Key facts
- Model
- LM26
- Industry
- Industrial
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- 2
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- EN
- Last added
- 2012-05-08
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NATIONAL SEMICONDUCTOR -LM26 SOT-23 ±3°C Accurate Factory Preset Thermostat handbook
The LM26 is a precision, single digital‑output thermostat in a 5‑lead SOT‑23 package. It integrates an internal reference, DAC, temperature sensor and comparator, and can be factory‑programmed for a trip point between –55 °C and +110 °C with ±3 °C accuracy. The device offers configurable hysteresis (2 °C or 10 °C) and selectable open‑drain or push‑pull digital outputs.
The handbook includes functional descriptions, pin assignments, absolute maximum and operating ratings, ordering tables, typical application circuits such as fan control and thermal protection, and guidelines for after‑assembly testing using the Vyeyp analog output. Physical dimensions, land‑pattern recommendations, and noise‑rejection test results are also provided.
National Semiconductor LM26 specifications
| Power Supply Voltage | 2.7 V to 5.5 V |
|---|---|
| Power Supply Current | 40 µA (max), 20 pA (typ) |
| Hysteresis Temperature | 2 °C or 10 °C (typ) |
| Analog Output Slope | -10.82 mV/°C |
Source: NATIONAL SEMICONDUCTOR -LM26 SOT-23 ±3°C Accurate Factory Preset Thermostat handbook
All National Semiconductor LM26 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What temperature range can the LM26 be programmed for?
The LM26 can be factory‑programmed for a trip point anywhere between –55 °C and +110 °C.
From: NATIONAL SEMICONDUCTOR -LM26 SOT-23 ±3°C Accurate Factory Preset Thermostat handbook
What hysteresis settings are available and how are they selected?
Hysteresis can be set to 2 °C or 10 °C by connecting the HYST pin to V+ for 2 °C or to GND for 10 °C.
From: NATIONAL SEMICONDUCTOR -LM26 SOT-23 ±3°C Accurate Factory Preset Thermostat handbook