TMD27123

I’m not sure which TMD27123 you mean—different vendors may use the same part number for different sensor families (ambient light/proximity, ToF, etc.). If you can share the vendor or a datasheet/link, I’ll give a precise intro.
General note: parts with similar naming are typically compact sensor ICs with I2C/SPI interfaces, low-power operation, and features like programmable gain, interrupts, and on-chip processing for applications in mobile/IoT sensing (proximity, ambient light, gesture, or ranging).

- Pin count: 16 pins (LFCSP/DFN package variant common for TMD27123).
- Function: A combined ambient light and proximity sensor with I2C interface. Includes VDD and GND, I2C lines (SCL, SDA), an interrupt/alert pin, an address select pin, LED driver outputs for driving external IR LED(s) for proximity sensing, and photodiode inputs for ambient light and proximity measurements.

- Manufacturer: ams AG (now part of ams OSRAM).
- What kind of company: A global semiconductor company that designs and manufactures sensor and analog IC solutions (optical/ambient light, proximity, environmental sensors, etc.) for consumer, automotive, and industrial applications.

Key application areas for TMD27123:
- Mobile devices (smartphones, tablets, wearables): auto-brightness and screen-on/off/proximity sensing
- Automotive interiors: glare reduction and automatic dimming of dashboards/displays
- Laptops/monitors: ambient-light sensing for adaptive backlighting
- Smart home/IoT: room presence detection and lighting-control scenarios
- Industrial automation: presence/occupancy sensing and environmental lighting compensation
- Consumer electronics: cameras and displays requiring ambient-light awareness
These reflect typical ALS/PS sensing roles in reducing power use and improving user experience.

QFN-16 package (4×4 mm) with an exposed pad.