SI7051-A20-IMR - I2C Temperature Sensor, ±0.1°C, 6-DFN | Silicon Labs
N.º de pieza: SI7051-A20-IMR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.95 | $2,95 |
| 10 | $2.66 | $26,60 |
| 100 | $2.36 | $236,00 |
| 500 | $2.1 | $1.050,00 |
| 1.000 | $1.85 | $1.850,00 |
| 2.500 | $1.62 | $4.050,00 |
SI7051-A20-IMR Descripción general
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.
Alternativas directas para SI7051-A20-IMR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
SI7051-A20-IM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI7021-A20-IMR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TMP102AIDRLR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LM73CIMK-0/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI7051-A20-IMR Valores máximos y características eléctricas
| Tipo de sensor | Digital Temperature Sensor |
| Sensing Temperature - Local | -40°C to +125°C |
| Tipo de salida | I2C (Digital) |
| Accuracy | ±0.1°C maximum (human-body calibrated) |
| Resolución | 14-bit |
| Corriente de alimentación | Low-power CMOS, optimized for battery applications |
| Interfaz | I2C (Standard / Fast Mode) |
| I2C Address | Factory-programmable |
| Encapsulado | 6-DFN (3x3 mm) with exposed thermal pad |
| Tipo de montaje | Surface Mount |
| Rango de temperatura de funcionamiento | -40°C to +125°C |
| Estado RoHS | Compliant |
| Sensor Element | CMOS band-gap |
Configuración de pines de SI7051-A20-IMR
| Pin 1 | ADDR — I2C address selection (factory-programmable) |
| Pin 2 | ALERT — Alert / interrupt output |
| Pin 3 | GND — Ground |
| Pin 4 | SDA — I2C data (open-drain, requires external pull-up) |
| Pin 5 | SCL — I2C clock (requires external pull-up) |
| Pin 6 | VDD — Supply voltage |
Aplicaciones típicas
SI7051-A20-IMR es adecuado para 7 aplicacións: Wearable Body-Temperature Monitoring, HVAC Thermostat Control, Environmental IoT Logging, Cold-Chain Asset Tracking, Industrial Equipment Thermal Protection, Medical and Health Devices, Server and Datacenter Thermal Monitoring.
Wearable Body-Temperature Monitoring
The SI7051-A20-IMR's ±0.1°C maximum accuracy is human-body-calibrated, making it an ideal fit for wearable thermometry. Its low quiescent current extends battery life in fitness bands, smartwatches, and continuous-temperature patches. Housed in a 3x3 mm DFN-6, it fits dense wearable layouts and communicates via I2C to the host SoC on demand or at a programmed interval. Unlike analog thermistors, this part eliminates per-board calibration and frees the system ADC for other sensors. For PCB layout, place thermal vias under the exposed pad to couple the sensor die to the user's skin contact or chassis.
Recomendado
HVAC Thermostat Control
In HVAC and building-automation thermostats, the SI7051-A20-IMR delivers 14-bit temperature resolution for precise ambient room control. Its -40°C to +125°C range covers outdoor and indoor extremes, while the I2C interface simplifies wiring to a wall-mounted host controller or wireless MCU. The 3x3 mm DFN-6 footprint fits behind touch panels and small enclosures without occupying much PCB area. Compared with NTC thermistors, the SI7051-A20-IMR provides factory-calibrated accuracy that removes manual trimming steps in production. Power consumption is low enough to support battery-powered wireless thermostat transmitters that run for years on a coin cell.
Recomendado
Environmental IoT Logging
Environmental IoT nodes - whether indoor air-quality monitors, weather stations, or agricultural sensors - rely on accurate temperature for data quality. The SI7051-A20-IMR's ±0.1°C calibrated accuracy and 14-bit output allow direct ingestion into cloud telemetry without additional linearization. Low active current combined with low standby consumption makes it suitable for solar-cell or coin-cell-powered nodes that sample periodically over I2C. The DFN-6 (3x3) exposed pad provides good thermal coupling to the PCB so the sensor reads board-level temperature accurately. When deployed in weather stations, pair it with a humidity sensor on the same I2C bus for a complete environmental node.
Recomendado
Cold-Chain Asset Tracking
Cold-chain shipping and pharmaceutical logistics require temperature data logs with sufficient accuracy to detect excursions. The SI7051-A20-IMR's ±0.1°C accuracy and -40°C to +125°C range cover frozen and refrigerated conditions, while its compact 3x3 mm DFN package fits inside single-use shipment loggers. Low quiescent current extends the operating life of disposable loggers that must log every few minutes for weeks. The exposed thermal pad ensures quick settling when a shipment moves between cold storage and ambient environments. I2C interface allows easy pairing with Bluetooth or cellular modem modules in shipping tracking devices.
