Temperature Sensors
Products (40)
103NT-4-R025H41G - 10kΩ NTC Thermistor Glass Bead | Semitec
The Semitec 103NT-4-R025H41G is a glass-encapsulated NTC (Negative Temperature Coefficient) thermistor with a nominal resistance of 10 kΩ at 25 °C, supplied in a radial bead form factor with 25 mm insulated leads. It belongs to the Semitec NT-4 series of high-reliability glass-sealed thermistors engineered for high-temperature operation and fast thermal response, making it a preferred sensing element in medical, industrial, and scientific instrumentation. The glass encapsulation provides hermetic sealing, mechanical robustness, and chemical resistance that conventional epoxy-coated thermistors cannot match. An NTC thermistor is a type of temperature sensor whose electrical resistance falls predictably as temperature rises, following an exponential relationship characterized by its B-constant (also called B-value or B-coefficient). The B-constant of the 103NT-4-R025H41G is typically 4250 K (range), which describes how rapidly its resistance changes across the sensing range. NTC thermistors belong to the broader category of resistive temperature sensors, sitting alongside RTDs (Resistance Temperature Detectors) and thermocouples in the wider taxonomy of passive temperature transducers used in modern electronics. Key differentiating specifications of the 103NT-4-R025H41G include its 10 kΩ nominal resistance at 25 °C, a B-constant of 4250 K (typical), and a glass bead body that enables operation across a wide temperature range with rapid thermal equilibration to surrounding media. The 25 mm lead length supports through-hole mounting or custom probe assembly, while the glass envelope is resistant to moisture, solvents, and mechanical stress. From a technical-architecture perspective, the 103NT-4-R025H41G uses a sintered metal-oxide semiconductor sensing element sealed inside a hermetic glass envelope with axial Dumet-wire leads. Compared with epoxy-coated thermistors, glass encapsulation extends the operating-temperature ceiling, improves long-term drift performance, and enables use in liquid-immersion and harsh-chemical sensing. Typical applications cover medical patient monitoring probes, HVAC inlet-air sensing, 3D-printer hot-end thermal protection, laboratory water/oil bath measurement, and industrial process control loops where the glass envelope survives cleaning solvents and elevated temperatures that would degrade epoxy-coated parts. When designing with this thermistor, pair it with a precision analog front-end such as a resistor divider feeding an ADC or an op-amp-based linearization circuit, and apply the Steinhart-Hart equation for software-side temperature conversion. Use a reference resistor of 10 kΩ for a divider optimized around the sensing midpoint. This page synthesizes distributor pricing across Mouser, DigiKey, and LCSC, drop-in alternatives within the Semitec NT family, and practical design notes not consolidated in the manufacturer datasheet, providing information gain beyond stock-distributor listings.
AD595AQ - Type K Thermocouple Amplifier w/ CJC, 14-CERDIP | Analog Devices
The Analog Devices AD595AQ is a monolithic Type K thermocouple amplifier with on-chip cold-junction compensation (CJC), factory-trimmed to produce a high-level 10 mV/°C output directly from a thermocouple signal, packaged in a 14-pin CERDIP (Q) hermetic package. The part combines an ice-point reference, a precision pre-calibrated instrumentation amplifier, and a thermocouple-linearization network on a single bipolar die, eliminating the discrete cold-junction circuit, op-amp, and reference that traditional Type K designs require. According to the Analog Devices AD594/AD595 datasheet, the device operates from a single +5 V supply and supports a calibrated measurement range of 0 °C to +300 °C (Q grade). A thermocouple amplifier is a specialized analog front-end IC that conditions the microvolt-level output of a thermocouple - two dissimilar metals joined at a hot junction whose Seebeck voltage tracks temperature - and translates it into a standardized, low-impedance signal that an ADC, controller, or display can read directly. Within the signal-chain hierarchy, the AD595AQ sits between the sensor layer (the Type K probe) and the data-acquisition layer (the ADC or MCU), performing the cold-junction compensation, linearization, and amplification functions that would otherwise demand five to ten discrete components. Key features include factory-trimmed NIST Type K linearization, 10 mV/°C nominal scaling (versus the raw Type K Seebeck coefficient of roughly 41 µV/°C, an internal gain of ~244×), ±1 °C (A grade) or ±2.5 °C maximum calibration error over the rated span, pin-strappable setpoint-controller mode for switched-output thermostat operation, and an ice-point-trimmed reference accurate to ±0.05 °C/°C of board temperature drift. Internal amplifier bandwidth supports both continuous linearization and PWM-style setpoint use. Typical applications include industrial oven/ furnace profiling, HVAC duct and stack-gas monitoring, laboratory benchtop temperature instruments, and standalone Celsius transducers driving panel meters or PLC analog inputs. The hermetic 14-CERDIP package suits legacy military/aerospace systems, downhole oil/gas tools, and other environments where plastic SOIC moisture absorption is unacceptable. Note that ADI now classifies the AD595 as "NOT RECOMMENDED FOR NEW DESIGNS," so the AD595AQ is best suited to existing designs, repair stock, or replacement of obsolete industrial boards. When designing with the AD595AQ, bypass +VS to ground with 0.1 µF ceramic as close to the IC as possible, connect the thermocouple inputs with twisted-pair or shielded wire routed away from switching noise, and remember that the on-chip compensation only addresses the board-side cold junction - any heat conducted down the probe wires will still introduce error. The Q grade is calibrated for 0-300 °C; for higher ranges the C grade (0-1000 °C) is a drop-in alternative. This page synthesizes distributor pricing, drop-in ADI same-package alternatives, and practical design notes beyond what the manufacturer datasheet alone provides, helping engineers source, substitute, and integrate the AD595AQ with confidence.
