Specifications
| Type | Description |
|---|---|
| Part Number | LM73 |
| Manufacturer | Texas Instruments |
| Product Type | Digital temperature sensor |
| Category | Sensors |
| Package / Case | 6-pin SOT-23, DDC; body size 2.90 mm x 1.60 mm |
| Supply Voltage Range | 2.7 to 5.5 V; recommended operating conditions |
| Operating Temperature Range | -40 to 150 °C; LM73CIMK-0, LM73CIMK-1 |
| Temperature Accuracy | ±1 °C max; VDD = 2.7 V to 4.5 V, TA = -10 °C to 80 °C |
| Temperature Accuracy | ±1.5 °C max; VDD = 2.7 V to 4.5 V, TA = -25 °C to 115 °C |
| Temperature Accuracy | ±2 °C max; VDD = 2.7 V to 4.5 V, TA = -40 °C to 150 °C |
| Temperature Accuracy | ±1.5 °C max; VDD > 4.5 V to 5.5 V, TA = -10 °C to 80 °C |
| Temperature Accuracy | ±2 °C max; VDD > 4.5 V to 5.5 V, TA = -25 °C to 115 °C |
| Temperature Accuracy | ±2.5 °C max; VDD > 4.5 V to 5.5 V, TA = -40 °C to 150 °C |
| Resolution | 11 bits, 0.25 °C/LSB; RES1 = 0, RES0 = 0; default mode |
| Resolution | 12 bits, 0.125 °C/LSB; RES1 = 0, RES0 = 1 |
| Resolution | 13 bits, 0.0625 °C/LSB; RES1 = 1, RES0 = 0 |
| Resolution | 14 bits, 0.03125 °C/LSB; RES1 = 1, RES0 = 1 |
| Temperature Conversion Time | 10.1 ms typ, 14 ms max; 11-bit mode, TA = TJ = TMIN to TMAX |
| Temperature Conversion Time | 20.2 ms typ, 28 ms max; 12-bit mode, TA = TJ = TMIN to TMAX |
| Temperature Conversion Time | 40.4 ms typ, 56 ms max; 13-bit mode, TA = TJ = TMIN to TMAX |
| Temperature Conversion Time | 80.8 ms typ, 112 ms max; 14-bit mode, TA = TJ = TMIN to TMAX |
| Quiescent Current | 320 µA typ, 495 µA max; continuous conversion mode, SMBus inactive, TA = TJ = TMIN to TMAX |
| Shutdown Current | 120 µA typ, 175 µA max; shutdown mode, bus-idle timers on, TA = TJ = TMIN to TMAX |
| Shutdown Current | 1.9 µA typ, 8 µA max; shutdown mode, bus-idle timers off, TA = TJ = TMIN to TMAX |
| Power-On Reset Threshold | 0.9 V; measured on VDD input, falling edge, TA = TJ = TMIN to TMAX |
| Interface Type | SMBus and I2C-compatible two-wire interface; device description and features |
| SMBus Clock Frequency | 400 kHz max; no minimum clock frequency if time-out feature is disabled |
| SMBus Clock Low Time | 300 ns min; VDD = 2.7 V to 5.5 V, CL = 400 pF |
| SMBus Clock High Time | 300 ns min; VDD = 2.7 V to 5.5 V, CL = 400 pF |
| Output Fall Time | 250 ns max; CL = 400 pF, IO_PULL-UP <= 3 mA |
| Serial Interface Timeout | 15 ms min, 45 ms max; SMBDAT or SMBCLK low for reset of serial interface |
| Digital Input High Voltage | 0.7 x VDD min; SMBDAT and SMBCLK inputs |
| Digital Input Low Voltage | 0.3 x VDD max; SMBDAT and SMBCLK inputs |
| SMBDAT and SMBCLK Input Hysteresis | 0.07 x VDD typ; digital inputs |
| SMBus Low-Level Output Voltage | 0.4 V max; IOL = 3 mA, SMBDAT and ALERT outputs |
| Address Select | One of three addresses per version, six possible addresses total; ADDR pin connected to GND, left floating, or connected to VDD |
| Alert Output | Open-drain active output; goes active when measured temperature exceeds programmable temperature limit |
| Absolute Maximum Supply Voltage | -0.3 to 6 V; absolute maximum ratings |
| Storage Temperature | -65 to 150 °C; absolute maximum ratings |
| Junction-to-Ambient Thermal Resistance | 224 °C/W; DDC SOT, 6 pins |
| Junction-to-Case Top Thermal Resistance | 89 °C/W; DDC SOT, 6 pins |
| Datasheet Status | request_only |
Product Overview
The LM73 is a Texas Instruments digital temperature sensor for Sensor applications using an SMBus and I2C-compatible two-wire interface. It operates from a recommended 2.7 to 5.5 V supply, with LM73CIMK-0 and LM73CIMK-1 operation specified across -40 to 150 °C.
