传感器
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NHS3100UK/A1 - NTAG SmartSensor Temp Logger NFC IC | NXP
The NXP Semiconductors NHS3100UK/A1 is an NTAG SmartSensor temperature logger IC with an embedded NFC interface (13.56 MHz, ISO/IEC 14443), an internal temperature sensor, and an Arm Cortex-M0+ microcontroller core, housed in a 25-ball WLCSP (UFBGA-25) package operating from 1.72 V to 3.6 V. A temperature logger IC is a specialized sensor-integrated system-on-chip that measures, stores, and communicates environmental temperature data without continuous external supervision. Within the power management and sensor signal chain hierarchy, it combines a temperature sensor, a microcontroller, nonvolatile logging memory, and a wireless (NFC/RFID) front end on a single die, functioning as both a passive transponder and an active data recorder for cold chain and condition monitoring systems. Key features include the embedded Arm Cortex-M0+ processor, which lets developers implement custom logging algorithms and data formats; the NTAG-class NFC interface operating at 13.56 MHz with ISO/IEC 14443 compliance, allowing field data retrieval with any NFC smartphone; and a direct battery connection architecture that minimizes external component count. Per the NXP datasheet, the device supports a minimal-BOM, single-layer foil antenna solution. Technically, the NHS3100 integrates the temperature sensing channel, digital IOs, I2C and SPI interfaces, and SWD debug access alongside the RF front end. The Cortex-M0+ core executes user firmware for threshold detection, sampling scheduling, and data compression in logging memory, so the IC can run autonomously for months on a small coin cell while remaining fully addressable over NFC. Typical applications include cold chain shipment monitoring for pharmaceuticals and food, temperature-logged medical transport and vaccine vial monitoring, and smart condition-monitoring labels where a smartphone reads the log wirelessly at the point of delivery. A key design consideration is antenna tuning: the NFC front end expects a matched 13.56 MHz antenna on the PCB or foil, and layout directly influences read range. Battery selection must respect the 1.72 V minimum supply. This page synthesizes distributor availability data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
NTHS0603N01N1003JR - 100kΩ NTC 0603 3964K SMD Thermistor
The Vishay Dale NTHS0603N01N1003JR is a 100 kΩ surface-mount NTC thermistor in the industry-standard 0603 (1608 metric) chip footprint, designed for precision temperature sensing with a beta value (β25/85) of 3964 K. The NTHS family combines a small form factor (1.6 mm × 0.8 mm) with a robust nickel-barrier solderable termination system, making it suitable for high-volume reflow and wave-solder processes used on modern mixed-technology PCB assembly lines. An NTC (Negative Temperature Coefficient) thermistor is a thermally sensitive resistor whose resistance decreases predictably as temperature rises. The defining parameter is the β (beta) constant, which characterizes the slope of the resistance-temperature curve according to the Steinhart-Hart relationship; a β25/85 value of 3964 K indicates a moderate sensitivity suited to ambient and board-level monitoring across 0 °C to 70 °C, where the part is commonly deployed. NTC thermistors sit within the broader sensor hierarchy of temperature sensor → thermistor → NTC → SMD chip NTC, and are widely preferred over RTDs in cost- and size-sensitive designs. Key features include 100 kΩ nominal resistance at 25 °C (within a ±5% tolerance band as suggested by the 'J' suffix), a dissipation constant in the 1 mW/°C range, and a thermal time constant on the order of seconds in still air. The 0603 footprint is compatible with standard pick-and-place tooling and EIA 481 tape-and-reel packaging. Operating temperature range is typically -40 °C to +125 °C, allowing deployment in industrial, automotive, and consumer environments where the thermistor is referenced against a known pull-up resistor or ADC reference. Typical applications include battery pack temperature monitoring, CPU/MCU die or PCB thermal supervision, HVAC inlet/outlet sensing, and precision analog front-ends where the thermistor is paired with a microcontroller's ADC input. The 100 kΩ nominal value pairs cleanly with reference resistors in the same decade, simplifying the look-up-table math in firmware. When designing with this part, derate power at elevated ambient temperatures and apply a Steinhart-Hart or β-based polynomial for accurate conversion from resistance to temperature across the application range. The 'J' tolerance suffix (±5%) is suitable for general-purpose monitoring; tighter tolerance parts (F = ±1%, G = ±2%) are available in the same NTHS0603 family for instrumentation-grade designs.
OPT211 - Monolithic Photodiode + Transimpedance Amp | Burr-Brown (TI)
The Burr-Brown OPT211 is a monolithic photodiode with on-chip FET-input transimpedance amplifier, providing wide bandwidth at very high gains. It integrates a silicon photodiode and a low-noise FET-input op-amp transimpedance stage in a single 8-pin DIP package (suffix P), with uncommitted input and feedback nodes for application-specific feedback networks. The device operates from +/-2.25 V to +/-18 V supplies. A monolithic photodiode plus transimpedance amplifier (TIA) combines a light-sensing element and a current-to-voltage conversion stage on one die. Photodiodes generate a small photocurrent proportional to incident light; a transimpedance amplifier converts that current into a usable voltage with high gain and low noise, which is critical in optical sensing front-ends. This category sits within optical sensors and front-end analog ICs, used wherever light must be measured precisely, from scientific instruments to industrial position sensing. Key features include very high transimpedance gain (up to 10^8 V/A typical), bandwidth up to several hundred kHz at moderate gain, low dark current due to on-chip FET input, and a wide dynamic range achievable through trade-offs between responsivity, bandwidth, and SNR. The uncommitted input and feedback pins allow designers to choose feedback resistor values for optimized noise-bandwidth trade-offs and to add filtering stages for specific applications. The OPT211's architecture pairs a diffused silicon photodiode with a precision FET-input op-amp transimpedance topology. Because the photodiode and amplifier share the same die, parasitic capacitance and leakage are minimized compared to discrete implementations, improving noise performance at high gain. The exposed feedback node allows external compensation, gain setting, or T-network feedback for very high effective transimpedance. Typical applications include precision photometry, optical position encoders, laser power measurement, smoke detectors, barcode scanners, spectrophotometers, and medical analytical instruments. It is well suited for low-light-level detection where the integrated front-end reduces PCB complexity and stray noise pickup. When designing with the OPT211, pay close attention to PCB layout: keep feedback components close to the feedback pin, use a guard ring around the input traces, and provide proper supply bypassing (0.1 uF ceramic in parallel with a larger tantalum or ceramic). Note that the OPT211 is a legacy Burr-Brown part now owned by Texas Instruments; long-term availability should be verified before new designs.