Recomendado
Industrial Equipment Thermal Protection
Industrial controllers, motor drives, and power converters all require temperature monitoring for thermal protection. The SI7051-A20-IMR's wide -40°C to +125°C operating range makes it suitable for inside-enclosure or heatsink-mounted sensing in industrial environments. Unlike analog sensors, its I2C digital output avoids noise pickup along long analog runs in factory cabinets. The small DFN-6 (3x3 mm) footprint allows placement directly next to hot components on the PCB. With factory calibration, design engineers can rely on ±0.1°C accuracy to derive accurate derating curves without manual compensation, ensuring reliable protection across production variability.
Recomendado
Medical and Health Devices
The SI7051-A20-IMR's ±0.1°C calibration makes it usable in clinical accessories and consumer health monitors. With factory calibration and 14-bit output (0.01°C resolution typical), the sensor provides high-resolution trending data for continuous thermometry. Its small 3x3 mm DFN-6 footprint suits disposable patches, smart thermometers, and connected health peripherals. Low operating current supports battery-powered wearables that run for days without recharging. Combined with an on-board host MCU or BLE module, the part forms the core of a connected health sensor that can stream temperature data to a phone or clinical gateway.
Recomendado
Server and Datacenter Thermal Monitoring
In server and storage systems, the SI7051-A20-IMR can serve as an accurate inlet, outlet, or hotspot temperature sensor on individual boards. Its I2C interface allows multiple devices to share a single bus with the BMC or management controller, simplifying the digital thermal mesh. The DFN-6 (3x3 mm) footprint fits between DIMM slots and PCIe card edges where space is constrained. Wide operating range covers industrial equipment specifications, and the low power does not affect total system thermal budget. When combined with high-accuracy monitoring ICs, it supports fine-grained fan-control algorithms that reduce total system energy use.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SI7051-A20-IMR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SI7051-A20-IM | SI7021-A20-IMR | TMP102AIDRLR | LM73CIMK-0/NOPB |
|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Texas Instruments | Texas Instruments |
| Package | 6-DFN (3x3) | 6-DFN (3x3) - same | 6-DFN (3x3) - same | 6-DFN (SOT-23-6 class footprint) - same | 6-DFN (SOT-23-6 class footprint) - same |
| Accuracy (max) | ±0.1°C | ±0.1°C | ±0.1°C (T), ±3% RH | ±2.0°C | ±1.0°C |
| Resolution | 14-bit | 14-bit | 14-bit | 12-bit | 11-14-bit |
| Operating Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +150°C |
| Interface | I2C | I2C | I2C | I2C | I2C/SPI |
| Channels | Temperature only | Temperature only | Temperature + Humidity | Temperature only | Temperature only |
| Pricing Tier (qty 1) | ≈USD 2.95 | ≈USD 2.85 | ≈USD 5.20 | ≈USD 1.50 | ≈USD 2.10 |
Diferenciadores clave
- ±0.1°C maximum accuracy with human-body calibration (frente a TMP102AIDRLR)
- Lower quiescent current than most digital temperature sensors (frente a TMP102AIDRLR)
- 14-bit native resolution for smoother thermal trending (frente a TMP102AIDRLR)
Notas de diseño
The DFN-6 (3x3) package has an exposed thermal pad on the bottom; for accurate ambient temperature sensing, place thermal vias connecting the pad to the inner PCB ground planes. Without this coupling, the sensor die self-heats and reads above true ambient. Estimated: at typical 1 conversion/s duty cycle, self-heating is <0.1°C if thermal vias are present, but rises to 0.5-1°C without them.
Route SDA and SCL lines away from switching nodes and high-current traces to avoid I2C bus corruption. Place 100 nF decoupling ceramic within 5 mm of the VDD pin, plus a bulk 1 uF capacitor if supply impedance varies at the sample rate. Keep signal trace lengths short - within 50 mm - to maintain signal integrity at I2C Fast Mode (400 kHz). Add ESD protection diodes if exposed to user touch (wearable / touch panels).
Do not omit the I2C pull-up resistors on SDA/SCL - the SI7051-A20-IMR has open-drain drivers that require external pull-ups to the host logic rail (typically 1.8V, 3.3V, or VDD). Also be aware that the factory-programmable I2C address means that ordering the IM vs IMR (or different batches) can yield different addresses; verify the address with the datasheet device marking table. Estimated: if the wrong address is assumed, the host sees NACK and the design will appear non-functional.
Información de cumplimiento
RoHS compliant per Alibaba / Mouser / DigiKey product listings. Halogen-free status not stated in available data - set to unknown. Not AEC-Q100 qualified; this part is intended for industrial / consumer use, not automotive safety-critical applications.
