LMT84LPM - 1.5V 10uA Analog Temp Sensor TO-92 | TI
MPN: LMT84LPM β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.5 | $5.00 |
| 100 | $0.38 | $38.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.26 | $260.00 |
Drop-in alternatives for LMT84LPM β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LMT84-Q1
β Drop-Inπ Reference alternative (not in catalog)
LMT85
β Drop-Inπ Reference alternative (not in catalog)
LMT86
β Drop-Inπ Reference alternative (not in catalog)
LMT87
β Drop-Inπ Reference alternative (not in catalog)
TMP235
β‘ Same Packageπ Reference alternative (not in catalog)
LM94022
β‘ Same Packageπ Reference alternative (not in catalog)
LMT84LPM Maximum Ratings & Electrical Characteristics
| Sensor Type | Analog output local temperature sensor |
| Temperature Range | -50C to +150C |
| Accuracy | +/-0.4C typical, +/-2.7C maximum |
| Sensor Gain | -5.5 mV/C |
| Supply Voltage (Min) | 1.5 V |
| Supply Voltage (Max) | 5.5 V |
| Quiescent Current | 5.4 uA (approx. 10 uA class) |
| Power-On Time | 0.7 ms |
| Output Type | Class-AB push-pull analog |
| Output Polarity | Inverse (voltage decreases with temperature) |
| Output Capability | Strong source and sink current drive |
| Package | TO-92-3 |
| Mounting Type | Through Hole |
| Automotive Qualification | LMT84-Q1 variant AEC-Q100 Grade 0 |
| RoHS Status | Compliant |
LMT84LPM Pin Configuration
| Pin 1 | VDD β Power supply, 1.5V to 5.5V |
| Pin 2 | VOUT β Analog temperature output, -5.5 mV/C inverse slope |
| Pin 3 | GND β Ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LMT84LPM is suitable for 6 applications: Battery-Powered Sensing Nodes, Automotive Thermal Monitoring, Appliance and HVAC Temperature Sensing, Portable Medical Devices, RF and Radio Module Temperature Compensation, Industrial Thermal Protection and Cutoff.
Battery-Powered Sensing Nodes
The LMT84's 5.4 uA quiescent current and 1.5V minimum supply make it ideal for coin-cell and single-cell battery nodes. Its 0.7 ms power-on time enables aggressive duty-cycling: the MCU can power the sensor only during a reading, cutting average current far below continuous-operation sensors. Placed on the battery or PCB hotspot with the output feeding an MCU ADC input, the -5.5 mV/C linear transfer avoids lookup tables, and no divider current flows since the Class-AB output sources current directly.
Recommended
Automotive Thermal Monitoring
The AEC-Q100 Grade 0 qualified LMT84-Q1 variant, manufactured on an automotive grade flow, covers -50C to +150C with +/-0.4C typical accuracy - suited to cabin climate control, battery pack, and powertrain thermal sensing. The inverse analog output resists wired-OR contention and a shorted output reads as an implausible maximum temperature, aiding fault detection. Signal conditioning is minimal because the Class-AB push-pull output can drive RC filters and cable capacitance toward an MCU ADC without a buffer amplifier.
Recommended
Appliance and HVAC Temperature Sensing
In refrigerators, thermostats, and HVAC controllers, the LMT84 replaces NTC thermistor dividers, eliminating divider bias current and Steinhart-Hart linearization. The -5.5 mV/C output gives roughly 22 LSB/C on a 10-bit, 3.3V ADC - adequate for 0.5C-class control. Its 1.5V-capable operation allows sensing directly from low-voltage rails, and the TO-92 package can be glued or clipped to metal surfaces for air or evaporator temperature measurement with simple 100 nF output filtering.
Recommended
Portable Medical Devices
Wearable and handheld medical instruments benefit from the LMT84's 5.4 uA consumption and small SC70 footprint, extending battery life in thermometers and patient monitors. The +/-0.4C typical accuracy supports body-temperature trending, while the analog output integrates easily with low-power MCU ADCs without digital bus timing complexity. For skin-temperature probes, the inverse transfer function and push-pull output maintain signal integrity across long probe leads when paired with a modest RC anti-alias filter.