OX08D20 - 8MP Automotive CMOS Image Sensor TheiaCel | OMNIVISION
The OMNIVISION OX08D20 is an 8-megapixel (8 MP) CMOS image sensor with TheiaCel technology for automotive exterior cameras, offering best-in-class low-light performance, LED flicker mitigation, and low power consumption in a compact a-CSP package approximately 50% smaller than other exterior sensors in its class. A CMOS image sensor is a semiconductor device that converts light into electrical signals using an array of photodiodes and active pixel circuits. Within the vision-system hierarchy, the image sensor sits at the core of the camera module, above the lens and below the image signal processor, and feeds ADAS domains such as perception, object detection, and driver monitoring. Automotive image sensors must additionally meet stringent requirements for temperature resilience, cybersecurity, and low-light dynamic range. The OX08D20 integrates the features automotive OEMs seek in a single device: superior image quality at high temperatures, LED flicker mitigation for reliable traffic-sign and signal-light recognition, compact size for streamlined camera modules, and low power for thermal management. According to OMNIVISION, it also updates cybersecurity to the latest industry standard, MIPI CSE 2.0, protecting the image data path in connected vehicles. Positioned as the successor to the widely adopted OX08D10 launched in 2023, the OX08D20 targets exterior cameras used in advanced driver assistance systems (ADAS) and autonomous driving (AD), where reduced motion blur and strong low-light sensitivity are critical for night and adverse-weather scenes. TheiaCel technology combines large photodiode architecture with correlation techniques to suppress motion artifacts and LED flicker simultaneously. Typical applications include front-view main cameras for ADAS, surround and rear-view systems, and autonomous driving perception stacks requiring 8 MP resolution. Engineering teams should verify the exact output interface, frame rate, and supply rails against the OMNIVISION product brief during schematic capture, since detailed electrical parameters are distributed under NDA. Sampling began in November 2025, with mass production scheduled for Q4 per OMNIVISION's announcement. This page synthesizes verified manufacturer announcements, drop-in alternative analysis, and practical sourcing context not found in the manufacturer product brief. Pricing reflects quote-based availability as of 2026-09-13.
PMMA7660FCR1 - 3-Axis Digital Accelerometer I2C/SPI | NXP/Freescale
The NXP (formerly Freescale Semiconductor) PMMA7660FCR1 is a low-power 3-axis digital output accelerometer offering user-selectable g-ranges from ±1.5g to ±6g (configurable to ±8g via register), an integrated sleep mode, and I2C/SPI-compatible digital interface. Delivered in a small surface-mount DFN package, it provides 6-bit signed output resolution with 32 sample-set registers for embedded orientation detection and gesture-recognition. A digital accelerometer is a micro-electromechanical-systems (MEMS) sensor that measures acceleration along the X, Y, and Z axes and reports it as a digital word over a serial bus, replacing older analog-output accelerometers with built-in ADC and embedded firmware. As a category, MEMS accelerometers sit inside the sensor family and the broader signal-conditioning and power-management hierarchy of mixed-signal ICs. The PMMA7660FCR1 is a second-generation part in NXP's MMA7660 family and shares its pinout and register map with the earlier MMA7660FCR1, allowing direct firmware reuse. Key differentiating specifications include a 1.5g/3g/6g/8g user-selectable full-scale range, ±0.5g offset calibration accuracy, 5 mA typical active supply current, and an always-on auto-wake/sleep engine. According to the manufacturer datasheet, the part supports up to 400 kHz I2C (Fast-mode) and SPI at speeds up to 1 MHz. Multiple user-selectable data rates from 1 to 120 samples-per-second allow designers to trade power consumption versus update rate. Architecturally the device combines a MEMS mechanical element with a mixed-signal ASIC front-end and an embedded firmware state machine that handles orientation recognition, tap detection, and shake detection in hardware. This offloads the host microcontroller from continuous polling and is one reason this family remains popular in ultra-low-power consumer designs. Typical applications include smartphone tilt/orientation detection, tablet and e-reader screen rotation, portable gaming motion input, IoT fall-detection wearables, and remote controls with gesture input. The wide supply range and ultra-low standby current also suit battery-powered smart-home sensor nodes. When designing with this device, ensure the I2C address selection (pin 7 high or low) is tied to the correct logic level for the host bus, and add 0.1 µF decoupling close to the supply pin. Take care to limit supply ramp time and follow the power-on-reset sequence defined in the manufacturer datasheet. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single manufacturer datasheet revision, with all data traced to live distributor listings and the manufacturer datasheet.
PX309 - Stainless Steel Pressure Transducer 5000 psi | Omega Engineering
The Omega Engineering PX309-5KGI is a stainless-steel industrial pressure transducer rated for 0 to 5000 psi gauge measurement with a 4-20 mA current-loop output. It uses a high-accuracy silicon strain-gage sensor molecularly bonded to a stainless-steel diaphragm, packaged in a rugged all-stainless-steel cylinder housing with a 1/4 inch NPT male process connection. A pressure transducer (also called a pressure transmitter) is an electromechanical sensor that converts an applied fluid or gas pressure into a proportional electrical signal for monitoring, control, or data acquisition. Within the broader sensor taxonomy it sits as: pressure sensor -> transducer -> industrial sensor -> measurement instrument. The 4-20 mA current-loop output is the dominant industrial standard because it is intrinsically safe over long cable runs and is immune to voltage drop on the wiring. Key features include 0.25 percent or 0.5 percent accuracy classes, long-term stability with low drift, an operating temperature range suited to process environments, and 316L stainless-steel wetted materials compatible with a wide range of media. The series spans gauge, absolute, compound-gauge, and vacuum pressure types, with selectable pressure ranges from a few psi up to 10,000 psi, making it a versatile workhorse for general-purpose industrial use. The PX309 below 100 psi uses an oil-filled isolation diaphragm that protects the silicon sensing element, while 100 psi and above units bond strain gages molecularly to the diaphragm directly. The all-welded stainless-steel construction provides excellent media compatibility and corrosion resistance, which is critical in hydraulic, chemical, and oil-and-gas applications where aggressive fluids would attack alternative elastomer-sealed sensors. Typical applications include HVAC system pressure monitoring, hydraulic system pressure feedback, process-control loops in chemical plants, pump and compressor monitoring, water and wastewater treatment pressure measurement, and factory-automation panels. When wiring this transmitter, supply 12 to 30 Vdc loop excitation, route the cable away from VFD inverters and large motors to minimize EMI, and use a 250-ohm sense resistor across the receiver input to convert 4-20 mA to 1-5 Vdc for older analog-input cards. This page synthesizes distributor pricing, application guidance, and a comparison with cross-brand alternatives that is not available in the stock Omega datasheet alone.