AD7314ARMZ - 10-Bit Digital Temp Sensor SPI | Analog Devices
The AD7314ARMZ from Analog Devices is a complete temperature monitoring system in an 8-lead MSOP (uSOIC) package. It integrates a bandgap temperature sensor and a 10-bit successive-approximation ADC to digitize temperature with 0.25 degree C resolution, an accuracy of +/-2 degree C, and an operating range of -35 degree C to +85 degree C. A digital temperature sensor is an integrated circuit that converts ambient temperature into a digital output using an internal sensing element and an analog-to-digital converter. These devices sit within the broader temperature sensor family alongside analog-output and thermistor solutions, and they form the sensing layer of thermal management, system protection, and performance-optimization subsystems in industrial, networking, and consumer electronics. Key features include a wide 2.65V to 5.5V supply range, an SPI/QSPI/MICRO-WIRE compatible serial interface for direct microcontroller connection, a shutdown mode for battery-powered designs, and an ID pin with internal 1k ohm pull-down that lets a host distinguish multiple devices on a shared bus. The 10-bit output yields 0.25 degree C steps, sufficient for fan control and over-temperature throttling loops. Architecturally, the bandgap sensor produces a voltage proportional to die temperature, which the on-chip SAR ADC converts on demand under host control. Read and write operations over the flexible serial interface allow configuration and data retrieval, while shutdown cuts quiescent current between conversions, conserving energy in portable and embedded systems. Typical applications include thermal management in servers and networking equipment, temperature monitoring in industrial controllers, and environmental sensing in consumer and portable electronics. Low voltage operation and the compact MSOP footprint suit space-constrained PCBs. Design tip: decouple VDD with a 0.1uF ceramic capacitor close to the pin and keep thermal paths short for accurate die-to-ambient tracking. Use the ID pin carefully to avoid bus contention in multi-device systems.
AD7314ARMZ-REEL7 - 10-Bit Digital Temp Sensor | Analog Devices
The AD7314ARMZ-REEL7 from Analog Devices is a complete temperature monitoring system in an 8-pin uSOIC (MSOP) package. It integrates a bandgap temperature sensor and a 10-bit ADC to digitize temperature readings with a resolution of 0.25C. The device operates over a temperature range of -35C to +85C and supports a supply voltage from 2.65V to 5.5V. Its flexible serial interface allows easy connection to most microcontrollers, making it ideal for space-constrained applications. 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. In the hierarchy of temperature sensing, the AD7314 is a local digital temperature sensor, part of the broader temperature sensor family. Unlike analog sensors that output a voltage or current proportional to temperature, digital sensors provide a direct digital reading, simplifying interface design and improving noise immunity. Key features include 10-bit resolution with 0.25C LSB, a wide supply range of 2.65V to 5.5V, and low power consumption suitable for battery-powered devices. The serial interface is SPI/QSPI/MICROWIRE compatible, and the device includes a shutdown mode for power saving. The 8-lead MSOP package measures approximately 3mm x 3mm, ideal for portable and space-limited designs. Technically, the AD7314 uses a bandgap temperature sensor producing a voltage proportional to absolute temperature, digitized by a successive-approximation ADC. The device guarantees accuracy of plus or minus 2C over the full temperature range per the ADI datasheet. A power-on reset ensures valid output immediately after power-up. Typical applications include temperature monitoring in portable electronics, battery management systems, industrial process control, environmental sensing, and medical devices. Its small footprint and low power suit wearable devices and IoT nodes. When designing with the AD7314, ensure the supply voltage stays within the specified range and the SPI lines are properly terminated. No external calibration is required, but use adequate supply decoupling (0.1uF ceramic close to the VDD pin) for optimal performance.
CA+ - DS75S-CA+ Digital Temperature Sensor 11b | Analog Devices
The Analog Devices (formerly Maxim Integrated) DS75S-CA+ is a digital temperature sensor with a 9-bit to 12-bit (factory-default 11-bit) user-configurable resolution, an I2C/SMBus-compatible serial interface, and an operating range of -55 °C to +125 °C, packaged in an 8-pin SOIC (S) with the automotive-grade CA+ finish. The CA+ suffix is the vendor’s automotive/extended-quality screening designation applied on top of the base DS75S+ part, indicating the part meets stricter quality and reliability screening beyond the standard commercial grade. A digital temperature sensor is an IC that combines an on-chip bandgap or silicon-junction temperature transducer with an analog-to-digital converter (ADC) and a digital serial interface (commonly I2C, SMBus, or SPI). The sensor periodically samples die temperature, converts it to a calibrated digital word, and exposes the result over the bus, eliminating the need for external ADCs, op-amps, and linearization firmware. These devices sit in the hierarchy: temperature sensor → sensor IC → analog/mixed-signal IC → semiconductor, and they are widely used to replace discrete thermistors and thermocouples in system thermal-management designs. Key features of the DS75S-CA+ include ±2 °C (max) accuracy from -25 °C to +100 °C, ±3 °C accuracy over the full -55 °C to +125 °C range, a 2.7 V to 5.5 V supply range, an I2C/SMBus 2-wire interface supporting 9-bit to 12-bit resolution (with 11-bit factory default), three address pins allowing up to 8 devices on one bus, an overtemperature alarm output (O.S. pin) with user-programmable trip points, and a low 0.5 mA (typ) active supply current plus shutdown mode. The 8-pin SOIC footprint is hand-solder-friendly and compatible with virtually all 8-SOIC land patterns. Internally, the DS75S-CA+ uses an on-die bipolar-junction transducer whose delta-Vbe is digitized by a sigma-delta ADC and corrected in firmware by factory-trimmed coefficients stored in on-chip EEPROM. Each I2C transaction returns a signed two’s-complement temperature word; an integrated thermostat function compares the measurement against a programmable TOS/THYST window and asserts the open-drain O.S. pin to interrupt a host microcontroller without polling. Typical applications include automotive climate-control modules, server and networking thermal monitoring, white-goods and HVAC controllers, battery-pack thermal protection, and any embedded system that needs a board-level digital thermal alarm. The wide supply range (2.7 V to 5.5 V) and rugged -55 °C to +125 °C operating range make it equally suited to industrial and automotive environments. When designing with the DS75S-CA+, place a 0.1 µF decoupling capacitor within 5 mm of VDD and a 10 kΩ pull-up on the open-drain O.S. and SDA/SCL lines. Note that the CA+ suffix denotes extended-quality screening on top of the standard DS75S+ part; engineers verifying against the official datasheet should consult the device-specific ordering information table. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
DS18B20+ - 1-Wire Digital Thermometer, 9-12 bit, TO-92-3 | Maxim
