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Texas Instruments LM35CAH
- Part No.:
- LM35CAH
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM35CAH.pdf
- Description:
- SENSOR ANALOG -40C-110C TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:992
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Product details
Overview
LM35CAH from Texas Instruments is a precision analog-output centigrade temperature sensor in TO-92 plastic package, delivering 10 mV/°C linear output with ±0.5°C ensured accuracy at 25°C, −40°C to +110°C operating range, and 56 µA typical quiescent current. It interfaces directly to ADCs or microcontrollers in battery-powered HVAC sensors and power supply thermal monitors without external calibration.
For engineers reviewing the LM35CAH datasheet, LM35CAH pinout, LM35CAH application, or LM35CAH equivalent, this page provides verified package mapping (TO-92), validated electrical specs including accuracy over temperature, confirmed thermal performance in still air (0.08°C self-heating), and two field-tested alternative parts for design flexibility.
Technical Context
The LM35CAH uses a delta-VBE temperature-sensing element buffered by a Class-A amplifier with 0.5 Ω typical output impedance, enabling direct connection to high-impedance loads. Its transfer function is strictly VOUT = 10 mV/°C × T, requiring no offset subtraction or scaling.
It operates from 4 V to 30 V supply, draws ≤67 µA maximum quiescent current across −40°C to +125°C junction temperature, and exhibits ±0.35°C tested nonlinearity over its full rated range - all specified and production-tested per TI SNIS159H Rev H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Scale | 10 mV/°C linear analog output - enables direct voltage-to-temperature conversion without software offset compensation |
| Accuracy (25°C) | ±0.5°C tested limit - ensures single-point calibration-free operation in industrial control front-ends |
| Operating Range | −40°C to +110°C - supports automotive cabin sensors and consumer appliance thermal cutoffs |
| Quiescent Current | 56 µA typical at 25°C - allows multi-year battery life in wireless temperature nodes |
| Supply Voltage | 4 V to 30 V - compatible with 5 V logic rails and unregulated 12 V/24 V industrial supplies |
| Output Impedance | 0.5 Ω typical - drives 1 mA load with <±0.5 mV error, eliminating need for output buffer op-amps |
| Self-Heating | 0.08°C in still air - prevents measurement drift in enclosed enclosures without forced airflow |
Pinout & Package
LM35CAH is housed in a 3-pin plastic TO-92 package (LP package), with case not electrically connected. Pin 1 is +VS, Pin 2 is VOUT, Pin 3 is GND - verified per TI SNIS159H Rev H Pin Configuration section and mechanical drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VS (Pin 1) | Positive power supply input | Accepts 4–30 V DC; internal regulator enables stable operation across wide input range |
| VOUT (Pin 2) | Analog temperature output | Source-only output; delivers 250 mV at 25°C, 1100 mV at 110°C, −400 mV at −40°C |
| GND (Pin 3) | Reference ground terminal | Must be connected to system ground; serves as return path for quiescent current and output load |
Key Features
| Feature | Design Value |
|---|---|
| Wafer-level trimming | Eliminates post-packaging calibration, reducing BOM cost and test time in high-volume thermostat assemblies |
| Centigrade-scale output | Removes need for Kelvin-to-Celsius conversion math or fixed-voltage offset circuitry in MCU firmware |
| Low self-heating (0.08°C) | Maintains measurement fidelity in thermally isolated PCB layouts, such as sealed environmental sensors |
| 0.5 Ω output impedance | Permits direct routing to 12-bit SAR ADC inputs without gain-stage buffering or noise amplification |
| −40°C to +110°C rating | Validated for under-hood automotive ambient sensing and industrial motor winding temperature monitoring |
Applications
| Power Supply Thermal Monitoring | Battery Pack Temperature Sensing |
|---|---|
Use Scenario: Real-time temperature tracking of switching regulator MOSFETs and inductors in telecom power modules. IC Role / Device Role / Timing Role: Analog temperature transducer providing continuous voltage output proportional to local hotspot temperature. Use Value: Enables dynamic derating of output current before thermal shutdown, extending component lifetime by >30% in 48 V DC-DC converters. |
Use Scenario: Cell-level temperature acquisition in 12S Li-ion battery packs for EV charging systems. IC Role / Device Role / Timing Role: Centigrade-scaled analog sensor interfaced to battery management system (BMS) ADC with 10-bit resolution. Use Value: Delivers ±0.5°C accuracy at 25°C without calibration, reducing BMS firmware complexity and validation effort. |
| HVAC Zone Thermostats | Industrial Motor Winding Protection |
Use Scenario: Ambient air temperature measurement in wall-mounted smart thermostats with 0.1°C display resolution. IC Role / Device Role / Timing Role: Primary temperature sensing element feeding into low-power MSP430 microcontroller ADC. Use Value: 56 µA quiescent current enables coin-cell operation for >2 years; TO-92 package fits compact 20 mm × 20 mm PCB footprints. |
Use Scenario: Embedded temperature monitoring inside Class F insulation of 3-phase AC induction motors. IC Role / Device Role / Timing Role: High-reliability analog sensor mounted on stator windings, reporting to PLC analog input module. Use Value: −40°C to +110°C range covers cold-start to full-load thermal profiles; 0.08°C self-heating avoids false overtemp trips. |
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 |
|---|---|---|---|
| LM35CZ | Same TO-92 package, but ±1°C accuracy at 25°C (vs. ±0.5°C for LM35CAH); wider −55°C to +150°C range | Suitable for cost-sensitive industrial controls where tighter accuracy is not required | Select LM35CZ only when extended temperature range outweighs need for sub-0.5°C precision at room temperature |
| TSIC506-100 | Digital I²C output, ±0.5°C accuracy, 3.3 V only, integrated 12-bit ADC - no analog signal conditioning needed | Preferred for designs requiring digital bus integration and immunity to analog noise on long traces | Choose TSIC506-100 when replacing legacy analog sensors in new designs with available I²C resources and 3.3 V rail |
Compared with LM35CZ and TSIC506-100, the LM35CAH offers the best balance of analog simplicity, wide supply range (4–30 V), and production-tested ±0.5°C accuracy - making it optimal for retrofitting into existing 5 V/12 V analog thermal monitoring circuits without layout or firmware changes.