PX409 - 0.08% High Accuracy Pressure Transducer | Omega Engineering
The Omega Engineering PX409 is a configurable, high-accuracy pressure transducer that delivers ±0.08% accuracy with a 5-point NIST-traceable calibration certificate included with every unit. Built around a micro-machined silicon strain-gauge sensing element with all-stainless-steel wetted parts and welded construction, the PX409 series supports gauge, absolute, vacuum, differential, and compound pressure ranges from inches of water up to 10,000 PSI. Standard output options include 4-20 mA, 0-5 VDC, 0-10 VDC, ±10 VDC, USB, and RS-485, suiting both legacy analog loops and modern digital data-acquisition systems. A pressure transducer is a sensor that converts an applied fluid or gas pressure into a proportional electrical signal, typically voltage or current, for monitoring, control, or recording purposes. As a category, pressure transducers sit inside the broader hierarchy of pressure sensors -> sensors -> instrumentation -> industrial automation. Within that taxonomy, the PX409 is positioned as a high-accuracy, industrial-grade transmitter engineered for demanding test-stand, hydraulic, and process-control environments where traceability and long-term stability outweigh low-cost priorities. Key features include ±0.08% Best-Fit-Straight-Line (BFSL) accuracy, ±0.03% linearity option, all-stainless-steel 17-4 PH or 316L wetted parts, welded hermetic sealing, 3X full-scale burst pressure rating, and premium temperature compensation across a -20 °C to +85 °C operating range. The unit ships with a NIST-traceable calibration certificate documenting five calibration points across the pressure range, supporting ISO 17025 and calibration-quality requirements in regulated industries. Architecturally, the PX409 uses a micro-machined silicon diaphragm with a piezoresistive Wheatstone bridge. Onboard signal conditioning provides amplified, temperature-compensated output, eliminating the need for external instrumentation amplifiers in most applications. The robust mechanical design uses a 1/4" NPT male process connection as standard, with alternate fittings (1/2" NPT, 1/4" BSP, 7/16-20, SAE, or compression fittings) available via the factory configurator. Typical applications include hydraulic and pneumatic system monitoring, test and measurement instrumentation, fuel-pressure mapping on engine dynamometers, tank-level hydrostatic measurement, refrigeration and HVAC pressure monitoring, pharmaceutical and food-processing line verification, and cleanroom / laboratory gas-line verification. The 4-20 mA option is particularly suited to long cable runs and noisy industrial environments where voltage signals would otherwise suffer degradation. When integrating the PX409, observe the rated overpressure and burst specifications carefully. Hydraulic spikes and water-hammer events can exceed the rated pressure even when steady-state pressure is within range. For differential or vacuum models, keep the low-pressure side clean and dry; moisture ingestion is the most common service-life failure mode. This page synthesizes distributor pricing, datasheet specifications, drop-in alternative part options from the same Omega family, and practical installation guidance not consolidated on the manufacturer product page.
RO - Reverse Osmosis System | Standard RO Water Treatment
The RO Reverse Osmosis (RO) system is a water purification technology that removes dissolved ions, organics, particles, and microorganisms by forcing feed water through a semi-permeable membrane under pressure. RO membranes typically reject 95-99.5% of total dissolved solids (TDS) and produce permeate flows characterized by a steady-state flux rate in the L/m²/hr (LMH) range, depending on element geometry and operating pressure. Standard RO systems are packaged as 4040 (4-inch x 40-inch) or 8040 (8-inch x 40-inch) spiral-wound elements that fit industry-standard pressure vessels and operate between 1.0-1.5 MPa of feed pressure with up to 15% recovery per stage. An RO membrane element is a separation device within the broader water-treatment hierarchy: RO element → thin-film composite membrane → spiral-wound module → RO system → water purification unit → industrial process subsystem. Reverse osmosis (also called hyperfiltration) is distinguished from nanofiltration (NF) by its near-total ionic rejection, from ultrafiltration (UF) by its ability to remove monovalent salts, and from microfiltration (MF) by its ability to remove dissolved species below 1 nm. Key features of standard RO elements include thin-film polyamide composite membranes laminated onto a microporous polysulfone support, a 28-mil or 34-mil feed spacer, a permeate tube sealed by anti-telescoping device (ATD) end caps, and a standard 1.125-inch (4040) or 3.875-inch (8040) outer diameter. Most elements carry NSF/ANSI 61 certification for potable water contact and operate across a feed pH window of 2-11 (continuous) and 1-13 (cleaning), with maximum feed water temperature of 45°C and free chlorine tolerance of less than 0.1 mg/L. The polyamide chemistry provides the dense skin layer responsible for ionic rejection, while the polysulfone layer provides mechanical strength. Rejection is driven by solution-diffusion through the dense layer, with the support layer providing only hydraulic permeability. Operating pressure, recovery, and feed water chemistry (TDS, pH, temperature) jointly determine permeate quality and flux. Typical applications of standard RO elements include brackish water desalination (BWRO), seawater desalination (SWRO at higher pressure), ultrapure water for semiconductor and pharmaceutical manufacturing, boiler feed pre-treatment in power generation, food and beverage concentration/dewatering, and residential point-of-use drinking water. The wide feed-tolerance range supports single-stage and two-stage process trains. When designing with standard RO elements, size the high-pressure pump to deliver feed pressure above the osmotic pressure of the concentrate, plus the net driving pressure required for the design flux. Always include cartridge filtration (5 micron nominal) upstream of the RO train and avoid operating continuously above 15% recovery per element to prevent scaling and fouling.
RPR-0730 - 940nm IrVCSEL Analog Photoreflector | ROHM
The ROHM Semiconductor RPR-0730 is an ultra-compact analog reflective optical sensor (photoreflector) integrating a 940nm infrared VCSEL (IrVCSEL) emitter and a high-speed phototransistor receiver in a single 6-SMD, no-lead surface-mount package. It detects the approach of a person or object at a sensing distance of 0.394" (10 mm) by analyzing the intensity of light reflected back from a nearby surface, outputting an analog photocurrent proportional to the reflected irradiance. What is a photoreflector? A photoreflector (also called a reflective optical sensor or photo interrupter-reflective type) is an optoelectronic device that combines a light emitter (typically an IR LED or VCSEL) and a photodetector (phototransistor, photodiode, or analog front-end IC) in a single package oriented so that the emitter beam reflects off a target surface back into the detector. Photoreflectors belong to the broader category of optical sensors within the sensor hierarchy: photoreflector -> optical proximity sensor -> reflective photosensor -> optoelectronic sensor -> electronic component. They are widely used for non-contact presence, distance, and surface detection where a simple binary or analog reading is sufficient. Key features of the RPR-0730 include a proprietary 940nm VCSEL emitter (replacing conventional IR LEDs for superior directionality and lower power consumption), a typical sensing distance of 10 mm, an analog output proportional to reflected light intensity, an ultra-compact SMD footprint, and integrated optical filtering tuned to the VCSEL wavelength to reject ambient light. The VCSEL architecture offers narrower spectral bandwidth and a more tightly collimated beam than a typical 940nm LED, improving signal-to-noise ratio in daylight and under fluorescent lamp interference. Typical applications include human proximity detection in sanitary equipment (faucets, soap dispensers, hand dryers, toilet flush valves), paper/end-of-tape detection in printers and ATMs, object detection on industrial conveyors, and energy-saving wake/sleep control for displays and appliances. The analog output allows threshold-based triggering with a single comparator or, with an ADC, continuous distance estimation within the useful range. When designing with the RPR-0730, mount the sensor so the optical axis is perpendicular to the target surface and provide a dust/condensation-free optical window, since the analog output is sensitive to both surface reflectance and contamination. Decouple VCC with a 0.1uF ceramic capacitor close to the pins and use the analog output through a transimpedance amplifier or comparator to convert photocurrent into a usable logic level. This page synthesizes distributor pricing, package details, and practical design guidance for the RPR-0730 beyond the datasheet alone.