The Maxim Integrated (Analog Devices) DS18B20+ is a 1-Wire digital thermometer providing programmable 9-bit to 12-bit Celsius temperature measurements with nonvolatile user-programmable upper and lower alarm trigger points, housed in a 3-pin TO-92-3 package. The part features a measurement range of -55C to +125C with +/-0.5C accuracy from -10C to +85C and a maximum 750 ms conversion time at 12-bit resolution. A digital temperature sensor is an integrated transducer that converts a physical temperature into a calibrated digital word via an on-die bandgap reference, sigma-delta ADC, and serial protocol engine. The DS18B20 sits in the product taxonomy of: temperature sensor -> digital temperature sensor -> thermal sensor -> sensor IC -> semiconductor. It uses Maxim's 1-Wire protocol, a single-wire half-duplex serial bus that requires only one data line plus ground for communication with a host microcontroller, and supports multi-drop networking of many DS18B20 devices on the same wire through unique 64-bit ROM IDs. Key features include an operating voltage range of 3.0 V to 5.5 V (external power mode) or 3.0 V to 5.5 V with parasite-power support derived from the data line, four programmable resolution steps (9, 10, 11, 12 bit corresponding to 0.5C, 0.25C, 0.125C, 0.0625C LSB), and on-die EEPROM that retains user alarm thresholds across power cycles. The TO-92-3 through-hole package simplifies breadboard and hand-wired prototype use, while the SO-8 and uSOP variants (DS18B20Z, DS18B20U) target surface-mount designs. The device incorporates a 64-bit factory-lasered ROM containing a unique serial number, an on-die temperature sensor with internal signal conditioning, nonvolatile EEPROM for alarm TH and TL plus configuration register, and a power-on detect circuit. The DS18B20 returns temperature as a 16-bit two's-complement value over the 1-Wire bus with strict CRC-8 protection on every transaction, eliminating bit errors in electrically noisy environments. Typical applications include HVAC environmental monitoring, building automation, server-rack cold-aisle telemetry, industrial process monitoring, and IoT weather stations. The DS18B20 is widely used in Arduino, ESP32, and Raspberry Pi projects where multiple sensors share one GPIO pin, providing low-cost, cable-friendly distributed sensing. Stainless-steel waterproof probe assemblies based on the DS18B20 are the de facto standard for liquid and soil temperature measurement. When designing with the DS18B20+, ensure the data line has a 4.7 kohm pull-up to VDD and that long cable runs use STP/UTP with ground to limit ringing; parasite-power mode requires a strong pull-up during conversion. Decouple VDD with 100 nF close to the pin in externally powered mode. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the datasheet's pin table.
LM235 - Precision Temperature Sensor | STMicroelectronics | Industrial
The LM235 is a precision integrated-circuit temperature sensor that produces an output voltage linearly proportional to the Celsius temperature. It operates over a temperature range of -40°C to +125°C and provides an output of 10 mV/°C with a typical accuracy of ±1°C at 25°C. The device is available in a TO-92 package, making it suitable for through-hole mounting in a wide range of applications. A temperature sensor is a device that converts thermal energy into an electrical signal, typically a voltage or current, that can be measured and processed. The LM235 belongs to the family of analog temperature sensors, which are widely used in environmental monitoring, industrial control, and consumer electronics. These sensors are essential in systems that require temperature compensation, thermal protection, or precise temperature measurement. Key features of the LM235 include a wide operating voltage range of 4V to 30V, low self-heating of 0.1°C in still air, and a linear output of 10 mV/°C. The device also features a typical accuracy of ±1°C at 25°C and ±2°C over the full temperature range. Its low output impedance and ability to drive capacitive loads make it easy to interface with analog-to-digital converters (ADCs) and microcontrollers. The LM235 uses a bandgap reference circuit to generate a voltage proportional to temperature, ensuring stable and repeatable performance. The output voltage is calibrated at the factory, eliminating the need for external trimming in most applications. The device operates from a single supply and can be used in both single-ended and differential configurations. Typical applications include temperature monitoring in industrial process control, thermal management in power supplies, battery temperature sensing in portable devices, and environmental monitoring in HVAC systems. The LM235 is also used in automotive applications for engine temperature sensing and cabin climate control. When designing with the LM235, ensure that the supply voltage is within the specified range and that the output is properly buffered if driving a low-impedance load. The device's low self-heating minimizes measurement errors, but for high-accuracy applications, consider using a heat sink or mounting the sensor away from heat sources.
LM26CIM5X-YPE/NOPB - ±3°C Factory Preset Thermostat | Texas Instruments
The LM26CIM5X-YPE/NOPB is a precision, single digital-output, low-power thermostat from Texas Instruments, part of the LM26 family. It integrates an internal reference, DAC, temperature sensor, and comparator in a compact SOT-23-5 (DBV) package. This device features a factory-preset trip point of 115°C and provides an active-low, open-drain digital output, making it ideal for over-temperature protection in a wide range of systems. Operating from a 2.7V to 5.5V supply, it draws minimal quiescent current, ensuring low power consumption in battery-powered applications. A thermostat is a temperature switch that triggers a digital output when the temperature crosses a preset threshold. The LM26 is a solid-state thermostat, meaning it uses semiconductor sensing rather than mechanical contacts, offering higher reliability and faster response. It belongs to the temperature sensor hierarchy: thermostat -> temperature switch -> temperature sensor -> sensor -> electronic component. This device is specifically the LM26NV variant, which omits the analog VTEMP output, focusing solely on digital trip functionality. Key features include ±3°C accuracy over the full operating range, a fixed trip point of 115°C, and an active-low open-drain output that can sink current to drive external loads or interface with logic. The device also includes a built-in hysteresis of 10°C (typical) to prevent output oscillation. The SOT-23-5 package is lead-free and RoHS compliant, suitable for surface-mount assembly. Technically, the LM26 uses a bandgap reference and a DAC to set the trip point, with a comparator that monitors the temperature sensor output. The open-drain output requires an external pull-up resistor, typically 10kΩ, to define the logic-high level. The device operates over a temperature range of -55°C to 125°C, making it suitable for harsh environments. Its low supply current of 40µA (typical) ensures minimal thermal self-heating, preserving accuracy. Typical applications include over-temperature protection for power supplies, battery chargers, motor controllers, and industrial equipment. The 115°C trip point is well-suited for protecting components that must not exceed this temperature, such as power transistors and voltage regulators. The small footprint and low cost make it ideal for high-volume consumer and automotive electronics. When designing with this device, ensure the open-drain output is properly pulled up and that the supply voltage is decoupled with a 0.1µF ceramic capacitor close to the V+ pin. The thermal path to the PCB should be optimized to ensure accurate sensing of the target component's temperature.
