LM35 Temperature Sensors and Mixed Electronic Components
LM35 temperature sensors within a mixed electronic-components selection
Looking for an LM35 analog temperature-sensor IC? Select the exact LM35DZ or LM35D variant in this collection. The current selection is unusually broad: it also contains LM358 operational amplifiers, LM350/LM317 voltage regulators, assorted IC kits, signal-generator boards and other devices whose similar-looking part numbers do not make them temperature sensors. This guide separates their functions before you compare packages and quantities. A product title that lists several model numbers can be a variant menu; the chosen option, not the full headline, determines what arrives.
LM35: a voltage-output temperature IC
An LM35-family device produces an analog output proportional to Celsius temperature. The familiar nominal scale factor is 10 mV per °C: for example, a properly biased device at 25°C would ideally give about 250 mV. That conversion is a device characteristic, not a guarantee that a particular assembly is calibrated to an exact temperature. The host needs a suitable voltage-measuring input, such as an ADC with a known reference, and must apply any system-level calibration and filtering required by the application. Unlike a DS18B20, the LM35 does not speak 1-Wire or provide a unique digital sensor address. Unlike an NTC thermistor, its basic output is not a changing resistance.
The exact suffix and data sheet matter. Listings here explicitly offer LM35DZ and LM35D in TO-92-style through-hole packages; “LM35” alone in a broad headline does not settle the selected suffix, maker, accuracy grade, temperature range or provenance. Check the selected part's data sheet for supply conditions, output accuracy and specified measurement range rather than applying a single number to every suffix. A simple positive-supply configuration is often discussed for temperatures at or above 0°C, while readings below 0°C can require additional circuit provisions. Do not assume a single-supply, ground-referenced hobby ADC can represent a negative LM35 output without an appropriate design.
How to find the actual sensor
- LM35DZ TO-92 packs: a ten-piece LM35DZ product is explicitly listed as a through-hole sensor. Other product pages offer LM35DZ in selectable packs from two to 100 pieces. Verify that the chosen part-number option, package and count match the order; a ten-piece quantity on a multi-model page may apply to the chosen model only.
- Mixed temperature-device menus: listings place LM35DZ beside LM61CIZ, LM134Z, LM135Z, LM334Z, LM335Z, DS18B20, TMP36GT9Z, BMP and BME devices. Those names do not share one voltage-output transfer function. LM335 is a Kelvin-proportional temperature device with different biasing; LM334 is a current-source device, and DS18B20 is a 1-Wire digital thermometer. A BMP/BME environmental breakout may measure pressure, humidity or temperature depending on its actual sensor. Select LM35DZ if the design expects LM35 analog volts per degree Celsius.
- TO-92 is a package, not a function: several pages group temperature ICs, transistors and reference devices in the same three-lead plastic outline. Matching the physical package alone does not establish the same lead order, electrical limits or output law. Confirm the selected exact part number and pinout before committing a PCB footprint or socket wiring.
- “New original” and other seller claims: supplier descriptions make a range of origin and condition statements, but those phrases do not independently verify manufacturer traceability or calibration. For controlled procurement, check markings, supplier documents and the required traceability process for the specific selected lot.
What else is currently shown here?
LM358, LM258 and LM2904 op amps. Many products are DIP-8, SOP-8 or TSSOP-8 dual operational-amplifier ICs or LM358-based amplifier boards. They amplify or condition analog signals in a properly designed circuit; they do not internally sense ambient temperature like an LM35. Some pages offer LM358P, LM358N, LM358DR, LM358DT, LM358PWR, LM258 and LM2904 as separate variants. Examine supply range, input common-mode range, output swing, offset and package for the selected exact device before using one in a sensor front-end. A “100 times gain” LM358 module is an assembled amplifier board, not a one-hundred-fold more sensitive LM35 sensor.
LM350, LM317, LM337 and LM338 regulators. TO-220 listings show adjustable voltage-regulator alternatives, sometimes with ten-, thirty-, fifty- or hundred-piece selections. LM350T is a power regulator, not a temperature-sensor grade of LM35; the extra zero changes the device entirely. LM337 is a negative regulator and cannot be dropped into a positive LM317 circuit without a different design. Confirm output polarity, input/output headroom, current rating and heat sinking for the chosen part. L7805 is a fixed-voltage regulator, and IRF3205 is a MOSFET: neither outputs temperature in degrees Celsius.
Assortment kits and general-purpose ICs. Some pages deliver multi-value IC kits containing NE555, LM358, LM324, LM393, LM386, PC817, ULN2003 and related parts; others provide a chosen ten-piece model from a long option list. A fixed 75-, 85- or 150-piece assortment is a kit of its specified constituent devices, not necessarily a bag of LM35 sensors. A model-selector listing is different: choosing “LM358P” means that model, not the other models printed in the headline. Check the actual packing list or chosen variant for part numbers and per-type quantities.
Assembled modules and instruments. Signal generators, weak-signal amplifier modules, LM358 battery alarms, LED VU meters and SG3525/LM358 inverter-driver boards each have their own input, output and power-supply requirements. They are not temperature probes simply because a component number begins with LM35. High-power inverter claims in source titles are not guarantees of safe operating power or complete-system suitability. Choose the circuit by its documented function and design rather than trying to adapt it as a substitute thermometer.
Design considerations for a real LM35 measurement
ADC and reference. The host ADC measures voltage, then software converts that voltage using the device's appropriate transfer function. With a nominal 10 mV/°C scale, reference-voltage error, ADC offset, quantization and supply/ground noise can materially affect reported temperature. Determine the ADC input range and the highest expected output voltage from the chosen device and measurement range. More display decimal places are not a substitute for an accuracy budget or calibration.
Sensor placement and response. A bare TO-92 part senses its local package temperature, which may differ from the surrounding air or the object being measured. Nearby regulators, high-current components, sunlight, airflow, enclosure walls and lead-conducted heat can skew the reading. Mount the selected part where the target temperature actually exists, protect the leads appropriately and allow thermal settling. The bare IC is not a waterproof immersion probe; a sealed assembly requires separately specified construction.
Lead order and electrical safety. Do not guess supply, output and ground pins from the TO-92 silhouette or another temperature device. Orient the selected device according to its actual manufacturer data sheet, and verify the ADC's allowable input voltage. Long analog cables may pick up interference or introduce ground error; the needed buffering, filtering and shielding depend on the host and installation. No single generic wiring diagram applies to every module and sensor variant here.
Application boundary. LM35 provides a measurement signal, not a thermostat, mains switch, over-temperature protection system or certified safety controller. If the application can damage equipment or harm people, specify independent protections and appropriate verification. Do not transpose the measurement range, pinout or accuracy of LM35DZ to TMP36, LM335, DS18B20 or an LM358 board.
Quick selection checklist
- For an LM35 temperature project, choose an option explicitly labeled LM35DZ or the required LM35-family suffix; do not confuse LM350T and LM358P with LM35.
- Confirm the ordered quantity, part suffix and physical package against the chosen variant. A multi-model title is not automatically a mixed pack.
- Match the exact data-sheet supply, pin orientation, temperature range and ADC voltage window. Plan the entire error budget rather than extrapolating from resolution.
- If you need 1-Wire, choose a genuine compatible digital sensor option, not an LM35. If you need an op amp, regulator or a soldering assortment, use its own electrical specifications.
- Check whether the product is a loose chip, preassembled module, fixed assortment kit or finished electronic board before assuming which accessories or connectors are included.
This collection retains its current mixed product selection. The LM35 information applies to selected LM35-family variants only; other items remain described by their actual component functions rather than being presented as interchangeable temperature sensors.
