X-FAB’s reported ISOMOS1 module adds a 25 V isolation class to its 180 nm XH018 process. It is designed to shrink transistor-isolation structures in SPAD pixels, potentially leaving more room for optical area or tighter layouts. In one specific array example, Embedded reports about 25% less total area and a 30% higher fill factor than with older isolation options; those figures are not guarantees for other layouts.
What is X-FAB’s ISOMOS1 isolation class?
ISOMOS1 is an isolation class reported as an addition to X-FAB’s XH018, a 180 nm process that supports single-photon avalanche diode (SPAD) integration. The announcement describes it as a 25 V class intended to reduce the size of transistor isolation structures. Embedded’s report says the module integrates with X-FAB’s existing SPAD technology offerings without adding a mask layer. Embedded’s report does not provide the underlying technical note or detailed design rules, so treat these as announcement claims rather than independently verified process specifications.
Why transistor isolation geometry matters in SPAD arrays
A SPAD pixel combines a light-sensitive diode with surrounding circuitry. Isolation structures keep transistors electrically separated, but they also take up layout area. If those structures can be made smaller, a designer may be able to fit pixels more closely or devote a greater share of a pixel to its optical detection area. The useful outcome depends on the full pixel layout and design rules: a smaller isolation structure alone does not establish a particular array pitch, detection efficiency, or system-level performance.
What area and fill-factor improvement does the example report?
For a 4 × 3 SPAD array with 10 × 10 µm² optical areas, Embedded reports approximately 25% less total area and a 30% improvement in fill factor with ISOMOS1 compared with older isolation options. Both figures apply to that described example. The report does not provide a complete test method or independent validation, and it does not establish that other pixel geometries will see the same changes.
#1 Best Overall
- The VL53L0X time-of-flight range sensor is a cutting-edge laser range module. It is a fully integrated device featuring an embedded infrared laser that is safe for human eyes, advanced filters, and ultra-high-speed photon detection arrays, all designed to enhance range, speed and accuracy （Ranging distance within 2M, ranging accuracy: ±5% (high-speed mode), ±3% (high-precision mode)）
- The VL53L0X ToF laser ranging module is small, offering precise distance measurement regardless of target reflectance, unlike traditional technologies. It can measure absolute distances up to 2 meters, establishing a new standard in ranging performance and enabling numerous new applications
- The VL53L0X features a state-of-the-art SPAD (Single Photon Avalanche Diodes) array and incorporates patented second-generation flight sensing technology
- The VL53L0X features a 940nm VCSEL (Vertical Cavity Surface Emitting Laser) that is completely invisible to the human eye. Along with internal infrared filters, this design allows for extended range, increased resistance to ambient light, and improved durability against optical cross-talk from cover glass
- The VL53L0X's sensing capability enables a variety of functions, such as gesture and proximity detection for innovative user interfaces, obstacle detection and collision avoidance for floor sweepers and service robots, user presence detection or power control for home appliances and laptops, as well as applications in drones and Internet of Things (IoT) devices
For a process evaluation, designers should compare like-for-like layouts and confirm the relevant definitions and constraints in the current process design kit (PDK). Useful comparison points include total pixel area, optical fill factor, array pitch, isolation-voltage class, mask count, SPAD active area, wavelength response, and applicable design rules. The report supplies only the example area and fill-factor comparison, the 25 V class, and the no-additional-mask claim; it does not provide a full data set for ranking process options or foundries.
Which X-FAB process supports SPAD integration?
The reported platform is XH018, X-FAB’s 180 nm process. Embedded says its SPAD offering includes devices with active detection areas from 10 µm to 20 µm and a diode optimized for near-infrared light. These are platform details reported in the announcement, not evidence that ISOMOS1 has been validated for every device or wavelength application.
Rank #2
- The VL53L0X time-of-flight (ToF) range sensor is an advanced laser ranging module. This fully integrated device features an embedded eye-safe infrared laser, high-performance optical filters, and an ultra-fast photon detection array—optimized for superior range, speed, and accuracy (Ranging distance: up to 2m; Accuracy: ±5% in high-speed mode, ±3% in high-precision mode)
- The VL53L0X ToF laser ranging module is compact yet powerful, delivering precise distance measurement independent of target reflectance—a key advantage over conventional methods. Capable of measuring absolute distances up to 2 meters, it sets a new benchmark in ranging performance, unlocking a wide range of innovative applications
- The VL53L0X integrates a cutting-edge SPAD (Single Photon Avalanche Diode) array and employs patented second-generation time-of-flight sensing technology
- The VL53L0X incorporates a 940nm VCSEL (Vertical-Cavity Surface-Emitting Laser) that is entirely invisible to the human eye. Combined with integrated infrared filters, this architecture enables extended ranging capability, enhanced ambient light immunity, and superior robustness against optical crosstalk from cover glass
- The VL53L0X's advanced sensing capability enables diverse applications including: gesture and proximity detection for intuitive user interfaces; obstacle detection and collision avoidance in robotic vacuums and service robots; user presence sensing and smart power management for home appliances and laptops; as well as drone navigation and IoT (Internet of Things) device integration
What should designers verify before using ISOMOS1?