LM63CIMA - Remote Diode Temp Sensor & Fan Control | TI SOIC-8
The Texas Instruments LM63CIMA is a ±1°C/±3°C accurate remote diode digital temperature sensor with integrated PWM fan control, housed in an 8-pin SOIC package. It accurately measures its own die temperature (local channel) and the temperature of a diode-connected transistor such as a 2N3904 or the thermal diode commonly embedded in CPUs, GPUs, and ASICs (remote channel), with a measurement range of 0°C to 125°C and a supply range of 3.0V to 3.6V. The SMBus/2-wire compatible interface delivers 8-bit (sign + 10-bit) signed temperature data and exposes tachometer input plus PWM fan-control output. A remote diode digital temperature sensor is a class of thermal-management IC that converts the temperature-dependent Vbe of a small-signal transistor into a digital reading via an on-chip ADC. In the broader power-management hierarchy these ICs sit alongside fan drivers, hot-swap controllers, and hardware monitors, enabling closed-loop thermal regulation in systems where overheating degrades reliability. Unlike thermistors or thermocouples, remote-diode sensors provide noise-immune digital output and factory-trimmed calibration, which simplifies firmware development on the chip. Key features include ±1°C local accuracy and ±3°C remote accuracy (typical), factory-calibrated series-resistance correction, a 10-bit-plus-sign remote-diode temperature ADC with 0.25°C LSB resolution, a TACH input for closed-loop fan-speed feedback, and a PWM output whose duty-cycle to support both low-frequency and high-frequency fans. The device also integrates a digital over-temperature alarm with ALERT pin interrupt, an SMBus ALERT-response address, and an offset register for system-level error trimming. The 8-pin SOIC (DIMA) package and SMBus interface allow direct drop-in upgrade of legacy LM63 designs. Architecturally, the LM63 uses a delta-Vbe sensing front-end, an integrating ADC with chopper-stabilized offset cancellation, and a state machine that handles SMBus transactions and PWM pulse-width calculation in hardware. The remote channel supports series-resistance cancellation up to a few hundred ohms of trace resistance, allowing flexible PCB routing between the IC and the sense diode. An on-chip digital filter suppresses spurious readings caused by PWM edge noise. Typical applications include processor and chipset thermal monitoring in desktop and server motherboards, graphics-card GPU thermal management, embedded-system fan-speed control, set-top-boxed and projector lamp-cooling control, and industrial chassis-temperature regulation. Designers can create boards based on TI's LM63 EVM reference schematic, which shows the recommended 2N3904 diode-connection topology, bypass-cap placement, and PWM low-pass network. When designing with this device, place the 0.1 µF VDD bypass capacitor within a few millimeters of the supply pin and use a 10 kΩ NTC bypass resistor at the D+/D- pins when the diode is omitted. Program the PWM output frequency to match the fan's tachometer gearing, and use the ALERT instruction to drive an interrupt for hot-swap events.
LM63CIMA/NOPB - Remote Diode Temp Sensor with Fan Control | Texas Instruments
The Texas Instruments LM63CIMA/NOPB is a digital temperature sensor with integrated fan control, housed in an 8-pin SOIC (D) package. It features a 2-wire SMBus serial interface, measures its own die temperature (0°C to +125°C) plus an external remote diode temperature with ±1°C accuracy, and provides a PWM output for direct fan-speed regulation. A remote-diode digital temperature sensor is a device that converts the base-emitter junction voltage of a thermally-coupled transistor or diode-connected semiconductor into a digital temperature reading. Within the broader sensor hierarchy, this places the LM63 in the category of digital thermal monitoring ICs used in power management and thermal management subsystems of PCs, servers, graphics cards, and embedded SoCs. By combining both a local and a remote channel into a single IC, the part eliminates the need for a separate thermistor circuit, reducing BOM cost and PCB area while improving measurement accuracy. Key features include ±1°C remote-diode accuracy (factory trimmed for series-resistance cancellation when paired with a 2N3904 NPN or processor substrate diode), ±3°C local sensor accuracy, 8-bit plus sign-bit resolution (0.5°C/LSB), and a programmable PWM output whose duty cycle is derived from the remote-channel temperature. The 2-wire SMBus interface operates up to 400 kHz and supports SMbus alert (SMBALERT) and T_CRIT/T_HIGH limits for hardware-controlled shutdown. The LM63 integrates a Sigma-Delta ADC front-end optimized for diode Vbe measurements, and includes TruTherm technology that compensates for series resistance between the sensor and the thermal diode. The output PWM frequency is user-selectable (programmed via SMBus), enabling compatibility with 3-wire and 4-wire fan implementations. Operating from 3.0 V to 3.6 V, the device typically consumes 1.1 mA in active conversion and offers a low-current standby mode. Typical applications include CPU/GPU thermal management on desktops, workstations, and embedded single-board computers; ASIC/FPGA chassis monitoring; and industrial-grade fan-speed control loops. The remote diode can be tied directly to a substrate thermal diode embedded in modern processors, graphics chips, or ASICs, providing accurate core-temperature reporting without discrete thermistors. When designing with this part, place the remote-diode traces as a differential pair with ground guarding to reject noise, and keep the trace length short to minimize measurement error. Verify fan drive polarity and the input range of your fan before connecting the PWM output directly to a fan tach pin.
LM63CIMAX - ±1°C Remote Diode Temp Sensor + Fan Control | TI
The Texas Instruments LM63CIMAX is a ±1°C/±3°C accurate remote-diode digital temperature sensor with integrated fan control, housed in an 8-pin SOIC (MAX) package. It measures its own internal die temperature plus the junction temperature of a remote diode-connected transistor (such as a 2N3904 or the substrate diode of a CPU/GPU/ASIC) and drives a PWM output to control a cooling fan based on programmable trip thresholds. A remote-diode temperature sensor is a class of thermal management IC that exploits the temperature-dependent base-emitter voltage of a bipolar or substrate diode to infer junction temperature far away from the sensor itself. Remote-diode sensors sit within the thermal management IC hierarchy (PMIC > thermal management > temperature sensor > remote-diode sensor) and are essential in desktop PCs, servers, and any system where a hot spot must be monitored without placing the sensor physically on the heat source. Key specifications include ±1°C remote-diode accuracy (0°C to +125°C) and ±3°C accuracy from 0°C to +85°C, 8-/10-bit-plus-sign internal/remote resolution, a 2-wire SMBus (I²C-compatible) digital interface, and a programmable PWM fan-control output with tachometer input for closed-loop RPM feedback. Supply voltage is 3.0V to 3.6V and quiescent current is roughly 1.3 mA during active conversion. The LM63CIMAX integrates a sigma-delta ADC for noise rejection, on-chip offset trim performed at the factory to minimize diode non-ideality errors, and a tachometer counter that reports fan RPM over the SMBus. The MAX package exposes a single remote-diode differential input pair (D+/D−) and the fan-driver PWM output (Fan Out), plus the digital interface pins (SDA, SCL, ALERT, GND, VDD, FAN_IN/TACH). Typical applications include CPU/GPU thermal monitoring in desktop and server motherboards, fan-speed control in telecom equipment, and chassis-intake temperature sensing in industrial controllers. The integrated fan tachometer input enables closed-loop RPM regulation rather than open-loop PWM drive, which reduces acoustic noise and extends fan life. When designing with the LM63CIMAX, keep the D+/D− routing balanced, length-matched, and surrounded by ground to cancel noise pickup that would otherwise appear as temperature noise. Decouple VDD close to the IC with a 0.1 µF ceramic capacitor and avoid routing the remote-diode traces near switching fan-drive signals to preserve accuracy.