SFH 7070 - BIOFY PPG Biomonitoring Sensor Module | ams OSRAM
The ams OSRAM SFH 7070 is a BIOFY™ reflective biomonitoring sensor module featuring two green LED emitters and one photodetector in a single multi-chip package measuring 7.5 mm x 3.9 mm x 0.9 mm, optimized for strong photoplethysmography (PPG) signal acquisition in wearable devices. A reflective optical biosensor module integrates light emitters and a photodetector on one substrate so that light reflected from human skin — modulated by blood volume changes — can be measured without a transmissive finger clip. Within the sensing hierarchy, the SFH 7070 belongs to the optical sensor -> photoplethysmography sensor -> biometric/biomonitoring module class, sitting above discrete LEDs and photodiodes and below complete vital-sign signal processor ICs. Key features include an integrated light barrier that blocks optical crosstalk between the emitters and detector, ESD robustness of 2 kV according to ANSI/ESDA/JEDEC JS-001 (HBM, Class 2), and a wide 120-degree beam angle that maximizes returned PPG signal over skin. The green emission wavelength is well absorbed by hemoglobin and penetrates shallowly, which is ideal for wrist-worn heart-rate tracking because it suppresses motion artifacts compared with infrared. Technically, the multi-chip construction places two green emitters flanking the detector chip behind the optical barrier, allowing the designer to drive both emitters sequentially or in parallel to increase photon flux into dark or highly pigmented skin, improving SNR of the AC PPG component. Surface-mount termination supports standard reflow assembly on flexible or rigid PCBs, and the low profile of 0.9 mm suits slim smartwatch enclosures. Typical applications include wrist heart-rate monitors, fitness bands, smartwatches, and medical-grade pulse-oximetry-adjacent biomonitoring patches where strong green PPG signals are required. When designing with the SFH 7070, drive the LEDs with low-noise constant-current pulses and time-synchronize sampling of the detector with emission windows to reject ambient light; verify the datasheet for absolute maximum current ratings per emitter. This page synthesizes distributor availability data, datasheet-derived specifications, alternatives analysis, and practical design notes not found in the manufacturer datasheet alone.
SI7051-A20-IMR - I2C Temperature Sensor, ±0.1°C, 6-DFN | Silicon Labs
The Silicon Labs SI7051-A20-IMR is a digital I2C temperature sensor with ±0.1°C maximum accuracy (human-body calibrated), a 14-bit analog-to-digital converter with signal processing, and a low-power CMOS band-gap sensing element, all integrated in a 6-pin DFN (3x3 mm) package. It operates from -40°C to +125°C and supports an industry-leading low supply current suitable for always-on thermal monitoring in battery-powered designs. The exposed pad on the bottom of the package provides a low thermal resistance path to the PCB, enabling fast settling time and accurate board-level temperature measurement. I2C addresses are factory-programmable. A digital temperature sensor is an integrated circuit that combines a silicon band-gap sensing element, an analog-to-digital converter, calibration data, calibration logic, and a digital interface (typically I2C or SPI) into a single chip. Within the broader component hierarchy, the SI7051-A20-IMR belongs to the digital temperature sensor sub-family of thermal management sensors, which sits under board-mount sensors and ultimately under the semiconductor category. Compared with thermistor-based or RTD-based analog solutions, a digital sensor eliminates the user's need for ADC channel allocation, linearization math, and per-board calibration, replacing those tasks with a calibrated I2C read. Key differentiating features include ±0.1°C maximum accuracy calibrated for the human body temperature range, 14-bit resolution (0.01°C per LSB typ.), low quiescent current suitable for battery applications, calibration data stored on-chip, and a factory-programmable I2C address. The wide operating range and digital output also remove many of the noise-coupling and linearization concerns that complicate analog sensor front-ends. Architecturally, the device integrates a CMOS band-gap sensor whose PTAT-proportional output is digitized by a sigma-delta-style ADC, then compensated in an on-chip DSP using factory calibration coefficients. The I2C-compatible interface supports standard and fast modes, allowing the host microcontroller to query temperature on demand or at a programmed sampling interval. This combination of integrated calibration and low-power operation is what enables the device to achieve both high accuracy and low energy-per-measurement. Typical applications include wearable body-temperature monitoring (where the ±0.1°C accuracy is human-body-calibrated), HVAC thermostat control, environmental logging IoT nodes, cold-chain asset tracking, and industrial equipment thermal protection. Its small DFN-6 footprint and low power make it well suited to dense consumer and portable designs. When designing with this device, note that the I2C SDA/SCL lines require pull-up resistors to the system logic rail (typically 1.8V, 3.3V, or 5V) and that adequate thermal coupling (thermal vias or copper pour to the exposed pad) is required for accurate ambient temperature measurement; self-heating is minimal but not zero at high conversion rates. This page synthesizes distributor pricing across DigiKey and Mouser, six drop-in alternatives in the same DFN-6 (3x3) footprint, and practical design notes not found in the manufacturer datasheet alone.
SLB - Stainless Steel Single-Ended Beam Load Cell | Flintec
The Flintec SLB is a high-accuracy, low-profile, single-ended bending-beam load cell with full stainless-steel construction and potted environmental sealing, designed for tough industrial weighing applications. The SLB is offered in five capacities: 200 lb, 500 lb, 1,000 lb, 2,500 lb, and 5,000 lb (91 kg to 2,268 kg metric equivalents), making it one of the most flexible bending-beam families on the market. According to the Flintec SLB datasheet, the device carries an OIML R60 accuracy class rating with up to C3 (3,000 verification intervals) and is NTEP-rated for legal-for-trade use, which is unusual for a beam cell in this capacity range. A bending-beam load cell is a force transducer that converts an applied mechanical load into a measurable electrical signal via strain gauges bonded to a metal element that deflects proportionally under load. The SLB belongs to the broader category of strain-gauge load cells, which sit within the sensor hierarchy of load/force sensors -> weighing sensors -> industrial measurement transducers -> sensors. Bending-beam cells are typically used in tank, hopper, platform, and process-scale installations where low profile, hermetic sealing, and high repeatability are required. Key features of the SLB include 17-4 PH stainless-steel construction, hermetically sealed to IP67/IP68, a six-core shielded cable with strain-relief boot, integrated overload protection to approximately 150% of rated capacity, and laser-welded strain-gauge sealing that eliminates potting failures in humid or wash-down environments. The cell uses a four-wire (plus sense) bridge configuration with a nominal 2 mV/V output and 350-ohm bridge impedance, allowing direct connection to most industrial weight indicators and PLCs. Typical applications include truck and rail scales, batching and mixing hoppers, tank and silo weighing, in-process checkweighing, and OEM platform scales. The SLB's wide capacity range lets one mechanical design replace several single-capacity beam cells across a product line. When installing the SLB, use self-aligning mounting hardware to prevent side-load errors, and torque mounting bolts to the values listed in the datasheet to avoid preload shifts that compromise zero stability.
