Specifications
| Type | Description |
|---|---|
| Part Number | LM135 |
| Manufacturer | Texas Instruments |
| Product Type | Precision temperature sensor |
| Category | Sensors |
| Package / Case | TO-46 (NDV), 3 pins, 4.699 mm x 4.699 mm nominal body size |
| Sensor Output Scale | 10 mV/K; breakdown voltage proportional to absolute temperature |
| Operating Principle | 2-terminal zener; temperature sensor operation |
| Dynamic Impedance | <1 ohm; general device description |
| Operating Current Range | 400 uA to 5 mA; general operation |
| Typical Calibrated Error | <1 °C; calibrated at 25°C over 100°C temperature range |
| Operating Temperature Range | -55°C to 150°C; LM135 continuous operation |
| Reverse Current Absolute Maximum | 15 mA max; over operating free-air temperature range |
| Forward Current Absolute Maximum | 10 mA max; over operating free-air temperature range |
| Storage Temperature | -60°C to 150°C; TO/TO-92 package |
| Continuous Specified Temperature | -55°C to 150°C; LM135, LM135A; TMIN <= TA <= TMAX |
| Intermittent Specified Temperature | 150°C to 200°C; LM135, LM135A |
| Recommended Forward Current | 0.4 mA min, 1 mA nom, 5 mA max; recommended operating conditions |
| Junction-to-Ambient Thermal Resistance | 400 °C/W; LM135/LM135A, TO-46 NDV 3-pin package |
| Operating Output Voltage | 2.95 V min, 2.98 V typ, 3.01 V max; LM135/LM235, TC=25°C, IR=1 mA |
| Uncalibrated Temperature Error at 25°C | 1 °C typ, 3 °C max; LM135/LM235, TC=25°C, IR=1 mA |
| Uncalibrated Temperature Error Over Range | 2 °C typ, 5 °C max; LM135/LM235, TMIN <= TC <= TMAX, IR=1 mA |
| Temperature Error with 25°C Calibration | 0.5 °C typ, 1.5 °C max; LM135/LM235, TMIN <= TC <= TMAX, IR=1 mA |
| Calibrated Error at Extended Temperature | 2 °C max; LM135/LM235, TC=TMAX intermittent |
| Temperature Non-Linearity | 0.3 °C typ, 1 °C max; LM135/LM235, IR=1 mA |
| Operating Output Voltage Change with Current | 2.5 mV typ, 10 mV max; 400 uA <= IR <= 5 mA, constant temperature |
| Dynamic Impedance at IR=1 mA | 0.5 ohm typ; LM135/LM235/LM135A/LM235A |
| Output Voltage Temperature Coefficient | 10 mV/°C; LM135/LM235/LM135A/LM235A |
| Time Constant in Still Air | 80 sec; LM135/LM235/LM135A/LM235A |
| Time Constant in 100 ft/min Air | 10 sec; LM135/LM235/LM135A/LM235A |
| Time Constant in Stirred Oil | 1 sec; LM135/LM235/LM135A/LM235A |
| Time Stability | 0.2 °C/khr; TC=125°C |
| Calibration Voltage | 2.982 V; calibrate for 25°C |
| Positive Input Pin | +; SOIC pin 8; TO-46/TO-92 package pin shown in package drawing |
| Negative Output Pin | -; SOIC pin 4; TO-46/TO-92 package pin shown in package drawing |
| Calibration Adjust Pin | ADJ; SOIC pin 5; calibration adjust terminal |
| Datasheet Status | request_only |
Product Overview
The Texas Instruments LM135 is a precision temperature sensor built around a 2-terminal zener operating principle. Its breakdown voltage is proportional to absolute temperature, giving a sensor output scale of 10 mV/K and an output voltage temperature coefficient of 10 mV/°C. At 25°C with IR = 1 mA, the operating output voltage is specified at 2.95 V minimum, 2.98 V typical, and 3.01 V maximum.
Key Features
- 10 mV/K output proportional to absolute temperature
- 2-terminal zener temperature sensor operating principle
- 400 uA to 5 mA operating current range
- -55°C to 150°C continuous operating temperature range
- 2.95 V to 3.01 V output at 25°C
- 0.5 °C typical calibrated range error
- 0.3 °C typical temperature non-linearity
- 0.5 ohm typical dynamic impedance at 1 mA
- 80 sec still-air thermal time constant
- ADJ terminal supports 25°C calibration
Typical Applications
- Absolute temperature sensing
- Calibrated temperature measurement
- Wide-range thermal monitoring
- Air temperature response measurement
- Oil temperature response measurement
- Zener-style temperature reference circuits
- Systems using 10 mV/K output
Procurement Notes
When requesting a quote for LM135, 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 analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What output scale does the LM135 provide?
The LM135 provides a 10 mV/K sensor output scale. Its breakdown voltage is proportional to absolute temperature, and the extracted datasheet facts also list a 10 mV/°C output voltage temperature coefficient.
What temperature range is specified for LM135 continuous operation?
The LM135 is specified for continuous operation from -55°C to 150°C. The extracted facts also list an intermittent specified temperature range of 150°C to 200°C for LM135 and LM135A.
What current range is recommended for the LM135?
The recommended forward current is 0.4 mA minimum, 1 mA nominal, and 5 mA maximum. The general operating current range is listed as 400 uA to 5 mA.
How is the LM135 calibrated at 25°C?
The extracted facts list a calibration voltage of 2.982 V for 25°C calibration. With 25°C calibration, temperature error over the specified range is listed as 0.5 °C typical and 1.5 °C maximum.
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.