Specifications
| Type | Description |
|---|---|
| Part Number | LM57 |
| Manufacturer | Texas Instruments |
| Product Type | Resistor-programmable temperature switch |
| Category | Sensors |
| Package / Case | WSON/SD/NGR/DFN (8) 2.50 mm x 2.50 mm; TSSOP/PW (8) 3.00 mm x 6.40 mm |
| Supply Voltage | 2.4 to 5.5 V; recommended operating condition |
| Operating Free-Air Temperature Range | -50 to 150 °C; recommended operating condition, TMIN <= TA <= TMAX |
| Trip Temperature Range | -40 to 150 °C; selectable from 256 possible values |
| Temperature Trip-Point Programming | External resistors on SENSE1 and SENSE2; two external 1% resistors set TTRIP and VTEMP slope |
| Programmable VTEMP Slope J2 | -5.166 mV/°C; temperature transfer function option J2 |
| Programmable VTEMP Slope J3 | -7.752 mV/°C; temperature transfer function option J3 |
| Programmable VTEMP Slope J4 | -10.339 mV/°C; temperature transfer function option J4 |
| Programmable VTEMP Slope J5 | -12.924 mV/°C; temperature transfer function option J5 |
| Trip Point Accuracy LM57B | ±1.5 °C; J2, TA=-41°C to 52°C, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57C/LM57F/LM57T | ±2.3 °C; J2, TA=-41°C to 52°C, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57B | ±1.5 °C; J3, TA=52°C to 97°C, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57C/LM57F/LM57T | ±2.3 °C; J3, TA=52°C to 97°C, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57B | ±1.5 °C; J4, TA=97°C to 119°C, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57C/LM57F/LM57T | ±2.3 °C; J4, TA=97°C to 119°C, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57B | ±1.5 °C; J5, TA=119°C to free-air temperature max, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| Trip Point Accuracy LM57C/LM57F/LM57T | ±2.3 °C; J5, TA=119°C to free-air temperature max, VDD=2.4 V to 5.5 V, includes 1% set-resistor tolerance |
| VTEMP Accuracy LM57B | ±0.95 °C; J2, TA=-50°C to free-air temperature max, VDD=2.4 V to 5.5 V |
| VTEMP Accuracy LM57C/LM57F/LM57T | ±1.3 °C; J2, TA=-50°C to free-air temperature max, VDD=2.4 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.8 °C; J3, TA=-50°C to free-air temperature max, VDD=2.4 V to 5.5 V |
| VTEMP Accuracy LM57C/LM57F/LM57T | ±1.3 °C; J3, TA=-50°C to free-air temperature max, VDD=2.4 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.7 °C; J4, TA=20°C to 50°C, VDD=2.4 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.7 °C; J4, TA=0°C to free-air temperature max, VDD=2.7 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.8 °C; J4, TA=-50°C to 0°C, VDD=3.1 V to 5.5 V |
| VTEMP Accuracy LM57C/LM57F/LM57T | ±1.3 °C; J4 VTEMP accuracy conditions shown in table |
| VTEMP Accuracy LM57B | ±0.7 °C; J5, TA=60°C to free-air temperature max, VDD=2.4 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.7 °C; J5, TA=20°C to 50°C, VDD=2.9 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.7 °C; J5, TA=0°C to free-air temperature max, VDD=3.2 V to 5.5 V |
| VTEMP Accuracy LM57B | ±0.8 °C; J5, TA=-50°C to 0°C, VDD=4 V to 5.5 V |
| VTEMP Accuracy LM57C/LM57F/LM57T | ±1.3 °C; J5 VTEMP accuracy conditions shown in table |
| Digital Output TOVER | Active-high push-pull; asserted when measured temperature exceeds trip point or TRIP TEST=1 |
| Digital Output TOVER Complement | Active-low open-drain; asserted when measured temperature exceeds trip point or TRIP TEST=1; requires pullup resistor |
| Analog Output VTEMP | Class AB analog voltage output proportional to temperature with programmable NTC; TRIP TEST=0 |
| TRIP TEST Input | Active high; tie to ground if not used; if high, digital outputs assert and VTEMP=VTRIP |
| Thermal Hysteresis Options | 5 °C or 10 °C; depending on order number/device option |
| LM57BISD VTEMP Accuracy | ±0.8 °C; commercial grade, -50°C to 150°C |
| LM57BISD Trip Point Accuracy | ±1.5 °C; commercial grade, -50°C to 150°C |
| LM57CISD/LM57FPW/LM57TPW VTEMP Accuracy | ±1.3 °C; commercial grade, -50°C to 150°C |
| LM57CISD/LM57FPW/LM57TPW Trip Point Accuracy | ±2.3 °C; commercial grade, -50°C to 150°C |
| Absolute Maximum Supply Voltage | -0.3 to 6 V; over operating free-air temperature range |
| Absolute Maximum TOVER Voltage | -0.3 to 6 V; over operating free-air temperature range |
| Absolute Maximum TOVER, VTEMP, TRIP TEST, SENSE1, SENSE2 Voltage | -0.3 to VDD+0.3 V; over operating free-air temperature range |