Temperature measurement can be configured from 11-bit default resolution at 0.25 °C/LSB through 14-bit resolution at 0.03125 °C/LSB. Conversion time scales with resolution, from 10.1 ms typical in 11-bit mode to 80.8 ms typical in 14-bit mode. Accuracy limits depend on supply voltage and temperature range, with ±1 °C maximum specified from -10 °C to 80 °C at 2.7 to 4.5 V.
The device is supplied in a 6-pin SOT-23 DDC package with a 2.90 mm x 1.60 mm body. System integration features include three address-select states per version, six possible addresses total, a 400 kHz maximum SMBus clock, and an open-drain active ALERT output that asserts when measured temperature exceeds a programmable limit.
Key Features
- 2.7 to 5.5 V recommended supply range
- -40 to 150 °C specified operating range
- ±1 °C maximum accuracy over -10 °C to 80 °C
- Selectable 11-bit to 14-bit temperature resolution
- Default 11-bit mode provides 0.25 °C/LSB
- 14-bit mode provides 0.03125 °C/LSB
- SMBus and I2C-compatible two-wire interface
- 400 kHz maximum SMBus clock frequency
- Open-drain ALERT output for programmable temperature limit
- Six possible addresses across device versions
- 1.9 µA typical shutdown current with timers off
- 6-pin SOT-23 DDC package
Typical Applications
- SMBus temperature monitoring
- I2C-compatible temperature sensing
- Programmable overtemperature alerting
- Multi-address sensor networks
- Low-current shutdown designs
- Compact SOT-23 sensor assemblies
Procurement Notes
When requesting a quote for LM73, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For memory and storage sourcing, density, organization, speed grade, voltage, package, temperature grade, date code, lifecycle status and original packing condition should be verified before approval.
FAQ
What supply voltage range does the LM73 support?
The LM73 is specified for a recommended supply voltage range of 2.7 to 5.5 V. Its absolute maximum supply voltage rating is -0.3 to 6 V, which is separate from the recommended operating condition.
What resolution settings are available on the LM73?
The LM73 supports selectable temperature resolution from 11 to 14 bits. The default mode is 11 bits at 0.25 °C/LSB, while the highest listed setting is 14 bits at 0.03125 °C/LSB.
How does LM73 conversion time change with resolution?
Temperature conversion time increases as resolution increases. Typical conversion time is 10.1 ms in 11-bit mode, 20.2 ms in 12-bit mode, 40.4 ms in 13-bit mode, and 80.8 ms in 14-bit mode.
What interface does the LM73 use?
The LM73 uses an SMBus and I2C-compatible two-wire interface. The SMBus clock frequency is specified up to 400 kHz, with no minimum clock frequency when the timeout feature is disabled.
What is the LM73 ALERT output used for?
The ALERT output is an open-drain active output. It goes active when the measured temperature exceeds a programmable temperature limit, enabling temperature-limit signaling through the device interface.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 28, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.