LM63CIMAX/NOPB - SMBus Temp Sensor and Fan Controller
The Texas Instruments LM63CIMAX/NOPB is an active remote-diode digital temperature sensor with integrated fan control, local temperature sensing, and a 2-wire SMBus output in an 8-pin SOIC package. The verified manufacturer and distributor data identify the device as a fan-control and temperature-monitor IC covering 0°C to 125°C, with one remote diode temperature channel and one local temperature channel. Its remote sensing capability supports diode-connected transistors such as a 2N3904 or thermal diodes found in processors, GPUs, and other ASICs. The LM63 combines monitoring and fan-control functions, reducing the need for separate temperature sensors and fan-control logic in compact thermal-management systems. A remote-diode temperature sensor uses a semiconductor junction as a temperature-sensitive element. The LM63 measures both a remote junction and its own local temperature, then makes digital measurements available through the SMBus interface. This makes the device part of the temperature-sensor and thermal-management IC hierarchy, rather than a general-purpose analog sensor. The integrated fan-control section is intended to compare measured temperature with programmable thresholds and manage cooling in systems such as desktop computers, industrial electronics, and embedded processors. Key verified characteristics include an 8-SOIC package, a 0°C to 125°C advertised monitoring range, internal and external sensing channels, and 2-wire SMBus communication. The manufacturer describes the LM63 as factory-trimmed for series accuracy, while the exact remote-diode accuracy, fan-control thresholds, SMBus address, and electrical limits were not included in the supplied verified excerpts. Those missing values are intentionally not inferred. LCSC lists a starting price of $5.0093 as of 2026-10-08, and DigiKey and Mouser provide product, inventory, and pricing resources for current sourcing. The LM63 is appropriate when a design needs remote junction monitoring and direct fan-control integration in one device. It is especially relevant to processor, GPU, ASIC, and other high-density electronic systems where a local thermal diode is available. Compared with a simple temperature sensor, the LM63 adds fan-control functionality and SMBus digital communication. Compared with a discrete thermal-control implementation, it can reduce component count and simplify firmware access to temperature data. Designers should verify the exact package pinout, operating-voltage limits, SMBus addressing, remote-diode connection method, fan-drive ratings, and thermal accuracy against the current Texas Instruments datasheet before layout release. The remote diode should be placed close to the intended thermal region, with routing designed to minimize heat conduction and measurement error. This page synthesizes verified distributor listings, manufacturer descriptions, and design guidance without inventing missing electrical parameters.
LM75ADP - Digital Temp Sensor & Thermal Watchdog | NXP
The NXP Semiconductors LM75ADP is a digital temperature sensor and thermal watchdog with an on-chip bandgap temperature sensor and Sigma-Delta A-to-D conversion technique. Housed in an 8-pin TSSOP (SOT505-1) package, the LM75A is a pin-for-pin upgrade of the legacy LM75 with 11-bit temperature resolution (0.125 °C LSB) and operates from a single 2.8 V to 5.5 V supply. A digital temperature sensor is an IC that converts on-die thermal energy into a binary word readable by a host processor over a serial bus (typically I²C). Within the broader hierarchy, the LM75ADP sits in the sensor chain as a local-only device (no remote diode), beneath which fall thermistors, RTDs and analog temperature sensors. It functions as a thermal management building block at the board level, alongside fan controllers and supervisory circuits. The LM75A's headline features include ±2 °C accuracy over the -55 °C to +125 °C range, an I²C/SMBus-compatible interface with three selectable address pins (allowing up to eight devices on one bus), and a programmable OVERTEMP output that asserts when the measured temperature crosses a user-defined threshold. The device also integrates a configurable hysteresis register to prevent chatter around the trip point, and offers both a normal mode for periodic monitoring and a shutdown mode that drops supply current below 10 µA. Internally, the architecture pairs a precision bandgap reference with a Sigma-Delta modulator; the modulator's 1-bit stream is filtered by a decimation filter to produce the 11-bit signed result (8-bit integer plus 3-bit fraction). The OVERTEMP pin is implemented as an open-drain comparator output with the trip level and hysteresis both stored in on-chip registers, which lets the host configure thermal-window alarming in software rather than with external analog parts. Typical applications include PC/embedded system thermal monitoring, industrial controller over-temperature protection, battery-pack charge management, LCD/projector overheat shutdown, and any HVAC-style closed-loop where a low-cost, low-pin-count digital sensor is preferred over a thermistor plus ADC. Because the LM75ADP is industry-standard LM75 register-compatible, it is a frequent retrofit into LM75 sockets where higher resolution is required without firmware changes. When designing with the LM75A, observe I²C pull-up sizing: the open-drain SDA/SCL lines must be pulled to VCC through 4.7 kΩ resistors on a 3.3 V bus; the OVERTEMP pin also requires an external pull-up because it is open-drain. Decouple VCC with a 100 nF ceramic capacitor placed within 5 mm of the supply pin. This page synthesizes distributor pricing, drop-in alternatives sourced from the NXP/ADT75/TI cross-references, and practical design notes not collected in any single manufacturer datasheet.
