report UV conditions - garden sensors, pool-side stations, smart window controllers - can use the AS7331-AQFM as a drop-in three-band UV front end. Its I2C output connects directly to common wireless MCU platforms, and the adjustable I2C address permits several sensor nodes on one controller bus. The four low-power modes suit battery-operated nodes: the sensor sleeps between periodic conversions and uses RDY to wake the host only when data is ready, cutting average power. With an LSB of 2.38 nW/cm2 the node resolves overcast-day UV, while the extended dynamic range keeps readings valid in direct sun. Cloud dashboards can then display UVA/UVB/UVC separately, which a single broad-band UV sensor cannot provide.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AS7331-AQFM — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Package | 16-pin OLGA / TFLGA, SMD |
| Brand | ams OSRAM |
| Spectral Range | 260 nm to 360 nm (UVA/UVB/UVC) |
| Channels | 3 (UVA, UVB, UVC), interference-filtered |
| ADC Resolution | 16 to 24 bit |
| Dynamic Range | up to 3.43E+10 |
| Interface | I2C, adjustable address |
| Sensitivity (UVA) | up to 421 counts/(uW/cm2) |
| Smallest LSB | 2.38 nW/cm2 at 64 ms integration |
| Unit Price (qty 1, as of 2026-10-11) | $9.69 (LCSC) |
Diferenciadores clave
- True 3-band spectral separation on-die (frente a LTR390-UV)
- Extreme dynamic range with programmable resolution (frente a discrete UV photodiode + ADC)
- Trade-off: single-sourced niche package (frente a LTR390-UV)
Notas de diseño
Place the AS7331-AQFM so its optical aperture has an unobstructed field of view, and keep the OLGA-16 land pattern per the ams OSRAM datasheet footprint recommendation. Because the interference filters are on-die, no external filter glass is needed, but avoid placing UV-absorbing cover materials (polycarbonate blocks UVC strongly; use quartz or UV-transmitting acrylic if a window is required). Keep the sensor away from board edges where solder wicking could contaminate the window during reflow.
Use appropriate I2C pull-up resistors (typically 2.2k to 10k ohm depending on bus capacitance) and keep the bus short. Take advantage of the adjustable I2C address when networking multiple AS7331 sensors. Route the RDY line as a dedicated interrupt to the host MCU and configure it open-drain if it shares an interrupt line with other devices; use push-pull for lowest latency in deterministic triggered-sampling systems driven from SYNC.
Choose gain and conversion time so expected maximum irradiance does not saturate the ADC: direct sunlight UVA can exceed 1000 uW/cm2, so verify headroom against the 421 counts/(uW/cm2) maximum sensitivity setting. Do not rely on the integrated temperature sensor for precision correction - it is specified for coarse compensation only, so perform system-level calibration for demanding photometric use. Confirm the exact supply voltage and operating temperature range from the datasheet before finalizing power-tree design.
Información de cumplimiento
DigiKey listing shows 'OLGA16 LF T&R' suffix; LF is typically the lead-free designation but explicit RoHS/REACH compliance statements were not present in the verified data - confirm on the ams OSRAM product page.