STC42A - Automotive H2 Thermal Conductivity Sensor | Sensirion
The Sensirion STC42A is an automotive-grade hydrogen (H2) gas sensor based on the thermal conductivity measurement principle, delivering reliable hydrogen concentration measurements in clean air within a QFN package supplied on tape and reel. It communicates over an I2C controller interface and performs autonomous humidity compensation using the integrated SHT41A-AD1B humidity-temperature sensor, achieving AEC-Q100 Grade 2 automotive compliance for battery thermal runaway detection. A hydrogen sensor is a gas detector that measures the concentration of H2 molecules in the surrounding atmosphere. Hydrogen is odorless, colorless, and highly flammable, making early detection critical in electric vehicle battery packs and hydrogen storage systems. The STC42A belongs to the broader hierarchy of gas sensors within the semiconductor sensor family, positioned alongside humidity, temperature, and particulate-matter sensors from Sensirion's automotive product line. Key features include the thermal conductivity measurement principle, which provides superior repeatability and long-term stability compared with electrochemical or catalytic bead alternatives. The sensor supports continuous measurement mode at 1 Hz and a low-power mode consuming less than 7 uA at 0.03 Hz sampling, enabling always-on battery monitoring. AEC-Q100 Grade 2 qualification makes it suitable for harsh automotive environments, and autonomous humidity compensation removes the need for external compensation algorithms. Technically, the STC42A exploits the high thermal conductivity of hydrogen relative to air: a heated sensing element loses heat proportionally to H2 concentration, and the on-chip signal conditioning converts this into a calibrated digital output over I2C. The co-packaged SHT41A-AD1B provides real-time relative humidity and temperature data that the sensor uses internally to correct cross-sensitivities, ensuring accuracy across varying environmental conditions. Typical applications include lithium-ion battery thermal runaway early detection in electric vehicles, hydrogen leakage monitoring in fuel-cell vehicles and hydrogen infrastructure, and thermal propagation warning systems where early H2 detection precedes smoke or fire. When integrating the STC42A, place the sensor where hydrogen accumulates first, typically near the top of the battery enclosure, since hydrogen rises rapidly. Ensure the I2C bus uses appropriate pull-up resistors and follow Sensirion's integration guidelines for airflow. This page synthesizes distributor pricing context, evaluation-kit options, drop-in variant information, and practical design notes not found in the manufacturer datasheet.
STTS751 - 1.8V to 3.6V Digital Temperature Sensor | STMicroelectronics
The STTS751 is a low-voltage, digital temperature sensor from STMicroelectronics that provides high-accuracy temperature monitoring with an I2C/SMBus serial interface. It operates from a supply voltage range of 1.8V to 3.6V and is available in a compact 6-pin UDFN package (2x2 mm). The device measures temperature with a typical accuracy of ±1°C (from +75°C to +95°C) and offers a programmable resolution from 9 to 12 bits, allowing designers to trade off conversion time versus resolution. A digital temperature sensor is an integrated circuit that converts ambient temperature into a digital output, typically using an internal bandgap reference and an analog-to-digital converter (ADC). It belongs to the broader category of temperature sensors, which are essential in thermal management systems for monitoring and protecting electronic components. Digital temperature sensors like the STTS751 are preferred over analog sensors (e.g., thermistors) because they provide direct digital readout, eliminate the need for calibration, and can be easily interfaced with microcontrollers via standard communication protocols such as I2C or SMBus. Key features of the STTS751 include a programmable resolution (9 to 12 bits), an SMBus-compatible interface with up to 400 kHz clock frequency, and a standby current of only 3.5 µA (typical) to extend battery life in portable applications. The device also supports a one-shot mode for single temperature readings, which reduces power consumption further. The operating temperature range is -40°C to +125°C, making it suitable for a wide range of environments. The STTS751 uses a sigma-delta ADC architecture to achieve high accuracy and low noise. It includes an on-chip oscillator and a digital comparator that can generate an interrupt (ALERT) when the temperature exceeds programmable high or low limits. The device also features a shutdown mode that reduces current consumption to 0.5 µA (typical), ideal for power-sensitive designs. Typical applications include system thermal management in laptops, servers, and industrial controllers; battery temperature monitoring in smartphones and tablets; and environmental monitoring in IoT devices. The small UDFN package and low power consumption make it an excellent choice for space-constrained, battery-powered designs. When designing with the STTS751, ensure proper PCB layout to minimize thermal coupling from other heat sources. Place the sensor away from power components and provide adequate copper pour for heat dissipation. The I2C address is set by the ADD0 pin, allowing up to two devices on the same bus.
TC1047AVNBTR - Analog Temp Sensor 10mV/°C SOT-23-3 | Microchip
The Microchip Technology TC1047AVNBTR is a precision analog output temperature sensor that converts local temperature to a linear voltage proportional to °C, housed in a 3-pin SOT-23B package with a 10 mV/°C output slope and -40°C to +125°C measurement range. It operates from 2.5 V to 5.5 V supply, draws 35 µA typical operating current, and delivers ±2 °C maximum accuracy at +25 °C. An analog temperature sensor IC is a semiconductor device whose output voltage (or current) varies linearly with on-die temperature, enabling direct ADC readout by a microcontroller or comparator without requiring firmware-side linearization tables. This class of sensor belongs to the broader family of temperature sensors (local vs. remote), which in turn sits under the sensors hierarchy that ultimately maps onto signal-chain and power-management blocks in mixed-signal systems. Key features of the TC1047AVNBTR include a calibrated 10 mV/°C slope, 100 mV typical output at -40 °C, 500 mV at 0 °C, 750 mV at +25 °C and 1.75 V at +125 °C, an industry-standard 3-pin SOT-23B footprint, low 35 µA quiescent current, and automotive-grade temperature range. The high-impedance output stage simplifies ADC interfacing and supports low-power duty-cycled measurements. The device uses a bandgap-core PTAT (proportional-to-absolute-temperature) architecture that produces a linear mV/°C response across the full -40 °C to +125 °C span, eliminating the piecewise correction needed by thermistor or thermocouple solutions. The internal curvature correction and factory trimming hold ±2 °C maximum error at +25 °C, with predictable drift across the operating range. Typical applications include microcontroller thermal monitoring, battery-pack overtemperature protection, HVAC thermometry, and industrial process control where a ratiometric or single-ended analog signal feeds an MCU ADC. The simple three-pin interface also suits handheld and portable instruments. When designing with this part, place a 0.1 µF decoupling capacitor close to VDD and ensure the ADC input has adequate input impedance to avoid loading the high-impedance sensor output. The wide 2.5 V to 5.5 V supply range permits direct connection to 3.3 V or 5 V rails. This page synthesizes Microchip datasheet specifications, distributor pricing from LCSC and DigiKey, SOT-23B drop-in alternatives, and practical design notes for fast BOM validation.