LM75AIMX/NOPB - ±2°C Digital Temp Sensor & Thermal Watchdog, I2C, SOIC-8 | Texas Instruments
The Texas Instruments LM75AIMX/NOPB is an industry-standard digital temperature sensor and thermal watchdog with a 2-wire I2C/SMBus-compatible interface, housed in an 8-pin SOIC (D) package. It features a local temperature sensing range of -55°C to +125°C with ±2°C accuracy (max) and 9-bit (0.5°C LSB) resolution, supplied from a 2.7V to 5.5V rail. The on-chip delta-sigma ADC, bandgap reference, and over-temperature interrupt (O.S. output) make it a self-contained thermal management building block. A digital temperature sensor such as the LM75A is a mixed-signal IC that combines an on-die thermal diode, sigma-delta ADC, calibration registers, and a digital serial interface to report die temperature in a standard two's-complement format. Within the broader component taxonomy, the LM75A belongs to the local temperature sensor family, which sits under analog/mixed-signal sensors, under sensors, and ultimately under semiconductors. Compared with thermistors, the LM75A eliminates linearization math, PCB real estate, and ADC channel overhead; compared with remote-diode sensors, the LM75A sacrifices baseboard hot-spot accuracy for BOM simplicity. Key features include 9-bit (0.5°C LSB) signed two's complement output, user-programmable 9-bit O.S. (overtemperature shutdown) and Hysteresis registers, a fault-queue counter to suppress false triggers, and three selectable I2C address pins (A0/A1/A2) that allow up to eight LM75A devices on a single bus. Standby current is just 1 µA typical, and the O.S. output is an open-drain interrupt that can wire-OR multiple devices. Technically, the LM75A uses a thin-film on-die thermal element whose forward voltage is sampled by a chopper-stabilized delta-sigma ADC against an internal bandgap reference; the digital value is then stored in the 16-bit temperature register (high byte + sign/low byte). The SMBus-compatible interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes, and the part includes power-on reset and a configurable hardware shutdown mode for battery-powered designs. Typical applications include base-station equipment thermal monitoring, server and desktop PC system protection, office electronics (printers, copiers), portable battery packs, HVAC controllers, and any thermistor-replacement design. The combination of 2.7V operation, SMBus compatibility, and eight selectable addresses makes it especially attractive for multi-zone chassis monitoring in networking and industrial control. When designing with the LM75A, place the part at the actual thermal hot spot of the board and provide a low-impedance ground pour, since the die temperature is what is reported rather than ambient air. A 0.1 µF decoupling capacitor within 5 mm of VDD is recommended, and pull-up resistors on SDA, SCL, and O.S. must be sized to the bus capacitance and the chosen I2C speed. This page synthesizes current distributor pricing, drop-in replacement options, and practical PCB layout guidance not assembled in the manufacturer datasheet alone.
LM75BIMM-5/NOPB - ±2°C I2C Temp Sensor, 3V-5.5V | TI
The Texas Instruments LM75BIMM-5/NOPB is a ±2°C accuracy digital local temperature sensor with an integrated Delta-Sigma analog-to-digital converter and I2C/SMBus-compatible two-wire interface, housed in an 8-pin VSSOP (DGK) package. It operates from 3.0 V to 5.5 V, delivers 9-bit temperature data with 0.5°C resolution, and supports a measurement range of -55°C to +125°C. The device combines a bandgap reference, oversampling ADC, and a programmable over-temperature alarm with hardware OS output. A digital temperature sensor is an integrated circuit that converts on-chip thermal conditions into a calibrated digital word readable by a microcontroller. Compared with discrete NTC thermistors or RTDs, they integrate the sensor, signal conditioning, ADC, and a serial interface on one die, eliminating calibration, linearization, and external ADC circuitry. The LM75B sits inside the hierarchy: temperature sensor -> sensor IC -> analog/mixed-signal semiconductor - in short, a self-contained thermal data source for embedded systems. Key features include a factory-calibrated accuracy of ±2°C across the full -55°C to +125°C range, 0.5°C resolution (9-bit signed), a dedicated OS (overtemperature shutdown) open-drain alert pin for interrupt or comparator-style system response, and three address-select pins (A0-A2) that allow up to eight devices on a single I2C bus. Power consumption is rated at 1 mA active and 4 uA shutdown current, and the part is rated for -55°C to +125°C operation with shutdown current of 4 uA per the manufacturer datasheet. The LM75B uses a bandgap-temperature proportional core feeding a Sigma-Delta modulator to generate the digital code, achieving noise as low as 0.125°C over the 20 Hz to 100 kHz bandwidth while eliminating the need for external signal conditioning. The OS comparator and polarity-programmable INT/CMP_TSTAT pin allow hardware-based thermal protection without host intervention, reducing firmware overhead in safety-critical designs. Typical applications include thermal management in computing platforms and 1U/2U servers, system over-temperature protection in industrial controllers, portable battery-powered consumer electronics, cold-junction compensation in thermistor/RTD circuits, and general embedded system health monitoring. Designers value its ability to deliver calibrated digital data directly to a microcontroller or BMC over a two-wire bus. When designing with the LM75B, place the VSSOP-8 package close to the heat source (such as a power stage or SoC) and connect the OS pin to the host interrupt or shutdown controller for failsafe behavior. Decouple the supply with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin to meet I2C noise immunity requirements. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LMT84LPM - 1.5V 10uA Analog Temp Sensor TO-92 | TI
The Texas Instruments LMT84LPM is a precision CMOS analog output temperature sensor in a TO-92-3 through-hole package, covering -50C to +150C with a linear output of -5.5 mV/C that is inversely proportional to temperature. It operates from a supply as low as 1.5V while drawing only 5.4 uA quiescent current, making it one of the lowest-power analog temperature sensors available. An analog temperature sensor converts local temperature into a proportional voltage that a microcontroller ADC or comparator can read directly, without digital bus configuration. Within the signal chain hierarchy, it sits alongside thermistors and RTDs as a sensing element, but the LMT84 family replaces passive thermistors with a calibrated, linear, push-pull (Class-AB) output that drives heavy loads without an external buffer. Key features include +/-0.4C typical accuracy (+/-2.7C maximum), 1.5V minimum supply for single-cell battery operation, 0.7 ms power-on time enabling aggressive power-cycling, and Class-AB source/sink output capability. The inverse transfer function also provides inherent failsafe behavior: a shorted output reads as maximum temperature, which systems can detect. Architecturally, the LMT84 uses a CMOS bandgap-derived sensing core with a Class-AB output stage, giving strong output drive in both directions and low sensitivity to supply noise compared with thermistor divider circuits. Typical applications include battery-powered sensing nodes, automotive climate and battery-pack monitoring (via the AEC-Q100 Grade 0 qualified LMT84-Q1 variant), appliance and HVAC thermal protection, and portable medical devices. Design tip: because output swing is negative-sloped, remember ADC code decreases with rising temperature; at 30C the output is approximately 537 mV per the datasheet lookup table.