Recommended
RF and Radio Module Temperature Compensation
Power amplifiers, VCOs, and crystal oscillators drift with temperature; the LMT84 provides a fast (0.7 ms power-on), low-noise analog voltage that a baseband MCU or FPGA ADC reads for lookup-based power or frequency compensation. Its 5.4 uA draw suits always-on radio nodes, and the SC70 package mounts near the PA die for accurate hotspot sensing. The push-pull output rejects supply ripple better than a thermistor divider, reducing compensation error on noisy RF boards.
Recommended
Industrial Thermal Protection and Cutoff
The LMT84 feeds a comparator or MCU ADC for over-temperature shutdown in motor drives, power supplies, and LED drivers spanning -50C to +150C. The Class-AB output can directly drive comparator inputs and long wiring with hysteresis networks, and the inverse slope means a broken or shorted sensor produces an out-of-range code that firmware can flag as a fault. The 1.5V-capable supply also allows biasing from an existing low-voltage reference rail without a dedicated regulator.
Recommended
Recommended Products Summary
Engineering reference data for LMT84LPM β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMT84-Q1 | LMT85 | LMT87 | TMP235 |
|---|---|---|---|---|---|
| Package | TO-92-3 | SC70-5 | SC70-5 / TO-92-3 | SC70-5 / TO-92-3 | SC70-5 / SOT23-3 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Sensor Gain | -5.5 mV/C | -5.5 mV/C | -8.2 mV/C | -13.6 mV/C | -5.5 / -8.2 / -10.9 / -13.6 mV/C (pin-selectable) |
| Supply Voltage Range | 1.5 V to 5.5 V | 1.5 V to 5.5 V | 1.5 V to 5.5 V | 1.5 V to 5.5 V | 2.3 V to 5.5 V |
| Quiescent Current | 5.4 uA | 5.4 uA | 4.7 uA | 4.7 uA | [DATA_NEEDED] |
| Temperature Range | -50C to +150C | -50C to +150C | -50C to +150C | -50C to +150C | -40C to +150C |
| Typical Accuracy | +/-0.4C | +/-0.4C | +/-0.4C | +/-0.4C | [DATA_NEEDED] |
| Automotive Qualification | No (LMT84-Q1 variant only) | AEC-Q100 Grade 0 | No | No | TMP235-Q1 available |
Key Differentiators
- Lowest gain sensitivity to ADC noise in family (vs LMT87)
- 1.5V minimum supply (vs TMP235)
- Automotive upgrade path on same die (vs LMT84-Q1)
Design Notes
Place a 0.1 uF bypass capacitor within 2 mm of the VDD pin; the LMT84 is stable with or without an output capacitor, but adding 100 nF to 1 uF on VOUT forms an RC noise filter. Because the output is push-pull (Class-AB), no pull-up or pull-down resistor is required, unlike thermistor divider circuits.
The LMT84 output slope is negative: temperature rises cause the ADC code to fall. Firmware implementing simple threshold comparisons frequently inverts trip logic and causes shutdown failures. Use the datasheet VOUT lookup table rather than a single linear equation for best accuracy across -50C to +150C, since the transfer curve is slightly nonlinear at range extremes.
Exploit the 0.7 ms power-on time for battery designs: gate the sensor supply with an MCU GPIO or load switch and power it only during conversions. At a 1 Hz sample rate with 1 ms on-time, average sensor current drops to roughly 5 nA plus switch leakage - orders of magnitude below continuous operation of 5.4 uA.
For remote sensing with long leads, add an RC filter (e.g., 1 kOhm + 1 uF) at the ADC input to reject cable pickup; the Class-AB output sinks this loading without drift. Self-heating is minimal at 5.4 uA but avoid routing high-current traces under the TO-92 package for accurate ambient measurement.
Compliance Information
LMT84-Q1 variant is AEC-Q100 Grade 0 qualified on automotive grade flow per TI datasheet. Standard LMT84LPM is not automotive qualified.
