Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Temperature Range | −55°C to +125°C |
| Accuracy | ±2°C maximum over −55°C to +125°C |
| Resolution | User-selectable 9 to 12 bits |
| Supply | 2.7 V to 5.5 V |
| Alert Function | Dedicated ALERT output for programmable temperature limits |
| Bus Addressing | One address pin; up to three TMP101 devices on one bus |
| Power | 45 µA typical inactive-bus quiescent current; 0.1 µA typical shutdown |
| Packing | SOT-23 (DBV), 6 pins; 3000-piece large tape and reel |
Product Overview
TMP101NA/3K shares the TMP10x temperature-conversion core but uses the sixth package pin for an ALERT output instead of the second TMP100 address input. That makes it better suited to thermal threshold interrupt or thermostat functions where the host should not continuously poll temperature.
The alert thresholds and operating mode are programmable over the two-wire interface. A controller can therefore use TMP101 as both a digital thermometer and a hardware-assisted overtemperature indicator.
The tradeoff is bus density: one address pin supports up to three TMP101 devices, compared with as many as eight TMP100 devices.
For related devices, see HKEQGOO’s Temperature Sensors category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TMP101NA/3K |
| Temperature Range | −55°C to +125°C |
| Accuracy | ±2°C maximum over −55°C to +125°C |
| Resolution | User-selectable 9 to 12 bits |
| Supply | 2.7 V to 5.5 V |
| Alert Function | Dedicated ALERT output for programmable temperature limits |
| Bus Addressing | One address pin; up to three TMP101 devices on one bus |
| Power | 45 µA typical inactive-bus quiescent current; 0.1 µA typical shutdown |
| Packing | SOT-23 (DBV), 6 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | T101 |
Functional Highlights
ALERT can reduce host polling
The dedicated open-drain ALERT output lets firmware react to programmed temperature limits without reading the temperature register continuously. Pull-up design and alert polarity/mode must match the host interrupt interface.
Bus density is lower than TMP100
Choosing ALERT consumes a package pin that TMP100 uses for address selection. Systems with more than three same-bus TMP101 sensors need bus segmentation, an address translator, or a different sensor.
Design Considerations
- Set alert threshold and hysteresis behavior for the real thermal limit, not merely for the sensor accuracy range.
- Account for conversion time when selecting 9-, 10-, 11- or 12-bit resolution.
- Place the device away from unrelated heat sources if ambient or remote board temperature is the target quantity.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TMP101NA/3K as Active / Production; SOT-23 (DBV), 6 pins; 3000-piece large tape and reel; Level-2-260C-1 YEAR; −55°C to +125°C; marking T101.
Related Engineering Resources
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For a TI SOT-23-6 digital temperature sensor needing an additional hardware address-selection input rather than a dedicated ALERT output, compare TMP100NA/3K. TMP101NA/3K exposes ALERT on pin 3, whereas TMP100NA/3K uses the same pin for ADD1. Both use I²C/SMBus and operate at 2.7–5.5 V; check the pin configuration and software requirements before a redesign. These are not automatic drop-in replacements.
