TC1047AVNBTR - Analog Temp Sensor 10mV/°C SOT-23-3 | Microchip
MPN: TC1047AVNBTR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.75 | $7.50 |
| 100 | $0.55 | $55.00 |
| 500 | $0.42 | $210.00 |
| 1,000 | $0.32 | $320.00 |
TC1047AVNBTR Overview
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.
Drop-in alternatives for TC1047AVNBTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TC1047AVNBTR-V11
✅ Drop-In📋 Reference alternative (not in catalog)
TC1047
✅ Drop-In📋 Reference alternative (not in catalog)
TC1047AVNBTR Maximum Ratings & Electrical Characteristics
| Sensor Type | Analog, Local |
| Sensing Temperature Range | -40 °C to +125 °C |
| Output Type | Analog Voltage |
| Output Voltage Slope | 10 mV/°C (typical) |
| Output Voltage at -40 °C | 100 mV (typical) |
| Output Voltage at 0 °C | 500 mV (typical) |
| Output Voltage at +25 °C | 750 mV (typical) |
| Output Voltage at +125 °C | 1.75 V (typical) |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Supply Current (Operating) | 35 µA (typical) |
| Temperature Accuracy | ±2 °C (max) at +25 °C |
| Package | SOT-23-3 (SOT-23B) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 °C to +125 °C |
| RoHS Status | Compliant |
TC1047AVNBTR Pin Configuration
| Pin 1 | VDD — Supply voltage input (2.5 V to 5.5 V) |
| Pin 2 | GND — Ground |
| Pin 3 | VOUT — Analog output voltage proportional to temperature (10 mV/°C) |
Typical Applications
TC1047AVNBTR is suitable for 6 applications: Microcontroller Thermal Monitoring, Battery Pack Overtemperature Protection, HVAC and Thermostat Sensing, Industrial Process Monitoring, Portable Handheld Instruments, Automotive Cabin and Engine-Bay Sensing.
Microcontroller Thermal Monitoring
The TC1047AVNBTR provides a simple, low-cost temperature telemetry channel for microcontrollers and SoCs that lack an internal die-temperature sensor. Its 10 mV/°C linear output can be read directly by a 10-bit MCU ADC at 3.3 V reference, yielding ~3.2 °C per LSB without pre-amplification. The 35 µA quiescent current is small enough for always-on thermal monitoring, and the 2.5 V to 5.5 V supply range covers both 3.3 V and 5 V MCU rails. Place the SOT-23B package near the MCU or power-stage hotspot and read the ADC on demand to throttle fans, reduce clock speed, or trigger overtemperature shutdown. The wide -40 °C to +125 °C range covers industrial-grade enclosure temperatures and protects against thermal runaway in power-conversion stages.
Recommended
Battery Pack Overtemperature Protection
Lithium-ion and LiFePO4 battery management systems need a per-cell overtemperature cutoff independent of the main BMS MCU. The TC1047AVNBTR's analog output can drive a hardware comparator that opens the charge FET when temperature exceeds 60 °C, even if the firmware hangs. Its 750 mV output at +25 °C becomes 850 mV at +35 °C and 1.0 V at -35 °C, allowing simple window-comparator thresholds with a single rail-to-rail op-amp. The 2.5 V minimum supply is compatible with single-cell Li-ion packs that operate down to 3.0 V with sufficient headroom. The SOT-23B footprint is small enough to mount on the cell tab or protection PCB.
Recommended
HVAC and Thermostat Sensing
Residential and commercial HVAC thermostats need reliable indoor-air temperature sensing with low self-heating. The TC1047AVNBTR's 35 µA quiescent current contributes negligible self-heating, preserving calibration over long uptime. Its 500 mV at 0 °C output allows a thermostat MCU to read temperatures from 0 °C to 100 °C without amplifier offset, simplifying the ADC front-end. The wide supply tolerance tolerates noisy HVAC 24 VAC-derived rails after rectification. Mount the SOT-23B package inside the thermostat enclosure away from display backlight heat sources for accurate ambient readings.
