My Inquiry
My Account
Texas Instruments LM35DM
- Part No.:
- LM35DM
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM35DM.pdf
- Description:
- SENSOR ANALOG 0C-100C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM35DM from Texas Instruments is a precision analog-output centigrade temperature sensor IC with linear 10 mV/°C scaling, ±1°C accuracy over −55°C to +150°C, 60 µA quiescent current, and SOIC-8 surface-mount package. It operates from 4 V to 30 V and delivers low-impedance output (0.1 Ω) for direct interfacing with ADCs in industrial monitoring systems.
For engineers reviewing the LM35DM datasheet, LM35DM pinout, LM35DM application, or LM35DM equivalent, key selection criteria include its calibrated Celsius output, full-range operation without external trimming, low self-heating (<0.1°C), and compatibility with single-supply microcontroller-based sensing nodes.
Technical Context
The LM35DM implements a delta-VBE-based temperature-sensing element buffered by a Class-A amplifier, delivering a ratiometric analog voltage directly proportional to junction temperature. Its output stage sources current only (sink capability limited to 1 µA) and exhibits <0.5 Ω typical output impedance under 1 mA load.
No internal compensation or calibration circuitry is required-the device achieves inherent linearity (±0.3°C nonlinearity) and stability (±0.08°C long-term drift) via wafer-level trimming. It functions identically across supply voltages from 4 V to 30 V with negligible line regulation error (±0.02 mV/V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale | 10 mV/°C - enables direct Celsius readout without offset subtraction or Kelvin conversion |
| Accuracy | ±1°C over −55°C to +150°C - ensures reliable thermal monitoring in harsh environments without recalibration |
| Supply Range | 4 V to 30 V - supports wide-input industrial power rails and battery-backed systems |
| Quiescent Current | 60 µA at 25°C - minimizes system power budget and self-heating (<0.1°C in still air) |
| Output Impedance | 0.1 Ω at 1 mA - allows direct connection to 12-bit ADCs without buffering amplifiers |
| Nonlinearity | ±0.3°C typical - reduces software correction overhead in embedded temperature algorithms |
| Operating Temp | −55°C to +150°C - qualified for under-hood automotive, motor control, and power supply thermal protection |
Pinout & Package
LM35DM is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 4.90 mm × 3.91 mm body size and gull-wing leads. Pin 1 is +VS, pin 2 is VOUT, pin 4 is GND; pins 3, 5–8 are no-connect (N.C.) per TI's official pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 1) | Positive power supply input | Accepts 4 V–30 V DC; powers internal bandgap and amplifier; no reverse-polarity protection |
| VOUT (Pin 2) | Analog temperature output | Provides 10 mV/°C linear voltage; low-impedance source only; requires high-Z or resistive load |
| GND (Pin 4) | Reference ground | Device substrate reference; must connect to system ground plane for accurate thermal measurement |
| N.C. (Pins 3,5–8) | No electrical connection | Not bonded internally; must remain unconnected-no pull-up/down or routing allowed |
Key Features
| Feature | Design Value |
|---|---|
| Calibrated in Celsius | Eliminates need for Kelvin-to-Celsius offset math or external DAC trimming in firmware |
| Wafer-level trimming | Ensures ±1°C accuracy without post-packaging calibration, reducing BOM and test cost |
| Low self-heating | 60 µA draw limits thermal error to <0.1°C in still air-critical for sealed enclosure measurements |
| Single-supply operation | Functions from 4 V to 30 V with no negative rail-simplifies power design in PLC and HVAC controllers |
| Hermetic-grade stability | ±0.08°C long-term drift after 1000 hours at TMAX supports 10+ year field reliability in industrial gear |
Applications
| Power Supply Thermal Monitoring | Battery Pack Temperature Sensing |
|---|---|
Use Scenario: Real-time die temperature tracking of switching regulators and LDOs in telecom power modules. IC Role / Device Role / Timing Role: Analog front-end temperature sensor providing feedback to thermal shutdown logic and efficiency optimization algorithms. Use Value: ±1°C accuracy over −55°C to +150°C enables precise derating curves and prevents premature shutdown during transient loads. | Use Scenario: Cell-level temperature acquisition in 12S Li-ion battery packs for EV and ESS applications. IC Role / Device Role / Timing Role: Centigrade-scaled analog sensor interfaced to battery management system (BMS) ADC inputs. Use Value: 10 mV/°C output eliminates gain/offset calibration per channel, reducing BMS firmware complexity and production test time. |
| HVAC System Ambient Sensing | Industrial Motor Winding Protection |
Use Scenario: Room and duct temperature measurement in commercial HVAC controllers with 0.1°C resolution requirements. IC Role / Device Role / Timing Role: Primary ambient temperature transducer feeding into microcontroller-based PID loop and display subsystem. Use Value: Low 60 µA quiescent current extends battery life in wireless thermostat nodes; SOIC-8 footprint eases reflow assembly on compact PCBs. | Use Scenario: Embedded winding temperature monitoring in 3-phase AC induction motors for predictive maintenance. IC Role / Device Role / Timing Role: High-reliability analog sensor mounted directly on stator windings to detect thermal runaway conditions. Use Value: −55°C to +150°C rating matches motor insulation class H; 0.1 Ω output impedance ensures immunity to noise in electrically noisy drive cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM35DZ | TO-92 plastic package; identical electrical specs but higher thermal resistance (180°C/W vs 220°C/W for LM35DM) | Suitable for low-power PCB-mounted sensing where through-hole assembly is preferred | Select LM35DZ when manual soldering or prototyping on breadboards is required |
| ADT7320TRZ | Digital SPI output; ±0.25°C accuracy; 3.3 V only; integrated 16-bit ADC and cold-junction compensation | Used in high-precision digital systems requiring calibrated digital output and no external ADC | Choose ADT7320TRZ when system already uses SPI peripherals and demands sub-degree accuracy without analog signal chain design |
Compared with LM35DZ and ADT7320TRZ, the LM35DM offers optimal balance of analog simplicity, wide supply range, and surface-mount manufacturability-making it ideal for cost-sensitive, high-volume industrial controllers where analog integration is preferred over digital interface overhead.