Embedded says PDKs and models incorporating ISOMOS1 are available to designers, but its report does not state a PDK revision, design-rule details, qualification status, or access terms. Before making layout or tape-out decisions, confirm those particulars and the 25 V class’s applicable constraints with current X-FAB documentation or the foundry. The report does not establish pricing, commercial terms, measured photon-detection probability, or performance in a named end product.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where SPAD technology is used
SPADs are used or considered for applications including direct time-of-flight sensing, LiDAR, 3D imaging, AR/VR depth sensing, quantum communication, biomedical sensing, industrial distance measurement, and robotics. This is context for SPAD technology generally; the announcement does not demonstrate ISOMOS1 performance in each of these applications.
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Quick Recap
Best Value
- The VL53L0X time-of-flight (ToF) sensor represents a breakthrough in laser distance measurement technology. This compact, fully-integrated solution combines an eye-safe infrared laser emitter with precision optical filters and a high-speed SPAD (Single Photon Avalanche Diode) array, delivering industry-leading performance in measurement range, response speed, and accuracy (Measurement range: 0-2m; Accuracy: ±5% in high-speed mode, ±3% in high-accuracy mode)
- The VL53L0X ToF laser ranging module combines compact form factor with exceptional performance, providing accurate distance measurement unaffected by target surface properties - a significant improvement over traditional ranging solutions. With a maximum measurement range of 2 meters, this module establishes new industry standards for precision ranging while enabling breakthrough applications across multiple domains
- The VL53L0X incorporates an industry-leading SPAD (Single Photon Avalanche Diode) array and utilizes proprietary second-generation ToF (Time-of-Flight) measurement technology
- The VL53L0X integrates an eye-safe 940nm VCSEL (Vertical-Cavity Surface-Emitting Laser) with invisible spectrum emission. Its system architecture, featuring built-in IR filters, delivers exceptional performance including extended detection range, improved ambient light rejection, and excellent cover glass crosstalk immunity
- The VL53L0X's high-precision ToF sensing technology unlocks multiple application scenarios: intuitive gesture recognition and proximity sensing for enhanced HMI (Human-Machine Interface); reliable obstacle avoidance for robotic cleaners and service robots; intelligent presence detection and power-saving control in smart home devices and PCs; plus advanced navigation support for drones and seamless IoT system integration
Rank #4
- Ultra-Precise Ranging: Advanced STToF technology ensures accurate distance measurements from 4cm to 4m regardless of target color or reflectivity
- Programmable ROI Control: Customizable field of view allows multi-zone operational control with 27 degree typical FoV for flexible application integration
- Enhanced Ambient Performance: Integrated 940nm Class1 emitter and IR filters maintain optimal ranging accuracy in various lighting conditions
- High-Speed Measurement: Operates at up to 50Hz frequency with I2C interface support for rapid data acquisition and real-time processing
- Complete Package Solution: Includes sensor module and pin headers for effortless installation and immediate project implementation
Rank #3
- VL53L0X Lidar Sensor 2m Range High Precision Single-Point Distance Sensor: Working Voltage: 3-5V; Communication Mode: IIC; Absolute Distance Measurement: 2m
- Accurate Distance Measurement: The VL53L0X ToF Lidar Sensor Uses Advanced Time-of-Flight (ToF) Technology and a SPAD Array (Single Photon Avalanche Diode) to Measure Absolute Distance up to 2M with 1mm Resolution, Even On Low-Reflectivity Targets. Its Ultra-Compact 4.4x2.4x1.0mm Module Integrates a 940nm VCSEL Infrared Light Source
- Stable Performance: VL53L0X Module Equipped with Integrated Infrared Filters and Optical Crosstalk Compensation, this Lidar Rangefinder Maintains Accuracy in High IR Environmental Light Conditions, Perfect for Obstacle Avoidance in Robotics or Hand Detection in Automatic Faucets
- Plug-and-Play Integration:With 50Hz High-Speed Measurement, it Enables Real-Time Distance Tracking for Applications Such as Gesture Recognition, Auto-Focus Cameras, or Smart Home Automation
- Energy-Efficient: Lidar Module Ensures Reliability in a Variety of Environments. Operating Voltage is 3-5V. Low Power Consumption of 20mW (5μA standby) Ensures Efficient Operation in Battery-Powered Devices. Choose Between High-Precision (±3%) or High-Speed (±5%) Modes to Optimize Performance for Your Application
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