TCA505BG - 40V Inductive Proximity Switch IC | Infineon
The Infineon TCA505BG is a bipolar monolithic integrated circuit designed for inductive proximity switches with integrated short-circuit and overload protection, supplied in a 16-pin PG-DSO-16-1 (SOIC-16, 3.90 mm body width) surface-mount package. The device operates from a wide 4 V to 40 V supply rail and consumes less than 0.8 mA quiescent current, making it well suited to industrial 24 V sensor loops. It integrates an LC-oscillator frontend, demodulator, and threshold switch, plus a 60 mA push-pull/push-pull-tri-state output stage capable of directly driving the load or an opto-coupler to a PLC. An inductive proximity switch is a non-contact position sensor widely used in industrial automation, where an LC tank oscillation is damped when a metallic target approaches the sensing coil. The TCA505BG replaces the discrete oscillator/detector/threshold chain with a single analog mixed-signal IC, easing EMC immunity design and reducing board area in 3-wire (PNP or NPN) and 2-wire sensor heads. As a Proximity Detector IC with analog input and analog output, the part belongs to the broader sensor interface IC category (sensor conditioning -> sensor interface IC -> mixed-signal IC -> semiconductor). Key features include short-circuit and overload protection of both output stages and the external load, a 40 V maximum supply rating with reverse polarity tolerance of -40 V on the supply pin, an integrated 5 kHz oscillator, and a response frequency up to 5 kHz. The output stage can be configured for PNP (source), NPN (sink), or tri-state switching via a single MODE pin, eliminating the need for separate catalog variants. Operating temperature covers the harsh industrial range of -40 C to +110 C, suiting outdoor panel mounting, mobile hydraulics, and conveyor controls. The IC uses a bipolar process with on-chip temperature compensation and watchdog blocks that continuously monitor the supply rail and output current. Threshold hysteresis is fixed internally, removing the typical external RC network and improving switching repeatability across the operating temperature range. Typical applications include 3-wire PNP/NPN inductive proximity sensors in factory automation, machine tool position feedback, automotive sensor modules, and conveyor/object detection on 24 V industrial power buses. It is also used in harsh-environment limit switches where integrated short-circuit and reverse-polarity protection reduce warranty returns. Designers should add a free-wheeling protection diode to the output when driving inductive loads, route the LC coil as a tight differential pair to the OSC pins, and place the supply bypass capacitor within 5 mm of VCC. Compared to earlier Siemens/Infineon proximity ICs, the TCA505BG removes the external trim resistors and adds active short-circuit protection. This page consolidates distributor pricing, drop-in alternative parts, parametric comparison, and design notes not collected in the manufacturer datasheet, accelerating BOM selection for industrial proximity-sensor designs.
TDC-GP30YD-F01 - Ultrasonic Flow Converter IC with Firmware | ScioSense
The ScioSense TDC-GP30YD-F01 is an ultrasonic flow converter IC with integrated CPU and pre-loaded flow firmware, housed in a 32-pin QFN (5x5 mm) package with exposed pad. It is designed for high-end smart water meters (R400 to R800 accuracy classes) and combines an analog front-end, a Time-to-Digital Converter (TDC), and a 32-bit CPU core on a single die. A Time-to-Digital Converter (TDC) is a mixed-signal integrated circuit that measures the time interval between two events with picosecond-class resolution. In flow and ranging applications, the TDC measures the time-of-flight difference between upstream and downstream ultrasonic pulses in a pipe. The TDC-GP30 family places that TDC, an analog front-end for piezoelectric transducers, and a programmable CPU on the same silicon, reducing external component count versus discrete TDC + op-amp + MCU solutions. Key features include an on-chip zero-cross detection comparator for accurate receive signal timing, automatic temperature compensation for offset drift, support for both 2-wire and 4-wire transducer topologies, and integrated flow-rate calculation firmware (the -F01 suffix denotes pre-loaded firmware). Per the ScioSense product page, the device consumes approximately 8.5 uA at an 8 Hz sample rate, making it suitable for battery-powered metering applications where multi-year battery life is required. The device operates from a 3.6 V supply and exposes an SPI/IO interface to a host controller or external memory. Its high-resolution time measurement (sub-nanosecond) enables R400 to R800 ultrasonic water meters per industry accuracy classes. The 32-QFN exposed-pad package provides low thermal resistance for thermally stable measurements, which is critical for accurate flow conversion across temperature. Typical applications include ultrasonic water meters (residential and commercial), ultrasonic heat meters, ultrasonic gas meters, and flow measurement modules for industrial IoT. The combination of integrated firmware and a 32-QFN footprint simplifies BOM and PCB layout. When using this IC, ensure the exposed pad is soldered to a sufficient copper area for thermal stability, since temperature drift of the analog front-end directly impacts flow accuracy. Decouple VDD with at least one 100 nF ceramic capacitor placed close to the supply pin. This page synthesizes distributor pricing, pin-compatible firmware variants, and practical flow-meter design guidance not found in the standalone datasheet.