| Absolute Maximum Current at Any Pin | 5 mA; over operating free-air temperature range |
| Storage Temperature | -65 to 150 °C; absolute maximum rating |
| ESD HBM WSON | ±5500 V; LM57BISD and LM57CISD in WSON package |
| ESD CDM WSON | ±1250 V; LM57BISD and LM57CISD in WSON package |
| ESD Machine Model WSON | ±450 V; LM57BISD and LM57CISD in WSON package |
| ESD HBM TSSOP | ±2000 V; LM57FPW and LM57TPW in TSSOP package, per ANSI/ESDA/JEDEC JS-001 |
| ESD CDM TSSOP | ±750 V; LM57FPW and LM57TPW in TSSOP package, per JEDEC JESD22-C101 |
| Junction-to-Ambient Thermal Resistance WSON | 71.3 °C/W; NGR WSON/SD package, 8 pins |
| Junction-to-Ambient Thermal Resistance TSSOP | 183 °C/W; PW TSSOP package, 8 pins |
| Junction-to-Case Top Thermal Resistance WSON | 82.8 °C/W; NGR WSON/SD package, 8 pins |
| Junction-to-Case Top Thermal Resistance TSSOP | 66 °C/W; PW TSSOP package, 8 pins |
| Junction-to-Board Thermal Resistance WSON | 43.4 °C/W; NGR WSON/SD package, 8 pins |
| Junction-to-Board Thermal Resistance TSSOP | 111 °C/W; PW TSSOP package, 8 pins |
| Junction-to-Top Characterization Parameter WSON | 2.2 °C/W; NGR WSON/SD package, 8 pins |
| Junction-to-Top Characterization Parameter TSSOP | 8 °C/W; PW TSSOP package, 8 pins |
| Junction-to-Board Characterization Parameter WSON | 43.7 °C/W; NGR WSON/SD package, 8 pins |
| Junction-to-Board Characterization Parameter TSSOP | 110 °C/W; PW TSSOP package, 8 pins |
| Junction-to-Case Bottom Thermal Resistance WSON | 11.9 °C/W; NGR WSON/SD package, 8 pins |
| Datasheet Status | request_only |
Product Overview
The LM57 is a Texas Instruments resistor-programmable temperature switch in the Sensor category. Its trip point is programmed with two external 1% resistors connected to SENSE1 and SENSE2, setting both TTRIP and the VTEMP slope. The selectable trip temperature range is -40 to 150 °C with 256 possible values.
The device supports four programmable VTEMP slope options: J2 at -5.166 mV/°C, J3 at -7.752 mV/°C, J4 at -10.339 mV/°C, and J5 at -12.924 mV/°C. VTEMP is a Class AB analog voltage output proportional to temperature with programmable NTC behavior when TRIP TEST is 0.
Digital outputs include an active-high push-pull TOVER output and an active-low open-drain TOVER complement that requires a pullup resistor. Both assert when the measured temperature exceeds the programmed trip point or when TRIP TEST is high. Packages include 8-pin WSON/SD/NGR/DFN at 2.50 mm x 2.50 mm and 8-pin TSSOP/PW at 3.00 mm x 6.40 mm.
Key Features
- 2.4 to 5.5 V recommended supply range
- -50 to 150 °C operating free-air range
- -40 to 150 °C selectable trip temperature range
- 256 possible trip-temperature values
- External 1% resistors program TTRIP and VTEMP slope
- Four programmable VTEMP slopes from J2 through J5
- Active-high push-pull TOVER digital output
- Active-low open-drain TOVER complement output
- Class AB VTEMP analog temperature output
- 5 °C or 10 °C thermal hysteresis options
Typical Applications
- Temperature threshold detection
- Programmable overtemperature monitoring
- Analog temperature voltage output
- Systems using push-pull thermal flags
- Systems using open-drain thermal flags
- Trip-test verification circuits
- Wide-temperature sensor assemblies
Procurement Notes
When requesting a quote for LM57, 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 power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of device is the LM57?
The LM57 is a Texas Instruments Sensor device described as a resistor-programmable temperature switch. It uses external resistors on SENSE1 and SENSE2 to set the temperature trip point and VTEMP slope.
What supply voltage range does the LM57 support?
The recommended operating supply voltage range for the LM57 is 2.4 to 5.5 V. Several accuracy specifications are also stated across 2.4 V to 5.5 V, depending on slope option and temperature condition.
How are LM57 trip points programmed?
The LM57 trip point is programmed with two external 1% resistors connected to SENSE1 and SENSE2. These resistors set TTRIP and the VTEMP slope, with trip temperatures selectable from 256 possible values.
What outputs are available on the LM57?
The LM57 provides an active-high push-pull TOVER output, an active-low open-drain TOVER complement output requiring a pullup resistor, and a Class AB VTEMP analog voltage output proportional to temperature.
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.