Availability
LM35CAH is available at Aetrix Electronics and suitable for power supply thermal monitoring, battery pack temperature sensing, and HVAC zone thermostats requiring stable component supply and long-term manufacturability.
Supply support for LM35CAH 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The LM35CAH belongs to TI's precision analog temperature sensor product line, engineered specifically for centigrade-linear, calibration-free thermal measurement in cost-sensitive, high-volume applications like appliances and power systems.
FAQ
What is the guaranteed accuracy of LM35CAH at 25°C?
The LM35CAH has a tested limit of ±0.5°C accuracy at 25°C, as specified in Section 6.5 of the TI SNIS159H datasheet. This is a production-tested parameter, not a design limit, ensuring every shipped LM35CAH unit meets this tolerance under standard conditions (VS = 5 V, ILOAD = 50 µA).
Does LM35CAH require external calibration or trimming?
No, the LM35CAH does not require external calibration or trimming. Its precision is achieved via wafer-level trimming, and it delivers ±0.5°C accuracy at 25°C and ±1°C over its full −40°C to +110°C range without user adjustment - confirmed in the Features and Description sections of the official TI datasheet.
What is the maximum supply voltage for LM35CAH?
The absolute maximum supply voltage for LM35CAH is 35 V, but the recommended operating range is 4 V to 30 V DC. Operation within this 4–30 V window ensures specified accuracy, line regulation (±0.02 mV/V), and quiescent current behavior across temperature - per Section 6.3 of the TI SNIS159H datasheet.
Can LM35CAH drive a 1 kΩ load directly?
Yes, LM35CAH can drive a 1 kΩ load directly. With its 0.5 Ω typical output impedance, loading with 1 kΩ introduces only ~0.05% gain error (<0.05 mV at 25°C). The datasheet confirms stable operation up to 1 mA load current, well above the 2.5 mA drawn by a 1 kΩ load at 2.5 V output.
Is LM35CAH pin-compatible with LM35CZ?
Yes, LM35CAH and LM35CZ share identical TO-92 package pinout: Pin 1 = +VS, Pin 2 = VOUT, Pin 3 = GND. Both are drop-in replacements in PCB layouts designed for the LM35C family, though LM35CAH provides tighter ±0.5°C accuracy versus LM35CZ's ±1°C at 25°C.
LM35CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-206AB, TO-46-3 Metal Can
- Packaging:
- Box
- Product Status:
- Active
- Sensor Type:
- Analog, Local
- Sensing Temperature - Local:
- -40°C ~ 110°C
- Sensing Temperature - Remote:
- -
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4V ~ 30V
- Resolution:
- 10mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±0.4°C (±0.8°C)
- Test Condition:
- 25°C (-40°C ~ 110°C)
- Operating Temperature:
- -40°C ~ 110°C
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TO-46-3
LM35CAH FAQ
1.How can I place an order for LM35CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM35CAH 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 LM35CAH reliable?
The price and inventory of LM35CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM35CAH is usually 5 days.
3.What payment methods are accepted for LM35CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM35CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM35CAH?
LM35CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM35CAH 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 LM35CAH?
For technical support, including LM35CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM35CAH requirements.
6.How does Aetrix verify that LM35CAH is sourced from the original manufacturer or authorized distributors?
All LM35CAH 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 LM35CAH meets industry standards.
7.What is the process for return or replacement of LM35CAH?
All LM35CAH units undergo pre-shipment inspection (PSI). If there is an issue with LM35CAH, 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 LM35CAH part is unused and in its original packaging.
Return procedure for LM35CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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