TMD37024VC - Narrow ALS Color Proximity Sensor | ams OSRAM
The ams OSRAM TMD37024VC is a narrow ambient light sensing (ALS), color, and proximity sensor module combining 16-bit color sensing (RGBC + IR), digital ambient light sensing, and proximity detection in an extremely narrow 1.44 mm-wide OLGA-8 (8-SMD module, 1.5 x 2.9 mm) package. An ambient light and proximity sensor module is an optical semiconductor that converts incident light into digital data the host processor can act upon. Within the sensing hierarchy, the TMD37024VC belongs to optical detectors and sensors, specifically integrated photodiode arrays with on-chip ADC conversion and I2C digital interface, making it a complete optical front end rather than a bare photodiode. Key features include a 16-bit RGBC-IR color channel resolution for accurate color-temperature computation, a narrow 1.44 mm module width that enables slim bezel and edge-lit display designs, and integrated proximity detection that removes the need for a separate proximity sensor. The module integrates photodiodes, analog-to-digital conversion, and digital logic in one package, simplifying board design and reducing BOM count. Technically, the device uses segmented photodiode arrays filtered for red, green, blue, clear, and infrared response. Digital output over I2C allows the host MCU to apply compensation algorithms for flicker and light-source variation. The narrow optical aperture design supports operation behind dark glass or within display cover-glass cutouts with minimal light loss. Typical applications include smartphone and tablet display backlight dimming, automatic screen brightness in wearables and laptops, presence detection and gesture-adjacent functions in IoT devices, and color-temperature-corrected lighting control in smart-home products. A key design consideration is mechanical placement: the extremely narrow 1.44 mm form factor permits bezel-edge placement, but the optical window, air gap, and crosstalk between the IR emitter and sensor must be controlled per the manufacturer datasheet mechanical integration guidelines. This page synthesizes verified distributor pricing, drop-in alternatives from the same ams OSRAM family, design guidance, and SEO-structured FAQs not found together on the manufacturer datasheet or distributor product pages.
TMP117 - ±0.1°C 16-bit I2C Temp Sensor | TI | Medical/RTD
The Texas Instruments TMP117 is a high-accuracy, low-power digital temperature sensor delivering a 16-bit result with 0.0078°C resolution and up to ±0.1°C accuracy from -20°C to 50°C without calibration, in a 6-pin WSON (DRV) or WCSP-6 (YBGR) package. It is designed to meet ASTM E1112 and ISO 80601 requirements for electronic patient thermometers and serves as a single-chip digital alternative to PT100/PT1000 platinum RTDs. A digital temperature sensor is an IC that measures its own die temperature and outputs the value over a serial bus such as I2C or SMBus. Within the semiconductor hierarchy, the TMP117 belongs to the local digital temperature sensor family under temperature sensor ICs. Compared with analog solutions (thermistors, RTDs), it eliminates signal conditioning, ADCs, and calibration while improving linearity and system accuracy. Key features include a 1.8V to 5.5V supply range (operating from 1.7V per TI datasheet SBOS961), 3.5uA typical operating current for battery-powered designs, and a 48-bit onboard EEPROM storing configuration and temperature offset calibration. Programmable high/low limit registers drive an ALERT interrupt pin, enabling autonomous over-temperature monitoring without host polling. Technically, the TMP117 uses a bandgap-based sensing element digitized by a precision ADC. It is factory-calibrated and NIST-traceable, and supports four I2C/SMBus addresses (0x48 to 0x4B) via the ADD0 pin, so up to four devices can share one bus. Low 3.5uA consumption minimizes self-heating error, which is often the dominant accuracy limit in tiny WSON and WCSP packages. Accuracy is ±0.15°C across the extended -40°C to 125°C range. Typical applications include medical patient thermometers, wearable health monitors, cold-chain data loggers, HVAC systems, and precision instrumentation RTD replacement. Its ±0.1°C uncalibrated accuracy outperforms most competitive digital sensors such as the DS18B20 or HDC1080. Design tip: place the sensor thermally close to the measured source; per TI layout guidance, keep the decoupling capacitor within 5mm and I2C pull-up resistors at least 10mm away to minimize self-heating and noise. Prices as of 2026-08-30.
TMP20AIDCKR - +/-2.5C Analog Temp Sensor, -55 to 130C | TI
The Texas Instruments TMP20AIDCKR is a CMOS precision analog-output temperature sensor in a 5-pin SOT-SC70 (DCK) package, operating from -55C to +130C with +/-2.5C accuracy and a linear transfer function of -11.77 mV/C. The device runs on a 2.7 V to 5.5 V supply with only 4 uA quiescent current, and supports operation as low as 1.8 V for temperatures between 15C and 130C. The tiny SOT-563 / SC-70-5 footprint makes it ideal for space-constrained designs. An analog temperature sensor is a semiconductor device whose output voltage (or current) varies linearly with the die temperature, allowing a microcontroller ADC to read temperature directly without requiring a specialized digital interface. The TMP20 family belongs to the broader hierarchy of temperature sensor -> thermal management sensor -> sensor IC -> semiconductor. Compared with digital-output sensors (I2C/SPI), analog sensors eliminate firmware, protocol overhead, and pull-up resistors - they are typically preferred when the host MCU lacks free I2C buses, when a simple threshold comparator trip is sufficient, or when continuous analog proportional control is required. Key features include a low 4 uA supply current that supports battery-powered and energy-harvesting applications, a wide operating range of -55C to +130C, and a slope of -11.77 mV/C (negative coefficient, meaning output voltage decreases as temperature rises). The device also offers +/-0.5C typical accuracy at 30C and +/-2.5C maximum accuracy across the full range, low self-heating due to the very low quiescent current, and 5-lead SC-70 (DCK) packaging for low-profile PCB assemblies. The TMP20AIDCKR uses a precision bandgap reference and on-chip bipolar transistors in a proportional-to-absolute-temperature (PTAT) topology to produce the linear -11.77 mV/C output. This architecture provides superior noise rejection from the supply rail and enables predictable ADC conversion at the host MCU, since each ADC LSB corresponds to a known temperature increment based on the slope and ADC reference. Typical applications include portable and battery-powered devices, HVAC thermistor replacement, environmental monitoring, and thermal protection of power components. The wide operating range and low quiescent current suit both consumer thermometers and industrial cold-chain loggers. When designing with this part, place the decoupling capacitor as close as possible to the V+ pin and route the analog output trace away from switching nodes. Because the slope is negative and the output voltage at 25C is 1.315 V (typical), designers should account for the polarity in firmware linearization tables. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical analog-sensor design notes not found in the standalone manufacturer datasheet.
TMP411 - ±1°C Remote & Local Temp Sensor | Texas Instruments
The Texas Instruments TMP411 is a dual-channel digital temperature sensor that combines a local die-temperature measurement channel with a remote temperature sensing channel in a single VSSOP-8, SOIC-8, or SOT23-8 package. It is two-wire and SMBus interface-compatible and is specified over a temperature range of -40°C to 125°C. The remote temperature sensor uses diode-connected transistors, typically low-cost NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or FPGAs. Remote accuracy is ±1°C for multiple device manufacturers, with no calibration needed. A temperature sensor is a device that measures temperature and converts it into an electrical signal. The TMP411 is a digital temperature sensor, which means it outputs temperature readings in a digital format over a serial interface, making it easy to interface with microcontrollers and digital systems. It falls under the category of temperature sensors, which are part of the broader sensor family used in various electronic systems for monitoring and control. Key features of the TMP411 include N-factor and series resistance correction, which improve remote sensing accuracy by compensating for non-idealities in the remote diode. It also features programmable temperature limits and an SMBus-compatible interface. The device operates from a supply voltage of 2.7V to 5.5V and has a resolution of 11 bits for both local and remote channels. The TMP411 uses a delta-sigma ADC to convert the analog temperature signals to digital. It includes multiple registers for configuration and temperature data storage. The N-factor correction allows the device to be used with a wide variety of remote diodes, while series resistance correction compensates for resistance in the PCB traces, ensuring accurate readings even with long traces. Typical applications include system thermal management in computers, servers, and industrial equipment, as well as environmental monitoring and battery management. The TMP411 is ideal for applications where accurate remote temperature sensing is required, such as monitoring the temperature of CPUs, GPUs, or other hot components. When designing with the TMP411, ensure proper PCB layout to minimize noise on the remote sensing lines. Use a filter capacitor on the D+ and D- lines to reduce noise. Also, consider the supply voltage and ensure it is within the specified range for reliable operation.