Recommended
Industrial Process Monitoring
Factory automation PLCs and process controllers monitor ambient and panel-internal temperatures for predictive maintenance. The TC1047AVNBTR's industrial -40 °C to +125 °C operating range covers control cabinet environments worldwide, including outdoor enclosures in cold climates. Its 10 mV/°C slope scales predictably to PLC analog input modules designed for 0-10 V or 4-20 mA loops after signal conditioning. The ±2 °C accuracy at +25 °C is adequate for cabinet-ventilation control where ±3 °C dead-band is acceptable. Designers can connect multiple TC1047AVNBTR units to a multi-channel ADC to monitor multiple zones in a panel.
Recommended
Portable Handheld Instruments
Battery-powered handheld multimeters, environmental meters, and medical instruments need compact, low-thermal-mass sensors. The TC1047AVNBTR's SOT-23B 3-pin package occupies only 2.9 mm × 1.6 mm board area, leaving room for displays and buttons. Its 2.5 V minimum supply supports a single Li-ion cell discharged to 3.0 V without boost conversion, improving overall efficiency. The 35 µA quiescent current is small compared to the display and ADC of typical handheld designs, adding less than 1 % to total battery drain. The 750 mV at +25 °C output provides convenient mid-rail bias for unipolar ADCs.
Recommended
Automotive Cabin and Engine-Bay Sensing
Automotive climate control and engine-bay monitoring require sensors that survive -40 °C cold-start and +125 °C under-hood temperatures. The TC1047AVNBTR's wide operating range and small SOT-23B package fit both cabin HVAC modules and sealed engine-bay sensor pods. Its analog 10 mV/°C slope interfaces directly to automotive MCU ADCs that digitize temperature for HVAC blending and overheat warnings. The Microchip TC1047A datasheet confirms RoHS-compatible Pb-free reflow profiles and ±2 °C accuracy at +25 °C, suitable for cabin comfort control. For AEC-Q100-grade requirements, choose the automotive-qualified TC1047A variant.
Recommended
Recommended Products Summary
Engineering reference data for TC1047AVNBTR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TC1047AVNBTR-V11 | TC1047 |
|---|---|---|---|
| Package | SOT-23-3 (SOT-23B) | SOT-23-3 (SOT-23B) - same | SOT-23-3 (SOT-23B) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Output Slope | 10 mV/°C | 10 mV/°C | 10 mV/°C |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Quiescent Current | 35 µA typical | 35 µA typical | 35 µA typical |
| Accuracy at +25 °C | ±2 °C max | ±2 °C max | ±3 °C max |
| Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Output Voltage at +25 °C | 750 mV | 750 mV | 750 mV |
Key Differentiators
- Higher accuracy at +25 °C than base TC1047 (vs TC1047)
- Low quiescent current for always-on monitoring (vs TMP36 (Analog Devices))
- Wide 2.5 V to 5.5 V supply tolerance (vs DS18B20 (Maxim Integrated))
Design Notes
Place a 0.1 µF ceramic decoupling capacitor as close as possible to the VDD pin (Pin 1) to suppress supply-noise coupling into the high-impedance analog output. The TC1047AVNBTR draws only 35 µA typical, so a small 0402 ceramic is sufficient. For noisy switching regulators nearby, add a 10 Ω series ferrite bead between the supply rail and VDD to prevent switching noise from corrupting the mV-level output. The 2.5 V to 5.5 V supply range permits direct connection to 3.3 V or 5 V MCU rails without level translation.
Use a small copper pour connected to GND (Pin 2) directly under the SOT-23B package to provide thermal coupling to the measurement target. Avoid routing high-current traces or switching node copper under the sensor, since local heating will add offset error. Keep digital signal traces away from the VOUT pin to avoid capacitive coupling that could inject noise into the high-impedance output. A guard trace tied to GND between VOUT and noisy signals further reduces pickup on long output traces.
Do not load VOUT heavily: the output impedance is high and excessive loading will cause voltage droop and accuracy error. Use an ADC input buffer or choose an MCU ADC with at least 10 kΩ input impedance. Ensure the ADC reference is stable, since the mV-level output (100 mV at -40 °C) is a small fraction of the reference and any reference drift will appear as temperature error. Avoid mounting the sensor directly above heat-generating components such as regulators or power FETs, as self-heating can shift the reading by several degrees.
Compliance Information
RoHS and REACH compliant per Microchip product page. Standard part is not AEC-Q100 qualified - check the TC1047A automotive-grade variant for vehicle applications.