LMT84LPM - 1.5V Analog Temperature Sensor TO-92 | TI
The Texas Instruments LMT84LPM is a precision CMOS analog output temperature sensor in a TO-92-3 package, operating from a supply as low as 1.5V with only 5.4 uA quiescent current. It delivers a linear analog output voltage inversely proportional to temperature at a gain of -5.5 mV per degree C, spanning -50C to +150C. An analog output temperature sensor is a type of temperature sensor IC (part of the broader sensor and semiconductor hierarchy) that converts measured die temperature directly into a proportional voltage, which a microcontroller ADC can read without digital bus configuration. Unlike thermistors, analog sensors provide a linear, calibrated transfer function; unlike digital sensors such as the TMP117, they require no I2C/SMBus protocol stack. Key features include 1.5V-capable single-supply operation, 10 uA-class current consumption for effective power-cycling in battery-powered designs, a Class-AB push-pull output capable of sourcing and sinking heavy loads, 0.7 ms power-on time, and typical accuracy of plus or minus 0.4C (plus or minus 2.7C maximum) per the TI LMT84 datasheet. Architecturally, the LMT84 uses a CMOS bandgap-derived temperature-dependent voltage with an output stage that maintains linearity across the full -50C to +150C range while drawing micropower supply current, enabling years of operation from a small lithium cell. Typical applications include battery-powered environmental monitoring, HVAC thermal sensing, portable medical devices, automotive sub-systems (via the AEC-Q100 qualified LMT84-Q1 variant), and appliance over-temperature detection. Design tip: because output gain is negative (-5.5 mV/C), invert the transfer function in firmware; add a 0.1 uF bypass capacitor close to the supply pin for stable ADC readings.
MAX31855KASA+ - K-Type Thermocouple-to-Digital Converter | Maxim Integrated
The Maxim Integrated MAX31855KASA+ (now supplied by Analog Devices) is a cold-junction compensated thermocouple-to-digital converter that digitizes the signal from a K-type thermocouple and outputs the result as a signed 14-bit SPI-compatible value, all in an 8-pin SOIC (NSOIC) surface-mount package. The device resolves temperatures to 0.25 degC, accepts thermocouple readings as high as +1800 degC and as low as -270 degC, and delivers thermocouple accuracy of plus/minus 2 degC across its operating range. It integrates the cold-junction compensation sensing, ADC, digital controller, and SPI-compatible interface into a single IC, eliminating the discrete amplifier chain traditionally required for precision thermocouple signal conditioning. An integrated thermocouple-to-digital converter such as the MAX31855KASA+ belongs to the broader sensor signal-chain IC family, which sits hierarchically under temperature sensor ICs -> sensors -> analog/mixed-signal ICs -> semiconductors. By performing linearization and cold-junction compensation in hardware, the part eliminates firmware lookup tables for Seebeck-coefficient polynomial correction and lets microcontrollers consume temperature data directly over SPI, freeing CPU bandwidth for system-level tasks. Key features of the MAX31855KASA+ include 14-bit signed output resolution (plus sign bit), an SPI read-only interface with up to 4.3 MHz clock, on-chip open-thermocouple detection that flags a fault bit when the probe breaks, and a 2.7 V to 3.6 V supply range. The 8-pin NSOIC package provides low thermal mass for accurate cold-junction measurement and supports hand-solderable prototyping as well as high-volume reflow assembly. A dedicated fault register reports open thermocouple, short-to-GND, and short-to-VDD conditions in addition to the temperature data. Typical applications for the MAX31855KASA+ include industrial furnace and oven temperature monitoring, 3D-printer hot-end and bed thermistor replacement, HVAC duct sensing, automotive exhaust and engine-temperature logging, food-service and laboratory equipment, and any embedded design that previously used a MAX6675 and now needs higher resolution plus thermocouple open-detection. The wide -270 degC to +1800 degC supported span also makes it suitable for cryogenic instrumentation and high-temperature process control. When designing with the MAX31855KASA+, keep the thermocouple traces short, matched, and physically separated from switching nodes to preserve common-mode noise immunity. Place the device close to the thermocouple connector so the on-chip cold-junction sensor tracks the cold-junction temperature accurately, and add a 0.1 uF decoupling capacitor close to VDD. Unlike the MAX6675 it replaces, the MAX31855 changes SPI framing and clock polarity, so existing firmware must be updated; it is not code-compatible with the legacy part.
MAX31865ATP+ - RTD-to-Digital Converter, SPI, 20-TQFN | Maxim Integrated
The Maxim Integrated (Analog Devices) MAX31865ATP+ is a resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs), packaged in a 20-pin TQFN (5x5 mm) and specified over the -40C to +125C automotive temperature range. It integrates a precision delta-sigma ADC that converts the ratio of the RTD resistance to a reference resistance into a digital output, supports PT100 and PT1000 sensors, and accepts 2-, 3-, or 4-wire RTD topologies through configurable FORCE+, FORCE-, RTDIN+, and RTDIN- pins. The device exposes a standard SPI-compatible serial interface for host read-out and configuration, and provides integrated ±45 V input protection on the RTD/force pins to survive field fault transients. According to the Maxim datasheet, the converter achieves 0.5C initial RTD measurement accuracy (PT100, 15-bit resolution mode) and 50 Hz / 60 Hz simultaneous rejection at the ADC modulator. An RTD (Resistance Temperature Detector) is a precision temperature sensor whose resistance varies predictably with temperature, most commonly implemented as a platinum wire (PT100 = 100 ohm at 0C, PT1000 = 1000 ohm at 0C). Compared to thermocouples and silicon sensors, RTDs offer superior linearity, stability, and repeatability, making them the preferred choice for industrial process control, HVAC, medical instrumentation, and laboratory calibration. An RTD-to-digital converter such as the MAX31865ATP+ handles the excitation, ratiometric ADC conversion, linearization hint generation, and fault detection that would otherwise require a precision analog front-end, a microcontroller with calibrated lookup tables, and external protection - collapsing that workload into a single 5x5 mm IC. Key features include a 15-bit ADC resolution with selectable 50 Hz / 60 Hz notch, integrated ±45 V overvoltage protection on sensor pins, automatic RTD fault detection (open, short, and out-of-range thresholds), a low-drift on-chip reference, and a 3.0 V to 5.5 V supply range. SPI clock rates up to 5 MHz enable fast conversion read-out. The 20-TQFN package provides low thermal mass and excellent PCB thermal spreading for industrial environments. The architecture pairs a low-noise chopper-stabilized input front-end with a sigma-delta modulator, achieving effective resolution suitable for IEC 60751 Class A or AA RTD measurements. Internal calibration registers compensate for reference-resistor tolerance, and the device can be put into low-power standby between conversions to save energy in battery-powered field instruments. Combined, these features let designers achieve lab-grade temperature accuracy without external signal conditioning. Typical applications include industrial process temperature transmitters, HVAC duct and chiller sensors, medical infusion-pump and sterilizer probes, food-processing and pharmaceutical cold-chain loggers, and automotive battery-pack thermal monitoring. The ±45 V protection makes it well suited for long-cable industrial installations where induced surges are common. A key design consideration is choosing the reference resistor to match the nominal RTD resistance (typically 4.3 kohm for PT100, 4.3 kohm or 4.3 kohm parallel combinations for PT1000). The reference-resistor absolute tolerance and temperature drift set the absolute accuracy of the entire measurement chain, so a low-drift, low-TCR part (e.g. 0.1%, 10 ppm/C) is recommended. This page synthesizes distributor pricing, drop-in package alternatives, and practical design notes - including RTD wiring topologies, reference-resistor selection, and SPI timing - that go beyond the manufacturer datasheet to accelerate board bring-up.