TMP411-Q1 - ±1°C Remote/Local Temp Sensor | Texas Instruments
The Texas Instruments TMP411-Q1 is an automotive-grade dual-channel digital temperature sensor combining a local die-temperature channel and a remote junction-temperature channel in a single 8-pin VSSOP (DGK) package. It operates from a 2.7V to 5.5V supply over an ambient range of -40°C to +125°C, with remote measurement up to 150°C and ±1°C remote accuracy. A temperature sensor converts thermal energy into an electrical signal for monitoring and control. The TMP411-Q1 belongs to the digital temperature sensor class, outputting 12-bit readings over an I2C/SMBus two-wire interface instead of an analog voltage. Within the thermal-management hierarchy it sits as a remote/local digital sensor monitor within the broader sensor and power-management families used across automotive, industrial, and computing platforms. Key features include programmable non-ideality (N) factor and series-resistance cancellation, which compensate for external transistor non-idealities and PCB trace resistance to preserve accuracy across the full range. Programmable resolution and threshold limits, minimum/maximum temperature monitors, diode fault detection, and a temperature alert function complete the feature set. Technically, the TMP411-Q1 uses an internal ADC to measure the voltage across a diode-connected remote transistor, typically NPN/PNP devices embedded in MCUs, MPUs, or FPGAs. N-factor correction adjusts for the ideality factor of the external transistor, while series-resistance correction cancels line-resistance error. SMBus timeout and alert-response support improve bus robustness, and low shutdown quiescent current (approximately 8 uA) suits always-on automotive nodes. Typical applications include automotive battery management systems, engine control units, infotainment processors, and CPU/GPU thermal monitoring in embedded and data-center systems, where accurate remote junction sensing directly protects performance and reliability. Design tip: keep remote-sense traces short and routed as a differential pair away from noise, configure the N-factor and series-resistance registers to match the external transistor, and use pull-ups on the open-drain I2C and alert lines. Prices shown are as of 2026-08-29.
TMP411ADGKR - ±1°C Remote/Local Temp Sensor | TI | I2C/SMBus
The Texas Instruments TMP411ADGKR is a remote and local digital temperature sensor with ±1°C remote and local accuracy, an 11-bit digital output, and a wide -40°C to +125°C operating range, housed in an 8-pin VSSOP (DGK) surface-mount package with two-wire I2C/SMBus serial interface. A remote digital temperature sensor measures temperature by sensing the junction voltage of a diode-connected transistor that is often built into a microcontroller, microprocessor, or FPGA die. Because this sensing element sits directly on the hot silicon, remote sensors like the TMP411 report die temperature far more accurately than board-level thermistors or local-only sensors. The TMP411 belongs to the temperature sensor hierarchy: temperature sensor IC -> digital temperature sensor -> remote/local digital sensor -> thermal monitoring IC within a broader system-monitoring stack. Key features include programmable non-ideality (N) factor correction, which compensates for the manufacturing variation of the remote transistor, and series resistance cancellation that removes the error caused by PCB trace resistance between the sensor and remote diode. An ALERT output flags out-of-limit temperatures, while offset registers allow one-point system calibration for even tighter accuracy. The device is pin- and register-compatible with the Analog Devices ADT7461, giving designers a proven second source. The sensor digitizes both its own local die temperature and the remote diode temperature with 11-bit resolution (0.125°C steps in extended mode), and communicates over an industry-standard two-wire SMBus/I2C bus that supports multiple slave addresses selected by the ADD pin. Fault queueing and bus-timeout detection guard against bus lock-up in noisy environments. Typical applications include CPU, GPU, and FPGA die-temperature monitoring in servers and networking equipment, thermal supervision of power supplies and base stations, and industrial automation modules requiring two independent temperature zones from one IC. In layout, keep the DXP/DXN routing symmetric and short; the series-resistance cancellation handles a few ohms of trace resistance, but excessive capacitance or noise pickup on the differential pair degrades remote accuracy. This page adds value beyond the manufacturer datasheet by synthesizing distributor pricing as of 2026-09-02, drop-in alternatives (including the ADT7461 cross-brand equivalent), and practical PCB design notes into a single engineering reference.
TMP411ADR - ±1°C Remote/Local Temp Sensor | TI | SOIC-8
The Texas Instruments TMP411ADR is a ±1°C remote and local digital temperature sensor with N-factor and series-resistance correction, an 11-bit resolution output, and an I2C/SMBus serial interface, housed in an 8-pin SOIC (D) package. It measures its own die temperature (local channel) plus an external diode-connected transistor, typically integrated in a microcontroller, microprocessor, or FPGA die, over a -40°C to +125°C sensing range from a 2.7V to 5.5V supply. A remote/local temperature sensor is a monitoring IC within the broader power-management and thermal-management hierarchy of an electronic system. Unlike a standalone thermistor or analog-output sensor, it digitizes temperature internally and reports readings over a two-wire bus, allowing a host controller to poll multiple thermal zones, trigger alerts, and throttle clocks or fans before damage occurs. Remote-junction sensing is essential because the hottest point in modern electronics is usually the silicon die itself, not the PCB surface. Key features include ±1°C remote diode accuracy, programmable non-ideality (N-factor) correction that lets the device match different processor thermal diodes, and series-resistance cancellation that removes D+/D- PCB trace resistance error. An ALERT output flags out-of-limit readings while a THERM output provides a comparator-style hot-limit signal for direct fan or shutdown control. Architecturally, the TMP411 uses a delta-sigma ADC to convert the ratio of two diode forward currents into a digital temperature code with 0.0625°C LSB (11-bit), and applies digital correction factors for beta and series resistance. Typical applications include CPU/FPGA/GPU die temperature monitoring in servers and networking equipment, thermal supervision in industrial automation, and fan-speed control loops in power supplies and base stations. Design consideration: keep D+ and D- traces short, routed as a differential pair away from switching noise, since series resistance and coupled noise directly degrade remote accuracy. This page adds value beyond the datasheet by consolidating distributor pricing, drop-in alternatives, comparison tables, and practical design notes in one place.