Availability
LM35DM is available at Aetrix Electronics and suitable for power supply thermal monitoring, battery pack temperature sensing, and HVAC system ambient sensing requiring stable component supply across multi-year production cycles.
Supply support for LM35DM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of heritage in precision analog ICs.
The LM35 series was designed specifically for direct Celsius temperature measurement in industrial, automotive, and consumer systems-emphasizing calibration-free operation, wide temperature range, and minimal external components.
FAQ
What is the operating temperature range of the LM35DM?
The LM35DM is rated for continuous operation from −55°C to +150°C. This full-range specification is validated per TI's production testing and applies across the entire supply voltage range (4 V to 30 V). The device maintains ±1°C accuracy across this span without external calibration, making it suitable for under-hood automotive, motor control, and industrial power applications where extreme thermal environments occur.
Does the LM35DM require external calibration or trimming?
No, the LM35DM does not require external calibration or trimming. It achieves ±1°C accuracy over −55°C to +150°C through wafer-level laser trimming and inherent delta-VBE architecture. TI's datasheet confirms that no external components, resistor networks, or firmware offsets are needed to achieve specified accuracy-enabling plug-and-play integration into analog signal chains.
Can the LM35DM drive capacitive loads directly?
The LM35DM can drive up to 50 pF capacitively without instability. For heavier loads (e.g., long cables or ADC input capacitance >50 pF), TI recommends adding a 200 Ω series resistor between VOUT and the load to isolate capacitance. This preserves step response fidelity and avoids oscillation-critical in fast-responding thermal protection circuits using the LM35DM.
What is the output impedance of the LM35DM and why does it matter?
The LM35DM has a typical output impedance of 0.1 Ω at 1 mA load, verified per TI's Electrical Characteristics table. This ultra-low impedance enables direct connection to 12-bit SAR or delta-sigma ADCs without buffer amplifiers-reducing component count, board space, and signal path error in systems like HVAC controllers and power supply monitors using the LM35DM.
Is the LM35DM pin-compatible with other LM35 variants like LM35D or LM35C?
No-the LM35DM (SOIC-8) has a different pinout than the LM35D (TO-220, 3-pin) and LM35C (TO-92, 3-pin). While all share the same functional pins (+VS, VOUT, GND), the LM35DM allocates N.C. to pins 3 and 5–8, whereas 3-pin variants use all terminals. PCB layout and footprint must be redesigned when substituting the LM35DM for any 3-pin variant.
LM35DM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- 0°C ~ 100°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4V ~ 30V
- Resolution:
- 10mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±1.5°C
- Test Condition:
- 25°C
- Operating Temperature:
- 0°C ~ 100°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
LM35DM FAQ
1.How can I place an order for LM35DM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM35DM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM35DM reliable?
The price and inventory of LM35DM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM35DM is usually 5 days.
3.What payment methods are accepted for LM35DM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM35DM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM35DM?
LM35DM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM35DM order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM35DM?
For technical support, including LM35DM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM35DM requirements.
6.How does Aetrix verify that LM35DM is sourced from the original manufacturer or authorized distributors?
All LM35DM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM35DM meets industry standards.
7.What is the process for return or replacement of LM35DM?
All LM35DM units undergo pre-shipment inspection (PSI). If there is an issue with LM35DM, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM35DM part is unused and in its original packaging.
Return procedure for LM35DM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM35DM Tags
-
MCP9700T-E/TT
Microchip Technology
-
MCP9700T-E/LT
Microchip Technology
-
MCP9701T-E/TT
Microchip Technology
-
MCP9701T-E/LT
Microchip Technology
-
TMP235A4DBZR
Texas Instruments
-
MCP9700AT-E/TT
Microchip Technology
-
MCP9700AT-E/LT
Microchip Technology
-
MCP9701AT-E/LT
Microchip Technology
-
MCP9701AT-E/TT
Microchip Technology
,TO-226_straightlead.jpg)
-
LM335Z
STMicroelectronics
-
TMP1075NDRLR
Texas Instruments
-
TMP1075DGKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