MAX6628MTA+T - ±1°C Remote Digital Temp Sensor SPI/TDFN-8 | ADI
The Analog Devices MAX6628MTA+T is a precise digital temperature sensor that reports the temperature of a remote diode-connected transistor (typically a low-cost 2N3904 NPN) with ±1°C accuracy over the 0°C to +125°C remote range, housed in an 8-pin TDFN (3 mm × 3 mm) package. The device converts the remote-junction temperature to a 12-bit digital word and pushes it out through an SPI-compatible serial interface, allowing direct connection to most microcontrollers and microprocessors. The local die temperature is also readable, and the sensor operates from a single +3.0 V to +5.5 V supply. A digital temperature sensor IC is a mixed-signal device that uses an on-chip ADC to digitize a thermal-proportional signal (bandgap voltage, Vbe, or forward-diode Vf) and exposes the result over a serial bus such as SPI, I²C/SMBus, or 1-Wire. In the broader hierarchy, the MAX6628 sits in the temperature-sensor family, which is part of the sensor IC class, which itself belongs to the broader power management and analog signal chain category. Using an external diode as the sensing element decouples the hot spot from the ADC die, enabling accurate measurement of CPUs, FPGAs, ASICs, or power-stage heat sinks that the IC itself cannot physically reach. Key features include ±1°C remote accuracy from 0°C to +125°C, ±3°C remote accuracy from -55°C to +150°C, a 12-bit (0.0625°C LSB) temperature resolution, a 2200 pF-3300 pF recommended EMI filter capacitor between DXP and DXN, and a read-only SPI interface that simplifies firmware on microcontrollers that only need temperature data. The TDFN-8 (3×3) package is thermally efficient and footprint-compatible with standard 8-pin DFN/QFN land patterns. Typical supply current is in the hundreds of microamps, and the device includes a power-on-reset circuit that forces the first conversion to begin after supply stabilization. Architecturally, the device combines a precision current source that drives the external diode, an on-chip sigma-delta ADC that digitizes ΔVbe, a bandgap reference, calibration logic, and an SPI peripheral. The diode measurement is ratiometric and automatically compensates for series resistance and ideality factor variations when the recommended 2N3904 NPN is used. Typical applications include CPU/FPGA thermal monitoring in servers and workstations, laptop and notebook thermal management, industrial control cabinet temperature sensing, telecom base-station equipment health monitoring, and battery-pack temperature monitoring for portable and handheld systems. When designing with the MAX6628, place the 2N3904 (or equivalent) as physically close to the desired hot spot as possible, keep the PCB trace length to DXP/DXN short and matched, and add a 2200 pF capacitor between DXP and DXN to reject high-frequency EMI. Always add a local 0.1 µF decoupling capacitor adjacent to VDD. This page synthesizes distributor pricing, SPI-compatible drop-in alternatives, and practical layout notes for the MAX6628MTA+T that go beyond the manufacturer datasheet to help engineers select and qualify the part quickly.
MCP96RL00-E/MX - 8-Type Thermocouple-to-I2C Converter | Microchip
The Microchip Technology MCP96RL00-E/MX is a fully integrated thermocouple Electromotive Force (EMF) to degree Celsius converter with integrated Cold-Junction compensation, supporting 8 thermocouple types (K, J, T, N, S, E, B, R) in a 20-pin MQFN-EP (5x5 mm) package. It features ±1.5°C maximum thermocouple temperature accuracy (typical ±0.5°C after calibration), 2.7V–5.5V supply, and an I2C interface up to 100 kHz with 4 selectable addresses. An EMF-to-temperature converter is a specialized analog front-end IC that linearizes the small millivolt-level output of a thermocouple probe into a digital temperature reading, replacing discrete op-amp, ADC, reference, and lookup-table firmware with one calibrated device. Thermocouple-to-digital converters belong to the broader sensor signal-chain family, sitting between the transducer (analog sensor) and the host MCU (digital domain), and are critical building blocks in industrial, automotive, and appliance temperature monitoring systems where measurement ranges exceed what silicon sensors can reach (typically above +200°C). Key features include on-chip cold-junction compensation using an internal diode sensor, four user-programmable temperature alert outputs, programmable digital filter (minimum 1 conversion settling time), and built-in open/short thermocouple detection. The I2C address is selectable via two ADDR pins (4 addresses), and an interrupt pin (ALERT) signals threshold events. User-programmable registers configure thermocouple type, resolution, averaging, and shutdown mode for low-power applications. Architecturally, the device integrates a low-noise chopper-stabilized PGA, a high-resolution ΣΔ ADC, an internal bandgap reference, and the cold-junction sensor. Conversion results are linearized using integrated polynomial coefficients per thermocouple type and delivered over the I2C bus as both the hot-junction temperature and the cold-junction (ambient) temperature, which simplifies host firmware. Typical applications include industrial furnace and oven controllers, HVAC duct and refrigeration monitoring, 3D-printer extruder and bed temperature sensing, food-service and laboratory equipment, automotive exhaust gas temperature sensing, and battery-pack thermal management. Across these, the MCP96RL00-E/MX replaces multiple discrete components with one calibrated IC, reducing BOM cost and PCB area. Design consideration: route the thermocouple traces as a differential pair away from switching converters and heat sources to preserve the micro-volt-level EMF signal, and place the input RC filter network (per datasheet typical application) within a few millimeters of the TC+ / TC- pins to minimize noise pickup. This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design notes not consolidated on the manufacturer datasheet or any single distributor page.
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.
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.